Position control device for use in a camera
US4835558A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1987 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Nov 20, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/07
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A position control device which comprises a ratch wheel adapted to rotate in interlock with motion of an object to be positioned, a rotation detecting unit adapted to detect an amount of rotation of the ratch wheel, a combination solenoid provided with a pawl and adapted to be driven in a direction of bringing the pawl into engagement with the ratch wheel and in a direction of separating the pawl from the ratch wheel, and a combination solenoid control unit adapted to actuate the aforementioned combination solenoid in such a manner as to bring the pawl into engagement with the ratch wheel to set the object at a prescribed position when the aforementioned rotation detecting unit detects that the amount of the rotation of the ratch wheel has reached a prescribed level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.