JPS56115576A - Photodetecting circuit - Google Patents

Photodetecting circuit

Info

Publication number
JPS56115576A
JPS56115576A JP1938380A JP1938380A JPS56115576A JP S56115576 A JPS56115576 A JP S56115576A JP 1938380 A JP1938380 A JP 1938380A JP 1938380 A JP1938380 A JP 1938380A JP S56115576 A JPS56115576 A JP S56115576A
Authority
JP
Japan
Prior art keywords
photodetector
voltage
output
resistor
amplifier
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
JP1938380A
Other languages
Japanese (ja)
Inventor
Osamu Isaka
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP1938380A priority Critical patent/JPS56115576A/en
Publication of JPS56115576A publication Critical patent/JPS56115576A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/264—Mechanical constructional elements therefor ; Mechanical adjustment thereof

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Light Receiving Elements (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To prevent the variation in the detecting characteristics of the photodetecting circuit having a light emitting element and a photodetector due to the change in the temperature by controlling the applied voltage so that the output from a photodetector separately provided is retained constantly. CONSTITUTION:The light emitted from the light emitting element 1 is applied to the first photodetector 2, and the light of amount responsive to the state of an article 7 is applied to the second photodetector 3. The output of the photodetector 3 is amplified by an amplifier 6, which in turn produces a detected output responsive to the state of the article 7. The voltage produced across a resistor R2 due to the output current of the photodetector 2 is applied to a differential amplifier 4 through a resistor R3 as a comparison voltage and compared with a voltage divided via resistors R4, R5 from the voltage of a reference power source 8. The output of the amplifier 4 is applied to the base of the transistor 5, and the transistor 5 is so controlled that the voltage produced at the resistor R2 becomes always constant.
JP1938380A 1980-02-19 1980-02-19 Photodetecting circuit Pending JPS56115576A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1938380A JPS56115576A (en) 1980-02-19 1980-02-19 Photodetecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1938380A JPS56115576A (en) 1980-02-19 1980-02-19 Photodetecting circuit

Publications (1)

Publication Number Publication Date
JPS56115576A true JPS56115576A (en) 1981-09-10

Family

ID=11997774

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1938380A Pending JPS56115576A (en) 1980-02-19 1980-02-19 Photodetecting circuit

Country Status (1)

Country Link
JP (1) JPS56115576A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60107843U (en) * 1983-12-17 1985-07-22 コニカ株式会社 position sensing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60107843U (en) * 1983-12-17 1985-07-22 コニカ株式会社 position sensing device

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