Focus adjustment apparatus, imaging apparatus and lens barrel
US9635239B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2014 |
| Grant date | Apr 25, 2017 |
| Priority date | — |
| Expiry date | May 14, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2206/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A focus adjustment control apparatus is provided which includes: a focus detection unit that calculates an evaluation value with regard to contrast of an image via an optical system to detect a focus adjustment state of the optical system; an acquisition unit that acquires from a lens barrel at least one of a maximum value and a minimum value of an image plane movement coefficient that represents correspondence relationship between a movement amount of a focus adjustment lens included in the optical system and a movement amount of an image plane; and a control unit that uses at least one of the maximum value and the minimum value of the image plane movement coefficient to determine a drive speed for the focus adjustment lens when the focus detection unit detects the focus adjustment state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.