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公开(公告)号：US20230033943A1
公开(公告)日：2023-02-02
申请号：US17876494
申请日：2022-07-28
Applicant: SEIKO EPSON CORPORATION
Inventor： Osamu YOKOYAMA , Atsushi SAITO , Toshiyuki NOGUCHI
Abstract: An optical element includes a substrate and a first hologram element provided on one side of the substrate, and a second hologram element provided on another side of the substrate. The first hologram element is provided to overlap with the second hologram element in a front view. The first hologram element includes a first hologram layer that diffracts part of incident light in a first wavelength band and that transmits another part of the incident light in the first wavelength band. The second hologram element includes a second hologram layer that diffracts, toward the first hologram layer through diffraction, part of light in the first wavelength band transmitted through the first hologram layer and that transmits other part of the light in the first wavelength band transmitted through the first hologram layer.
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公开(公告)号：US20220035157A1
公开(公告)日：2022-02-03
申请号：US17389358
申请日：2021-07-30
Applicant: SEIKO EPSON CORPORATION
Inventor： Osamu YOKOYAMA
Abstract: Provided is a virtual image display device including an imaging light emitting device, a light-guiding member configured to guide imaging light emitted from the imaging light emitting device, and an emission-side diffraction element provided at a light-emitting portion of the light-guiding member and configured to emit the imaging light by diffraction. In the emission-side diffraction element, a light amount difference between a first component light and a second component light of the imaging light, the first component light being emitted as a central image at a first angle σ of 0° and the second component light being emitted as a peripheral image at a second angle σ of ±θ (θ>0°), is equal to or less than 20%.
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公开(公告)号：US20210302739A1
公开(公告)日：2021-09-30
申请号：US17210422
申请日：2021-03-23
Applicant: SEIKO EPSON CORPORATION
Inventor： Osamu YOKOYAMA
Abstract: Included are a first display element configured to display a first virtual image; a second display element configured to display a second virtual image; a combining optical member configured to combine first imaging light and second imaging light; a light-guiding optical system configured to guide light that passed through the combining optical member; and a correction optical system provided between the first display element and the combining optical member and configured to correct an aberration in accordance with a positional difference between the first display element and the second display element.
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公开(公告)号：US20210191131A1
公开(公告)日：2021-06-24
申请号：US17197249
申请日：2021-03-10
Applicant: SEIKO EPSON CORPORATION
Inventor： Osamu YOKOYAMA
Abstract: A light flux diameter expanding element includes a light guiding plate with a light input face and a light output face, and with a thickness of 0.2 mm to 0.8 mm; a diffraction grating on the input side; and a diffraction grating on the output side, and is provided so as to have the same grating period as that of the diffraction grating on the input side, in which a forming region of the diffraction grating on the input side is smaller than that of the output side, and a grating period of the diffraction grating on the input side is a period in which a small diffraction angle in diffraction angles of +1-st order diffracted light and −1-st order diffracted light, which are diffracted in the diffraction grating on the input side, in the light guiding plate becomes larger than a critical angle of the light guiding plate.
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Patent Agency Ranking
公开(公告)号：US20210033870A1
公开(公告)日：2021-02-04
申请号：US16942489
申请日：2020-07-29
Applicant: SEIKO EPSON CORPORATION
Inventor： Osamu YOKOYAMA
Abstract: An optical device of the present disclosure includes a first light guide body including a first light-incident portion provided with a first incidence-side diffraction element, and a second light guide body including a second light-incident portion provided with a second incidence-side diffraction element, wherein the second light guide body, when light is caused to enter the first light-incident portion, is disposed at a position at which a part of the light passing through the first light guide body enters the second light-incident portion, and the second incidence-side diffraction element is an element that diffracts light of monochromatic color at a smaller angle than the first incidence-side diffraction element does, when the light of monochromatic color is caused to enter at a same angle.
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公开(公告)号：US20210033869A1
公开(公告)日：2021-02-04
申请号：US16942095
申请日：2020-07-29
Applicant: SEIKO EPSON CORPORATION
Inventor： Osamu YOKOYAMA
Abstract: An image display device includes, an imaging light generation part configured to generate an imaging light having a single color, a light-guiding plate, an incident side diffraction element provided at a light incident part of the light-guiding plate, and configured to cause the imaging light to enter the light-guiding plate, an exit side diffraction element provided at a light emitting part of the light-guiding plate, and configured to cause the imaging light propagating within the light-guiding plate to exit, and an angle dependent reflective film provided between the light-guiding plate and the exit side diffraction element, and having a reflectance varying depending on magnitude of a propagation angle of the imaging light, in which the reflectance for the imaging light propagating at a relatively small propagation angle is larger than the reflectance for the imaging light propagating at a relatively large propagation angle.
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公开(公告)号：US20190265479A1
公开(公告)日：2019-08-29
申请号：US16282822
申请日：2019-02-22
Applicant: SEIKO EPSON CORPORATION
Inventor： Osamu YOKOYAMA
Abstract: A virtual image display device of the invention includes an image display element configured to emit image light, a relay optical system configured to generate an intermediate image of the image light emitted from the image display element, and an ocular optical element configured to reflect the intermediate image toward a position assumed to be a position of an eye of an observer to generate an enlarged virtual image. The relay optical system includes a prism, and the prism includes a first bending surface including a bending surface and serving as an incident surface, a second bending surface including a bending surface and serving as an emission surface, and a reflecting surface configured to reflect, toward the second bending surface, the image light incident from the first bending surface.
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公开(公告)号：US20190049735A1
公开(公告)日：2019-02-14
申请号：US16165221
申请日：2018-10-19
Applicant: SEIKO EPSON CORPORATION
Inventor： Osamu YOKOYAMA , Masatoshi YONEKUBO , Takashi TAKEDA , Daisuke ISHIDA , Mitsutaka IDE , Hidemitsu SORIMACHI
Abstract: An image display device with which it is possible to visually recognize an image while securing the see-through property regardless of eye movements and changes in interpupillary distance, with which it is possible to display a large-size image with high quality, and which is small, has excellent wearability, and has an excellent external appearance.
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公开(公告)号：US20170248789A1
公开(公告)日：2017-08-31
申请号：US15433618
申请日：2017-02-15
Applicant: SEIKO EPSON CORPORATION
Inventor： Osamu YOKOYAMA
CPC classification number: G02B27/0172 , G02B5/1842 , G02B5/1866 , G02B6/124 , G02B26/105 , G02B2005/1804 , G02B2027/011 , G02B2027/0112 , G02B2027/0118 , G02B2027/013 , G02B2027/0178
Abstract: A light flux diameter expanding element includes a light guiding plate with a light input face and a light output face, and with a thickness of 0.2 mm to 0.8 mm; a diffraction grating on the input side; and a diffraction grating on the output side, and is provided so as to have the same grating period as that of the diffraction grating on the input side, in which a forming region of the diffraction grating on the input side is smaller than that of the output side, and a grating period of the diffraction grating on the input side is a period in which a small diffraction angle in diffraction angles of +1-st order diffracted light and −1-st order diffracted light, which are diffracted in the diffraction grating on the input side, in the light guiding plate becomes larger than a critical angle of the light guiding plate.
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