Lens controller

Details Lens controller Lens controller

1997-09-09

1999-03-16

Perkey, W. B.

Photography

Having variable focal length of camera objective

Power zoom

396131, 348357, 348358, G03B 310

Patent

active

058841075

ABSTRACT:
A signal determining circuit determines the voltage of a control signal which is output according to a rotational angle of a thumb ring. When the determined voltage of the control signal is lower than a predetermined cutoff voltage, an armature of a switch means is made to contact a point of contact which is grounded, so that the control signal can be interrupted. On the other hand, when the determined voltage of the control signal is higher than the cutoff voltage, the armature of the switch means is made to contact the other point of contact so as to input the control signal to a driving circuit, and a servo motor is driven according to the control signal, so that a zoom lens can be moved to the tele side or the wide side. Thereby, it is possible to prevent the lens from operating incorrectly and to effectively eliminate an unstable area in a circuit which has a wide dynamic range.

REFERENCES:
patent: 5493357 (1996-02-01), Hara et al.

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