CN106954149B - Minitype acoustic generator - Google Patents

Minitype acoustic generator Download PDF

Info

Publication number
CN106954149B
CN106954149B CN201710170295.0A CN201710170295A CN106954149B CN 106954149 B CN106954149 B CN 106954149B CN 201710170295 A CN201710170295 A CN 201710170295A CN 106954149 B CN106954149 B CN 106954149B
Authority
CN
China
Prior art keywords
fixed
flange
acoustic generator
shell
cover
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
CN201710170295.0A
Other languages
Chinese (zh)
Other versions
CN106954149A (en
Inventor
刘岩涛
程汉龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goertek Inc
Original Assignee
Goertek Inc
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
Application filed by Goertek Inc filed Critical Goertek Inc
Priority to CN201710170295.0A priority Critical patent/CN106954149B/en
Publication of CN106954149A publication Critical patent/CN106954149A/en
Application granted granted Critical
Publication of CN106954149B publication Critical patent/CN106954149B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06Loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/16Mounting or tensioning of diaphragms or cones
    • H04R7/18Mounting or tensioning of diaphragms or cones at the periphery

Abstract

The invention discloses a kind of minitype acoustic generators, it is related to electro-acoustic product technical field, including combined shell and front cover, vibrational system and magnetic circuit system are contained in the space that the shell and the front cover surround, the vibrational system includes the vibrating diaphragm that edge part is fixed between the front cover and the shell, the front cover has side wall, the edge part includes that the fixed part and the flange being folded upward on the outside of the fixed part, the flange positioned inside are fixed on the outer surface of the side wall.Minitype acoustic generator of the present invention solves the technical issues of minitype acoustic generator poor waterproof properties in the prior art, and minitype acoustic generator waterproof performance of the present invention is good, the stability and high reliablity of waterproof, while acoustical behavior is good, long service life.

Description

Minitype acoustic generator
Technical field
The present invention relates to electro-acoustic product technical field, in particular to a kind of minitype acoustic generator.
Background technique
Minitype acoustic generator is the important acoustic element of portable electronic device, for completing between electric signal and voice signal Conversion, be a kind of energy conversion device.Existing minitype acoustic generator includes combined shell and front cover, and shell is with before Cover in the space that surrounds and contain vibrational system and magnetic circuit system, the edge of vibrational system be fixed on shell and front cover it Between, i.e. the edge of the vibrating diaphragm of vibrational system is fixed between shell and front cover.
Minitype acoustic generator is mounted in portable electronic device, when electronic equipment is fallen into water or is contacted in other forms When to water, water can be through the going out on the vibrating diaphragm that acoustic aperture enters minitype acoustic generator from minitype acoustic generator of the acoustic aperture on electronic equipment casing The space in portion enters in the space of the preceding operatic tunes of minitype acoustic generator, if poorly sealed between vibrating diaphragm and front cover, into Entering to the water in the preceding operatic tunes from the inner cavity that gap between the two enters electronic equipment, can will lead to zero of electronic equipment Part or circuit damage, therefore require minitype acoustic generator that there is preferable water-proof function.
Current water proof type minitype acoustic generator depends primarily on the sealing performance between vibrating diaphragm and front cover, this just needs to do To two o'clock: first is that bonding glue will not be flooded profit failure;Second is that the rubber fabric between vibrating diaphragm and front cover is smooth and has certain Width, rubber fabric is wider, and waterproof effect is better, but the width of rubber fabric influences whether effective vibration area of vibrating diaphragm, apply Effective vibration area of the wider vibrating diaphragm of adhesive tape is smaller, will cause the loss of sensitivity, influences the acoustical behavior of minitype acoustic generator.And And such anti-aqueous mode, highly dependent upon the quality of glue, once glue fails, water-proof function will be destroyed, minitype acoustic generator Just no longer there is water-proof function.
Summary of the invention
For disadvantages described above, technical problem to be solved by the invention is to provide a kind of minitype acoustic generator, this miniature sounding Device waterproof performance is good, the stability and high reliablity of waterproof, while acoustical behavior is high.
In order to solve the above technical problems, the technical scheme is that
The sky that a kind of minitype acoustic generator, including combined shell and front cover, the shell and the front cover surround In contain vibrational system and magnetic circuit system, the vibrational system include edge part be fixed on the front cover and the shell it Between vibrating diaphragm, the front cover has a side wall, the edge part include positioned inside fixed part and be located on the outside of the fixed part The flange being folded upward at, the flange is fixed on the outer surface of the side wall.
Wherein, it is adhesively fixed between the upper surface of the fixed part and the lower end surface of the side wall by glue-line, it is described solid Determine to be adhesively fixed between the lower surface in portion and the upper surface of the shell by glue-line, the outer surface of the flange and the side wall Between be adhesively fixed by glue-line.
Wherein, it is fixed between the flange and the outer surface of the side wall by laser welding.
Wherein, the position that the outside of the side wall corresponds to the flange is equipped with the depressed area being recessed inwardly, the flange patch It closes on the side surface of the depressed area.
Wherein, mounting groove is formed between the depressed area and the upper surface of the shell, is equipped with sealing in the mounting groove Bullet circle, the sealing play snare in the outside of the flange.
Wherein, the outer surface three of the outer surface of the side wall, the outer surface of the sealing bullet circle and the side wall of outer shell It flushes.
Wherein, the middle part injection molding of the front cover is combined with steel disc.
Wherein, the magnetic circuit system includes magnetic yoke, and the center of the magnetic yoke is successively fixed with internal magnet and interior magnetic conduction Plate, the marginal position of the magnetic yoke are successively fixed with external magnet and outer magnetic conductive board.
Wherein, the outer edge of the outer magnetic conductive board is located at the outer peripheral inside of the external magnet, the inside of the shell Positioning region equipped with hierarchic structure, the positioning region are adapted with the outer edge structure of the outer magnetic conductive board and the external magnet.
After above-mentioned technical proposal, the beneficial effects of the present invention are:
Since the edge part of the vibrating diaphragm of minitype acoustic generator of the present invention is fixed between front cover and shell, the edge part of vibrating diaphragm is wrapped It includes fixed part and the flange being folded upward on the outside of fixed part, flange positioned inside and is fixed on the outside of front cover side wall. The flange being folded upward at can play barrier effect to the water in the space for entering vibrating diaphragm top, while increase vibrating diaphragm and front cover Bond area, even if horizontal plane between vibrating diaphragm and front cover is be bonded that imprecision or glue failure, water can be stopped back by flange Come, the inside without entering electronic equipment by minitype acoustic generator plays the role of waterproof.The present invention passes through in vibrating diaphragm The flange that is folded upward at is arranged in edge part, and flange is fixed on the outer surface of front cover side wall and realizes sealing, and existing Glue adhering and sealing in technology, which is compared, to be had the advantage that
One, it uses and increases bond area in side, to not need very big bond area, Bu Huizhan in the horizontal plane With the inner space of minitype acoustic generator, effective vibration area of vibrating diaphragm will not be reduced, be conducive to improve the sensitive of minitype acoustic generator Degree, improves the acoustical behavior of minitype acoustic generator;
Two, without relying on the performance of glue, the stability and reliability of waterproof are greatly improved, and waterproof performance is high, sealing Effect is good.
Since the position that the outside of front cover side wall corresponds to flange is equipped with depressed area, flange is bonded on the side of depressed area, It can be avoided the outer surface that flange protrudes from side wall, not will increase the outer dimension of minitype acoustic generator, while flange can also be reduced The risk peeled off from side wall is conducive to the stability and reliability that improve waterproof.
Due to forming mounting groove between depressed area and the upper surface of shell, it is equipped with sealing bullet circle in mounting groove, seals bullet circle It covers in the outside of flange, sealing bullet circle itself is the performance with sealing waterproof, while it has elasticity, is risen on the outside to flange To the effect tied tight, effectively avoids flange and peeled off from side wall, the further waterproof performance for improving minitype acoustic generator.
Since the outer edge of outer magnetic conductive board is located at the outer peripheral inside of external magnet, shell is equipped with outer magnetic conductive board and outside The compatible positioning region of the outer edge structure of magnet.The edge of i.e. outer magnetic conductive board and the outer edge of external magnet form ladder knot Structure, positioning region are compatible inverted steps structure, outer surface and upper surface with upper surface, outer magnetic conductive board on the outside of external magnet It fits, positioning region plays positioning action when assembling minitype acoustic generator, while also increasing connecing for shell and magnetic circuit system Contacting surface product, reduces the risk that magnetic circuit system falls off from shell, improves the reliability of minitype acoustic generator, extend miniature hair The service life of sound device.
In conclusion the technology that minitype acoustic generator of the present invention solves minitype acoustic generator poor waterproof properties in the prior art is asked Topic, minitype acoustic generator waterproof performance of the present invention is good, the stability and high reliablity of waterproof, while acoustical behavior is good, service life It is long.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of minitype acoustic generator of the present invention;
Fig. 2 is the portion the A enlarged drawing of Fig. 1;
In figure: 10, shell, 12, positioning region, 20, front cover, 22, depressed area, 24, steel disc, 30, vibrating diaphragm, 300, flange, 32, Oscillating plate, 34, voice coil, 40, magnetic yoke, 42, internal magnet, 44, external magnet, 46, interior magnetic conductive board, 48, outer magnetic conductive board, 49, magnetic gap, 50, bullet circle, 60, mounting groove are sealed.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is further explained.
The inside being related in this specification refers to that, close to the side at minitype acoustic generator center, outside refers to far from minitype acoustic generator The side at center;Refer to the orientation for being equipped with vibrational system in the orientation being related to, refers to the orientation for being equipped with magnetic circuit system under orientation.
As shown in Figure 1, a kind of minitype acoustic generator, including shell 10 and it is incorporated in the front cover 20 of 10 upper end of shell, shell 10 Vibrational system and magnetic circuit system are contained in the space surrounded with front cover 20.Magnetic circuit system is fixed on the inside of shell 10, vibration The edge part of system is fixed between the upper surface of shell 10 and the lower end surface of front cover 20.
As shown in Figure 1, vibrational system includes vibrating diaphragm 30, the middle part of vibrating diaphragm 30 is fixed with oscillating plate 32, in present embodiment Oscillating plate 32 is fixed on the upside at 30 middle part of vibrating diaphragm, is fixed with voice coil 34 on the downside of the middle part of vibrating diaphragm 30.Magnetic circuit system includes magnetic Yoke 40, magnetic yoke 40 are plate structure.The center of magnetic yoke 40 is successively fixed with internal magnet 42 and interior magnetic conductive board 46, magnetic yoke 40 Marginal position is fixed with external magnet 44 and outer magnetic conductive board 48.Internal magnet 42 and interior magnetic conductive board 46 constitute the internal magnetic circuit of magnetic circuit system, External magnet 44 and outer magnetic conductive board 48 constitute the external magnetic circuit of magnetic circuit system, and magnetic gap 49, voice coil are equipped between internal magnetic circuit and external magnetic circuit 34 end is located in magnetic gap 49.Voice coil 34 is done back and forth according to by the sound wave electric signal in its coiling in magnetic gap 49 Cutting magnetic line movement instigate air sounding so that vibrating diaphragm 30 and oscillating plate 32 be driven to vibrate up and down, realize between electroacoustic Energy conversion.The middle part injection molding of front cover 20 is combined with steel disc 24, and steel disc 24 is equipped with acoustic aperture (not shown), vibrating diaphragm 30 And oscillating plate 32 instigates the sound of air sending from going out at acoustic aperture to external radiation.
As Fig. 1 and Fig. 2 jointly shown in, front cover 20 have side wall, the edge part of vibrating diaphragm 30 constitutes the edge of vibrational system Portion, this edge part include the fixed part positioned inside and the flange 300 being folded upward on the outside of fixed part, fixed part clamping It is fixed between the side wall lower ends face of front cover 20 and the upper surface of shell 10, the upper surface of fixed part is adhesively fixed on by glue-line On the lower end surface of the side wall of front cover 20, the lower surface of fixed part is adhesively fixed on the upper surface of shell 10 by glue-line, flange On the outer surface of 300 side walls that can be adhesively fixed on front cover 20 by glue-line, front cover 20 can also be fixed on by laser welding Side wall outer surface on, i.e. the edge part of vibrating diaphragm 30 protrudes horizontally up the side wall of front cover 20 and is folded upward at along the outer surface of side wall Extend, flange 300 can play barrier effect to the water for entering 30 top of vibrating diaphragm.
As Fig. 1 and Fig. 2 jointly shown in, the side-wall outer side of front cover 20 correspond to flange 300 position be equipped be recessed inwardly it is recessed Area 22 is fallen into, flange 300 is bonded on the side surface of depressed area 22.One is formed between depressed area 22 and the upper surface of shell 10 The annular mounting groove 60 of outward opening.It is equipped with sealing bullet circle 50 in mounting groove 60, seals 50 sets of the bullet circle outsides in flange 300, After sealing bullet circle 50 is installed in mounting groove 60, the wall outer surface of front cover 20, the outer surface for sealing bullet circle 50 and shell 10 Wall outer surface three flushes.Natural rubber, nitrile rubber, neoprene rubber can be selected in the material that bullet circle 50 is sealed in present embodiment Glue, fluorubber or silicon rubber etc., but be not limited to it is above-mentioned several, as long as the material with elasticity and with waterproof performance is equal It can.Sealing bullet circle 50 itself is the performance with waterproof, while it can be avoided flange 300 from the sidewall surfaces of front cover 20 It peels off, further improves the stability and reliability of waterproof.
As shown in Figure 1, the width of outer magnetic conductive board 48 be less than external magnet 44 width, and the inward flange of outer magnetic conductive board 48 and The inward flange of external magnet 44 is substantially flush, then the outer edge of outer magnetic conductive board 48 is located at the outer peripheral inside of external magnet 44, i.e., outer Magnetic conductive board 48 makes the outer edge of magnetic circuit system form positive hierarchic structure after being combined with external magnet 44.The inside of shell 10 is equipped with With determining for the compatible inverted steps structure of positive hierarchic structure of the outer edge of the outer edge of outer magnetic conductive board 48 and external magnet 44 formation Position portion 12, i.e. positioning region 12 are buckled on outer magnetic conductive board 48 and external magnet 44, outer upper surface, outer magnetic conductive board 48 with external magnet 44 Side surface and the upper surface of outer magnetic conductive board 48 fit, the combination that can effectively enhance between magnetic circuit system and shell 10 is strong Degree, prevents magnetic circuit system from falling off from shell 10.
The present invention is folded upward at by will be folded upward on the wall outer surface for being fixed on front cover on the outside of the edge part of vibrating diaphragm Flange can play barrier effect to the water in the space for entering vibrating diaphragm top, even if the horizontal plane between vibrating diaphragm and front cover is viscous Imprecision or glue failure are connect to obtain, water can be stopped to return by flange, without being entered in electronic equipment by minitype acoustic generator Portion plays the role of waterproof;The sensitivity that also will not influence minitype acoustic generator simultaneously is conducive to the sound for improving minitype acoustic generator Learn performance.
This specification is only that technical solution of the present invention is illustrated by taking the minitype acoustic generator of above structure as an example, Technical solution of the present invention is not limited in the minitype acoustic generator of above structure in practical application, can be applied to any one In the minitype acoustic generator of water proof type, those skilled in the art does not need to pay any creation according to the elaboration of above-described embodiment Technical solution of the present invention can be applied in the minitype acoustic generator of other structures by the labour of property, thus no matter minitype acoustic generator Other structures it is whether identical with above-described embodiment, as long as the edge part of vibrating diaphragm is folded upward to realize waterproof sealing, Product to improve waterproof performance is fallen within the protection scope of the present invention.
The present invention is not limited to above-mentioned specific embodiment, those skilled in the art from the above idea, Without creative labor, the various transformation made are within the scope of the present invention.

Claims (7)

1. being received in the space that minitype acoustic generator, including combined shell and front cover, the shell and the front cover surround Have vibrational system and magnetic circuit system, the vibrational system includes the vibration that edge part is fixed between the front cover and the shell Film, which is characterized in that the front cover has side wall, and the edge part includes positioned at the fixed part of inside and positioned at the fixed part The flange being folded upward in outside, the flange are fixed on the outer surface of the side wall;
The position that the outside of the side wall corresponds to the flange is equipped with the depressed area being recessed inwardly, and the flange is fitted in described recessed It falls on the side surface in area;Mounting groove is formed between the depressed area and the upper surface of the shell, is equipped in the mounting groove close Bullet circle is sealed, the sealing plays snare in the outside of the flange.
2. minitype acoustic generator according to claim 1, which is characterized in that the upper surface of the fixed part and the side wall It is adhesively fixed between lower end surface by glue-line, it is viscous by glue-line between the lower surface of the fixed part and the upper surface of the shell Fixation is connect, is adhesively fixed between the flange and the outer surface of the side wall by glue-line.
3. minitype acoustic generator according to claim 1, which is characterized in that between the flange and the outer surface of the side wall It is fixed by laser welding.
4. minitype acoustic generator according to claim 1, which is characterized in that the outer surface of the side wall, the sealing bullet circle Outer surface and the outer surface three of the side wall of outer shell flush.
5. according to claim 1 to minitype acoustic generator described in 4 any claims, which is characterized in that the middle part of the front cover Injection molding is combined with steel disc.
6. according to claim 1 to minitype acoustic generator described in 4 any claims, which is characterized in that the magnetic circuit system packet Magnetic yoke is included, the center of the magnetic yoke is successively fixed with internal magnet and interior magnetic conductive board, and the marginal position of the magnetic yoke is successively solid Surely there are external magnet and outer magnetic conductive board.
7. minitype acoustic generator according to claim 6, which is characterized in that the outer edge of the outer magnetic conductive board is located at described outer The outer peripheral inside of magnet, the inside of the shell are equipped with the positioning region of hierarchic structure, the positioning region and the outer magnetic conduction The outer edge structure of plate and the external magnet is adapted.
CN201710170295.0A 2017-03-21 2017-03-21 Minitype acoustic generator Active CN106954149B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710170295.0A CN106954149B (en) 2017-03-21 2017-03-21 Minitype acoustic generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710170295.0A CN106954149B (en) 2017-03-21 2017-03-21 Minitype acoustic generator

Publications (2)

Publication Number Publication Date
CN106954149A CN106954149A (en) 2017-07-14
CN106954149B true CN106954149B (en) 2019-10-08

Family

ID=59472744

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710170295.0A Active CN106954149B (en) 2017-03-21 2017-03-21 Minitype acoustic generator

Country Status (1)

Country Link
CN (1) CN106954149B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110418259A (en) * 2018-04-27 2019-11-05 歌尔股份有限公司 Sounding device monomer, sounding module and electric terminal
CN110248295B (en) * 2019-06-27 2021-02-19 歌尔股份有限公司 Sound production device and electronic equipment
WO2021000096A1 (en) * 2019-06-29 2021-01-07 瑞声声学科技(深圳)有限公司 Speaker
CN111464924A (en) * 2019-12-25 2020-07-28 瑞声科技(新加坡)有限公司 Sound generator

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002223494A (en) * 2001-01-25 2002-08-09 Citizen Electronics Co Ltd Speaker
JP2008141317A (en) * 2006-11-30 2008-06-19 Sanyo Electric Co Ltd Speaker
JP2011142502A (en) * 2010-01-07 2011-07-21 Hosiden Corp Compact loudspeaker
CN204231661U (en) * 2014-11-25 2015-03-25 歌尔声学股份有限公司 A kind of loud speaker
CN105704625A (en) * 2014-12-15 2016-06-22 易音特电子株式会社 Slim microspeaker
CN205622868U (en) * 2016-04-06 2016-10-05 歌尔股份有限公司 Speaker monomer structure
CN106257937A (en) * 2016-04-29 2016-12-28 歌尔股份有限公司 A kind of sound-producing device and the preparation method of metal plastic part

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10123121B2 (en) * 2015-01-09 2018-11-06 Sony Corporation Water proof speaker device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002223494A (en) * 2001-01-25 2002-08-09 Citizen Electronics Co Ltd Speaker
JP2008141317A (en) * 2006-11-30 2008-06-19 Sanyo Electric Co Ltd Speaker
JP2011142502A (en) * 2010-01-07 2011-07-21 Hosiden Corp Compact loudspeaker
CN204231661U (en) * 2014-11-25 2015-03-25 歌尔声学股份有限公司 A kind of loud speaker
CN105704625A (en) * 2014-12-15 2016-06-22 易音特电子株式会社 Slim microspeaker
CN205622868U (en) * 2016-04-06 2016-10-05 歌尔股份有限公司 Speaker monomer structure
CN106257937A (en) * 2016-04-29 2016-12-28 歌尔股份有限公司 A kind of sound-producing device and the preparation method of metal plastic part

Also Published As

Publication number Publication date
CN106954149A (en) 2017-07-14

Similar Documents

Publication Publication Date Title
CN106954149B (en) Minitype acoustic generator
CN104540080B (en) Loudspeaker module
JP3979334B2 (en) Piezoelectric electroacoustic transducer
JP3489509B2 (en) Electroacoustic transducer
US10932054B2 (en) Sound device
JP3988672B2 (en) Piezoelectric electroacoustic transducer and manufacturing method thereof
CN204291372U (en) Microspeaker
WO2017000504A1 (en) Miniature loudspeaker
JP2004015768A (en) Piezoelectric electroacoustic transducer
CN108322869A (en) Microphone device
WO2011080877A1 (en) Speaker diaphragm, and speaker and handheld terminal device using said speaker diaphragm
WO2016176981A1 (en) Loudspeaker module
WO2019184477A1 (en) Sound production apparatus and electronic device
JP3882890B2 (en) Piezoelectric electroacoustic transducer
CN109032257B (en) Electronic display device and electronic device
CN105340291A (en) Bone conduction speaker unit
CN109151673A (en) Microphone device
CN206908833U (en) Minitype acoustic generator
CN106331961A (en) Micro acoustic generator
CN209390336U (en) A kind of loudspeaker
WO2020029635A1 (en) Micro sound production device
CN206596221U (en) Minitype acoustic generator
CN109121051A (en) Microphone device
JP3669431B2 (en) Piezoelectric electroacoustic transducer
CN206042358U (en) Miniature sounder

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant