Patents by Inventor Takeshi Maeda

Takeshi Maeda 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).

  • Liquid crystal display device for displaying video data
    Patent number: 6850214
    Abstract: A luminance characteristic of inputted video data is determined by input video image characteristic detection sections, and polygonal line point master data and polygonal line point correction data are calculated based on the luminance characteristic so as to provide a satisfactory display state using a microcomputer and are outputted to the polygonal line generation sections. The polygonal line point data determining the output gradation characteristic is calculated in polygonal point generation sections and outputted to inter-point gradation operation sections, and operation processing is conducted by using the polygonal point data and the inputted video data in the inter-point operation sections to determine the inter-point gradation and outputted to a display panel.
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: February 1, 2005
    Assignees: Hitachi, Ltd., Hitachi Video and Information System, Inc., Hitachi Microsoftware Systems, Inc.
    Inventors: Shigeyuki Nishitani, Takeshi Maeda, Kazuyoshi Kawabe, Hiroshi Kurihara, Tetsuo Takagi, Toshiaki Ohashi
  • Information recording media, a method for recording/reproducing information, an apparatus for recording/reproducing information
    Publication number: 20050018567
    Abstract: A method of recording information by irradiating a recording track in an information recording medium with light, the information recording medium comprising a plurality of layers for the recording of information by light irradiation. Each of the layers comprises asperities made up of a groove, the groove in each of the multiple layers having wobbles of a first frequency and wobbles of a second frequency that is different from the first frequency within a single track, wherein the first frequency is constant in each of the layers, and wherein a different signal is obtained from the wobbles of the first and second frequencies in each of the plurality of layers.
    Type: Application
    Filed: August 19, 2004
    Publication date: January 27, 2005
    Inventors: Akemi Hirotsune, Harukazu Miyamoto, Takeshi Maeda
  • Information recording method and information recording apparatus
    Publication number: 20050007936
    Abstract: An information recording method and information recording apparatus is capable of resolving the trade-off relation between recording density and transmittance, wherein either the reproduction (playback) signal quality or the recording sensitivity is lowered. For this purpose, a voltage is applied by way of ball bearings or slip rings to a specified layer of a medium having multiple layers. The light transmittance of the recording layer is changed by application of this voltage. The tradeoff relationship between recording density and transmittance is eliminated thereby, and the recording density and transmittance levels are both improved, so as to enhance the recording reliability.
    Type: Application
    Filed: April 6, 2004
    Publication date: January 13, 2005
    Inventors: Motoyasu Terao, Katsuhiko Yamaguchi, Tadao Ino, Kyoko Kojima, Harukazu Miyamoto, Takeshi Maeda, Yuko Tsuchiya
  • Large capacity high speed read/write optical disk system
    Publication number: 20050007898
    Abstract: Library system having a structure with improved response. A library for storing multiple optical information media, and a unit installed with a read/write drive for storing multiple optical record media, and the optical record media inside the cassette in the unit is conveyed to the read/write drive, in which a plurality of units are installed in the library system, and the system contain a conveyance means between the library and the unit to convey optical record media stored in the library to the cassette inside the unit.
    Type: Application
    Filed: June 10, 2004
    Publication date: January 13, 2005
    Inventor: Takeshi Maeda
  • Hybrid cord for rubber reinforcement and rubber product employing the same
    Publication number: 20040226641
    Abstract: A hybrid cord 1 for rubber reinforcement comprises a strand 2 having higher elastic modulus, made of PBO fiber or the like, which is disposed at the center of the cord, and strands 3 having lower elastic modulus, made of glass fiber or the like, which are disposed therearound. The hybrid cord has enough strength and is excellent in flexural fatigue resistance, adhesion property relative to rubber, and dimensional stability. A rubber product employs this hybrid cord 1 for rubber reinforcement.
    Type: Application
    Filed: June 15, 2004
    Publication date: November 18, 2004
    Applicant: NIPPON SHEET GLASS CO., LTD.
    Inventors: Mitsuharu Akiyama, Takeshi Maeda, Yukinari Okuyama
  • Recording medium, information recording and reproducing method, and recording and reproducing apparatus
    Publication number: 20040202091
    Abstract: Conventionally, as in the case of switching between a DVD-R and a DVD-RAM, when the method of record mark arrangement in a track is changed, the physical format of the disk is also changed. This makes it difficult to ensure compatibility between pieces of data recorded by a plurality of different methods of record mark arrangement. According to the present invention, sector address data and block address data are recorded in each sector by using wobbling or deformation of a recording groove. Then, depending on which address is used, sector data structure is modified, thereby making it possible to select an address data detection and a data structure on a disk in a single physical format depending on the purpose.
    Type: Application
    Filed: May 3, 2004
    Publication date: October 14, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Hidehiko Kando, Harukazu Miyamoto, Takeshi Maeda
  • Liquid crystal driving device for controlling a liquid crystal panel and liquid crystal display apparatus
    Patent number: 6801178
    Abstract: A liquid crystal driving device for controlling a liquid crystal panel and a liquid crystal display apparatus. Reference voltages are generated in a data driver from input reference voltages, and reference voltages are selected in accordance with the settings of gray scale control registers thereby to control the gray scale voltages.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: October 5, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Nitta, Tsutomu Furuhashi, Makoto Kimura, Hirobumi Koshi, Takeshi Maeda
  • Information recording medium which indicates information according to the wobbling of a track and information recording and reproducing apparatus
    Patent number: 6791921
    Abstract: An information reproducing apparatus includes a rotating portion to rotate an information recording medium on which information has been recorded by wobbling borders on both sides of a track with different phases; a beam irradiating portion for irradiating a beam spot on the track of the information recording medium; a photodetector for receiving a reflected beam of the beam spot from the information recording medium; a detector for detecting a composite waveform including waveforms on the borders on both sides from the received beam intensity of the photodetector; a phase change detector for detecting changes in the phase of wobbling waveforms on the borders on both sides from the composite waveform; and an information reproducer for reproducing information corresponding to detection result of the phase change detector by using a predetermined relation between phase changes and information.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: September 14, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Takeshi Maeda, Harukazu Miyamoto
  • Information recording medium and information reproduction method
    Publication number: 20040174792
    Abstract: There are provided parts where respective addresses of grooves on both sides of a land are identical to each other, and selection marks indicating validity of the parts are disposed. The selection marks determines the validity by taking advantage of the fact that there occurs a difference in wobble waveform in the land between a case of wobble data of the grooves on both sides of the land are identical and a case of the wobble data differ from each other. In this case, the wobble address method having an advantageous format efficiency can be used in combination with land/groove recording capable of narrowing down tracks, so that a reproduction method using a large capacity optical disc capable of high-density recording can be implemented.
    Type: Application
    Filed: August 13, 2003
    Publication date: September 9, 2004
    Inventors: Harukazu Miyamoto, Hiromi Kudo, Takeshi Maeda
  • Recording medium, information recording and reproducing method, and recording and reproducing apparatus
    Patent number: 6754152
    Abstract: Conventionally, as in the case of switching between a DVD-R and a DVD-RAM, when the method of record mark arrangement in a track is changed, the physical format of the disk is also changed. This makes it difficult to ensure compatibility between pieces of data recorded by a plurality of different methods of record mark arrangement. According to the present invention, sector address data and block address data are recorded in each sector by using wobbling or deformation of a recording groove. Then, depending on which address is used, sector data structure is modified, thereby making it possible to select an address data detection and a data structure on a disk in a single physical format depending on the purpose.
    Type: Grant
    Filed: March 13, 2001
    Date of Patent: June 22, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Hidehiko Kando, Harukazu Miyamoto, Takeshi Maeda
  • Optical disk apparatus
    Publication number: 20040105372
    Abstract: Light emitted from a laser is divided into two light waves so that the ratio of the power of one light wave to the power of the other will be appropriate. The resultant light waves are irradiated to the same track on a medium. The preceding spot is used for erasure, and modulated so that the same pattern as the one formed with a recording pulse will be formed. The high-power component of the modulated light of the erasing spot causes the temperature of a recording layer to be equal to or higher than the melting point. The medium-power component of the modulated light forms a crystallizing temperature area on the recording layer. A liquid crystal diffraction grating is used to divide power, and a power division ratio is variable and controllable.
    Type: Application
    Filed: November 17, 2003
    Publication date: June 3, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Toshimichi Shintani, Harukazu Miyamoto, Takeshi Maeda, Takeshi Shimano, Takahiro Kurokawa
  • Optical disk having a plurality of information recording units
    Patent number: 6728197
    Abstract: In the recordable type multilayer optical disk, locations of an information recording unit region and of ID or address data of adjacent plural tracks on a recording medium are configured so as to be shifted in the circumferential direction by 5 &mgr;m or more. Since an effect from a layer that is not selected can be remarkably reduced, multilayer recording/reproducing can be realized. Moreover, ID or address data do not center at the same position in reference to the circumferential direction, the effect of distortion that is generated on the disk substrate and the recording layer at the time of optical disk formation or multiple overwriting can be minimized, and design and fabrication tolerances of the optical disk are extended, and, as a result, the media can be provided with a low cost.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: April 27, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Harukazu Miyamoto, Takeshi Maeda, Toshimichi Shintani, Takahiro Kurokawa, Tetsuo Ariyoshi, Hirofumi Sukeda
  • Optical information reproducing method for reproducing information by generating a signal representing a center of a mark
    Patent number: 6717898
    Abstract: An optical information reproducing method for reproducing information recorded at at least one mark on an optical information medium. The method includes irradiating a laser to the optical information medium, detecting a reflected beam reflected from the optical information medium, and reproducing information recorded on the optical information medium from an output signal of a detector which detects the reflected beam. The step of reproducing information is changed in dependence upon a length of the mark of the optical information medium.
    Type: Grant
    Filed: May 13, 2003
    Date of Patent: April 6, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Shigeru Nakamura, Takeshi Maeda, Koichiro Wakabayashi
  • Handheld type four-cycle engine
    Patent number: 6705263
    Abstract: In a handheld type four-cycle engine, a valve operation mechanism includes a camshaft rotatably supported in a cylinder head so as to open and close an intake valve and an exhaust valve and a timing transmission placed on one side outside an engine main body and providing association between a crankshaft and the camshaft, and a centrifugal clutch for power output is mounted on the crankshaft on the opposite side outside the engine main body. The timing transmission and the centrifugal clutch being positioned at the two ends of the crankshaft improves the weight balance, the centre of gravity of the engine can be made as close to the central part of the crankshaft as possible, which, together with the reduced weight, can enhance the operability of the engine.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: March 16, 2004
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Keita Ito, Koji Kasai, Takao Nishida, Yasuhiro Shimizu, Takeshi Maeda, Yasutake Ryu
  • Information recording method, information recording medium, and information recording apparatus
    Publication number: 20040042367
    Abstract: An information recording method using a recording medium having a first state by a first power level of an energy beam and a second state by a second power level of the energy beam higher than the first power level. When a period of a recording time generating clock in a recording mode is T, and a relative velocity of the energy beam and the recording medium is V, the method includes forming a sequence of the second state with length avT (first mark), the first state with length ivT (first space) following the first mark, the second state with length mvT (second mark) following the first space, the first state with length jvT (second space) following the second mark and the second state with length bvT (third mark) following the second space as a first small recording pattern.
    Type: Application
    Filed: September 5, 2003
    Publication date: March 4, 2004
    Inventors: Hidehiko Kando, Takeshi Maeda, Hiroyuki Minemura, Tsuyoshi Toda, Yasushi Miyauchi, Mitsuhide Miyamoto
  • Liquid crystal display control device
    Publication number: 20040027324
    Abstract: There is provided a liquid crystal display control device which can display pictures in a magnification mode by using only a memory having low-speed access and a low storage capacity. When a video signal has intermediate resolution or less, the enlargement processing is performed by a frame memory, a line memory and an enlargement processing control circuit. If the input operation and the output operation to and from the frame memory are synchronized with each other, it is sufficient for the frame memory to have a storage capacity of two lines. When the video signal has the same high resolution as a liquid crystal display panel, the video signal is output through a gate circuit to a display timing generating circuit, and it is displayed in a through mode. In this case, no processing is performed by the frame memory or the like.
    Type: Application
    Filed: August 5, 2003
    Publication date: February 12, 2004
    Inventors: Tsutomu Furuhashi, Takeshi Maeda, Atsuhiro Higa, Hisayuki Ohhara, Hiroshi Kurihara, Naruhiko Kasai
  • Information recording/reproducing apparatus and method and information recording medium
    Patent number: 6680888
    Abstract: An information recording/reproducing apparatus includes a detector circuit for detecting a state of reflection light from the recording medium, a control circuit for calculating a radiation power used for writing the information in the recording medium, in accordance with the reflection light state, a pulse generator circuit for generating record pulse information in accordance with the radiation power, and an optical driver circuit for converting the record pulse information into optical information in accordance with the radiation power and driving the optical head to record the light information into the recording medium. Accordingly, the apparatus records information by applying light from an optical head to a record area of a recording medium and changing a state of the record area and reads the information recorded in the record area.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: January 20, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Tsuyoshi Toda, Shigeru Nakamura, Takeshi Maeda
  • Information recording method, information recording medium and information recording apparatus
    Patent number: 6678225
    Abstract: A recording medium for use with an information recording apparatus which has a timing adjusting controller to adjust a timing of a recording pulse having a disk-like substrate. At least one track is provided on the disk-like substrate and a zone is provided which includes the at least one track. The zone stores information relating to a predetermined timing of a pulse for the recording medium which is detected by the apparatus.
    Type: Grant
    Filed: January 29, 2002
    Date of Patent: January 13, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Takeshi Maeda, Hirofumi Sukeda, Hiroyuki Minemura, Hidehiko Kando, Makoto Miyamoto
  • Information media, recording and reading apparatus
    Publication number: 20040004926
    Abstract: In a method of recording information by varying the front- and rear-edge positions of a mark by integer multiples of a specific interval, the recording density is increased without narrowing the intervals of edge position variation and without being influenced by the detection dynamic range. A data cell is divided at specific intervals &Dgr;, and the front- and rear-edge positions of the mark are disposed at any desired positions at specific intervals &Dgr;. Thus the mark length and the number of positions the mark can take can be increased, so that the recording density can be increased with the same margin as that of the prior art.
    Type: Application
    Filed: January 22, 2003
    Publication date: January 8, 2004
    Inventor: Takeshi Maeda
  • Information recording disk
    Patent number: RE38503
    Abstract: An information recording disk having a structure that a ring-shaped recording region is divided into a plurality of concentric, annular blocks, each of the blocks is divided in a circumferential direction into a plurality of equal sectors, and a recording track and a pit train for generating a header signal are previously formed in the recording region so that the recording density of a block increases as the block is nearer to the outer circumference of the recording region, in comparison with constant angular velocity type, is disclosed in which disk the recording region has a portion where blocks are pre-formatted so that the pit pitch of the header-signal generating pit train formed on the innermost recording track of the outer one of two adjacent blocks is greater than the pit pitch of the header-signal generating pit train formed on the innermost recording track of the inner block.
    Type: Grant
    Filed: September 5, 2001
    Date of Patent: April 20, 2004
    Assignees: Hitachi Maxell, Ltd., Hitachi, Ltd.
    Inventors: Tamotsu Iida, Shinichi Arai, Takeshi Maeda