CN201160322Y

CN201160322Y - Dustproof microphone

Info

Publication number: CN201160322Y
Application number: CNU2008200924353U
Authority: CN
Inventors: 周成军
Original assignee: AAC Acoustic Technologies Shenzhen Co Ltd
Current assignee: AAC Technologies Holdings Shenzhen Co Ltd
Priority date: 2008-02-29
Filing date: 2008-02-29
Publication date: 2008-12-03
Anticipated expiration: 2018-02-28

Abstract

The utility model provides a dustproof microphone, which comprises a housing provided with a sound inlet hole at the bottom and a back pole plate that is arranged in the housing and propped at the bottom of the housing, the back pole plate is provided with a sound passage hole that is not overlapped with the sound inlet hole, one face of the back pole plate bonded with the bottom surface of the housing is provided with a sound guide groove that is perforated each other but not perforated through the back pole plate. The sound guide groove is used to guide the sound source entering from the sound inlet into the sound passage hole on the back pole plate. Compared with the prior art, the dustproof microphone does not need to add a waterproof net, and is suitable for workmanship requirement of SMT technique, and has the advantages of good dustproof effect, good product performance and low cost.

Description

Dustproof microphone

[technical field]

The utility model relates to a kind of microphone, especially a kind of dustproof electret microphone.

[background technology]

Development along with wireless telecommunications, Global Mobile Phone Users is more and more, the user not only is satisfied with conversation to the requirement of mobile phone, and want high-quality communication effect can be provided, especially at present the development of mobile multimedia technology, the speech quality of mobile phone becomes more important, and the microphone of mobile phone is as the voice pick device of mobile phone, and its design quality directly influences speech quality.

The electret microphone 10 of dependency structure as shown in Figure 5, the back pole plate 12 that comprises shell 11, is contained in the shell 11 and is separated by with outer casing bottom, pad 13, and vibrating diaphragm group 14 that by pad 13 separated relative, dead ring 15, the connecting ring 16 and the circuit board 17 of electric connection vibrating diaphragm group 14 in order to accommodate vibrating diaphragm group 14 with back pole plate 12.Shell 11 is provided with into sound hole 110 accepting outside sound source, and the back pole plate 12 adjacent with shell is provided with continuant orifice 120 to accept the sound source that sound hole is come in of going into from the shell, to realize promoting vibrating diaphragm group 14 vibrations on back pole plate 12 opposites.

When influencing the performance of microphone for stoping particles such as extraneous dust to enter into microphone inside, traditional precautionary measures are to paste one deck Air Filter 18 at the outer surface of microphone 10 shells 11.Though this measure can reach particles such as stoping extraneous dust and enter into microphone inside, but increased the manufacturing process flow of microphone, and expended employee's the extensive work time, thereby caused increasing the manufacturing cost of microphone products.

In addition, present microphone is just progressively to the manufacturing technique requirent transition of satisfying compatible surface mounting technology (SMT), and can not bear the reflow soldering high temperature that exists in the production technology of compatible surface mounting technology in the Air Filter material that outer surface of outer cover is pasted; And the suction operation in the production process of the compatible surface mounting technology of influence.Therefore, at present, the SMD microphone of compatible surface mount device all can not be pasted one deck Air Filter at the outer surface of shell.Yet, there is not this Air Filter, product particle such as extraneous dust all can occur and enter into product inside in the technical process of Reflow Soldering and in the use, thus the problem that causes properties of product to descend.

Therefore, be necessary to study a kind of novel microphone that can reach the good dust-proof effect.

[utility model content]

The technical problem that the utility model need solve is to overcome above-mentioned the deficiencies in the prior art, provides a kind of good dustproof effect, cost is low and well behaved dustproof microphone.

According to the above-mentioned technical solution problem that needs, designed a kind of dustproof microphone, comprise the back pole plate that the bottom is provided with the shell of tone-entering hole and is located in the shell and connects with outer casing bottom, sound hole that described back pole plate is provided with and described tone-entering hole are not overlapping, and be that the one side of fitting in described back pole plate and outer casing bottom surface is provided with mutual perforation but do not run through the groove of leading of back pole plate.

Further improve as the utility model, the groove of leading of described mutual perforation constitutes for the some straightway grooves that intersect.

Back pole plate of the present utility model and shell are fitted, and both sound holes are not overlapping, i.e. misalignment enters into product inside in order to prevent particles such as extraneous dust; Simultaneously, the groove of leading that is provided with on back pole plate imports in the sound hole of back pole plate in order to the outside sound source that will enter from the tone-entering hole on the shell, thereby realizes making the vibrating diaphragm group vibration on back pole plate opposite.Compared with prior art, the utility model need not add one deck Air Filter, and the technological requirement of suitable surface mounting technology (SMT), has good dustproof effect, good product performance, advantage that cost is low.

[description of drawings]

Fig. 1 is the three-dimensional exploded view of the dustproof microphone of the utility model;

Fig. 2 is the schematic perspective view of the dustproof microphone of the utility model;

Fig. 3 is the cross-sectional schematic of the dustproof microphone of the utility model;

Fig. 4 is the front view that back pole plate is provided with the one side of logical sound groove in the dustproof microphone of the utility model;

Fig. 5 is the cross-sectional schematic of dependency structure electret microphone.

[embodiment]

The utility model is described in further detail below in conjunction with drawings and embodiments.

As Fig. 1, Fig. 2 and shown in Figure 3, the dustproof microphone 20 of the utility model comprises shell 21, links to each other with shell 21 and forms with it the circuit pcb board 27 of a cavity volume 200.Be provided with a dead ring 25 in this cavity volume 200, the connecting ring 26 that contains the back pole plate 22 of fitting, pad 23, and vibrating diaphragm group 24 that by pad 23 separated relative in the dead ring 25, links to each other and both are electrically conducted with circuit pcb board 27 with vibrating diaphragm group 24 with back pole plate 22 with shell 21 lower surface.

Shell 21 bottoms are provided with tone-entering hole 210, to accept outside sound source.

Back pole plate 22 is a kind of dielectrics that can keep the electric polarization state for a long time, and this dielectric is a kind of high molecular polymer, is distributed with free charge on the back pole plate 22.Back pole plate 22 is provided with sound hole 220, and tone-entering hole 210 misalignment on sound hole 220 and the shell 21 promptly do not overlap, and enter product inside to prevent particles such as extraneous dust.As shown in Figure 4, the one side that back pole plate 22 and shell 21 lower surface are fitted is provided with leads groove 221, leads groove 221 and is made of some straightway grooves that intersect, and the straightway groove connects mutually, but does not run through back pole plate 22.Because the straightway groove connects mutually, so even sound hole and tone-entering hole are not overlapping, the sound source that enters from tone-entering hole also can enter on the back pole plate in the sound hole by leading groove 221, vibrates thereby realize promoting vibrating diaphragm group 24.

The dustproof microphone 20 of this structure, back pole plate 22 electrically connects circuit pcb board 27 by shell 21, and vibrating diaphragm group 24 electrically connects circuit pcb board 27 by connecting ring 26, and separates not conducting by pad 23 between diaphragm group 24 and the back pole plate 22.By above-mentioned electrical connection and not conducting relation, can realize capacity effect between back pole plate 22 and the diaphragm group 24.Owing to be distributed with free charge on the back pole plate 24, the quantity of electric charge just arranged between the two poles of the earth of capacitor.Sound wave enters from the tone-entering hole 210 of shell 21, import in the continuant orifice 210 that enters on the back pole plate 22 by leading groove 221 again, thereby make diaphragm group 24 vibration and when producing displacement, changed the capacitance of capacitor, the change of capacitance makes the output of capacitor produce corresponding alternating electric field, just formed the signal of telecommunication corresponding, so just finished the function of acoustic-electric conversion with acoustic signals.

Compared with prior art, the utility model need not add one deck Air Filter, and the technological requirement of suitable surface mounting technology (SMT), has good dustproof effect, good product performance, advantage that cost is low.

Above-described only is the utility model preferred implementation; should be pointed out that for the person of ordinary skill of the art at this, under the prerequisite that does not break away from the utility model creation design; can also make improvement, but these all belong to protection range of the present utility model.

Claims

1, a kind of dustproof microphone, comprise the back pole plate that the bottom is provided with the shell of tone-entering hole and is located in the shell and connects with outer casing bottom, sound hole that described back pole plate is provided with and described tone-entering hole are not overlapping, it is characterized in that: that the one side of fitting in described back pole plate and outer casing bottom surface is provided with mutual perforation but do not run through the groove of leading of back pole plate.

2, dustproof microphone according to claim 1 is characterized in that: the groove of leading of described mutual perforation constitutes for the some straightway grooves that intersect.