Photosensor apparatus with light integration control

Details Photosensor apparatus with light integration control Photosensor apparatus with light integration control

1983-01-24

1985-10-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250204, 358213, H01J 4014

Patent

active

045476764

ABSTRACT:
A photosensor apparatus for detecting focal position or the like, which uses a plurality of light-receiving elements arranged in a matrix array, is disclosed. Simultaneous light integration is started with respect to all the light-receiving elements, while all the outputs of the light-receiving elements are progressively scanned immediately after the start of the simultaneous light integration. When at least one of the outputs reaches a first reference level, all the outputs are held. If at least one of the held outputs is above a second reference level of a different level, check as to whether all the outputs are below the second reference level is repeatedly done for progressively reducing light integration periods until all the outputs of the light-receiving elements are at a fixed level.

REFERENCES:
patent: 4297014 (1981-10-01), Nakamura et al.
patent: 4326127 (1982-04-01), Aoki et al.
patent: 4329577 (1982-05-01), Asano et al.

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