WO2013044548A1

WO2013044548A1 - Moving iron type microphone unit

Info

Publication number: WO2013044548A1
Application number: PCT/CN2011/082073
Authority: WO
Inventors: 周巍
Original assignee: 苏州恒听电子有限公司
Priority date: 2011-09-23
Filing date: 2011-11-11
Publication date: 2013-04-04
Also published as: CN103024647A

Abstract

Disclosed is a moving iron type microphone unit with an improved structure used in a bone-conduction hearing aid and a loudspeaker, comprising an electromagnetic shielding shell, an armature, a diaphragm, a vibration conducting apparatus, a magnetic iron core, a magnet sheet, and an electromagnetic induction coil, being characterized in that: the armature, the magnetic iron core, the magnet sheet and the electromagnetic induction coil are fixedly connected in a manner of welding of resistor, laser or ultrasonic wave and bonding of adhesive, to form a driving magnet mechanism, and the magnetic iron core in the driving magnet mechanism and the diaphragm are fixedly connected. In the present invention, the driving magnet mechanism is designed as a part of the diaphragm by utilizing the mass of the driving magnet mechanism, thereby simplifying weight increasing modules positioned outside the traditional diaphragm, optimizing the mechanical structure of the product, and increasing the utilization rate of the space, so the structure is more impact and firmer.

Description

Moving iron microphone unit

The present invention relates to an electromagnetic shielding device, and more particularly to an electromagnetic shielding device applied to a micro-microphone device such as a hearing aid, and belongs to the field of electroacoustics and micro-mechanics.

Background technique

At present, the electromagnetic shielding shell used in the microphones for hearing aids on the market generally adopts the docking type. When using, the upper and lower boxes are butt-joined by laser or electric resistance welding, and the magnetic core coil of the microphone is enclosed therein to form a complete electromagnetic Shield the case. In the manufacturing process, a method of stretching, cutting, and secondary processing is employed. However, the existing electromagnetic shielding shell generally has incomplete electromagnetic shielding, high electromagnetic radiation, complicated combined welding process, and the electromagnetic shielding performance of the product is greatly affected by the process; further, the existing shielding shell (see Figure 1-3) The mechanical structure design of the sound outlet determines that it can only be stretched first, and is manufactured by the secondary processing method, which has high cost and high process difficulty.

Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to provide a microphone electromagnetic shielding case for a hearing aid, which can effectively improve the electromagnetic shielding performance of the microphone, and has better manufacturability and cost advantages, thereby overcoming the deficiencies in the prior art.

In order to achieve the above object, the present invention adopts the following technical solutions:

A microphone electromagnetic shielding case for a hearing aid, comprising a housing and a bottom box, the housing being combined with the bottom box by a nesting manner, characterized in that: the core coil combination of the microphone The part and the diaphragm part are both placed in the bottom case, and the outer casing and the bottom case are mechanically designed to be in a sliding fit, and the two parts are used in a nested manner.

Further, the bottom of the claimed core coil is fixedly connected to the inner wall of the iron box, and at the same time, the diaphragm is fixed to the open end edge of the bottom box.

There is a sliding fit combination between the shell and the bottom box.

The sound box slot and the signal line slot are also provided on the outer casing of the complaint, and are used for the sound outlet and the signal line outlet of the microphone.

In addition, the shell and the bottom case are formed by stretching and punching.

The outer shape of the outer casing and the bottom box are rectangular, square or round.

The advantages of the present invention over the prior art are:

(1) In view of the defects existing in the docking type of the existing magnetic shield shell design, the present invention adopts a nested structure instead of the shell of the conventional docking structure, and can ensure the product sound quality is unchanged, greatly improving the product. Electromagnetic shielding performance;

(2) The use of sliding fit combination, compared with the traditional laser or resistance welding requirements of the process, greatly improving the manufacturability of the related microphone products, reducing the difficulty of the process;

(3) The design of the convenient drawing and punching forming process is adopted, which makes the manufacturing process of the magnetic shielding shell more convenient and lower in cost.

DRAWINGS

1 is a schematic view of a conventional shielded shell docking structure;

2 is a schematic cross-sectional view of a conventional shielded shell docking structure;

3 is a schematic structural view of a sound outlet of a conventional shield case;

4 is a schematic cross-sectional structural view of a microphone electromagnetic shielding case for a hearing aid according to the present invention; Figure 5 is a top plan view of a microphone electromagnetic shielding case for a hearing aid of the present invention;

Figure 6 is a front elevational view of the electromagnetic shielding case of the microphone for the hearing aid of the present invention;

Figure 7 is a rear elevational view of the electromagnetic shielding case of the microphone for the hearing aid of the present invention;

The reference numerals in the figure and the components indicated therein are: 1-shell, 2-bottom box, 3-core coil combination, 4-signal slot, 5-diaphragm, 6-speak slot, 7 - Core coil signal line.

detailed description

The technical solutions of the present invention are further described below in conjunction with the accompanying drawings and a preferred embodiment.

Referring to Figures 4-7, the present embodiment relates to a microphone electromagnetic shielding case applied to a hearing aid, comprising a housing 1 and a bottom box 2 which are combined in a nested manner, and a signal line slot 4 and a housing provided on the housing 1 a sound groove 6 and a core coil assembly 3, a diaphragm 5 and a core coil combination signal line 7 encapsulated in a bottom case cavity; the core coil assembly 3 is fixedly coupled to the bottom case 2, the diaphragm 5 Fixedly attached to the open end edge of the bottom box 2, the core coil assembly signal line 7 is passed through the bottom box 2 cavity through the signal line slot of the housing 1 for connection to an external circuit for function.

Preferably, the core coil assembly 3 is fixedly coupled to the bottom of the bottom case 1.

The diaphragm 5 is preferably fixedly attached to the open end edge of the bottom case 2.

The shielding cavity is formed by nesting a casing 1 and a bottom casing 2, and a sliding fit is preferably provided between the casing 1 and the bottom casing 2.

The core coil combination signal line 7 is passed through the signal line slot of the outer casing 1 through the cavity of the bottom case 2. The outer casing 1 and the bottom case 1 and the signal line groove 4 and the sound port groove 6 are preferably formed by a one-time drawing process.

When the microphone unit using the electromagnetic shielding case is operated, the electric signal is passed through the core coil combination 3 by the signal line 7 exposed outside the signal line slot 4, and the core coil combination 3 is exchanged according to the electromagnetic induction effect. The magnetic field generated by the variable current will magnetize the core coil assembly 3, and according to the principle of homosexual repulsive and opposite phase attraction, and the magnetizing diaphragm 5 fixed on the open end edge of the bottom box 2, the pushing and pulling force is generated to drive the diaphragm 5 to vibrate. The air is agitated by the vibration of the diaphragm 5 and is transmitted from the sound exit groove 6 of the outer casing 1 to emit sound.

The invention improves the mechanical structure of the electromagnetic shielding shell, thereby greatly improving the electromagnetic shielding performance of the product under the condition of ensuring the sound quality of the product, in particular, adopting a nested design, so that the use The electromagnetic shielding performance of the microphone of the electromagnetic shielding shell is greatly enhanced in all directions. At the same time, the invention also optimizes the mechanical dimensions of the outer casing and the bottom box, and adopts a sliding cooperation combination, which greatly improves the manufacturability of the related microphone product. The invention also reduces the difficulty of the process; in addition, the invention also improves the design of the sound outlet and the signal line outlet of the conventional shielding shell, which is convenient to be fabricated by the stretching and punching one-time forming process, so that the manufacturing process of the magnetic shielding shell is more convenient. The cost is lower.

The above is a detailed description of the objects, technical solutions, and advantages of the present invention. It is to be understood that the foregoing is only the preferred embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

1. An improved structure of a moving iron microphone unit for use in a bone conduction hearing aid and a speaker device, comprising an armature, a diaphragm, a vibration conducting device, a magnetic core, a magnet piece, and a magnet piece disposed in the electromagnetic shielding case, The electromagnetic induction coil is composed of several parts. The utility model is characterized in that: the armature, the magnetic core, the magnet piece and the electromagnetic induction coil are fixedly connected by means of electric resistance, laser or ultrasonic welding and adhesive bonding, and constitute a driving magnet mechanism, and the guide in the driving magnet mechanism The magnetic core is fixedly connected to the diaphragm.

2. The moving iron microphone unit for use in a bone conduction hearing aid and a speaker device according to claim 1, wherein the armature of the driving magnet mechanism and the vibration transmitting device One end is fixedly connected.

The moving iron microphone unit for use in a bone conduction type hearing aid and a speaker apparatus according to claim 1 or 2, wherein the other end of the vibration transmission device and the electromagnetic shielding case Fixed connection.

The movable iron microphone unit for use in a bone conduction type hearing aid and a speaker apparatus according to claim 1 or 3, wherein a periphery of the diaphragm is hermetically fixed to the electromagnetic shield On the inner wall of the shell.

The moving iron microphone unit for use in a bone conduction hearing aid and a speaker device according to claim 1 or 2, wherein the driving magnet mechanism is further different according to the moving iron microphone product. The size and frequency response requirements are selected to be placed on either side of the cavity on either side of the diaphragm.

The moving iron microphone unit for use in a bone conduction type hearing aid and a speaker apparatus according to claim 1 or 3 or 4, wherein the electric iron microphone unit uses the electricity The shape of the magnetic shield can be designed according to different usage requirements (but not limited to): rectangular, square or round.

The moving iron microphone unit for use in a bone conduction hearing aid and a speaker device according to claim 1 or 2 or 3 or 4 or 5, wherein the moving iron microphone unit is The connection between the diaphragm and the drive magnet mechanism is adhesive bonding.

The moving iron microphone unit for use in a bone conduction hearing aid and a speaker device according to claim 1 or 2 or 3 or 4 or 6, wherein the moving iron microphone unit is The connection between the vibration conducting device and the electromagnetic shielding shell is a gas-tight connection of electric resistance, laser or ultrasonic welding and adhesive.

9. The moving iron microphone unit for use in a bone conduction type hearing aid and a speaker apparatus according to claim 8, wherein the moving iron microphone unit is provided with an opening in the electromagnetic shielding shell For connection to the vibration transmitting device.

10. The moving iron microphone unit for use in a bone conduction hearing aid and a speaker device according to claim 9, wherein the electromagnetic shielding shell of the moving iron microphone unit is provided thereon The opening is made by one punching and punching forming process.