Interchangeable lens apparatus, image capturing apparatus and focusing program

An image capture and lens technology, applied in focusing devices, image communication, installation, etc., can solve problems such as reducing focus accuracy

Active Publication Date: 2016-03-16
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applying focus sensitivity that relies on zero image height when the focus detection position is at a position where the image height is not zero reduces focus accuracy

Method used

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  • Interchangeable lens apparatus, image capturing apparatus and focusing program
  • Interchangeable lens apparatus, image capturing apparatus and focusing program
  • Interchangeable lens apparatus, image capturing apparatus and focusing program

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Figure 4The configuration of a lens-interchangeable image capturing system as a first embodiment (Embodiment 1) of the present invention is shown. The image capturing system is composed of an interchangeable lens device (hereinafter, simply referred to as "interchangeable lens") 100 corresponding to the wide-angle lens of the numerical example described above, and a camera body (image capturing lens) detachably attached to the interchangeable lens 100. device) 200 constitute.

[0068] The interchangeable lens 100 includes an image capturing optical system, a variable magnification lens position detector 107 , an aperture stop driver 108 , a focus lens driver 109 , a lens microcomputer 110 and a memory 120 .

[0069] The image capturing optical system is composed of a first lens 101 , a variable magnification lens 102 as a second lens, an aperture stop 103 , an ND filter 104 , a focusing lens 105 as a third lens, and a fourth lens 106 in order from the object side.

...

Embodiment 2

[0125] refer to Figure 7 A flowchart of , describing AF processing by method 3 executed by the camera microcomputer 209 and the lens microcomputer 110 . The camera microcomputer 209 and the lens microcomputer 110 execute this AF processing according to computer programs installed therein. exist Figure 7 In, C represents processing executed by the camera microcomputer 209 , and L represents processing executed by the lens microcomputer 110 . In this embodiment, the lens microcomputer 110 functions as a sensitivity acquirer and a sensitivity transmitter, and the camera microcomputer 209 functions as a driving amount calculator.

[0126] Steps 1-4 and Image 6 The same as in the flowchart. When it is determined in Step 4 that the first interchangeable lens 100 having mark information is attached to the camera body 200, the camera microcomputer 209 transmits the selected image height (defocus detection image) to the lens microcomputer 110 in Step 21. high).

[0127] In ste...

Embodiment 3

[0132] Embodiments 1 and 2 describe that the camera microcomputer 209 calculates the focus drive amount by using the defocus amount and the focus sensitivity and sends a focus drive command including the focus drive amount to the lens microcomputer 110 . However, the lens microcomputer 110 may instead calculate the focus drive amount by using the defocus amount received from the camera microcomputer 209 and the focus sensitivity (focus sensitivity table or focus sensitivity function) stored therein.

[0133] refer to Figure 8 is a flowchart describing AF processing in the third embodiment (Embodiment 3) of the present invention executed by the camera microcomputer 209 and the lens microcomputer 110. The camera microcomputer 209 and the lens microcomputer 110 execute this AF processing according to computer programs installed therein. exist Figure 8 In, C represents processing executed by the camera microcomputer 209 , and L represents processing executed by the lens microc...

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PUM

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Abstract

The interchangeable lens apparatus (100) provided with an image capturing optical system and being detachably attachable to an image capturing apparatus (200), the image capturing apparatus being configured to detect a defocus amount of the image capturing optical system by using a signal acquired by photoelectric conversion of an optical image formed by the image capturing optical system. The interchangeable lens apparatus includes a focus lens (105) included in the image capturing optical system, and a memory (220) to store information on a focus sensitivity indicating a relation between a unit movement amount of the focus lens and a displacement amount of the optical image. The information on the focus sensitivity is information for enabling acquiring the focus sensitivity different depending on an image height.

Description

technical field [0001] The present invention relates to an interchangeable lens arrangement and an image capture arrangement for a lens interchangeable image capture system. Background technique [0002] In the interchangeable lens image capture system, in order to ensure the compatibility of the interchangeable lens device (hereinafter, referred to as "interchangeable lens") and the image capturing device (hereinafter, referred to as "camera body"), the interchangeable The lens stores information about its image capturing optics and sends this information to the camera body. The information sent from the interchangeable lens to the camera body includes calculating the drive of the focus lens included in the image capture optical system based on the defocus amount of the image capture optical system detected in the camera body by a focus detection function such as a phase difference detection method amount of focus sensitivity required. Focus sensitivity indicates the rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232
CPCG02B7/282G02B7/34G03B13/36G03B17/14H04N23/663H04N23/672H04N23/673
Inventor 杉田茂宣小坂雄一中道贵仁
Owner CANON KK
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