JPS6275669U

JPS6275669U -

Info

Publication number: JPS6275669U
Application number: JP16572485U
Authority: JP
Priority date: 1985-10-30
Filing date: 1985-10-30
Publication date: 1987-05-14

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を採用した電話シス
テムのブロツク図、第２図は第１図の要部ブロツ
ク図、第３図は従来のベル信号送出装置により得
られるベル信号の電圧電流特性曲線１と本考案の
実施例により得られるベル信号の電圧電流特性曲
線２，３とを示す図、第４図は従来のベル信号送
出装置を採用した電話システムのブロツク図であ
る。４……ベル信号源、７……電話機、２０……フ
ツクスイツチ、２２……ベル回路、２３……ベル
、２４……電話機回路、５０……電流リミツタ回
路、６０……スイツチ回路。 Fig. 1 is a block diagram of a telephone system adopting an embodiment of the present invention, Fig. 2 is a block diagram of the main part of Fig. 1, and Fig. 3 is a voltage and current of a bell signal obtained by a conventional bell signal sending device. FIG. 4 is a block diagram of a telephone system employing a conventional bell signal transmitting device. 4...Bell signal source, 7...Telephone, 20...Hook switch, 22...Bell circuit, 23...Bell, 24...Telephone circuit, 50...Current limiter circuit, 60...Switch circuit.

Claims

[Claims for Utility Model Registration] (1) A telephone whose impedance changes between on-hook and off-hook, and a bell which is connected to a predetermined number of said telephones based on incoming call detection and which generates a bell signal to be given to said telephones. A bell signal transmitting device comprising: a signal source; and a current limiter circuit connected in series with the bell signal source to control the current of the bell signal by the bell signal source based on a change in the impedance of the telephone set. (2) The impedance of a telephone is large when on-hook and small when off-hook, and the current limiter circuit has a current value i (Z large) that flows when the impedance is large and a current value that flows when the impedance is small. Utility model registration claim 1, characterized in that the current of the bell signal is controlled by setting the relationship with i (Z small) as follows: i (Z small) = i (Z large) Bell signal sending device.