WO2013031564A1 - Système optique et dispositif d'imagerie - Google Patents

Système optique et dispositif d'imagerie Download PDF

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Publication number
WO2013031564A1
WO2013031564A1 PCT/JP2012/070965 JP2012070965W WO2013031564A1 WO 2013031564 A1 WO2013031564 A1 WO 2013031564A1 JP 2012070965 W JP2012070965 W JP 2012070965W WO 2013031564 A1 WO2013031564 A1 WO 2013031564A1
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WO
WIPO (PCT)
Prior art keywords
axis
defocus mtf
optical system
mtf
defocus
Prior art date
Application number
PCT/JP2012/070965
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English (en)
Japanese (ja)
Inventor
慶延 岸根
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富士フイルム株式会社
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Filing date
Publication date
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Publication of WO2013031564A1 publication Critical patent/WO2013031564A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras

Definitions

  • the optical system of the present invention forms an image on an image sensor, has a maximum principal ray angle of 35 degrees or more, and has radial and tangential directions on the axis.
  • the focus MTF peak position and the off-axis tangential defocus MTF peak position are within ⁇ 5% of the focal length from the best focus position, and the off-axis defocus MTF peak position is off-axis.
  • the peak position of the defocus MTF in the tangential direction is shifted in the plus or minus direction.
  • the off-axis radial defocus MTF peak position shift amount is Dv
  • the off-axis radial defocus MTF value is 0.2 or more
  • the defocus range is Wt
  • the off-axis radial defocus MTF is defocused.
  • the shift amount Dv satisfies Dv ⁇ 0.05 Wt ⁇ (P0 / P1).
  • An imaging apparatus of the present invention includes an optical system capable of focus adjustment, and an image sensor that photoelectrically converts an image formed by the optical system, the maximum principal ray angle of the optical system being 35 degrees or more, and an axis
  • the peak positions of the upper radial and tangential defocus MTFs and the peak position of the off-axis tangential defocus MTF are within ⁇ 5% of the best focus position.
  • the peak position of the focus MTF is shifted in the plus or minus direction with respect to the peak position of the defocus MTF in the tangential direction.
  • the image sensor 12 is a CCD or CMOS device, and has an imaging surface IP in which a plurality of pixels are two-dimensionally arranged.
  • the image sensor 12 photoelectrically converts an image formed on the imaging surface IP and outputs image data to the AF control unit 13 and the image processing unit 14.
  • the size of the image sensor 12 is, for example, 1 ⁇ 4 inch and the pixel pitch is 1.4 ⁇ m (5M pixels, 2600 ⁇ 1960 pixels, 3.640 mm ⁇ 2.744 mm).
  • the Nyquist frequency Ny determined from the pixel pitch of the image sensor 12 is about 360 lines / mm, and the image sensor 12 can resolve an image having a spatial frequency of about 360 lines / mm or less. Since the Nyquist frequency Ny, which is particularly well resolved, is about 90 lines / mm (hereinafter referred to as Ny / 4), the MTF for defocus described later is evaluated based on the spatial frequency of Ny / 4. To do.
  • the AF control unit 13 automatically determines an appropriate focal length based on input image data and the like, and inputs the result to the optical system 11.
  • the optical system 11 performs focus adjustment by moving the lens L1 (see FIG. 2) and the like in the optical axis direction based on a signal input from the AF control unit 13. Also, the determination of an appropriate focal length performed by the AF control unit 13 is performed within a predetermined range according to the characteristics of the optical system 11 described later.
  • the image processing unit 14 performs various image processing such as gamma correction processing on the image data obtained by the image sensor 12. Image data subjected to image processing by the image processing unit 14 is displayed on the display unit 16 or stored in the memory 17.
  • the optical system 11 is an optical system substantially composed of one or more lenses, and includes, for example, a diaphragm (not shown), an objective lens group L0, and a correction lens L1.
  • An optical system consisting essentially of one or more lenses means, in addition to one or more lenses or lens groups, lenses having substantially no power, optical elements other than lenses, such as a diaphragm and a cover glass, lens flanges, lenses It includes a barrel, a part or all of the image sensor (image sensor 12), a mechanism part such as a camera shake correction mechanism, and the like.
  • the diaphragm of the optical system 11 is provided, for example, in the lens group L0, in front of the lens group L0, between the lens group L0 and the correction lens L1, and behind the correction lens L1 (on the imaging surface IP side).
  • the objective lens group L0 is a lens group that includes a plurality of approximately 2 to 5 lenses and has a predetermined focal length (eg, 3 mm) as a whole.
  • the correction lens L1 is a lens for correcting the MTF of the optical system 11.
  • the correction lens L1 is a lens for correcting the MTF mode with respect to the focus shift of the lens unit L0.
  • the correction lens L1 corrects the peak position of the MTF with respect to the focus shift in the T direction outside the optical axis.
  • the optical system 19 includes a diaphragm (not shown), a lens group L2, and a lens L3.
  • the lens group L2 has a longer focal length (for example, from 4 mm) than the lens group L0 of the thin optical system 11 of the present invention.
  • the lens L3 is a lens corresponding to the correction lens L1 of the thin optical system 11 of the present invention, but the lens L2 does not have an action of correcting the MTF of the optical system 19 unlike the correction lens L1.
  • the diaphragm of the conventional optical system 19 is provided, for example, in the lens group L2, in front of the lens group L2, between the lens group L2 and the lens L3, and behind the lens L3 (on the imaging surface IP side).
  • the conventional optical system 19 shows a change in MTF (hereinafter referred to as defocus MTF) with respect to focus shift (hereinafter referred to as defocus) at a spatial frequency of Ny / 4.
  • defocus MTF MTF
  • the on-axis defocus MTF is larger than the off-axis defocus MTF in the most part including the best focus position, but the on-axis defocus MTF and the off-axis defocus MTF are larger or smaller in the part where the defocus amount is large.
  • the relationship may be reversed and the off-axis defocus MTF may exceed the on-axis defocus MTF.
  • the best focus position is the peak position of the on-axis defocus MTF at a spatial frequency of Ny / 4.
  • the position of 0 ⁇ m defocus is the best focus position.
  • the image is blurred in the first place, so that the off-axis defocus MTF and the on-axis defocus MTF are reversed, the off-axis defocus MTF in the T direction and the axis in the S direction. Difficult to remember due to reversal of outside defocus MTF.
  • both the on-axis MTF and the off-axis MTF decrease as the spatial frequency increases, as in the conventional optical system 19.
  • the on-axis MTF and the off-axis MTF in the S direction are substantially the same as those of the conventional optical system 19, but the off-axis MTF in the T direction of the thin optical system 20 decreases more steeply than the conventional optical system 19. .
  • the off-axis defocus MTF in the T direction has a method of decreasing with respect to the defocus amount as compared with the on-axis defocus MTF and the off-axis defocus MTF in the S direction. It is moderate. As a result, the range in which the off-axis defocus MTF is smaller than the on-axis defocus MTF is smaller than that of the conventional optical system 19 (see FIG. 14).
  • the width of the region E1 in which the off-axis defocus MTF in the T direction is smaller than the off-axis defocus MTF in the S direction is reduced, and the off-axis defocus MTF in the T direction is larger than the off-axis defocus MTF in the S direction.
  • the width of the region E2 is expanded.
  • the region E2 in which the off-axis defocus MTF in the T direction is larger than the off-axis defocus MTF in the S direction has a larger MTF range of 0.2 or more than the conventional optical system, and the T direction.
  • the off-axis defocus MTF and the off-axis defocus MTF in the S direction are reversed, and the gap is larger than that of the conventional optical system (see FIG. 14).
  • the thin optical system 11 of the present invention mounted on the imaging device 10 has the following characteristics by the correction lens L1, so that the on-axis defocus MTF is off-axis defocused while being thin.
  • the range in which the off-axis defocus MTF in the T direction is smaller than the off-axis defocus in the S direction is larger than the MTF.
  • the thin optical system 11 of the present invention is an optical system having the same focal length of 3 mm as the thin optical system 20 shown in FIG. 3, but is off-axis defocused MTF in the T direction by the correction lens L1.
  • the optical position is shifted in the plus direction with respect to the peak position Vs of the off-axis defocus MTF in the S direction. In this way, when the peak position Vt of the off-axis defocus MTF in the T direction is shifted from the best focus position, the position of the intersection of the graph of the off-axis defocus MTF in the T direction and the off-axis defocus MTF in the S direction.
  • the AF control unit 13 of the imaging apparatus 10 does not simply perform focus adjustment so that the main subject is in the best focus, but the above-described on-axis defocus MTF is larger than the off-axis defocus MTF, and T Focus adjustment is performed so that all the subjects are within the range in which the off-axis defocus MTF in the direction is smaller than the off-axis defocus MTF in the S direction (in the range of 47 ⁇ m in FIG. 8).
  • T Focus adjustment is performed so that all the subjects are within the range in which the off-axis defocus MTF in the direction is smaller than the off-axis defocus MTF in the S direction (in the range of 47 ⁇ m in FIG. 8).
  • the defocusing range in which an image without a sense of incongruity is obtained by shifting the peak position Vt of the off-axis defocusing MTF in the T direction is illustrated in FIG.
  • the peak position Vs of the off-axis defocus MTF in the S direction is shifted without shifting the peak position Vt of the off-axis defocus MTF in the T direction.
  • the peak position Vs of the off-axis defocus MTF in the S direction may be shifted to the opposite side of the shift direction (for example, plus side) of the peak position Vt of the focus MTF.

Abstract

L'invention concerne un système optique fin qui peut éliminer l'inversion de la résolution au niveau d'une partie centrale et de parties périphériques ainsi que l'inversion de la résolution dans une direction de ligne tangente (direction S) et une direction radiale (direction T) pour obtenir des images qui ne provoquent pas d'inconfort. L'invention concerne également un dispositif d'imagerie utilisant ledit système optique. La position de pic (Vt) pour un MTF de défocalisation dans la direction T extérieur à l'axe et la position de pic (Vs) pour un MTF de défocalisation dans la direction S extérieure à l'axe diffèrent. La position de pic pour un MTF de défocalisation sur l'axe et la position de pic (Vs) pour un MTF de défocalisation dans la direction S extérieure à l'axe sont dans la meilleure position de foyer. La position de pic (Vt) pour un MTF de défocalisation dans la direction T est décalée vers le côté plus de la meilleure position de foyer. Ainsi, le MTF de défocalisation extérieur à l'axe est plus petit que le MTF de défocalisation sur l'axe, et le MTF de défocalisation extérieur à l'axe dans la direction T est plus petit que le MTF de défocalisation extérieur à l'axe dans la direction S ; la gamme de défocalisation dans laquelle des images ne provoquant pas d'inconfort peuvent être obtenues est étendue.
PCT/JP2012/070965 2011-08-26 2012-08-20 Système optique et dispositif d'imagerie WO2013031564A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011184303A JP2014219426A (ja) 2011-08-26 2011-08-26 光学系及びこれを用いる撮像装置
JP2011-184303 2011-08-26

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WO2013031564A1 true WO2013031564A1 (fr) 2013-03-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112312028A (zh) * 2020-11-20 2021-02-02 歌尔光学科技有限公司 摄像头模组调焦方法、装置及计算机可读存储介质

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009223251A (ja) * 2008-03-19 2009-10-01 Olympus Corp 撮像装置
JP2011007869A (ja) * 2009-06-23 2011-01-13 Enplas Corp 撮像レンズ
JP2011018031A (ja) * 2009-07-08 2011-01-27 Nalux Co Ltd 結像光学系
WO2011096193A1 (fr) * 2010-02-08 2011-08-11 パナソニック株式会社 Lentille de saisie d'image, dispositif de saisie d'image l'utilisant et appareil portable équipé du dispositif de saisie d'image
JP2011154336A (ja) * 2009-12-28 2011-08-11 Sony Corp 光学ユニットおよび撮像装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009223251A (ja) * 2008-03-19 2009-10-01 Olympus Corp 撮像装置
JP2011007869A (ja) * 2009-06-23 2011-01-13 Enplas Corp 撮像レンズ
JP2011018031A (ja) * 2009-07-08 2011-01-27 Nalux Co Ltd 結像光学系
JP2011154336A (ja) * 2009-12-28 2011-08-11 Sony Corp 光学ユニットおよび撮像装置
WO2011096193A1 (fr) * 2010-02-08 2011-08-11 パナソニック株式会社 Lentille de saisie d'image, dispositif de saisie d'image l'utilisant et appareil portable équipé du dispositif de saisie d'image

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112312028A (zh) * 2020-11-20 2021-02-02 歌尔光学科技有限公司 摄像头模组调焦方法、装置及计算机可读存储介质

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