Light quantity adjusting device and imaging apparatus
US9004786B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2014 |
| Grant date | Apr 14, 2015 |
| Priority date | — |
| Expiry date | Mar 6, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/40
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a light quantity adjusting device that adjusts size of a diaphragm opening centering on an optical axis of an optical system that includes: a first pair of a first and a second rectilinear diaphragm blades slidably arranged at positions opposing across the diaphragm opening in a direction moving to and from the optical axis on a plane orthogonal to the optical axis; a second pair of a third and a fourth rectilinear diaphragm blades slidably arranged at positions opposing across the diaphragm opening, in a direction orthogonal the first pair of blades move, and in a direction to and from the optical axis; and a driving unit that adjusts a size of the diaphragm opening by sliding the blades. The driving unit drives the blades so as to adjustably form and maintain a shape of an opening perimeter of the diaphragm opening in nearly similar shapes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.