JPS5847155U

JPS5847155U - Smoke detection device using modulated pulsed light

Info

Publication number: JPS5847155U
Application number: JP13919081U
Authority: JP
Inventors: 安川　誠; 健二石井
Original assignee: 能美防災株式会社
Priority date: 1981-09-19
Filing date: 1981-09-19
Publication date: 1983-03-30
Also published as: JPH0128451Y2

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図は従来知られているパルス光による煙検出装置
に変調パルス光を用いるようにした装置の回路図、第３
図はこの考案の一実施例の回路４図、第２図と第４図と
はそれぞれ第１図および第３図に示した装置の各部分の
動作を示すタイムチャｌトである。２・・・変調パルス光を発生する発光素子、４・・・素
子２の光を受ける光電素子、５・・・帯域フィルタ、６
・・・増幅器、７・・・半波整流回路、１１・・・光電
素子４の出力波形整形回路、１２・・・整流回路７の出
力の充放電回路、Ｃ１・・・光電素子４の出力によって
充電されるコン≠ンサ、Ｔ、・・・コンデンサＣ１の放
電回路に設けたスイッチング素子、Ｙ・・・火災信号発
生用継電器。- Figure 1 is a circuit diagram of a conventional smoke detection device using pulsed light that uses modulated pulsed light;
FIG. 4 is a circuit diagram of one embodiment of the invention, and FIGS. 2 and 4 are time charts showing the operation of each part of the apparatus shown in FIGS. 1 and 3, respectively. 2... Light emitting element that generates modulated pulsed light, 4... Photoelectric element that receives light from element 2, 5... Bandpass filter, 6
...Amplifier, 7.Half-wave rectifier circuit, 11.Output waveform shaping circuit of photoelectric element 4, 12.Charging and discharging circuit for output of rectifier circuit 7, C1.. Output of photoelectric element 4 Capacitor charged by ≠ capacitor, T... switching element provided in the discharge circuit of capacitor C1, Y... relay for generating a fire signal.

Claims

[Scope of utility model registration request]

A light emitting element that generates modulated pulsed light, a photoelectric element that receives the pulsed light across a space through which smoke passes, a capacitor that is charged by the output of the photoelectric element, and an output waveform shaping circuit of the photoelectric element, It includes a charging/discharging circuit for the output of the shaping circuit, and a circuit that conducts a switching element provided in the discharging circuit for the capacitor according to the differential value of the output of the charging/discharging circuit, so that the voltage of the capacitor reaches a predetermined reference value. A smoke detection device that uses modulated pulsed light to issue a fire signal when a certain percentage is reached.