JPS6039098U

JPS6039098U - Electromagnetic acoustic transducer

Info

Publication number: JPS6039098U
Application number: JP13004083U
Authority: JP
Inventors: 古瀬　節男; 高橋　善二郎
Original assignee: ティーディーケイ株式会社
Priority date: 1983-08-23
Filing date: 1983-08-23
Publication date: 1985-03-18

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の電磁型音響変換器の正面部分断面図、第
２図は同じく別の従来例における正面部分断面図、第３
図は更に別の従来例における正面部分断面図、第４図は
駆動回路の電気回路接続□図、第５図は本考案に係る電
磁型音響変換器の正面部分断面図、第６図及び第７図は
同じく別々の実施例における要部の各斜視図、第８図は
駆動回路の別の例における電気回路接続図、第９図は駆
動回路９更に別の例における電気回路接続図、第１０図
はケースの別の実施例における正面断面図、第１１図は
同じく更に別の実施例における半断面斜視図である。１・・・・・・外装ケース、２・・・・・・励磁コイル
、３・・・・・・鉄心、４・・・・・・ヨーク、５・・
・・・・永久磁石、６・・・・・・振動板、７・・・・
・・プリント回路基板、８・・・・・・回路部品、８７
・・・・・・抵抗、１０２・・・・・・空洞部。Figure 1 is a front partial sectional view of a conventional electromagnetic acoustic transducer, Figure 2 is a front partial sectional view of another conventional example, and Figure 3 is a front partial sectional view of another conventional example.
The figure is a front partial sectional view of yet another conventional example, FIG. 4 is an electric circuit connection diagram of a drive circuit, FIG. 5 is a front partial sectional view of an electromagnetic acoustic transducer according to the present invention, and FIGS. 7 is a respective perspective view of the main parts in the same separate embodiment, FIG. 8 is an electric circuit connection diagram in another example of the drive circuit, FIG. 9 is an electric circuit connection diagram in yet another example of the drive circuit 9, and FIG. FIG. 10 is a front sectional view of another embodiment of the case, and FIG. 11 is a half-sectional perspective view of still another embodiment. 1...Exterior case, 2...Excitation coil, 3...Iron core, 4...Yoke, 5...
...Permanent magnet, 6...Vibration plate, 7...
...Printed circuit board, 8...Circuit parts, 87
...Resistance, 102...Cavity part.

Claims

[Scope of utility model registration request]

an electromagnet; a permanent magnet disposed to surround the electromagnet; a diaphragm that faces magnetic poles of the electromagnet across an air gap and is excited by magnetic interaction between the electromagnet and the permanent magnet; and the electromagnet. , an electromagnetic acoustic transducer comprising a case containing a permanent magnet and the diaphragm, and a drive circuit that supplies a periodic current to the excitation coil of the electromagnet; An electromagnetic acoustic transducer characterized in that a series resistor is arranged in a cavity formed in the front surface of the diaphragm inside the case.