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公开(公告)号：US20240012221A1
公开(公告)日：2024-01-11
申请号：US18329794
申请日：2023-06-06
Applicant: CANON KABUSHIKI KAISHA
Inventor： Akira MIZUMA
CPC classification number: G02B9/08 , G02B15/144511 , G02B15/145523 , G02B15/1461 , G02B15/145121 , G02B15/15 , G02B13/18
Abstract: In an optical system, a height from an optical axis of a paraxial marginal ray that passes through a lens surface closest to an object is smaller than a maximum height from the optical axis of the paraxial marginal ray that passes through a lens surface on an image side of an intersection between the optical axis and a paraxial chief ray. The optical system includes an optical element disposed on an object side or the image side of the intersection. The optical element has positive refractive power in a case where the optical element is disposed on the object side of the intersection, and has negative refractive power in a case where the optical element is disposed placed on the image side of the intersection. A predetermined condition is satisfied.
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公开(公告)号：US20230213741A1
公开(公告)日：2023-07-06
申请号：US18060984
申请日：2022-12-02
Inventor： Chun-Yang Yao , Hsi-Ling Chang
CPC classification number: G02B15/1431 , G02B13/0045 , G02B15/15
Abstract: A lens assembly includes a first lens group, a second lens group, and a third lens group, all of which are arranged in order from a first side to a second side along an optical axis. The first lens group is with positive refractive power. The second lens group is with positive refractive power. The third lens group is with positive refractive power. The first lens group is fixed, the second lens group can move along the optical axis, and the third lens group can move along the optical axis, so that the lens assembly is zoomed from a wide-angle end to a telephoto end to change an effective focal length.
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公开(公告)号：US20230194852A1
公开(公告)日：2023-06-22
申请号：US18169717
申请日：2023-02-15
Applicant: FUJIFILM Corporation
Inventor： Hiroki SAITO
CPC classification number: G02B25/001 , G02B15/15 , G02B13/18
Abstract: An observation optical system includes a display element and an eyepiece lens disposed on an eyepoint side of the display element. The eyepiece lens includes a first lens having positive optical power, a second lens having negative optical power, and a third lens consecutively in order from closest to a display element side to the eyepoint side. In a case where a half value of a longest diameter of a display region in the display element is denoted by H, and a focal length of the eyepiece lens in a state where diopter is −1 diopter is denoted by f, the observation optical system satisfies a conditional expression represented by 0.35
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公开(公告)号：US20220163778A1
公开(公告)日：2022-05-26
申请号：US17453403
申请日：2021-11-03
Applicant: FUJIFILM Corporation
Inventor： Yuya HIRAKAWA
Abstract: The imaging lens includes, in order from a position closest to an object side to an image side: a front lens group that has a positive refractive power and is immovable during focusing; a stop that is disposed subsequent to the front lens group; a first focus lens group that has a positive refractive power; a second focus lens group that has a negative refractive power; and a final lens group that has a positive refractive power, is disposed closest to the image side, and is immovable during focusing. During focusing from an infinite distance object to a short range object, the first focus lens group and the second focus lens group move to increase a mutual distance therebetween.
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公开(公告)号：US11030430B2
公开(公告)日：2021-06-08
申请号：US15403752
申请日：2017-01-11
Applicant: Cognex Corporation
Inventor： Laurens Nunnink
IPC: G06K7/10 , G02B3/14 , G06K7/14 , G02B23/00 , G02B7/10 , G02B15/15 , G02B26/00 , G02B7/02 , H04N5/232 , H04N5/225 , G02B15/14 , G02B13/24 , G02B5/00 , G02B27/00 , G02B27/09
Abstract: This invention provides a lens assembly for a vision system, allowing for a constant magnification at various focal distances. The lens assembly resides movably/adjustably along the optical axis relative to the sensor. In an embodiment, the lens assembly includes a fixed rear lens and a front lens that is moved mechanically to focus the object image on the image sensor. The lens assembly can alternatively include a liquid lens that is controlled to adjust magnification with respect to a fixed front lens so as to maintain a constant system magnification. The liquid lens resides between the (fixed) front lens assembly and the image sensor and can be controlled to focus the image onto the image sensor.
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6.发明授权
公开(公告)号：US10967794B2
公开(公告)日：2021-04-06
申请号：US16043075
申请日：2018-07-23
Inventor： Tsutomu Iwashita
IPC: G02B15/14 , B60R1/02 , G02B15/15 , G02B15/177 , G02B13/18 , G02B13/00 , G02B15/22 , G02B5/00 , G02B13/06 , G02B13/04
Abstract: A zoom lens system includes, in order from the object side to the image side, a first lens group having negative power and a second lens group having positive power. The first lens group includes at least two negative lenses. When zooming, one of the first lens group and the second lens group is fixed relative to the imaging surface, and the other moves along an optical axis to change an angle of view.
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7.发明申请
公开(公告)号：US20200292798A1
公开(公告)日：2020-09-17
申请号：US16886757
申请日：2020-05-28
Applicant: Nikon Corporation
Inventor： Hiroshi Yamamoto , Satoru Shibata
IPC: G02B15/15 , G02B27/64 , G02B15/173 , G02B13/00
Abstract: Provided is a variable magnification optical system comprising, in order from an object side along an optical axis, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, and a fourth lens group G4; upon zooming from a wide angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2 being varied, a distance between the second lens group G2 and the third lens group G3 being varied, and a distance between the third lens group and the fourth lens group being varied; the third lens group G3 comprising, in order from the object side along the optical axis, a 3a-th lens group G3a having positive refractive power, an aperture S, and a 3b-th lens group G3b having positive refractive power; a lens group having negative refractive power within the 3b-th lens group G3b being used as a vibration reduction lens group and moved so as to include a component in a direction orthogonal to the optical axis, whereby image plane correction is performed when image blurring occurs; and predetermined conditions being satisfied. Whereby, a small-size and high-performance variable magnification optical system, capable of realizing a small variation in aberration and attaining a sufficient brightness even in the telephoto state, an imaging apparatus, and a method for manufacturing the variable magnification optical system are provided.
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公开(公告)号：US10746977B2
公开(公告)日：2020-08-18
申请号：US16014070
申请日：2018-06-21
Applicant: CANON KABUSHIKI KAISHA
Inventor： Hiroto Yasui
IPC: G02B15/15 , G02B15/167 , G02B13/00 , G02B13/02 , G02B27/42
Abstract: Provided is an optical system including, in order from an object side to an image side, a front lens unit, an aperture stop, and a rear lens unit. The front lens unit consists of a positive lens and a diffractive optical element, which are arranged in order from the object side to the image side. The diffractive optical element consists of a plurality of lenses that are cemented to each other, and at least one of cemented surfaces of the plurality of lenses is a diffractive surface. An interval on an optical axis between the positive lens and the diffractive optical element is the largest among intervals on the optical axis between two lenses that are adjacent in the optical system.
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公开(公告)号：US10670844B2
公开(公告)日：2020-06-02
申请号：US15881638
申请日：2018-01-26
Applicant: Navitar, Inc.
Inventor： Chad Byler
IPC: G02B15/14 , G02B21/02 , G02B21/36 , G02B13/24 , G02B25/00 , G02B27/00 , G02B15/16 , G02B15/17 , G02B23/12 , G02B15/15 , G02B15/22 , G02B27/10
Abstract: A finite conjugate lens assembly including an afocal zooming component that has five optical groups that are configured to provide a ratio of highest to lowest magnification between 5.5:1 and 16:1. A lens attachment module and rear adapter module may be disposed, respectively, on an object side and an image side of the optical assembly. The lens assembly may exhibit an approximate etendue between 0.95 and 4.65 mm2sr, and may be configured in accordance with between 6.6MP and 32MP image sensors.
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公开(公告)号：US10670843B2
公开(公告)日：2020-06-02
申请号：US15881594
申请日：2018-01-26
Applicant: Navitar, Inc.
Inventor： Chad Byler
IPC: G02B13/24 , G02B15/15 , G02B15/22 , G02B21/02 , G02B25/00 , G02B21/36 , G02B15/14 , G02B27/00 , G02B15/16 , G02B15/17 , G02B23/12 , G02B27/10
Abstract: A finite conjugate lens assembly with modular interchangeable components includes a zooming component that includes three independently movable lens groups that are disposed within the lens assembly between a pair of static lens groups. The lens assembly exhibits an etendue of between 0.95 and 4.65 mm2sr.
