Camera and lens barrel

Details Camera and lens barrel Camera and lens barrel

2005-06-28

2005-06-28

Perkey, W. B. (Department: 2851)

Photography

Having variable focal length of camera objective

Having focus operation

C396S103000, C396S147000, C396S088000

Reexamination Certificate

active

06912358

ABSTRACT:
At a lens group position storage unit, the positions of a focus lens group and a zoom lens group detected at the time of a preset operation are stored. In response to an instruction for a go-home operation, a zoom lens group position comparison unit compares the current zoom lens group position with the position detected at the time of the preset operation. If the zoom lens group position assumed when the instruction for the go-home operation is issued is further toward the telephoto side relative to the zoom lens group position at the time of the preset operation, a defocus prevention unit issues a warning so as to prevent defocusing.

REFERENCES:
patent: 4730201 (1988-03-01), Sasagaki
patent: 5227829 (1993-07-01), Imanari et al.
patent: 5815745 (1998-09-01), Ohsawa
patent: A 6-43353 (1994-02-01), None

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