JPS57163888A - Adjusting method for photodetecting circuit - Google Patents

Adjusting method for photodetecting circuit

Info

Publication number
JPS57163888A
JPS57163888A JP56049619A JP4961981A JPS57163888A JP S57163888 A JPS57163888 A JP S57163888A JP 56049619 A JP56049619 A JP 56049619A JP 4961981 A JP4961981 A JP 4961981A JP S57163888 A JPS57163888 A JP S57163888A
Authority
JP
Japan
Prior art keywords
medium
light source
operational amplifier
output voltage
margin
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
JP56049619A
Other languages
Japanese (ja)
Inventor
Koichiro Abe
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56049619A priority Critical patent/JPS57163888A/en
Publication of JPS57163888A publication Critical patent/JPS57163888A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver

Abstract

PURPOSE:To obtain a margin at both sides where a medium is present and absent even if a light source deteriorates, by adjusting the degree of amplification of the operational amplifier of a presence detector in the state of the medium is inserted between the light source and a photodetecting element. CONSTITUTION:The output voltage of a phototransistor 13 which receives light transmitted through a detection medium 12 from a light source 11 is amplified by an operational amplifier 14 and then inputted to a comparator 15, where it is compared with a threshold level and discriminated. Its discrimination output V0 is supplied to a logical circuit. On the other hand, the voltage amplification degree of the operational amplifier 14 is set optionally to 1- a maximum performance value by selecting the value of a feedback resistance Rf, and while the medium is interposed between the light source and photodetecting element, an output voltage is given a prescribed value by adjustment. Consequently, a margin which has excellent balance between a medium side and a no-medium side in the state of reduction of a variation output voltage due to the decrease in the quantity of the light of the light source and the drift of each circuit is obtained.
JP56049619A 1981-04-02 1981-04-02 Adjusting method for photodetecting circuit Pending JPS57163888A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56049619A JPS57163888A (en) 1981-04-02 1981-04-02 Adjusting method for photodetecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56049619A JPS57163888A (en) 1981-04-02 1981-04-02 Adjusting method for photodetecting circuit

Publications (1)

Publication Number Publication Date
JPS57163888A true JPS57163888A (en) 1982-10-08

Family

ID=12836242

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56049619A Pending JPS57163888A (en) 1981-04-02 1981-04-02 Adjusting method for photodetecting circuit

Country Status (1)

Country Link
JP (1) JPS57163888A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5970990A (en) * 1982-10-18 1984-04-21 Ricoh Co Ltd Light regulation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5970990A (en) * 1982-10-18 1984-04-21 Ricoh Co Ltd Light regulation
JPH0377475B2 (en) * 1982-10-18 1991-12-10 Ricoh Kk

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