Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2007-08-07
2008-10-07
Epps, Georgia Y. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C369S044410, C369S112030, C359S015000
Reexamination Certificate
active
07432487
ABSTRACT:
Light receiving elements for receiving a + one-dimensional light divided into four are arranged in the vicinity of a light receiving part for receiving the zero-dimensional light. Some light receiving elements configure the light receiving elements of a first group for receiving the + one-dimensional light forming a focus on the front side of the light receiving surface, and the other light receiving elements configure the light receiving elements of a second group for receiving the + one-dimensional light forming a focus on the rear side of the light receiving surface. A correction value is calculated based on a difference in the outputs of the light receiving elements belonging to the first group and a difference in the outputs of the light receiving elements belonging to the second group, and the focus error signal is corrected using the correction value.
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Bennett Jennifer
Epps Georgia Y.
Funai Electric Co. Ltd.
Osha & Liang LLP
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