Aperture stop mechanism which drives two aperture blades and adjusts an aperture area of light passage opening into which light for imaging is introduced
US8657510B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2010 |
| Grant date | Feb 25, 2014 |
| Priority date | — |
| Expiry date | Nov 26, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an aperture stop mechanism, two aperture blades are arranged so as to overlap each other and form a single light passage opening into which light utilized in imaging is introduced with the respective edge portions of the two aperture blades. A drive mechanism drives the two aperture blades in directions different from each other, whereby the aperture area of the light passage opening is changed within a predetermined range. When the two aperture blades are located at a minimum aperture position where the aperture area of the light passage opening is minimum within the predetermined range, the two aperture blades are provided so that the single light passage opening surrounded by boundaries including eight straight lines is constituted of the respective edge portions of the two aperture blades.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.