Auto focus camera, lens apparatus and camera system with a...

Details Auto focus camera, lens apparatus and camera system with a... Auto focus camera, lens apparatus and camera system with a...

2007-06-26

2007-06-26

Perkey, W. B. (Department: 2851)

Photography

With exposure objective focusing means, focusing aid, or...

Lens drive circuit or motor structure

Reexamination Certificate

active

11534469

ABSTRACT:
A camera comprising the following components is disclosed: a vibrating motor which drives a focus lens of an image-taking optical system, and a control circuit which controls the vibrating type motor to repeatedly drive and stop the focus lens, extracting higher frequency components from an image signal obtained from an image pickup device in each stopped state of the focus lens, and performing focus adjusting operation in accordance with a focus adjustment state of the image-taking optical system determined on the basis of the higher frequency components. The control circuit causes traveling wave vibration to be generated on the vibrating member of the vibrating type motor when the focus lens is driven and causes standing wave vibration to be generated on the vibrating member while the focus lens is stopped during the focus adjusting operation.

REFERENCES:
patent: 5036399 (1991-07-01), Mabuchi
patent: 6876391 (2005-04-01), Hashimoto
patent: 7133077 (2006-11-01), Higuma et al.
patent: 8-80073 (1996-03-01), None

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