Drive apparatus and drive control apparatus for optical system of camera
US5172149A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1991 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | May 22, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/102
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A drive apparatus for driving an optical system of a camera in directions along an optical axis of the optical system through an electric motor. The drive apparatus is equipped with a manual ring provided in a housing of the optical system so as to be manually rotatable about the optical axis of the optical system. The manual ring is fixedly secured to a rotatable plate having a plurality of tooth portions. Also included in the drive apparatus is a rotation detector arranged to be associated with the plurality of tooth portions of the rotatable plate so as to detect the rotation of the manual ring to output a detection signal indicative of the rotation information of the manual ring. A control section is responsive to the detection signal from the rotation detector so as to output a control signal to the electric motor so that the optical system is driven at a speed corresponding to the frequency of the detection signal therefrom. This arrangement allows high-accurate position control of the optical system of the camera at a speed proportional to the rotational speed of the manual ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.