Light amount adjustment apparatus, manufacturing method, and photographing apparatus
US6866431B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2003 |
| Grant date | Mar 15, 2005 |
| Priority date | — |
| Expiry date | Feb 19, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/02
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.