Optical apparatus

Details Optical apparatus Optical apparatus

1990-06-19

1991-10-22

Perkey, W. B.

Optical: systems and elements

Prism

With reflecting surface

359684, 359698, 358227, 3541951, G03B 1336, G03B 500, G02B 709

Patent

active

050600010

ABSTRACT:
An optical apparatus comprises a first lens for effecting magnification change, a second lens provided more adjacent to the focal plane than the first lens for effecting focusing and correction during the magnification change, driving means for moving the first and second lenses along the optical axis thereof, detecting means for detecting the positions of the first and second lenses, and control means for controlling the second lens so as not to move to an area in which continuous in-focus cannot be maintained to an object at a close distance, during the movement of the first lens from the telephoto to the wide end.

REFERENCES:
patent: 4920369 (1990-04-01), Kaneda et al.
patent: 4950054 (1990-08-01), Wada et al.
patent: 4975724 (1990-12-01), Hirasawa et al.

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