OPTICAL ENCODER UNIT AND OPTICAL ENCODER

OPTICAL ENCODER UNIT AND OPTICAL ENCODER

An optical encoder unit (31) includes: a light source (41) having a predetermined light distribution; an optical scale (11) having a polarizer whose polarization direction on a plane is along a predetermined direction, and whose polarization direction is changed according to rotation; and an optical...

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1. Verfasser: OGUCHI, TOSHIAKI
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS
MEASURING
MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE
MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
PHYSICS
TARIFF METERING APPARATUS
TESTING
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description An optical encoder unit (31) includes: a light source (41) having a predetermined light distribution; an optical scale (11) having a polarizer whose polarization direction on a plane is along a predetermined direction, and whose polarization direction is changed according to rotation; and an optical sensor unit (35) including a first photoreceiver (PD1), a second photoreceiver (PD2), a third photoreceiver (PD3), and a fourth photoreceiver (PD4) for receiving incident light that is light source light from the light source made incident on the respective photoreceivers by passing through or being reflected by the optical scale. An emitting surface of the light source and the optical sensor unit (35) are arranged at positions so as to receive a light intensity that is predetermined times greater or more than that corresponding to dark current of the optical sensor.
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language eng ; fre ; ger
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subjects ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS
MEASURING
MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE
MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
PHYSICS
TARIFF METERING APPARATUS
TESTING
title OPTICAL ENCODER UNIT AND OPTICAL ENCODER
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