Position detection encoder having plural light receiving and lig

Details Position detection encoder having plural light receiving and lig Position detection encoder having plural light receiving and lig

1990-10-25

1992-06-30

Pellinen, A. D.

Coded data generation or conversion

Digital pattern reading type converter

Optical

25023118, H03M 130

Patent

active

051267365

ABSTRACT:
A position detection encoder includes a code plate having a plurality of slots formed therein, a first light emitting element and a first light receiving element disposed on one side of the code plate, and a second light emitting element and a second light receiving element disposed on another side of the code plate. A first light beam emitted from the first light emitting element and received by the second light receiving element passes simultaneously through a same one of the plurality of slits of the code plate as does a second light beam emitted from the second light emitting element and received by the first light emitting element. Detection signals having differing phases are respectively obtained from the first and second light receiving elements.

REFERENCES:
patent: 4580047 (1986-04-01), Sasaki et al.
patent: 4680466 (1987-07-01), Kuwahara et al.
patent: 4990932 (1991-02-01), Houston
patent: 5021781 (1991-06-01), Salazar et al.

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