Lens barrel with improved drum arrangement
US5381272A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1993 |
| Grant date | Jan 10, 1995 |
| Priority date | — |
| Expiry date | Jan 22, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens barrel including a fixed drum, a rotary drum rotatably fitted in the fixed drum and a lens drum, disposed in the rotary drum, for accommodating lens. The lens drum is movable in the optical-axis direction of the lens with a rotation of the rotary drum. The lens barrel has an adjusting drum disposed in a subject-side position between the fixed drum and the rotary drum. The adjusting drum thread-engages with the fixed drum. The adjusting drum is, when rotated, moved in the optical-axis direction. With this movement, the rotary drum and the lens drum also move in the optical-axis direction, thus adjusting a relative position of the rotary drum with respect to the fixed drum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.