Patents by Inventor Tadahiro Sato
Tadahiro Sato 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: 11990963Abstract: A radio communication apparatus includes a plurality of antennas, a radio transmission unit configured to execute radio transmission processing on data to be transmitted from the plurality of antennas, and a processor connected to the radio transmission unit. The processor executes a process including acquiring beam group specification information that specifies a beam group that is capable of being formed when the data to be transmitted is transmitted, forming at least one beam included in the beam group, and correcting an envelope of a beam group using correction factors, the beam group including the at least one beam formed, the correction factors corresponding to the beam group specification information.Type: GrantFiled: October 3, 2022Date of Patent: May 21, 2024Assignee: FUJITSU LIMITEDInventors: Katsuhiko Tsujihata, Kazuyuki Ozaki, Shunsuke Fujio, Kunifumi Tamachi, Kazunori Sato, Tadahiro Sato, Hiroshi Okagawa, Yoji Ohashi, Yusuke Furuumi, Shinichiro Kobayashi
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Publication number: 20230208484Abstract: A radio communication apparatus includes a plurality of antennas, a radio transmission unit configured to execute radio transmission processing on data to be transmitted from the plurality of antennas, and a processor connected to the radio transmission unit. The processor executes a process including acquiring beam group specification information that specifies a beam group that is capable of being formed when the data to be transmitted is transmitted, forming at least one beam included in the beam group, and correcting an envelope of a beam group using correction factors, the beam group including the at least one beam formed, the correction factors corresponding to the beam group specification information.Type: ApplicationFiled: October 3, 2022Publication date: June 29, 2023Applicant: Fujitsu LimitedInventors: Katsuhiko Tsujihata, Kazuyuki Ozaki, Shunsuke FUJIO, KUNIFUMI TAMACHI, Kazunori Sato, Tadahiro Sato, Hiroshi Okagawa, Yoji Ohashi, Yusuke FURUUMI, Shinichiro Kobayashi
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Patent number: 10266961Abstract: Buckling of a vitreous silica crucible or fall of a sidewall into the crucible is effectively suppressed. Furthermore, dislocations in a silicon single crystal are suppressed to enhance the yield of the single crystal. The vitreous silica crucible is used to pull single-crystal silicon and includes the cylindrical sidewall having an upward-opening rim, a mortar-shaped bottom including a curve, and a round portion connecting the sidewall and the bottom. The round portion is provided in such a manner that the curvature of the inner surface thereof is gradually increased from the sidewall toward the bottom in a section passing through the rotation axis of the vitreous silica crucible.Type: GrantFiled: October 31, 2012Date of Patent: April 23, 2019Assignee: SUMCO CORPORATIONInventors: Toshiaki Sudo, Tadahiro Sato, Eriko Kitahara, Takeshi Fujita
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Patent number: 10243612Abstract: A wireless apparatus configured to be cascaded to another wireless apparatus through a transmission path and to be coupled to an antenna multiplexer, the another wireless apparatus being coupled to the antenna multiplexer, the wireless apparatus includes a processor configured to specify a first time length for a first transmission signal having a first frequency band to pass through the wireless apparatus, specify a second time length for a second transmission signal having a second frequency band to pass through the wireless apparatus, the transmission path, and the another wireless apparatus, specify a difference between the first time length and the second time length, delay the second transmission signal by the specified difference, generate a cancellation signal for an intermodulation distortion that occurs in a received signal due to intermodulation between the first transmission signal and the second transmission signal, and combine the cancellation signal with the received signal.Type: GrantFiled: July 3, 2018Date of Patent: March 26, 2019Assignee: Fujitsu LimitedInventors: Kyosuke Mukaida, Hideyuki Kannari, Hiroyuki Sekino, Tadahiro Sato, Yusuke Tobisu
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Publication number: 20180316385Abstract: A wireless apparatus configured to be cascaded to another wireless apparatus through a transmission path and to be coupled to an antenna multiplexer, the another wireless apparatus being coupled to the antenna multiplexer, the wireless apparatus includes a processor configured to specify a first time length for a first transmission signal having a first frequency band to pass through the wireless apparatus, specify a second time length for a second transmission signal having a second frequency band to pass through the wireless apparatus, the transmission path, and the another wireless apparatus, specify a difference between the first time length and the second time length, delay the second transmission signal by the specified difference, generate a cancellation signal for an intermodulation distortion that occurs in a received signal due to intermodulation between the first transmission signal and the second transmission signal, and combine the cancellation signal with the received signal.Type: ApplicationFiled: July 3, 2018Publication date: November 1, 2018Applicant: FUJITSU LIMITEDInventors: Kyosuke Mukaida, Hideyuki Kannari, Hiroyuki Sekino, Tadahiro Sato, Yusuke Tobisu
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Patent number: 10024784Abstract: A vitreous silica crucible used to pull up silicon single crystal includes: a cylindrical straight body portion, a corner portion formed at a lower end of the straight body portion, and a bottom portion connected with the straight body portion via the corner portion, wherein the vitreous silica crucible further comprises: an opaque outer layer enclosing bubbles therein; and a transparent inner layer from which bubbles are removed, wherein the residual distortion's distribution obtained by measuring the silica glass's inner surface in a non-destructed state has an optical path difference which is 130 nm or less, which residual distortion's distribution is measured using a distortion-measuring apparatus which converts a linearly polarized light into circularly polarized light and then irradiates the crucible's wall.Type: GrantFiled: October 13, 2017Date of Patent: July 17, 2018Assignee: SUMCO CORPORATIONInventors: Toshiaki Sudo, Tadahiro Sato, Ken Kitahara, Eriko Kitahara
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Patent number: 9964478Abstract: A destructive inspection method of a vitreous silica crucible for pulling a silicon single crystal evaluates a crack state of an inner surface of the vitreous silica crucible supported by a graphite susceptor when a load is instantaneously applied to at least one point on the inner surface via an automatic center punch while pushing the tip portion of the automatic center punch against the inner surface. The destructive inspection method can inspect the vitreous silica crucible under conditions as close to the actual conditions of use as possible.Type: GrantFiled: September 24, 2015Date of Patent: May 8, 2018Assignee: SUMCO CORPORATIONInventors: Ken Kitahara, Tadahiro Sato, Toshiaki Sudo, Eriko Kitahara, Takashi Watanabe
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Patent number: 9932692Abstract: A vitreous silica crucible includes: a substantially cylindrical straight body portion having an opening on a top end and extending in a vertical direction; a curved bottom portion; and a corner portion connecting the straight body portion with the bottom portion and a curvature of which is greater than that of the bottom portion, wherein an inner surface of the crucible has a concavo-convex structure in which groove-shaped valleys are interposed between ridges, and an average interval of the ridges is 5-100 ?m.Type: GrantFiled: June 30, 2013Date of Patent: April 3, 2018Assignee: SUMCO CORPORATIONInventors: Toshiaki Sudo, Tadahiro Sato, Ken Kitahara, Eriko Kitahara
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Publication number: 20180062696Abstract: A passive intermodulation (PIM) canceller of a communication device includes a combining unit, a replica generating unit, and a delay measuring instrument. The replica generating unit generates an intermodulation signal based on the amount of delay of each transmission signal. The combining unit cancels out the intermodulation signal from the reception signal using the generated intermodulation signal. The delay measuring instrument delays a transmission signal x2 included in a plurality of transmission signals by different first amounts of delay. The delay measuring instrument generates an intermediate signal Sm1 by multiplying the delayed transmission signal x2 to the reception signal. The delay measuring instrument calculates, based on the correlation values of the intermediate signal Sm1 corresponding to each first amount of delay and a transmission signal x1 included in the plurality of transmission signals, the amount of delay of the transmission signal x1 with respect to the intermodulation signal.Type: ApplicationFiled: July 12, 2017Publication date: March 1, 2018Applicant: FUJITSU LIMITEDInventors: TOSHIO KAWASAKI, Nobuhisa Aoki, TORU MANIWA, Tadahiro Sato, Yusuke Tobisu, Hiroshi Towata
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Publication number: 20180045639Abstract: A vitreous silica crucible used to pull up silicon single crystal includes: a cylindrical straight body portion, a corner portion formed at a lower end of the straight body portion, and a bottom portion connected with the straight body portion via the corner portion, wherein the vitreous silica crucible further comprises: an opaque outer layer enclosing bubbles therein; and a transparent inner layer from which bubbles are removed, wherein the residual distortion's distribution obtained by measuring the silica glass's inner surface in a non-destructed state has an optical path difference which is 130 nm or less, which residual distortion's distribution is measured using a distortion-measuring apparatus which converts a linearly polarized light into circularly polarized light and then irradiates the crucible's wall.Type: ApplicationFiled: October 13, 2017Publication date: February 15, 2018Inventors: Toshiaki SUDO, Tadahiro SATO, Ken KITAHARA, Eriko KITAHARA
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Patent number: 9863059Abstract: A method for pulling silicon single crystal includes a process of placing a molded body between a susceptor's inner surface and a crucible's outer surface. The molded body is formed based on three-dimensional data of the inner surface shape of the susceptor which can hold the vitreous silica crucible and three-dimensional data of the crucible so as to make the susceptor's central axis and the crucible's central axis substantially aligned when it is placed between the susceptor's inner surface and the crucible's outer surface.Type: GrantFiled: June 29, 2013Date of Patent: January 9, 2018Assignee: SUMCO CORPORATIONInventors: Toshiaki Sudo, Tadahiro Sato, Ken Kitahara, Eriko Kitahara
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Patent number: 9863061Abstract: In an embodiment, a vitreous silica crucible 1 includes a cylindrical straight body portion 10a, a corner portion 10c formed at lower end of the straight body portion 10a, and a bottom portion 10b connected with the straight body portion 10a via the corner portion 10c. Moreover, the vitreous silica crucible 1 includes a bubble-containing opaque layer 11 constituting an outer layer, and a bubble-free transparent layer 12 constituting an inner layer. A boundary surface, between the opaque layer 11 and the transparent layer 12 in at least the straight body portion 10a, forms a periodic wave surface in a vertical direction. The vitreous silica crucible can suppress deformation under high temperature.Type: GrantFiled: December 25, 2014Date of Patent: January 9, 2018Assignee: SUMCO CORPORATIONInventors: Toshiaki Sudo, Tadahiro Sato, Ken Kitahara, Eriko Kitahara
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Patent number: 9816917Abstract: In an embodiment, a distortion-measuring apparatus for measuring a distortion distribution of an entire vitreous silica crucible in a non-destructive way includes: a light source 11; a first polarizer 12 and a first quarter-wave plate 13 disposed between the light source 11 and an outer surface of a vitreous silica crucible wall; a camera 14 disposed inside of a vitreous silica crucible 1; a camera control mechanism 15 configured to control a photographing direction of the camera 14; a second polarizer 16 and a second quarter-wave plate 17 disposed between the camera 14 and an inner surface of the vitreous silica crucible wall. An optical axis of the second quarter-wave plate 17 inclines 90 degrees with respect to the first quarter-wave plate 13.Type: GrantFiled: December 25, 2014Date of Patent: November 14, 2017Assignee: SUMCO CORPORATIONInventors: Toshiaki Sudo, Tadahiro Sato, Ken Kitahara, Eriko Kitahara
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Patent number: 9809902Abstract: The present invention provides a method for evaluating a vitreous silica crucible which can measure a three-dimensional shape of the inner surface of the crucible in a non-destructive manner.Type: GrantFiled: October 31, 2012Date of Patent: November 7, 2017Assignee: SUMCO CORPORATIONInventors: Toshiaki Sudo, Tadahiro Sato, Ken Kitahara, Eriko Kitahara, Makiko Kodama
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Patent number: 9810526Abstract: A method for measuring a three-dimensional shape of an inner surface of a vitreous silica crucible which enables the measurement of the three-dimensional shape of the inner surface of the crucible without contaminating the inner surface of the crucible, is provided. According to the present invention, a method for measuring a three-dimensional shape of a vitreous silica crucible, including a fogging step to form a fog onto an inner surface of the vitreous silica crucible, a three-dimensional shape measuring step to measure a three-dimensional shape of the inner surface, by measuring a reflected light from the inner surface irradiated with light, is provided.Type: GrantFiled: October 31, 2012Date of Patent: November 7, 2017Assignee: SUMCO CORPORATIONInventors: Toshiaki Sudo, Tadahiro Sato, Ken Kitahara
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Publication number: 20170318488Abstract: A multiplexing device for multiplexing uplink signals transmitted from each of a plurality of radio devices and outputting the multiplexed signal to a radio control device performs a calculation processing that calculates a power value of the uplink signal for each radio device, performs a determination processing that determines whether or not noise of a radio device that transmits an uplink signal is dominant among signal components included in the uplink signal, using the power value of the uplink signal, performs a blocking processing that blocks the uplink signal in which the noise is dominant in a case where the noise is determined to be dominant among the signal components included in the uplink signal, and performs a multiplexing processing that multiplexes uplink signals that are not blocked among the uplink signals for each radio device, and outputs the multiplexed signal to the radio control device.Type: ApplicationFiled: March 30, 2017Publication date: November 2, 2017Applicant: FUJITSU LIMITEDInventors: Akifumi Adachi, Tadanori YOKOSAWA, HIDEYUKI KANNARI, Tadahiro Sato
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Publication number: 20170292901Abstract: A destructive inspection method of a vitreous silica crucible for pulling a silicon single crystal evaluates a crack state of an inner surface of the vitreous silica crucible supported by a graphite susceptor when a load is instantaneously applied to at least one point on the inner surface via an automatic center punch while pushing the tip portion of the automatic center punch against the inner surface. The destructive inspection method can inspect the vitreous silica crucible under conditions as close to the actual conditions of use as possible.Type: ApplicationFiled: September 24, 2015Publication date: October 12, 2017Inventors: Ken KITAHARA, Tadahiro SATO, Toshiaki SUDO, Eriko KITAHARA, Takashi WATANABE
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Publication number: 20170292204Abstract: Spatial coordinates of multiple points on an inner surface of a vitreous silica crucible are measured prior to filling raw material in the vitreous silica crucible, and a three-dimensional shape of the inner surface of the vitreous silica crucible using a combination of polygons having vertex coordinates constituted by the respective measured points is specified (S11); a predictive value of an initial liquid surface level of the silicon melt in the vitreous silica crucible is preset (S12); a volume of the silicon melt satisfying the predictive value of the initial liquid surface level is obtained based on the three-dimensional shape of the inner surface of the vitreous silica crucible (S13); a weight of the silicon melt having the volume is obtained (S14); raw material having the weight is filled in the vitreous silica crucible (S15); a dipping control of the seed crystal is performed based on the predictive value of the initial liquid surface level (S17).Type: ApplicationFiled: September 24, 2015Publication date: October 12, 2017Inventors: Tadahiro SATO, Eriko KITAHARA, Toshiaki SUDO, Ken KITAHARA
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Vitreous silica crucible for pulling of silicon single crystal and method for manufacturing the same
Patent number: 9758901Abstract: The present invention provides a vitreous silica crucible which inhibits a deformation even when used under a high temperature condition for a long time, and a method for manufacturing the same. The vitreous silica crucible comprises: a substantially cylindrical straight body portion having an opening on the top end and extending in a vertical direction, a curved bottom portion, and a corner portion connecting the straight body portion with the bottom portion and a curvature of which is greater than that of the bottom portion, wherein, the vitreous silica crucible comprises a transparent layer on the inside and a bubble layer on the outside thereof, a compressive stress layer in which compressive stress remains in the inner surface side of the transparent layer, and a tensile stress layer in which tensile stress remains and is adjacent to the compressive stress layer at a gradual rate of change of stress.Type: GrantFiled: May 31, 2013Date of Patent: September 12, 2017Assignee: SUMCO CORPORATIONInventors: Toshiaki Sudo, Ken Kitahara, Akihiro Aiba, Kazushi Ousyuya, Fumie Yoshida, Makiko Hinooka, Eriko Kitahara, Tadahiro Sato -
Patent number: 9758900Abstract: Buckling of a vitreous silica crucible 12 or inward fall of a sidewall 15 is effectively suppressed. The vitreous silica crucible 12 includes the cylindrical sidewall 15 having an upward-opening rim, a mortar-shaped bottom 16 including a curve, and a round portion 17 connecting the sidewall 15 and the bottom 16. In the vitreous silica crucible 12 the per-unit area thermal resistance in the thickness direction of the sidewall 15 is higher than that of the round portion 17.Type: GrantFiled: October 31, 2012Date of Patent: September 12, 2017Assignee: SUMCO CORPORATIONInventors: Toshiaki Sudo, Tadahiro Sato, Ken Kitahara, Takuma Yoshioka, Hiroshi Kishi