公开(公告)号：US11598971B2

公开(公告)日：2023-03-07

申请号：US16798951

申请日：2020-02-24

Applicant: Fusao Ishii ,  NTT DOCOMO, INC.

Inventor： Fusao Ishii ,  Mikiko Nakanishi ,  Kazuoki Ichikawa ,  Yuji Aburakawa

IPC: G02B27/28 ,  G02B27/01

Abstract: A compact light source for a projection display is disclosed enabling eye-glass display using a Fresnel mirror reflecting light without a distance as conventional prism type reflector.

公开(公告)号：US11073694B2

公开(公告)日：2021-07-27

申请号：US15843330

申请日：2017-12-15

Applicant: Fusao Ishii ,  NTT DOCOMO, Inc.

Inventor： Fusao Ishii ,  Mikiko Nakanishi ,  Kazuhiko Takahashi ,  Yuji Abrakawa ,  Keiichi Murakami

IPC: G02B27/01 ,  G02B26/08 ,  G02B26/10

Abstract: A see-through image display system having a laser-beam-scanner has a very small eyebox when a laser beam is directly projected into eye. This invention provides a solution to increase the size of eyebox using a free-form-mirror to create a real image with high NA without exit-pupil-expander.

公开(公告)号：US11231529B2

公开(公告)日：2022-01-25

申请号：US16252627

申请日：2019-01-19

Applicant: Fusao Ishii ,  NTT DOCOMO, Inc.

Inventor： Fusao Ishii ,  Mikiko Nakanishi ,  Kazuhiko Takahashi ,  Yuji Aburakawa

IPC: G02B5/02 ,  G02B27/30 ,  G02B5/32

Abstract: A compact integrator of light beams is disclosed using a diffractive optical element to integrate multiple beams into a single beam regardless of wavelength or polarization.

公开(公告)号：US20190227204A1

公开(公告)日：2019-07-25

申请号：US16252627

申请日：2019-01-19

Applicant: Fusao Ishii ,  NTT DOCOMO, Inc.

Inventor： Fusao Ishii ,  Mikiko Nakanishi ,  Kazuhiko Takahashi ,  Yuji Aburakawa

IPC: G02B5/02 ,  G03B21/14 ,  G02B5/32 ,  G02B27/30

Abstract: A compact integrator of light beams is disclosed using a diffractive optical element to integrate multiple beams into a single beam regardless of wavelength or polarization.

公开(公告)号：US11656458B2

公开(公告)日：2023-05-23

申请号：US16934536

申请日：2020-07-21

Applicant: Fusao Ishii ,  NTT DOCOMO, INC.

Inventor： Fusao Ishii ,  Mikiko Nakanishi ,  Kazuoki Ichikawa ,  Mikio Iwamura

IPC: G02B26/00 ,  G02B27/01 ,  G02B27/12 ,  F21V8/00 ,  G02B13/22 ,  G02B5/09

CPC classification number: G02B27/0101 ,  G02B5/09 ,  G02B6/001 ,  G02B6/0006 ,  G02B6/0028 ,  G02B6/0075 ,  G02B13/22 ,  G02B2027/0123

Abstract: A projection display having an optical light guide for a see-though display system using holographic optical element or diffractive optical element as in-coupling optics and combined with Fresnel mirrors as out-coupling optics is disclosed. A display using this light guide enables a wide angle (e.g., over 90 degrees field of view), high resolution, and a large eye-box with a compact size.

公开(公告)号：US20180275333A1

公开(公告)日：2018-09-27

申请号：US15843352

申请日：2017-12-15

Applicant: Fusao Ishii ,  NTT DOCOMO, INC.

Inventor： Fusao Ishii ,  Mikiko Nakanishi ,  Kazuhiko Takahashi ,  Yuji Abrakawa ,  Keiichi Murakami

IPC: F21V8/00 ,  G02B27/01 ,  G02B27/48 ,  G02B27/18

CPC classification number: G02B6/0031 ,  G02B27/0172 ,  G02B27/18 ,  G02B27/48 ,  G02B2027/011 ,  G02B2027/0118 ,  G02B2027/0123 ,  G02B2027/0174 ,  G02B2027/0178

Abstract: A see-through image display system having a DOE often has undesirable light or so called ghost images due to the quantization of saw tooth shape of DOE surface. This invention provides ways to eliminate ghost images.

公开(公告)号：US20210026135A1

公开(公告)日：2021-01-28

申请号：US16934536

申请日：2020-07-21

Applicant: Fusao Ishii ,  NTT DOCOMO, INC.

Inventor： Fusao Ishii ,  Mikiko Nakanishi ,  Kazuoki Ichikawa ,  Mikio Iwamura

IPC: G02B27/01 ,  F21V8/00 ,  G02B5/09 ,  G02B13/22

Abstract: A projection display having an optical light guide for a see-though display system using holographic optical element or diffractive optical element as in-coupling optics and combined with Fresnel mirrors as out-coupling optics is disclosed. A display using this light guide enables wide angle (e.g., over 90 degrees FOV), high resolution, and large eye-box with compact size.

公开(公告)号：US20200271931A1

公开(公告)日：2020-08-27

申请号：US15843330

申请日：2017-12-15

Applicant: Fusao Ishii ,  NTT DOCOMO, INC.

Inventor： Fusao Ishii ,  Mikiko Nakanishi ,  Kazuhiko Takahashi ,  Yuji Abrakawa ,  Keiichi Murakami

IPC: G02B27/01 ,  G02B26/08 ,  G02B26/10

Abstract: A see-through image display system having a laser-beam-scanner has a very small eyebox when a laser beam is directly projected into eye. This invention provides a solution to increase the size of eyebox using a free-form-mirror to create a real image with high NA without exit-pupil-expander.

公开(公告)号：US20190155216A1

公开(公告)日：2019-05-23

申请号：US16252619

申请日：2019-01-19

Applicant: Fusao Ishii ,  NTT DOCOMO, Inc.

Inventor： Fusao Ishii ,  Mikiko Nakanishi ,  Kazuhiko Takahashi ,  Yuji Aburakawa

IPC: G03H1/02 ,  G03B21/62 ,  G03B21/14 ,  G02B27/10 ,  G02B27/30 ,  G02B27/09

Abstract: Manufacturing methods are disclosed to produce a seamless hologram using a free-form-lens enabling arbitrary adjustment of diffraction angle and also a thick hologram made of transparent inorganic materials and heat and UV resistant is disclosed.

公开(公告)号：US11061224B2

公开(公告)日：2021-07-13

申请号：US15842774

申请日：2017-12-14

Applicant: Fusao Ishii ,  Mikiko Nakanishi ,  Kazuhiko Takahashi ,  Yuji Aburakawa ,  Keiichi Murakami

Inventor： Fusao Ishii ,  Mikiko Nakanishi ,  Kazuhiko Takahashi ,  Yuji Aburakawa ,  Keiichi Murakami

IPC: G02B27/00 ,  G02B27/01 ,  G02B27/30

Abstract: A see-through image display system having an Exit-Pupil-Expander (EPE) to enlarge the eyebox of display is disclosed. The EPE uses a hologram functioning as a micro-lens-array as well as collimation lens.