Photosensor and image scanner utilizing the same

Details Photosensor and image scanner utilizing the same Photosensor and image scanner utilizing the same

1991-03-05

1992-10-06

Hannaher, Constantine

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250235, 250236, 357 30, 358494, H01L 2714, H01L 310232

Patent

active

051534223

ABSTRACT:
A photosensor (20a) has a pair of n-type semiconductor layers (21U, 21D) formed on the major surface of a p-type semiconductor substrate (31). A light-shielding pattern (24) comprised of unit light-shielding layers (33) is formed on the major surface of the substrate. When the major surface is scanned by a light beam in the direction (D.sub.X) in which the unit light-shielding layers are aligned, a couple of photo-conversion signals indicating a current position of the light beam on the photosensor are generated in the photosensor. Since the light-shielding pattern is directly provided on the sensor body, no grating glass is required other than the photosensor.

REFERENCES:
patent: 4214157 (1980-07-01), Check, Jr. et al.
patent: 4661699 (1987-04-01), Welmers et al.
patent: 4837588 (1989-06-01), Imakawa et al.
patent: 4882490 (1989-11-01), Takasaki et al.

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