JPS56111418A - Position detection system - Google Patents

Position detection system

Info

Publication number
JPS56111418A
JPS56111418A JP1407180A JP1407180A JPS56111418A JP S56111418 A JPS56111418 A JP S56111418A JP 1407180 A JP1407180 A JP 1407180A JP 1407180 A JP1407180 A JP 1407180A JP S56111418 A JPS56111418 A JP S56111418A
Authority
JP
Japan
Prior art keywords
light
pattern
position detection
pulse
shade
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
JP1407180A
Other languages
Japanese (ja)
Inventor
Isao Murakami
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1407180A priority Critical patent/JPS56111418A/en
Publication of JPS56111418A publication Critical patent/JPS56111418A/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
    • G01D5/32—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)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Transform (AREA)

Abstract

PURPOSE:To perform position detection free from erroneous operation by improving an SN ratio while increasing a signal, by obtaining timing pulses by detecting leading and trailing edges of light pulses which correspond to a light and shade pattern alternating a light state and shade state at constant intervals. CONSTITUTION:Slits 2a and dark parts 2b are provided at angles 2theta along the periphery of rotaty disk 1 and the angle 2theta should be twice angle (theta) of a usual pattern. A singal obtained through light source part 6 and photodetection part 7 is converted into rectangular-wave pulse S2 through a waveform shaping circuit. This signal S2 is inputted to monostable pulse circuit 11 and monostable pulse circuit 12 having inverter 13 at its front part to output timing pulse S3, corresponding to the leading and trailing edges of rectangular-wave pulse S2, via OR gate 14. Since the pattern having a period twice that of a usual light-and-shade pattern is used, the SN ratio is improved by increasing the signal level, so that the position detection free from erroneous operation can be performed.
JP1407180A 1980-02-07 1980-02-07 Position detection system Pending JPS56111418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1407180A JPS56111418A (en) 1980-02-07 1980-02-07 Position detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1407180A JPS56111418A (en) 1980-02-07 1980-02-07 Position detection system

Publications (1)

Publication Number Publication Date
JPS56111418A true JPS56111418A (en) 1981-09-03

Family

ID=11850864

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1407180A Pending JPS56111418A (en) 1980-02-07 1980-02-07 Position detection system

Country Status (1)

Country Link
JP (1) JPS56111418A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01146670U (en) * 1988-03-28 1989-10-09

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01146670U (en) * 1988-03-28 1989-10-09

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