Patents by Inventor Kenji Koishi

Kenji Koishi 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).

  • Patent number: 6490302
    Abstract: A semiconductor laser control circuit of the invention can modulate a light power level among a plurality of set levels including a first level, a second level lower than the first level, and a third level lower than the first level but higher than the second level.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: December 3, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Koishi, Kohjyu Konno
  • Patent number: 6480960
    Abstract: A barcode is formed on an optical disk. An optical disk is provided which has a control data area and an identifier for indicating the presence or absence of the barcode in the control data area. A beam pattern is focused on a reflective film of the optical disk in an information signal region on which data is recorded. The optical disk is rotated to form the barcode.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: November 12, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Patent number: 6470452
    Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: October 22, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Patent number: 6457128
    Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: September 24, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Patent number: 6449366
    Abstract: A barcode is formed on an optical disk. The optical disk is provided with a control data area and an identifier for indicating the presence or absence of the barcode in the control data area. A beam pattern if focused on a reflective film of the optical disk in an information signal region on which the data is recorded. Information is provided for making the barcode. The information is PE-modulated so that a width of a mark of the barcode is half or less than a period of the barcode marks. The optical disk is rotated to form the barcode.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: September 10, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Publication number: 20020097871
    Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
    Type: Application
    Filed: February 20, 2002
    Publication date: July 25, 2002
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Publication number: 20020089920
    Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
    Type: Application
    Filed: February 4, 2002
    Publication date: July 11, 2002
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Publication number: 20020080961
    Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. Then playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
    Type: Application
    Filed: February 20, 2002
    Publication date: June 27, 2002
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Patent number: 6408285
    Abstract: A device for reading encrypted information from an optical disk having first and second recording areas, which device can read encrypted information recorded by a first modulation method in the first recording area, read disk identification information recorded by a second modulation method in the second recording area, and decrypt the encrypted information using both a decipher key and disk identification information unique to the optical disk.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: June 18, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuaki Oshima, Yoshino Gotoh, Shinichi Tanaka, Kenji Koishi, Mitsurou Moriya, Yoshinari Takemura
  • Publication number: 20020073038
    Abstract: The operating and other procedures of an optical disk application system of the type for which a network is used are simplified. Optical disks have auxiliary data recording areas, where different IDs for individual disks, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.
    Type: Application
    Filed: December 30, 1999
    Publication date: June 13, 2002
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: MITSUAKI OSHIMA, YOSHIHO GOTOH, SHINICHI TANAKA, KENJI KOISHI, MITSUROU MORIYA, YOSHINARI TAKEMURA
  • Publication number: 20020070282
    Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
    Type: Application
    Filed: February 4, 2002
    Publication date: June 13, 2002
    Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
  • Publication number: 20020070329
    Abstract: Playback signal amplitude drops and continuity of the signal track amplitude is lost at the beginning the data recording area when data is incrementally written to optical discs such as DVD-R or DVD-RW media. Feed-forward control quickly settles semiconductor laser recording power to the target power level immediately after an incremental recording starts. While recording continues, feedback control maintains laser power at a desired recording power level even when the required current supply varies due to the temperature characteristics of the semiconductor laser when recording lasts for an extended period of time. A semiconductor laser control method and semiconductor laser control device thereby maintain laser power at a stable target recording power level quickly and for as long as recording continues.
    Type: Application
    Filed: October 24, 2001
    Publication date: June 13, 2002
    Inventors: Kenji Koishi, Yoshiyuki Miyabata, Makoto Usui, Kohjyu Konno, Yasuhiro Ueki, Tomonori Ueno, Yutaka Osada, Toru Fujimoto
  • Publication number: 20020067676
    Abstract: To accurately detect whether the information is being recorded on a correct track and improve the reliability during recording. The invention relates to an optical disc apparatus for reading the address information from an optical disc which has tracks and track spaces formed between tracks. The apparatus comprises an optical head which irradiates the disc with light and includes tracking detectors, divided into a first detector and a second detector in a track direction, detecting the reflecting light from the disc and outputting detection signals, an adjusting circuit which adjusts amplitudes of the first and second detection signals and outputting the signals at a position where the address information is recorded, a differential amplifying circuit which outputs the differential signal which is the difference between the first and the second detection signals adjusted, and an address detecting circuit which detects the address information based on the differential signal.
    Type: Application
    Filed: November 14, 2001
    Publication date: June 6, 2002
    Inventors: Chikashi Inokuchi, Kenji Koishi, Kohjyu Konno, Yutaka Osada, Mitsuhiko Oohta, Takashi Kawai
  • Patent number: 6381588
    Abstract: The operating and other procedures of an optical disk application system of the type for which a network is used are simplified. Optical disks have auxiliary data recording areas, where different IDs for individual disks, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: April 30, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuaki Oshima, Yoshiho Gotoh, Shinichi Tanaka, Kenji Koishi, Mitsurou Moriya, Yoshinari Takemura
  • Publication number: 20020049678
    Abstract: The operating and other procedures of an optical disk application system of the type for which a network is used are simplified. Optical disks have auxiliary data recording areas, where different IDs for individual disks, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.
    Type: Application
    Filed: September 28, 2001
    Publication date: April 25, 2002
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Mitsuaki Oshima, Yoshiho Gotoh, Shinichi Tanaka, Kenji Koishi, Mitsurou Moriya, Yoshinari Takemura
  • Publication number: 20020046177
    Abstract: The operating and other procedures of an optical disk application system of the type for which a network is used are simplified. Optical disks have auxiliary data recording areas, where different IDs for individual disks, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.
    Type: Application
    Filed: July 31, 2001
    Publication date: April 18, 2002
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Mitsuaki Oshima, Yoshiho Gotoh, Shinichi Tanaka, Kenji Koishi, Mitsurou Moriya, Yoshinari Takemura
  • Publication number: 20020036961
    Abstract: Multi-pulse trains of a forward laser beam are applied to an optical disc to record mark areas thereon. The multi-pulse trains correspond to the mark areas respectively. The multi-pulse trains represent information to be recorded. Detection is made as to an intensity of a reflected laser beam which results from reflection of the forward laser beam by the optical disc. The detected intensity is divided by a setting intensity to get a division result. A condition of recording of each of the mark areas is detected in response to the division result. An amplitude of each of the multi-pulse trains is controlled in response to the detected condition.
    Type: Application
    Filed: September 4, 2001
    Publication date: March 28, 2002
    Inventors: Hideharu Eguchi, Yasuhiro Ueki, Osamu Yanagisawa, Yutaka Osada, Kenji Koishi, Makoto Usui, Kohjyu Konno, Yuuichi Kamioka
  • Patent number: 6343282
    Abstract: A device for reading encrypted information recorded on an optical disk having first and second recording areas, the device can read disk identification information recorded in the second recording area, select a specific decipher key among multiple decipher keys, and decrypt encrypted information from the optical disk using both the disk identification information unique to that optical disk and the specific decipher key.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: January 29, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuaki Oshima, Yoshiho Gotoh, Shinichi Tanaka, Kenji Koishi, Mitsurou Moriya, Yoshinari Takemura
  • Patent number: 6339579
    Abstract: In an optical disc apparatus, a semiconductor SLD driving device is mounted on an optical pickup in order to realize a high speed switching of drive current for a semiconductor laser diode (SLD), necessary for recording data. The SLD is placed. within 5 cm from the SLD driving device. The driving device becomes a heat source due to driving current of the SLD, and increases a temperature of the optical pickup. Since the temperature rises proportionally to power consumption, power saving is required. A voltage supplied to the driving device is controlled to be a minimum level necessary for keeping the driving device still working on basic functions. The SLD driving device is mounted to the optical pickup, and this driving device handles N pieces of input signals for setting semiconductor laser power and N pieces of switch-timing-input-signals for selecting respective input signals.
    Type: Grant
    Filed: April 7, 1999
    Date of Patent: January 15, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yuichi Kamioka, Kenji Koishi, Yoshiyuki Miyabata, Naoyuki Nakamura, Kenichi Tatehara, Ikuo Hidaka, Kiyoshi Nakamori
  • Publication number: 20010055132
    Abstract: The operating and other procedures of an optical disk application system of the type for which a network is used are simplified. Optical disks have auxiliary data recording areas, where different IDs for individual disks, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.
    Type: Application
    Filed: November 30, 1999
    Publication date: December 27, 2001
    Inventors: MITSUAKI OSHIMA, YOSHIHO GOTOH, SHINICHI TANAKA, KENJI KOISHI, MITSUROU MORIYA, YOSHINARI TAKEMURA