JPS5565112A - Position detector - Google Patents

Position detector

Info

Publication number
JPS5565112A
JPS5565112A JP13925078A JP13925078A JPS5565112A JP S5565112 A JPS5565112 A JP S5565112A JP 13925078 A JP13925078 A JP 13925078A JP 13925078 A JP13925078 A JP 13925078A JP S5565112 A JPS5565112 A JP S5565112A
Authority
JP
Japan
Prior art keywords
detectors
pulse
duty
phase difference
photo
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
JP13925078A
Other languages
Japanese (ja)
Inventor
Takemi 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.)
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 JP13925078A priority Critical patent/JPS5565112A/en
Publication of JPS5565112A publication Critical patent/JPS5565112A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Transform (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

PURPOSE: To enable the detection not subjected to temperature and voltage variation, by shifting the first and second index group for detected member and obtaining the pulse output of duty 1/2 so that the phase difference between the output signals of first and second detectors can be avoided to be 2nπ.
CONSTITUTION: The detected plate 5 fixed on the base has the index groups 7 and 8 consisting of a number of slits 6 up and down in the state that they are shifted each other. The light emitting element 9 and the photo detectors 10 and 11 as the first and second detectors are located up and down opposingly in front and at the back of the slit 6 group of the indices 7, 8 and fixed to the mobile body. The photo detectors 10, 11 consist of the photo transistors (PT) 10a and 11a and have the same characteristics and the common emitter is taken. Accompanied with the shift of mobile body, sinusoidal waves having the phase difference not being 2nπ (n= 0, ±1, ±2...) are outputted with the position shift of the index groups 7, 8 from PT10a, 11a, and the outputs are compared at the differential amplifier 14 to obtain the pulse outout of duty 1/2 and the position detection pulse is obtained.
COPYRIGHT: (C)1980,JPO&Japio
JP13925078A 1978-11-10 1978-11-10 Position detector Pending JPS5565112A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13925078A JPS5565112A (en) 1978-11-10 1978-11-10 Position detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13925078A JPS5565112A (en) 1978-11-10 1978-11-10 Position detector

Publications (1)

Publication Number Publication Date
JPS5565112A true JPS5565112A (en) 1980-05-16

Family

ID=15240933

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13925078A Pending JPS5565112A (en) 1978-11-10 1978-11-10 Position detector

Country Status (1)

Country Link
JP (1) JPS5565112A (en)

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