WO2004017672A1 - Sound transducer comprising a small rear volume chamber - Google Patents
Sound transducer comprising a small rear volume chamber Download PDFInfo
- Publication number
- WO2004017672A1 WO2004017672A1 PCT/DE2003/002382 DE0302382W WO2004017672A1 WO 2004017672 A1 WO2004017672 A1 WO 2004017672A1 DE 0302382 W DE0302382 W DE 0302382W WO 2004017672 A1 WO2004017672 A1 WO 2004017672A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sound transducer
- membrane
- back volume
- transducer
- volume chamber
- Prior art date
Links
- 239000012528 membrane Substances 0.000 claims abstract description 43
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims description 14
- 230000003068 static effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 7
- 230000009467 reduction Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000009131 signaling function Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
- H04M1/035—Improving the acoustic characteristics by means of constructional features of the housing, e.g. ribs, walls, resonating chambers or cavities
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K13/00—Cones, diaphragms, or the like, for emitting or receiving sound in general
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
-
- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for telephonic receivers
-
- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2803—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
Definitions
- the present invention relates to a playback sound transducer for communication terminals.
- playback sound converters are required for listening, open listening / hands-free speaking and for signaling functions.
- a prerequisite for the miniaturization of the communication terminals is the reduction in the number of components and the miniaturization of each individual component.
- the reduction in the number of components is all the more important if the manufacturing costs are also considered.
- a summary of the wrestler and earpiece functions that are required in every communication terminal), hands-free calling and listening to entertainment functions (eg: radio, MP3 player) is thus an important volume and cost criterion, so that the use of several specialized converters is unfavorable.
- the object of the present invention is therefore to implement a multiple function (earpiece, wrestler, hands-free loudspeaker) with only one sound transducer. Integration should also be made possible in those housing shapes that only provide small, leaky or undefined volumes behind the converter.
- a sound transducer which is characterized by a mechanical transducer structure with a small closed back volume chamber in relation to the transducer, which is an integral part of the function of the sound transducer, the ratio between membrane mass and back volume being chosen such that a predetermined lower limit of a desired transmission range is reached, and the spring stiffness of the membrane clamping is chosen to be so low, that it is significantly below the spring stiffness of the enclosed back volume.
- the required stable frequency characteristic is generated by a back volume chamber which is permanently assigned to the converter.
- the air volume contained therein will be smaller than the total air chambers present in the communication terminal. If conventional converter technology were used, the resulting lower limit frequency of the transmission range would rise into unacceptable ranges.
- the converter according to the invention is already designed for the stably coupled small back volume when it is dimensioned.
- a prerequisite for a suitable adjustment is an extraordinary increase in the membrane mass, as well as a strong reduction in the rigidity of the membrane clamping (see page 4, line 24).
- the air-spring stiffness of the back volume which causes undesired installation effects in known technology, becomes the main component of the mass-spring system in the converter according to the invention.
- the spring stiffness of the diaphragm clamping which is decisive in conventional converters, is replaced in the converter according to the invention by the dominant air spring stiffness of the small converter back volume.
- FIG. 1 shows a schematic cross section through a sound transducer, as is known from the prior art
- FIG. 2 shows a schematic cross section through a sound transducer which is constructed in accordance with the present invention.
- the sensitivity of a playback sound transducer (volume of the emitted sound in relation to the electrical power fed in) is primarily determined by the volume of the membrane. For a high sensitivity, as large a part of the membrane as possible must move with the highest possible amplitude.
- thermoformed film as the membrane material, which due to its contour is rigid in the center (e.g. calotte) and elastic at the edge.
- FIG. 1 Such a conventional converter is shown schematically in FIG. 1.
- the membrane 1, 2 shown consists of a rigid region 1 and an elastic clamping region 2.
- Membrane clamping is understood here to mean the structural property of region 2 of membrane 1, 2, which in the form of a spring function leads to a restoring force in the direction of the membrane resting position.
- the rigid region 1 in the center is dynamically deflected by an electromagnetic coil 3 and a permanent magnet.
- the amplitude of the membrane deflection decreases in the elastic region 2 with increasing diameter. From this, an effective membrane area can be calculated which, with the same volume as the said membrane, would achieve with a radially decreasing deflection.
- the sound pressure levels required for open listening and signaling functions specify a minimum rigidity of the membrane to avoid partial vibrations (interference-free sound reproduction). If a lower lower limit of the transmission frequency range is desired, the rigidity of the clamping must be low and, in the case of one-piece membranes 1, 2, a wide strip must therefore be used for the elastic deformation. As a result, only the relatively small (inner) part of the membrane is deflected at full amplitude, which leads to a small effective membrane area.
- the rapid volume of the diaphragm 1, 2 depends on the movement amplitude at the predetermined frequency in addition to the effective diaphragm area. This, in turn, is proportional to the rigidity of the clamping, as well as being anti-proportional to the mass of the membrane.
- Conventional miniature transducers therefore use the lightest possible membranes 1, 2, which are driven by light coils 3, in order to realize large amplitudes of movement.
- this housing changes the acoustic properties of the transducer.
- the air volume enclosed behind the converter acts as an additional spring stiffness on the membrane. So that the lower limit of the
- FIG. 2 An example of a sound transducer according to the invention, which is shown schematically in FIG. 2, will now be described below.
- the structure of the sound transducer is characterized by the fact that a special transducer concept enables tuning which, despite a small back volume, enables broadband sound reproduction.
- the transducer tuning is characterized by the fact that when the transducer is integrated into a normal back volume, a lower resonance frequency is achieved which is far below the lower limit of the transmission frequency response that is actually aimed for. Only after application of the small closed back volume 8 on the back of the converter, the desired lower limit of the transmission frequency response is set.
- a soft membrane suspension can e.g. B. can be achieved by a two-part membrane.
- a special bending-resistant material cardboard, plastic
- a particularly soft material such as rubber or silicone ⁇ is used.
- the elastic (radially less and less deflected) area can be reduced to a narrow edge and the effective membrane area can be maximized.
- the large effective membrane area initially increases the transducer sensitivity.
- this structure leads to the desired increase in membrane mass.
- the transducer sensitivity is partially reduced.
- this can also be compensated for by large coils 7 and magnet systems. Large coils contribute to a further increase in membrane mass.
- a soft membrane suspension (with a large effective membrane area) can be achieved by multi-layer membrane structures or membrane structures that are greatly stretched at the edge.
- a mechanical transducer structure is used, the tuning of which is primarily determined by the spring stiffness of a small closed air volume 8 on the back of the transducer.
- the back volume 8 which is undersized in comparison to conventional technology, enables the use of a tight back volume chamber which is specifically assigned to the converter.
- the coupled back volume must be largely sealed to prevent the acoustic short circuit.
- the targeted introduction of small acoustically coordinated openings (hole, slot, channel, tube, or the like) with or without damping measures (flow, cotton wool, mechanical constrictions) enables both static pressure equalization (outside ⁇ -> inside) and additional targeted influencing of frequency characteristics and distortion. This creates a small acoustic module that realizes a stable frequency characteristic with a lower lower limit of the transmission range, without placing any demands on the design and tightness of the device volume.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004528378A JP2005534266A (en) | 2002-07-26 | 2003-07-15 | Acoustic transducer with small rear volume chamber |
EP03787671A EP1525774A1 (en) | 2002-07-26 | 2003-07-15 | Sound transducer comprising a small rear volume chamber |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10234169 | 2002-07-26 | ||
DE10234169.9 | 2002-07-26 | ||
DE10328380A DE10328380A1 (en) | 2002-07-26 | 2003-06-24 | Electroacoustic transducer for communications terminal has relatively small enclosed rear volume for allowing increased miniaturization |
DE10328380.3 | 2003-06-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004017672A1 true WO2004017672A1 (en) | 2004-02-26 |
Family
ID=31889083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2003/002382 WO2004017672A1 (en) | 2002-07-26 | 2003-07-15 | Sound transducer comprising a small rear volume chamber |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1525774A1 (en) |
JP (1) | JP2005534266A (en) |
KR (1) | KR20050030212A (en) |
CN (1) | CN1672457A (en) |
WO (1) | WO2004017672A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8215445B2 (en) | 2006-12-08 | 2012-07-10 | Sennheiser Electronic Gmbh & Co. Kg | Electroacoustic transducer |
WO2016174086A1 (en) | 2015-04-30 | 2016-11-03 | Ole Wolff Elektronik A/S | Deep-drawn foil-based miniature diaphragm assembly |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2714134A (en) * | 1951-02-27 | 1955-07-26 | Martin L Touger | Headset receiver |
US3324966A (en) * | 1966-10-12 | 1967-06-13 | Stephen L Heidrich | Electro-acoustic transducers |
US3555206A (en) * | 1967-09-15 | 1971-01-12 | Astatic Corp | Microphone diaphragm assembly |
JPS58166897A (en) * | 1982-03-26 | 1983-10-03 | Matsushita Electric Ind Co Ltd | Receiver |
US5243662A (en) * | 1989-07-06 | 1993-09-07 | Nha A/S | Electrodynamic sound generator for hearing aids |
US5729605A (en) * | 1995-06-19 | 1998-03-17 | Plantronics, Inc. | Headset with user adjustable frequency response |
-
2003
- 2003-07-15 EP EP03787671A patent/EP1525774A1/en not_active Withdrawn
- 2003-07-15 CN CN 03817973 patent/CN1672457A/en active Pending
- 2003-07-15 KR KR1020057001353A patent/KR20050030212A/en not_active Application Discontinuation
- 2003-07-15 JP JP2004528378A patent/JP2005534266A/en active Pending
- 2003-07-15 WO PCT/DE2003/002382 patent/WO2004017672A1/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2714134A (en) * | 1951-02-27 | 1955-07-26 | Martin L Touger | Headset receiver |
US3324966A (en) * | 1966-10-12 | 1967-06-13 | Stephen L Heidrich | Electro-acoustic transducers |
US3555206A (en) * | 1967-09-15 | 1971-01-12 | Astatic Corp | Microphone diaphragm assembly |
JPS58166897A (en) * | 1982-03-26 | 1983-10-03 | Matsushita Electric Ind Co Ltd | Receiver |
US5243662A (en) * | 1989-07-06 | 1993-09-07 | Nha A/S | Electrodynamic sound generator for hearing aids |
US5729605A (en) * | 1995-06-19 | 1998-03-17 | Plantronics, Inc. | Headset with user adjustable frequency response |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 007, no. 292 (E - 219) 27 December 1983 (1983-12-27) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8215445B2 (en) | 2006-12-08 | 2012-07-10 | Sennheiser Electronic Gmbh & Co. Kg | Electroacoustic transducer |
WO2016174086A1 (en) | 2015-04-30 | 2016-11-03 | Ole Wolff Elektronik A/S | Deep-drawn foil-based miniature diaphragm assembly |
Also Published As
Publication number | Publication date |
---|---|
JP2005534266A (en) | 2005-11-10 |
EP1525774A1 (en) | 2005-04-27 |
CN1672457A (en) | 2005-09-21 |
KR20050030212A (en) | 2005-03-29 |
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