JPS5622934A - Light scattering system smoke detector - Google Patents

Light scattering system smoke detector

Info

Publication number
JPS5622934A
JPS5622934A JP9915879A JP9915879A JPS5622934A JP S5622934 A JPS5622934 A JP S5622934A JP 9915879 A JP9915879 A JP 9915879A JP 9915879 A JP9915879 A JP 9915879A JP S5622934 A JPS5622934 A JP S5622934A
Authority
JP
Japan
Prior art keywords
light
elliptic
focal axis
focus
emitted
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
JP9915879A
Other languages
Japanese (ja)
Other versions
JPS5940255B2 (en
Inventor
Tsunehiko Araki
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 JP9915879A priority Critical patent/JPS5940255B2/en
Publication of JPS5622934A publication Critical patent/JPS5622934A/en
Publication of JPS5940255B2 publication Critical patent/JPS5940255B2/en
Expired 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 improve photodetection efficiency by forming a curved surface mirror, which has one focal point at the center of curvature, on an elliptic reflective surface in a focusing block that has the elliptic reflective surface of a transparent body and photodetects light, emitted from one focus, at the other focus. CONSTITUTION:An elliptic pole is formed of a transparent body and the 1st reflector 13 is formed on its elliptic pole surface 13a to constitute focusing block 4. Once smoke enters smoke sensitive area 10, primary light emitted from light emitted by light emission element 5 scatters in any direction and light scattering at right angles to focal axis 14 is all photodetected. However, part of scattering light C1, after being reflected by elliptic pole surface 13a, strikes cylinder hole 15 in smoke sensitive area 10 in process of advancing to the other focal axis 19 and is refracted by its boundary surface, so that light C2 will never focus on the other focal axis 19. For the purpose, column surface 21 which has focal axis 14 agreeing with the center of curvature is formed in elliptic pole surface 13a where reflected light C2 strikes cylinder hole 15 (at opening angle theta), so that the above-mentioned reflected light C2' penetrates through focal axis 14 by focusing.
JP9915879A 1979-07-31 1979-07-31 light scattering smoke detector Expired JPS5940255B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9915879A JPS5940255B2 (en) 1979-07-31 1979-07-31 light scattering smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9915879A JPS5940255B2 (en) 1979-07-31 1979-07-31 light scattering smoke detector

Publications (2)

Publication Number Publication Date
JPS5622934A true JPS5622934A (en) 1981-03-04
JPS5940255B2 JPS5940255B2 (en) 1984-09-28

Family

ID=14239855

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9915879A Expired JPS5940255B2 (en) 1979-07-31 1979-07-31 light scattering smoke detector

Country Status (1)

Country Link
JP (1) JPS5940255B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111080960A (en) * 2020-01-20 2020-04-28 上海中环科仪消防报警设备有限公司 Smoke detection device with light guide scattering structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6688966B2 (en) 2015-07-27 2020-04-28 パナソニックＩｐマネジメント株式会社 Particle detection sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111080960A (en) * 2020-01-20 2020-04-28 上海中环科仪消防报警设备有限公司 Smoke detection device with light guide scattering structure

Also Published As

Publication number Publication date
JPS5940255B2 (en) 1984-09-28

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