Optical apparatus with plural lenses and focus adjustment

Details Optical apparatus with plural lenses and focus adjustment Optical apparatus with plural lenses and focus adjustment

1993-10-04

1995-04-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502017, G01J 120

Patent

active

054060699

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.

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