JPH0438157U

JPH0438157U -

Info

Publication number: JPH0438157U
Application number: JP8101190U
Authority: JP
Priority date: 1990-07-30
Filing date: 1990-07-30
Publication date: 1992-03-31

Description

[Brief explanation of the drawing]

第１図乃至第６図は本考案の実施例を示すもの
で、第１図はドアホン子器全体の縦断側面図、第
２図は正面図、第３図は中央縦断面図、第４図は
第３図の左側面図、第５図及び第６図は取付状態
説明図、第７図はドアホン子器の従来例を示す縦
断側面図、第８図は同回路図、第９図，は従
来のハウリング防止策の一例を示す断面図では
分解斜視図は組立図である。１……ケーシング、２……ボデイ、３……カバ
ー、４……スピーカ、５……マイクロホン、６…
…スイツチ、７……回路ブロツク、１０……マイ
クロホン収納凹部、１４……マイクロホンキヤツ
プ、１７，１８……環状突条。 Figures 1 to 6 show an embodiment of the present invention, in which Figure 1 is a vertical side view of the entire doorphone slave device, Figure 2 is a front view, Figure 3 is a central vertical cross-sectional view, and Figure 4 is a left side view of Fig. 3, Figs. 5 and 6 are explanatory diagrams of the installation state, Fig. 7 is a vertical side view showing a conventional example of a door intercom sub unit, Fig. 8 is a circuit diagram of the same, Fig. 9, 1 is a sectional view showing an example of a conventional howling prevention measure, and the exploded perspective view is an assembled view. 1...Casing, 2...Body, 3...Cover, 4...Speaker, 5...Microphone, 6...
...Switch, 7...Circuit block, 10...Microphone housing recess, 14...Microphone cap, 17, 18...Annular protrusion.

Claims

[Scope of utility model registration request]

In a door phone slave device in which devices such as speakers, microphones, switches, circuit blocks, etc. are housed in a casing consisting of a body and a front cover, the outer peripheral surface of a microphone cap that is fitted into a microphone storage recess formed on the inner surface of the front cover. A microphone cap for a door phone slave device, characterized in that a plurality of annular protrusions are provided on the microphone cap.