Photoelectric conversion unit having a plurality of...

Details Photoelectric conversion unit having a plurality of... Photoelectric conversion unit having a plurality of...

2006-01-03

2006-01-03

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S206200, C345S158000

Reexamination Certificate

active

06982407

ABSTRACT:
A pointing position or direction is accurately determined with a simple constitution without burden to a user. A pair of PDs (photodiodes) forming one photoelectric conversion unit provide a light receiving surface of valley fold with respect to a light source, and another pair of PDs forming the photoelectric conversion unit provide a light receiving surface of mountain fold with respect to the light source. In the same manner, a pair of PDs forming another photoelectric conversion unit provide a light receiving surface of valley fold, and another pair of PDs forming the photoelectric conversion unit provide a light receiving surface of mountain fold. The outputs from the light receiving surfaces of valley fold and mountain fold are averaged in the respective photoelectric conversion units to countervail an error caused from the both, whereby the position of the light source can be accurately located.

REFERENCES:
patent: 4225781 (1980-09-01), Hammons
patent: 5393970 (1995-02-01), Shau et al.
patent: U 5-25525 (1993-04-01), None
patent: A 10-9812 (1998-01-01), None

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