公开(公告)号：US10591842B2

公开(公告)日：2020-03-17

申请号：US16129256

申请日：2018-09-12

Applicant: Oki Data Corporation

Inventor： Akihiro Yamamura

IPC: G03G15/04 ,  G02B9/04 ,  G02B27/09 ,  G02B3/02 ,  G02B3/00

Abstract: Provided are a lens array, a lens unit, an exposure device, an LED head, and an image forming apparatus. The lens array includes a plurality of lenses arranged so as to form an array. Each of the plurality of lenses is configured so that a contour focal length which is a focal length of a ray incident on a first position separate from an optical axis is longer than a paraxial focal length which is a focal length of a ray incident on a second position in the vicinity of the optical axis.

公开(公告)号：US11194079B2

公开(公告)日：2021-12-07

申请号：US16279373

申请日：2019-02-19

Applicant: Oki Data Corporation

Inventor： Akihiro Yamamura

IPC: G02B3/00 ,  G02B7/02 ,  G02B5/00 ,  H04N1/028 ,  G03G15/04

Abstract: A lens unit includes a first lens array including first lenses arranged in at least two lines; a second lens array including second lenses arranged in an arrangement relationship corresponding to the first lens array, the second lenses respectively facing the first lenses, the second lens array being arranged to face the first lens array so that each pair of the first and second lenses has a common optical axis; and a first light blocking member arranged between the first lens array and the second lens array and having first openings each being arranged to face the pair of the first and second lenses in a direction of the optical axis. An interval PXL from an array center position between two adjacent lines to the optical axis and an interval PXS from the array center position to an opening center of the first opening satisfy PXL

公开(公告)号：US10356270B2

公开(公告)日：2019-07-16

申请号：US15624748

申请日：2017-06-16

Applicant: Oki Data Corporation

Inventor： Akihiro Yamamura

IPC: G02B3/00 ,  H04N1/29 ,  H04N1/024 ,  H04N1/028 ,  G03G15/043

Abstract: A lens unit according to one or more embodiments includes a lens plate member including a plurality of lenses arranged in a first direction; and a light block member provided facing the lens plate member and including a plurality of opening portions arranged in the first direction, the opening portions being provided in one-to-one correspondence with the lenses. A first positioning portion is formed at a first position in first direction of each of the lens plate member and the light block member. The first positioning portion of the lens plate member and the first positioning portion of the light block member align with each other and continuously extend in a second direction along an optical axis direction of the lenses.

公开(公告)号：US10175604B2

公开(公告)日：2019-01-08

申请号：US15435375

申请日：2017-02-17

Applicant: Oki Data Corporation

Inventor： Akihiro Yamamura

IPC: G02B27/10 ,  G03G15/04 ,  G02B3/00 ,  G02B7/02

Abstract: A lens unit includes a first lens array including a plurality of first lens elements. The first lens array satisfies D1≤0.25·P1 where P1 is a pitch in a first direction between optical axes of adjacent ones of the first lens elements, and D1 is a displacement amount that is an absolute value of a difference between a first length WE1 from a center position of the first lens array to an end position of the first lens array in the first direction at a first temperature, and a second length WE2 from the center position of the first lens array to the end position of the first lens array at a second temperature higher than the first temperature by 30° C.

公开(公告)号：US09776427B2

公开(公告)日：2017-10-03

申请号：US15160354

申请日：2016-05-20

Applicant: Oki Data Corporation

Inventor： Akihiro Yamamura ,  Eisuke Kuroki

IPC: B41J2/45 ,  G03G15/04

CPC classification number: B41J2/45 ,  G03G15/04054 ,  G03G15/0409

Abstract: An exposure device includes an optical system member that forms an image of light from a light emitting element array having multiple light emitting elements arranged, an optical system support part that supports the optical system member, and a restraining member that restrains the optical system member to the optical system support part. The optical system support part has sliding parts, which are able to slide relative to the restraining member, formed on a light emitting element side face and an image forming side face in positions opposing the both end parts or the vicinity of both end parts in a longitudinal direction of the optical system support part, and in the both end parts or in the vicinity of the both end parts in the longitudinal direction, the restraining member is formed between the sliding parts and the optical system member, fixed to the optical system member, and slidable in the longitudinal direction relative to the optical system support part.

公开(公告)号：US08922894B2

公开(公告)日：2014-12-30

申请号：US13897479

申请日：2013-05-20

Applicant: Oki Data Corporation

Inventor： Akihiro Yamamura

IPC: G02B27/10 ,  F21K99/00 ,  G02B3/00 ,  G02B26/12

CPC classification number: F21K9/50 ,  G02B3/005 ,  G02B3/0056 ,  G02B3/0062 ,  G02B3/0068 ,  G02B26/123 ,  G02B26/125

Abstract: A lens unit includes a first lens plate including first lenses arranged in a first direction and configured to form an intermediate image being an inverted reduced image of an object, a second lens plate including second lenses arranged in the first direction and configured to form an inverted enlarged image of the intermediate image on a light reception surface, and a positioning portion being in contact with both a butting portion formed on the first lens plate and a butting portion formed on the second lens plate.

Abstract translation: 透镜单元包括：第一透镜板，包括沿第一方向布置的第一透镜，并且被配置为形成作为物体的反转缩小图像的中间图像;第二透镜板，包括沿第一方向布置的第二透镜， 在光接收表面上的中间图像的放大图像，以及与形成在第一透镜板上的对接部分和形成在第二透镜板上的对接部分接触的定位部分。

公开(公告)号：US08780417B2

公开(公告)日：2014-07-15

申请号：US13683089

申请日：2012-11-21

Applicant: Oki Data Corporation

Inventor： Akihiro Yamamura

IPC: H04N1/04

CPC classification number: H04N1/10 ,  F21V5/04 ,  G02B7/021 ,  G03G15/04036 ,  G03G15/60 ,  G03G2215/00177 ,  G03G2215/00185 ,  H04N1/02865 ,  H04N1/0303 ,  H04N1/1017 ,  H04N2201/02462 ,  H04N2201/02481 ,  H04N2201/02495

Abstract: A lens array includes a first lens row including first lenses arranged in a first direction, a second lens row including second lenses arranged in a direction substantially parallel with the first direction, a first boundary being a boundary between the first lenses adjacent to each other, a second boundary being a boundary between each of the first lenses and the second lens adjacent to the first lens, and a first join portion where the first boundary and the second boundary join each other. At the first joint portion, the first boundary and the second boundary contact each other with no step as seen in a plane that is substantially orthogonal to the first direction.

Abstract translation: 透镜阵列包括：第一透镜列，包括沿第一方向布置的第一透镜;第二透镜行，包括沿与第一方向大致平行的方向布置的第二透镜;第一边界，第一透镜彼此相邻的边界; 第二边界是第一透镜和与第一透镜相邻的第二透镜之间的边界，以及第一边界和第二边界彼此连接的第一连接部。 在第一关节部分，第一边界和第二边界在基本上与第一方向正交的平面中看不到步骤。