Patents by Inventor Akira Nanba
Akira Nanba 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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Publication number: 20240136274Abstract: A quantum device capable of effectively cooling a quantum chip and an area (e.g., a space) therearound is provided. A quantum device includes a quantum chip and an interposer on which the quantum chip is located. The interposer includes an interposer substrate and an interposer wiring layer. The interposer wiring layer is disposed on a surface of the interposer substrate on a side on which the quantum chip is located. The interposer wiring layer includes, in at least a part thereof, a superconducting material layer formed of a superconducting material and a non-superconducting material layer formed of a non-superconducting material.Type: ApplicationFiled: July 26, 2023Publication date: April 25, 2024Applicant: NEC CorporationInventors: Katsumi KIKUCHI, Akira MIYATA, Suguru WATANABE, Takanori NISHI, Hideyuki SATOU, Kenji NANBA, Ayami YAMAGUCHI
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Patent number: 8359986Abstract: The present invention relates to protection of accommodated items such as cartridges each incorporating recording media and enhances a protection function for the accommodated items. The present invention relates to protection of accommodated items accommodated in an accommodating shelf into/out of which accommodated items (cartridges) such as cartridges each incorporating recording media such as magnetic tapes can be put/taken.Type: GrantFiled: November 30, 2007Date of Patent: January 29, 2013Assignee: Fujitsu LimitedInventors: Yukio Sekiguchi, Masahiko Katada, Katsufumi Onaka, Takanobu Kashiwagi, Akira Nanba
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Publication number: 20080178783Abstract: The present invention relates to protection of accommodated items such as cartridges each incorporating recording media and enhances a protection function for the accommodated items. The present invention relates to protection of accommodated items accommodated in an accommodating shelf into/out of which accommodated items (cartridges) such as cartridges each incorporating recording media such as magnetic tapes can be put/taken.Type: ApplicationFiled: November 30, 2007Publication date: July 31, 2008Inventors: Yukio SEKIGUCHI, Masahiko Katada, Katsufumi Onaka, Takanobu Kashiwagi, Akira Nanba
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Publication number: 20070268835Abstract: A control unit for transmitting data to control the operation of a controlled unit transmits a command via a main control channel and a sub control channel. The controlled unit distinguishes via which channel of the main control channel and the sub control channel received data is received and determines whether received data maintains a constant value for a predetermined period of time or not. When it is determined that the received data maintains a constant value, data for distinguishing a channel via which data is received and data indicating that a failure has occurred in a channel are transmitted to the control unit via the other channel. Receiving data indicating that a failure has occurred, the control unit outputs data indicating that a failure has occurred to the outside, and transmits subsequent data using the sub control channel when a failure has occurred in the main control channel.Type: ApplicationFiled: September 12, 2006Publication date: November 22, 2007Applicant: FUJITSU LIMITEDInventors: Takanobu Kashiwagi, Masahiko Katada, Katsufumi Onaka, Yukio Sekiguchi, Akira Nanba, Hironao Konishi
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Patent number: 7023769Abstract: A data recording method for calculating a digital sum value (DSV) corresponding to a proportion of positive data and negative data included in predetermined data ranges, selecting a resync pattern to be inserted between the data ranges according to the DSV, and inserting the selected resync pattern between the data ranges, has a step of selecting a resync pattern that minimizes differences in DSV between the data ranges.Type: GrantFiled: March 3, 2004Date of Patent: April 4, 2006Assignee: Fujitsu LimitedInventors: Kenichi Hamada, Akira Nanba, Masakazu Taguchi
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Patent number: 6944251Abstract: The digital phase locked loop circuit according to the invention includes a GAC circuit (4) for calculating the average frequency of the phase locked sampling clock signals in selected channels and for feeding back the calculated average to the phase locked loop. The GAC circuit (4) includes comparators (111˜118) for comparing the frequency of the sampling clock signals in each channel with an allowable frequency range and for outputting a frequency error signal with respect to any channel in which the frequency of the sampling clock signals is outside the allowable frequency range.Type: GrantFiled: January 8, 1999Date of Patent: September 13, 2005Assignee: Fujitsu LimitedInventors: Akira Nanba, Kenichi Ogura, Manabu Ogino
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Patent number: 6876607Abstract: A data recording method for calculating a digital sum value (DSV) corresponding to a proportion of positive data and negative data included in predetermined data ranges, selecting a resync pattern to be inserted between the data ranges according to the DSV, and inserting the selected resync pattern between the data ranges, has a step of selecting a resync pattern that minimizes differences in DSV between the data ranges.Type: GrantFiled: January 18, 2001Date of Patent: April 5, 2005Assignee: Fujitsu LimitedInventors: Satoshi Furuta, Kenichi Hamada, Akira Nanba, Masakazu Taguchi
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Publication number: 20040202078Abstract: A data recording method for calculating a digital sum value (DSV) corresponding to a proportion of positive data and negative data included in predetermined data ranges, selecting a resync pattern to be inserted between the data ranges according to the DSV, and inserting the selected resync pattern between the data ranges, has a step of selecting a resync pattern that minimizes differences in DSV between the data ranges.Type: ApplicationFiled: March 3, 2004Publication date: October 14, 2004Applicant: Fujitsu LimitedInventors: Kenichi Hamada, Akira Nanba, Masakazu Taguchi
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Patent number: 6781938Abstract: A data reproduction apparatus that employs an expected value generation unit that employs a maximum likelihood decoding algorithm, thereby an expected value is correctly determined from a histogram of sampled values of a signal to be reproduced, even when an offset arises in the signal to be reproduced, the offset being removed from the sampled values used in generating a histogram that is used to determine the expected value.Type: GrantFiled: April 5, 2002Date of Patent: August 24, 2004Assignee: Fujitsu LimitedInventors: Akira Nanba, Kenichi Hamada
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Patent number: 6775219Abstract: The present invention realizes stable and more proper data reproduction even when a reproduced signal varies locally due to a noise or includes a steady distortion. In a data reproduction control method and apparatus, and an optical disk unit that adjust sampled values, in sampling a signal reproduced from a recording medium recorded with data, the frequencies of the levels of quantized data are counted, a histogram of the frequencies of the levels is created based on the counting results, and more accurate reproduced data is obtained by means of a distribution of the frequencies of the levels in the histogram.Type: GrantFiled: June 9, 2003Date of Patent: August 10, 2004Assignee: Fujitsu LimitedInventors: Toru Fujiwara, Akira Nanba, Masakazu Taguchi
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Patent number: 6714504Abstract: The present invention realizes stable and more proper data reproduction even when a reproduced signal varies locally due to a noise or includes a steady distortion. In a data reproduction control method and apparatus, and an optical disk unit that adjust sampled values, in sampling a signal reproduced from a recording medium recorded with data, the frequencies of the levels of quantized data are counted, a histogram of the frequencies of the levels is created based on the counting results, and more accurate reproduced data is obtained by means of a distribution of the frequencies of the levels in the histogram.Type: GrantFiled: June 9, 2003Date of Patent: March 30, 2004Assignee: Fujitsu LimitedInventors: Toru Fujiwara, Akira Nanba, Masakazu Taguchi
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Patent number: 6680684Abstract: A data reproduction device includes an A/D converter quantizing a reproduction signal read from data recorded on a recording medium to produce quantized data based on a sampling clock; a reproduction signal determination unit determining rising and falling parts of the reproduction signal based on the quantized data, and outputting a gate signal corresponding to a result of determining the rising and falling parts; a leading-edge clock generation unit generating a leading-edge clock signal synchronous to a leading edge indicating a rising part of the reproduction signal; a trailing-edge clock generation unit generating a trailing-edge clock signal synchronous to a trailing edge indicating a falling part of the reproduction signal; a signal switch unit generating the sampling clock by selecting one of the leading-edge clock signal and the trailing-edge clock signal based on a value of the gate signal; and a signal supply unit supplying the sampling clock to the A/D converter, wherein the data reproduction deviType: GrantFiled: December 31, 2002Date of Patent: January 20, 2004Assignee: Fujitsu LimitedInventors: Akira Nanba, Kenichi Hamada, Masakazu Taguchi
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Publication number: 20030202445Abstract: The present invention realizes stable and more proper data reproduction even when a reproduced signal varies locally due to a noise or includes a steady distortion. In a data reproduction control method and apparatus, and an optical disk unit that adjust sampled values, in sampling a signal reproduced from a recording medium recorded with data, the frequencies of the levels of quantized data are counted, a histogram of the frequencies of the levels is created based on the counting results, and more accurate reproduced data is obtained by means of a distribution of the frequencies of the levels in the histogram.Type: ApplicationFiled: June 9, 2003Publication date: October 30, 2003Applicant: Fujitsu LimitedInventors: Toru Fujiwara, Akira Nanba, Masakazu Taguchi
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Publication number: 20030198169Abstract: The present invention realizes stable and more proper data reproduction even when a reproduced signal varies locally due to a noise or includes a steady distortion. In a data reproduction control method and apparatus, and an optical disk unit that adjust sampled values, in sampling a signal reproduced from a recording medium recorded with data, the frequencies of the levels of quantized data are counted, a histogram of the frequencies of the levels is created based on the counting results, and more accurate reproduced data is obtained by means of a distribution of the frequencies of the levels in the histogram.Type: ApplicationFiled: June 9, 2003Publication date: October 23, 2003Applicant: Fujitsu LimitedInventors: Toru Fujiwara, Akira Nanba, Masakazu Taguchi
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Patent number: 6618338Abstract: The present invention realizes stable and more proper data reproduction even when a reproduced signal varies locally due to a noise or includes a steady distortion. In a data reproduction control method and apparatus, and an optical disk unit that adjust sampled values, in sampling a signal reproduced from a recording medium recorded with data, the frequencies of the levels of quantized data are counted, a histogram of the frequencies of the levels is created based on the counting results, and more accurate reproduced data is obtained by means of a distribution of the frequencies of the levels in the histogram.Type: GrantFiled: July 6, 2001Date of Patent: September 9, 2003Assignee: Fujitsu LimitedInventors: Toru Fujiwara, Akira Nanba, Masakazu Taguchi
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Patent number: 6603419Abstract: A data reproduction device reproduces the data recorded on the recording medium by executing digital signal processing on the quantized data. The data reproduction device can share a single A/D converter and a single decoder used for reproducing recorded data based on clocks synchronous to a leading edge and a trailing edge of the recording pit.Type: GrantFiled: January 31, 2001Date of Patent: August 5, 2003Assignee: Fujitsu LimitedInventors: Akira Nanba, Kenichi Hamada, Masakazu Taguchi
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Publication number: 20030112733Abstract: A data reproduction apparatus that employs an expected value generation unit that employs a maximum likelihood decoding algorithm, thereby an expected value is correctly determined from a histogram of sampled values of a signal to be reproduced, even when an offset arises in the signal to be reproduced, the offset being removed from the sampled values used in generating a histogram that is used to determine the expected value.Type: ApplicationFiled: April 5, 2002Publication date: June 19, 2003Applicant: FUJITSU LIMITEDInventors: Akira Nanba, Kenichi Hamada
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Publication number: 20030090403Abstract: A data reproduction device includes an A/D converter quantizing a reproduction signal read from data recorded on a recording medium to produce quantized data based on a sampling clock; a reproduction signal determination unit determining rising and falling parts of the reproduction signal based on the quantized data, and outputting a gate signal corresponding to a result of determining the rising and falling parts; a leading-edge clock generation unit generating a leading-edge clock signal synchronous to a leading edge indicating a rising part of the reproduction signal; a trailing-edge clock generation unit generating a trailing-edge clock signal synchronous to a trailing edge indicating a falling part of the reproduction signal; a signal switch unit generating the sampling clock by selecting one of the leading-edge clock signal and the trailing-edge clock signal based on a value of the gate signal; and a signal supply unit supplying the sampling clock to the A/D converter, wherein the data reproduction deviType: ApplicationFiled: December 31, 2002Publication date: May 15, 2003Applicant: FUJITSU LIMITEDInventors: Akira Nanba, Kenichi Hamada, Masakazu Taguchi
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Publication number: 20020000926Abstract: A data reproduction device includes an A/D converter quantizing a reproduction signal read from data recorded on a recording medium to produce quantized data based on a sampling clock; a reproduction signal determination unit determining rising and falling parts of the reproduction signal based on the quantized data, and outputting a gate signal corresponding to a result of determining the rising and falling parts; a leading-edge clock generation unit generating a leading-edge clock signal synchronous to a leading edge indicating a rising part of the reproduction signal; a trailingedge clock generation unit generating a trailingedge clock signal synchronous to a trailing edge indicating a falling part of the reproduction signal; a signal switch unit generating the sampling clock by selecting one of the leading-edge clock signal and the trailing-edge clock signal based on a value of the gate signal; and a signal supply unit supplying the sampling clock to the A/D converter, wherein the data reproduction deviceType: ApplicationFiled: January 31, 2001Publication date: January 3, 2002Applicant: Fujitsu Limited, Kawasaki, JapanInventors: Akira Nanba, Kenichi Hamada, Masakazu Taguchi
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Publication number: 20020001264Abstract: A data recording method for calculating a digital sum value (DSV) corresponding to a proportion of positive data and negative data included in predetermined data ranges, selecting a resync pattern to be inserted between the data ranges according to the DSV, and inserting the selected resync pattern between the data ranges, has a step of selecting a resync pattern that minimizes differences in DSV between the data ranges.Type: ApplicationFiled: January 18, 2001Publication date: January 3, 2002Applicant: FUJITSU LIMITEDInventors: Satoshi Furuta, Kenichi Hamada, Akira Nanba, Masakazu Taguchi