Displacement mechanism control device in a camera

Details Displacement mechanism control device in a camera Displacement mechanism control device in a camera

1997-01-08

1999-05-18

Gray, David M.

Photography

Having variable focal length of camera objective

Power zoom

G03B17/00

Patent

active

059059184

ABSTRACT:
A camera displacement mechanism control device can maintain the time required to effect removal of backlash within a set time. Zooming-down is started by the zoom-down switch being turned ON, and the lens barrel is driven as far as the wide-angle terminus if the zoom-down switch is not turned OFF during zooming-down. Alternatively, if the zoom down switch is turned OFF during zooming-down, the lens barrel is driven to the next halt position after the position where the zoom-down switch was turned OFF. In either case, the lens barrel is caused to overshoot the target halt position in the direction of scrolling-in for a time interval long enough to effect removal of backlash, and is subsequently driven in the direction of scrolling-out and halted at the described target halt position.

REFERENCES:
patent: 4908647 (1990-03-01), Ueyama
patent: 4936664 (1990-06-01), Haraguchi et al.
patent: 5210558 (1993-05-01), Kobayshi et al.
patent: 5237362 (1993-08-01), Ishino et al.

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