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Focus controller

A focus control and control part technology, applied in focusing devices, installations, instruments, etc., can solve the problems of longer time, larger driving amount of the focus lens, and affecting the display of browsing images.

Active Publication Date: 2015-04-01
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when it takes time until the determination of the focus direction is determined, the excess drive amount of the focus lens also becomes large.
[0010] When the excess drive amount of the focus lens increases, the time it takes until the AF process is completed becomes longer
In particular, when the review image display is performed during AF processing, the excessively driven portion of the focus lens also affects the review image display.

Method used

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Embodiment Construction

[0034] Embodiments of the present invention will be described below with reference to the drawings.

[0035] figure 1 It is a configuration diagram of an imaging device including a focus control device according to an embodiment of the present invention. figure 1 The illustrated imaging device has an interchangeable lens 100 and a camera body 200 . In this imaging device, the interchangeable lens 100 is freely detachable from the camera body 200 via a not-shown lens mount provided on the camera body 200 .

[0036] The interchangeable lens 100 has an imaging lens 101 , a motor driver 102 , a lens control unit 103 , and a storage unit 104 . Here, the actual interchangeable lens 100 also has an aperture control mechanism, a zoom mechanism, etc., but in figure 1 The illustration is omitted.

[0037] The imaging lens 101 is an optical system including a focus lens, and generates an optical image of a subject (not shown) on the imaging element 201 of the camera body 200 . Th...

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Abstract

A focus controller includes an evaluation value generating unit and a control unit. An evaluation value generating unit obtains a first evaluation value based on a first signal output from a pixel part of an imaging unit by scanning the pixel part in a first direction and obtains a second evaluation value based on a second signal output from the pixel part by scanning the pixel part in a second direction different from the first direction. When a first movement direction of a focus lens based on the first evaluation value and a second movement direction of a focus lens based on the second evaluation value are in the same direction, the control unit performs an auto focus operation in order to move the focus lens in the movement direction determined as the same direction.

Description

technical field [0001] The present invention relates to a focus control device for an imaging device. Background technique [0002] As one of automatic focus (hereinafter, referred to as "AF") control methods, a contrast method is known. The contrast method is a method in which the contrast of a subject is evaluated while moving the focus lens along its optical axis, and the focus lens is moved to the focus position with the lens position at which the contrast of the subject becomes maximum. . In general, the contrast method evaluates the contrast of a subject by evaluating an evaluation value (AF evaluation value) calculated from a signal obtained by scanning a pixel unit provided in an imaging unit. [0003] As a technique related to such a contrast method, there are, for example, those proposed in JP-A-2007-57763 and JP-A-2009-21929. [0004] Japanese Patent Application Laid-Open No. 2007-57763 proposes a technique using an evaluation value calculated from a signal obt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/28G02B7/36G03B13/36H04N5/232
CPCG02B7/28H04N5/23261G03B13/36H04N5/23209H04N5/23212G02B7/38G02B7/36H04N5/232H04N23/663H04N23/673H04N23/6815H04N23/63
Inventor 菊地哲央
Owner OLYMPUS CORP