Light-amount adjusting apparatus, optical apparatus, and...

Details Light-amount adjusting apparatus, optical apparatus, and... Light-amount adjusting apparatus, optical apparatus, and...

2011-03-15

2011-03-15

Phan, James (Department: 2872)

Optical: systems and elements

Light control by opaque element or medium movable in or...

With rotating or pivoting element

C359S227000, C359S230000, C396S510000

Reexamination Certificate

active

07907321

ABSTRACT:
A light-amount adjusting apparatus includes a plurality of light-amount adjusting blades that causes a size of a light-passing aperture to change by rotation thereof. Each of the light-amount adjusting blades includes a base portion on which a rotation center portion and a driven portion are formed, and a blade portion that overlaps another light-amount adjusting blade in a light-passing direction so as to form the light-passing aperture. A thickness of the blade portion is thinner than that of the base portion. When the plurality of light-amount adjusting blades is rotated to set the light-passing aperture to be smaller than a full-opened aperture, a thickness of a portion that overlaps an adjacent stop blade is thinner than that of a portion that does not overlap the adjacent stop blade in each of the light-amount adjusting blades. The blades have high dimension accuracy, and deterioration of the optical performance of the apparatus is reduced.

REFERENCES:
patent: 6858959 (2005-02-01), Aoshima
patent: 7290947 (2007-11-01), Naganuma

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