CN103533472A

CN103533472A - Front cavity structure of micro-receiver with acoustic filter

Info

Publication number: CN103533472A
Application number: CN201310476572.2A
Authority: CN
Inventors: 韦惠星
Original assignee: ZHONGSHAN TIANJIAN ELECTROACOUSTIC CO Ltd
Current assignee: ZHONGSHAN TIANJIAN ELECTROACOUSTIC CO Ltd
Priority date: 2013-10-12
Filing date: 2013-10-12
Publication date: 2014-01-22

Abstract

The invention discloses a front cavity structure of a micro-receiver with an acoustic filter, which comprises a front cavity body arranged in the front end of the micro-receiver, the front cavity body is of a shell structure, the upper end of the front cavity body is provided with a plurality of sound holes, and a resonant cavity structure is arranged in the front cavity body. The sound stream produced by the vibration of a diaphragm of the micro-receiver is divided into two branches, one branch is transmitted into the front cavity of the earphone via the sound holes, and the other branch enters the resonant cavity structure. The resonant frequency of the resonant cavity structure is set as a frequency band to be notched, the set frequency band can be notched by the resonant cavity structure, consequently, the formants of the earphone at high frequency can be effectively controlled, and the resolution of the earphone at high frequency can be improved.

Description

Front cavity configuration with the micro-telephone receiver of acoustic filter

Technical field

The present invention relates to a kind of front cavity configuration of the micro-telephone receiver with acoustic filter.

Background technology

Owing to there is duct resonance, earphone usually reveals the formant of high-quality-factor at a certain band table of high frequency, thereby earphone is sounded sharply, imbalance.Eliminating formant is generally to adopt the way that increases damping, but the formant in the more restive arrowband of damped method causes the high frequency of earphone to resolve power deficiency.

Summary of the invention

In order to overcome the deficiencies in the prior art, the invention provides a kind of front cavity configuration of the micro-telephone receiver with acoustic filter.

The technical solution adopted for the present invention to solve the technical problems is:

Front cavity configuration with the micro-telephone receiver of acoustic filter, comprise and be arranged on the ante-chamber body that is subject to sound device front end, described ante-chamber body is a shell structure, and its upper end offers some phonate holes, is provided with and can carries out to setting frequency range the acoustic filter of trap in described ante-chamber body.

Described acoustic filter is a structure of resonant cavity, and this structure of resonant cavity can be set resonance frequency according to the frequency range of required trap.

Described structure of resonant cavity comprises that indent is arranged on the intrinsic cavity of ante-chamber and mounts cover the protecgulum on this cavity, offers the through hole that is communicated with cavity on described protecgulum.

Described cavity is for being arranged on the intrinsic toroidal cavity of ante-chamber, and described protecgulum is the loop configuration corresponding with cavity.

Described structure of resonant cavity comprises that indent is arranged on the diaphragm of the intrinsic cavity of ante-chamber and covering cavity.

In described cavity, offer the leak holes that is communicated with ante-chamber body exterior.

The invention has the beneficial effects as follows: described ante-chamber body is a shell structure, its upper end offers some phonate holes, in described ante-chamber body, be provided with structure of resonant cavity, the acoustic streaming that the vibration of receiver vibrating film causes is divided into two, one is delivered in earphone ante-chamber through phonate hole, another enters structure of resonant cavity, the resonance frequency of this structure of resonant cavity is set to the frequency range that we need trap, by this structure of resonant cavity, can carry out trap to setting frequency range, effectively control earphone at the formant of high frequency, improve earphone and resolve power at high frequency.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 is the generalized section of first embodiment of the invention;

Fig. 2 is profile after the assembling of Fig. 1 embodiment;

Fig. 3 is the structural representation of Fig. 1 embodiment;

Fig. 4 is the acoustic-electric equivalent circuit diagram of Fig. 1 embodiment;

Fig. 5 is the earphone curve chart of Fig. 1 embodiment;

Fig. 6 is the generalized section of second embodiment of the invention;

Fig. 7 is the acoustic-electric equivalent circuit diagram of Fig. 6 embodiment.

Embodiment

Referring to figs. 1 through Fig. 5, Fig. 1 to Fig. 5 is the structural representation of first specific embodiment of the present invention, as shown in the figure, front cavity configuration with the micro-telephone receiver of acoustic filter, comprise and be arranged on the ante-chamber body 1 that is subject to sound device front end, described ante-chamber body 1 is a shell structure, its upper end offers some phonate holes 2, in described ante-chamber body 1, be provided with the acoustic filter of a structure of resonant cavity, this structure of resonant cavity can be set resonance frequency according to the frequency range of required trap, by this structure of resonant cavity, can carry out trap to setting frequency range.

In the embodiment of Fig. 1 to Fig. 5, described structure of resonant cavity comprises that indent is arranged on the toroidal cavity 3 in ante-chamber body 1 and mounts cover the protecgulum 4 on this cavity 3, on described protecgulum 4, offer the through hole 41 that is communicated with cavity 3, make ante-chamber body 1 form a Helmholtz structure of resonant cavity, as shown in Figure 2, the acoustic streaming line that the vibration of the vibrating diaphragm 91 of receiver 9 causes is divided into two, one is delivered in earphone ante-chamber through phonate hole 2, another flows into cavity 3 by through hole 41, and in the interior generation resonance of cavity 3, the resonance band of setting is carried out to trap, to control earphone at the formant of high frequency, improve earphone and resolve power at high frequency.

As Fig. 4, shown in Fig. 5, Fig. 4 is the acoustic-electric equivalent circuit diagram of first specific embodiment of the present invention, phonate hole 2 for acoustic load be Zload, through hole 41 can be regarded acoustic mass Mal and acoustic resistance Ral series connection as, cavity 3 can be regarded an acoustic capacitance Cav as, by in parallel by acoustic mass Mal on acoustic load Zload, acoustic resistance Ral, the filter that acoustic capacitance Cav is in series, the wave band of setting is carried out to trap, can control earphone at the formant of high frequency, improve earphone and resolve power at high frequency, Fig. 5 is typical In-Ear Headphones curve, wherein dotted line is not for adding the curve before filter construction, solid line is that the present invention has added filter construction curve afterwards, known in figure, the present invention can effectively eliminate earphone at the formant of high frequency treatment, improve earphone and resolve power at high frequency, because earphone is to people's ear radiation sound through duct, be easy to form pipeline resonance, cause the high frequency of earphone to resolve power deficiency, the present invention can overcome this difficulty easily, we only need to adjust the volume of cavity 3 and the size of through hole 41 (aperture and length) just both can be controlled the resonance point of trapper, can control again bandwidth and the degree of depth of trapper, further, also can in cavity 3, offer the leak holes that is communicated with ante-chamber body 1 outside, to regulate the quality factor of filter.

With reference to Fig. 6, Fig. 7, according to Fig. 6, Fig. 7 is the structural representation of second specific embodiment of the present invention, as shown in the figure, described structure of resonant cavity comprises that indent is arranged on cavity 3 in ante-chamber body 1 and covers the diaphragm 5 of cavity 3, this diaphragm 5 can pass through for the sound wave of special frequency channel, the acoustic streaming line that the vibration of the vibrating diaphragm 91 of receiver 9 causes is divided into two, one is delivered in earphone ante-chamber through phonate hole 2, another enters cavity 3 by diaphragm 5, and in the interior generation resonance of cavity 3, the resonance band of setting is carried out to trap, to control earphone at the formant of high frequency, improve earphone and resolve power at high frequency, Fig. 7 is the acoustic-electric equivalent circuit diagram of the present embodiment, phonate hole 2 for acoustic load be Zload, diaphragm 5 can be regarded acoustic resistance Ram as, acoustic mass Mam and acoustic compliance Cam series connection, cavity 3 can be regarded an acoustic capacitance Cav as, by in parallel by acoustic resistance Ram on acoustic load Zload, acoustic mass Mam, acoustic compliance Cam, the filter that acoustic capacitance Cav is in series, the wave band of setting is carried out to trap, can control earphone at the formant of high frequency, improve earphone and resolve power at high frequency, Fig. 5 is typical In-Ear Headphones curve, wherein dotted line is not for adding the curve before filter construction, solid line is that the present invention has added filter construction curve afterwards, known in figure, the present invention can effectively eliminate earphone at the formant of high frequency treatment, improve earphone and resolve power at high frequency, we only need the adjustment volume of cavity 3 and the size of diaphragm 5 (shape and thickness) just both can control the resonance point of trapper in the present embodiment, can control again bandwidth and the degree of depth of trapper, further, also can in cavity 3, offer the leak holes that is communicated with ante-chamber body 1 outside, to regulate the quality factor of filter.

Above better enforcement of the present invention is illustrated; certainly; the present invention can also adopt form different from the embodiment described above; the conversion being equal to that those of ordinary skill in the art do under the prerequisite without prejudice to spirit of the present invention or accordingly change, all should belong in protection scope of the present invention.

Claims

1. with the front cavity configuration of the micro-telephone receiver of acoustic filter, comprise and be arranged on the ante-chamber body (1) that is subject to sound device front end, it is characterized in that: described ante-chamber body (1) is a shell structure, its upper end offers some phonate holes (2), is provided with and can carries out to setting frequency range the acoustic filter of trap in described ante-chamber body (1).

2. the front cavity configuration of the micro-telephone receiver with acoustic filter according to claim 1, is characterized in that: described acoustic filter is a structure of resonant cavity, and this structure of resonant cavity can be set resonance frequency according to the frequency range of required trap.

3. the front cavity configuration of the micro-telephone receiver with acoustic filter according to claim 2, it is characterized in that: described structure of resonant cavity comprises that indent is arranged on the cavity (3) in ante-chamber body (1) and mounts cover the protecgulum (4) on this cavity (3), offers the through hole (41) that is communicated with cavity (3) on described protecgulum (4).

4. the front cavity configuration of the micro-telephone receiver with acoustic filter according to claim 3, is characterized in that: for to be arranged on the toroidal cavity in ante-chamber body (1), described protecgulum (4) is the loop configuration corresponding with cavity (3) to described cavity (3).

5. the front cavity configuration of the micro-telephone receiver with acoustic filter according to claim 2, is characterized in that: described structure of resonant cavity comprises that indent is arranged on the diaphragm (5) of the interior cavity (3) of ante-chamber body (1) and covering cavity (3).

6. according to the front cavity configuration of the micro-telephone receiver with acoustic filter described in claim 2 or 5, it is characterized in that: in described cavity (3), offer and be communicated with the outside leak holes of ante-chamber body (1).