Patents by Inventor Yasuyuki Takeshita
Yasuyuki Takeshita 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: 10812195Abstract: An optical communication device, for performing communication between spatially separated points by using one or more laser beams, includes an angle correction device that corrects a direction of a light receiving system and an emission optical axis correction device, in which an angle error which is not corrected by the angle correction device is detected by a light receiving angle detection device, and the emission optical axis correction device is controlled according to a detected error amount, and an emission optical axis is corrected.Type: GrantFiled: December 26, 2017Date of Patent: October 20, 2020Assignee: SONY CORPORATIONInventors: Takashi Nakao, Kyohei Iwamoto, Taiji Ito, Tamotsu Ishii, Mitsuhiro Ueno, Shinji Ohta, Takeshi Sano, Keiichi Shibata, Yasuyuki Takeshita, Hiromitsu Komatsu
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Publication number: 20200127738Abstract: An optical communication device, for performing communication between spatially separated points by using one or more laser beams, includes an angle correction device that corrects a direction of a light receiving system and an emission optical axis correction device, in which an angle error which is not corrected by the angle correction device is detected by a light receiving angle detection device, and the emission optical axis correction device is controlled according to a detected error amount, and an emission optical axis is corrected.Type: ApplicationFiled: December 26, 2017Publication date: April 23, 2020Inventors: TAKASHI NAKAO, KYOHEI IWAMOTO, TAIJI ITO, TAMOTSU ISHII, MITSUHIRO UENO, SHINJI OHTA, TAKESHI SANO, KEIICHI SHIBATA, YASUYUKI TAKESHITA, HIROMITSU KOMATSU
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Patent number: 7680166Abstract: A laser drive includes a variable output voltage source that can control an output voltage, a laser source connected to the variable output voltage source, a laser drive circuit that drives the laser source, and a monitoring controller that monitors an operating voltage of the laser drive circuit and controls the output of the variable output voltage source such that the monitored operating voltage becomes equal to a desired value.Type: GrantFiled: December 13, 2005Date of Patent: March 16, 2010Assignee: Sony CorporationInventors: Motoi Kimura, Yasuyuki Takeshita, Hidetaka Kodama
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Patent number: 7656753Abstract: The present invention proposes a method of controlling the laser power of a semiconductor laser that, in this method of controlling the laser power of a semiconductor laser by applying a power source voltage to between the collector and emitter of an output transistor and a serial circuit of the output transistor and a semiconductor laser, enables decreasing the power consumption of the output transistor. The present invention is arranged to apply a variable power source voltage Vcc to a serial circuit of an output transistor (Qb) and a semiconductor laser (SL) and thereby control the variable power source voltage Vcc such that a difference between the variable power source voltage Vcc and the peak hold voltage of an operating voltage of the semiconductor laser (SL) becomes substantially constant.Type: GrantFiled: March 12, 2007Date of Patent: February 2, 2010Assignee: Sony CorporationInventors: Kazuhiko Fujiie, Yasuyuki Takeshita
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Patent number: 7355952Abstract: A liquid crystal device, and a method and an apparatus for driving the same in which the refractive index of the liquid crystal device is adjusted using a simple driving method and apparatus, which is advantageous in that the cost is reduced, are provided. A liquid crystal device (10) includes a first transparent substrate (1002) and a second transparent substrate (1004) that face each other, a liquid crystal (1014) filled between the first and second transparent substrates (1002, 1004), a first transparent electrode (1006) formed on a surface of the first transparent substrate (1002) that faces the second transparent substrate (1004), and a second transparent electrode (1008) formed on a surface of the second transparent substrate (1004) that faces the first transparent substrate (1002). First and second driving signals (S1, S2) of square waves are applied to the first and second transparent electrodes (1002, 1004) with a time interval t (sec) therebetween.Type: GrantFiled: March 5, 2003Date of Patent: April 8, 2008Assignee: Sony CorporationInventors: Yasuyuki Takeshita, Atsushi Fukumoto, Shinichi Kai
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Publication number: 20070147452Abstract: The present invention proposes a method of controlling the laser power of a semiconductor laser that, in this method of controlling the laser power of a semiconductor laser by applying a power source voltage to between the collector and emitter of an output transistor and a serial circuit of the output transistor and a semiconductor laser, enables decreasing the power consumption of the output transistor. The present invention is arranged to apply a variable power source voltage Vcc to a serial circuit of an output transistor (Qb) and a semiconductor laser (SL) and thereby control the variable power source voltage Vcc such that a difference between the variable power source voltage Vcc and the peak hold voltage of an operating voltage of the semiconductor laser (SL) becomes substantially constant.Type: ApplicationFiled: March 12, 2007Publication date: June 28, 2007Applicant: Sony CorporationInventors: Kazuhiko Fujiie, Yasuyuki Takeshita
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Patent number: 7190641Abstract: The present invention proposes a method of controlling the laser power of a semiconductor laser that, in this method of controlling the laser power of a semiconductor laser by applying a power source voltage to between the collector and emitter of an output transistor and a serial circuit of the output transistor and a semiconductor laser, enables decreasing the power consumption of the output transistor. The present invention is arranged to apply a variable power source voltage Vcc to a serial circuit of an output transistor (Qb) and a semiconductor laser (SL) and thereby control the variable power source voltage Vcc such that a difference between the variable power source voltage Vcc and the peak hold voltage of an operating voltage of the semiconductor laser (SL) becomes substantially constant.Type: GrantFiled: November 16, 2001Date of Patent: March 13, 2007Assignee: Sony CorporationInventors: Kazuhiko Fujiie, Yasuyuki Takeshita
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Publication number: 20060153259Abstract: A laser drive includes a variable output voltage source that can control an output voltage, a laser source connected to the variable output voltage source, a laser drive circuit that drives the laser source, and a monitoring controller that monitors an operating voltage of the laser drive circuit and controls the output of the variable output voltage source such that the monitored operating voltage becomes equal to a desired value.Type: ApplicationFiled: December 13, 2005Publication date: July 13, 2006Applicant: SONY CORPORATIONInventors: Motoi Kimura, Yasuyuki Takeshita, Hidetaka Kodama
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Publication number: 20050174339Abstract: A liquid crystal device, and a method and an apparatus for driving the same in which the refractive index of the liquid crystal device is adjusted using a simple driving method and apparatus, which is advantageous in that the cost is reduced, are provided. A liquid crystal device (10) includes a first transparent substrate (1002) and a second transparent substrate (1004) that face each other, a liquid crystal (1014) filled between the first and second transparent substrates (1002, 1004), a first transparent electrode (1006) formed on a surface of the first transparent substrate (1002) that faces the second transparent substrate (1004), and a second transparent electrode (1008) formed on a surface of the second transparent substrate (1004) that faces the first transparent substrate (1002). First and second driving signals (S1, S2) of square waves are applied to the first and second transparent electrodes (1002, 1004) with a time interval t (sec) therebetween.Type: ApplicationFiled: March 5, 2003Publication date: August 11, 2005Applicant: Sony CorporationInventors: Yasuyuki Takeshita, Atsushi Fukumoto, Shinichi Kai
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Publication number: 20050117615Abstract: The present invention proposes a method of controlling the laser power of a semiconductor laser that, in this method of controlling the laser power of a semiconductor laser by applying a power source voltage to between the collector and emitter of an output transistor and a serial circuit of the output transistor and a semiconductor laser, enables decreasing the power consumption of the output transistor. The present invention is arranged to apply a variable power source voltage Vcc to a serial circuit of an output transistor (Qb) and a semiconductor laser (SL) and thereby control the variable power source voltage Vcc such that a difference between the variable power source voltage Vcc and the peak hold voltage of an operating voltage of the semiconductor laser (SL) becomes substantially constant.Type: ApplicationFiled: November 16, 2001Publication date: June 2, 2005Applicant: SONY CorporationInventors: Kazuhiko Fujiie, Yasuyuki Takeshita
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Patent number: 6744700Abstract: A reproducing laser output can be adjusted to an optimal level. To this end, a magneto-optical disk device includes a differential amplifier and a shortest recording mark identifier that detects a shortest recording mark reproducing signal corresponding to a component of a shortest recording mark in a reproducing signal obtained by reproducing a magneto-optical disk. In addition, an envelope detector detects an amplitude level of the shortest recording mark reproducing signal, a comparator compares the amplitude level with a reference voltage outputted from the reference voltage source, and a drive control section adjusts the reproducing laser beam to an output level at which the amplitude level is equal to or higher than the reference voltage, based on a comparison result from the comparator.Type: GrantFiled: February 14, 2003Date of Patent: June 1, 2004Assignee: Sony CorporationInventors: Keiichi Tsutsui, Yasuyuki Takeshita
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Publication number: 20030117905Abstract: A reproducing laser output can be adjusted to an optinal level. To this end, a magneto-optical disk device 1 comprises a differential amplifier 23 and a shortest recording mark identifier 33 which detect a shortest recording mark reproducing signal corresponding to a component of a shortest recording mark in a reproducing signal obtained by reproducing a magneto-optical disk 100, an envelope detector 33 which detects an amplitude level of the shortest recording mark reproducing signal, a comparator 35 which compares the amplitude level with a reference voltage outputted from the reference voltage source 34, and a drive control section 30 which adjusts the reproducing laser beam to an output level at which the amplitude level is equal to or higher than the reference voltage, based on a comparison result from the comparator 35.Type: ApplicationFiled: February 14, 2003Publication date: June 26, 2003Applicant: Sony CorporationInventors: Keiichi Tsutsui, Yasuyuki Takeshita
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Patent number: 6552967Abstract: A reproducing laser output can be adjusted to an optimal level. To this end, a magneto-optical disk device includes a differential amplifier and a shortest recording mark identifier that detects a shortest recording mark reproducing signal corresponding to a component of a shortest recording mark in a reproducing signal obtained by reproducing a magneto-optical disk. In addition, an envelope detector detects an amplitude level of the shortest recording mark reproducing signal, a comparator compares the amplitude level with a reference voltage outputted from the reference voltage source, and a drive control section adjusts the reproducing laser beam to an output level at which the amplitude level is equal to or higher than the reference voltage, based on a comparison result from the comparator.Type: GrantFiled: May 8, 2000Date of Patent: April 22, 2003Assignee: Sony CorporationInventors: Keiichi Tsutsui, Yasuyuki Takeshita