Lens driving device
US5493357A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1994 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Sep 13, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A camera lens driving device of the present invention drives the lens at a constant speed while pressing force applied to an operating member by the operator is below a predetermined value and controls the lens driving speed according to pressing force after it exceeds the predetermined value. The lens driving device comprises a photo-taking lens, an actuator for driving the lens, an operating member for specifying a direction in which the lens is to be driven, a pressing force detector for detecting pressing force applied to the operating member to produce a variable output, and a drive controller responsive to an output of the pressing force detector for outputting a drive signal to the actuator. The drive controller includes first and second comparators and a drive signal output circuit. In response to the operating member being pressed the pressing force detector outputs a drive control signal to the drive controller. When pressing force to the operating member lies within the range from a first to a second predetermined value, the drive controller drives the lens at a low constant speed through the actuator. When the pressing force is increased to exceed the second predetermin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.