JPS55164364A - Multiphase optical tachometer - Google Patents

Multiphase optical tachometer

Info

Publication number
JPS55164364A
JPS55164364A JP7234979A JP7234979A JPS55164364A JP S55164364 A JPS55164364 A JP S55164364A JP 7234979 A JP7234979 A JP 7234979A JP 7234979 A JP7234979 A JP 7234979A JP S55164364 A JPS55164364 A JP S55164364A
Authority
JP
Japan
Prior art keywords
photodetectors
shaft
rotation
emitting element
light emitting
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
JP7234979A
Other languages
Japanese (ja)
Inventor
Isao Sotooka
Takashi Nagai
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7234979A priority Critical patent/JPS55164364A/en
Publication of JPS55164364A publication Critical patent/JPS55164364A/en
Pending legal-status Critical Current

Links

Landscapes

  • Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
  • Optical Transform (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

PURPOSE: To make it possible to discriminate easily the rotation speed and the rotation direction, by substituting the shaft of a rotary material for the slit of the rotary material and by making one light emitting element and plural photodetectors opposite to each other through the rotation axis.
CONSTITUTION: The tip of shaft 11 is cut off at 45° for the center, and the cut surface is made into mirror face A. When one light emitting element 12 and, for example, two photodetectors 13 and 14 are arranged horizontally, a light is irradiated to photodetectors 13 and 14 intermittently by rotation of shaft 11. The rotation speed as well as the rotation direction can be detected by the phase difference between output waveforms of photodetectors 13 and 14. In case that it is difficult to process shaft 11, a piece having the mirror face at 45° for the center may be fitted to the tip of shaft 11. Consequently, a tachometer which can discriminate the rotation speed and the rotation direction can be obtained easily by arranging one light emitting element and photodetectors corresponding to the number of phases.
COPYRIGHT: (C)1980,JPO&Japio
JP7234979A 1979-06-11 1979-06-11 Multiphase optical tachometer Pending JPS55164364A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7234979A JPS55164364A (en) 1979-06-11 1979-06-11 Multiphase optical tachometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7234979A JPS55164364A (en) 1979-06-11 1979-06-11 Multiphase optical tachometer

Publications (1)

Publication Number Publication Date
JPS55164364A true JPS55164364A (en) 1980-12-22

Family

ID=13486733

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7234979A Pending JPS55164364A (en) 1979-06-11 1979-06-11 Multiphase optical tachometer

Country Status (1)

Country Link
JP (1) JPS55164364A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6834174B2 (en) * 2001-02-26 2004-12-21 Canon Kabushiki Kaisha Image forming apparatus and rotary body detection device
JP2009017745A (en) * 2007-07-09 2009-01-22 Sanyo Electric Co Ltd Geared motor having optical sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6834174B2 (en) * 2001-02-26 2004-12-21 Canon Kabushiki Kaisha Image forming apparatus and rotary body detection device
JP2009017745A (en) * 2007-07-09 2009-01-22 Sanyo Electric Co Ltd Geared motor having optical sensor

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