Patents by Inventor Toshifumi Yokoyama
Toshifumi Yokoyama 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: 10734433Abstract: A solid state imaging device has a global shutter structure and includes: a photodetector; a wiring layer; a first transparent insulating film disposed immediately above the photodetector and penetrating the wiring layer; a transparent protective film covering the wiring layer and the first transparent insulating film, and having a higher refractive index than the first transparent insulating film; a first projection provided on the transparent protective film and having a quadrilateral shape in top view; and a second transparent insulating film having a lower refractive index than the first projection.Type: GrantFiled: July 25, 2018Date of Patent: August 4, 2020Assignee: TowerJazz Panasonic Semiconductor Co., Ltd.Inventors: Toshifumi Yokoyama, Yoshiaki Nishi, Masakatsu Suzuki, Hiroshi Masuda
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Publication number: 20180331148Abstract: A solid state imaging device has a global shutter structure and includes: a photodetector; a wiring layer; a first transparent insulating film disposed immediately above the photodetector and penetrating the wiring layer; a transparent protective film covering the wiring layer and the first transparent insulating film, and having a higher refractive index than the first transparent insulating film; a first projection provided on the transparent protective film and having a quadrilateral shape in top view; and a second transparent insulating film having a lower refractive index than the first projection.Type: ApplicationFiled: July 25, 2018Publication date: November 15, 2018Inventors: Toshifumi YOKOYAMA, Yoshiaki NISHI, Masakatsu SUZUKI, Hiroshi MASUDA
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Patent number: 9485172Abstract: A data transmitting device coupling to a plurality of nodes in a network includes a plurality of communication paths, the data transmitting device includes a memory and a processor coupled to the memory configured to set a routing table based on a command that designates a first communication path included in the plurality of communication paths, to detect a link failure occurred in the network, and when the link failure has occurred at a first location between the data transmitting device and a first node adjacent to the data transmitting device on the first communication path, to modify the routing table so that data are to be transmitted to a second node on a second communication path different from the first communication path, and when the link failure has occurred at a second location that differs from the first location in the network, to maintain the routing table.Type: GrantFiled: April 23, 2014Date of Patent: November 1, 2016Assignee: FUJITSU LIMITEDInventors: Masahiro Yoshimoto, Nobuhiro Rikitake, Toshifumi Yokoyama
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Publication number: 20140347975Abstract: A data transmitting device coupling to a plurality of nodes in a network includes a plurality of communication paths, the data transmitting device includes a memory and a processor coupled to the memory configured to set a routing table based on a command that designates a first communication path included in the plurality of communication paths, to detect a link failure occurred in the network, and when the link failure has occurred at a first location between the data transmitting device and a first node adjacent to the data transmitting device on the first communication path, to modify the routing table so that data are to be transmitted to a second node on a second communication path different from the first communication path, and when the link failure has occurred at a second location that differs from the first location in the network, to maintain the routing table.Type: ApplicationFiled: April 23, 2014Publication date: November 27, 2014Applicant: FUJITSU LIMITEDInventors: Masahiro YOSHIMOTO, Nobuhiro Rikitake, TOSHIFUMI YOKOYAMA
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Patent number: 8440951Abstract: A wavelength conversion laser light source includes: a fundamental light source for outputting fundamental light; a wavelength conversion element with a nonlinear optical effect for converting the fundamental light into harmonic light of a different wavelength; a first optical receiver for receiving light of a specific polarization direction contained in the fundamental light output from the fundamental light source and converting an amount of light thereof into an electrical signal; a second optical receiver for receiving the harmonic light output from the wavelength conversion element and converting an amount of light thereof into an electrical signal; a temperature holding unit for holding a temperature of the wavelength conversion element constant; a fundamental light control unit for performing first control of controlling an amount of light of the fundamental light output from the fundamental light source based on the electrical signal from the second optical receiver, and second control of controllingType: GrantFiled: July 8, 2009Date of Patent: May 14, 2013Assignee: Panasonic CorporationInventors: Hiroyuki Furuya, Koichi Kusukame, Tetsuro Mizushima, Toshifumi Yokoyama, Kenji Nakayama, Kazuhisa Yamamoto, Shinichi Kadowaki, Tomoya Sugita, Nobuyuki Horikawa
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Patent number: 8350789Abstract: A 2D image display apparatus using a laser light source. By controlling the timing of a scan by a beam scan portion in response to the characteristic of a laser light source and by setting a light emitting time of the laser light source to an integral multiple of a scan cycle of the beam scan portion, it is possible to illuminate a spatial light modulator homogeneously with a laser beam. It is thus possible to display an image at high accuracy without causing a bright line, irregularities in brightness, and contrast deterioration.Type: GrantFiled: April 11, 2007Date of Patent: January 8, 2013Assignee: Panasonic CorporationInventors: Hiroyuki Furuya, Kiminori Mizuuchi, Toshifumi Yokoyama, Tatsuo Itoh, Akira Kurozuka, Kazuhisa Yamamoto
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Patent number: 8287131Abstract: A wavelength conversion laser is provided with a solid-state laser having a cavity, and a wavelength converting element arranged within the cavity. The solid-state laser includes two or more types of laser crystals and oscillates solid-state laser light of multiple wavelengths. The wavelength converting element converts the solid-state laser light of multiple wavelengths into light of second harmonic waves and sum-frequency wave of multiple wavelengths and simultaneously generates the second harmonic waves and sum-frequency wave of multiple wavelengths. The wavelength conversion laser outputs converted wavelength light having a broad spectral width and low coherency, thereby enabling it to carry out highly efficient and stable high-output oscillation.Type: GrantFiled: November 25, 2008Date of Patent: October 16, 2012Assignee: Panasonic CorporationInventors: Tetsuro Mizushima, Toshifumi Yokoyama, Tatsuo Itoh, Kenji Nakayama, Kiminori Mizuuchi, Kazuhisa Yamamoto
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Patent number: 8152314Abstract: A display device (100) of the present invention has a first switch (3) and a second switch (4) on an upper surface of its casing, and includes a control circuit (18) for controlling the first switch (3) and the second switch (4) and a light source (19) inside the casing. The control circuit (18) performs control so that the light source (19) is turned on when the second switch (4) is pressed after a predetermined period of time has passed from when the first switch (3) was pressed. Thereby, the display device (100) of the present invention prevents entering of a person into a projection area before projection of video, and controls inadvertent start-up.Type: GrantFiled: May 22, 2006Date of Patent: April 10, 2012Assignee: Panasonic CorporationInventors: Toshifumi Yokoyama, Ken'ichi Kasazumi, Shin-ichi Kadowaki, Kiminori Mizuuchi, Hiroyuki Furuya, Kazuhisa Yamamoto
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Patent number: 8121156Abstract: A semiconductor laser light source emits a laser beam for pumping. An optical resonator includes a solid laser crystal to be excited by the incident of a laser beam to oscillate a fundamental wave and a pair of fundamental wave reflective coats arranged at the opposite sides of the solid laser crystal. A wavelength conversion element converts the fundamental wave into a plurality of harmonics. The wavelength conversion element is so arranged in the optical resonator that the optical axis of at least one of the plurality of harmonics, generated in the optical resonator is made different from that of the fundamental wave and the at least one harmonic whose optical axis is made different is output substantially in the same direction as the other harmonic. By this construction, it is possible to stabilize a harmonic output and utilize a plurality of harmonics without increasing the number of parts.Type: GrantFiled: October 3, 2008Date of Patent: February 21, 2012Assignee: Panasonic CorporationInventors: Toshifumi Yokoyama, Kiminori Mizuuchi, Tetsuro Mizushima, Tatsuo Itoh
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Publication number: 20110147566Abstract: A wavelength conversion laser light source includes: a fundamental light source for outputting fundamental light; a wavelength conversion element with a nonlinear optical effect for converting the fundamental light into harmonic light of a different wavelength; a first optical receiver for receiving light of a specific polarization direction contained in the fundamental light output from the fundamental light source and converting an amount of light thereof into an electrical signal; a second optical receiver for receiving the harmonic light output from the wavelength conversion element and converting an amount of light thereof into an electrical signal; a temperature holding unit for holding a temperature of the wavelength conversion element constant; a fundamental light control unit for performing first control of controlling an amount of light of the fundamental light output from the fundamental light source based on the electrical signal from the second optical receiver, and second control of controllingType: ApplicationFiled: July 8, 2009Publication date: June 23, 2011Inventors: Hiroyuki Furuya, Koichi Kusukame, Tetsuro Mizushima, Toshifumi Yokoyama, Kenji Nakayama, Kazuhisa Yamamoto, Shinichi Kadowaki, Tomoya Sugita, Nobuyuki Horikawa
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Patent number: 7922336Abstract: A light source device for a display device for projecting an image on a screen is provided, the light source device for display device including a light source unit operable to output light; an image outputting unit operable to output an image by giving an image signal to the light; and a control circuit operable to switch the image output from the image outputting unit between a normal image and a mirror reversed image formed by reversing the normal image right and left by controlling the image signal, such that outputting type is switched between a front projection in which the image is projected onto the screen from a front on the same side as the viewing side, and a rear projection in which the image is projected onto the screen from a rear plane on the opposite side to the viewing side.Type: GrantFiled: February 28, 2006Date of Patent: April 12, 2011Assignee: Panasonic CorporationInventors: Toshifumi Yokoyama, Ken'ichi Kasazumi
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Patent number: 7907646Abstract: According to the present invention, a laser light source comprises plural semiconductor lasers (2), a solid laser (4), a non-linear material (3) as a wavelength conversion element, a reflection coat (5) formed on one facet of the solid laser, and a reflection coat (6) formed on one facet of the non-linear material (3), and the solid laser and the wavelength conversion element are disposed between the both reflection coats to constitute a laser resonator, and plural pump parts (8) in the solid laser (4) which are pumped by the plural semiconductor lasers are separated from each other by 300 ?m or more. Thereby, interference between transverse modes of laser oscillation is avoided, thereby providing a high-power, stable, and compact solid laser light source with which a stable high output power can be obtained.Type: GrantFiled: July 28, 2006Date of Patent: March 15, 2011Assignee: Panasonic CorporationInventors: Kiminori Mizuuchi, Kazuhisa Yamamoto, Hiroyuki Furuya, Toshifumi Yokoyama
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Patent number: 7866822Abstract: In the video projector of the present invention, a fiber part of a fiber laser is disposed so as to draw a circulating orbit of more than one circulation along the inner wall of the projector housing. Further, an FBG which is part of the fiber laser is fixed so that its shape is not changed. Furthermore, a pump LD part of the fiber laser is disposed apart from the SHG element. As a result, the video projector can be miniaturized, and the portability and installment of the video projector are facilitated. Further, the output stabilization of the fiber laser can be realized by preventing a shape change of the FBG. Furthermore, by disposing the SHG element apart from the pump LD part which forms a heat source, the temperature change of the SHG element is suppressed and the wavelength conversion efficiency by the SHG element is enhanced.Type: GrantFiled: November 4, 2005Date of Patent: January 11, 2011Assignee: Panasonic CorporationInventors: Toshifumi Yokoyama, Kazuhisa Yamamoto, Hiroyuki Furuya
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Publication number: 20100309438Abstract: A wavelength conversion laser 100 is provided with a solid-state laser having a cavity, and a wavelength converting element 6 arranged within the cavity. The solid-state laser includes two or more types of laser crystals 4 and 5 and oscillates solid-state laser light of multiple wavelengths. The wavelength converting element 6 converts the solid-state laser light of multiple wavelengths into light of second harmonic waves and sum-frequency wave of multiple wavelengths and simultaneously generates the second harmonic waves and sum-frequency wave of multiple wavelengths. The wavelength conversion laser 100 outputs converted wavelength light having a broad spectral width and low coherency, thereby enabling it to carry out highly efficient and stable high-output oscillation.Type: ApplicationFiled: November 25, 2008Publication date: December 9, 2010Inventors: Tetsuro Mizushima, Toshifumi Yokoyama, Tatsuo Itoh, Kenji Nakayama, Kiminori Mizuuchi, Kazuhisa Yamamoto
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Patent number: 7830932Abstract: An internal resonator type SHG light source includes a pump light source which emits a pump light; a solid-state laser which absorbs the pump light and which emits a fundamental wave; an output mirror provided so as to face the solid-state laser, which forms a resonator together with the solid-state laser; a wavelength conversion element provided in the resonator, which converts the fundamental wave into a harmonic wave; a detector which detects a temperature of the wavelength conversion element; and a rotating unit which changes an incident angle of the fundamental wave on the wavelength conversion element by rotating the wavelength conversion element, wherein the rotating unit rotates the wavelength conversion element according to the temperature of the wavelength conversion element as detected by the detector.Type: GrantFiled: October 19, 2007Date of Patent: November 9, 2010Assignee: Panasonic CorporationInventors: Toshifumi Yokoyama, Kiminori Mizuuchi
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Publication number: 20100238959Abstract: A semiconductor laser light source 10 emits a laser beam for pumping. An optical resonator 2 includes a solid laser crystal 15 to be excited by the incident of a laser beam to oscillate a fundamental wave 20 and a pair of fundamental wave reflective coats 14, 16 arranged at the opposite sides of the solid laser crystal 15. A wavelength conversion element 18 converts the fundamental wave 20 into a plurality of harmonics 21, 22. The wavelength conversion element 18 is so arranged in the optical resonator 2 that the optical axis of at least one of the plurality of harmonics 21, 22 generated in the optical resonator 2 is made different from that of the fundamental wave 20 and the at least one harmonic 22 whose optical axis is made different is output substantially in the same direction as the other harmonic 21. By this construction, it is possible to stabilize a harmonic output and utilize a plurality of harmonics without increasing the number of parts.Type: ApplicationFiled: October 3, 2008Publication date: September 23, 2010Inventors: Toshifumi Yokoyama, Kiminori Mizuuchi, Tetsuro Mizushima, Tatsuo Itoh
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Publication number: 20100220299Abstract: An image display device is provided with an image display unit for displaying an image visually recognizable by a viewer. The image display unit includes a sub-diffusion layer for diffusing laser light, a vibrator for vibrating the sub-diffusion layer, a primary diffusion layer for diffusing the laser light diffused by the sub-diffusion layer and a light shielding layer for cutting off outside light from a viewer side, wherein the primary diffusion layer and the light shielding layer are arranged at the viewer side of the sub-diffusion layer.Type: ApplicationFiled: May 18, 2007Publication date: September 2, 2010Inventors: Tetsuro Mizushima, Tatsuo Itoh, Toshifumi Yokoyama, Akira Kurozuka
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Publication number: 20100150186Abstract: According to the present invention, a laser light source comprises plural semiconductor lasers (2), a solid laser (4), a non-linear material (3) as a wavelength conversion element, a reflection coat (5) formed on one facet of the solid laser, and a reflection coat (6) formed on one facet of the non-linear material (3), and the solid laser and the wavelength conversion element are disposed between the both reflection coats to constitute a laser resonator, and plural pump parts (8) in the solid laser (4) which are pumped by the plural semiconductor lasers are separated from each other by 300 ?m or more. Thereby, interference between transverse modes of laser oscillation is avoided, thereby providing a high-power, stable, and compact solid laser light source with which a stable high output power can be obtained.Type: ApplicationFiled: July 28, 2006Publication date: June 17, 2010Applicant: Matsushita Electric Industrial Co. LtdInventors: Kiminori Mizuuchi, Kazuhisa Yamamoto, Hiroyuki Furuya, Toshifumi Yokoyama
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Publication number: 20100103088Abstract: A solid-state laser apparatus includes: a semiconductor laser light source for emitting laser light; an optical resonator having a solid-state laser medium to be excited by incidence of the laser light to oscillate fundamental laser light, and a mirror; and a quasi phase matching wavelength converting element, disposed in the optical resonator, for converting a wavelength of the fundamental laser light, wherein the quasi phase matching wavelength converting element is formed with a polarization inversion region having a predetermined cycle, and the length of the polarization inversion region in an optical axis direction is 1.0 mm or less.Type: ApplicationFiled: January 18, 2008Publication date: April 29, 2010Inventors: Toshifumi Yokoyama, Kazuhisa Yamamoto, Hiroyuki Furuya, Kiminori Mizuuchi
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Publication number: 20100008388Abstract: An internal resonator type SHG light source includes a pump light source which emits a pump light; a solid-state laser which absorbs the pump light and which emits a fundamental wave; an output mirror provided so as to face the solid-state laser, which forms a resonator together with the solid-state laser; a wavelength conversion element provided in the resonator, which converts the fundamental wave into a harmonic wave; a detector which detects a temperature of the wavelength conversion element; and a rotating unit which changes an incident angle of the fundamental wave on the wavelength conversion element by rotating the wavelength conversion element, wherein the rotating unit rotates the wavelength conversion element according to the temperature of the wavelength conversion element as detected by the detector.Type: ApplicationFiled: October 19, 2007Publication date: January 14, 2010Applicant: PANASONIC CORPORATIONInventors: Toshifumi Yokoyama, Kiminori Mizuuchi