Photoelectric encoder and electronic equipment using the same

Details Photoelectric encoder and electronic equipment using the same Photoelectric encoder and electronic equipment using the same

2007-08-29

2008-10-21

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C341S013000

Reexamination Certificate

active

07439489

ABSTRACT:
In the photoelectric encoder of the invention, as a light passing zone PZ of a movable object21travels by one pitch P, an output signal OUT2of a second logical operation unit26bcomes to be delayed in phase by 45° with respect to an output signal OUT1of a first logical operation unit26a. Therefore, an output having a resolution two times higher than that of the movable object having a phase difference of 90° can be obtained, where the width of each of light receiving elements22a-22dis (¼)P. Accordingly, the width of each of the light receiving elements can be made two times larger, compared with the case where the width of each of the light receiving elements is (⅛)P as in conventional optical encoders. Thus, the output strength of the detection signal can be increased, so that the S/N ratio can be improved.

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