Position adjusting apparatus of zoom lens barrel
US5349475A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1993 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Apr 16, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/102
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An adjusting apparatus of a zoom lens barrel is provided including a zoom mechanism in which the zooming is carried out by a rotation of a rotatable cam ring, a code plate provided on a linearly movable member which is linearly moved in an optical axis direction by the zoom mechanism, and a brush holder having brushes which come into contact with the code plate to detect a focal length thereof. The adjusting apparatus further includes a brush position adjusting mechanism which adjusts the position of the brush holder in the optical axis direction, and a device for confirming that the cam ring, whose reference angular position is varied in accordance with the adjustment of the brush holder by the brush position adjusting mechanism, is located at a predetermined angular position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.