Optical apparatus

Details Optical apparatus Optical apparatus

2008-02-07

2008-12-09

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S698000

Reexamination Certificate

active

07463429

ABSTRACT:
An optical apparatus includes an optical system including first and second movable lens units independently movable in an optical axis direction, and a controller causing the first movable lens unit to wobble in the optical axis direction based on contrast information. The optical system satisfies |tk/L|<15, where tk represents a distance from an image plane position to an exit pupil position when the exit pupil position is closest to the image plane position, L represents an effective diagonal length of an image at the image plane position. The controller causes the second movable lens unit to wobble in the optical axis direction to reduce variation of the position of the exit pupil in association with the wobbling of the first movable lens unit. The apparatus is capable of suppressing image twitching while obtaining a high focusing performance.

REFERENCES:
patent: 7236305 (2007-06-01), Yakita
patent: 04-134307 (1992-05-01), None
patent: 04-134308 (1992-05-01), None
patent: 06-205267 (1994-07-01), None

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