JPS5631624A - Photoelectronic type smoke detector of scattered light detecting type - Google Patents

Photoelectronic type smoke detector of scattered light detecting type

Info

Publication number
JPS5631624A
JPS5631624A JP10777079A JP10777079A JPS5631624A JP S5631624 A JPS5631624 A JP S5631624A JP 10777079 A JP10777079 A JP 10777079A JP 10777079 A JP10777079 A JP 10777079A JP S5631624 A JPS5631624 A JP S5631624A
Authority
JP
Japan
Prior art keywords
type
shield plate
smoke detector
photoelectronic
scattered light
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.)
Pending
Application number
JP10777079A
Other languages
Japanese (ja)
Inventor
Hisatomi Taguchi
Koji Watanabe
Hirokazu Matsunaga
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.)
Noritake Co Ltd
Original Assignee
Noritake Co Ltd
Nippon Toki 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 Noritake Co Ltd, Nippon Toki Co Ltd filed Critical Noritake Co Ltd
Priority to JP10777079A priority Critical patent/JPS5631624A/en
Publication of JPS5631624A publication Critical patent/JPS5631624A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

PURPOSE:To obtain the same performance without using photodetecting lens, by providing the 1st shield plate shielding unnecessary light from the light source of the smoke detector and the 2nd shield plate shielding unnecessary light produced by it. CONSTITUTION:The 1st shield plate 5A is provided at the location where the unnecessary light from the light source 1 providing the projection lens 2 is not entered to the photodetector 4A. Further, the 2nd shield plate 6 is provided at the location where the unnecessary light produced at the ridge 5A' of the 1st shield plate 5A with reflection and diffraction is not entered to the photodetector 4A. The provision of the two shield plates like this enables to obtain the same S/N and sensitivity as the provision of expensive photo-detecting lens without it.
JP10777079A 1979-08-24 1979-08-24 Photoelectronic type smoke detector of scattered light detecting type Pending JPS5631624A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10777079A JPS5631624A (en) 1979-08-24 1979-08-24 Photoelectronic type smoke detector of scattered light detecting type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10777079A JPS5631624A (en) 1979-08-24 1979-08-24 Photoelectronic type smoke detector of scattered light detecting type

Publications (1)

Publication Number Publication Date
JPS5631624A true JPS5631624A (en) 1981-03-31

Family

ID=14467561

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10777079A Pending JPS5631624A (en) 1979-08-24 1979-08-24 Photoelectronic type smoke detector of scattered light detecting type

Country Status (1)

Country Link
JP (1) JPS5631624A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014142283A (en) * 2013-01-24 2014-08-07 Tokyo Parts Ind Co Ltd Water droplet detector and water droplet removal device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5011398B1 (en) * 1970-12-14 1975-04-30

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5011398B1 (en) * 1970-12-14 1975-04-30

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014142283A (en) * 2013-01-24 2014-08-07 Tokyo Parts Ind Co Ltd Water droplet detector and water droplet removal device

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