CN102497611A - Bone conduction speaker driver with reduced volume - Google Patents
Bone conduction speaker driver with reduced volume Download PDFInfo
- Publication number
- CN102497611A CN102497611A CN2011104380824A CN201110438082A CN102497611A CN 102497611 A CN102497611 A CN 102497611A CN 2011104380824 A CN2011104380824 A CN 2011104380824A CN 201110438082 A CN201110438082 A CN 201110438082A CN 102497611 A CN102497611 A CN 102497611A
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- conduction speaker
- bone
- speaker driver
- vibration
- plate
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- 210000000988 bone and bone Anatomy 0.000 title abstract description 9
- 238000012856 packing Methods 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 6
- 230000009977 dual effect Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 210000000860 cochlear nerve Anatomy 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 210000003454 tympanic membrane Anatomy 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 210000000883 ear external Anatomy 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 210000001061 forehead Anatomy 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000032696 parturition Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
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Abstract
The invention discloses a bone conduction speaker driver with a reduced volume. The bone conduction speaker driver comprises a panel, a vibration conducting sheet, a vibrating board and a bottom plate, wherein an inner magnet and an annular magnet are fixedly arranged on the bottom plate; an inner magnetic conducting plate is fixedly arranged on the top surface of the inner magnet; an annular magnetic conducting plate is fixedly arranged on the top surface of the annular magnet; a space is reserved between the annular magnetic conducting plate and the inner magnetic conducting plate; a voice coil adhered to the lower side of the vibrating plate is extended downwards to be arranged in the space; and a gasket is arranged on the top surface of the annular magnetic conducting plate and is fixedly connected with the edge of the vibration conducting sheet. Due to the adoption of the gasket and a double-magnet structure, the sensitivity of the bone conduction speaker driver is greatly improved; and meanwhile, a shell is omitted and the vibration conducting sheet is directly fixed on a magnetic circuit system through the gasket, thus the effect of reducing the volume of the bone conduction speaker driver is achieved.
Description
Technical field
The present invention relates to a kind of bone-conduction speaker driver and reduce the volume design.
Background technology
Why the people can hear sound, is because airborne vibration has been arrived ear-drum to vibration transfer through the external ear duct, the vibratory drive people's who forms through ear-drum auditory nerve.
During bone-conduction speaker work, the shell that driver promotes bone-conduction speaker produces vibration, and this vibration frequency is in audiorange.Because the shell of bone-conduction speaker is close on people's the skin,, thereby make the people hear sound so the vibration that bone-conduction speaker produces is delivered to people's auditory nerve through people's skin, hypodermis and bone.
Fig. 1 is the longitudinal section of the bone-conduction speaker device structure of prior art.This bone-conduction speaker generally includes: body 1, and it has the drum that open on top; Yoke 2, its bottom and its center that is arranged in the body 1 has lug boss 3; Toroidal magnet 4, its formation also is fixed on the edge of yoke 2, and stays out preset space length with the edge of above-mentioned lug boss 3; Upper plate 5, its formation also touches in the upside of said magnet 4; Papilla 9, it touches user's osteoacusis position, and vibration, is transferred to user voice through it; Acoustic vibration plate 8, it is inserted in the open part of the downside of papilla 9 with covering body 1, and is processed by elastomeric material; Auxiliary vibration plate 7, it is inserted in the below of papilla 9, between papilla 9 and acoustics oscillating plate 8, is provided with; Voice loop 6, it is connected with auxiliary vibration plate 7, and is inserted between the edge and toroidal magnet 4 of lug boss 3 of yoke 2; Protecgulum 10 is used for acoustic vibration plate 8 is fixed on body 1; And electrical signal input unit 12,13 and 14, can be used to input electrical signal and give voice loop 6.
In this bone-conduction speaker, acoustic vibration plate 8 is fixed on the body 1, vibrates between the gap that makes voice loop 6 to form at the edge and the toroidal magnet 4 of the lug boss 3 of yoke 2.It is thus clear that body 1 is to form the gap between vibrational system and the magnetic system, vibrative critical component.The magnetic field intensity that toroidal magnet 4 is given birth at voice loop 6 energising generation inductions by current is taking place to change; Inductance also changes thereupon; Thereby cause that oscillating movement longitudinally also takes place auxiliary vibration plate 7; Acoustic vibration plate 8 also moves along with the motion of auxiliary vibration plate 7, makes papilla 9 vibrations thereby the vibration of acoustic vibration plate 8 afterwards is transferred to papilla 9.The vibration of papilla 9 is transmitted with the stimulation auditory nerve through user's bone, thereby makes the people hear sound.
Yet; Because the oscillating plate periodic vibration of bone-conduction speaker driver needs the gap of lengthwise movement; So prior art is had to produce the space that needs through the support of acoustic vibration plate and shell or body; This also makes has increased size on device, caused final Headphone device overall volume to increase, and can't develop to the direction of miniaturization.In addition, the magnet structure of prior art is single magnet structure, promptly have only toroidal magnet 4, and yoke 2 is magnetic conductors, and leakage field is bigger like this, and enough magnetic flux distribution can not be arranged, the level of sensitivity of when reducing volume, having limited to bone-conduction speaker.
The size of bone-conduction speaker is more little, and application market is just extensive more., the size of bone-conduction speaker is more little, and sensitivity is just low more.So, how can keep under the constant even higher situation of sensitivity, the size that as far as possible reduces bone-conduction speaker just becomes a difficult problem highly significant.
Therefore, prior art awaits to improve and development.
Summary of the invention
The object of the present invention is to provide a kind of bone-conduction speaker driver that reduces volume
,Improve existing bone-conduction speaker, the cancellation shell also directly is fixed on vibration-transmitting plate on the magnetic circuit system after the improvement through increasing packing ring, thereby realizes that the bone-conduction speaker driver reduces the scheme of volume.
Technical scheme of the present invention comprises:
A kind of bone-conduction speaker driver that reduces volume, its setting comprises a panel, vibration-transmitting plate and oscillating plate, wherein, said panel is fastened on the center of said vibration-transmitting plate and said oscillating plate; And a base plate is set with an inner magnet and a toroidal magnet on said base plate, and said inner magnet is arranged on the center of said toroidal magnet, and and toroidal magnet between be provided with the gap; Fixedly install interior magnetic conductive board at said inner magnet end face, fixedly install annular magnetic conductive board at the end face of said toroidal magnet, said annular magnetic conductive board and said in be provided with the gap between the magnetic conductive board; One be bonded in the oscillating plate downside voice coil loudspeaker voice coil be arranged in the said gap to extending below;
And the end face of said annular magnetic conductive board is provided with a packing ring, and is fixedly connected the edge of said vibration-transmitting plate.
Described bone-conduction speaker driver, wherein, said panel central authorities are provided with a through hole, are used to derive the lead of said voice coil loudspeaker voice coil.
Described bone-conduction speaker driver, wherein, said panel is set to planar structure or arc structure.
Described bone-conduction speaker driver, wherein, said oscillating plate is provided with the groove of the said vibration-transmitting plate of engaging.
Described bone-conduction speaker driver, wherein, each building block of said bone-conduction speaker driver passes through glue.
A kind of bone-conduction speaker driver that reduces volume provided by the present invention owing to adopted packing ring and dual magnetic body structure, effectively raises the sensitivity of bone-conduction speaker driver; Simultaneously, the cancellation shell directly is fixed on vibration-transmitting plate on the magnetic circuit system through increasing packing ring, thereby has realized that the bone-conduction speaker driver reduces the effect of volume.The present invention is owing to adopt the dual magnetic body structure, and the distribution of its magnetic line of force is to have sealed magnetic loop, and leakage field is minimum like this, has also increased the magnetic flux distribution of magnetic circuit, causes sensitivity to increase.
Description of drawings
Fig. 1 is the longitudinal section of the bone-conduction speaker device structure of prior art.
Fig. 2 is the longitudinal section of bone-conduction speaker activation configuration of the present invention.
Fig. 3 is the exploded perspective view of bone-conduction speaker activation configuration of the present invention.
Fig. 4 is the stereogram of bone-conduction speaker activation configuration of the present invention.
Embodiment
Below in conjunction with accompanying drawing, will carry out more detailed explanation to each preferred embodiment of the present invention.
The present invention reduces in the preferred embodiment of bone-conduction speaker driver of volume; As shown in Figures 2 and 3; Saved the shell of prior art, its structure is adjusted, and this driver setting comprises: the vibrational system of panel 21, vibration-transmitting plate 15 and oscillating plate 16; Its vibration-transmitting plate 15 has thin thickness and can increase elastic force; Vibration-transmitting plate 15 is that the groove center that is stuck in oscillating plate 16 is provided with, and said panel 21 is set to planar structure or arcuate structure, and is fastened on the center of said vibration-transmitting plate 15 and said oscillating plate 16; What be bonded in oscillating plate 16 downsides is voice coil loudspeaker voice coil 19; Annular magnetic conductive board 18, toroidal magnet 22, interior magnetic conductive board 20, inner magnet 23 and base plate 24 have been formed magnetic system; Said inner magnet 23 and said toroidal magnet 22 are set on said base plate 24; Said inner magnet 23 is arranged on the center of said toroidal magnet 22; And and toroidal magnet 22 between be provided with the gap, magnetic conductive board 20 in said inner magnet 23 end faces fixedly install, simultaneously the end face at said toroidal magnet 22 fixedly installs said annular magnetic conductive board 18; Said annular magnetic conductive board 18 and said in also be provided with the gap between the magnetic conductive board 20, said voice coil loudspeaker voice coil 19 is arranged in the said gap to extending below.
Said vibrational system is connected through packing ring 17 with magnetic system, and this packing ring is arranged on the end face of said annular magnetic conductive board 18, and is fixedly connected the edge of said vibration-transmitting plate 15; This bone-conduction speaker is connected with outside through panel 21, transfers vibrations to people's bone then, and panel 21 is stuck in vibration-transmitting plate 15 and is provided with oscillating plate 16 centers.The bone-conduction speaker drive unit that the present invention is complete is as shown in Figure 4.
In the bone-conduction speaker driver that reduces volume according to the invention; Said annular magnetic conductive board 18, toroidal magnet 22, interior magnetic conductive board 20, inner magnet 23 and base plate 24 have been formed magnetic system; The corresponding variation taking place in the magnetic field intensity of giving birth at voice coil loudspeaker voice coil 19 energising generation inductions by current, and inductance also changes thereupon, makes voice coil loudspeaker voice coil 19 that back and forth movement longitudinally take place; And cause the vibration of oscillating plate 16; Thereby give vibration-transmitting plate 15 with vibration transfer, at last via behind panel 21 and the people's ear, positions such as cheek or forehead contact and transfer vibrations to people's bone, thereby generation sound.
The present invention adopts the dual magnetic body structure by toroidal magnet 22 and inner magnet 23; The polarity in magnetic field arranges according to opposite mode, is N utmost points such as the upper end of inner magnet 23, when the lower end is the S utmost point; It is the S utmost point that toroidal magnet 22 will adopt the upper end, and the lower end is the set-up mode of the N utmost point.Otherwise the upper end that is exactly inner magnet 23 is the S utmost point, and when the lower end was the N utmost point, it was the N utmost point that toroidal magnet 22 will adopt the upper end, and the lower end is the S utmost point.Interior magnetic conductive board 20 above the magnet and annular magnetic conductive board 18 are because the effect of magnet also produces antipole property.Voice coil loudspeaker voice coil 19 is in the gap of interior magnetic conductive board 20 and annular magnetic conductive board 18, and the magnetic line of force in the magnetic system can be because of being not that the effect of single magnet and manifesting enlarges outward, in the magnetic line of force can only concentrate in the gap of magnetic conductive board 20 and annular magnetic conductive board 18.Therefore, having applied at voice coil loudspeaker voice coil 19 has bigger active force to carry out vertical back and forth movement in the magnetic field in closure behind the AC signal, thereby reaches the effect of the sensitivity that improves bone-conduction speaker.The present invention adopts the dual magnetic body structure of toroidal magnet 22 and inner magnet 23, and the distribution of its magnetic line of force is to have sealed magnetic loop, and leakage field is minimum like this, has also increased the magnetic flux distribution of magnetic circuit, causes sensitivity to increase.
In the preferred embodiment of the present invention; As shown in Figure 2, in the said bone-conduction speaker driver, the central authorities of said panel 21 are provided with a through hole 211; And on corresponding vibration-transmitting plate 15 and the oscillating plate 16 corresponding perforation is set, to be used to derive the lead 191 of said voice coil loudspeaker voice coil 19.This set mode can make lead 191 vibrate with structures such as voice coil loudspeaker voice coil and vibration-transmitting plates, and avoids in the prior art lead by the vibration disconnected problem of shaking.This technical pattern is different from prior art; Prior art is that the voice coil loudspeaker voice coil lead is gone to splicing ear from the side fluting; And the voice coil loudspeaker voice coil lead is unsettled stretching state at a middle segment distance, does axial back and forth movement when signal input after vibration part together with the voice coil loudspeaker voice coil lead, and it is disconnected to cause lead to shake easily.
In the preferred embodiment of bone-conduction speaker driver according to the invention; Its each building block can be passed through glue; Be very helpful for reducing volume like this, assemble and the increase of the volume that causes because reduced with the mode of screw or injection mo(u)lding.
The present invention has been through having increased a packing ring 17, and cancelled the body of prior art and the acoustic vibration plate directly is fixed on the packing ring, reduced the volume of bone-conduction speaker driver, and technology is simple, cost is lower; The bone-conduction speaker that is obtained has avoided the housing volume to become the problem that causes driver weight to increase greatly owing to having cancelled body, promotes it to develop to miniaturization; Increase the dual magnetic body structure, effectively raised the effect of the sensitivity of bone-conduction speaker driver.Thereby expanded the application of bone-conduction speaker at commercial fields such as communication equipments.
Should be understood that above-mentioned description to preferred embodiment of the present invention is comparatively concrete, can not therefore think the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with accompanying claims.
Claims (5)
1. bone-conduction speaker driver that reduces volume, its setting comprises a panel, vibration-transmitting plate and oscillating plate, it is characterized in that, said panel is fastened on the center of said vibration-transmitting plate and said oscillating plate; And a base plate is set with an inner magnet and a toroidal magnet on said base plate, and said inner magnet is arranged on the center of said toroidal magnet, and and toroidal magnet between be provided with the gap; Fixedly install interior magnetic conductive board at said inner magnet end face, fixedly install annular magnetic conductive board at the end face of said toroidal magnet, said annular magnetic conductive board and said in be provided with the gap between the magnetic conductive board; One be bonded in the oscillating plate downside voice coil loudspeaker voice coil be arranged in the said gap to extending below;
And the end face of said annular magnetic conductive board is provided with a packing ring, and is fixedly connected the edge of said vibration-transmitting plate.
2. bone-conduction speaker driver according to claim 1 is characterized in that, said panel central authorities are provided with a through hole, are used to derive the lead of said voice coil loudspeaker voice coil.
3. bone-conduction speaker driver according to claim 1 is characterized in that said panel is set to planar structure or arc structure.
4. bone-conduction speaker driver according to claim 1 is characterized in that, said oscillating plate is provided with the groove of the said vibration-transmitting plate of engaging.
5. according to the arbitrary described bone-conduction speaker driver of claim 1 to 4, it is characterized in that each building block of said bone-conduction speaker driver passes through glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110438082.4A CN102497611B (en) | 2011-12-23 | 2011-12-23 | Bone conduction speaker driver with reduced volume |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110438082.4A CN102497611B (en) | 2011-12-23 | 2011-12-23 | Bone conduction speaker driver with reduced volume |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102497611A true CN102497611A (en) | 2012-06-13 |
| CN102497611B CN102497611B (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110438082.4A Active CN102497611B (en) | 2011-12-23 | 2011-12-23 | Bone conduction speaker driver with reduced volume |
Country Status (1)
| Country | Link |
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| CN (1) | CN102497611B (en) |
Cited By (11)
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| CN103716738A (en) * | 2013-12-18 | 2014-04-09 | 张木云 | Vibration loudspeaker |
| CN104837086A (en) * | 2015-02-09 | 2015-08-12 | 胡锦翔 | Bone conduction earphone speaker |
| CN104936108A (en) * | 2015-06-11 | 2015-09-23 | 胡锦翔 | Bone conduction loudspeaker device |
| CN104936104A (en) * | 2015-06-11 | 2015-09-23 | 胡锦翔 | Vibrator device of vibration loudspeaker with small volume |
| CN105050012A (en) * | 2015-08-24 | 2015-11-11 | 张扬 | Loudspeaker and assembling method thereof |
| CN105635920A (en) * | 2016-02-22 | 2016-06-01 | 成都聚智工业设计有限公司 | Novel audio vibration device |
| CN106210996A (en) * | 2016-08-09 | 2016-12-07 | 苏州倍声声学技术有限公司 | A kind of double vibration-transmitting plate bone-conduction speaker and manufacture method thereof |
| CN106954153A (en) * | 2015-08-13 | 2017-07-14 | 深圳市韶音科技有限公司 | Bone-conduction speaker |
| WO2018081915A1 (en) * | 2016-11-01 | 2018-05-11 | 声电电子科技(惠州)有限公司 | Miniature loudspeaker with dual-washer structure |
| WO2019134162A1 (en) * | 2018-01-08 | 2019-07-11 | 深圳市韶音科技有限公司 | Bone conduction loudspeaker |
| CN116156381A (en) * | 2023-02-21 | 2023-05-23 | 迈吉科(山东)医疗器械有限公司 | Bone conduction earphone with transducer provided with vibration supporting arm |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716738A (en) * | 2013-12-18 | 2014-04-09 | 张木云 | Vibration loudspeaker |
| CN104837086A (en) * | 2015-02-09 | 2015-08-12 | 胡锦翔 | Bone conduction earphone speaker |
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| CN104936104A (en) * | 2015-06-11 | 2015-09-23 | 胡锦翔 | Vibrator device of vibration loudspeaker with small volume |
| CN104936104B (en) * | 2015-06-11 | 2018-06-26 | 深圳市喜声多媒体技术有限公司 | A kind of vibrating speaker oscillator device of small size |
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| CN106954153B (en) * | 2015-08-13 | 2020-04-14 | 深圳市韶音科技有限公司 | Bone conduction loudspeaker |
| CN105050012A (en) * | 2015-08-24 | 2015-11-11 | 张扬 | Loudspeaker and assembling method thereof |
| CN105635920A (en) * | 2016-02-22 | 2016-06-01 | 成都聚智工业设计有限公司 | Novel audio vibration device |
| CN106210996A (en) * | 2016-08-09 | 2016-12-07 | 苏州倍声声学技术有限公司 | A kind of double vibration-transmitting plate bone-conduction speaker and manufacture method thereof |
| CN106210996B (en) * | 2016-08-09 | 2019-04-23 | 苏州倍声声学技术有限公司 | A kind of double vibration-transmitting plate bone-conduction speakers and its manufacturing method |
| WO2018081915A1 (en) * | 2016-11-01 | 2018-05-11 | 声电电子科技(惠州)有限公司 | Miniature loudspeaker with dual-washer structure |
| WO2019134162A1 (en) * | 2018-01-08 | 2019-07-11 | 深圳市韶音科技有限公司 | Bone conduction loudspeaker |
| WO2019134387A1 (en) * | 2018-01-08 | 2019-07-11 | 深圳市韶音科技有限公司 | Bone conduction speaker |
| EP3723388A4 (en) * | 2018-01-08 | 2020-12-23 | Shenzhen Voxtech Co., Ltd. | Bone conduction speaker |
| US11172309B2 (en) | 2018-01-08 | 2021-11-09 | Shenzhen Voxtech Co., Ltd. | Bone conduction speaker |
| US11197100B2 (en) * | 2018-01-08 | 2021-12-07 | Shenzhen Voxtech Co., Ltd. | Bone conduction speaker |
| US20220060834A1 (en) * | 2018-01-08 | 2022-02-24 | Shenzhen Voxtech Co., Ltd. | Bone conduction speaker |
| US11304008B2 (en) | 2018-01-08 | 2022-04-12 | Shenzhen Shokz Co., Ltd. | Bone conduction speaker |
| US11310602B2 (en) | 2018-01-08 | 2022-04-19 | Shenzhen Shokz Co., Ltd. | Bone conduction speaker |
| US11711654B2 (en) | 2018-01-08 | 2023-07-25 | Shenzhen Shokz Co., Ltd. | Bone conduction speaker |
| US11765515B2 (en) | 2018-01-08 | 2023-09-19 | Shenzhen Shokz Co., Ltd. | Bone conduction speaker |
| US11765510B2 (en) | 2018-01-08 | 2023-09-19 | Shenzhen Shokz Co., Ltd. | Bone conduction speaker |
| US11778384B2 (en) * | 2018-01-08 | 2023-10-03 | Shenzhen Shokz Co., Ltd. | Bone conduction speaker |
| CN116156381A (en) * | 2023-02-21 | 2023-05-23 | 迈吉科(山东)医疗器械有限公司 | Bone conduction earphone with transducer provided with vibration supporting arm |
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| CN102497611B (en) | 2014-10-01 |
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Denomination of invention: Bone conduction speaker driver with reduced volume Effective date of registration: 20151119 Granted publication date: 20141001 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shaoyin Science and Technology Co., Ltd., Shenzhen city Registration number: 2015990001032 |
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Denomination of invention: Bone conduction speaker driver with reduced volume Effective date of registration: 20170217 Granted publication date: 20141001 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shaoyin Science and Technology Co., Ltd., Shenzhen city Registration number: 2017440020004 |
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Date of cancellation: 20171225 Granted publication date: 20141001 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shaoyin Science and Technology Co., Ltd., Shenzhen city Registration number: 2017440020004 |
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Denomination of invention: Bone conduction speaker driver with reduced volume Effective date of registration: 20180109 Granted publication date: 20141001 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shaoyin Science and Technology Co., Ltd., Shenzhen city Registration number: 2018440020002 |
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Date of cancellation: 20190227 Granted publication date: 20141001 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shaoyin Science and Technology Co., Ltd., Shenzhen city Registration number: 2018440020002 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
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Denomination of invention: Bone conduction speaker driver with reduced volume Effective date of registration: 20190227 Granted publication date: 20141001 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shaoyin Science and Technology Co., Ltd., Shenzhen city Registration number: 2019440020020 |
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Date of cancellation: 20200401 Granted publication date: 20141001 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: SHENZHEN VOXTECH Co.,Ltd. Registration number: 2019440020020 |
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