Title:
FOCUS ADJUSTMENT DEVICE, CAMERA SYSTEM AND FOCUS ADJUSTMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2013/118559
Kind Code:
A1
Abstract:
The purpose of the invention is to improve the ability to track a moving body during continuous shooting and thereby allow for high-speed and accurate focus adjustment. A control unit of a camera body performs initial position driving for moving a focus lens with the driving amount and the driving direction for the initial position driving set to Li, on the basis of the magnitude of the speed of an object (the slope of an object movement profile (H)) detected by an object speed detection unit, so as to satisfy the relationship Lh < (Ls - Lps + Li), where Lh is the amount of image plane movement by the object, Ls is the scan driving range, Lps is the scan driving range required for detecting a peak, and Li is the initial position driving amount. Thereby, the object movement profile (H) and the scan driving amount profile (S) of a focus lens intersect in an interval (k4) where contrast autofocus is implemented. Thereafter, the control unit performs a scan driving operation in the interval (k4) and reliably detects a focus point regardless of the magnitude of the image plane moving speed of an object (the slope of the object movement profile (H)).
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Inventors:
KIKUCHI TETSUO (JP)
KINDAICHI TAKESHI (JP)
KINDAICHI TAKESHI (JP)
Application Number:
PCT/JP2013/050900
Publication Date:
August 15, 2013
Filing Date:
January 18, 2013
Export Citation:
Assignee:
OLYMPUS IMAGING CORP (JP)
International Classes:
G02B7/28; G02B7/36; G03B13/36; G03B15/00; H04N5/232
Foreign References:
| JP2007206433A | 2007-08-16 | |||
| JP2008015274A | 2008-01-24 | |||
| JP2010008695A | 2010-01-14 |
Attorney, Agent or Firm:
OSUGA, Yoshiyuki (JP)
Yoshiyuki Osuge (JP)
Yoshiyuki Osuge (JP)
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Claims: