JPS5451880A - Smoke detector - Google Patents

Smoke detector

Info

Publication number
JPS5451880A
JPS5451880A JP11828077A JP11828077A JPS5451880A JP S5451880 A JPS5451880 A JP S5451880A JP 11828077 A JP11828077 A JP 11828077A JP 11828077 A JP11828077 A JP 11828077A JP S5451880 A JPS5451880 A JP S5451880A
Authority
JP
Japan
Prior art keywords
thru
smoke
circuit
fire
detection parts
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
JP11828077A
Other languages
Japanese (ja)
Other versions
JPS5950929B2 (en
Inventor
Satoru Suzaki
Yoshihiko Okuda
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP11828077A priority Critical patent/JPS5950929B2/en
Publication of JPS5451880A publication Critical patent/JPS5451880A/en
Publication of JPS5950929B2 publication Critical patent/JPS5950929B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

PURPOSE:To achieve the earlier and surer discovery of fire by increasing sensitivity in response to the increase in the velocity of gas current in supervising space. CONSTITUTION:The photoelectric elements 7a thru 7c disposed to the smoke detecting chambers 3a thru 3c formed in a dark box 1 are connected to discrimination circuits 9a thru 9c via amplifiers 8a thur 8c to constitute smoke detection parts 5a thru 5c. A switching circuit 12 via AND circuit 11 and a sensitivity control circuit 14 via OR circuit 13 are connected to the discrimination circuits 9a thru 9c. Then, when fire breaks out in the supervising space and smoke evolves and subsequently enters the smoke detecing chambers 3a thru 3c, then the smoke deteciton parts 5a thru 5c, OR circuit 13 and sensitivity control circuit 14 actuate to gradually decrease the sensitivities of the respective smoke detection parts 5a thru 5c with lapse of time and when all the smoke detection parts 5a thru 5c actuate, the switching circuit 12 actuates to alarm the outbreak of the fire.
JP11828077A 1977-09-30 1977-09-30 Smoke detectors Expired JPS5950929B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11828077A JPS5950929B2 (en) 1977-09-30 1977-09-30 Smoke detectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11828077A JPS5950929B2 (en) 1977-09-30 1977-09-30 Smoke detectors

Publications (2)

Publication Number Publication Date
JPS5451880A true JPS5451880A (en) 1979-04-24
JPS5950929B2 JPS5950929B2 (en) 1984-12-11

Family

ID=14732743

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11828077A Expired JPS5950929B2 (en) 1977-09-30 1977-09-30 Smoke detectors

Country Status (1)

Country Link
JP (1) JPS5950929B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021139616A (en) * 2020-03-09 2021-09-16 ソーター テクノロジーズ，エルエルシー Sensor system, detection system and method for identifying smoking of electronic cigarette or cigarette

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021139616A (en) * 2020-03-09 2021-09-16 ソーター テクノロジーズ，エルエルシー Sensor system, detection system and method for identifying smoking of electronic cigarette or cigarette

Also Published As

Publication number Publication date
JPS5950929B2 (en) 1984-12-11

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