Title:
LENS BARREL
Document Type and Number:
Japanese Patent JP2017161663
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To solve the problem, in which in a lens barrel device having a barrel mechanism where each lens group sinks in a state where the lens group comes off an optical axis, when an initial operation is ended in a state where the optical axis deviates upon movement from a sink position to a wide position, incidence light with respect to an image pick-up element is oblique, and thus, deterioration of a photoelectric conversion rate of the image pick-up element results in appearance in an image as luminance unevenness, and when operative power of each lens group is composed of a mechanical element, there is no way of grasping a current position of each lens group to thereby unable detection of an optical axis deviation, and if a sensor for position detection is separately arranged, a cost becomes expensive.SOLUTION: With respect to an acquired image, a deviation value between a luminance value of an identification part where luminance unevenness arising from an optical axis deviation is expected, and a luminance value of a center part where an influence on an image is minor even if the optical axis deviation occurs is acquired a plurality of times, and then, presence or absence of a change in acquisition result makes a judgement about a state of the optical axis deviation. When the optical axis deviation is determined, a return operation is performed.SELECTED DRAWING: Figure 1
Inventors:
ONO YASUHIRO
Application Number:
JP2016045063A
Publication Date:
September 14, 2017
Filing Date:
March 09, 2016
Export Citation:
Assignee:
CANON KK
International Classes:
G03B17/04; G02B7/08; H04N5/225; H04N5/232
Attorney, Agent or Firm:
Yukio Takanashi
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