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1.发明申请公开(公告)号：US20210003763A1
公开(公告)日：2021-01-07
申请号：US16849010
申请日：2020-04-15
Applicant: Hitachi-LG Data Storage, Inc.
Inventor： Mayumi SASAKI , Takeru UTSUGI
Abstract: A hologram recording device for producing a hologram that diffracts incident light includes: a laser light source; a first half-wave plate that controls a polarization direction of a light beam emitted from the laser light source; a polarizing beam splitter that reflects S-polarized light to emit the S-polarized light as an “A” light ray and transmits P-polarized light to emit the P-polarized light as a “B” light ray with respect to the light beam passing through the first half-wave plate, and splits the light beam in two directions; a first wedge prism mirror that reflects the “A” light ray; a second half-wave plate that polarizes the “B” light ray into S-polarized light; a second wedge prism mirror that reflects the S-polarized light polarized by the second half-wave plate; and a recording medium irradiated with light rays reflected by the first wedge prism mirror and the second wedge prism mirror.
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2.发明申请公开(公告)号：US20200278546A1
公开(公告)日：2020-09-03
申请号：US16759376
申请日：2018-11-22
Applicant: Hitachi-LG Data Storage, Inc.
Inventor： Takeru UTSUGI , Ryuji UKAI
Abstract: The present invention provides a light-guiding plate which is applicable to incident rays over a wide ray angular range and wide wavelength rage, and is able to suppress a decrease in optical efficiency. A light-guiding plate 200 having a light diffracting portion 1200 for diffracting incident light by a multiple-recorded hologram is configured such that, in the light diffracting portion, when light 1210 of a single wavelength having a certain angular range is incident, at least two or more outgoing rays 1220 are discretely emitted with a first angular space θs, and the emitted rays each have a second angular range θa, and the first angular space θs is equal to or larger than the second angular range θa.
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公开(公告)号：US20210055693A1
公开(公告)日：2021-02-25
申请号：US15931653
申请日：2020-05-14
Applicant: Hitachi-LG Data Storage, Inc.
Inventor： Takeru UTSUGI , Hiromichi YAMAKAWA
Abstract: Provided is a waveguide having a light diffraction unit that diffracts incident light by a multiplex-recorded hologram, in which, in the light diffraction unit, a plurality of holograms having different angles with respect to an incident surface of the waveguide are formed, and when certain parallel light beams are incident, different wavelengths are diffracted by the plurality of holograms.
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Patent Agency Ranking
公开(公告)号：US20210033864A1
公开(公告)日：2021-02-04
申请号：US16902319
申请日：2020-06-16
Applicant: Hitachi-LG Data Storage, Inc.
Inventor： Tomoto KAWAMURA , Takeru UTSUGI , Mitsuru NAGASAWA , Hiromichi YAMAKAWA
Abstract: It is an objective of this disclosure to protect a highly transparent hologram light guide plate from water vapor and ultraviolet ray, thereby suppressing deterioration of the hologram light guide plate even when employed in a head mount display used in outdoor environments. A hologram light guide plate according to this disclosure comprises a protection layer that protects a hologram layer and an intermediate layer that is placed between a glass layer and the protection layer, wherein the glass layer and the hologram layer form a transfer layer that transfers image light. The intermediate layer causes the image light to transfer only in the transfer layer in a section from an input area of the image light to an output area of the image light.
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公开(公告)号：US20160041525A1
公开(公告)日：2016-02-11
申请号：US14816441
申请日：2015-08-03
Applicant: Hitachi-LG Data Storage, Inc.
Inventor： Takeru UTSUGI , Kazuyoshi YAMAZAKI
CPC classification number: G03H1/265 , G02B5/32 , G02B27/0927 , G02B27/0944 , G03H2223/18 , G03H2223/23 , G11B7/0065 , G11B7/08564 , G11B7/1353 , G11B7/1359
Abstract: To reduce an influence of stray light and stably record/reproduce high-quality data in holographic recording/reproduction. A holographic memory device includes an optical system that guides a reference beam to an optical information recording medium at a desired angle of incidence, a control part that controls the angle of incidence of the reference beam generated in the optical system, and a lens part that images the reference beam in a desired position of the optical information recording medium. Further, at least a first light beam at a first angle and a second light beam at a second angle different from the first angle are output from the optical element, and the optical element is provided so that the first light beam may propagate within an effective diameter of the lens part and the second light beam may propagate to an outside of the effective diameter of the lens part.
Abstract translation: 减少杂散光的影响，稳定地记录/再现全息记录/再现中的高质量数据。 一种全息存储器件包括一个光学系统，该光学系统将参考光束以期望的入射角度引导到光学信息记录介质;控制部分，其控制在光学系统中产生的参考光束的入射角;以及透镜部分， 将参考光束成像在光学信息记录介质的期望位置。 此外，从光学元件输出至少第一角度的第一光束和与第一角度不同的第二角度的第二光束，并且提供光学元件，使得第一光束可以在有效 透镜部分的直径和第二光束可以传播到透镜部分的有效直径的外侧。
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公开(公告)号：US20220413204A1
公开(公告)日：2022-12-29
申请号：US17764623
申请日：2020-10-06
Applicant: HITACHI-LG DATA STORAGE, INC.
Inventor： Ryuji UKAI , Takahiro MOURI , Takeru UTSUGI , Toshiteru NAKAMURA , Takuma KUNO , Masahito UCHIYAMA
Abstract: According to the invention, a light guide plate-type video display device and a video display system that are capable of displaying a video with less color deviation and less video distortion are provided. A video display device 101 configured to display a video includes a video projection unit 200 configured to project video light, a video deflection unit 210, and a light guide portion 230. The video deflection unit 210 deflects video light emitted by the video projection unit 200 and causes the video light to propagate to the light guide portion 230, and the light guide portion 230 causes the entered video light to propagate therein and outputs the video light. Here, the video deflection unit 210 or the light guide portion 230 is configured to reduce color dispersion of the video light outputted from the light guide portion 230.
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公开(公告)号：US20210382309A1
公开(公告)日：2021-12-09
申请号：US17327874
申请日：2021-05-24
Applicant: Hitachi-LG Data Storage, Inc.
Inventor： Takeru UTSUGI , Tomoto KAWAMURA
IPC: G02B27/01
Abstract: An objective of the present disclosure is to provide an image display device capable of (1) improving light utilization efficiency in a waveguide direction, and (2) overcoming a trade-off relationship between FoV and an eye-box in a non-waveguide direction. In the image display device according to the present disclosure, the waveguide includes a first angle conversion region for angular conversion of first image light, and a second angle conversion region for angular conversion of second image light in a direction different from the first image light.
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8.发明申请公开(公告)号：US20210165224A1
公开(公告)日：2021-06-03
申请号：US17049981
申请日：2019-07-02
Applicant: Hitachi-LG Data Storage, Inc.
Inventor： Takeru UTSUGI
Abstract: The purpose of the present invention is to provide a waveguide, a method for manufacturing the waveguide, and an image display device using the same, which can be applied to incident light with a wide light angle range and a wide wavelength range, and can suppress a decrease in optical efficiency while maintaining high see-through performance. In order to achieve the above purpose, the waveguide has a light diffraction unit that diffracts the incident light by a multiplex-recorded hologram, wherein the light diffraction unit has at least two regions, and the light diffraction unit diffracts light of different wavelengths by the respective regions when certain parallel light ray is incident.
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