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公开(公告)号：US20230141025A1
公开(公告)日：2023-05-11
申请号：US18148616
申请日：2022-12-30
Applicant: FUJIFILM Corporation
Inventor： Akiko WATANO , Yukito SAITOH , Takao TAGUCHI , Keisuke KODAMA , Shunya KATOH , Yujiro YANAI
IPC: G01B11/25
CPC classification number: G01B11/25
Abstract: Provided are: a sensor that is used as a distance-measuring sensor or the like and where a high SN ratio can be obtained and high-accuracy measurement can be performed even in a case where an environmental temperature changes; and a band pass filter that is used for the sensor. The sensor includes: a light source; a band pass filter; and a light-receiving element, in which the band pass filter includes a band pass layer and a support that supports the band pass layer, and in a case where a thermal expansion coefficient of the band pass layer is represented by α1, an elastic modulus of the band pass layer is represented by E1, a thermal expansion coefficient of the support is represented by α2, and an elastic modulus of the support is represented by E2, α1>α2 and E1
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公开(公告)号：US20230123608A1
公开(公告)日：2023-04-20
申请号：US18067329
申请日：2022-12-16
Applicant: FUJIFILM Corporation
Inventor： Yuki FUKUSHIMA , Keisuke KODAMA , Shunya KATOH , Mitsuyoshi ICHIHASHI , Yukito SAITOH , Takashi YONEMOTO , Hiroshi SATO
Abstract: An optical element includes an optically-anisotropic layer that is formed of a liquid crystal composition including a liquid crystal compound having a polymerizable group, in which a ratio of a bend elastic constant K33 to a splay elastic constant K11 in the liquid crystal composition satisfies 0.8≤K33/K11≤1.2 at any temperature of a nematic temperature range, and 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.
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公开(公告)号：US20220382000A1
公开(公告)日：2022-12-01
申请号：US17886535
申请日：2022-08-12
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Katsumi SASATA , Hiroshi SATO
IPC: G02B6/42
Abstract: Provided are a small-sized optical coupling system and an optical communication device using the optical coupling system. An optical coupling system includes a liquid crystal optical element, and a photonic device having a plurality of photonic chips, and couples an optical fiber to the photonic device, in which each of the photonic chips includes a grating coupler, the liquid crystal optical element separates incident signal light depending on at least one of polarization or a wavelength to emit light in different directions, and each separated signal light component is incident into the grating coupler of the corresponding photonic chip.
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公开(公告)号：US20220326565A1
公开(公告)日：2022-10-13
申请号：US17849167
申请日：2022-06-24
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Hiroshi SATO
IPC: G02F1/1335 , G02F1/137
Abstract: Provided is an optical scanning device having a stable scanning direction corresponding to a temperature fluctuation of a semiconductor laser by being provided with a predetermined liquid crystal optical element utilizing a characteristic of a linear expansion coefficient of a support of a liquid crystal diffraction element. An optical scanning device includes: a light source; and a light deflection element, in which the light deflection element includes a support and an optically anisotropic layer which is a cured layer of a liquid crystal composition, an optical axis of a liquid crystal compound contained in the liquid crystal composition is parallel to a surface of the optically anisotropic layer, and the optically anisotropic layer has a liquid crystal alignment pattern which is arranged along at least one in-plane direction of the optically anisotropic layer and in which an orientation of the optical axis of the liquid crystal compound changes continuously and rotationally, and the support satisfies Conditional Expression (1): |dλ/(dt×λ0)−α|
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公开(公告)号：US20220291511A1
公开(公告)日：2022-09-15
申请号：US17824506
申请日：2022-05-25
Applicant: FUJIFILM Corporation
Inventor： Hiroshi SATO , Katsumi SASATA , Yukito SAITOH
IPC: G02B27/01 , G02B27/28 , F21V8/00 , G02F1/1335 , G02F1/137 , G02F1/13363
Abstract: An object is to provide: an optical member with which an image display apparatus where multiple images are suppressed can be obtained; and an image display apparatus including the optical member. The optical member includes: a light guide element that includes a light guide plate, first and second incidence diffraction elements, and first and second emission diffraction elements; a wavelength selective retardation layer that functions as a retardation layer with respect to a specific wavelength range, the wavelength selective retardation layer changing a polarized state of light diffracted by the first or second emission diffraction element; and a polarizer, in which the first and second emission diffraction elements are polarization diffraction elements and diffract light components such that the diffracted light components are polarized light components having opposite properties, the first and second emission diffraction elements, the wavelength selective retardation layer, and the polarizer are provided to overlap each other in a main surface of the light guide plate, and the wavelength selective retardation layer is provided between the light guide element and the polarizer.
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Patent Agency Ranking
公开(公告)号：US20220146742A1
公开(公告)日：2022-05-12
申请号：US17583433
申请日：2022-01-25
Applicant: FUJIFILM Corporation
Inventor： Fumitake MITOBE , Keisuke KODAMA , Katsumi SASATA , Yukito SAITOH
Abstract: Provided are a backlight unit and a liquid crystal display device including the backlight unit, the backlight unit being capable of switching between viewing angles in the liquid crystal display device and having a configuration in which the brightness values of emitted light on the “+” side and the “−” side at a polar angle with respect to the normal line are symmetric to each other. The backlight unit includes: a light guide plate; a first light source that guides light into the light guide plate from a long side or a short side of the light guide plate; a second light source that guides light into the light guide plate from a side of the light guide plate different from that of the first light source; a first diffraction element that is provided on one main surface of the light guide plate and diffracts only light emitted from one of the first light source or the second light source; a second diffraction element that is provided on another main surface of the light guide plate and diffracts only light emitted from another one of the first light source or the second light source; and a reflection plate that is provided on a surface of the light guide plate opposite to a light emission surface.
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公开(公告)号：US20220099872A1
公开(公告)日：2022-03-31
申请号：US17344424
申请日：2021-06-10
Applicant: FUJIFILM Corporation
Inventor： Katsumi SASATA , Hiroshi SATO , Yukito SAITOH
Abstract: Provided are a cholesteric liquid crystal layer having a high diffraction efficiency, a method of forming the same, and a laminate, a light guide element, and an image display device that include the cholesteric liquid crystal layer. The cholesteric liquid crystal layer is obtained by immobilizing a cholesteric liquid crystalline phase, in which the cholesteric liquid crystal layer 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 a cross-section observed with a SEM, bright portions and dark portions are tilted, in a case where a tilt angle of a direction in which an in-plane retardation is minimum with respect to a normal line in a slow axis plane or a fast axis plane is represented by θ2, an absolute value of an optical axis tilt angle φ represented by “sin θ2=n·sin φ (n represents an average refractive index of the cholesteric liquid crystal layer)” is 5° or more.
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公开(公告)号：US20210302744A1
公开(公告)日：2021-09-30
申请号：US17226193
申请日：2021-04-09
Applicant: FUJIFILM Corporation
Inventor： Yukito SAITOH , Hiroshi SATO , Katsumi SASATA
IPC: G02B27/01 , G02F1/13363 , G02F1/139 , G02F1/1335
Abstract: An object of the present invention is to provide an optical element capable of widening a field of view of an AR glass or the like; and an image display device using the optical element. The object is accomplished with an optical element including a light guide plate; a switching λ/2 plate capable of switching a phase difference between zero and λ/2; and a first optically anisotropic layer that is arranged between the light guide plate and the switching λ/2 plate, is formed using a composition including a liquid crystal compound, and has a liquid crystal alignment pattern in which an orientation of an optical axis derived from the liquid crystal compound changes while continuously rotating along at least one in-plane direction of the first optically anisotropic layer.
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公开(公告)号：US20210231985A1
公开(公告)日：2021-07-29
申请号：US17226479
申请日：2021-04-09
Applicant: FUJIFILM Corporation
Inventor： Hiroshi SATO , Yukito SAITOH , Katsumi SASATA
IPC: G02F1/11 , G02F1/1335
Abstract: Provided are an optical laminate in which a large diffraction angle can be obtained, a light guide element, and an AR display device. The optical laminate includes, in the following order: a first optically-anisotropic layer that is formed of a composition including a liquid crystal compound and has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound continuously rotates in at least one in-plane direction; a phase difference layer; and a patterned cholesteric liquid crystal layer that is formed of a composition including a liquid crystal compound and has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound continuously rotates in at least one in-plane direction, the liquid crystal compound being cholesterically aligned, in which in the first optically-anisotropic layer and the patterned cholesteric liquid crystal layer, the one in-plane directions in which the direction of the optical axis derived from the liquid crystal compound continuously rotates are the same, and rotation directions of the direction of the optical axis derived from the liquid crystal compound in the one in-plane direction are the same.
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公开(公告)号：US20210223448A1
公开(公告)日：2021-07-22
申请号：US17226329
申请日：2021-04-09
Applicant: FUJIFILM Corporation
Inventor： Hiroshi SATO , Yukito SAITOH , Katsumi SASATA
Abstract: Provided are an optical laminate that can refract incident light with a high use efficiency to be incident into a light guide plate or the like, and a light guide element and an image display device including the optical laminate. The optical laminate includes first and second cholesteric liquid crystal layers that have 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 in the first and second cholesteric liquid crystal layers, helical pitches in a cholesteric liquid crystalline phase are different from each other, turning directions of circularly polarized light to be reflected are the same, and rotation directions of the direction of the optical axis that continuously rotates in at least one in-plane direction in the liquid crystal alignment pattern are the same.
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