Automated focus point control device

Details Automated focus point control device Automated focus point control device

1993-06-09

1995-03-14

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 45, 354400, G03B 300

Patent

active

053980964

ABSTRACT:
An automated focus point control device wherein the focus point is aligned by adjusting a projection optical unit based on signals outputted from a sensor which detects the light transmitted through a boundary portion of a margin portion and a frame portion of a film.
An automated focus point control device wherein the focus position is determined by detecting a projected image contrast on a priority basis at three points including the center position and lateral positions at both sides of the center position within the adjusting range of a projecting system.

REFERENCES:
patent: 4902101 (1990-02-01), Fujihara
patent: 4988187 (1991-01-01), Kuriyama

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