Power focus device in a camera

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

3541951, 354409, G03B 300

Patent

active

048643440

ABSTRACT:
A power focus device in a camera has a manually rotatively operated focus ring, a lens driving drive source for driving a focusing lens, and a pulse generating device operatively associated with the rotation of the focus ring to generate a pulse signal conforming to the amount of rotation of the focus ring. A focus ring rotation direction detecting device detects the direction of rotation of the focus ring from the pulse signal, a focus ring rotation amount detecting device detects the amount of rotation of the focus ring from the pulse signal, and a drive direction setting device sets the direction of drive of the lens driving drive source on the basis of the result of the detection in the focus ring rotation direction detecting device. A drive amount setting device memorizes the result of the detection in the focus ring rotation amount detecting device and sets the memorized value as the amount of drive of the lens driving drive source. A drive source control device control the lens driving drive source in accordance with the direction of drive set in the drive direction setting device and the amount of drive set in the drive amount setting device. A reversing device immediately reverses the lens driving drive source, changes the setting in the drive direction setting device, returns the drive amount setting device to its initial state, and immediately reverses the lens driving drive source when the focus ring has been rotatively operated in a direction to drive the lens driving drive source in a second direction when the lens driving drive source is being driven in a first direction.

REFERENCES:
patent: 2618209 (1952-11-01), Silent
patent: 3486432 (1969-12-01), Norwood
patent: 3735686 (1973-05-01), Brewer et al.
patent: 4293206 (1981-10-01), Tokutani et al.
patent: 4568165 (1986-02-01), Ishibashi
patent: 4674854 (1987-06-01), Kawamura et al.
patent: 4699491 (1987-10-01), Ishimura

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Power focus device in a camera does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Power focus device in a camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power focus device in a camera will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-246744

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.