Lens barrel and camera
US6853499B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 2003 |
| Grant date | Feb 8, 2005 |
| Priority date | — |
| Expiry date | Oct 20, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/023
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A cam cylinder is provided with a first group cam and a second group cam, respectively. A first group lens system and a second group lens system are engaged through a first group driving pin and a second group driving pin with the first and second group cams, respectively. The first and second group lens systems are biased by a spring and are placed under a biased force acting in the opposite directions along an optical axis. The first and second group cams have large cam angles in the vicinity of a starting position for collapsing in which a spring force is small, and the cam angles are reduced continuously in response to an increment of the spring force, and the cam angles become minimum in the vicinity of a collapsed position in which the spring force is maximum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.