Lens barrel in which motor capable of selecting stepping drive o

Details Lens barrel in which motor capable of selecting stepping drive o Lens barrel in which motor capable of selecting stepping drive o

1984-12-26

1987-01-27

Punter, William H.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 49R, 310112, G02B 704, H02K 2108

Patent

active

046390847

ABSTRACT:
A lens barrel provided therein with a hollow cylindrical permanent magnet having a permanent magnet portion for stepping drive and a magnet portion for brushless drive, a step driving coil and a brushless driving coil, and a focusing lens system axially moved by the rotary motion of the cylindrical permanent magnet. In case the amount of movement of the lens system required for bringing it to the focused position exceeds a determined value, the lens system is moved to a position corresponding to the determined value by the rotary motion of the brushless driving permanent magnet portion, and in case the above-mentioned amount is equal to or less than the determined value, the lens system is brought to the focused position by the rotary motion of the step driving permanent magnet portion.

REFERENCES:
patent: 2750522 (1956-06-01), Seiden
patent: 3549918 (1970-12-01), Hendrik et al.
patent: 3809990 (1974-05-01), Kuo et al.
patent: 3917394 (1975-11-01), Sturdevant

Affiliated with

Also associated with

Rating

Lens barrel in which motor capable of selecting stepping drive o does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lens barrel in which motor capable of selecting stepping drive o, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lens barrel in which motor capable of selecting stepping drive o will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-854982