Patents by Inventor Kenji Narumi

Kenji Narumi 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).

  • Publication number: 20090067308
    Abstract: A recording pulse for driving a laser is formed so that a length of a recorded mark on a recording medium corresponds to a recording code length of data; the recording pulse is formed as a recording pulse train having pulse heights corresponding to a plurality of power levels including a recording power and an erasure power; the recording pulse train is composed of a plurality of pulses including a multi-pulse and a trailing pulse; and the recording medium at a plurality kinds of linear velocities is irradiated with laser light based on the recording pulse to form the mark. When linear velocities v1 and v2 are in a relationship that v1<v2, the following formulas are satisfied: (TL1/Tw1)<(TL2/Tw2), and ((TM2/Tw2)/(TM1/Tw1))<((TL2/Tw2)/(TL1/Tw1)), where Tw1, Tw2: channel dock periods at the linear velocities v1, v2, TL1, TL2: trailing pulse widths at the linear velocities v1, v2, TM1, TM2: multi-pulse widths at the linear velocities v1, v2.
    Type: Application
    Filed: November 13, 2008
    Publication date: March 12, 2009
    Applicant: PANASONIC CORPORATION
    Inventors: Kenji Narumi, Tomiharu Hosaka
  • Patent number: 7450480
    Abstract: A recording and reproducing method is provided in which information can be recorded and reproduced correctly using a simple circuit structure, even with a high transfer rate, and a test record can be performed efficiently in a short time. A laser driving circuit 6 makes power levels of a front end pulse and a rear end pulse different from a power level of a middle pulse, and a record signal edge correction circuit 5 corrects an edge position of a recording pulse.
    Type: Grant
    Filed: May 25, 2004
    Date of Patent: November 11, 2008
    Assignee: Panasonic Corporation
    Inventors: Kenji Narumi, Naoyasu Miyagawa
  • Publication number: 20080247305
    Abstract: An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions.
    Type: Application
    Filed: April 11, 2008
    Publication date: October 9, 2008
    Inventors: Kenji NARUMI, Kenichi Nishiuchi
  • Publication number: 20080219116
    Abstract: It is an object to be able to record data with good signal quality over a wide range of linear velocities to an optical information recording medium. To achieve the stated object, in a laser drive circuit (5) of an optical information recording apparatus, the ratio of recording power to the power at which the reproduction signal quality reaches a threshold value is set to be relatively low at low velocities, and relatively high at high velocities.
    Type: Application
    Filed: June 17, 2005
    Publication date: September 11, 2008
    Inventor: Kenji Narumi
  • Publication number: 20080212447
    Abstract: An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions.
    Type: Application
    Filed: April 11, 2008
    Publication date: September 4, 2008
    Inventors: Kenji NARUMI, Kenichi Nishiuchi
  • Publication number: 20080212428
    Abstract: An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions.
    Type: Application
    Filed: April 11, 2008
    Publication date: September 4, 2008
    Inventors: Kenji NARUMI, Kenichi Nishiuchi
  • Publication number: 20080212458
    Abstract: An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions.
    Type: Application
    Filed: April 11, 2008
    Publication date: September 4, 2008
    Inventors: Kenji Narumi, Kenichi Nishiuchi
  • Publication number: 20080198713
    Abstract: An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions.
    Type: Application
    Filed: April 11, 2008
    Publication date: August 21, 2008
    Inventors: Kenji NARUMI, Kenichi Nishiuchi
  • Publication number: 20080198714
    Abstract: An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions.
    Type: Application
    Filed: April 11, 2008
    Publication date: August 21, 2008
    Inventors: Kenji NARUMI, Kenichi Nishiuchi
  • Publication number: 20080198712
    Abstract: An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions.
    Type: Application
    Filed: April 11, 2008
    Publication date: August 21, 2008
    Inventors: Kenji NARUMI, Kenichi Nishiuchi
  • Patent number: 7376058
    Abstract: An optical information recording medium according to the present invention includes a first information recording layer on which information is to be recorded by laser light; and a second information recording layer on which information is to be recorded by the laser light which has passed through the first information recording layer. The first information recording layer includes at least one of a reproduction-only area and a recording and reproduction area. The second information recording layer includes a test recording area. At least one of the reproduction-only area and the recording and reproduction area, and the test recording area is located such that one of the reproduction-only area and the recording and reproduction area includes an area of the first information recording layer through which the laser light for recording information in the test recording area passes.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: May 20, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Narumi, Kenichi Nishiuchi
  • Publication number: 20080074980
    Abstract: An information recording medium according to the present invention includes a plurality of recording layers, and a test area for determining a recording power of a laser light for each of the plurality of recording layers, in which a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions.
    Type: Application
    Filed: September 19, 2007
    Publication date: March 27, 2008
    Inventors: Kenji NARUMI, Kenichi Nishiuchi
  • Publication number: 20080043592
    Abstract: The present invention provides an optical information recording apparatus and method capable of effectively determining appropriate recording parameters in a short time with favorable efficiency, when recording information onto an optical disk having different information recording conditions and information recording characteristics. An information recording condition or an information recording characteristic of an optical disk 1 is identified, and a recording pulse position is corrected at a correction accuracy according to the identifies information recording condition or information recording characteristic, such that a recording mark is formed in a predetermined position.
    Type: Application
    Filed: October 10, 2007
    Publication date: February 21, 2008
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Narumi, Kenichi Nishiuchi, Shigeaki Furukawa
  • Patent number: 7193948
    Abstract: An optical recording medium of the present invention includes a substrate (202), a protection plate (205), and a plurality of information layers (203) sandwiched between the substrate and the protection plate. An information signal is recorded as a length of a mark and a length of a space between two marks. The mark is formed when the information layer is irradiated by light received through the substrate. The information layers have a management region (206) recording a leading edge recording condition and a trailing edge recording condition. The leading edge recording condition is used to change a recording start position for forming a leading edge of the mark. The trailing edge recording condition is used to change a recording end position for forming a trailing edge of the mark. Each of the leading and trailing edge recording condition is depending on which information layer is recorded.
    Type: Grant
    Filed: October 3, 2001
    Date of Patent: March 20, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shigeaki Furukawa, Kenichi Nishiuchi, Tetsuya Akiyama, Kenji Narumi
  • Patent number: 7193947
    Abstract: An edge position of a recording pulse is corrected according to multi-valued information for determining the width of a mark in an edge position correction circuit, thereby it is possible to form a mark edge in a correct position when a mark with any width is to be corrected to enable a correct multi-valued recording/reproducing.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: March 20, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Narumi, Kenichi Nishiuchi, Noboru Yamada, Takeo Ohta
  • Patent number: 7158458
    Abstract: A method and an apparatus are provided, which enable a user's standby time to be shortened or utilized effectively in the course of recording/reproduction of information with respect to an optical disk. Information recorded on a disk is reproduced preferentially, and after counting for a predetermined period of time, recording learning is conducted. Alternatively, management information is reproduced preferentially over recording learning, and recording learning is conducted while a user is confirming this information. Alternatively, the possibility of recording on a disk is identified, and reproduction preference or recording learning preference processing is conducted based the possibility. Alternatively, a rotation speed of a disk is controlled to be variable or constant, based on the possibility of recording.
    Type: Grant
    Filed: April 5, 2005
    Date of Patent: January 2, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shigeaki Furukawa, Kenichi Nishiuchi, Tetsuya Akiyama, Kenji Narumi, Takashi Ishida, Mamoru Shoji, Atsushi Nakamura, Shunji Ohara
  • Publication number: 20060280109
    Abstract: The object of the present invention is to make an appropriate determination of whether recording is prohibited or not depending on the type of record/reproduce apparatus. To achieve the object, optical disk 1 of the present invention that can record or reproduce information through irradiation with laser light comprises a recording area 6 for recording the information, and a management area for recording management information of the optical disk 1, wherein the management area includes a recordable write-inhibit flag area 7 with a record/reproduce apparatus, and at least two types of the identifying information that are independent one another and identify whether recording is prohibited or not respectively for at least two recording linear velocities are recorded in the write-inhibit flag area 7.
    Type: Application
    Filed: June 12, 2006
    Publication date: December 14, 2006
    Inventors: Kenji Narumi, Kenji Koishi, Kouhei Akimoto, Kenichi Nishiuchi
  • Patent number: 7116623
    Abstract: An optical information recording device includes a linear velocity setting circuit for setting a first linear velocity v1 and a second linear velocity v2 higher than the first linear velocity v1 for a optical information recording medium, a recording pulse generation circuit for generating a recording pulse signal, depending on the setting by the linear velocity setting circuit, and a laser drive circuit for irradiating the medium with the laser light based on the recording pulse signal generated by the recording pulse generation circuit.
    Type: Grant
    Filed: October 28, 2003
    Date of Patent: October 3, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Narumi, Naoyasu Miyagawa, Kenichi Nishiuchi
  • Patent number: 7088656
    Abstract: A method by which, in an optical disk recording and reproducing device, the time required for a test recording performed prior to an actual information recording can be reduced according to characteristics of an optical disk. A random pattern signal is transmitted from a random pattern signal generating circuit 3 and recorded on a test track on an optical disk 1, and a bit error rate of a reproduction signal is measured. Only when a value of the bit error rate is not less than a fixed value, test pattern signals are transmitted from a test pattern signal generating circuit 4 and recorded. An edge timing of a reproduction signal is measured by an edge timing detecting circuit 13. Based on a result of the measurement, edge positions of a front-end pulse and a back-end pulse are corrected.
    Type: Grant
    Filed: February 15, 2005
    Date of Patent: August 8, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Narumi, Tetsuya Akiyama, Kenichi Nishiuchi, Shigeaki Furukawa
  • Patent number: 7020065
    Abstract: The present invention relates to an optical information recording medium including a disk-shaped transparent substrate and a recording layer for recording, reproducing or erasing information by irradiation of laser light, the recording layer being formed over the substrate. The recording layer of the present invention includes information tracks including groove tracks and land tracks that are formed alternately in a radial direction of the disk. The information tracks comprise information recording regions and address regions interposed between the information recording regions, the information recording regions and the address regions being arranged along the tracking direction of the laser light.
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: March 28, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tetsuya Akiyama, Kenichi Nishiuchi, Kenji Narumi