Photoelectric encoder having a plane mirror disposed parallel to

Details Photoelectric encoder having a plane mirror disposed parallel to Photoelectric encoder having a plane mirror disposed parallel to

1994-11-22

1995-12-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359727, 25023118, G01D 534

Patent

active

054790107

ABSTRACT:
A light emitting device assembled in a light transmitting type of photoelectric encoder is required to generate light having high parallelism and large quantity of light. This device uses one half of a concave mirror having a small aberration and long focal point. Hence, light radiated from a LED disposed at the focal point of the concave mirror has high parallelism. Further, using a plane mirror disposed at the optical axis of a concave mirror, light reflected with the plane mirror from a LED onto the concave mirror travels in parallel rays. Parallel rays, having a large quantity of light resulting from overlapping parallel rays, reflected from the concave mirror directly and indirectly from the light emitting element can be obtained.

REFERENCES:
patent: 4499374 (1985-02-01), Kabaya
patent: 4637691 (1987-01-01), Uehara et al.
patent: 4691101 (1987-09-01), Leonard
patent: 4770528 (1988-09-01), Imura et al.
patent: 4840488 (1989-06-01), Kabaya et al.
patent: 5155355 (1992-10-01), Kabaya

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