JPH056999U - Condenser microphone unit - Google Patents

Abstract

(57) [Abstract] [Purpose] The component parts of the condenser microphone are securely fixed in the unit case, and at the same time, electrostatic shielding is performed. [Structure] A metal mesh 21 made of a conductive metal is provided on the inner peripheral surface of the unit case 13, and components such as the insulating seat 1, the back electrode plate 2, and the diaphragm 4 are fixed via the metal mesh 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a condenser microphone unit, and more particularly, to a condenser microphone unit in which unit components are securely fixed in a unit case and electrostatic shielding can be performed at the same time.

[0002]

[Prior Art]

 Capacitor microphones are designed to extract the change in capacitance between the diaphragm and the back electrode, which is a fixed electrode located behind it, as a change in voltage due to the vibration of the diaphragm. The need for a high-voltage power supply is eliminated, the microphone unit can be easily made smaller and lighter, and it is widely used from commercial to general-purpose models.

An example of such a condenser microphone unit will be described with reference to FIG. 2. In the opening of a hollow bottomed insulating seat 1 made of an insulating material and having one end open, the outer surface thereof is slightly away from the tip of the opening. A disk-shaped back electrode plate 2 is fitted so as to retreat. A diaphragm 4 having a peripheral edge supported by a ring 3 is fixed to the tip of the opening of the back electrode plate 2 with a gap from the back electrode plate 2. The impedance converter 5 is provided with a terminal 6 on a terminal plate 7 provided outside the insulating seat 1, and a hollow shaft core portion provided so as to extend from the center of the bottom of the insulating seat 1 to the outside. It is fixed to the other end of a lead wire 9 which is connected to the back electrode plate 2 through one end and is soldered or the like. The lead wire 9 is held by a sealing material 10 inserted into the shaft core portion 8. A plurality of through holes 11 are provided in the bottom of the insulator 1 and the back electrode plate 2, respectively.

The insulating seat 1, the ring 3, and the terminal plate 7 are formed to have substantially the same outer circumference, and a holding cylindrical body 12 having a similar outer diameter is prepared. One end of the holding cylindrical body 12 is attached to the insulating seat 1. At the bottom and the other end abut on the terminal plate 7 to hold the gap between the insulating seat 1 and the terminal plate 7, and then place it in the unit case 13 made of metal such as soft aluminum. It is fixed by swaging by curling. An opening 14 for picking up sound is formed on the front surface of the unit case 13, and a side surface opening 15 for taking in a directional component is formed on the side surface. The metal net 16 is for preventing noise that is electrostatically coupled from the side opening 15. An opening 16 is also formed in the holding cylindrical body 12 corresponding to these side surface openings 15. Finally, a metal net 17 is wound around the outer peripheral surface of the unit case 13 so as to cover the side opening 15.

[0005]

[Problems to be solved by the device]

 As described above, in the conventional condenser microphone unit, the components such as the insulator 1, the back electrode plate 2, the diaphragm 4 and the impedance converter 5 are fixed in the unit case 13 by plastic deformation by caulking the unit case 13. ing. Therefore, these components inside may be deformed by the temperature at the time of plastic deformation, the fixing force becomes small, rattling occurs in the components, and abnormal noise and electrical contact failure may occur. In order to solve this, it has been proposed to insert a washer-shaped rubber washer between the component and the unit case 13, but a lead wire (not shown) is pulled out from the terminal 18 of the terminal board 7. As a result, the rubber washer may be deformed by the heat of soldering, which is not a complete solution.

Therefore, an object of the present invention is to provide a condenser microphone unit in which components of the microphone unit are securely fixed in the unit case and at the same time electrostatic shielding can be performed.

[0007]

[Means for Solving the Problems]

 This invention is a condenser microphone unit in which components such as a vibration plate and a back electrode insulating seat are housed in a unit case, and a conductive metal wire mesh is provided on the inner peripheral surface of the unit case. The components are characterized by being fixed to the unit case.

[0008]

[Function] Since the wire netting is elastic and heat resistant, the wire netting can protect the components inside the unit case from temperature, vibration, shock, etc. In addition, noise that is electrostatically coupled from the side opening can enter. It can also have the function of an electrostatic shield that prevents Further, since the wire mesh can be fixed at the same time as the fixing of the component parts, the manufacture is simple and the wire mesh can be provided at a low cost.

[0009]

【Example】

 An embodiment of this invention will be described below with reference to FIG. In addition, the same reference numerals are given to the constituent elements that are substantially the same in the conventional example described above, and detailed description thereof will be omitted.

A wire mesh 21 is wound around an outer peripheral surface of a holding cylinder 12 that holds a gap between the insulating seat 1 and the terminal plate 7. The wire net 21 is made of a conductive metal such as iron or brass, and has a wire diameter of 0.1 mm and 100 mesh. The unit case 13 is caulked after the wire net 21 is wound around the outer peripheral surface of the holding cylinder 12. The caulking portion 22 is electrically connected to the terminal plate 7 via the conductive wire mesh 21.

Since the wire net 21 has elasticity and heat resistance, the components such as the insulator 1, the back electrode plate 2, and the diaphragm 4 in the unit case 13 are kept at the temperature when the unit case 13 is plastically deformed. In addition to being able to protect against vibration, shock, etc., component parts can also be protected against vibration during use, etc. In addition, it also functions as an electrostatic shield that prevents noise that is electrostatically coupled from the side opening 15 from entering. You can have it. Although the number of parts is not different from the conventional one, the wire mesh 21 can be fixed when the unit case 13 is crimped, so that a separate step of fixing the wire mesh unlike the conventional manufacturing process is not necessary, and it can be provided at a low cost. ..

[0012]

[Effect of the device]

 The condenser microphone unit of the present invention has a conductive metal wire mesh on the inner peripheral surface of the unit case, and the component parts are fixed to the unit case through this wire mesh. This can be done at the same time, eliminating the need for a separate process of winding a wire mesh as in the past, and reducing the manufacturing process, so that it can be provided at a low cost. In addition, by constructing the net with metal, the elasticity and heat resistance of the metal can protect the components inside the unit case from temperature, vibration, shock, etc. In addition, noise that is electrostatically coupled from the side opening will enter. It can also have the function of an electrostatic shield that prevents

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an example of a conventional condenser microphone unit.

[Explanation of symbols]

 1 Insulator 2 Back electrode plate 4 Vibration plate 5 Impedance converter 13 Unit case 15 Side opening 21 Wire mesh

Claims (1)

[Claims for utility model registration] [Claim 1] In a condenser microphone unit in which components such as a diaphragm and a back electrode insulator are housed in a unit case, the inner peripheral surface of the unit case is made of a conductive metal. A condenser microphone unit having a wire net, and the constituent parts being fixed to the unit case through the wire net.