Patents by Inventor Tetsuro Yamazaki
Tetsuro Yamazaki 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: 11297290Abstract: A projector is provided that includes a light source configured to radiate light, an electro-optical panel including a pixel circuit configured to receive light from the light source and emit the light, and an optical axis shifting element configured to shift an optical axis of the light emitted from the pixel circuit, with the projector being configured to display a pixel on a projection surface, based on the light emitted from the pixel circuit via the optical axis shifting element. When shifting a position of the pixel on the projection surface from a first position to a second position in a first direction, the optical axis shifting element shifts an optical axis of the light emitted from the pixel circuit using a path different from a shortest path from the first position to the second position.Type: GrantFiled: November 4, 2019Date of Patent: April 5, 2022Assignee: SEIKO EPSON CORPORATIONInventors: Hiroyuki Hosaka, Tetsuro Yamazaki
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Publication number: 20200145627Abstract: A projector is provided that includes a light source configured to radiate light, an electro-optical panel including a pixel circuit configured to receive light from the light source and emit the light, and an optical axis shifting element configured to shift an optical axis of the light emitted from the pixel circuit, with the projector being configured to display a pixel on a projection surface, based on the light emitted from the pixel circuit via the optical axis shifting element. When shifting a position of the pixel on the projection surface from a first position to a second position in a first direction, the optical axis shifting element shifts an optical axis of the light emitted from the pixel circuit using a path different from a shortest path from the first position to the second position.Type: ApplicationFiled: November 4, 2019Publication date: May 7, 2020Applicant: SEIKO EPSON CORPORATIONInventors: Hiroyuki HOSAKA, Tetsuro YAMAZAKI
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Patent number: 10593244Abstract: An electro-optical device includes an optical path shift element that changes a path of light by a first and second period including ? SFs; a determining unit that determines whether or not a difference between a first gradation displayed for the first period and a second gradation displayed for the second period is larger than a threshold value; and a designation signal generating unit that generates a designation signal designating an on or off-state of the pixel for the SFs, in a case where a result of the determination is negative, the designation signal designates the on or off-state of the pixel so that the pixel displays a display gradation for the first and second period based on at least one of the first and second gradation, and each of the first, second, and display gradation is a gradation expressible by the on or off-state for the 2? SFs.Type: GrantFiled: June 7, 2018Date of Patent: March 17, 2020Assignee: SEIKO EPSON CORPORATIONInventor: Tetsuro Yamazaki
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Publication number: 20180374406Abstract: An electro-optical device includes an optical path shift element that changes a path of light by a first and second period including ? SFs; a determining unit that determines whether or not a difference between a first gradation displayed for the first period and a second gradation displayed for the second period is larger than a threshold value; and a designation signal generating unit that generates a designation signal designating an on or off-state of the pixel for the SFs, in a case where a result of the determination is negative, the designation signal designates the on or off-state of the pixel so that the pixel displays a display gradation for the first and second period based on at least one of the first and second gradation, and each of the first, second, and display gradation is a gradation expressible by the on or off-state for the 2? SFs.Type: ApplicationFiled: June 7, 2018Publication date: December 27, 2018Applicant: SEIKO EPSON CORPORATIONInventor: Tetsuro YAMAZAKI
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Patent number: 9389444Abstract: An electro-optical apparatus is provided with a pixel where first scanning line, first signal line, second scanning line, and second signal line are wired. The pixel includes a first transistor, a second transistor, a first pixel electrode, a second pixel electrode, and an electro-optical material, and the electro-optical material is interposed between the first pixel electrode and the second pixel electrode.Type: GrantFiled: December 9, 2014Date of Patent: July 12, 2016Assignee: SEIKO EPSON CORPORATIONInventor: Tetsuro Yamazaki
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Patent number: 9324255Abstract: An electro-optic device according an embodiment of the invention can increase the number of gray scales capable of being expressed. A liquid crystal panel is viewed via a blocking unit which blocks the field of view in a predetermined non-viewing period. A converting unit converts, based on a video signal, a gray-scale value input for each frame composed of a subfields into a subfield code indicating a combination of ON and OFF of b (2?b?a) subfields included in a viewing period other than the non-viewing period and c (1?c?b) subfields included in the non-viewing period. A driving unit drives a plurality of electro-optic elements each based on the converted subfield code.Type: GrantFiled: September 7, 2012Date of Patent: April 26, 2016Assignee: SEIKO EPSON CORPORATIONInventors: Tetsuro Yamazaki, Takashi Toyooka
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Publication number: 20160063930Abstract: The electro-optical device includes a first substrate, a second substrate, and an electro-optical material that is sandwiched between the first substrate and the second substrate. Pixel electrodes on the first substrate and pixel electrodes on the second substrate are arranged to coincide. The first substrate is driven by a first power supply, the second substrate is driven by a second power supply, and a potential of the first power supply and a potential of the second power supply are different from each other.Type: ApplicationFiled: August 5, 2015Publication date: March 3, 2016Inventors: Tetsuro Yamazaki, Mitsutoshi Miyasaka
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Publication number: 20150170588Abstract: An electro-optical apparatus is provided with a pixel where first scanning line, first signal line, second scanning line, and second signal line are wired. The pixel includes a first transistor, a second transistor, a first pixel electrode, a second pixel electrode, and an electro-optical material, and the electro-optical material is interposed between the first pixel electrode and the second pixel electrode.Type: ApplicationFiled: December 9, 2014Publication date: June 18, 2015Inventor: Tetsuro YAMAZAKI
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Patent number: 8872763Abstract: A position detecting system includes an indicating device including a photodiode that detects timing of a light pulse and a transmission unit that transmits a signal representing the timing, a plurality of light sources that emit light pulses to areas acquired by dividing a screen into a plurality of parts at timings unique to the light sources, a reception unit that receives the signal representing the timing, and a control unit that detects a position of the indicating device based on the signal representing the timing.Type: GrantFiled: January 16, 2012Date of Patent: October 28, 2014Assignee: Seiko Epson CorporationInventors: Takashi Toyooka, Tetsuro Yamazaki, Kazuhisa Mizusako
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Patent number: 8773479Abstract: An electro-optic device has electro-optic elements; a storage units storing a first table including pairs of a gray-scale value and an a-bit sub-field code and a second table including pairs of a gray-scale value and a b-bit (b>a) sub-field code; a converting unit converting the gray-scale value of an object pixel into the sub-field code using the second table when a difference in gray-scale value between a first image and a second image is less than a threshold value, while converting the gray-scale value of the object pixel into the sub-field code using the first table when the difference in gray-scale value between the first image and the second image is the threshold value or more; and a driving unit supplying a signal corresponding to the sub-field code converted by the converting unit to drive the electro-optic elements.Type: GrantFiled: August 27, 2012Date of Patent: July 8, 2014Assignee: Seiko Epson CorporationInventors: Takashi Nishimori, Tetsuro Yamazaki, Takashi Toyooka
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Patent number: 8669395Abstract: Provided is a new crystal A of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which is far better in stability, and a process for producing the crystal and a process for producing the crystal A comprising a step of heating the following crystal B in water having a pH of 3 to 9: crystal A: a crystal of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which has diffraction peaks within the range of a diffraction angle 2? of 8.7 to 9.4°, within that of 2? of 12.2 to 12.8°, and within that of 2? of 24.8 to 25.4° in a powder X-ray diffraction measurement of the crystal by use of the Cu—K? wavelength; and crystal B: a crystal of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which has diffraction peaks within the range of a diffraction angle 2? of 20.8 to 21.4°, within that of 2? of 26.7 to 27.3°, and within that of 2? of 29.7 to 30.3° in a powder X-ray diffraction measurement of the crystal by use of the Cu—K? wavelength.Type: GrantFiled: December 13, 2010Date of Patent: March 11, 2014Assignee: Sumitomo Chemical Company, LimitedInventors: Takashi Miki, Masahiro Takeda, Tetsuro Yamazaki
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Publication number: 20130093864Abstract: An electro-optic device according an embodiment of the invention can increase the number of gray scales capable of being expressed. A liquid crystal panel is viewed via a blocking unit which blocks the field of view in a predetermined non-viewing period. A converting unit converts, based on a video signal, a gray-scale value input for each frame composed of a subfields into a subfield code indicating a combination of ON and OFF of b (2?b?a) subfields included in a viewing period other than the non-viewing period and c (1?c?b) subfields included in the non-viewing period. A driving unit drives a plurality of electro-optic elements each based on the converted subfield code.Type: ApplicationFiled: September 7, 2012Publication date: April 18, 2013Applicant: SEIKO EPSON CORPORATIONInventors: Tetsuro YAMAZAKI, Takashi TOYOOKA
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Publication number: 20130069993Abstract: An electro-optic device has electro-optic elements; a storage units storing a first table including pairs of a gray-scale value and an a-bit sub-field code and a second table including pairs of a gray-scale value and a b-bit (b>a) sub-field code; a converting unit converting the gray-scale value of an object pixel into the sub-field code using the second table when a difference in gray-scale value between a first image and a second image is less than a threshold value, while converting the gray-scale value of the object pixel into the sub-field code using the first table when the difference in gray-scale value between the first image and the second image is the threshold value or more; and a driving unit supplying a signal corresponding to the sub-field code converted by the converting unit to drive the electro-optic elements.Type: ApplicationFiled: August 27, 2012Publication date: March 21, 2013Applicant: SEIKO EPSON CORPORATIONInventors: Takashi NISHIMORI, Tetsuro YAMAZAKI, Takashi TOYOOKA
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Patent number: 8384775Abstract: A scanning-type image display device includes: a light source section; a horizontal scanner; a vertical scanner; and a vertical scanner control section that controls the vertical scanner in such a manner that, when a second video signal is input, the vertical scanner control section controls the vertical scanner so as to perform vertical scanning with a scanning speed of vertical scanning which is higher than that of vertical scanning in the case of a first video signal being input, and after temporarily retuning a drawing position to an initial position within a time range from a point of time at which horizontal scanning of a current frame is completed to a start time of a next frame, the vertical scanner control section restarts the vertical scanning from the initial position in synchronization with a start timing of the next frame.Type: GrantFiled: August 8, 2007Date of Patent: February 26, 2013Assignee: Seiko Epson CorporationInventor: Tetsuro Yamazaki
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Publication number: 20120182214Abstract: A position detecting system includes an indicating device including a photodiode that detects timing of a light pulse and a transmission unit that transmits a signal representing the timing, a plurality of light sources that emit light pulses to areas acquired by dividing a screen into a plurality of parts at timings unique to the light sources, a reception unit that receives the signal representing the timing, and a control unit that detects a position of the indicating device based on the signal representing the timing.Type: ApplicationFiled: January 16, 2012Publication date: July 19, 2012Applicant: SEIKO EPSON CORPORATIONInventors: Takashi Toyooka, Tetsuro Yamazaki, Kazuhisa Mizusako
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Patent number: 8040332Abstract: A light scan device which forces a beam light depending on an image signal to scan, including: a light source part for supplying the beam light; and a scanning part for forcing the beam light from the light source part to scan an illumination-target region in a first direction and a second direction substantially orthogonal to the first direction, wherein the scanning part is driven so that a frequency with which the beam light is forced to scan in the first direction is higher than a frequency with which the beam light is forced to scan in the second direction, and a spot formed on the illumination-target region by the beam light has a form with a shorter size in the first direction than in the second direction.Type: GrantFiled: August 9, 2006Date of Patent: October 18, 2011Assignee: Seiko Epson CorporationInventors: Tetsuro Yamazaki, Takashi Takeda, Daisuke Uchikawa, Yasunaga Miyazawa
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Patent number: 7990598Abstract: A scan-type image display device which displays an image by scan of laser beam emitted from a light source in one direction and another direction of a light receiving surface includes: a first scan unit which performs scan of the laser beam in the one direction by deflecting the laser beam; a second scan unit which performs scan of the laser beam in the another direction by deflecting the laser beam; and a scan control unit which equalizes the scan width of the laser beam scan in the one direction by using the first scan unit performed at each position in the another direction within the light receiving surface.Type: GrantFiled: June 23, 2008Date of Patent: August 2, 2011Assignee: Seiko Epson CorporationInventor: Tetsuro Yamazaki
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Publication number: 20110152572Abstract: Provided is a new crystal A of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which is far better in stability, and a process for producing the crystal and a process for producing the crystal A comprising a step of heating the following crystal B in water having a pH of 3 to 9: crystal A: a crystal of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which has diffraction peaks within the range of a diffraction angle 2? of 8.7 to 9.4°, within that of 2? of 12.2 to 12.8°, and within that of 2? of 24.8 to 25.4° in a powder X-ray diffraction measurement of the crystal by use of the Cu—K? wavelength; and crystal B: a crystal of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which has diffraction peaks within the range of a diffraction angle 2? of 20.8 to 21.4°, within that of 2? of 26.7 to 27.3°, and within that of 2? of 29.7 to 30.3° in a powder X-ray diffraction measurement of the crystal by use of the Cu—K? wavelength.Type: ApplicationFiled: December 13, 2010Publication date: June 23, 2011Inventors: Takashi Miki, Masahiro Takeda, Tetsuro Yamazaki
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Patent number: 7914150Abstract: To reduce the color break-up and to provide high quality projection images. A method of driving a spatial light modulator, including generating a sub-frame pulse signal for a first colored light R1 through R8, B1 through B8, generating a sub-frame pulse signal for a second colored light G1 through G8, arranging the sub-frame pulse signals for the respective colored light so that at least three of the sub-frame pulse signals for the first colored light R1 through R8, B1 through B8 adjoin either one of the sub-frame pulse signals for the second colored light G1 through G8 during at least one frame of the image, and driving a plurality of movable mirror elements in accordance with the sub-frame pulse signals for the respective colored light arranged in arranging the sub-frame pulse signals, the movable mirror elements being alternatively moved at least to a first reflecting position and a second reflecting position.Type: GrantFiled: October 31, 2006Date of Patent: March 29, 2011Assignee: Seiko Epson CorporationInventors: Tetsuro Yamazaki, Hidehito Iisaka
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Patent number: 7692836Abstract: A scanning-type image display device includes: a light source section; a horizontal scanner; a vertical scanner, and a vertical scanner control section in such manner that, when a discrepancy occurs between a target scan line number and a scannable line number, and when a difference obtained by subtracting of the target scan line number from the scannable line number is a positive value, the vertical scanner control section controls the vertical scanner so as to put vertical scanning on standby within a time range from a point of time at which horizontal scanning is completed in a first frame to a point of time at which a horizontal scanning start signal corresponding to a vertical synchronizing signal of the video signal in a second frame is input, and restarts the vertical scanning in synchronization with an input timing of the horizontal scanning start signal.Type: GrantFiled: August 7, 2007Date of Patent: April 6, 2010Assignee: Seiko Epson CorporationInventor: Tetsuro Yamazaki