Patents by Inventor Takashi Takeda

Takashi Takeda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Virtual image display apparatus
    Patent number: 10502961
    Abstract: In a frame part, a center portion having a thick structure is provided between a first optical member as a first light guide unit and a second optical member as a second light guide unit to connect to both and fixes relative positions of the first optical member and the second optical member by the center portion, and thereby, reduction in weight and size of the frame part is realized.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: December 10, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Toshiaki Miyao, Takahiro Totani, Masayuki Takagi, Takashi Takeda, Akira Komatsu, Kazuya Kamakura
  • Image display device with optical systems to guide light to a pupil
    Patent number: 10495883
    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.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: December 3, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Osamu Yokoyama, Masatoshi Yonekubo, Takashi Takeda, Daisuke Ishida, Mitsutaka Ide, Hidemitsu Sorimachi
  • Virtual image display apparatus
    Patent number: 10481398
    Abstract: In an image generation unit, a light emitting part is formed using a self-emitting OLED device, and thereby, high-contrast images can be formed and the life of the light emitting part and the life of the virtual image display apparatus are extended. Even when the light emitted in the light emitting part has deviation in color balance, a half-mirror layer that has light transmissivity and realizes see-through vision is a reflection film having wavelength dependence, and thereby, a uniform color balance of image lights is achieved and images in good conditions are visually recognized.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: November 19, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Toshiaki Miyao, Takahiro Totani, Masayuki Takagi, Takashi Takeda, Akira Komatsu, Takeshi Koshihara, Kunihiko Yano
  • Image display device for changing focal point and convergence of display image
    Patent number: 10481686
    Abstract: An image display device includes: an image display section that displays an image for a user and allows the user to visually recognize external light; a line-of-sight direction and distance detecting section that detects a line-of-sight direction of the user and a distance to an object located in the line-of-sight direction; and a display control section that controls display operation of the image display section. The image display section includes a focal point and convergence changing section that changes a convergence and a focal point of a display image to be projected. The display control section controls the focal point and convergence changing section based on the line-of-sight direction and the distance to the object detected by the line-of-sight direction and distance detecting section.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: November 19, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Akira Komatsu, Takashi Takeda, Toshiaki Miyao, Masayuki Takagi
  • VIRTUAL IMAGE DISPLAY APPARATUS
    Publication number: 20190310543
    Abstract: Provided is a virtual image display apparatus including a laser light source, a scanner configured to scan light from the laser light source and render an intermediate image, a diffusion element arranged at a position of the intermediate image formed by the scanner, and an exit pupil forming unit configured to cause light that has passed through the diffusion element to be incident on a position of an exit pupil. The diffusion element separates the light from the scanner into first emission light used as a reference, and second emission light having a separation angle greater than a capturing angle corresponding to an inclination of light toward a predetermined pupil radius relative to the first emission light at an emission position of the light from the diffusion element, and then emits the first emission light and the second emission light.
    Type: Application
    Filed: April 5, 2019
    Publication date: October 10, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Akira KOMATSU, Masayuki TAKAGI, Toshiaki MIYAO, Takashi TAKEDA, Tokito YAMAGUCHI
  • VIRTUAL-IMAGE DISPLAY APPARATUS
    Publication number: 20190293940
    Abstract: Image formation is performed by using a synthesis optical system, and in a first dichroic film and a second dichroic film that are the synthesis surfaces in the synthesis optical system, a direction in which the cross axis that is the intersecting axis extends corresponds to a direction of alignment of eyes of an observer.
    Type: Application
    Filed: March 19, 2019
    Publication date: September 26, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Takashi TAKEDA, Mitsutaka IDE, Akira KOMATSU, Masayuki TAKAGI, Toshiaki MIYAO, Tokito YAMAGUCHI
  • Virtual image display apparatus
    Patent number: 10409070
    Abstract: A virtual image display apparatus includes an image projection apparatus that emits image light, and a display optical system that forms a virtual image according to the image light from a liquid crystal device (image forming device). The display optical system is configured by at least two members having different refractive indices and bends the image light a plurality of times between mediums having different refractive indices in a predetermined direction. A cumulative value of an index for chromatic dispersion with respect to the predetermined direction on a refractive surface of each bent portion is smaller than or equal to a predetermined reference value.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: September 10, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Akira Komatsu, Masayuki Takagi, Toshiaki Miyao, Takashi Takeda
  • Virtual image display apparatus
    Patent number: 10409075
    Abstract: A virtual image display apparatus includes a case member that stores a image element and is provided with a first end connected to other members, an optical component holding member with which an optical component guiding image light from the image element is assembled and that is provided with a second end connected to the first end, three or more protruding portions that are provided at one of the first end and the second end, have protrusion shapes, and extend toward the other end, three or more grooves that are provided at the other end, have depression shapes corresponding to the three or more protruding portions, and extend, and adhesive portions that fix the three or more protruding portions to the three or more grooves in a state in which the case member is aligned with the optical component holding member.
    Type: Grant
    Filed: May 23, 2018
    Date of Patent: September 10, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Masayuki Takagi, Toshiaki Miyao, Takashi Takeda, Akira Komatsu, Takuya Ikeda
  • Image display apparatus with light adjusting members
    Patent number: 10401626
    Abstract: An image display apparatus includes image displaying sections that present displayed images to a user and allow the user to visually recognize outside light, a first light adjusting member that is disposed on an outside-facing side of the image displaying sections and adjusts the transmittance based on outside light incident on the first light adjusting member, and a second light adjusting member that is disposed between the image displaying sections and the first light adjusting member and adjusts the transmittance in accordance with the transmittance of the first light adjusting member.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: September 3, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Masayuki Takagi, Takashi Takeda, Akira Komatsu, Toshiaki Miyao
  • VIRTUAL IMAGE DISPLAY DEVICE
    Publication number: 20190265494
    Abstract: A first lens and a second lens are bonded, and each of a light emitting plane and a light incident plane is a flat surface to shorten a configuration in an optical axis direction, and simultaneously, various optical elements such as a transmission/reflection selection member and the like can be mounted on a flat surface portion. Further, by providing a half mirror in a bonding portion between a convex surface and a concave surface to give power in folding an optical path, an image with a wide angle of view can be formed.
    Type: Application
    Filed: February 25, 2019
    Publication date: August 29, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Masayuki TAKAGI, Takashi TAKEDA, Akira KOMATSU, Toshiaki MIYAO, Tokito YAMAGUCHI
  • VIRTUAL IMAGE DISPLAY DEVICE
    Publication number: 20190265493
    Abstract: A first lens and a second lens are bonded to each other and configured to be short in an optical axis direction. Further, by providing a half mirror in a bonding portion between a convex surface and a concave surface, power is given when folding an optical path, and additionally, by setting a refractive index of the first lens larger than a refractive index of the second lens, an image with a wide angle of view can be formed.
    Type: Application
    Filed: February 25, 2019
    Publication date: August 29, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Masayuki TAKAGI, Takashi TAKEDA, Akira KOMATSU, Toshiaki MIYAO, Tokito YAMAGUCHI
  • Transmission-type display
    Patent number: 10397560
    Abstract: In first and second display devices that are provided in a pair on the left and right sides, image light and external light are superimposed on each other and viewed. In this case, a parallax of an angle (the value of angle) is set by a frame unit functioning as a parallax setting unit tilting principal rays of left and right image light inwardly, and the angle of convergence of an observer is in an appropriate state in the case of viewing the image light.
    Type: Grant
    Filed: April 7, 2016
    Date of Patent: August 27, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Toshiaki Miyao, Masayuki Takagi, Akira Komatsu, Takahiro Totani, Takashi Takeda
  • Virtual image display apparatus
    Patent number: 10394028
    Abstract: An apparatus has a see-through configuration that guides picture lights by a light guide device and superimposes lights from the outside world and the picture lights for visual recognition. The light guide device has a light guide prevention structure (light transmission prevention structure) provided in a narrow width shape part having a narrower shape than a surrounding part, and thereby, prevents unintended reflection or the like of lights due to the lights from the outside world and suppresses light guide of the lights toward an observer side.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: August 27, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Masayuki Takagi, Takahiro Totani, Toshiaki Miyao, Takashi Takeda, Akira Komatsu
  • Battery protection circuit, battery protection apparatus, and battery pack
    Patent number: 10355499
    Abstract: A battery protection circuit for protecting a secondary battery, the battery protection circuit not having a CPU, includes a non-volatile memory into which characteristics data determining protective characteristics of the battery protection circuit are writable; and a protection operation circuit which performs a protection operation of the secondary battery based on the characteristics data read out of the non-volatile memory.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: July 16, 2019
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Takashi Takeda, Ryota Kageyama, Koichi Murano, Junji Takeshita, Takeshi Yamaguchi, Takatoshi Itagaki, Koji Yano
  • DISPLAY DEVICE
    Publication number: 20190212562
    Abstract: A display device of the invention includes: an image generation part configured to generate image light; a light guide being configured to guide the image light; and an emitting part configured to cause the image light to emit from the light guide toward an exit pupil, in which the emitting part includes a plurality of half mirrors which are disposed parallel to one another at an interval, each of the plurality of half mirrors being configured to reflect a part of the image light and cause another part of the image light to pass through the half mirror, and in at least one half mirror of the plurality of half mirrors, when Bmax represents a maximum luminance, Bmin represents a minimum luminance, and a luminance ratio R (%) is defined as R=[(Bmax?Bmin)/Bmax]×100, R?30 is satisfied.
    Type: Application
    Filed: January 8, 2019
    Publication date: July 11, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hayato MATSUKI, Takashi TAKEDA, Shohei YOSHIDA
  • Production method for a bonded optical member and a virtual image display device
    Patent number: 10345597
    Abstract: By forming a hard coat layer on a bonding surface which is a surface of a bonding region between a first base material and a second base material, smoothing is achieved, and as a smoothing assisting treatment before forming the hard coat layer, the surfaces of the base materials are flattened by polishing on the bonding surface or a region corresponding to the bonding surface. By the synergistic effect of smoothing by formation of the hard coat layer and a flattening treatment by polishing as the smoothing assisting treatment, sufficient smoothing is achieved.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: July 9, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Toshiaki Miyao, Masayuki Takagi, Takashi Takeda, Akira Komatsu
  • LIGHT-GUIDING DEVICE AND DISPLAY DEVICE
    Publication number: 20190196199
    Abstract: A light-guiding device according to an aspect of the invention includes an incident section configured to make light incident, a light guide configured to guide the light incident from the incident section, a bonding layer configured to bond the incident section and the light guide, and a reflection member provided on a side surface of the bonding layer.
    Type: Application
    Filed: December 21, 2018
    Publication date: June 27, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hayato MATSUKI, Shohei YOSHIDA, Takashi TAKEDA
  • Image relay optical system and virtual image display device including the same
    Patent number: 10330934
    Abstract: An image relay optical system is provided with an optical coupling member before incidence of image light on a light guide member. Among a first light incident surface, a coupling member reflecting surface, and a first light emitting surface provided in the optical coupling member, the coupling member reflecting surface and the first light emitting surface are curved surfaces. Therefore, a large bright virtual image with reduced aberration can be displayed.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: June 25, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Takashi Takeda, Takahiro Totani, Akira Komatsu, Masayuki Takagi, Toshiaki Miyao
  • Virtual image display apparatus
    Patent number: 10310270
    Abstract: A light guide member includes three surfaces of a second surface, a fourth surface, and a fifth surface as two or more non-axisymmetric curved surfaces, and a projection lens includes a lens surface as a non-axisymmetric aspheric surface. With this, on the light guide member side, even when there is a shape constraint that the first surface or the third surface which is a surface contributing to light guide is a flat surface, and correction of asymmetric aberration is limited, it becomes possible to perform sufficient aberration correction as the whole of an optical system including the projection lens. Therefore, the virtual image display apparatus can have a wide viewing angle and high performance, and can be made small and lightweight.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: June 4, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Akira Komatsu, Takahiro Totani, Masayuki Takagi, Takashi Takeda, Toshiaki Miyao
  • Virtual image display apparatus including a diffraction optical member having a diffraction section and a light transmissive substrate
    Patent number: 10302949
    Abstract: A virtual image display apparatus includes a diffraction optical member including a diffraction section that directs the orientation of image light based on diffraction toward the position of a viewer's eye and a light transmissive substrate that is disposed in the diffraction section and on the side facing the eye and supports the diffraction section, and an image forming section that outputs the image light toward the diffraction optical member, and the light transmissive substrate is a color separation correcting section that corrects color separation produced by the diffraction section.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: May 28, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Takashi Takeda, Mitsutaka Ide