GB2253117A

GB2253117A - Capacitor microphone cartridge

Info

Publication number: GB2253117A
Application number: GB9126840A
Authority: GB
Inventors: Ja Bong Ku
Original assignee: BO SUNG ELECTRONICS CO Ltd
Current assignee: BO SUNG ELECTRONICS CO Ltd
Priority date: 1990-12-22
Filing date: 1991-12-18
Publication date: 1992-08-26
Anticipated expiration: 2011-12-18
Also published as: JPH04227200A; KR920014339A; KR930003063B1; CN1062632A; GB9126840D0; GB2253117B; CN1022882C

Abstract

The cartridge has a dielectric material plate 20 coated with electrostatic material which is separate from a diaphragm 5. The plate 20 is arranged on top of a fixed electrode 16 with the diaphragm 5 beneath the fixed electrode. Several apertures 21 are peripherally provided in the fixed electrode 16 for controlling the directional and frequency characteristics. The diaphragm 5 is made thinner in comparison with conventional ones whereby the frequency characteristic is improved. The dielectric material plate 20 is made thicker than conventional whereby static electricity reserving capacity is enhanced. Such an arrangement reduces the number of parts in the cartridge and simplifies manufacture. <IMAGE>

Description

SPECIFICATION TITLE OF THE INVENTION CAPACITOR MICROPHONE CARTRIDGE BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor mierophone cartridge.

More particularly, the present invention relates to a capaitor mierophone cartridge having special feathers capable of controlling Hregtional and frequency characteristics.

2. Description Relative to the Prior Art.

A capacitor microphone cartridge is mounted to a telephone, @ape recorder, toy or microphone usd for converting an audio signal inte an electric signal. For example, as shown in Fig. 2 a capactor mierophone cartridgeis described in Japanese Patent Laid-open Application No. 63-27 5300. That is when reviewing this, it is structured in such a manner that the capacitor microphone cartridge comprise a case 1 having a through hole 2 at center of bottom thereof and attatched with a cover 3 at its Exterior, An electrode ring 4 and a diaphragm 5 are fixed by adhering within the case 3 and a fixed electrode 6 and an insulator 7 are laid on the diaphragm 5. On the fixed electrode 6 there is a metal terminal plate 8.An amplifying element 9 is connected to the metal terminal plate 8 via an input lead 10 and an output lead 11 of the amplifying element 9 is connected to a printed circuit board 12 by a soldering 13.

However, since such conventional capaciter mierophone eartridge is tructured for its components such that the fixed electrode 6 and the metal electrode Pj ar:D sucessively connected on the top of the diaphragm 5 spread with a dielectric material and also the insulator 7 of eylindrical shape is required for insulation of the fixed electrode 6 and thereby a number of parts being of expensive in general are assembled, there has been problem that dimension of product becomes larger and assembling process becomes compliented as well as capacity becoming deterieratei.

SUMMARY OF THE INVENTION It is therefore an object of the present invention ro solve the pro- blem of such conventional capactor microphone cartridge.

In order to achieve the above and other objects and advantages of this Invention1 a capactor microphone cartridge in which an electrode.

ring and a diaphragm are provided within a case defined with a through hole at center of bottom side and mounted with a cover at its exterior and also an amplifying element is fixed to a printed circuit board by soldering, the capacitor microphone cartridge comprising: a cylindrical fixed electrode having a plurality of apertures defined at peripheral edge the fixed electrode so as to control directional and frequency characteristics and a protrusion portion protruded from the bottom of the fixed electrode, the fixed electrode is arranged on the diaphragm and connected to an input lead of said amplifying element at its top; an insulation ring for insulation the fixed electrode from the case; and a dielectric material pl.ate mounted on the protrusion portion of the fixed electrode and having a thickness so as to improve a statie electricity reserving capacity, the diaphragm having a thin thicknes is separately provided from the dielectric material plate so as to enhance a frequency characteristic.

In accordance with the present invention, all of the parts can be autematically assembled by a through process without employing a number of parts being of expensinve as convention whereby manufactueing cost is rednend and thereby more improved product in capacity can be munufactured by making it thinner type.

The forgoing and other objects as well as advantages of the present invention will become clear by followng description of the ivention with reference to the accompanying drawinge.

BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of the invention, and to show how the same may be carried out into effect, reference will now be made, by way of example witb respect to the accompanying drawings, in which: FIG. 1 is a cross sectional view of a capactor microphone cartridge according to the present invention, and FIG. 2 is a cross sectional view of conventional capacitor microphone cartridge.

Throughout the drawings, like reference numerals and symbols are used for desingnating like or equivalent parts or portions, for simplicity of illustration and explanation.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross sectional view of a capaciter mierophone cartridge of the present invention, and it is constructed in such a manner that, in a capacitor mierophone cartridge in which an electrode ring 4 and a disphragm 5 are provided within a case 1 defined with through hole 2 at center of bottom thereof and mounted with a cover 3 at its exterior and also an ampligying element 9 is fixed to a printed circuit board 12 by a older lag 1.3, a fixed electrode 16 connected wi.th an input lead 10 of the amplifying element 9 insulated by an insulation ring 17 is laid on at the top of the diaphragm 5 and also a dielectric plate 20 spread with an electrostatic meterial is provided on its top side again and then several apertures 21 are defined at peripheral edge of the fixed electrode IF.

According to a capacitor microphone cartridge of the present invention constructed as above, since the dielectric material plate 20 separate- ly adhered on top of the fixed electrode 16 at a state that the fixed electrode 16 insulated from the case 3 by the insulation ring 17 is directly connected with the diaphragm 5. The diaphragm 5 can be made thinner in comparing with conventional one and thereby there is advantage that frequency characteristic can be improved, and simultaneously since the dielectric material plate 20 is separately provided from the diaphragm 5, thickness of the dielectric material plate 20 can be made thicker whereby static electricity reserving capacity is made to be bigger, therefore there is effect that capacity of the capacitor microphone cartridge can be remarkably improved.

Moredver, according to the capacitor mierophone cartridge of the present invention, since a plurality of through holes 21 are defined at peripheral edge of the fixed electrode 16, there is special feature sapable of controlling directional characteristie and fowquency characterissie.

Thus, the capacitor microphone cartridge of the present invention is a novel invention having an effect that its interier structure is improved and thereby the number of parts are deereased and manufacturing process is raduced, so that not only manufacturing cost can be decreased but also excellent product in capacity can be manufactured into more thinner -pc.

It wili be appreciated that the present invention is not restricted to the particular embodiment that has been described hereinbefore and that variations anti modifications may be matle therein without departing from the spirit and scope of the invention as defined in the appended claims and equivalents thereof.

Claims

1. A capactor microphone cartridge in which an electrode ring and a diaphragm are provided within a case defined with a through hole at center of bottom side and mounted with a cover at its exterior and also an amplifying element is fixed to a printed circuit board by soldering, the capacitor microphone cartridge comprising: a cylindrical fixed electrode having a plurality of apertures defined at peripheral edge said fixed electrode so as to control directional and frequency characteristics and a protrusion portion protruded from the bottom of said fixed electrode, said fixed electrode is arranged on said diaphragm and connected to an input lead of said amplifying element at its top; an insulation ring for insulating said fixed electrode from said case; and a dielectric material plate mounted on said protrusion portion of said fixed electrode and having a thickness so as to improve a static electricity reserving capacity, said diaphragm having a thin thickness is separately provided from said dielectric material plate so as to enhance a frequency characteristic.

2. A capacitor microphone cartridge substantially as herein described with reference to, and as illustrated in, Figure 1 of the accompanying drawing.

3. A capacitor microphone cartridge comprising a metallic casing having an end wall with a sound hole therein, an electrode ring and a diaphragm mounted within the casing and a printed circuit board carried by the casing and having an amplifying element fixed thereto, wherein the microphone cartridge further comprises a fixed electrode having a cylindrical portion provided with a plurality of apertures for controlling directional and frequency characteristics and an end wall portion having a central region, said fixed electrode being arranged on said diaphragm and being connected to an input of said amplifying element, an electrically insulating ring insulating the fixed electrode from the casing, and a dielectric material plate mounted on the central region and having a relatively large thickness for improving static electricity reserving capacity, the diaphragm having a relatively thin thickness and being separate from the dielectric material plate so as to enhance a frequency characteristic.