Camera with vibration compensation device varying the compensating action in accordance with the focal length of a lens and the distance to the subject
US6332060A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1999 |
| Grant date | Dec 18, 2001 |
| Priority date | — |
| Expiry date | Apr 26, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A camera is provided which has a vibration detection unit that detects vibration, a photographic focal length detection unit which detects the focal length of the photographic optical system, and a distance-measurement unit that measures the distance to the object being photographed. The vibration compensation device employs drive motors as a vibration compensation unit. The drive motors have a start up time which is at least as fast as the acceleration of a vibration having roughly a sine wave shape with a frequency of 10 Hz and a maximum velocity of 7.5 mm/sec. Such a motor is able to reach the maximum velocity of the vibration in under 25 ms. Additionally, a correct compensating coefficient calculation unit is provided which, from the output of the photographic focal length detection unit and the output of the distance-measurement unit, calculates a correct compensation coefficient for determining how much to change the optical axis of the photographic optical system relative to the output of the vibration detection unit. The vibration compensation device compensates for vibrations by driving the motor to change the optical axis of the photographic optical system of the camera i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.