TV camera lens driving device and TV camera lens

Details TV camera lens driving device and TV camera lens TV camera lens driving device and TV camera lens

1997-11-12

1998-10-20

Perkey, W. B.

Photography

Having variable focal length of camera objective

Having focus operation

348357, 348358, 359705, 359823, 396103, G03B 310, G03B 1334, G02B 7105

Patent

active

058261176

ABSTRACT:
A TV camera lens of the present invention is provided with a position-control signal generating means for outputting a position-control signal representing a position where a master lens group should be positioned, and a rate-control signal generating means for outputting a rate-control signal representing a rate at which the master lens group should be moved. A position/rate control changeover means validates one of the position-control signal generating means and the rate-control signal generating means. A control circuit drives a motor to move the master lens group according to the rate-control signal or the position-control signal which is validated by the position/rate control changeover means. The TV camera lens is also provided with a limit circuit. A limit position, at which the master lens group stops when the master lens group moves under the rate control, is set to a proper flange back length position, which is adjusted under the position control. Thus, the master lens group can return to a previously-adjusted flange back length position under the rate control without fail.

REFERENCES:
patent: 4567526 (1986-01-01), Tsuchiya
patent: 5075713 (1991-12-01), Sakata

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