Light amount adjustment apparatus, manufacturing method, and...

Details Light amount adjustment apparatus, manufacturing method, and... Light amount adjustment apparatus, manufacturing method, and...

2005-03-15

2005-03-15

Nguyen, Judy (Department: 2851)

Photography

Camera detail

Diaphragm shutter unit

C396S505000, C359S888000, C359S889000, C359S894000, C348S362000

Reexamination Certificate

active

06866431

ABSTRACT:
There is disclosed a light amount adjustment apparatus for adjusting a state of a flux passed through an aperture having a predetermined aperture diameter, the apparatus comprising: a light amount adjustment member in which a first region having a predetermined transmittance to the flux and a second region for blocking the flux are disposed on the same base material. In the light amount adjustment apparatus, although an optical filter is integrally constituted with a diaphragm blade, there is little positional shift of an ND filter, a shape of the ND filter has a degree of freedom, deterioration of resolution of an image is improved for use in optical apparatuses such as a photographing apparatus, optical properties are superior, the whole apparatus can be miniaturized, and cost reduction of a product can be achieved.

REFERENCES:
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patent: 5585884 (1996-12-01), Onuki
patent: 5725959 (1998-03-01), Terada et al.
patent: 6046768 (2000-04-01), Kaneda et al.
patent: 6-95208 (1994-04-01), None
patent: 6-273601 (1994-09-01), None
patent: 7-104343 (1995-04-01), None
patent: 11-15042 (1999-01-01), None

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