Image surface illuminance varying apparatus, exposure...

Details Image surface illuminance varying apparatus, exposure... Image surface illuminance varying apparatus, exposure...

2011-06-14

2011-06-14

Hannett, James M (Department: 2622)

Television

Camera, system and detail

Optics

C348S335000, C348S240300, C348S229100

Reexamination Certificate

active

07961245

ABSTRACT:
An image surface illuminance varying apparatus includes a variable power optical system in which the optical power thereof can be varied by changing a relative position of a plurality of optical elements thereof; and a light-quantity ratio varying optical element whose transmittance varies in a direction perpendicular to an optical axis of the variable power optical system, the light-quantity ratio varying optical element being located in a light path of the variable power optical system to reduce an illuminance difference of an imaging surface. A distance from the light-quantity ratio varying optical element, which is moved along the optical axis, to a diaphragm or a shutter is varied in accordance with the power varying operation.

REFERENCES:
patent: 3981565 (1976-09-01), Karasawa
patent: 6754008 (2004-06-01), Wallerstein et al.
patent: 7019917 (2006-03-01), Sato et al.
patent: 2003/0235410 (2003-12-01), Kurosawa
patent: 2004-184708 (2004-02-01), None
patent: 2004-258494 (2004-09-01), None
English language Abstract of JP 2004-258494, Sep. 16, 2004.

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