JPS5557134A - Transmission light type smoke detector - Google Patents

Transmission light type smoke detector

Info

Publication number
JPS5557134A
JPS5557134A JP13065278A JP13065278A JPS5557134A JP S5557134 A JPS5557134 A JP S5557134A JP 13065278 A JP13065278 A JP 13065278A JP 13065278 A JP13065278 A JP 13065278A JP S5557134 A JPS5557134 A JP S5557134A
Authority
JP
Japan
Prior art keywords
case
variation
luminous element
change
malfunction
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
JP13065278A
Other languages
Japanese (ja)
Inventor
Katsura Yamamoto
Akira Yokota
Takashi Suzuki
Mitsuo Hasegawa
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 JP13065278A priority Critical patent/JPS5557134A/en
Publication of JPS5557134A publication Critical patent/JPS5557134A/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
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (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)

Abstract

PURPOSE:To prevent the malfunction and thus increase the reliability by detecting the scale of the current supplied impulsively to the operating luminous element and then compensating the action point of the detector. CONSTITUTION:In case the transmitted light has no decrement under the normal state, a control is given by variable resistance 6 and the like so that pulse A may be larger slightly than pulse B. Thus the output of the output signal to output terminal 30 of comparator circuit 3 can be prevented. In case the current supplied to luminous element 4 has some change due to the variation of the voltage of power source 8, the change of the temperature and other factors, the emission amount of element 4 varies. Accordingly, the light quantity irradiated to photo detector 1 has also change. In this connection, pulses A and B applied to input terminals 31 and 32 of circuit 3 have virtually the same variation in case no reduction of the transmission light is caused by the smoke. As a result, the fluctuation of the emission amount of the luminous element due to the variation of the power voltage, the temperature and others can be compensated by the detection signal of the photo detector, thus preventing the malfunction and then increasing the reliability.
JP13065278A 1978-10-24 1978-10-24 Transmission light type smoke detector Pending JPS5557134A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13065278A JPS5557134A (en) 1978-10-24 1978-10-24 Transmission light type smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13065278A JPS5557134A (en) 1978-10-24 1978-10-24 Transmission light type smoke detector

Publications (1)

Publication Number Publication Date
JPS5557134A true JPS5557134A (en) 1980-04-26

Family

ID=15039363

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13065278A Pending JPS5557134A (en) 1978-10-24 1978-10-24 Transmission light type smoke detector

Country Status (1)

Country Link
JP (1) JPS5557134A (en)

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