Patents by Inventor Motoo Takahashi
Motoo Takahashi 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).
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Patent number: 8684542Abstract: The invention provides a projection display that achieves continuous light amount control with ease and without causing unevenness of illumination of light applied to a light valve responsive to a video signal, thereby allowing constant image display with satisfactory contrast. The projection display of the invention includes a light valve (2); a light source (3a) generating light applied to the light valve (2); an integrator lens (4) provided on an optical path between the light source (3a) and the light valve (2) and making uniform the illumination distribution of light applied from the light source (3a) to the light valve (2); and a light amount control system (9) provided on the optical path and including a turning mechanism (9a) which turns like a set of double doors in order to adjust the amount of light applied from the light source (3a) to the light valve (2). The turning mechanism (9a) is bent into a V shape in a direction to reduce the amount of light (to block the light).Type: GrantFiled: September 22, 2011Date of Patent: April 1, 2014Assignee: Mitsubishi Electric CorporationInventors: Akihiro Yamada, Tomohiro Bessho, Akira Daijogo, Motoo Takahashi
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Patent number: 8162488Abstract: A projection display apparatus includes a light valve, a light source for producing light directed to the light valve, an integrator lens disposed in an optical path extending from the light source to the light valve and including a first lens array and a second lens array, and a light amount adjustment mechanism disposed in the optical path between the first lens array and the second lens array. The light amount adjusting mechanism includes a pair of light shielding elements pivoting in the form of a pair of double doors. The pair of light shielding elements have an opening formed in a region of tip portions thereof which corresponds to lens cells in contact with the optical axis of the second lens array. A region of the opening corresponding to one lens cell in contact with the optical axis of the second lens array is of a triangular configuration.Type: GrantFiled: July 16, 2009Date of Patent: April 24, 2012Assignee: Mitsubishi Electric CorporationInventors: Akihiro Yamada, Akira Daijogo, Motoo Takahashi, Kenji Samejima
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Publication number: 20120008107Abstract: The invention provides a projection display that achieves continuous light amount control with ease and without causing unevenness of illumination of light applied to a light valve responsive to a video signal, thereby allowing constant image display with satisfactory contrast. The projection display of the invention includes a light valve (2); a light source (3a) generating light applied to the light valve (2); an integrator lens (4) provided on an optical path between the light source (3a) and the light valve (2) and making uniform the illumination distribution of light applied from the light source (3a) to the light valve (2); and a light amount control system (9) provided on the optical path and including a turning mechanism (9a) which turns like a set of double doors in order to adjust the amount of light applied from the light source (3a) to the light valve (2). The turning mechanism (9a) is bent into a V shape in a direction to reduce the amount of light (to block the light).Type: ApplicationFiled: September 22, 2011Publication date: January 12, 2012Inventors: Akihiro YAMADA, Tomohiro BESSHO, Akira DAIJOGO, Motoo TAKAHASHI
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Patent number: 8052285Abstract: The invention provides a projection display that achieves continuous light amount control with ease and without causing unevenness of illumination of light applied to a light valve responsive to a video signal, thereby allowing constant image display with satisfactory contrast. The projection display of the invention includes a light valve (2); a light source (3a) generating light applied to the light valve (2); an integrator lens (4) provided on an optical path between the light source (3a) and the light valve (2) and making uniform the illumination distribution of light applied from the light source (3a) to the light valve (2); and a light amount control system (9) provided on the optical path and including a turning mechanism (9a) which turns like a set of double doors in order to adjust the amount of light applied from the light source (3a) to the light valve (2). The turning mechanism (9a) is bent into a V shape in a direction to reduce the amount of light (to block the light).Type: GrantFiled: May 16, 2008Date of Patent: November 8, 2011Assignee: Mitsubishi Electric CorporationInventors: Akihiro Yamada, Tomohiro Bessho, Akira Daijogo, Motoo Takahashi
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Patent number: 7993017Abstract: A projection display apparatus 101 in which the light quantity adjusting means has a simple and readily interchangeable structure, and which can improve image quality by adjusting the quantity of light received by a light valve continuously, without causing illuminance irregularities, and without having unwanted light radiated onto the screen, the light quantity adjusting means 9 having light blocking members 91L, 91R for blocking light in transit to a second lens array 22, and rotational axes 91LA, 91RA for turnably supporting each of the light blocking members on an xy plane, the light blocking members 91L, 91R and rotational axes 91LA, 91RA being positioned so that the rotational axes 91LA, 91RA are disposed in positions symmetric with respect to the optical axis AX on the xy plane, and the turning range from the light blocking initiation position at which the light blocking members 91L, 91R, by being turned, start to block light in transit toward the second lens array 22 to the maximum light blocking posiType: GrantFiled: October 29, 2007Date of Patent: August 9, 2011Assignee: Mitsubishi Electric CorporationInventors: Akihiro Yamada, Motoo Takahashi, Akira Daijogo, Tomohiro Bessho, Kenji Samejima
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Publication number: 20100165296Abstract: A projection display apparatus 101 in which the light quantity adjusting means has a simple and readily interchangeable structure, and which can improve image quality by adjusting the quantity of light received by a light valve continuously, without causing illuminance irregularities, and without having unwanted light radiated onto the screen, the light quantity adjusting means 9 having light blocking members 91L, 91R for blocking light in transit to a second lens array 22, and rotational axes 91LA, 91RA for turnably supporting each of the light blocking members on an xy plane, the light blocking members 91L, 91R and rotational axes 91LA, 91RA being positioned so that the rotational axes 91LA, 91RA are disposed in positions symmetric with respect to the optical axis AX on the xy plane, and the turning range from the light blocking initiation position at which the light blocking members 91L, 91R, by being turned, start to block light in transit toward the second lens array 22 to the maximum light blocking posiType: ApplicationFiled: October 29, 2007Publication date: July 1, 2010Inventors: Akihiro Yamada, Motoo Takahashi, Akira Daijogo, Tomohiro Bessho, Kenji Samejima
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Patent number: 7661829Abstract: A projection display apparatus is provided which offers improved contrast while smoothly controlling the amount of light, with a simple structure and without deterioration of lifetime due to the heat of the light from a light source. This projection display apparatus includes a light valve, a light source for emitting light to the light valve, an integrator lens disposed on the optical path of the light propagating from the light source to the light valve, for making uniform the illuminance distribution of the light from the light source, and a shutter mechanism disposed on the light path, for controlling the amount of light that illuminates the light valve.Type: GrantFiled: May 10, 2007Date of Patent: February 16, 2010Assignee: Mitsubishi Electric CorporationInventors: Akihiro Yamada, Yoshinori Sato, Akira Daijogo, Motoo Takahashi, Hiroshi Kida
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Publication number: 20080304022Abstract: The invention provides a projection display that achieves continuous light amount control with ease and without causing unevenness of illumination of light applied to a light valve responsive to a video signal, thereby allowing constant image display with satisfactory contrast. The projection display of the invention includes a light valve (2); a light source (3a) generating light applied to the light valve (2); an integrator lens (4) provided on an optical path between the light source (3a) and the light valve (2) and making uniform the illumination distribution of light applied from the light source (3a) to the light valve (2); and a light amount control system (9) provided on the optical path and including a turning mechanism (9a) which turns like a set of double doors in order to adjust the amount of light applied from the light source (3a) to the light valve (2). The turning mechanism (9a) is bent into a V shape in a direction to reduce the amount of light (to block the light).Type: ApplicationFiled: May 16, 2008Publication date: December 11, 2008Inventors: Akihiro Yamada, Tomohiro Bessho, Akira Daijogo, Motoo Takahashi
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Publication number: 20080043312Abstract: A projection display apparatus is provided which offers improved contrast while smoothly controlling the amount of light, with a simple structure and without deterioration of lifetime due to the heat of the light from a light source. This projection display apparatus includes a light valve, a light source for emitting light to the light valve, an integrator lens disposed on the optical path of the light propagating from the light source to the light valve, for making uniform the illuminance distribution of the light from the light source, and a shutter mechanism disposed on the light path, for controlling the amount of light that illuminates the light valve.Type: ApplicationFiled: May 10, 2007Publication date: February 21, 2008Inventors: Akihiro Yamada, Yoshinori Sato, Akira Daijogo, Motoo Takahashi, Hiroshi Kida
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Patent number: 7163298Abstract: The invention provides a lens device of a projector for projecting light that has been modulated and emitted by a display device, wherein said lens device has an optical axis and is arranged telecentric to rays of light emitted from said display device, said lens device has a diaphragm mechanism having an aperture at such a position that the lens device causes principal rays emitted from various locations on the display device to intersect with the optical axis, and said aperture is substantially trapezoidal.Type: GrantFiled: January 11, 2006Date of Patent: January 16, 2007Assignees: Chinon Tec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima
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Patent number: 7114815Abstract: The invention provides A lens device of a projector for projecting light that has been modulated and emitted by a display device, wherein said lens device has an optical axis and is arranged telecentric to rays of light emitted from said display device, said lens device has a diaphragm mechanism having an aperture at such a position that the lens device causes principal rays emitted from various locations on the display device to intersect with the optical axis; and said aperture is shaped such that sides of the aperture curve inward approximately along lines that connect areas having substantially similar levels of contrast.Type: GrantFiled: January 12, 2006Date of Patent: October 3, 2006Assignees: Chinontec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima
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Patent number: 7114814Abstract: The invention provides a projector having a light source, a display device to modulate light emitted from the light source, a lens device to project light emitted from the light source via the display device, wherein the lens device has a diaphragm mechanism formed having an aperture, an ambient light illuminance detector to measure illuminance of ambient light, a projected image illuminance detector to measure illuminance of an image projected on the screen, an illuminance comparator to compare an illuminance detected by the ambient light illuminance detector and an illuminance detected by the projected image illuminance detector, and a diaphragm mechanism/image signal controller to control an intensity of image signals input into the display device and to control a size of an opening of the aperture of the diaphragm mechanism in accordance with a result of comparison by the illuminance comparator.Type: GrantFiled: January 10, 2006Date of Patent: October 3, 2006Assignees: Chinontec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima
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Patent number: 7111946Abstract: The invention provides a lens device of a projector for projecting light that has been modulated and emitted by a display device, wherein said lens device has an optical axis and is arranged telecentric to rays of light emitted from said display device, said lens device has a diaphragm mechanism having an aperture at such a position that the lens device causes principal rays emitted from various locations on the display device to intersect with the optical axis, and said aperture is substantially triangular.Type: GrantFiled: January 11, 2006Date of Patent: September 26, 2006Assignees: Chinon Tec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima
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Patent number: 7111947Abstract: The invention provides a lens device of a projector for projecting light that has been modulated and emitted by a display device, wherein said lens device has an optical axis and is arranged telecentric to rays of light emitted from said display device, said lens device has a diaphragm mechanism having an aperture at such a position that the lens device causes principal rays emitted from various locations on the display device to intersect with the optical axis, and said aperture is substantially square.Type: GrantFiled: January 13, 2006Date of Patent: September 26, 2006Assignees: Chinontec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima
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Patent number: 7104655Abstract: The invention provides a projector having a light source, a display device to modulate light emitted from the light source, a lens device to project light emitted from the light source and modulated by the display device, wherein the lens device comprises a diaphragm mechanism, an image signal intensity detector to detect image signals input into the display device and to evaluate an intensity of the signals, a diaphragm mechanism drive control to drive the diaphragm mechanism so as to reduce the size of an aperture of the diaphragm mechanism when the image signal intensity detector ascertains that the intensity of the image signal is lower than a given level, and an image signal controller to increase the intensity of the image signal when the image signal intensity detector ascertains that the intensity of the image signal is lower than a given level.Type: GrantFiled: January 6, 2006Date of Patent: September 12, 2006Assignees: Chinontec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima
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Publication number: 20060119803Abstract: The invention provides a projector having a light source, a display device to modulate light emitted from the light source, a lens device to project light emitted from said light source via said display device, wherein the lens device has a diaphragm mechanism that is formed having an aperture, an object detector to detect an object between the lens device and the screen, and a diaphragm mechanism drive control to drive the diaphragm mechanism so as to reduce a size of an opening of the aperture of the diaphragm mechanism when the object detector detects an object between the lens device and the screen.Type: ApplicationFiled: January 9, 2006Publication date: June 8, 2006Applicants: Chinon Tec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima
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Publication number: 20060114425Abstract: The invention provides a lens device of a projector for projecting light that has been modulated and emitted by a display device, wherein said lens device has an optical axis and is arranged telecentric to rays of light emitted from said display device, said lens device has a diaphragm mechanism having an aperture at such a position that the lens device causes principal rays emitted from various locations on the display device to intersect with the optical axis, and said aperture is substantially trapezoidal.Type: ApplicationFiled: January 11, 2006Publication date: June 1, 2006Applicants: Chinon Tec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima
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Publication number: 20060114428Abstract: The invention provides a lens device of a projector for projecting light that has been modulated and emitted by a display device, wherein said lens device has an optical axis and is arranged telecentric to rays of light emitted from said display device, said lens device has a diaphragm mechanism having an aperture at such a position that the lens device causes principal rays emitted from various locations on the display device to intersect with the optical axis, and said aperture is substantially square.Type: ApplicationFiled: January 13, 2006Publication date: June 1, 2006Applicants: Chinon Tec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima
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Publication number: 20060114427Abstract: The invention provides A lens device of a projector for projecting light that has been modulated and emitted by a display device, wherein said lens device has an optical axis and is arranged telecentric to rays of light emitted from said display device, said lens device has a diaphragm mechanism having an aperture at such a position that the lens device causes principal rays emitted from various locations on the display device to intersect with the optical axis; and said aperture is shaped such that sides of the aperture curve inward approximately along lines that connect areas having substantially similar levels of contrast.Type: ApplicationFiled: January 12, 2006Publication date: June 1, 2006Applicants: Chinon Tec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima
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Publication number: 20060114426Abstract: The invention provides a lens device of a projector for projecting light that has been modulated and emitted by a display device, wherein said lens device has an optical axis and is arranged telecentric to rays of light emitted from said display device, said lens device has a diaphragm mechanism having an aperture at such a position that the lens device causes principal rays emitted from various locations on the display device to intersect with the optical axis, and said aperture is substantially triangular.Type: ApplicationFiled: January 11, 2006Publication date: June 1, 2006Applicants: Chinon Tec Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hiroki Abe, Tomoo Fujimori, Motoo Takahashi, Kenji Samejima