Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-06-02
2000-08-08
Lee, John R
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023114, 25023116, G01D 5347
Patent
active
061005193
ABSTRACT:
A photo-detector based calculating means having a grating wheel with integrated lenses is provided. The photo-detector based calculating means having a grating wheel with integrated lenses includes a light source (1), a grating wheel (2), and a photo-detector (3), with the light emitted from the light source (1) impinging upon an input plane of the grating wheel (2). The photo-detector (3) has a set of photo-sensitive chips (31) to receive the working light beams emitted from the grating wheel (2). The input plane of the grating wheel (2) has a ring-shaped lens (24) to focus the light emitted from the light source (1). The output plane (23) of the grating wheel (2) has a plurality of tooth-shaped lenses (25), each projecting perpendicularly to the ring-shaped lens (24), which can focus the working beams after the working beams pass through the output plane (23), thus minimizing interference.
REFERENCES:
patent: 3598493 (1971-08-01), Fisher
patent: 3770970 (1973-11-01), Trump
patent: 4820918 (1989-04-01), Igaki et al.
patent: 5126560 (1992-06-01), Kraus
Hsieh Cheng-Liang
Lu Shu Fang
Wang Ching Shun
Chu Ming Hsiang
Hsieh Cheng-Liang
Lai Nelson
Lee John R
Liu Yu Shian
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