JPS5657951A - Ionization smoke detector - Google Patents

Ionization smoke detector

Info

Publication number
JPS5657951A
JPS5657951A JP13323179A JP13323179A JPS5657951A JP S5657951 A JPS5657951 A JP S5657951A JP 13323179 A JP13323179 A JP 13323179A JP 13323179 A JP13323179 A JP 13323179A JP S5657951 A JPS5657951 A JP S5657951A
Authority
JP
Japan
Prior art keywords
smoke
circuit
high sensitivity
sensitivity level
level detecting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP13323179A
Other languages
Japanese (ja)
Other versions
JPS598874B2 (en
Inventor
Takao Fujisawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nittan Co Ltd
Original Assignee
Nittan Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nittan Co Ltd filed Critical Nittan Co Ltd
Priority to JP13323179A priority Critical patent/JPS598874B2/en
Publication of JPS5657951A publication Critical patent/JPS5657951A/en
Publication of JPS598874B2 publication Critical patent/JPS598874B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

PURPOSE: To prevent malfunction owing to the smoke of cigarrettes etc. by providing a timer circuit which operates a switching circuit when inputted for more than a fixed time even if the detecting level of the smoke is low in an ionization smoke detector.
CONSTITUTION: In the case of the smoke of a cigarrette or the like, it may reach the density at which a high sensitivity level detecting circuit 4 operates, but hardly persists for a long time continuously. A timer circuit 5 resets immediately when there is no more output of the high sensitivity level detecting circuit 4, that is, when a transistor Q3 is interrupted, because the charging charge of a capacitor C discharges by way of a diode D and a resistance R7. Because of this, even if the high sensitivity level detecting circuit 4 emits outputs plural times for a time shorter than the fixed time in the timer circuit 5, the detector will not operate.
COPYRIGHT: (C)1981,JPO&Japio
JP13323179A 1979-10-16 1979-10-16 Ionic smoke detector Expired JPS598874B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13323179A JPS598874B2 (en) 1979-10-16 1979-10-16 Ionic smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13323179A JPS598874B2 (en) 1979-10-16 1979-10-16 Ionic smoke detector

Publications (2)

Publication Number Publication Date
JPS5657951A true JPS5657951A (en) 1981-05-20
JPS598874B2 JPS598874B2 (en) 1984-02-28

Family

ID=15099782

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13323179A Expired JPS598874B2 (en) 1979-10-16 1979-10-16 Ionic smoke detector

Country Status (1)

Country Link
JP (1) JPS598874B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5949695A (en) * 1982-09-14 1984-03-22 三菱電機株式会社 Emergency communicator
JPS5998297A (en) * 1982-11-26 1984-06-06 日本電気株式会社 Warning signal conversion circuit
JPS59144993A (en) * 1983-02-08 1984-08-20 三菱電機株式会社 Emergency alarm
JPS61201193U (en) * 1985-06-05 1986-12-17
JPS6381595A (en) * 1986-09-25 1988-04-12 松下電工株式会社 Ionization type sensor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5949695A (en) * 1982-09-14 1984-03-22 三菱電機株式会社 Emergency communicator
JPH0221636B2 (en) * 1982-09-14 1990-05-15 Mitsubishi Electric Corp
JPS5998297A (en) * 1982-11-26 1984-06-06 日本電気株式会社 Warning signal conversion circuit
JPS59144993A (en) * 1983-02-08 1984-08-20 三菱電機株式会社 Emergency alarm
JPS61201193U (en) * 1985-06-05 1986-12-17
JPH0353351Y2 (en) * 1985-06-05 1991-11-21
JPS6381595A (en) * 1986-09-25 1988-04-12 松下電工株式会社 Ionization type sensor

Also Published As

Publication number Publication date
JPS598874B2 (en) 1984-02-28

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