CN209964300U - High-fidelity large-vibration-membrane electret microphone - Google Patents

Abstract

The utility model discloses a big vibrating diaphragm electret microphone of high-fidelity, including metal casing, dustproof diaphragm, electret main part, metal back of the body electrode and field effect transistor, metal casing's inside has the electret main part through first slot fixed mounting, metal casing's inside has metal back of the body electrode through second slot fixed mounting, the central point department fixed mounting of metal back of the body electrode one side has the field effect transistor. The utility model discloses set up the impedance converter, install the impedance converter on the field effect transistor, the impedance converter can resist and hinder and carry out effectual subducting, thereby can receive the condition that the resistance caused the sound distortion at the in-process of transmission electric wave to avoiding the pin, this big vibrating diaphragm electret microphone of high-fidelity has set up the arc piece that shakes, the inside arc piece that shakes that is equipped with of electret main part, the arc piece that shakes can effectual expansion electret main part's range of vibration, produce great vibration wave, thereby can effectually transmit the sound wave.

Description

High-fidelity large-vibration-membrane electret microphone

Technical Field

The utility model relates to an electret microphone technical field specifically is a big vibrating diaphragm electret microphone of high-fidelity.

Background

The electret microphone is a condenser microphone in which a polarization power supply is replaced with an electret that is polarized by injecting electric charges in advance. Electret microphones are of two types, one is to use electret polymer film material as a vibrating diaphragm (vibration mode), and the vibrating diaphragm is simultaneously responsible for the double tasks of sound wave receiving and polarization voltage; the other is that the back polar plate (back polar type) is made of electret material, and it only plays the role of polarization voltage, because the microphone does not need polarization voltage, the structure is simplified, and because its electroacoustical characteristic is good, it has gradually replaced the microphone with external polarization voltage in recording and amplifying sound and outdoor noise measurement.

The existing electret microphone has the following defects: 1. the impedance is very high in the process of sound transmission, so that the sound distortion is easily caused; 2. the electret vibration frequency in the existing electret microphone is relatively small, so that the transmission effect of sound waves is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a big vibrating diaphragm electret microphone of high-fidelity to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a big vibrating diaphragm electret microphone of high-fidelity, includes metal casing, dustproof diaphragm, electret main part, metal back of the body electrode and field effect transistor, metal casing's inside has the electret main part through first slot fixed mounting, metal casing's inside has metal back of the body electrode through second slot fixed mounting, the central point department fixed mounting of metal back of the body electrode one side has the field effect transistor, one side fixed mounting of metal casing has dustproof diaphragm.

Preferably, the electret main part's inside is equipped with the recess, and the inside of recess has the arc piece of shaking through fixed block fixed mounting.

Preferably, an impedance converter is fixedly mounted on one side of the field effect transistor, and pins are fixedly mounted at two ends of the impedance converter.

Preferably, the surface of the metal back electrode is provided with a first sound hole, and the guide rod is fixedly installed at the central position of one side of the metal back electrode.

Preferably, a second sound hole is formed in the center of one side of the metal shell, metal gaskets are arranged on one sides of the inner top and the inner bottom of the metal shell, plastic gaskets are fixedly mounted in the center of the inner top and the inner bottom of the metal shell, and plastic supports are fixedly mounted on one sides, far away from the metal gaskets, of the inner top and the inner bottom of the metal shell.

Preferably, one side of the metal shell, which is far away from the dustproof diaphragm, is embedded with an insulating embedded sheet, and one side of the insulating embedded sheet is fixedly provided with a single-side copper clad plate.

Compared with the prior art, the beneficial effects of the utility model are that: this big vibrating diaphragm electret microphone of high-fidelity has set up the impedance converter, install the impedance converter on the field effect transistor, the impedance converter can resist and hinder and carry out effectual subducting, thereby can receive the anti-condition that hinders and cause the sound distortion at the in-process of transmission electric wave to avoiding the pin, this big vibrating diaphragm electret microphone of high-fidelity has set up the arc piece that shakes, the inside arc piece that shakes that is equipped with of electret main part, the arc piece that shakes can effectual expansion electret main part's vibration amplitude, produce great vibration wave, thereby can effectually transmit the sound wave.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the main body of the electret of the present invention;

FIG. 3 is a structural diagram of the field effect transistor of the present invention;

fig. 4 is a structural diagram of the metal back electrode of the present invention;

fig. 5 is a structural view of the metal casing of the present invention.

In the figure: 1. a metal housing; 101. a second sound hole; 102. a metal washer; 103. a first slot; 104. a plastic gasket; 105. a second slot; 106. a plastic support; 2. a dust-proof diaphragm; 3. an electret main body; 301. a groove; 302. an arc-shaped vibrating sheet; 303. a fixed block; 4. a metal back electrode; 401. a first sound hole; 402. a guide bar; 5. a field effect transistor; 501. an impedance transformer; 502. a pin; 6. an insulating insert; 7. a single-side copper clad plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-5, the present invention provides an embodiment: a high-fidelity large-vibrating-diaphragm electret microphone comprises a metal shell 1, a dustproof diaphragm 2, an electret main body 3, a metal back electrode 4 and a field effect tube 5, wherein the electret main body 3 is fixedly arranged in the metal shell 1 through a first slot 103, the metal back electrode 4 is fixedly arranged in the metal shell 1 through a second slot 105, a capacitor is formed between the electret main body 3 and the metal back electrode 4, when a vibrating film of the electret main body 3 vibrates through sound waves, voltage changes at two ends of the capacitor are caused, thereby produced the audio voltage along with the sound wave change, metal back electrode 4 one side central point department has field effect transistor 5 through guide arm 402 fixed mounting, and field effect transistor 5 connects into source output circuit (generally all with 3DJ type), and metal casing 1's one side welding has dustproof diaphragm 2, and dustproof diaphragm 2 shelters from external dust, avoids the dust to enter into metal casing 1 inside.

Further, the inside of electret main part 3 is equipped with recess 301, and there is arc piece 302 that shakes the inside of recess 301 through fixed block 303 fixed mounting, and arc piece 302 shakes and enlarges the vibration range of electret main part 3 at the effect of sound wave to can carry out effectual transmission to the sound wave.

Further, an impedance converter 501 is welded on one side of the field effect tube 5, the impedance converter 501 can reduce impedance and prevent an output circuit of the pin 502 from being affected, the pins 502 are welded on two ends of the impedance converter 501, the pin 502 extends to the outside of the metal shell 1 through the single-side copper clad plate 7, and the pin 502 outputs voltage change caused by sound waves.

Further, the surface of the metal back electrode 4 is provided with a first sound hole 401, the sound wave passes through the first sound hole 401 to avoid causing the sound wave to return, a guide rod 402 is welded at the central position of one side of the metal back electrode 4, and the guide rod 402 conducts the changed voltage to the field effect tube 5.

Further, the central position department of metal casing 1 one side is equipped with second sound hole 101, outside sound wave enters into metal casing 1 inside through second sound hole 101, top and one side of interior bottom are equipped with metal gasket 102 in the metal casing 1, electret main body 3 receives the pressure of sound wave and produces the vibration, metal gasket 102 with electret main body 3 together then begins to move in the magnetic field, according to faraday's lenz law, the coil can produce induced current, metal casing 1 interior top and interior bottom central position department bond have plastic gasket 104, plastic gasket 104 insulates electret main body 3 and metal back electrode 4, metal casing 1 interior top and interior bottom keep away from one side welding of metal gasket 102 have plastics support 106, pin 502 is fixed through plastic support 106.

Further, an insulating embedded sheet 6 is embedded and installed on one side, away from the dustproof diaphragm 2, of the metal shell 1, the insulating embedded sheet 6 is used for insulating and sealing one side of the metal shell 1, a single-face copper clad plate 7 is welded on one side of the insulating embedded sheet 6 of the metal shell 1, and the single-face copper clad plate 7 is used for enabling a copper foil with a certain thickness to firmly cover the insulating embedded sheet 6 through bonding and hot extrusion processes and is used for enabling the pins 502 to pass through.

The working principle is as follows: a capacitor is formed between an electret main body 3 and a metal back electrode 4 in a metal shell 1, external sound waves enter the metal shell 1 through a second sound hole 101, the electret main body 3 vibrates under the pressure of the sound waves, a metal gasket 102 which is together with the electret main body 3 starts to move in a magnetic field, a coil can generate induction current according to the Lenz's law of Faraday, when the sound waves enable a vibrating film of the electret main body 3 to vibrate, voltage change at two ends of the capacitor is caused, audio voltage changing along with the sound waves is generated, the audio voltage is connected into a source output circuit through a field effect tube 5 (generally, a 3DJ type is used), and the output circuit outputs the audio voltage through a pin 502.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (6)

1. The utility model provides a high-fidelity large-vibrating diaphragm electret microphone, includes metal casing (1), dust diaphragm (2), electret main part (3), metal back electrode (4) and field effect transistor (5), its characterized in that: the inside of metal casing (1) has electret main part (3) through first slot (103) fixed mounting, there is metal back electrode (4) inside of metal casing (1) through second slot (105) fixed mounting, the central point department fixed mounting of metal back electrode (4) one side has field effect transistor (5), one side fixed mounting of metal casing (1) has dust diaphragm (2).

2. The high-fidelity large-diaphragm electret microphone of claim 1, wherein: the electret is characterized in that a groove (301) is formed in the electret main body (3), and an arc-shaped vibrating piece (302) is fixedly mounted in the groove (301) through a fixing block (303).

3. The high-fidelity large-diaphragm electret microphone of claim 1, wherein: an impedance converter (501) is fixedly mounted on one side of the field effect tube (5), and pins (502) are fixedly mounted at two ends of the impedance converter (501).

4. The high-fidelity large-diaphragm electret microphone of claim 1, wherein: the surface of the metal back electrode (4) is provided with a first sound hole (401), and a guide rod (402) is fixedly installed at the central position of one side of the metal back electrode (4).

5. The high-fidelity large-diaphragm electret microphone of claim 1, wherein: the loudspeaker is characterized in that a second sound hole (101) is formed in the central position of one side of the metal shell (1), a metal gasket (102) is arranged on one side of the inner top and the inner bottom of the metal shell (1), a plastic gasket (104) is fixedly mounted at the central position of the inner top and the inner bottom of the metal shell (1), and a plastic support (106) is fixedly mounted on one side, far away from the metal gasket (102), of the inner top and the inner bottom of the metal shell (1).

6. The high-fidelity large-diaphragm electret microphone of claim 1, wherein: one side of the metal shell (1) far away from the dustproof diaphragm (2) is embedded with an insulating embedded sheet (6), and one side of the insulating embedded sheet (6) is fixedly provided with a single-side copper clad plate (7).

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