公开(公告)号：US20250015474A1

公开(公告)日：2025-01-09

申请号：US18894769

申请日：2024-09-24

Applicant: FUJIFILM Corporation

Inventor： Hideki YASUDA ,  Yukito SAITOH

IPC: H01P3/20 ,  B82Y20/00 ,  B82Y30/00

Abstract: A metalens capable of concentrating terahertz waves having a high light concentration efficiency. The metalens includes a first region that has a plurality of microstructures disposed therein to concentrate terahertz waves; and a second region that is a region that surrounds the first region and that is a region different from the first region, in which in a case where terahertz waves having a wavelength of 0.3 mm, a wavelength of 1 mm, and a wavelength of 3 mm are incident, assuming that a wavelength having a highest light concentration efficiency is a wavelength X, a transmittance of the terahertz waves having the wavelength X in the first region is a transmittance T1, and a transmittance of the terahertz waves having the wavelength X in the second region is a transmittance T2, the transmittance T2 is lower than the transmittance T1.

公开(公告)号：US20240369900A1

公开(公告)日：2024-11-07

申请号：US18774749

申请日：2024-07-16

Applicant: FUJIFILM Corporation

Inventor： Kazuya HISANAGA ,  Yukito SAITOH ,  Yujiro YANAI

IPC: G02F1/31

Abstract: Provided is a wavelength selective switch where crosstalk is improved and miniaturization is realized. The wavelength selective switch includes: one or more input ports; one or more output ports; a polarization controller that adjusts a polarization state of light incident from the input ports; a dispersive element that demultiplexes wavelength-multiplexed light incident from the input ports; and a deflection element that controls deflection of the demultiplexed light. The dispersive element is a liquid crystal diffraction element having a liquid crystal alignment pattern where an orientation of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one in-plane direction.

公开(公告)号：US20240369743A1

公开(公告)日：2024-11-07

申请号：US18773316

申请日：2024-07-15

Applicant: FUJIFILM Corporation

Inventor： Hiroshi SATO ,  Yukito SAITOH ,  Katsumi SASATA

IPC: G02B5/02 ,  G02B5/30

Abstract: Provided are an optical element, including a plurality of optically anisotropic layers, each of which has an in-plane alignment pattern in which orientations of optical axes derived from a liquid crystal compound change continuously and rotationally along at least one in-plane direction, in a thickness direction, in which the optically anisotropic layers each have regions where lengths over which the orientations of the optical axes rotate by 180° in the one direction are different from each other, and at least one of the plurality of optically anisotropic layers is an inclined optically anisotropic layer having a region where a plurality of pairs of bright lines and dark lines in a cross-sectional image are present and the pairs of the bright lines and the dark lines are inclined at inclination angles which are different from each other with respect to a normal line of an interface of the optically anisotropic layer.

公开(公告)号：US20240134098A1

公开(公告)日：2024-04-25

申请号：US18541062

申请日：2023-12-15

Applicant: FUJIFILM Corporation

Inventor： Yukito SAITOH ,  Hiroshi SATO ,  Takashi YONEMOTO

IPC: G02B5/18

CPC classification number: G02B5/1866

Abstract: Provided is a transmissive liquid crystal diffraction element that can diffract different polarized light components in the same direction and has high diffraction efficiency with respect to unpolarized light. The transmissive liquid crystal diffraction element includes first to fourth optically-anisotropic layers each of which has a liquid crystal alignment pattern in which a direction of an optical axis changes while continuously rotating in at least one in-plane direction, in which the optical axis in each of the first to the fourth optically-anisotropic layers is twisted in a thickness direction, rotation directions of the optical axes in the liquid crystal alignment patterns and twisted directions of the optical axes in the thickness direction are opposite to each other in the first optically-anisotropic layer and the second optically-anisotropic layer, rotation directions of the optical axes in the liquid crystal alignment patterns and twisted directions of the optical axes in the thickness direction are opposite to each other in the third optically-anisotropic layer and the fourth optically-anisotropic layer, single periods of the liquid crystal alignment patterns are the same in the first optically-anisotropic layer and the second optically-anisotropic layer, single periods of the liquid crystal alignment patterns are the same in the third optically-anisotropic layer and the fourth optically-anisotropic layer, and the single periods of the liquid crystal alignment patterns are different in the first optically-anisotropic layer and the third optically-anisotropic layer.

公开(公告)号：US20230229038A1

公开(公告)日：2023-07-20

申请号：US18176529

申请日：2023-03-01

Applicant: FUJIFILM Corporation

Inventor： Hiroshi SATO ,  Yukito SAITOH ,  Takashi YONEMOTO ,  Makoto ISHIGURO

IPC: G02F1/1335 ,  G02F1/1337

CPC classification number: G02F1/133504 ,  G02F1/133761 ,  G02F1/133541 ,  G02B5/3083

Abstract: Provided are a liquid crystal diffraction element having a high diffraction efficiency irrespective of diffraction angles, an optical element including the liquid crystal diffraction element, and an image display unit, a head-mounted display, a beam steering, and a sensor including the liquid crystal diffraction element or the optical element. The liquid crystal diffraction element includes: an optically-anisotropic layer that is formed of a liquid crystal composition including a liquid crystal compound, in which the optically-anisotropic layer has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, in a case where a length over which the direction of the optical axis derived from the liquid crystal compound rotates by 180° in a plane is set as a single period, a length of the single period in the liquid crystal alignment pattern gradually changes in the one in-plane direction, in a cross-sectional image of the optically-anisotropic layer obtained by observing a cross-section taken in a thickness direction parallel to the one in-plane direction with a scanning electron microscope, the optically-anisotropic layer has bright portions and dark portions extending from one surface to another surface and each of the dark portions has two or more inflection points of angle, the optically-anisotropic layer has regions where tilt directions of the dark portions are different from each other in the thickness direction, and an average tilt angle of the dark portion gradually changes in the one in-plane direction.

公开(公告)号：US20230194948A1

公开(公告)日：2023-06-22

申请号：US18173633

申请日：2023-02-23

Applicant: FUJIFILM Corporation

Inventor： Yukito SAITOH ,  Hiroshi SATO

IPC: G02F1/29 ,  G02F1/1337 ,  G02F1/1335

CPC classification number: G02F1/29 ,  G02F1/133757 ,  G02F1/133504

Abstract: An object of the present invention is to provide a light deflection device having a simple structure suitable for reducing the size and weight where a deflection angle can be increased. The object can be achieved with a light deflection device including: a light deflection element that deflects incident light in one direct to be emitted; a driving unit that drives the light deflection element; and a diffraction element that is disposed on a light emission side of the light deflection element in which a periodic structure pitch gradually changes from a center of deflection from the light deflection element toward an outside.

公开(公告)号：US20230097214A1

公开(公告)日：2023-03-30

申请号：US18056536

申请日：2022-11-17

Applicant: FUJIFILM Corporation

Inventor： Yukito SAITOH ,  Hiroshi SATO ,  Takashi YONEMOTO ,  Jun WATANABE ,  Mitsuyoshi ICHIHASHI ,  Keisuke KODAMA

IPC: G02B5/30

Abstract: A transmissive liquid crystal diffraction element includes a first optically-anisotropic layer and a second optically-anisotropic layer each of which has a liquid crystal alignment pattern in which a direction of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one in-plane direction, in which a rotation direction of the optical axis in the liquid crystal alignment pattern of the first optically-anisotropic layer and a rotation direction of the optical axis in the liquid crystal alignment pattern of the second optically-anisotropic layer are opposite to each other, and a single period of the liquid crystal alignment pattern in the first optically-anisotropic layer and a single period of the liquid crystal alignment pattern in the second optically-anisotropic layer are the same.

公开(公告)号：US20220390680A1

公开(公告)日：2022-12-08

申请号：US17886540

申请日：2022-08-12

Applicant: FUJIFILM Corporation

Inventor： Yukito SAITOH ,  Katsumi SASATA ,  Hiroshi SATO

IPC: G02B6/32 ,  H04B10/63 ,  G02B5/30 ,  G02B6/27 ,  G02B6/293 ,  G02B5/18 ,  G02B6/42

Abstract: Provided is an optical communication device, such as a wavelength locker, a wavelength demultiplexer, an optical coupling system, and an optical switching system, using a small-sized lens element. An optical communication device includes, as a lens element, a liquid crystal diffractive lens element having an optically anisotropic layer that is formed using a composition containing a liquid crystal compound, and has a liquid crystal alignment pattern in which an orientation of an optical axis of the liquid crystal compound changes while continuously rotating toward one direction, in a radial shape from an inside toward an outside, and in the liquid crystal alignment pattern, in a case where a length over which the orientation of the optical axis rotates by 180° in one direction in which the optical axis changes is a single period, a length of the single period gradually decreases from the inside toward the outside.

公开(公告)号：US20220373809A1

公开(公告)日：2022-11-24

申请号：US17849181

申请日：2022-06-24

Applicant: FUJIFILM Corporation

Inventor： Hiroshi SATO ,  Katsumi SASATA ,  Yukito SAITOH

IPC: G02B27/01 ,  G02F1/1337 ,  G02F1/1335

Abstract: Provided are: an image display apparatus that can display augmented reality in a virtual image is superimposed on a bright real scene; and AR glasses including the image display apparatus. The image display apparatus includes: a display element; and a reflective polarization diffraction element that reflects an image displayed by the display element, in which the polarization diffraction element has a region where a period of a diffraction structure decreases in a direction away from the display element.

公开(公告)号：US20220333987A1

公开(公告)日：2022-10-20

申请号：US17849286

申请日：2022-06-24

Applicant: FUJIFILM Corporation

Inventor： Hiroshi SATO ,  Yukito SAITOH

IPC: G01J3/18 ,  G02B5/30 ,  G02B27/30 ,  G02B5/18 ,  G01J3/50 ,  G01J3/02 ,  G02B27/42

Abstract: Provided are a hyperspectral sensor and a hyperspectral camera in which influence of external information such as a reflecting material is reduced such that the spectral data accuracy of a subject to be acquired can be improved. In the hyperspectral sensor in which light from a subject is split into light components in a plurality of wavelength ranges by a spectral optical element and each of the light components in the wavelength ranges is received by a sensor array consisting of a plurality of photodetection elements to acquire spectral data in which spectral information of the subject is associated with each of the photodetection elements, a polarization diffraction element that emits polarized light is used as the spectral optical element.