JPS6455698A - Photoelectric smoke sensor - Google Patents

Photoelectric smoke sensor

Info

Publication number
JPS6455698A
JPS6455698A JP21245387A JP21245387A JPS6455698A JP S6455698 A JPS6455698 A JP S6455698A JP 21245387 A JP21245387 A JP 21245387A JP 21245387 A JP21245387 A JP 21245387A JP S6455698 A JPS6455698 A JP S6455698A
Authority
JP
Japan
Prior art keywords
circuit
amplifying circuit
charging
resistance
reception signal
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
JP21245387A
Other languages
Japanese (ja)
Inventor
Masanobu Ogawa
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 JP21245387A priority Critical patent/JPS6455698A/en
Publication of JPS6455698A publication Critical patent/JPS6455698A/en
Pending legal-status Critical Current

Links

Landscapes

  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

PURPOSE:To reduce the degree of amplification of a light reception signal amplifying circuit and to reduce power consumption by using a differential amplifying circuit as a comparing circuit provided in the succeeding stage of the light reception signal amplifying circuit. CONSTITUTION:A PIN photodiode PD is used as a photodetector in a light reception signal amplifying circuit I, and the signal photoelectrically converted by the PD is amplified with a prescribed gain by an amplifying circuit 1a and is inputted to a charging/discharging circuit 1b consisting of a capacitor C1 and a resistance R1, and the output of the charging/discharging circuit 1b is a gate voltage VG1 of a FET Q1 of a FET differential amplifying circuit constituting, the comparing circuit II. A switching circuit consisting of transistors Q3-Q5, a resistance 5, a charging/discharging circuit 3a consisting of a resistance 6 and a capacitor C2, and a comparator 3b are combined to constitute a storage circuit III, and a SCR as a switching element is turned off to give an alarm from a sensor when an input voltage Vin of the comparator 3b exceeds a reference value VREF. Thus, the current consumption of a light emitting element is reduced.
JP21245387A 1987-08-26 1987-08-26 Photoelectric smoke sensor Pending JPS6455698A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21245387A JPS6455698A (en) 1987-08-26 1987-08-26 Photoelectric smoke sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21245387A JPS6455698A (en) 1987-08-26 1987-08-26 Photoelectric smoke sensor

Publications (1)

Publication Number Publication Date
JPS6455698A true JPS6455698A (en) 1989-03-02

Family

ID=16622873

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21245387A Pending JPS6455698A (en) 1987-08-26 1987-08-26 Photoelectric smoke sensor

Country Status (1)

Country Link
JP (1) JPS6455698A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH044392U (en) * 1990-04-23 1992-01-16

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH044392U (en) * 1990-04-23 1992-01-16

Similar Documents

Publication Publication Date Title
JPS57173220A (en) Comparator circuit
JPS5711548A (en) Optical receiving circuit
JPS57204609A (en) Amplifier
JPS54104760A (en) Amplifier of low power consumption type
CN217428089U (en) Front discharge circuit of photoelectric detector
JPS56141617A (en) Comparator circuit
JPS5672507A (en) Current source circuit
JPS5580936A (en) Optical receiving circuit
JPS56162508A (en) Amplitude wave detecting circuit
JPH03179816A (en) Electronic switch
JPS5749906A (en) Distance measuring circuit
JPS6216021Y2 (en)
JPS5649927A (en) Photometry amplification circuit
JPS54154255A (en) Amplifier circuit
SU1146793A1 (en) Optronic device
JPS5690225A (en) Photosensor circuit
JPS645213A (en) Shock noise preventing circuit
JPS6489632A (en) Optical receiving circuit
JPS57125507A (en) Direct current amplifier
JPS56147533A (en) Light receiving and amplifying circuit
JPS56169262A (en) Photoelectric converting circuit
JPS61153354U (en)
JPS56143924A (en) Photodetector
JPS63144737U (en)
JPS63247144A (en) Light control system light receiving circuit