JPS56124017A - Light detector - Google Patents

Light detector

Info

Publication number
JPS56124017A
JPS56124017A JP2854880A JP2854880A JPS56124017A JP S56124017 A JPS56124017 A JP S56124017A JP 2854880 A JP2854880 A JP 2854880A JP 2854880 A JP2854880 A JP 2854880A JP S56124017 A JPS56124017 A JP S56124017A
Authority
JP
Japan
Prior art keywords
light
receiving diode
output
rotary disc
detection
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.)
Granted
Application number
JP2854880A
Other languages
Japanese (ja)
Other versions
JPS6140324B2 (en
Inventor
Genichi Yoshimura
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.)
Brother Industries Ltd
Original Assignee
Brother Industries 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 Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to JP2854880A priority Critical patent/JPS56124017A/en
Publication of JPS56124017A publication Critical patent/JPS56124017A/en
Publication of JPS6140324B2 publication Critical patent/JPS6140324B2/ja
Granted 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
    • G01D5/32—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 with attenuation or whole or partial obturation of beams of light
    • G01D5/34—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/36—Forming the light into pulses

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)

Abstract

PURPOSE:To stabilize an output from a light detection part and improve reliability against a reduction of light energy in a light source by constituting two pieces of light-receiving diode for different light detection areas in an opposite position to a rotary disc. CONSTITUTION:Two pieces of light-receiving diode 3a, 3b for different light detection areas are arranged opposed to a luminous diode 2 against a rotary disc 4 where light penetration slits 6 are radially formed. When the rotary disc 4 turns, the first detection signal S1 having a level change is output from the light-receiving diode Ba and the second detection signal S2 of a fixed level is output from the light-receiving diode 3b. These detection signals are digitally converted by means of an A/D converter 8, 9 respectively, being input to a stabilization circuit 10 and a comparison arithmetic circuit 11.
JP2854880A 1980-03-05 1980-03-05 Light detector Granted JPS56124017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2854880A JPS56124017A (en) 1980-03-05 1980-03-05 Light detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2854880A JPS56124017A (en) 1980-03-05 1980-03-05 Light detector

Publications (2)

Publication Number Publication Date
JPS56124017A true JPS56124017A (en) 1981-09-29
JPS6140324B2 JPS6140324B2 (en) 1986-09-09

Family

ID=12251702

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2854880A Granted JPS56124017A (en) 1980-03-05 1980-03-05 Light detector

Country Status (1)

Country Link
JP (1) JPS56124017A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6027315U (en) * 1983-08-02 1985-02-23 東北リコ−株式会社 Light intensity fluctuation correction device for photoelectric encoder
JPS60188851A (en) * 1984-03-09 1985-09-26 Fanuc Ltd Speed detecting device of rotating body

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6027315U (en) * 1983-08-02 1985-02-23 東北リコ−株式会社 Light intensity fluctuation correction device for photoelectric encoder
JPS60188851A (en) * 1984-03-09 1985-09-26 Fanuc Ltd Speed detecting device of rotating body

Also Published As

Publication number Publication date
JPS6140324B2 (en) 1986-09-09

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