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).
-
Patent number: 11048084Abstract: In a first display device and a second display device of a display mechanism, a first video image and a second video image having mutually different display contents are visually recognized, and further, display positions of the first video image and the second video image can be changed by first and second posture adjustment mechanisms that are a posture adjustment mechanism.Type: GrantFiled: December 26, 2019Date of Patent: June 29, 2021Assignee: SEIKO EPSON CORPORATIONInventors: Takashi Takeda, Toshiyuki Kasai
-
Publication number: 20210165227Abstract: A panel unit configured to, for imaging light, use different opening ratios depending on a wavelength band for displaying an image, a yellowing optical member that is disposed on an optical path of imaging light emitted from the panel unit, and turns yellow with age, a yellowing degree estimation unit configured to estimate, by prediction, a yellowing degree of the yellowing optical member with age, and a luminance adjustment unit configured to, depending on yellowing of the yellowing optical member, based on data of the yellowing degree estimation unit, adjust luminance of an image in the panel unit, are provided.Type: ApplicationFiled: November 27, 2020Publication date: June 3, 2021Applicant: SEIKO EPSON CORPORATIONInventors: Tokito YAMAGUCHI, Masayuki TAKAGI, Toshiaki MIYAO, Akira KOMATSU, Takashi TAKEDA
-
Patent number: 11025894Abstract: In a left and right pair of a first display device and a second display device that perform repositionable display, mutually different display contents can be visually recognized as a first video image and a second video image. Further, a display control portion controls the display content in accordance with at least one of the first video image and the second video image.Type: GrantFiled: December 27, 2019Date of Patent: June 1, 2021Assignee: SEIKO EPSON CORPORATIONInventors: Takashi Takeda, Toshiyuki Kasai, Masayuki Takagi, Toshiaki Miyao, Tokito Yamaguchi
-
Publication number: 20210132392Abstract: A display element, and a light-guiding member including a plurality of reflection surfaces and configured to guide image light from the display element by reflecting the image light at an inner surface, and cause the image light and external light to be visually recognized in an overlapping manner are provided, wherein at a boundary between a first reflection surface and a second reflection surface adjacent to each other included in the plurality of reflection surfaces of the light-guiding member with at least one of the first reflection surface and the second reflection surface including a curved surface, an end of the first reflection surface and an end of the second reflection surface match when projected from a specific direction.Type: ApplicationFiled: October 29, 2020Publication date: May 6, 2021Applicant: SEIKO EPSON CORPORATIONInventors: Masayuki TAKAGI, Tokito YAMAGUCHI, Toshiaki MIYAO, Takashi TAKEDA
-
Publication number: 20210132388Abstract: A head-mounted display includes an image display device including a panel unit serving as a display element configured to display an image, a colored optical member disposed on a light path of imaging light emitted from the panel unit and having a yellowness of a predetermined value or greater, and a coloring correction optical member configured to correct a degree of coloring of the imaging light of the entire light path in accordance with the yellowness of the colored optical member.Type: ApplicationFiled: October 27, 2020Publication date: May 6, 2021Applicant: SEIKO EPSON CORPORATIONInventors: Tokito YAMAGUCHI, Masayuki TAKAGI, Toshiaki MIYAO, Akira KOMATSU, Takashi TAKEDA
-
Publication number: 20210132389Abstract: A light-guiding device is configured to accept image light through a light incidence part, guide the image light through reflection, and emit, to outside through a light emission part, the image light that is guided, the light-guiding device includes a protective member having a sheet shape and configured to cover a body member in a region corresponding to an optical surface of a surface of the light-guiding device, and an adhesive layer is formed between the body member and the protective member.Type: ApplicationFiled: October 28, 2020Publication date: May 6, 2021Applicant: SEIKO EPSON CORPORATIONInventors: Toshiaki MIYAO, Masayuki TAKAGI, Tokito YAMAGUCHI, Takashi TAKEDA
-
Publication number: 20210119274Abstract: A secondary battery protection circuit for controlling charge and discharge using a switching circuit to protect a secondary battery from temperature is provided. The switching circuit is configured to be provided in a charge-and-discharge path between the secondary battery and an external device. The secondary battery protection circuit includes a detection terminal configured to be electrically connected, via a resistor, to between the switching circuit and the external device. The secondary battery protection circuit includes a first terminal configured to be electrically connected to a temperature detection terminal of the external device. The secondary battery protection circuit includes a second terminal to which a temperature sensitive element is configured to be electrically connected, the temperature sensitive element having a characteristic value varying in accordance with a change in temperature of the secondary battery.Type: ApplicationFiled: October 13, 2020Publication date: April 22, 2021Applicant: MITSUMI ELECTRIC CO., LTD.Inventors: Yohei WATANABE, Takashi TAKEDA, Junji TAKESHITA, Daisuke SUZUKI
-
Patent number: 10968387Abstract: A phosphor, combined with LED having not exceeding 470 nm, of high emission intensity and with chemical and thermal stability is provided. The phosphor according to the present invention comprises an inorganic compound in which element A (A is one or two or more kinds of elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, and Yb) is solid solved in an inorganic crystal including at least metal element M and non-metal element X and represented by MnXn+1 (3?n?52), an inorganic crystal having the same crystal structure, or an inorganic crystal including a solid solution thereof. Here, M comprises at least Al and Si, and if necessary element L (L is a metal element other than Al and Si) and X comprises N, O if necessary, and element Z if necessary (Z is a non-metal element other than N and O).Type: GrantFiled: March 27, 2017Date of Patent: April 6, 2021Assignee: National Institute for Materials ScienceInventors: Naoto Hirosaki, Yuichi Michiue, Shiro Funahashi, Takashi Takeda
-
Publication number: 20210096377Abstract: A head-mounted display includes a display device configured to display an image, a diopter adjustment device configured to adjust a diopter, and a correction processing circuit serving as an image correction device configured to correct a display image in accordance with a degree of diopter adjustment. In the adjustments made on a left side and a right side, respectively, after diopter adjustment, the display image is corrected in accordance with the degree of diopter adjustment.Type: ApplicationFiled: September 29, 2020Publication date: April 1, 2021Applicant: SEIKO EPSON CORPORATIONInventors: Masayuki TAKAGI, Akira KOMATSU, Takashi TAKEDA, Toshiaki MIYAO, Tokito YAMAGUCHI
-
Patent number: 10942431Abstract: 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: GrantFiled: April 5, 2019Date of Patent: March 9, 2021Assignee: SEIKO EPSON CORPORATIONInventors: Akira Komatsu, Masayuki Takagi, Toshiaki Miyao, Takashi Takeda, Tokito Yamaguchi
-
Publication number: 20210063752Abstract: A virtual image display apparatus includes a display element, an optical element configured to pass therethrough image light emitted from the display element, a reflecting mirror configured to reflect the image light emitted from the optical element, a see-through hologram mirror of a see-through type configured to reflect the image light, emitted from the reflecting mirror, to a pupil position, and a linear diffraction element of a transmissive type arranged on an optical path from the optical element to the hologram mirror. The optical element, the reflecting mirror, and the see-through hologram mirror are arranged to form an off-axis system, and the linear diffraction element compensates wavelength dispersion caused by the see-through hologram mirror at an off-axis surface of the off-axis system.Type: ApplicationFiled: August 27, 2020Publication date: March 4, 2021Applicant: SEIKO EPSON CORPORATIONInventors: Takashi TAKEDA, Masayuki TAKAGI, Toshiaki MIYAO, Tokito YAMAGUCHI, Mitsutaka IDE
-
Publication number: 20210063749Abstract: A virtual image display apparatus includes a display element, a projection lens configured to converge image light emitted from the display element, a prism configured to cause the image light by an internal reflecting surface thereof and moreover emit the image light from an emission surface thereof while refracting the image light, and a see-through mirror configured to reflect the image light emitted from the prism toward a pupil position. The projection lens, the prism, and the see-through mirror are arranged to form an off-axis system. AT an off-axis surface of the off-axis system, an intermediate pupil is arranged between the projection lens and the internal reflecting surface, with the intermediate pupil being arranged to be farther to the incident surface sidfe of the prism than to the projection lens and the internal reflecting surface, and an intermediate image is formed between the prism and the see-through mirror.Type: ApplicationFiled: August 27, 2020Publication date: March 4, 2021Applicant: SEIKO EPSON CORPORATIONInventors: Takashi TAKEDA, Masayuki TAKAGI, Toshiaki MIYAO, Tokito YAMAGUCHI
-
Patent number: 10884254Abstract: An image display device includes a plurality of display elements configured to emit image light corresponding to a plurality of separate areas, and an ocular optical system configured to emit, to a position corresponding to an eye of an observer, the image light emitted from the plurality of display elements. The ocular optical system causes images to overlap with each other in a blending area including a boundary between the plurality of areas. An overlapping angle width in a direction orthogonal to the boundary of the blending area on a central visual field side is smaller than an overlapping angle width in the direction orthogonal to the boundary of the blending area on a peripheral visual field side.Type: GrantFiled: October 17, 2018Date of Patent: January 5, 2021Assignee: SEIKO EPSON CORPORATIONInventors: Tokito Yamaguchi, Masayuki Takagi, Toshiaki Miyao, Akira Komatsu, Takashi Takeda
-
Patent number: 10871650Abstract: A light guide system includes a transparent light guide portion that guides light beams incident from one end side to a light-emitting portion. The light guide portion includes a plurality of partial reflection surfaces that are disposed between a first surface and a second surface which are parallel to each other and are inclined at the same angle such that a first end portion is positioned closer to the one end side than a second end portion is. Intervals between the partial reflection surfaces in a first direction are widened from the one end side toward another end side. In a state where the light guide portion is disposed in front of an eye of an observer, the light guide portion is inclined such that the another end side is further away from a face of the observer than the one end side is.Type: GrantFiled: March 16, 2018Date of Patent: December 22, 2020Assignee: SEIKO EPSON CORPORATIONInventors: Hayato Matsuki, Takashi Takeda, Shohei Yoshida
-
Patent number: 10873742Abstract: In a head mounted display, an image is displayed with central resolution higher than peripheral resolution or the peripheral resolution is not necessarily high resolution, and a controller changes the display aspect of the image formed by an image formation apparatus in accordance with a change in the sightline detected with a sightline sensor.Type: GrantFiled: February 20, 2018Date of Patent: December 22, 2020Assignee: SEIKO EPSON CORPORATIONInventors: Takashi Takeda, Akira Komatsu, Masayuki Takagi, Toshiaki Miyao
-
Patent number: 10859836Abstract: A head-mounted display includes a display device, a projection optical member, and a prism member. The prism member includes a first prism receiving image light from the projection optical member, and a second prism disposed at a position further toward an exit pupil than the first prism. The first prism includes an entrance surface, a first reflection surface, and a first joining surface, the second prism includes a second joining surface joined to the first joining surface via a semi-transmissive reflection surface, a second reflection surface, and a light collecting reflection surface, and the semi-transmissive reflection surface is configured to reflect the image light, reflected by the light collecting reflection surface and then totally reflected by the second reflection surface, to pass through the second reflection surface.Type: GrantFiled: July 9, 2019Date of Patent: December 8, 2020Assignee: SEIKO EPSON CORPORATIONInventors: Akira Komatsu, Masayuki Takagi, Toshiaki Miyao, Takashi Takeda, Tokito Yamaguchi
-
Publication number: 20200381917Abstract: A secondary battery protection circuit for protecting a secondary battery, including: a low-voltage detecting circuit configured to detect a voltage across the secondary battery that is lower than a second voltage for low voltage detection, the second voltage being set to be lower than a first voltage for overdischarge detection; and a switching circuit configured to cause a gate of a charge control NMOS transistor to be fixed at a potential at a high side power supply terminal, upon detecting, by the low-voltage detecting circuit, that the voltage across the secondary battery is lower than the second voltage for low voltage detection.Type: ApplicationFiled: May 22, 2020Publication date: December 3, 2020Applicant: MITSUMI ELECTRIC CO., LTD.Inventor: Takashi TAKEDA
-
Patent number: 10852555Abstract: A head-mounted display apparatus according to the present disclosure includes an image generating module, a first deflecting element including a first deflecting portion configured to deflect, along a second optical axis intersecting the first optical axis, imaging light from the image generating module, and a second deflecting portion configured to deflect the imaging light along a third optical axis, a first diffraction element configured to diffract the imaging light from the second deflecting portion, and a second diffraction element configured to diffract the imaging light from the first diffraction element. A distance along the first optical axis between the image generating module and the first deflecting portion is longer than a distance along the third optical axis between the first diffraction element and the second deflecting portion.Type: GrantFiled: October 29, 2019Date of Patent: December 1, 2020Assignee: SEIKO EPSON CORPORATIONInventors: Takashi Takeda, Takeshi Koshihara, Masatoshi Yonekubo, Mitsutaka Ide
-
Patent number: 10852543Abstract: Light guide system includes transparent light guide section that leads light inputted through one end portion, to an output section. The light guide section includes a plurality of partial reflection planes, each inclined at a same angle such that a first end portion is located on the side of the one end portion, with respect to a second end portion, and aligned between a first plane and a second plane parallel to each other. Pitches among the partial reflection planes in a first direction are widened toward another end portion, from the side of the one end portion. From an eye of a viewer, a wide overlapping portion is non-existent between two partial reflection planes adjacent to each other on the side of the another end portion, and a wide gap is non-existent between two partial reflection planes adjacent to each other on the side of the one end portion.Type: GrantFiled: March 16, 2018Date of Patent: December 1, 2020Assignee: SEIKO EPSON CORPORATIONInventors: Hayato Matsuki, Takashi Takeda
-
Patent number: 10831026Abstract: A retina scanning type display apparatus includes a scanning portion, a deflection member, and a light flux diameter expanding element. An incidence angle range in a first incidence direction with respect to an eye from the deflection member is broader than an incidence angle range in a second incidence direction, and, in the light flux diameter expanding element, an expanding magnification of light flux diameter in a first expanding direction, which corresponds to the first incidence direction, is greater than an expanding magnification of light flux diameter in a second expanding direction, which corresponds to the second incidence direction. In addition, in the scanning mirror, a width in a first scanning direction, which corresponds to the first expanding direction, is narrower than a width in a second scanning direction, which corresponds to the second expanding direction.Type: GrantFiled: October 26, 2015Date of Patent: November 10, 2020Assignee: SEIKO EPSON CORPORATIONInventor: Takashi Takeda