Photodetector with mask for stable output signal

Details Photodetector with mask for stable output signal Photodetector with mask for stable output signal

1991-11-04

1993-06-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502141, H01J 314

Patent

active

052162486

ABSTRACT:
A photodetector, for use as a scanning light beam detector in an optical scanner, has a light-detecting element having a light-detecting surface for detecting a scanning light beam. The photodetector has a slit film which has a light-transmissive section for allowing light to be applied to the light-detecting surface and a light-blocking section for blocking light from the light-detecting surface. The slit film is disposed directly on the light-detecting surface. The slit film is evaporated or printed directly on the light-detecting surface. Therefore, the scanning light beam is applied to a desired light-incident area of the light-detecting surface which is positioned and dimensioned with high accuracy. The slit film needs no complex procedure for fine positional adjustment as it is fixedly positioned with respect to the light-detecting element.

REFERENCES:
patent: 3179808 (1965-04-01), Grey et al.
patent: 3237012 (1966-02-01), Treffeisen
patent: 4663524 (1987-05-01), Gale et al.
patent: 4746793 (1988-05-01), Hopkins
patent: 4847492 (1989-07-01), Houki
patent: 4850692 (1989-07-01), Hirao et al.
patent: 5065015 (1991-11-01), Horiguchi et al.

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