Light receiving device for optical encoder, and optical...

Details Light receiving device for optical encoder, and optical... Light receiving device for optical encoder, and optical...

2006-12-05

2006-12-05

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

Reexamination Certificate

active

07145128

ABSTRACT:
A light receiving device for an optical encoder comprises: a plurality of first photodiodes juxtaposed in a first direction and extending in a second direction that is generally vertical to the first direction; and a light shielding layer. The light shielding layer is are provided on the plurality of first photodiodes, and have openings provided so that, when a scale having a transmitting pattern and a light shielding pattern is moved along the second direction, at least one and at least another of the plurality of first photodiodes are sequentially irradiated with light transmitted through the transmitting pattern.

REFERENCES:
patent: 4691101 (1987-09-01), Leonard
patent: 4904861 (1990-02-01), Epstein et al.
patent: 6906311 (2005-06-01), Kojima
patent: 2004/0200958 (2004-10-01), Tanaka et al.
patent: 2001-99684 (2001-04-01), None

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