JPS57118108A - Distance detector - Google Patents

Distance detector

Info

Publication number
JPS57118108A
JPS57118108A JP435881A JP435881A JPS57118108A JP S57118108 A JPS57118108 A JP S57118108A JP 435881 A JP435881 A JP 435881A JP 435881 A JP435881 A JP 435881A JP S57118108 A JPS57118108 A JP S57118108A
Authority
JP
Japan
Prior art keywords
photodetector
radiations
detection
opposition
photodetecting
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
JP435881A
Other languages
Japanese (ja)
Inventor
Shuichi Tamura
Takao Kinoshita
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP435881A priority Critical patent/JPS57118108A/en
Publication of JPS57118108A publication Critical patent/JPS57118108A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C3/00—Measuring distances in line of sight; Optical rangefinders
    • G01C3/02—Details
    • G01C3/06—Use of electric means to obtain final indication
    • G01C3/08—Use of electric radiation detectors

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Optical Distance (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To decrease the influence of radiations from other than an object and to improve the accuracy of distance detection by disposing a photodetector receiving the radiations reflected from the object and an other photodetector having a photodetecting surface of such a shape as to encircle the photodetecting surface of said detector and constituting a circuit in such a way that the electric outputs thereof are in opposition to each other. CONSTITUTION:The circumference of a photodetector for detection of the signal light receiving the radiations reflected from an object is encircled with a photodetector for canceling noise of roughly the same characteristics and photodetecting area and a circuit is so connected that the electrical outputs of these photodetectors are in opposition to each other. For example, a photodetector 5 for detection of signal light and a photodetector 11 for cancelling noise separated by means of an insulating region 12 on the same chip are formed. Since 5 and 11 connected in mutually opposite directions, the electromotive forces negate to each other upon incidence of the radiations other than from the target, and the output of an operational amplifier 10 is virtually eliminated, thus the detection waveform for the radiation from a radiation source 3 is extremely sharp.
JP435881A 1981-01-14 1981-01-14 Distance detector Pending JPS57118108A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP435881A JPS57118108A (en) 1981-01-14 1981-01-14 Distance detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP435881A JPS57118108A (en) 1981-01-14 1981-01-14 Distance detector

Publications (1)

Publication Number Publication Date
JPS57118108A true JPS57118108A (en) 1982-07-22

Family

ID=11582159

Family Applications (1)

Application Number Title Priority Date Filing Date
JP435881A Pending JPS57118108A (en) 1981-01-14 1981-01-14 Distance detector

Country Status (1)

Country Link
JP (1) JPS57118108A (en)

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