WO2011038517A1

WO2011038517A1 - Shielding shell for a mobile cellular telephone

Info

Publication number: WO2011038517A1
Application number: PCT/CH2010/000222
Authority: WO
Inventors: Ralph Bysäth
Original assignee: Bysaeth Ralph
Priority date: 2009-09-30
Filing date: 2010-09-16
Publication date: 2011-04-07
Also published as: CH701912A1

Abstract

The invention relates to a shielding shell for a mobile cellular telephone, which has an antenna, by means of which electromagnetic waves can be emitted, and an operating part, wherein the shielding shell comprises the following components: - an interior for accommodating the cellular telephone, - a front, which has a shielding material for at least partially shielding the electromagnetic waves and which is flexible and substantially transparent so that the operating part of the cellular telephone can be used through the front, - a rear (2), which has a passage area, which is substantially permeable to the electromagnetic waves, and - at least one adaptation area (2-6), which is resilient in order to adapt the dimensions of the interior to the dimensions of the cellular telephone.

Description

Shielding cover for a mobile radio telephone

The present invention relates to a

Shielding cover for a mobile radio telephone according to the preamble of claim 1.

Mobile radiotelephone devices, such as cell phones or cordless phones, are widely used. They have a radio part with an antenna for transmitting and

Serve to receive electromagnetic waves. Such waves are in the high frequency range. In the GSM standard, for example, the frequencies are in the range of 900 MHz, 1800 MHz or 1900 MHz; on the newer UMTS network

Frequencies in the range of 2.4 GHz. When emitting the waves, some of their energy can be deposited in the human body, which u. a. can cause a warming of the tissue. This is especially the case when the radio telephone set in use on the body, for. B. is applied to an ear. Since adverse effects on health can not be excluded, are

Measures known to shield the electromagnetic waves so that they can penetrate only a small amount in the body. From EP 1 732 236 A1 and WO 2008/067570 A2 it is known to provide means for shielding the electromagnetic waves in the housing of the radio telephone set

integrate or arrange in the housing. This measure must already be made during the production of the radio telephone. Retrofitting an existing radio telephone for the purpose of shielding is possible only with great expenditure of time.

From WO 00/13330 AI a shielding shell in the form of a two-part housing made of a solid plastic is known. This is adapted to the design of the radio telephone, so that retrofitting is possible only for a specific radio telephone. An object of the present invention is to provide a

To provide shielding, which at least partially shields the electromagnetic waves and allows retrofitting for different radiotelephone equipment. A shielding shell which achieves this object is specified in claim 1. The other claims give preferred

Executions.

The invention will be described below with reference to a

Embodiment explained with reference to figures. Show it

Fig. 1 is a rear perspective view of a

inventive shielding shell;

Fig. 2 is a front perspective view of

Shielding shell according to FIG. 1;

Fig. 3 is a plan view of the back of the

Shielding shell according to FIG. 1; and

Fig. 4 is a plan view of the front of the

Shielding sheath according to FIG. 1. The shielding sheath shown in FIGS. 1 to 4 has a front side 1 and a rear side 2, which over

Side elements 3 and 4 and a cover element 5 and a bottom element 6 are connected. The front side 1 is made of a shielding material which at least partially absorbs the electromagnetic radiation which is the antenna of a mobile

Radio telephone generated during operation. Likewise, the respective element 3, 4, 5 is completely or at least its edge region, which adjoins the front side 1, from

Shielding material manufactured.

As particularly shown in FIG. 3, the bottom element 6, which is also made of shielding material, pulled up on the back 2 and thus extends over a length L over the lower region of the back 2. The length L is z. In the range of about 1 cm to about 4 cm.

The cover element 5 is hinged to one of the sides 1, 2 or to one of the elements 3, 4 and releasably connected to one of the other side 1, 2 or one of the other elements 3, 4, z. B. by means of Velcro or button closure. The cover element 5 is thus hinged to a radio telephone in the

Insert interior of the shielding shell or from this

to be able to remove. To open and close the

Shielding shell, other variants are conceivable, for. B. a zipper, which is incorporated in one of the elements 3-6.

The front 1 and the elements 3-6 are made together in one piece or they consist of several parts, which are connected to each other by common joining techniques such as gluing or sewing. In a multipart

Design is the composite so that the

Shielding materials of the front side 1 and the elements 3-6 are electrically conductively connected to each other. It is conceivable to reinforce the edges, which are formed by adjacent sides 1, 2 or elements 3-6, by a Reinforcing material, for. B. a fabric material is provided.

The shielding material for the front side 1 and the elements 3-6 is selected so that it achieves a sufficient damping in the frequency range in which the electromagnetic waves generated by the antenna of the radio telephone set are. This frequency range is typically

within the range of 200 MHz to 20 GHz. The selected attenuation is typically at least 10 dB and

preferably at least 20 dB, which corresponds to a throughput of 10% or 1%.

As a shielding u. a. Shielding foil, Abschirmstoff or a combination thereof suitable.

Common shielding foils have a thickness that is less than 0.5 mm, z. B. is about 0, 1 mm, and z. B. provided with a noble metal alloy and / or have a metal fabric arranged between two layers.

Common Abschirmstoff consists of a fine fabric which is made of threads of a silver-polyamide mixture or other electrically conductive material. Preferably, a tissue is selected, which consists of

elastic threads of electrically conductive material

is constructed. Such fabrics are z. B. known to

Production of functional textiles with shielding effect. Preferably, the Abschirmstoff consists of a layer of crossed threads and has a thickness which is less than 0.5 mm, z. B. at about 0.1 mm. The mesh size of the fabric determines the degree to which electromagnetic waves of a particular wavelength are and are attenuated

typically less than 1 mm, e.g. B. selected at 0.5 mm. The shield can be up to 50 dB at 10 GHz.

Further properties of the shielding material are:

breathable, transparent, antistatic, antibacterial, washable, foldable, bendable.

The radio telephone is inserted so that its

Front side, on which the control panel (keyboard and

Display) and speakers and microphone are arranged to come under the front side 1 of the shielding. The back of the radio telephone set, which faces the radio part (antenna and transmitter / receiver) is then facing the rear side 2 of the shielding shell. In Fig. 3, the dashed rectangle 8 indicates the area where the antenna of the radio part may come to rest. Depending on the type of

Radio telephone can range from 8 to

Cover element 5, side element 3 and / or side element 4 extend. In Fig. 4, the dashed rectangle 9 indicates the area within which the display of the operating part comes to rest. To make it easier for the user to identify how the radio telephone is to be inserted in relation to the two sides 1 and 2 in the shield shell to z. B. to prevent the radio part comes to rest on the front side 1, the outer and / or inner sides of the shield shell are optionally provided with markings with appropriate symbols, labels or the like.

The front side 1 has a flexibility due to its small thickness, which allows the user to

Using the control panel through the front 1 therethrough.

Furthermore, the front side 1 is largely

designed to be sound permeable, allowing the microphone and

Speaker of the radio telephone is used, and is largely transparent to visible light, so that the display ("Display") is readable. Shielding fabric as Material used for the front, so it can be in

Interplay of reticulated fabric with the ad to get a moire effect. To prevent or at least reduce this, the shielding fabric is so

arranged so that its threads are rotated at an angle α with respect to the direction in which the pixels of the display extend (see Fig. 4). The angle et, at which the moiré effect is the least disturbing depends u. a. from the selected mesh size of Abschirmstoffes and the size of the pixels of the display.

The rear side 2 has a passage area in the form of a stretchable back part 2 a, which is made of a material that is suitable for the antenna of the

Radiotelephone emitted electromagnetic waves is largely transparent. As material own common materials such as stretchable textile, stretch leather, elastic plastic, etc. The back part 2a is using common joining techniques such as bonding, sewing,

Heat treatment, etc. connected to the adjacent elements 3-6. It is conceivable to design the back part 2 a at least partially open by z. B. a cutout in the form of a material-free recess is provided, which contains the area 8 for the antenna and which thus acts as a passband. Such a cutout can be dimensioned such that a radio telephone set can be inserted through the interior of the shielding shell or can be removed from the interior through it. As shown particularly in FIG. 3, 2a is on the back part

Antenna element 7 is arranged. This forms a passive antenna ("booster"), which the reception of

electromagnetic waves through the radio part of the

Radio telephone improved. The antenna is z. B.

made separately and attached to the back of 2a or made directly by spraying metal onto the back part 2a.

The antenna element 7 is arranged so that it is not too close to the elements 5 and 6. On the one hand, it is arranged so that it does not touch the bottom element 6 and is spaced from it by about 1 cm or more. On the other hand, it is located below the area 8 in which the antenna of the radio telephone set comes to rest when it is inserted in the shield shell (see Fig. 3, in which the area 8 is located in the upper half of the back part 2a, while the Antenna element 7 in the lower

Half of the back part 2a is arranged). Unless already mentioned, the shielding sheath described here offers various advantages:

A radiotelephone can be retrofitted in a simple manner with a shield of the electromagnetic waves generated by the antenna by being in the

Shielding is inserted. In particular, at

Telephoning the shielding front 1 facing the user's ear, so that the electromagnetic waves can not practically penetrate into the user's head. By pulling up the shielding bottom element 6 on the back 2 of the shielding shell, the shielding to the genital area is fundamentally improved when the

Radio telephone set is located in a trouser pocket.

On the one hand seeks z. As a cell phone in your pocket, even in standby mode permanently the antenna contact to a

Transmitter, z. B. GSM or UMTS transmitter, and is therefore also without a phone call periodically, and on the other hand, the bottom element 6 in particular also shields when the radio telephone is stowed in the pocket and a headset ("headset") used to make phone calls becomes. Due to the permeable design of the back 2 reception and emission of the electromagnetic waves are not affected. The specific absorption rate ("SAR value") is a measure of the absorption of electromagnetic fields in biological tissue. The smaller the SAR value, the lower the tissue is heated by the radiation. When using the shielding sheath described here, the specific absorption rate ("SAR value" according to European standard EN 50361) can be reduced by at least 80%.

A flexible, transparent and sound-permeable

Design of the front 1 allows the

Radiotelephone largely synonymous with attached

Shielding cover to use.

The provision of one or more elastic fitting regions on the sides 1, 2 and / or on the elements 3-6

ensures that the dimensions of the interior of the

Shielding can be adapted to the dimensions of the radio telephone.

The provision of an antenna element 7 improves the reception of the electromagnetic waves by the radio part of the

Radio telephone.

The shielding shell can be used for mobile radio telephone sets of all kinds, for example mobile phones, smartphones, baby monitors, cordless telephones such as DECT telephones, etc.

From the foregoing description, numerous modifications will be apparent to those skilled in the art without departing from the scope of the invention as defined by the claims

is defined. For example, it is conceivable to provide the shielding shell with holding functions, such as bands, clips, etc., in order to be able to attach them to the body of the user together with the inserted radio telephone.

Is the front 1 a shielding than

Use shielding material, the areas where the openings of the speaker and microphone come to rest, be provided with openings to increase the sound transmission. The diameter of the openings is chosen so that it corresponds at most to the mesh size, which has a suitable Abschirmstoff.

Claims

claims

A shielding sheath for a mobile radiotelephone, comprising an antenna, by means of which electromagnetic waves can be emitted, and a control unit comprising

an interior for accommodating the radio telephone, a front side (1), which has a shielding material for at least partial shielding of the

electromagnetic waves, and

a back side (2) which has a passage region (2a) which is largely permeable to the electromagnetic waves,

characterized by at least one fitting region (1-6) which is elastic in order to adapt the dimensions of the interior space to the dimensions of the radio telephone set, the front side (1) being flexible and largely transparent to the operating part of the radio telephone

Radio telephone through the front (1) to be able to use.

2. shielding shell according to claim 1, wherein the

Passage region (2a) is elastic to form the fitting region.

3. Shielding sheath according to one of the preceding claims, in which the rear side (2) has a shielding area (6) made of shielding material for at least partial shielding of the electromagnetic waves, wherein the

Shielding region (6) is electrically conductively connected to the front side (1) and / or between the passage region (2a) and the bottom of the shielding shell is arranged.

4. shielding shell according to claim 3, wherein the width of the shielding region (6) substantially the width of Back (2) corresponds and the length (L) is at least 1 cm, preferably at least 2 cm.

5. Shielding hull according to one of the preceding claims, wherein the shielding material contains a Abschirmstoff and / or a shielding film.

The shielding sheath of claim 5, wherein the shielding fabric is resilient to form the fitting region.

7. Shielding sheath according to one of claims 5 to 6, wherein the Abschirmstoff comprises a network of threads which at an angle (a) to the longitudinal and transverse directions of the

Shielding run to reduce the moire effect when using the display of the radio telephone.

8. shielding shell according to one of claims 5 to 7, wherein the Abschirmstoff is single-ply and / or a middle

Mesh size of less than 1 mm.

9. shielding shell according to one of the preceding claims, wherein the average thickness of the front side (1) is smaller than 1 mm.

10. shielding shell according to one of the preceding claims, wherein the rear side (2) is a passive antenna element (7) for improving the reception by the antenna of the

Radio telephone has.

11. shielding shell according to claim 10, wherein at

Recording the radio telephone set in the shield shell, the antenna in the region of the upper half of the passband (2a) and the passive antenna element (7) in the region of the lower half of the passband (2a) are arranged.

12. shielding shell according to one of the preceding claims, wherein the front side (1) via side elements (4-6) with the back (2) is connected, which are at least partially made of shielding material which is electrically conductive with the shielding material of the front side (1) connected is.

13. shielding shell according to one of the preceding claims, wherein the front side (1) has through openings, so that it is largely transparent to the use of speaker and microphone of the radio remote.

14. shielding shell according to any one of the preceding claims, which is designed so that in their application, the SAR value of the radio remote console is reduced by at least 80%.

15. shielding shell according to one of the preceding claims, wherein the rear side (2) for forming the passage region (2a) has a cutout.