Camera system and camera lens control unit

Details Camera system and camera lens control unit Camera system and camera lens control unit

1997-12-12

1999-04-13

Perkey, W. B.

Photography

Having variable focal length of camera objective

Power zoom

396131, 396260, 348357, 348358, 348362, G03B 310, G03B 700

Patent

active

058936513

ABSTRACT:
In order to connect a stepping motor driven type camera unit to a camera control unit intended for a DC motor driven type camera apparatus, a camera system includes a lens block provided with a stepping motor for adjusting lens operation, an A/D conversion block for converting a DC control signal ranging from positive to negative polarity into a digital signal to be outputted, a shift direction/velocity calculation block which generates and outputs data on lens shift direction and velocity according to the digital signal from the A/D conversion block, and a pulse signal generation block for outputting a pulse signal according to the data from the shift direction/velocity calculation block.

REFERENCES:
patent: 4417280 (1983-11-01), Yokoyama et al.
patent: 5028945 (1991-07-01), Kashihara et al.
patent: 5057927 (1991-10-01), Hieda
patent: 5463442 (1995-10-01), Harigaya et al.
patent: 5633680 (1997-05-01), Kaneko et al.

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