JPS5657951A - Ionization smoke detector - Google Patents
Ionization smoke detectorInfo
- 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
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
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)
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 |
-
1979
- 1979-10-16 JP JP13323179A patent/JPS598874B2/en not_active Expired
Cited By (7)
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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