Auto-focus apparatus applied to image reading apparatus and the

Details Auto-focus apparatus applied to image reading apparatus and the Auto-focus apparatus applied to image reading apparatus and the

1986-04-22

1988-08-09

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356444, G03B 2734, G02B 711

Patent

active

047629851

ABSTRACT:
In an auto-focus apparatus of the invention, an image sensor (e.g., a CCD) produces an image signal corresponding to an image on a microfilm. The image signal from the image sensor is encoded to a binary image signal by a binary encoding circuit. Alternation points (i.e., leading or trailing edges) of the binary image signal are counted by a counter. A system controller fetches count values from the counter, and detects an image position corresponding to a maximum count value. The system controller causes a lens driving circuit to move an imaging lens to the detected image position.

REFERENCES:
patent: 4435079 (1984-03-01), Hennick
patent: 4492449 (1985-01-01), Oinoue et al.
patent: 4551023 (1985-11-01), Nakauchi
patent: 4638364 (1987-01-01), Hiramutsu
patent: 4653926 (1987-03-01), Fukui
patent: 4674126 (1987-06-01), Kotera
patent: 4700237 (1987-10-01), Yoshioka et al.

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