Varifocal lens

Details Varifocal lens Varifocal lens

1991-03-20

1993-08-17

Gray, David M.

35419512, G03B 1300

Patent

active

052373622

ABSTRACT:
A photographing optical system in a varifocal lens is constructed by only a main lens at a wide angle time and a sublens moved backward from the main lens at a telescopic time. A wide angle pattern for prescribing a focusing region at the wide angle time is proximately disposed backward from a focusing starting position at the wide angle time. A telescopic pattern for prescribing a focusing region at the telescopic time is proximately disposed forward from a focusing starting position at the telescopic time. A sliding brush 16 is disposed in a front group frame for holding the main lens and is slidably moved on the wide angle and telescopic patterns to detect the respective focusing regions of the main lens at focal lengths and the focusing starting positions. A focusing position of the lens system is detected by a digital signal generator composed of a rotary encoder rotated in association with the operation of a drive motor.

REFERENCES:
patent: 5005038 (1991-04-01), Ogawa et al.

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