Lens apparatus and camera system

Details Lens apparatus and camera system Lens apparatus and camera system

2011-06-14

2011-06-14

Perkey, W. B. (Department: 2862)

Photography

Having variable focal length of camera objective

Having focus operation

C359S698000, C396S530000, C348S350000

Reexamination Certificate

active

07962028

ABSTRACT:
A lens apparatus comprises a barrel100which houses an imaging optical system including magnification-varying lens units26and27, a focus lens unit25, and a beam separation element29which separates a part of a light beam from an object out of a light beam directed to an imaging surface, operating members1, 2, and3disposed on an outer circumference of the barrel and configured to be manually operated, a drive unit200disposed outside the barrel and including actuators45and50which drives each of the magnification-varying lens unit and the focus lens unit, and a controller60which controls the actuator, and a focus detector31disposed outside the barrel and configured to detect a focus state of the imaging optical system using the light beam separated by the beam separation element. The focus detector is embedded in the drive unit.

REFERENCES:
patent: 3940777 (1976-02-01), Komine
patent: 4333716 (1982-06-01), Sakane et al.
patent: 2003/0173494 (2003-09-01), Nakamura
patent: 2008/0043351 (2008-02-01), Hirakawa
patent: 2010/0110236 (2010-05-01), Kurokawa et al.
patent: 55-076312 (1980-06-01), None

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