WO2026009752A1 - Dispositif de lentille et appareil d'imagerie comprenant celui-ci - Google Patents

Dispositif de lentille et appareil d'imagerie comprenant celui-ci

Info

Publication number
WO2026009752A1
WO2026009752A1 PCT/JP2025/022554 JP2025022554W WO2026009752A1 WO 2026009752 A1 WO2026009752 A1 WO 2026009752A1 JP 2025022554 W JP2025022554 W JP 2025022554W WO 2026009752 A1 WO2026009752 A1 WO 2026009752A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
group
focal length
lens device
lens group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2025/022554
Other languages
English (en)
Japanese (ja)
Inventor
孝哲 田中
誠 中原
健太 小岩井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Publication of WO2026009752A1 publication Critical patent/WO2026009752A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses

Definitions

  • the disclosures in this specification relate to a lens device and an imaging device having the same, and are suitable for imaging devices using solid-state imaging elements such as digital still cameras, video cameras, broadcast cameras, surveillance cameras, and vehicle-mounted cameras, as well as imaging devices such as cameras using silver halide photographic film.
  • Lens devices used in imaging devices are required to have good optical characteristics while providing a wide angle of view.
  • a known wide-angle lens device is a negative-lead lens device, as disclosed in Patent Document 1, in which a lens group with negative refractive power is positioned closest to the object.
  • the performance of the lens device can be improved by providing it with drip-proof and dust-proof capabilities to prevent the intrusion of foreign matter such as water droplets, dust, and sand.
  • the cover members required for drip-proofing and dust-proofing must be provided in appropriate positions on the lens device.
  • One aspect of the present invention is a lens device that includes, arranged in order from the object side to the image side, a first lens group having negative refractive power and a rear group including one or more lens groups.
  • the lens G1 in the first lens group that is located closest to the object remains stationary relative to the image plane, while the spacing between adjacent lens groups changes during zooming.
  • the lens device satisfies the condition ⁇ w > 85.
  • the lens device includes a first lens barrel, a light-shielding member located closer to the object than the first lens barrel, and a cylindrical member located on the outer diameter side of the light-shielding member, and is characterized in that a cover member is provided between at least either the light-shielding member and the cylindrical member or the first lens barrel and the cylindrical member.
  • An imaging device including the lens device also constitutes another aspect of the present invention.
  • FIG. 1 is a cross-sectional view of a lens device according to a first embodiment of the present invention
  • Aberration diagram of the lens device of Example 1 Aberration diagram of the lens device of Example 1
  • Aberration diagram of the lens device of Example 1 10 is a cross-sectional view of a lens device according to a second embodiment of the present invention
  • Aberration diagram of the lens device of Example 2 Aberration diagram of the lens device of Example 2
  • Aberration diagram of the lens device of Example 2 10 is a cross-sectional view of a lens device according to a third embodiment of the present invention
  • Aberration diagram of the lens device of Example 3 Aberration diagram of the lens device of Example 3
  • Aberration diagram of the lens device of Example 3 10 is a cross-sectional view of a lens device according to a fourth embodiment of the present invention
  • Aberration diagram of the lens device of Example 4 Aberration diagram of the lens device of Example 4
  • Aberration diagram of the lens device of Example 4 10 is a cross-sectional view of a lens device according to a fifth embodiment
  • FIG. 10 is an enlarged cross-sectional view showing a drip-proof structure arranged in the optical axis direction on the inner diameter side around the lens G1.
  • FIG. 10 is an enlarged cross-sectional view showing a drip-proof structure arranged in the direction of the optical axis on the exterior side around the lens G1.
  • FIG. 10 is an enlarged cross-sectional view showing a drip-proof structure arranged in the optical axis direction on the inner diameter side around the lens G1.
  • FIG. 10 is an enlarged cross-sectional view showing a drip-proof structure arranged in the direction of the optical axis on the exterior side around the lens G1.
  • Conditional formula (4) defines the ratio between the focal length fG1 of the lens G1 closest to the object in the first lens group L1 and the focal length fG2 of the lens G2 arranged adjacent to the lens G1 on the image side. Two negative lenses are arranged in order from the object side to achieve a wider angle. If the focal length fG1 of lens G1 becomes too short, falling below the lower limit of conditional formula (4), it becomes difficult to correct field curvature and distortion. If the focal length fG1 of lens G1 becomes too long, exceeding the upper limit of conditional formula (4), the lens G1 and first lens group L1 become large, making it difficult to reduce the size of the lens device L0.
  • the numerical ranges of the conditional expressions (1) to (12) be the numerical ranges of the following conditional expressions (1a) to (12a). -2.6 ⁇ fL1/fw ⁇ -1.9 (1a) -3.6 ⁇
  • FIG. 9 shows a cross-sectional view of a lens device L0 according to a fifth embodiment.
  • the lens device L0 of the fifth embodiment comprises a first lens unit L1 and a rear lens unit LR.
  • the rear lens unit LR comprises a second lens unit L2 with negative refractive power, a third lens unit L3 with positive refractive power, a fourth lens unit L4 with positive refractive power, a fifth lens unit L5 with positive refractive power, and a sixth lens unit L6 with negative refractive power.
  • the first lens unit L1 remains stationary relative to the image plane, while the second lens unit L2, the third lens unit L3, the fourth lens unit L4, the fifth lens unit L5, and the sixth lens unit L6 move toward the object side.
  • the fifth lens unit L5 is the focus unit LF.
  • the first lens group L1 has two or more negative lenses, in order from the object side. Furthermore, it is preferable that the lens G1 closest to the object side has a meniscus shape convex toward the object side, and that the vertex of the object-side surface of the lens G1 closest to the object side is located closer to the object side than the first lens barrel. This makes it easy to achieve a wide angle of view for the lens device L0.
  • the lens device L0 of each embodiment it is preferable to make the object-side lens surface and image-side lens surface of the lens G1 arranged closest to the object a meniscus shape with a convex surface facing the object, as this facilitates the manufacture of the lens device L0 while still satisfying the required optical performance. Furthermore, it is preferable to configure the first lens group L1 with two negative lenses and to make all of the lenses included in the first lens group L1 spherical lenses, as this further facilitates the manufacture of the lens device L0.
  • the focus group LF it is preferable to configure the focus group LF with two or fewer lenses and position it closer to the image side than the aperture stop SP, as this makes it easier to reduce the size of the focus group LF and increase the focusing speed.
  • the lens device L0 of each embodiment it is more preferable to configure the rear group LR with three or more lens groups, as this makes it possible to achieve a sufficient zoom ratio.
  • the lens device L0 in each embodiment may be provided with distortion correction data for correcting distortion. This allows the lens device L0 to correct distortion that occurs in the lens optical system.
  • any of the cover member placement methods shown in Figures 16 to 21 may be adopted, or the cover members may be placed using a combination of multiple placement methods.
  • Numerical Examples 1 to 6 corresponding to Examples 1 to 6, respectively, are shown below.
  • r represents the radius of curvature of each optical surface
  • d (mm) represents the distance on the optical axis between the mth surface and the (m+1)th surface.
  • m is the surface number counted from the light incident side.
  • nd represents the refractive index of the material of each optical element with respect to the d-line
  • vd represents the Abbe number of the material of the optical element.
  • d focal length (mm), F-number, and half angle of view (°) are all values when the lens device L0 of each example is focused on an object at infinity.
  • back focus is the distance on the optical axis from the lens surface of lens device L0 closest to the image to the paraxial image plane, expressed as an air-equivalent length.
  • the total lens length is the distance on the optical axis from the frontmost lens surface (the lens surface closest to the object) of lens device L0 to the final surface, plus the back focus.
  • the lens group in each numerical example is not limited to cases where it is composed of multiple lenses, but also includes cases where it is composed of a single lens.
  • optical surface is aspherical
  • a * symbol is added to the right of the surface number.
  • FIG. 13 is a schematic diagram of the image pickup apparatus 10 of this embodiment.
  • the image pickup apparatus 10 includes a camera body 13, a lens device 11 similar to any of the lens devices 11 of the first to sixth embodiments, and a light receiving element 12 that photoelectrically converts an optical image formed by the lens device 11.
  • the imaging device 10 of this embodiment has a lens device 11 that is small and has excellent optical characteristics, making it possible to obtain high-quality images.
  • the light receiving element 12 can be an imaging element such as a CCD or CMOS sensor.
  • various aberrations such as distortion and chromatic aberration of the image captured by the light receiving element 12 can be electrically corrected to improve the image quality of the output image.
  • the lens device L0 of each of the above-described embodiments can be applied not only to the digital still camera shown in FIG. 13, but also to various optical devices such as silver halide film cameras, video cameras, and telescopes.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)

Abstract

Est divulgué un dispositif de lentille comprenant, disposés dans l'ordre du côté objet au côté image, un premier groupe de lentilles ayant une réfringence négative et un groupe arrière comprenant un ou plusieurs groupes de lentilles, dans lequel : pendant le zoom, une lentille G1 disposée la plus proche du côté objet parmi des lentilles comprises dans le premier groupe de lentilles est immobile par rapport à un plan d'image ; pendant le zoom, la distance entre des groupes de lentilles adjacents change ; et lorsque le demi-angle de vision pendant la mise au point à l'infini à une extrémité grand angle est désigné par ωw (°), une expression conditionnelle de ωw > 85 est satisfaite. Le dispositif de lentille est caractérisé en ce qu'il comprend un premier barillet de lentille, un élément de blocage de lumière disposé plus près du côté objet que le premier barillet de lentille, et un élément cylindrique situé sur le côté de diamètre externe de l'élément de blocage de lumière, et en étant pourvu d'un élément de couvercle entre l'élément de blocage de lumière et l'élément cylindrique et/ou entre le premier barillet de lentille et l'élément cylindrique.
PCT/JP2025/022554 2024-07-05 2025-06-23 Dispositif de lentille et appareil d'imagerie comprenant celui-ci Pending WO2026009752A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024108628A JP2026008164A (ja) 2024-07-05 2024-07-05 レンズ装置およびそれを有する撮像装置
JP2024-108628 2024-07-05

Publications (1)

Publication Number Publication Date
WO2026009752A1 true WO2026009752A1 (fr) 2026-01-08

Family

ID=98318458

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2025/022554 Pending WO2026009752A1 (fr) 2024-07-05 2025-06-23 Dispositif de lentille et appareil d'imagerie comprenant celui-ci

Country Status (2)

Country Link
JP (1) JP2026008164A (fr)
WO (1) WO2026009752A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009069298A (ja) * 2007-09-11 2009-04-02 Ricoh Co Ltd ズームレンズおよびカメラ装置および携帯情報端末装置
JP2012027093A (ja) * 2010-07-20 2012-02-09 Canon Inc レンズ鏡筒および光学機器
WO2017145208A1 (fr) * 2016-02-24 2017-08-31 パナソニックＩｐマネジメント株式会社 Système d'objectif zoom, dispositif de capture d'image comportant un système d'objectif zoom, et véhicule comportant un dispositif de capture d'image
JP2018063286A (ja) * 2016-10-11 2018-04-19 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
JP2023044106A (ja) * 2021-09-17 2023-03-30 ソニーグループ株式会社 ズームレンズ、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
JP2009069298A (ja) * 2007-09-11 2009-04-02 Ricoh Co Ltd ズームレンズおよびカメラ装置および携帯情報端末装置
JP2012027093A (ja) * 2010-07-20 2012-02-09 Canon Inc レンズ鏡筒および光学機器
WO2017145208A1 (fr) * 2016-02-24 2017-08-31 パナソニックＩｐマネジメント株式会社 Système d'objectif zoom, dispositif de capture d'image comportant un système d'objectif zoom, et véhicule comportant un dispositif de capture d'image
JP2018063286A (ja) * 2016-10-11 2018-04-19 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
JP2023044106A (ja) * 2021-09-17 2023-03-30 ソニーグループ株式会社 ズームレンズ、および撮像装置

Also Published As

Publication number Publication date
JP2026008164A (ja) 2026-01-19

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