Lens barrel having collapsing and extending use grooves
US5687029A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1996 |
| Grant date | Nov 11, 1997 |
| Priority date | — |
| Expiry date | Apr 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/102
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens barrel having first and second lens groups and first and second tubes. The first tube has first and second guide grooves to respectively guide the first and second groups in an optical direction. The second tube has first and second cam grooves to respectively guide the first and second lens groups, in conjunction with the first and second guide grooves, for focusing and zooming operations. A first collapsing use groove extends substantially perpendicular to the optical axis from an end of the second guide groove that is closer to an image surface to maintain the second lens group in a stationary position on the optical axis when the first lens group is collapsed toward the second lens group and when the first lens group is extended into a wide state. A second collapsing use groove extends substantially perpendicular to the optical axis from an end of the second cam groove that is closer to the image surface and overlaps the first collapsing use groove to perform the same functions as the first collapsing use groove. The first cam groove is inclined with respect to the optical axis and the second cam groove includes a wide state focusing portion extending substantially paral…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.