Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-12-30
1994-01-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
2502017, G01J 120
Patent
active
052763188
ABSTRACT:
An optical apparatus includes a first motor arranged to vary a magnifying power, a second motor arranged to make compensation when the first lens moves and also to adjust focus, a first motor arranged to move the first lens in the direction of an optical axis, a stepping motor being arranged as the first motor, a second motor arranged to move the second lens in the direction of the optical axis, a detecting part arranged to detect the position of the first lens on the basis of the number of driving pulse steps of the first motor, a memory circuit arranged to store information on adequate second lens moving positions in relation to specific moving positions of the first lens, and a control circuit arranged to control a driving action of the second motor on the basis of information on the position of the first lens detected by the detecting part and the information on the adequate moving position of the second lens.
REFERENCES:
patent: 4912496 (1990-03-01), Tamada et al.
Canon Kabushiki Kaisha
Nelms David C.
LandOfFree
Optical apparatus with lens position detection and control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical apparatus with lens position detection and control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical apparatus with lens position detection and control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-309736