Image surface illuminance varying apparatus, exposure correcting apparatus, and exposure correcting method
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United States of America Patent
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Jun 14, 2011
Grant Date -
Dec 17, 2009
app pub date -
Aug 24, 2009
filing date -
Jan 20, 2005
priority date (Note) -
Expired
status (Latency Note)
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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.
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