Emitting light source apparatus for use in optical encoder

Details Emitting light source apparatus for use in optical encoder Emitting light source apparatus for use in optical encoder

2006-06-06

2006-06-06

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S239000, C356S616000

Reexamination Certificate

active

07057159

ABSTRACT:
A light-emitting chip mounted on a leadframe has a light-emitting surface substantially orthogonal to an optical grating surface of a scale and in a direction of an optical grating. A transparent resin is molded so that it seals both the light-emitting chip and the leadframe. A first optical element reflects the light from the light-emitting chip substantially parallel to the optical grating surface and in a direction orthogonal to the direction of the optical grating. A second optical element reflects the parallel light from the first optical element and illuminates the optical grating over a specified area in the direction of the optical grating as the reflected parallel light is converged toward the optical grating.

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English translationof Yasuda JP 01-097813.

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