Motor-driven zoom lens barrel
US5148199A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1991 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Feb 6, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A motor-driven zoom lens barrel including a zoom motor, a powered zooming mechanism which varies the focal length of a taking lens in accordance with the rotation of the zoom motor in the forward and reverse directions, a zoom operation ring which can be rotated, a rotational direction control circuit for rotating the zoom motor in the forward and reverse directions in accordance with the rotation of the zoom operation ring in the forward and reverse directions from a neutral position thereof, and a speed control circuit for controlling the rotational speed of the zoom motor in accordance with the angular displacement of the zoom operation ring from the neutral position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.