JPS57191501A - Photoelectric detecting method - Google Patents

Photoelectric detecting method

Info

Publication number
JPS57191501A
JPS57191501A JP7562781A JP7562781A JPS57191501A JP S57191501 A JPS57191501 A JP S57191501A JP 7562781 A JP7562781 A JP 7562781A JP 7562781 A JP7562781 A JP 7562781A JP S57191501 A JPS57191501 A JP S57191501A
Authority
JP
Japan
Prior art keywords
external light
light
output
detects
detecting means
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
JP7562781A
Other languages
Japanese (ja)
Inventor
Hidehiko Yamamoto
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP7562781A priority Critical patent/JPS57191501A/en
Publication of JPS57191501A publication Critical patent/JPS57191501A/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
    • G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers

Abstract

PURPOSE:To eliminate the influence of external light by providing two detectors which detect a body photoelectrically, and comparing the output of a photodetector which detects reflected light from the body with the output of the other detector which detects only the external light. CONSTITUTION:Photoelectric detecting means 11 and 11' consist of light emitting elemnts 16 and 16' and photodetecting elements 13 and 13'. The photoelectric detecting means 11 is arranged near a body 5 to be detected to detect the presence of the body 5 by detecting variation in the quantity of reflected light from the body 5. The other detecting means 11' detects only the ambient light of the body 5. Both the means 11 and 11' are influenced equally by external light, so a comparator 12 compares an output VC, which corresponds to both external light and reflected light from the body with an output VD which corresponds to only the external light, thus eliminating the influence of the external light.
JP7562781A 1981-05-21 1981-05-21 Photoelectric detecting method Pending JPS57191501A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7562781A JPS57191501A (en) 1981-05-21 1981-05-21 Photoelectric detecting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7562781A JPS57191501A (en) 1981-05-21 1981-05-21 Photoelectric detecting method

Publications (1)

Publication Number Publication Date
JPS57191501A true JPS57191501A (en) 1982-11-25

Family

ID=13581653

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7562781A Pending JPS57191501A (en) 1981-05-21 1981-05-21 Photoelectric detecting method

Country Status (1)

Country Link
JP (1) JPS57191501A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59195116A (en) * 1983-04-20 1984-11-06 Matsushita Electric Works Ltd Photoelectric type position detecting circuit
EP0484877A2 (en) * 1990-11-05 1992-05-13 Kabushiki Kaisha Toshiba Photo-interrupter
FR2756990A1 (en) * 1996-12-05 1998-06-12 Schneider Electric Sa PROXIMITY DETECTOR WITH QUICK RECEPTION AMPLIFIER

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59195116A (en) * 1983-04-20 1984-11-06 Matsushita Electric Works Ltd Photoelectric type position detecting circuit
JPH0342406B2 (en) * 1983-04-20 1991-06-27
EP0484877A2 (en) * 1990-11-05 1992-05-13 Kabushiki Kaisha Toshiba Photo-interrupter
FR2756990A1 (en) * 1996-12-05 1998-06-12 Schneider Electric Sa PROXIMITY DETECTOR WITH QUICK RECEPTION AMPLIFIER
DE19753835B4 (en) * 1996-12-05 2004-04-08 Schneider Electric S.A. Proximity sensor with fast reception amplifier

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