Automatic focusing system

Details Automatic focusing system Automatic focusing system

1982-03-22

1983-11-15

Marcus, Stephen

Optics: image projectors

Lens support

Lens position adjustable

353 69, 355 56, 354 25, G03B 300

Patent

active

044152442

ABSTRACT:
An automatic focusing system for a slide projector which utilizes a pair of photocells is provided with a non-linear response characteristic to introduce a change in the sensor balance point when a glass covered film slide is projected as opposed to when an open film slide is projected. Accordingly, glass covered film slides and open film slides can be randomly intermixed without changing the projector focus.

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