Method of monitoring focusing condition using rate of change sig

Details Method of monitoring focusing condition using rate of change sig Method of monitoring focusing condition using rate of change sig

1990-10-24

1992-05-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502017, 250561, G01J 120, G01N 2186

Patent

active

051130637

ABSTRACT:
Disclosed is a method of monitoring the state of focusing of an image on a semiconductor image position sensitive device of the type having a photosensitive layer, a resistance layer provided on the photosensitive layer and output terminals provided on the resistance layer. In this method, a bright spot image is moved across a border between a light-insensitive or non-sensitive zone and a light-sensitive zone. The rate of change in the level of an output signal obtained when the bright spot image is moved across the border is then detected. The degree of focusing of the bright spot image is then derived from the state of change in the level of the output signal.

REFERENCES:
patent: 4445029 (1984-04-01), Nagaoka et al.
patent: 4829171 (1989-05-01), Katsumura
patent: 4990771 (1991-02-01), Minoura et al.

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