Semiconductor chip detecting device for providing focusing and r

Details Semiconductor chip detecting device for providing focusing and r Semiconductor chip detecting device for providing focusing and r

1990-04-04

1991-09-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4441, G01J 120, G11B 700

Patent

active

050497332

ABSTRACT:
A photo detecting device has a photoelectric converting element formed on a semiconductor chip with the photoelectric converting element being divided into first and second light receiving regions. The photo detecting device further has a signal processing circuit formed on the same semiconductor chip. The signal processing circuit includes a subtracting element for subtracting an output signal from the second light receiving region from an output signal from the first light receiving region.

REFERENCES:
patent: 4736354 (1988-04-01), Yoshio
patent: 4737946 (1988-04-01), Yamashita et al.
patent: 4773053 (1988-09-01), Gottfried
patent: 4835378 (1989-05-01), Coops
patent: 4888754 (1989-12-01), Gleim
patent: 4904856 (1990-02-01), Nagahama et al.

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