Apparatus with lens control device

Details Apparatus with lens control device Apparatus with lens control device

1990-04-19

1992-09-01

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359698, 359767, 354400, 358225, G02B 1500

Patent

active

051444917

ABSTRACT:
An optical apparatus comprises a first lens to be used for changing a magnifying power; a second lens to be used for focus adjustment and also for compensation required when the magnifying power is varied; a focus detecting circuit for detecting an in-focus state; a first control circuit for driving the second lens to an in-focus position on the basis of information obtained by the focus detecting circuit; a detecting circuit for detecting the position of the second lens; and a second control circuit for driving the second lens to a normal focus adjustable position after driving the second lens to a reset position for the purpose of enabling the detecting circuit to perform a detecting action. The second control circuit is arranged to drive the second lens from the reset position to the focus adjustable position at a higher speed than the driving speed set by the first control circuit.

REFERENCES:
patent: 4161756 (1979-07-01), Thomas
patent: 4885600 (1989-12-01), Iwasa et al.
patent: 4920369 (1990-04-01), Kaneda et al.
patent: 4950054 (1990-08-01), Wada et al.
patent: 4975724 (1990-12-01), Hirasawa et al.
patent: 5016993 (1991-05-01), Akitake

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