Patents by Inventor Katsumi Kurematsu
Katsumi Kurematsu 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: 8766897Abstract: A matrix substrate having plural switching elements provided in matrix corresponding to intersecting points of scanning lines and signal lines, plural picture element electrodes connected to the switching elements, and horizontal circuits and vertical circuits for inputting the signals to the switching elements comprises a horizontal scanning circuit for sampling a picture data based on digital picture signals, a latch circuit for memorizing the data synchronously with output from the horizontal scanning circuit, a D/A converter for converting the output from the latch circuit into analog signals, plural signal transfer switches provided between the D/A converter and the signal lines, and a selection circuit for selecting at least one of the signal transfer switches. A liquid crystal device comprises the matrix substrate, a counter substrate opposing to the matrix substrate and a liquid crystal material placed between the matrix substrate and the counter substrate.Type: GrantFiled: January 23, 2006Date of Patent: July 1, 2014Assignee: Canon Kabushiki KaishaInventors: Daisuke Yoshida, Katsumi Kurematsu, Osamu Koyama, Mamoru Miyawaki, Koichi Yamagishi
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Publication number: 20060132420Abstract: A matrix substrate having plural switching elements provided in matrix corresponding to intersecting points of scanning lines and signal lines, plural picture element electrodes connected to the switching elements, and horizontal circuits and vertical circuits for inputting the signals to the switching elements comprises a horizontal scanning circuit for sampling a picture data based on digital picture signals, a latch circuit for memorizing the data synchronously with output from the horizontal scanning circuit, a D/A converter for converting the output from the latch circuit into analog signals, plural signal transfer switches provided between the D/A converter and the signal lines, and a selection circuit for selecting at least one of the signal transfer switches. A liquid crystal device comprises the matrix substrate, a counter substrate opposing to the matrix substrate and a liquid crystal material placed between the matrix substrate and the counter substrate.Type: ApplicationFiled: January 23, 2006Publication date: June 22, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Daisuke Yoshida, Mamoru Miyawaki, Koichi Yamagishi, Katsumi Kurematsu, Osamu Koyama
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Patent number: 6994442Abstract: It is an object of this invention to provide a high-quality, high-precision, large-screen display apparatus which can obtain a sufficient light beam reception angle with respect to an image display unit, improve imaging performance, and obtain a thin structure. There is provided a display apparatus for obliquely projecting light from an image display unit onto a projection optical system, wherein the projection optical system includes a plurality of aspherical curved mirrors and projects an image without distortion (1.2% or less).Type: GrantFiled: March 15, 2005Date of Patent: February 7, 2006Assignee: Canon Kabushiki KaishaInventors: Katsumi Kurematsu, Toshihiro Sunaga
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Patent number: 6991338Abstract: A projection optical system having a plurality of reflecting surfaces is disclosed in which a sufficiently large angle is provided between an incident side reference axis and an emerging side reference axis while tilt angles of the respective reflecting surfaces can remain small. The projection optical system projects luminous flux from an image forming element which forms an original image onto a projection surface. The incident side reference axis and the emerging side reference axis of the projection optical system are oblique to each other. The projection optical system has a plurality of reflecting surfaces each having a curvature. The reflecting surfaces are arranged such that the reference axis has at least one intersection in the projection optical system.Type: GrantFiled: July 30, 2003Date of Patent: January 31, 2006Assignee: Canon Kabushiki KaishaInventors: Toshihiro Sunaga, Katsumi Kurematsu, Takayuki Ishii, Yoshiaki Kurioka, Sawako Chatani
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Patent number: 6984044Abstract: A projection optical system which can project a bright image with less distortion and a small projection distance without causing aberration or an increase in size of reflective surfaces is disclosed. The projection optical system projects luminous flux from an original image onto a projection surface which is oblique to a central principal ray which is a principal ray of luminous flux traveling from the center of the original image to the center of a projected image. The projection optical system comprises a refractive optical system which includes a plurality of refractive optical elements through which the luminous flux from the original image passes through, and a reflective optical system which includes a plurality of reflective surfaces each having an optical power and guides the luminous flux emerging from the refractive optical system to the projection surface.Type: GrantFiled: July 30, 2003Date of Patent: January 10, 2006Assignee: Canon Kabushiki KaishaInventors: Yoshiaki Kurioka, Katsumi Kurematsu, Takayuki Ishii, Toshihiro Sunaga, Sawako Chatani
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Patent number: 6951395Abstract: A projection optical system which has a short projection distance and a compact structure, and allows oblique projection. The projection optical system projects luminous flux from an image forming element for forming an original image onto a projection surface which is oblique to a central principal ray which is a principal ray of luminous flux traveling from the center of the original image to the center of a finally formed image. The system includes a plurality of reflecting surfaces each having a curvature. In addition, the projection optical system satisfies a predetermined expression (1).Type: GrantFiled: July 30, 2003Date of Patent: October 4, 2005Assignee: Canon Kabushiki KaishaInventors: Sawako Chatani, Katsumi Kurematsu, Takayuki Ishii, Toshihiro Sunaga, Yoshiaki Kurioka
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Patent number: 6927829Abstract: A matrix substrate having, on a substrate, a plurality of electroconductive members to constitute pixel electrodes arrayed in a matrix pattern and an electrically insulating member comprising a projecting region disposed between the electroconductive members to separate the pixel electrodes from each other. A metal material having a higher melting point than that of the electroconductive members is placed at the base of the projecting region.Type: GrantFiled: June 14, 2004Date of Patent: August 9, 2005Assignee: Canon Kabushiki KaishaInventors: Koichi Yamagishi, Katsumi Kurematsu, Osamu Koyama, Toru Nakazawa
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Patent number: 6923546Abstract: A projection type image display apparatus which keeps the uniformity of brightness and the feeling of sharpness and yet achieves a high quality of image called a high dynamic range is provided. When the amount of projection light is made small, the projection of unnecessary leak light or scattered light from a light modulating element P from a projection optical system PL1 is suppressed and a firm black display is provided. The amount of projection light is controlled in conformity with the maximum luminance level of an input image signal. Also, the write signal of the light modulating element is modulated in conformity with the control of the amount of projection light, whereby it becomes possible to expand the display dynamic range while compensating for the display luminance level.Type: GrantFiled: January 10, 2002Date of Patent: August 2, 2005Assignee: Canon Kabushiki KaishaInventor: Katsumi Kurematsu
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Publication number: 20050157412Abstract: It is an object of this invention to provide a high-quality, high-precision, large-screen display apparatus which can obtain a sufficient light beam reception angle with respect to an image display unit, improve imaging performance, and obtain a thin structure. There is provided a display apparatus for obliquely projecting light from an image display unit onto a projection optical system, wherein the projection optical system includes a plurality of aspherical curved mirrors and projects an image without distortion (1.2% or less).Type: ApplicationFiled: March 15, 2005Publication date: July 21, 2005Inventors: Katsumi Kurematsu, Toshihiro Sunaga
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Patent number: 6894842Abstract: The invention discloses a projection optical system for projecting an original image onto a projection surface. The projection optical system comprises a plurality of aspherical curved mirrors, which reflects image light from the original image in sequence and then forms an image on the projection surface. The projection optical system forms a projected image on the projection surface at an aspect ratio different from that of the original image by a combination of reflective actions of the image light on the aspherical surfaces of the plurality of aspherical curved mirrors. Even in a projection optical system having a wide angle of view and a short distance of projection, it is possible to implement a projection optical system that is capable of suppressing distortion and performing an optical aspect conversion.Type: GrantFiled: July 16, 2002Date of Patent: May 17, 2005Assignee: Canon Kabushiki KaishaInventors: Katsumi Kurematsu, Toshihiro Sunaga
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Patent number: 6883922Abstract: It is an object of this invention to provide a high-quality, high-precision, large-screen display apparatus which can obtain a sufficient light beam reception angle with respect to an image display unit, improve imaging performance, and obtain a thin structure. There is provided a display apparatus for obliquely projecting light from an image display unit onto a projection optical system, wherein the projection optical system includes a plurality of aspherical curved mirrors and projects an image without distortion (1.2% or less).Type: GrantFiled: August 8, 2001Date of Patent: April 26, 2005Assignee: Canon Kabushiki KaishaInventors: Katsumi Kurematsu, Toshihiro Sunaga
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Publication number: 20040233369Abstract: A matrix substrate having, on a substrate, a plurality of electroconductive members to constitute pixel electrodes arrayed in a matrix pattern, and an electrically insulating member comprising a projecting region disposed between the electroconductive members to separate the pixel electrodes from each other, wherein a metal material having a higher melting point than that of the electroconductive members is placed at the base of the projecting region.Type: ApplicationFiled: June 14, 2004Publication date: November 25, 2004Applicant: CANON KABUSHIKI KAISHAInventors: Koichi Yamagishi, Katsumi Kurematsu, Osamu Koyama, Toru Nakazawa
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Patent number: 6809790Abstract: A matrix substrate having, on a substrate, a plurality of electroconductive members to constitute pixel electrodes arrayed in a matrix pattern, and an electrically insulating member comprising a projecting region disposed between the electroconductive members to separate the pixel electrodes from each other, wherein a metal material having a higher melting point than that of the electroconductive members is placed at the base of the projecting region.Type: GrantFiled: May 13, 2002Date of Patent: October 26, 2004Assignee: Canon Kabushiki KaishaInventors: Koichi Yamagishi, Katsumi Kurematsu, Osamu Koyama, Toru Nakazawa
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Patent number: 6808271Abstract: In order to achieve a great improvement in light utilizing efficiency, a projection type display apparatus for obliquely projecting an original image onto a screen includes a first projection optical system for projecting light from an original picture and forming an intermediate image having trapezoid distortion caused therein, a second projection optical system for obliquely projecting the light from the intermediate image onto a surface for projection so as to cause converse trapezoid distortion, and re-imaging it, and a light deflecting element for deflecting the optical axis of the first projection optical system so that the optical axis of the first projection optical system deflected by the light deflecting element is made to substantially coincide with the optical axis of the second projection optical system.Type: GrantFiled: October 6, 2000Date of Patent: October 26, 2004Assignee: Canon Kabushiki KaishaInventor: Katsumi Kurematsu
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Patent number: 6712473Abstract: In order to provide a noise-free reliable projection type display apparatus which has no movable portion and can display a high quality full-color image, the following arrangement is proposed. In a projection type display apparatus which has an optical modulation device for displaying an image by controlling the reflected state of light, an illumination unit for irradiating the optical modulation device with light, and a projecting optical system for projecting reflected light components of the light components with which the optical modulation device is irradiated, and projects and displays an image formed by the optical modulation device, as the optical modulation device, a mirror array device for modulating light by controlling the tilt amounts of mirrors that form pixels is used.Type: GrantFiled: October 17, 2001Date of Patent: March 30, 2004Assignee: Canon Kabushiki KaishaInventor: Katsumi Kurematsu
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Publication number: 20040032571Abstract: A projection optical system having a plurality of reflecting surfaces is disclosed in which a sufficiently large angle is provided between an incident side reference axis and an emerging side reference axis while tilt angles of the respective reflecting surfaces can remain small. The projection optical system projects luminous flux from an image forming element which forms an original image onto a projection surface. The incident side reference axis and the emerging side reference axis of the projection optical system are oblique to each other. The projection optical system has a plurality of reflecting surfaces each having a curvature. The reflecting surfaces are arranged such that the reference axis has at least one intersection in the projection optical system.Type: ApplicationFiled: July 30, 2003Publication date: February 19, 2004Inventors: Toshihiro Sunaga, Katsumi Kurematsu, Takayuki Ishii, Yoshiaki Kurioka, Sawako Chatani
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Publication number: 20040027544Abstract: A projection optical system which has a short projection distance and a compact structure, and allows oblique projection. The projection optical system projects luminous flux from an image forming element for forming an original image onto a projection surface which is oblique to a central principal ray which is a principal ray of luminous flux traveling from the center of the original image to the center of a finally formed image. The system includes a plurality of reflecting surfaces each having a curvature. In addition, the projection optical system satisfies a predetermined expression (1).Type: ApplicationFiled: July 30, 2003Publication date: February 12, 2004Inventors: Sawako Chatani, Katsumi Kurematsu, Takayuki Ishii, Toshihiro Sunaga, Yoshiaki Kurioka
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Publication number: 20040027662Abstract: A projection optical system which can project a bright image with less distortion and a small projection distance without causing aberration or an increase in size of reflective surfaces is disclosed. The projection optical system projects luminous flux from an original image onto a projection surface which is oblique to a central principal ray which is a principal ray of luminous flux traveling from the center of the original image to the center of a projected image. The projection optical system comprises a refractive optical system which includes a plurality of refractive optical elements through which the luminous flux from the original image passes through, and a reflective optical system which includes a plurality of reflective surfaces each having an optical power and guides the luminous flux emerging from the refractive optical system to the projection surface.Type: ApplicationFiled: July 30, 2003Publication date: February 12, 2004Inventors: Yoshiaki Kurioka, Katsumi Kurematsu, Takayuki Ishii, Toshihiro Sunaga, Sawako Chatani
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Patent number: 6650460Abstract: The invention relates to a projection type display apparatus having an optical modulating device (3) controlling a light reflecting state by using a mirror array device, and a projecting optical system (4) projecting reflected light of light illuminated from the optical modulating device (3). In the apparatus, the mirror array device is illuminated by R, G and B color light components from different directions, and at least a part of the reflected light of the mirror array device is selectively guided to the projecting optical system (4) to project the light on to the screen or the like by controlling a tilt angle of the mirror array device.Type: GrantFiled: October 18, 2001Date of Patent: November 18, 2003Assignee: Canon Kabushiki KaishaInventor: Katsumi Kurematsu
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Patent number: 6592227Abstract: A projection type image-display apparatus includes a write signal processor for modulating the write signal transmitted to an optical modulator, a projected light quantity controlling for controlling the quantity of light transmitted or reflected by the optical modulator, and a control signal generator for controlling the write signal processor and the projected light quantity controller. The control signal generator is adapted to control the operation of controlling the quantity of projected light of the projected light quantity controller and that of modulating the write signal of the write signal processor on the basis of the brightness level of the input image signal.Type: GrantFiled: September 21, 2001Date of Patent: July 15, 2003Assignee: Canon Kabushiki KaishaInventors: Akihiro Ouchi, Katsumi Kurematsu, Yukihiko Sakashita