WO2013016336A2 - Earpiece passive noise attenuating - Google Patents

Earpiece passive noise attenuating Download PDF

Info

Publication number
WO2013016336A2
WO2013016336A2 PCT/US2012/047975 US2012047975W WO2013016336A2 WO 2013016336 A2 WO2013016336 A2 WO 2013016336A2 US 2012047975 W US2012047975 W US 2012047975W WO 2013016336 A2 WO2013016336 A2 WO 2013016336A2
Authority
WO
WIPO (PCT)
Prior art keywords
eartip
earpiece
conical structure
ear
positioning
Prior art date
Application number
PCT/US2012/047975
Other languages
French (fr)
Other versions
WO2013016336A3 (en
Inventor
Michael Monahan
Ryan C. Silvestri
Eric M. Wallace
Kevin P. Annunziato
Original Assignee
Bose Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=46601937&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2013016336(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bose Corporation filed Critical Bose Corporation
Priority to JP2014522941A priority Critical patent/JP5934358B2/en
Priority to EP21154253.5A priority patent/EP3852386A1/en
Priority to EP12741458.9A priority patent/EP2737720B1/en
Priority to CN201280037522.8A priority patent/CN103733640A/en
Publication of WO2013016336A2 publication Critical patent/WO2013016336A2/en
Publication of WO2013016336A3 publication Critical patent/WO2013016336A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1016—Earpieces of the intra-aural type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
    • A61F11/06—Protective devices for the ears
    • A61F11/08—Protective devices for the ears internal, e.g. earplugs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1058—Manufacture or assembly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/105—Earpiece supports, e.g. ear hooks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/02—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception adapted to be supported entirely by ear
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/652—Ear tips; Ear moulds
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/652—Ear tips; Ear moulds
    • H04R25/654—Ear wax retarders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/652—Ear tips; Ear moulds
    • H04R25/656—Non-customized, universal ear tips, i.e. ear tips which are not specifically adapted to the size or shape of the ear or ear canal

Definitions

  • This specification describes a structure for providing passive noise attenuation by an in-ear earpiece and for positioning and retaining the earpiece in the ear.
  • an in-ear earpiece includes an acoustic driver; an acoustic passage to conduct sound waves radiated by the acoustic driver to an ear canal of a user; a positioning and retaining structure to engage features of the lateral surface of an ear of the user to position the earpiece and to hold the earpiece in place without any structure external to the earpiece; and a substantially conical structure configured so that the smaller end of the conical structure is smaller than the entrance to an ear canal of a user and so that the larger end of the conical structure is larger than the entrance to the ear canal of the user, formed of material that conforms to the entrance to the ear canal to seal the ear canal.
  • the material may have a hardness of 30 Shore A or less.
  • the material may have a modulus of 2 gf/mm or less.
  • the material may be silicone rubber.
  • the material may be a thermoplastic elastomer.
  • the material may be a thermoplastic polyurethane.
  • the positioning and retaining structure may include a first leg and a second leg attached to each other at an attachment end to form a tip and attached to a body of the earpiece at the other end.
  • the positioning and retaining structure may provide at least three modes for preventing clockwise rotation of the earpiece past a rotational position.
  • the modes may include an extremity of the tip contacting the base of the helix; the extremity of the tip becoming wedged under the anti-helix in the cymba concha region; and the inner leg contacting the base of the helix.
  • the positioning and retaining structure may include an inner leg and an outer leg. The inner leg and the outer leg may be attached at an attachment end to the body and attached at a joined end to each other. With the earpiece in its intended position, the outer leg may be urged against the anti-helix at the rear of the concha, the body engages the ear canal; and at least one of the tip is under the anti-helix; or a portion of at least one of the body and the outer leg are under the anti-tragus.
  • the positioning and retaining structure may include an inner leg and an outer leg attached at attachment end to each other and at a second end to an earpiece body.
  • the inner leg and outer leg may be arranged to provide at least three modes for preventing clockwise rotation of the earpieces.
  • the modes may include the tip contacts the base of the helix; the tip becomes wedged under the anti-helix; and the inner leg contacts the base of the helix.
  • the inner leg and the outer leg may be further arranged so that with the earpiece in its intended position, the outer leg is urged against the anti-helix at the rear of the concha, the body engages the ear canal; and at least one of the tip is under the anti-helix; or a portion of at least one of the body and the outer leg are under the anti-tragus.
  • the substantially conical structure may include an opening therethrough to conduct sound waves from the acoustic driver to the ear canal.
  • the opening may be substantially elliptical in cross-section.
  • the substantially conical structure may taper substantially linearly from the large end to the small end.
  • the substantially conical structure may have a substantially uniform thickness.
  • the material of the positioning and retaining structure of the user may have a different hardness than the substantially conical structure.
  • the material of the structure to conduct sound waves radiated by the acoustic driver to an ear canal of a user may have a different hardness than the material of the positioning and retaining structure of the user and than the material of the substantially conical structure.
  • an eartip for an in-ear earpiece includes positioning and retaining structure to engage features of the lateral surface of an ear to position the earpiece and to hold the earpiece in place without any structure external to the earpiece and a substantially conical structure configured so that the smaller end of the conical structure is smaller than the entrance to an ear canal of a user and so that the larger end of the conical structure is larger than the entrance to the ear canal of the user, formed of material that conforms to the entrance to the ear canal to seal the ear canal.
  • the positioning and retaining structure and the substantially conical structure may include the same material.
  • the positioning and retaining structure and the substantially conical structure may be a unitary structure.
  • FIG. 1A is a view of the lateral surface of the human ear
  • FIG. IB and 1C are exemplary cross-sections of the human ear
  • FIG. 2 is an isometric view of an earpiece
  • FIG. 3 is a lateral view of an earpiece and a human ear
  • FIG. 4 shows cross-sections of two exemplary human ears
  • FIGs. 5A - 5D are views of an earpiece
  • Fig. 6 shows cross-sections of two exemplary human ears
  • Figs. 7 A - 7C are views of a portion of the earpiece of Figs. 2 and 5A - 5D;
  • Figs. 8A and 8B are cross-sections of the earpiece portions of Figs. 7A - 7C;
  • FIGs. 9A - 9C are views of an alternative embodiment of the earpiece.
  • FIG. 1A shows the lateral surface of a human right ear, with some features identified. There are many different ear sizes and geometries. Some ears have additional features that are not shown in Fig. 1A. Some ears lack some of the features that are shown in Fig. 1A. Some features may be more or less prominent than are shown in Fig. 1A.
  • Figs. IB and 1C show two exemplary cross-sections of the human ear, with some features identified.
  • the ear canal is an irregularly shaped cylinder with a variable cross sectional area and a centerline that is not straight.
  • the entrance to the ear canal and the main portion of the ear canal refers to the portion of the ear canal near the concha where the walls of the ear canal are substantially non parallel to the centerline of the ear canal.
  • the precise structure of the human ear varies widely from individual to individual. For example, in the cross section of Fig.
  • Fig. 2 shows an earpiece 10.
  • the earpiece 10 may include a stem 52 for positioning cabling and the like, an acoustic driver module 14, and a tip 60 (more clearly identified in Figs. 5A - 5D).
  • Some earpieces may lack the stem 52 but may include electronics modules (not shown) for wireless communicating with external devices.
  • Other earpieces may lack the stem and the acoustic driver module and may function as passive earplugs.
  • the tip 60 includes a positioning and retaining structure 20, which in this example includes an outer leg 22 and an inner leg 24.
  • the tip also includes a sealing structure 48.
  • the earpiece 10 is placed in the ear and is oriented and held in place by positioning and retaining structure 20 and other portions of the earpiece.
  • the tip 60 includes a passageway to conduct sound waves radiated by an acoustic driver in the acoustic driver module 14 to the ear canal. Extending from the tip 60 is the positioning and retaining structure 20 that holds the earpiece in position, without significant contribution from the portions of the eartip that engage the ear canal and without any structure external to the eartip.
  • the positioning and retaining structure 20 includes at least an outer leg 22 and an inner leg 24 that are joined to other portions of the eartip at one end and are joined to each other at the other end.
  • the outer leg is curved to generally follow the curve of the anti-helix and/or the cymba concha at the rear of the concha. In general, the
  • the outer leg 22 and inner leg 24 may lie in a plane.
  • the earpiece tip is placed in the ear and pushed gently inward and preferably rotated counter-clockwise as indicated by arrow 43. Pushing the body into the ear causes the outer leg 22 to seat in position underneath the anti-helix, and causes the outlet section of the tip 48 (for convenience, not shown in this view) to enter the ear canal by a small amount, depending on the dimensions and geometry of the entrance to the ear canal.
  • the body is then rotated clockwise as indicated by arrow 41 until a condition occurs so that the body cannot be further rotated.
  • the conditions could include: the extremity 35 of the tip may contact the base of the helix; inner leg 24 may contact the base of the helix; or the extremity 35 may become wedged behind the anti-helix in the cymba concha region.
  • modes all three conditions
  • not all three conditions will happen for all users, but at least one of the modes will occur for most users. Which condition(s) occur(s) is dependent on the size and geometry of the user's ears.
  • Rotating the earpiece clockwise also causes the extremity and outer leg to engage the cymba concha region and seat beneath the anti-helix.
  • the positioning and retaining structure and/or body contact the ear of most people in at least two, and in many people more, of several ways: a length 40 of the outer leg 22 contacts the anti-helix at the rear of the concha; the extremity 35 of the positioning and retaining structure 20 is underneath the anti-helix; portions of the outer leg 22 or tip 60 (of previous figures) or both are underneath the anti-tragus; and the tip 60 contacts at the entrance to the ear canal under the tragus.
  • the two or more points of contact hold the earpiece in position, providing greater stability.
  • the distributing of the force, and the compliance of the portions of the body and the outer leg that contact the ear lessens pressure on the ear, providing a more comfortable fit.
  • One apparatus for providing significant passive attenuation is a structure (for example a "Christmas tree" structure, as described in U.S. Pat. App.
  • a "mushroom” structure as described by U.S. Pat. 5,957,136, or disk shaped flanges, such as described in U.S. Pat. 6,129,175, or similar structures) that fit in the main portion of the ear canal and seals to the ear canal itself by exerting radial pressure on the walls of the main portion of the ear canal, as indicated by arrows 70, 72, and 74 of Fig. 4.
  • the radial pressure may result from, or be supplemented by, inward clamping pressure.
  • This apparatus may have some undesirable side effects, such as poor sealing, discomfort, or even pain, because the geometry and size of ear canals vary widely from individual to individual and because the apparatus may intrude farther into the ear canal than desired in some individuals.
  • the main portion of the ear canal, particularly close to the middle ear, is very sensitive, so the farther the structure extends into the ear, the more uncomfortable it is likely to be.
  • Another apparatus for providing significant passive attenuation is structure, apart from the earpiece itself, that provides inward clamping pressure that urges a conformable structure against the side of the head or the side of the ear. Examples include headbands of conventional headphones and yokes of stethoscopes, for example as described in U.S. Pat. 4,055,233. However, for in-the-ear earpieces, light weight and small size are desirable features, and headbands and yokes add weight and structure.
  • the earpiece of Fig. 2 includes a tip that provides orientation, stability, and good sealing to the entrance to the ear canal and to ear structure outside the ear canal, without excessive radial pressure, and without inward clamping pressure provided by a source not included in the earpiece.
  • Figs. 5A - 5D shows several views of the tip 60. Not all elements of the tip 60 are identified in all of the views.
  • the tip 60 includes positioning and retaining structure 20, a body 23, a passageway 21, and sealing structure 48.
  • the body includes a mating surface 25 for connecting to the driver module 14.
  • the sealing structure 48 comprises a frusto-conical structure.
  • the frusto-conical structure may have an elliptical or oval cross section (as viewed in Fig. 7A below), with walls that taper (as viewed in Figs. 7B, 8A and 8B below) substantially linearly.
  • the structure of the sealing structure and the material from which it is made cause the modulus, when measured in the direction of the arrow 34 of Fig. 5B is in the range of 0.2 to 2 gf/mm. Examples of appropriate materials include silicones, TPUs (thermoplastic polyurethanes) and TPEs (thermoplastic elastomers).
  • the smaller end 62 of the tip is dimensioned so that it fits inside the ear canal of most users by a small amount and so that the sealing structure 48 contacts the entrance to the ear canal but does not contact the inside of the ear canal.
  • the larger end 64 of the tip is dimensioned so that it is larger than the entrance to the ear canal of most users.
  • the positioning and retaining structure 20 and the sealing structure 48 may be a single piece, made of the same material, for example a very soft silicone rubber, with a hardness of 30 Shore A or less.
  • the walls of the sealing structure 48 may be of a uniform thickness which may be very thin, for example, less than one mm at the thickest part of the wall and may taper to the base of the frusto-conical structure so that the walls deflect easily, thereby conforming easily to the contours of the ear and providing a good seal and good passive attenuation without exerting significant radial pressure on the ear canal. .
  • hardness (durometer) of the retaining structure 20 may be selected for comfort (for example 12 Shore A), the hardness of the tip 48 may be slightly higher (for example 20 Shore A) for better fit and seal, and the hardness of the part of the eartip that mechanically couples the eartip to the acoustic module 14 may be higher (for example 70 Shore A) for better retention and seal to the part of the eartip that mechanically couples the eartip to the acoustic module 14 and in some instances so that the passage through which sound waves travel has a more consistent shape and dimensions .
  • FIG. 5A - 5D An eartip according to Figs. 5A - 5D seals to the entrance of the ear canal to provide passive attenuation and exerts little radial pressure against the main portion of the ear canal, or does not contact the main portion of the ear canal at all, as shown in Fig. 6
  • Figs. 7A - 7C show external views and Figs. 8A and 8B show cross-sectional views, of the tip 60, with dimensions from a typical embodiment.
  • the sealing structure 48 is elliptical, with a major axis of 7.69 mm and a minor axis of 5.83 mm at the smaller end, and a maior axis of 16.1 mm and a minor axis of 14.2 mm at the larger end.
  • a sealing structure with these dimensions fits into the ear canal of many users so that the smaller end protrudes into the ear canal by a small amount and does not contact the walls of the ear canal, so that the larger end does not fit in the ear canal, and so that the sealing structure 48 engages the entrance to the ear canal.
  • Smaller or larger versions may be used for users with below- or above- averaged-sized ear, including children. Versions with similar overall size but different aspect ratios between major and minor axes may be provided for users with ear canal entrances that are more- or less-circular than average.
  • the sealing structure 48 and the body 23 together are sufficient to position and retain the earpiece in the ear of a user without the need to include the retaining structure 20.
  • Such a design 60' is shown in figures 9A to 9C. Friction and interference between the body 23 and the concha retain the earpiece. Positioning is assisted by the geometrical relationship between the body 23 and the sealing structure 48, such that the body fits into the concha when the sealing structure is correctly positioned at and sealed to the entrance to the ear canal.
  • Adding at least one of the body 23 or the retaining structure 20 (e.g., from figure 2) to the sealing structure 48 relieves the sealing structure from any need to retain the earpiece itself, which allows the sealing structure to be more compliant and deformable that it would need to be if it were also responsible for retention of the earpiece.
  • the generally frustro-conical shape of the sealing structure i.e., its substantially linear sides, combined with its thin wall and elliptical cross-section, allows the sealing structure to be more deformable than prior art sealing structures that tend to have rounded walls, i.e., mushroom-shaped rather than conical.
  • a rounded wall has a greater hoop strength, such that if it is compressed along one transverse axis (that is, an axis perpendicular to the axis through the length of the structure), the structure bulges outward along the perpendicular transverse axis.
  • the wall becomes less compliant along the other transverse axis, such that compression from multiple radial directions may cause buckling along the curve of the wall, leading to gaps in the seal between the sealing structure and the ear, or pressure points where the side wall is unable to compress in all directions.
  • the thin, conical walls of the sealing structure 60 can be compressed in multiple directions simultaneously without buckling or increasing pressure elsewhere.

Abstract

An earpiece with structure for positioning and retaining the earpiece and with structure for sealing against the entrance to the ear canal to provide passive noise attenuation. The positioning and retaining structure engages features of the lateral surface of the ear. The structure for sealing against the entrance to the ear canal includes a conical structure.

Description

EARPIECE PASSIVE NOISE ATTENUATING
BACKGROUND
[0001] This specification describes a structure for providing passive noise attenuation by an in-ear earpiece and for positioning and retaining the earpiece in the ear.
SUMMARY
[0002] In one aspect, an in-ear earpiece includes an acoustic driver; an acoustic passage to conduct sound waves radiated by the acoustic driver to an ear canal of a user; a positioning and retaining structure to engage features of the lateral surface of an ear of the user to position the earpiece and to hold the earpiece in place without any structure external to the earpiece; and a substantially conical structure configured so that the smaller end of the conical structure is smaller than the entrance to an ear canal of a user and so that the larger end of the conical structure is larger than the entrance to the ear canal of the user, formed of material that conforms to the entrance to the ear canal to seal the ear canal. The material may have a hardness of 30 Shore A or less. The material may have a modulus of 2 gf/mm or less. The material may be silicone rubber. The material may be a thermoplastic elastomer. The material may be a thermoplastic polyurethane. The positioning and retaining structure may include a first leg and a second leg attached to each other at an attachment end to form a tip and attached to a body of the earpiece at the other end. The positioning and retaining structure may provide at least three modes for preventing clockwise rotation of the earpiece past a rotational position. The modes may include an extremity of the tip contacting the base of the helix; the extremity of the tip becoming wedged under the anti-helix in the cymba concha region; and the inner leg contacting the base of the helix. The positioning and retaining structure may include an inner leg and an outer leg. The inner leg and the outer leg may be attached at an attachment end to the body and attached at a joined end to each other. With the earpiece in its intended position, the outer leg may be urged against the anti-helix at the rear of the concha, the body engages the ear canal; and at least one of the tip is under the anti-helix; or a portion of at least one of the body and the outer leg are under the anti-tragus. The positioning and retaining structure may include an inner leg and an outer leg attached at attachment end to each other and at a second end to an earpiece body. The inner leg and outer leg may be arranged to provide at least three modes for preventing clockwise rotation of the earpieces. The modes may include the tip contacts the base of the helix; the tip becomes wedged under the anti-helix; and the inner leg contacts the base of the helix. The inner leg and the outer leg may be further arranged so that with the earpiece in its intended position, the outer leg is urged against the anti-helix at the rear of the concha, the body engages the ear canal; and at least one of the tip is under the anti-helix; or a portion of at least one of the body and the outer leg are under the anti-tragus. The substantially conical structure may include an opening therethrough to conduct sound waves from the acoustic driver to the ear canal. The opening may be substantially elliptical in cross-section. The substantially conical structure may taper substantially linearly from the large end to the small end. The substantially conical structure may have a substantially uniform thickness. The material of the positioning and retaining structure of the user may have a different hardness than the substantially conical structure. The material of the structure to conduct sound waves radiated by the acoustic driver to an ear canal of a user may have a different hardness than the material of the positioning and retaining structure of the user and than the material of the substantially conical structure.
[0003] In another aspect, an eartip for an in-ear earpiece includes positioning and retaining structure to engage features of the lateral surface of an ear to position the earpiece and to hold the earpiece in place without any structure external to the earpiece and a substantially conical structure configured so that the smaller end of the conical structure is smaller than the entrance to an ear canal of a user and so that the larger end of the conical structure is larger than the entrance to the ear canal of the user, formed of material that conforms to the entrance to the ear canal to seal the ear canal. The positioning and retaining structure and the substantially conical structure may include the same material. The positioning and retaining structure and the substantially conical structure may be a unitary structure.
[0004] Other features, objects, and advantages will become apparent from the following detailed description, when read in connection with the following drawing, in which:
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
[0005] Fig. 1A is a view of the lateral surface of the human ear;
[0006] Fig. IB and 1C are exemplary cross-sections of the human ear;
[0007] Fig. 2 is an isometric view of an earpiece;
[0008] Fig. 3 is a lateral view of an earpiece and a human ear;
[0009] Fig. 4 shows cross-sections of two exemplary human ears;
[0010] Figs. 5A - 5D are views of an earpiece;
[0011] ]Fig. 6 shows cross-sections of two exemplary human ears;
[0012] Figs. 7 A - 7C are views of a portion of the earpiece of Figs. 2 and 5A - 5D;
[0013] Figs. 8A and 8B are cross-sections of the earpiece portions of Figs. 7A - 7C; and
[0014] Figs. 9A - 9C are views of an alternative embodiment of the earpiece.
DETAILED DESCRIPTION
[0015] This specification describes an in-ear earpiece that is designed to fit in the right ear. An earpiece that is designed to fit in the left ear is a mirror image of the earpiece described below, and operates according to the same principles, and is not described herein. [0016] Fig. 1A shows the lateral surface of a human right ear, with some features identified. There are many different ear sizes and geometries. Some ears have additional features that are not shown in Fig. 1A. Some ears lack some of the features that are shown in Fig. 1A. Some features may be more or less prominent than are shown in Fig. 1A. Figs. IB and 1C show two exemplary cross-sections of the human ear, with some features identified. The ear canal is an irregularly shaped cylinder with a variable cross sectional area and a centerline that is not straight. Among the features identified is the entrance to the ear canal and the main portion of the ear canal. In this specification the entrance to the ear canal refers to the portion of the ear canal near the concha where the walls of the ear canal are substantially non parallel to the centerline of the ear canal. The precise structure of the human ear varies widely from individual to individual. For example, in the cross section of Fig. IB, there is a relatively sharp transition from ear canal walls that are non-parallel to a centerline 30-1B of the ear canal to walls that are substantially parallel to a centerline of the ear canal, so the entrance 32-1B to the ear canal in relatively short. In the cross-second of Fig. 1C, there is a more gradual transition from walls that are non-parallel to a centerline of the ear canal to walls that are substantially parallel to a centerline 30-lC of the ear canal, so the entrance 32-lC to the ear canal is relatively long.
[0017] Fig. 2 shows an earpiece 10. The earpiece 10 may include a stem 52 for positioning cabling and the like, an acoustic driver module 14, and a tip 60 (more clearly identified in Figs. 5A - 5D). Some earpieces may lack the stem 52 but may include electronics modules (not shown) for wireless communicating with external devices. Other earpieces may lack the stem and the acoustic driver module and may function as passive earplugs. The tip 60 includes a positioning and retaining structure 20, which in this example includes an outer leg 22 and an inner leg 24. The tip also includes a sealing structure 48.
[0018] In operation, the earpiece 10 is placed in the ear and is oriented and held in place by positioning and retaining structure 20 and other portions of the earpiece. The tip 60 includes a passageway to conduct sound waves radiated by an acoustic driver in the acoustic driver module 14 to the ear canal. Extending from the tip 60 is the positioning and retaining structure 20 that holds the earpiece in position, without significant contribution from the portions of the eartip that engage the ear canal and without any structure external to the eartip. The positioning and retaining structure 20 includes at least an outer leg 22 and an inner leg 24 that are joined to other portions of the eartip at one end and are joined to each other at the other end. The outer leg is curved to generally follow the curve of the anti-helix and/or the cymba concha at the rear of the concha. In general, the
compliance/stiffness of the entire positioning and retaining structure is more important than the compliance/stiffness of the material from which the positioning and retaining structure is made or the compliance/stiffness of the any one component of the positioning and retaining structure. The outer leg 22 and inner leg 24 may lie in a plane.
[0019] Referring now to Fig. 3, the earpiece tip is placed in the ear and pushed gently inward and preferably rotated counter-clockwise as indicated by arrow 43. Pushing the body into the ear causes the outer leg 22 to seat in position underneath the anti-helix, and causes the outlet section of the tip 48 (for convenience, not shown in this view) to enter the ear canal by a small amount, depending on the dimensions and geometry of the entrance to the ear canal.
[0020] The body is then rotated clockwise as indicated by arrow 41 until a condition occurs so that the body cannot be further rotated. The conditions could include: the extremity 35 of the tip may contact the base of the helix; inner leg 24 may contact the base of the helix; or the extremity 35 may become wedged behind the anti-helix in the cymba concha region. Though the positioning and retaining structure provides all three conditions (hereinafter referred to as "modes)", not all three conditions will happen for all users, but at least one of the modes will occur for most users. Which condition(s) occur(s) is dependent on the size and geometry of the user's ears. [0021] Rotating the earpiece clockwise also causes the extremity and outer leg to engage the cymba concha region and seat beneath the anti-helix. When the body and positioning and retaining structure 20 are in place, the positioning and retaining structure and/or body contact the ear of most people in at least two, and in many people more, of several ways: a length 40 of the outer leg 22 contacts the anti-helix at the rear of the concha; the extremity 35 of the positioning and retaining structure 20 is underneath the anti-helix; portions of the outer leg 22 or tip 60 (of previous figures) or both are underneath the anti-tragus; and the tip 60 contacts at the entrance to the ear canal under the tragus. The two or more points of contact hold the earpiece in position, providing greater stability. The distributing of the force, and the compliance of the portions of the body and the outer leg that contact the ear lessens pressure on the ear, providing a more comfortable fit.
[0022] It is desirable to place the earpiece in the ear so that it is oriented properly, so that it is stable (that is, stays in the ear), so that it is comfortable, and, for some applications so that it provides significant passive attenuation of ambient noise. One way of providing stability and proper orientation is described above and is described more completely in U.S. Pat. App. 12/860,531, incorporated herein by reference in its entirety.
[0023] One apparatus for providing significant passive attenuation is a structure (for example a "Christmas tree" structure, as described in U.S. Pat. App.
2004/0163653, a "mushroom" structure, as described by U.S. Pat. 5,957,136, or disk shaped flanges, such as described in U.S. Pat. 6,129,175, or similar structures) that fit in the main portion of the ear canal and seals to the ear canal itself by exerting radial pressure on the walls of the main portion of the ear canal, as indicated by arrows 70, 72, and 74 of Fig. 4. The radial pressure may result from, or be supplemented by, inward clamping pressure. This apparatus may have some undesirable side effects, such as poor sealing, discomfort, or even pain, because the geometry and size of ear canals vary widely from individual to individual and because the apparatus may intrude farther into the ear canal than desired in some individuals. The main portion of the ear canal, particularly close to the middle ear, is very sensitive, so the farther the structure extends into the ear, the more uncomfortable it is likely to be. Another apparatus for providing significant passive attenuation is structure, apart from the earpiece itself, that provides inward clamping pressure that urges a conformable structure against the side of the head or the side of the ear. Examples include headbands of conventional headphones and yokes of stethoscopes, for example as described in U.S. Pat. 4,055,233. However, for in-the-ear earpieces, light weight and small size are desirable features, and headbands and yokes add weight and structure.
[0024] The earpiece of Fig. 2 includes a tip that provides orientation, stability, and good sealing to the entrance to the ear canal and to ear structure outside the ear canal, without excessive radial pressure, and without inward clamping pressure provided by a source not included in the earpiece.
[0025] Figs. 5A - 5D shows several views of the tip 60. Not all elements of the tip 60 are identified in all of the views. The tip 60 includes positioning and retaining structure 20, a body 23, a passageway 21, and sealing structure 48. The body includes a mating surface 25 for connecting to the driver module 14. The
passageway 21 conducts sound from the driver module, through the body and the sealing structure, and into the ear canal. The sealing structure 48 comprises a frusto-conical structure. The frusto-conical structure may have an elliptical or oval cross section (as viewed in Fig. 7A below), with walls that taper (as viewed in Figs. 7B, 8A and 8B below) substantially linearly. In one implementation, the structure of the sealing structure and the material from which it is made cause the modulus, when measured in the direction of the arrow 34 of Fig. 5B is in the range of 0.2 to 2 gf/mm. Examples of appropriate materials include silicones, TPUs (thermoplastic polyurethanes) and TPEs (thermoplastic elastomers).
[0026] The smaller end 62 of the tip is dimensioned so that it fits inside the ear canal of most users by a small amount and so that the sealing structure 48 contacts the entrance to the ear canal but does not contact the inside of the ear canal. The larger end 64 of the tip is dimensioned so that it is larger than the entrance to the ear canal of most users.
[0027] The positioning and retaining structure 20 and the sealing structure 48 may be a single piece, made of the same material, for example a very soft silicone rubber, with a hardness of 30 Shore A or less. The walls of the sealing structure 48 may be of a uniform thickness which may be very thin, for example, less than one mm at the thickest part of the wall and may taper to the base of the frusto-conical structure so that the walls deflect easily, thereby conforming easily to the contours of the ear and providing a good seal and good passive attenuation without exerting significant radial pressure on the ear canal. . Since the different parts of the earpiece serve different functions, it may be desirable for different portions of the earpiece to be made of different materials, or materials with different hardnesses or moduli. For example, hardness (durometer) of the retaining structure 20 may be selected for comfort (for example 12 Shore A), the hardness of the tip 48 may be slightly higher (for example 20 Shore A) for better fit and seal, and the hardness of the part of the eartip that mechanically couples the eartip to the acoustic module 14 may be higher (for example 70 Shore A) for better retention and seal to the part of the eartip that mechanically couples the eartip to the acoustic module 14 and in some instances so that the passage through which sound waves travel has a more consistent shape and dimensions .
[0028] An eartip according to Figs. 5A - 5D seals to the entrance of the ear canal to provide passive attenuation and exerts little radial pressure against the main portion of the ear canal, or does not contact the main portion of the ear canal at all, as shown in Fig. 6
[0029] Figs. 7A - 7C show external views and Figs. 8A and 8B show cross-sectional views, of the tip 60, with dimensions from a typical embodiment. In the
implementations of Fig. 7A - 7C and 8A and 8B, the sealing structure 48 is elliptical, with a major axis of 7.69 mm and a minor axis of 5.83 mm at the smaller end, and a maior axis of 16.1 mm and a minor axis of 14.2 mm at the larger end. A sealing structure with these dimensions fits into the ear canal of many users so that the smaller end protrudes into the ear canal by a small amount and does not contact the walls of the ear canal, so that the larger end does not fit in the ear canal, and so that the sealing structure 48 engages the entrance to the ear canal. Smaller or larger versions may be used for users with below- or above- averaged-sized ear, including children. Versions with similar overall size but different aspect ratios between major and minor axes may be provided for users with ear canal entrances that are more- or less-circular than average.
[0030] In some examples, the sealing structure 48 and the body 23 together are sufficient to position and retain the earpiece in the ear of a user without the need to include the retaining structure 20. Such a design 60' is shown in figures 9A to 9C. Friction and interference between the body 23 and the concha retain the earpiece. Positioning is assisted by the geometrical relationship between the body 23 and the sealing structure 48, such that the body fits into the concha when the sealing structure is correctly positioned at and sealed to the entrance to the ear canal. Adding at least one of the body 23 or the retaining structure 20 (e.g., from figure 2) to the sealing structure 48 relieves the sealing structure from any need to retain the earpiece itself, which allows the sealing structure to be more compliant and deformable that it would need to be if it were also responsible for retention of the earpiece.
[0031] The generally frustro-conical shape of the sealing structure, i.e., its substantially linear sides, combined with its thin wall and elliptical cross-section, allows the sealing structure to be more deformable than prior art sealing structures that tend to have rounded walls, i.e., mushroom-shaped rather than conical. A rounded wall has a greater hoop strength, such that if it is compressed along one transverse axis (that is, an axis perpendicular to the axis through the length of the structure), the structure bulges outward along the perpendicular transverse axis. Due to that response to deformation on the first transverse axis, the wall becomes less compliant along the other transverse axis, such that compression from multiple radial directions may cause buckling along the curve of the wall, leading to gaps in the seal between the sealing structure and the ear, or pressure points where the side wall is unable to compress in all directions. In contrast, the thin, conical walls of the sealing structure 60 can be compressed in multiple directions simultaneously without buckling or increasing pressure elsewhere.
[0032] Numerous uses of and departures from the specific apparatus and techniques disclosed herein may be made without departing from the inventive concepts. Consequently, the invention is to be construed as embracing each and every novel feature and novel combination of features disclosed herein and limited only by the spirit and scope of the appended claims.

Claims

What is claimed is:
1. An eartip for an in-ear earpiece comprising:
a positioning and retaining structure to engage features of the lateral surface of an ear of a user to position the earpiece and to hold the earpiece in place without any structure external to the earpiece;
a substantially conical structure configured so that the smaller end of the conical structure is smaller than the entrance to an ear canal of a typical human and so that the larger end of the conical structure is larger than the entrance to the ear canal of the typical human, formed of material that conforms to the entrance to the ear canal to seal the ear canal.
2. The eartip of claim 1 further comprising a round body coupled to the conical structure, located near the larger end of the conical structure, config to rest in the concha of the user's ear.
3. The eartip of claim 2, wherein the round body includes an earpiece mating surface for coupling to a housing of an electroacoustic transducer of the earpiece, such that the conical structure and the eartip body are positioned between the user's ear and the housing when the eartip is inserted into the ear of the user.
4. The eartip of claim 2 wherein the eartip body is joined to the conical
structure by a passageway through the interior of the conical structure, ending at the smaller end of the conical structure, a volume of air between the passageway and the wall of the conical structure providing room for the conical structure to deform when inserted into the ear of the user.
5. The eartip of claim 2, wherein the positioning and retaining structure
comprises the round body.
6. The eartip of claim 1 wherein the positioning and retaining structure and the substantially conical structure comprise the same material.
7. The eartip of claim 6, wherein the positioning and retaining structure and the substantially conical structure are a unitary structure.
8. The eartip of claim 1, wherein the positioning and retaining structure
comprises:
an outer leg and an inner leg leg attached to each other at an attachment end to form a tip and attached to a body of the earpiece at the other end.
9. The eartip of claim 1, wherein the substantially conical structure tapers
substantially linearly from the large end to the small end.
10. The eartip of claim 1, wherein the substantially conical structure has a
substantially uniform thickness.
11. The eartip of claim 1, wherein the substantially conical structure is
substantially elliptical in cross-section.
12. The eartip of claim 1, wherein the material of the positioning and retaining structure has a different hardness than the substantially conical structure.
13. The eartip of claim 1, wherein the substantially conical structure has a
compliance and deformability allowing the wall to be compressed along two different transverse axes without buckling.
14. The eartip of claim 1, wherein the material has a hardness of 30 Shore A or less.
15. The eartip of claim 1, wherein the material has a stiffness of 2 gf/mm or less.
16. The eartip of claim 1, wherein the material is silicone rubber.
17. The eartip of claim 1, wherein the material is a thermoplastic elastomer.
18. The eartip of claim 1, wherein the material is a thermoplastic polyurethane.
19. The eartip of claim 1, wherein the substantially conical structure comprises an opening therethrough to conduct sound waves from an acoustic driver of the earpiece to the ear canal.
20. The eartip of claim 19, wherein the material of the structure around the
opening to conduct sound waves radiated by the acoustic driver to the ear canal of the user has a different hardness than the material of the positioning and retaining structure and than the material of the substantially conical structure.
21. The eartip of claim 19, wherein the opening is substantially elliptical in
cross-section.
22. A set of eartips according to claim 21, wherein the openings of at least two eartips of the set have different elliptical eccentricities.
23. The set of eartips according to claim 22, wherein the positioning and
retaining structures of the at least two eartips having openings with different eccentricities have the same dimensions.
24. An in-ear earpiece comprising the eartip of any of claims 1 to 21 and further comprising an acoustic driver coupled to the eartip.
PCT/US2012/047975 2011-07-28 2012-07-24 Earpiece passive noise attenuating WO2013016336A2 (en)

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JP2014522941A JP5934358B2 (en) 2011-07-28 2012-07-24 Earpiece passive noise attenuation
EP21154253.5A EP3852386A1 (en) 2011-07-28 2012-07-24 Eartip for an in-ear earpiece
EP12741458.9A EP2737720B1 (en) 2011-07-28 2012-07-24 Earpiece passive noise attenuating
CN201280037522.8A CN103733640A (en) 2011-07-28 2012-07-24 Earpiece passive noise attenuating

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