Lens barrel
US5301066A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1992 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Jun 25, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/102
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens barrel of the present invention directly detects the lens-to-lens spacing between a focusing lens and another lens, whose position relative to the focusing lens exerts the largest influence upon a focused condition, by a measurement detector and, depending on an output indicative of the measured spacing, a controller drives the focusing lens through a driver to a proper in-focus condition. Accordingly, a very valuable advantage results in that a focusing position error of the focusing lens group, which has been encountered in the prior art, can be avoided to enable effective and high-accuracy focusing operation and control through a simplified structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.