Patents by Inventor Kazuhiko Fujiie
Kazuhiko Fujiie 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: 20130070577Abstract: Provided is an optical recording medium, including a plurality of tracks on each of which small record carriers are arranged in a wobbling manner, each of the small record carriers storing a recording state by modulation according to light irradiation, wherein the tracks are arranged adjacent to each other in a tracking direction which is a direction orthogonal to a longitudinal direction of the tracks, and there is a reflectance difference between a forming portion and a non-forming portion of the small record carrier in both of a recording state and a non-recording state of the small record carrier.Type: ApplicationFiled: September 7, 2012Publication date: March 21, 2013Applicant: SONY CORPORATIONInventors: Yoshinori Suzuki, Kazuhiko Fujiie, Koji Sekiguchi
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Patent number: 8149661Abstract: Directed to freely adjusting an emission period of a semiconductor laser. In the present invention, pulsed light serving as pulse-shaped laser light (LL) is emitted from a semiconductor laser (3), and a laser drive voltage (DJ) that is generated on the basis of a pulse signal (SL) and that has pulse-shaped drive voltage pulses (DJw) is applied to the semiconductor laser (3). At this time, a short-pulse light source (51) varies a voltage period (TV) corresponding to an interval between the drive voltage pulses (DJw), thereby varying a set period (TS) corresponding to an interval between generated signal pulses (SLw) in the pulse signal (SL).Type: GrantFiled: September 16, 2009Date of Patent: April 3, 2012Assignee: Sony CorporationInventors: Tsutomu Ishimoto, Kazuhiko Fujiie
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Publication number: 20120051206Abstract: An objective lens includes: a solid immersion lens having a super-hemispherical or hemispherical shape, wherein a hyper-lens portion is formed in a part of an object-side surface of the solid immersion lens and integrated therewith by alternately stacking a first thin film having a positive dielectric constant and a second thin film having a negative dielectric constant along spherical shapes starting from a spherical shape having a radius Ri around a predetermined reference point Pr set outside the object-side surface of the solid immersion lens to a spherical surface having a radius Ro (Ro>Ri) around the reference point Pr.Type: ApplicationFiled: August 18, 2011Publication date: March 1, 2012Applicant: SONY CORPORATIONInventors: Kazuhiko Fujiie, Koji Sekiguchi
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Patent number: 8072871Abstract: The present invention realizes the emission of a high-output short-pulse beam and a reduction in power consumption. A laser control unit (2) of a short-pulse light-source device (1) raises a gate pulse (PG) of a gate signal (SG) supplied to a power supply circuit (5) in such a manner that the gate pulse (PG) rises only for the duration of an extremely short pulse width (T) to include the rise time of a generated pulse (PL) of a pulse signal (SL) supplied to a driving circuit (6). In this way, necessary power can be supplied at the rise timing of the generated pulse (PL), and the power consumption (Pa) can be greatly reduced from the standard power consumption (Pb).Type: GrantFiled: October 1, 2009Date of Patent: December 6, 2011Assignee: Sony CorporationInventor: Kazuhiko Fujiie
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Patent number: 7940606Abstract: A signal detecting device includes: a semiconductor substrate; a near-field light generating section that is provided on the semiconductor substrate and generates near-field light near an interface with the semiconductor substrate; a light source that outputs light having wavelength corresponding to photon energy about a half as large as band-gap energy of a material of the semiconductor substrate; and a current detecting unit that detects a photocurrent generated in the semiconductor substrate when the near-field light is generated.Type: GrantFiled: June 9, 2009Date of Patent: May 10, 2011Assignee: Sony CorporationInventors: Ariyoshi Nakaoki, Naoto Kojima, Koji Sekiguchi, Osamu Kawakubo, Kazuhiko Fujiie
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Publication number: 20110019513Abstract: Directed to freely adjusting an emission period of a semiconductor laser. In the present invention, pulsed light serving as pulse-shaped laser light (LL) is emitted from a semiconductor laser (3), and a laser drive voltage (DJ) that is generated on the basis of a pulse signal (SL) and that has pulse-shaped drive voltage pulses (DJw) is applied to the semiconductor laser (3). At this time, a short-pulse light source (51) varies a voltage period (TV) corresponding to an interval between the drive voltage pulses (DJw), thereby varying a set period (TS) corresponding to an interval between generated signal pulses (SLw) in the pulse signal (SL).Type: ApplicationFiled: September 16, 2009Publication date: January 27, 2011Applicant: Sony CorporationInventors: Tsutomu Ishimoto, Kazuhiko Fujiie
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Publication number: 20100254249Abstract: The present invention realizes the emission of a high-output short-pulse beam and a reduction in power consumption. A laser control unit (2) of a short-pulse light-source device (1) raises a gate pulse (PG) of a gate signal (SG) supplied to a power supply circuit (5) in such a manner that the gate pulse (PG) rises only for the duration of an extremely short pulse width (T) to include the rise time of a generated pulse (PL) of a pulse signal (SL) supplied to a driving circuit (6). In this way, necessary power can be supplied at the rise timing of the generated pulse (PL), and the power consumption (Pa) can be greatly reduced from the standard power consumption (Pb).Type: ApplicationFiled: October 1, 2009Publication date: October 7, 2010Applicant: Sony CorporationInventor: Kazuhiko Fujiie
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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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Publication number: 20090310446Abstract: A signal detecting device includes: a semiconductor substrate; a near-field light generating section that is provided on the semiconductor substrate and generates near-field light near an interface with the semiconductor substrate; a light source that outputs light having wavelength corresponding to photon energy about a half as large as band-gap energy of a material of the semiconductor substrate; and a current detecting unit that detects a photocurrent generated in the semiconductor substrate when the near-field light is generated.Type: ApplicationFiled: June 9, 2009Publication date: December 17, 2009Applicant: Sony CorporationInventors: Ariyoshi Nakaoki, Naoto Kojima, Koji Sekiguchi, Osamu Kawakubo, Kazuhiko Fujiie
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Patent number: 7454771Abstract: An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam carried by a return light from the signal recording layer is detected to read the information signal recorded on the signal recording layer. The optical recording medium has a diameter of 65 mm or less and a thickness of 0.4 to 0.7 mm. An information signal recording area extends outwardly from a radial position of 12.5 mm or less from the center of the medium. The ratio in area between the information signal recording area and non-signal recording area is 3.4 or more. The storage capacity of this medium is 2 gigabytes or more. The optical recording medium has formed at the center thereof a center hole around which an annular table-abutment convexing to one side of the medium is formed.Type: GrantFiled: October 26, 2007Date of Patent: November 18, 2008Assignee: Sony CorporationInventors: Naohiro Netsu, Yoshitaka Aoki, Tetsu Watanabe, Kazuhiko Fujiie, Yasuaki Maeda, Takuya Kaeriyama
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Patent number: 7423939Abstract: A method for manufacturing a magneto-optical recording medium in which reading of recorded information is performed through domain wall displacement in a reproduction layer is provided, in which magnetic separation of groove side-wall portions is performed more reliably; as a result a magneto-optical recording medium with satisfactory recording and reproduction characteristics can be provided.Type: GrantFiled: February 13, 2004Date of Patent: September 9, 2008Assignee: Sony CorporationInventors: Takeshi Miki, Kazuhiko Fujiie, Yasuhito Tanaka, Goro Fujita, Tetsuhiro Sakamoto
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Publication number: 20080199602Abstract: A method for manufacturing a magneto-optical recording medium in which reading of recorded information is performed through domain wall displacement in a reproduction layer is provided, in which magnetic separation of groove side-wall portions is performed more reliably; as a result a magneto-optical recording medium with satisfactory recording and reproduction characteristics can be provided.Type: ApplicationFiled: April 21, 2008Publication date: August 21, 2008Inventors: Takeshi Miki, Kazuhiko Fujiie, Yasuhito Tanaka, Goro Fujita, Tetsuhiro Sakamoto
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Publication number: 20080098416Abstract: An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam carried by a return light from the signal recording layer is detected to read the information signal recorded on the signal recording layer. The optical recording medium has a diameter of 65 mm or less and a thickness of 0.4 to 0.7 mm. An information signal recording area extends outwardly from a radial position of 12.5 mm or less from the center of the medium. The ratio in area between the information signal recording area and non-signal recording area is 3.4 or more. The storage capacity of this medium is 2 gigabytes or more. The optical recording medium has formed at the center thereof a center hole around which an annular table-abutment convexing to one side of the medium is formed.Type: ApplicationFiled: October 26, 2007Publication date: April 24, 2008Applicant: Sony CorporationInventors: Naohiro NETSU, Yoshitaka AOKI, Tetsu WATANABE, Kazuhiko FUJIIE, Yasuaki MAEDA, Takuya KAERIYAMA
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Patent number: 7305689Abstract: An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam carried by a return light from the signal recording layer is detected to read the information signal recorded on the signal recording layer. The optical recording medium has a diameter of 65 mm or less and a thickness of 0.4 to 0.7 mm. An information signal recording area extends outwardly from a radial position of 12.5 mm or less from the center of the medium. The ratio in area between the information signal recording area and non-signal recording area is 3.4 or more. The storage capacity of this medium is 2 gigabytes or more. The optical recording medium has formed at the center thereof a center hole around which an annular table-abutment convexing to one side of the medium is formed.Type: GrantFiled: July 15, 2004Date of Patent: December 4, 2007Assignee: Sony CorporationInventors: Naohiro Netsu, Yoshitaka Aoki, Tetsu Watanabe, Kazuhiko Fujiie, Yasuaki Maeda, Takuya Kaeriyama
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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: 20070008832Abstract: A laser beam from an LD 11 is irradiated onto a magnetooptic disk 33 by a predetermined power for a heat treatment. After the heat treatment, the laser beam of a power smaller than the power upon heat treatment is irradiated to the heat-treated area. Reflection light of the laser beam of the small power enters photodetectors 24 and 26 and reflection light amounts of a P wave and an S wave are detected, respectively. A differential detecting circuit 27 detects a level of a magnetooptic signal corresponding to the heat-treated area on the basis of the reflection light amounts of the P wave and the S wave. A controller 28 determines whether or not the magnetooptic signal level detected by the differential detecting circuit 28 lies within a permissible range. If it is out of the range, the power of the laser beam to execute the heat treatment is adjusted and the process of a magnetooptic disk is stopped or a message showing such a fact is displayed, or the like.Type: ApplicationFiled: August 19, 2004Publication date: January 11, 2007Inventors: Yasuhito Tanaka, Takeshi Miki, Tetsuhiro Sakamoto, Goro Fujita, Kazuhiko Fujiie
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Patent number: 7060373Abstract: A magneto-optical recording medium includes a first magnetic layer (reproduction layer), a second magnetic layer (control layer), a third magnetic layer (blocking layer), and a fourth magnetic layer (recording layer) having respective Curie temperatures TC1, TC2, TC3 and TC4. The Curie temperatures of the layers satisfy the relationships TC1>TC3>TC2 and TC4>TC3. In addition, the magnetic anisotropy of the third magnetic layer Ku3 is greater than that of the second magnetic layer Ku2. A magnetic domain wall in the first magnetic layer in front of the spot irradiated by the reproduction light in the direction of travel is displaced toward the peak temperature portion so that a recorded domain is expanded. Displacement in the spot direction of a domain wall in the first magnetic layer behind the reproduction light spot in the direction of travel is suppressed. The second and third magnetic layers control the magnetic exchange coupling between the first and fourth magnetic layers.Type: GrantFiled: January 27, 2004Date of Patent: June 13, 2006Assignee: Sony CorporationInventors: Tetsuhiro Sakamoto, Kazutomo Miyata, Teruyuki Ota, Makoto Watanabe, Yasuhito Tanaka, Goro Fujita, Takeshi Miki, Kazuhiko Fujiie
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Publication number: 20050201211Abstract: The present invention is directed to an annealing apparatus adapted for performing anneal processing with respect to a magneto optical recording medium, which comprises a diffraction optical unit (3) for optically separating light beams emitted from a laser light source (1) into first light beams which are the 0 (zero)-th order diffracted light beams and second and third light beams which are the first order diffracted light beams, an object lens (5) for converging the first light beams to irradiate the first light beams thus converged onto magnetic layers of guide grooves or land portions forming both sides of the guide grooves, and for converging the second and third light beams to irradiate the second and third light beams thus converged onto magnetic layers in the vicinity of the boundary portions between guide grooves and land portions, and a biaxial actuator unit (6) for controlling the object lens (5) on the basis of linear characteristic of a first tracking error signal generated on the basis of intenType: ApplicationFiled: May 21, 2004Publication date: September 15, 2005Applicant: SONY CORPORATIONInventors: Goro Fujita, Takeshi Miki, Yasuhito Tanaka, Tetsuhiro Sakamoto, Kazuhiko Fujiie
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Patent number: 6944100Abstract: A magneto-optical recording/reproducing method is disclosed which causes a laser beam to be emitted to a disc recording medium having information recorded thereon earlier by magnetic field modulation, the laser beam causing the disc recording medium to develop a temperature distribution such as to generate a driving force for moving a domain wall of a magnetic domain in the medium so that the magnetic domain smaller in diameter than a spot of the laser beam is expanded sufficiently to let information recorded in the domain be detected. The method comprises the steps of: recording information to the disc recording medium while rotating the medium in a first rotating direction; and reproducing the information that was recorded to the disc recording medium in the recording step while rotating the medium in a second rotating direction reverse to the first rotating direction.Type: GrantFiled: March 11, 2003Date of Patent: September 13, 2005Assignee: Sony CorporationInventors: Tetsuhiro Sakamoto, Yasuhito Tanaka, Kazuhiko Fujiie