Drive controller of a lens apparatus

Details Drive controller of a lens apparatus Drive controller of a lens apparatus

2007-08-07

2007-08-07

Perkey, W. B. (Department: 2851)

Photography

Having variable focal length of camera objective

Having focus operation

C348S347000, C359S698000, C396S131000, C396S137000

Reexamination Certificate

active

11103051

ABSTRACT:
A drive controller of a lens apparatus including a first lens unit moving for performing manual focus and a second lens unit moving for performing auto-focus has a control device switchable between a first mode for performing an auto-focus control of the second lens unit and a second mode for making the second lens unit unmovable at a predetermined position. The control device has a third mode for controlling drive of the second lens unit, upon receiving a command for switching from the first mode to the second mode, so as to maintain a focus state of the lens apparatus, on the basis of positional information of the first lens unit. The controller moves to the second mode upon detecting that the second lens unit has reached the predetermined position in the third mode.

REFERENCES:
patent: 4609260 (1986-09-01), Kawai
patent: 5075713 (1991-12-01), Sakata
patent: 5420721 (1995-05-01), Kanno
patent: 6847495 (2005-01-01), Nurishi
patent: 7099089 (2006-08-01), Yakita et al.
patent: 2002/0127012 (2002-09-01), Okawara
patent: 1396746 (2004-03-01), None
patent: 62-247316 (1987-10-01), None

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