Patents by Inventor Tomio Yoshida

Tomio Yoshida 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: 5444645
    Abstract: Pseudo random pattern generators (1.sub.1 through 1.sub.m) of respective channels generate pseudo random patterns on the basis of the same n-order generator polynomial. A pseudo random pattern calculating part calculates data X(t.sub.1), X(t.sub.2), . . . , X(t.sub.m), . . . , X(t.sub.pm) that are generated at times t.sub.1, t.sub.2, . . . , t.sub.m, . . . , t.sub.pm at intervals z.sub.k and loads them as initial values in an initial value table in the case where a pseudo random pattern is generated by a pseudo random pattern generator identical in construction with the pseudo random pattern generator of each channel. Initial value data of one of such p sets of initial values are set in the pseudo random pattern generators (1.sub.1 through 1.sub.m) of the respective channels, after which the generation of a pseudo random pattern is started.
    Type: Grant
    Filed: October 14, 1993
    Date of Patent: August 22, 1995
    Assignee: Advantest Corporation
    Inventors: Tomio Yoshida, Kazuhiro Shimawaki
  • Patent number: 5434807
    Abstract: A generating polynomial and a parallel bit number p are input via an input part 21. In an operating control part 22, a k-th power A.sup.k of a characteristic polynomial of a pseudo-random pattern is obtained, then a matrix N.sup.k with rows corresponding to p bits of the k-th power A.sup.k and (n-p) columns not corresponding to the p bits on the said rows is obtained, and then k is obtained for which the rank of the matrix N.sup.k is p. A parallel pattern of p bits from p shift stages of a pseudo-random pattern generator having n shift stages is selected and held by a select/hold part 26. A drive control part 24 drives the select/hold part 26 to output the p-bit parallel pattern each time the pseudo-random pattern generator performs a k-bit shift operation.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: July 18, 1995
    Assignee: Advantest Corporation
    Inventor: Tomio Yoshida
  • Patent number: 5408617
    Abstract: An inter-system communication system makes a communication between at least two operating systems. The inter-system communication system includes a virtual machine control program for generally controlling at least first and second operating systems, a data transfer mechanism provided in the virtual machine control program, a request part provided in each of the first and second operating systems for transmitting a transfer request to the data transfer mechanism, and a main storage region provided in each of the first and second operating systems and having a buffer region. The data transfer mechanism transfers data between the buffer region within the main storage region of the first operating system and the buffer region within the main storage region of the second operating system in response to a transfer request from the request part of one of the first and second operating systems.
    Type: Grant
    Filed: April 13, 1992
    Date of Patent: April 18, 1995
    Assignee: Fujitsu Limited
    Inventor: Tomio Yoshida
  • Patent number: 5216657
    Abstract: A method and an apparatus for recording information signals on an optical information recording medium which is reversibly changeable between optically distinguishable states corresponding to an irradiating condition of a bundle of high density energy such as laser beam. The starting point of recording signals is randomly changed, and the thermal history of the recording material by the beam irradiation is averaged and the number of repetition recording times is improved. A delay circuit is provided, and reference recording gate signals are formed on the basis of format signals obtained from a recording medium, and a random delay time is set just thereafter, and the starting point of recording of recording signals is started.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: June 1, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenichi Nishiuchi, Noboru Yamada, Nobuo Akahira, Kazutoyo Hirosawa, Tomio Yoshida, Shinji Kubota
  • Patent number: 5131273
    Abstract: An angular velocity sensor includes a pair of vibratory piezoelectric detecting elements defining detecting planes which are disposed in symmetry about a plane containing the sense axis and out of right-angled orientation with respect to this plane. The detecting elements thus arranged assume a widely spread or flattened V-shaped configuration as viewed from above. Output signals of opposite polarities received from the respective detecting elements are weighted respectively and added together so as to cancel out unwanted leak component signals. Thus, leak component signals resulting from assembling tolerances can be canceled. In this instance, if the characteristics of two sensor elements each including one of the detecting elements are fully equivalent, a leak component signal dependent on a disturbing inertial force can simultaneously be canceled out.
    Type: Grant
    Filed: July 6, 1990
    Date of Patent: July 21, 1992
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Munehiro Tabata, Suzushi Kimura, Tadashi Kawamata, Tsunenori Yoshida, Tomio Yoshida
  • Patent number: 5119363
    Abstract: In an optical recording disk having groove-like guide tracks, a rotation index mark is provided to indicate a rotation starting point where the rotation index mark is constructed of a grooved-like phase structure. The rotation index mark may be formed in a track which is located separated from the information recording tracks, and may be detected optically without using a laser light beam. The rotation index mark is used to control the rotation of the disk as well as writing and reading operation of an optical disk recording/reproducing apparatus so that various information, such as video signals, can be accurately recorded and reproduced. In the case of recording digital signals, the guide tracks may be divided into a plurality of sector regions, and sector index marks corresponding to respective sector regions may also be formed together with the rotation index mark. Furthermore, an address index mark indicative of the position of track address region radially formed in the guide tracks may also be added.
    Type: Grant
    Filed: December 16, 1981
    Date of Patent: June 2, 1992
    Assignee: Matsushita Electric Industrial Company, Ltd.
    Inventors: Isao Satoh, Tomio Yoshida, Shunji Ohara, Kenji Koishi
  • Patent number: 4912519
    Abstract: There is provided a laser speckle velocity-measuring apparatus comprising: a semiconductor laser to irradiate the light to a moving object; first and second photo sensing devices whose light receiving points are arranged in the moving direction of the objects at a predetermined distance so as to be away from each other; a clock signal generating and control circuit for determining a clock frequency of the clock signal so that the number of clocks of the clock signal is always set to a constant value when the delay time of the photo sensing signal of the second photo sensing device for the photo sensing signal of the first photo sensing device is measured by the clock signals; and an arithmetic operating circuit for counting the clock signals and calculating the length, moving distance, or velocity of the object on the basis of the count value.
    Type: Grant
    Filed: June 17, 1988
    Date of Patent: March 27, 1990
    Assignee: Omron Tateisi Electronics Co.
    Inventors: Tomio Yoshida, Nobuo Nakatsuka, Hiroshi Kitajima, Tsukasa Yamashita
  • Patent number: 4880874
    Abstract: A resin composition comprising(A) 10 to 99% by weight of a polycarbonate resin and(B) 90 to 1% by weight of a resin which comprises(b-1) 100 to 10% by weight of a copolymer which is obtainable by polymerizing 1 to 800 parts by weight of an unsaturated epoxy monomer and 0 to 2,000 parts by weight of other copolymerizable monomer in the presence of 100 parts by weight of an ethylene-.alpha.-olefin base rubber, and(b-2) 0 to 90% by weight of a copolymer which is obtainable by polymerizing at least one monomer selected from the group consisting of aromatic vinyl compounds, cyanated vinyl compounds and alkyl unsaturated carboxylates.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: November 14, 1989
    Assignee: Sumitomo Naugatuck Co., Ltd.
    Inventors: Mikio Hirai, Tokuo Tatsuda, Tomio Yoshida
  • Patent number: 4855355
    Abstract: A molding resin composition comprising (A) a saturated polyester resin, (B) a graft copolymer and (C) a rubber-reinforced resin, wherein a weight ratio of the saturated polyester resin (A) to a total weight of the graft copolymer (B) and the rubber-reinforced resin (C) is from 95:5 to 5:95, a weight ratio of the graft copolymer (B) to the rubber-reinforced resin is from 100:0 to 5:95, and the graft copolymer (B) is one prepared by copolymerizing an unsaturated epoxide monomer and at least one monomer selected from the group consisting of aromatic vinyl monomers, cyanated vinyl monomers and alkyl unsaturated carboxylates in the presence of an ethylene-.alpha.-olefin base rubber, which can provide a molded article having improved impact strength, weld strength, stiffness and mold shrinkage factor.
    Type: Grant
    Filed: March 28, 1988
    Date of Patent: August 8, 1989
    Assignee: Sumitomo Naugatuck Co., Ltd.
    Inventors: Mikio Hirai, Tokuo Tatsuda, Tomio Yoshida
  • Patent number: 4841512
    Abstract: An optical disk apparatus is disclosed in which data is recorded, reproduced and erased on an erasable optical disk. After first data is recorded in a predetermined track or sector, it is erased. Second data is then recorded in the same track or sector, and it is decided that the erase function is normal when the second data is reproduced correctly.
    Type: Grant
    Filed: December 17, 1986
    Date of Patent: June 20, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shinji Kubota, Kazutoyo Hirosawa, Tomio Yoshida
  • Patent number: 4762886
    Abstract: A weather resistant thermoplastic resin composition which comprises (A) a graft polymer comprising (A-1) chosen from a copolymer of ethylene and propylene, a terpolymer of ethylene, propylene and a non-conjugated diene, a copolymer of ethylene and vinyl acetate, an alkyl acrylate or methacrylate polymer and a chlorinated polyethylene and (A-2) at least two kinds of monomers chosen from aromatic vinyl compounds, vinyl cyanide compounds and unsaturated carboxylic acid alkyl esters grafted thereon and (B) a terpolymer comprising styrene aromatic compounds, vinyl cyanide compounds and unsaturated carboxylic acid alkyl esters. The weight proportion of the graft polymer (A) and the terpolymer (B) is preferably from 10:90 to 90:10. In particular the amounts of styrene the vinyl cyanide compounds and the unsaturated carboxylic acid alkyl esters in the terpolymer (B) are 3 to 65% by weight, 2 to 35% by weight and 3 to 95% by weight, respectively.
    Type: Grant
    Filed: May 5, 1987
    Date of Patent: August 9, 1988
    Assignee: Sumitomo Naugatick Co., Ltd.
    Inventors: Mikio Hirai, Yoshiaki Nishikubo, Tomio Yoshida, Tsuneo Ochi
  • Patent number: 4759006
    Abstract: A track skipping detection and control arrangement for an optical recording and reproducing disc formed with guide tracks for use in an optical information recording and reproducing apparatus. According to the track skipping detection and control arrangement of the present invention, any sudden track skipping which may take place during recording can be instantaneously detected by the track traversing signal so as to reduce the recording power for the prevention of erroneous recording to neighboring tracks. Moreover, by distinguishing the track traversing signal detected during the jumping operation for repeated continuous reproduction of the particular one track of the optical disc having spiral tracks, from the traversing signal due to the track skipping, erroneous recording may be similarly prevented also with respect to the optical disc having the tracks in the spiral configuration.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: July 19, 1988
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Koishi, Tomio Yoshida, Isao Satoh, Shunji Ohara, Yuzuru Kuroki
  • Patent number: 4757111
    Abstract: A weather-resistant resin having excellent impact resistance, processability and appearance, which comprises a graft polymer comprising an ethylene/alpha-olefin elastomer and at least one monomeric component chosen from aromatic vinyl monomers, vinyl cyanides and alkyl unsaturated carboxylates grafted thereon, the graft polymer having a material soluble in tetrahydrofuran and n-hexane in a volume ratio of 1:4 in a content of not more than 40% by weight and having a material insoluble in tetrahydrofuran in a content of not more than 60% by weight.
    Type: Grant
    Filed: December 26, 1985
    Date of Patent: July 12, 1988
    Assignee: Sumitomo Naugatuck Co., Ltd.
    Inventors: Mikio Hirai, Yoshiaki Nishikubo, Tomio Yoshida, Tsuneo Ochi
  • Patent number: 4724533
    Abstract: An optical head in which the light emitted from a light source is narrowed to a minute spot of light and applied to a recording medium such as a disk thereby to effect recording and reproduction, or reproduction alone. A focusing plate or prism is provided in the optical path for forming the image of the light reflected from the recording medium. The focusing plate or prism has a first surface which reflects and transmits the reflected light and a second surface which is located closer to the image-forming position than the first surface and reflects the reflected light which is transmitted or reflected by the first surface. The optical head is further provided with a photodetector which is divided into at least two portions which individually receive the light rays which are respectively reflected from the first and second surfaces. A focusing servo control signal is obtained from the difference between the respective outputs of the divided photodetector portions.
    Type: Grant
    Filed: June 13, 1985
    Date of Patent: February 9, 1988
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shunji Ohara, Tomio Yoshida, Takashi Ishida
  • Patent number: 4700336
    Abstract: In an optical recording and playback disc apparatus, two light beams (l, m) are focused by a common focusing lens (108) onto an information track (51) of the optical recording disc, and the focused light means (l, m) form two light spots (L, M), the position thereof being controlled by a first tracking servo loop (115, 116 and 117), and furthermore, one (M) of the light spots is independently controlled from the other light spot (L) by a second tracking servo loop (120, 121 and 122).
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: October 13, 1987
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tomio Yoshida, Yoshinobu Nakata, Shunji Ohara, Toshio Satoh
  • Patent number: 4689780
    Abstract: A light beam emitted from a semiconductor laser passes through optical elements which include a condenser lens, a magnifier prism, and a focussing lens to obtain a substantially circular spot of light on a disc. The magnifier prism is constructed such that only the narrower cross-section of the elliptical light beam emitted from the condenser lens is magnified by the incidence surface of the magnifier prism to obtain a substantially circular light beam. The light beam thus obtained is reflected by the prism so that it becomes substantially perpendicular to the beam emitted from the condenser lens. After reflection by the disc, the light passes through a splitter prism. The splitter prism has a reflecting surface and a transmitting surface which spatially bisect the light beam reflected from the disc, a lens and other components. The bisected portions of the beam fall on a photodetector for focussing control and a photodetector for tracking control.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: August 25, 1987
    Assignee: Matsushita Electric Industrial Company, Ltd.
    Inventors: Shunji Ohara, Tomio Yoshida, Isao Satoh, Kenji Koishi
  • Patent number: 4679184
    Abstract: Disclosed is an optical recording and reproducing apparatus having an erasing function. The invention aims at providing a practical apparatus which can effect recording, reproducing and erasing of signals in an erasable recording film by applying laser beams thereto. A substantially circular first fine beam spot is formed by a beam source such as a laser, and an elliptic second beam spot for erasing purposes is formed by another beam source such as a laser, with both beam spots are disposed in close proximity of each other on the same guide track. The erasing beam spot is elongated and has an axis which is tangent to the guide track on the recording medium. The power of intensity profile of the erasing beam spot is so controlled that the highest intensity is obtained at the leading end portion of the erasing beam spot as viewed in the direction of the scan, so that the signal can be erased stably and reliably with minimal erasing power.
    Type: Grant
    Filed: May 31, 1985
    Date of Patent: July 7, 1987
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tomio Yoshida, Shunji Ohara
  • Patent number: 4610732
    Abstract: The invention is to provide zirconium or its alloy used as a material for a chemical device and a nuclear reactor etc. is surface-treated with an oxidizing acid containing an oxidizing metal ion. The oxidizing acid is at least one member or a mixture of two or more selected from the group consisting of, for example, nitric acid (HNO.sub.3), hydrogen peroxide (H.sub.2 O.sub.2), hypochlorous acid (HClO) and potassium permanganate (K.sub.2 MnO.sub.4) solution, among which nitric acid is most preferred. The oxidizing metal ion is at least one member selected from the group consisting of, for example, ruthenium, rhodium, palladium, osmium, iridium, platinum, chromium, vanadium and cerium ions. Particularly preferred treatment conditions comprise a nitric acid concentration of 14 mol/l (65%) which is close to an azeotropic concentration, a ruthenium ion concentration of at least 1.times.10.sup.-3 mol/l and a treatment temperature of a boiling temperature (120.degree. C.).
    Type: Grant
    Filed: March 21, 1985
    Date of Patent: September 9, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Yuko Sasaki, Katsumi Suzuki, Akira Minato, Tomio Yoshida
  • Patent number: 4610910
    Abstract: A printed circuit board comprising an insulating board deposited with a catalyst having reactivity against electroless plating deposition, a resist for electroless plating provided on the insulating board excepting the part where a circuit is to be formed and a circuit formed by electroless plating, wherein the resist for electroless plating contains a coupling agent having a function of preventing the catalyst from ionizing. A process for producing the printed circuit board in which the insulating board surface excepting the part where a circuit is to be formed is covered with a resist for electroless plating containing a coupling agent having a function of preventing the catalyst from ionizing. Use of said resist for electroless plating can prevent drop of insulation resistance of the insulating board after moisture absorption.
    Type: Grant
    Filed: September 28, 1984
    Date of Patent: September 9, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Mineo Kawamoto, Kanji Murakami, Haruo Akahoshi, Yoichi Matsuda, Motoyo Wajima, Makoto Matsunaga, Shoji Kawakubo, Toyofusa Yoshimura, Haruo Suzuki, Tomio Yoshida
  • Patent number: 4566088
    Abstract: An optical and reversible recording and reproducing apparatus providing a practical apparatus in which information signals can be recorded, reproduced and erased by irradiating a laser beam and the like on the substrate to be optically recorded. More practically, there is provided such an apparatus wherein two light sources such as lasers having different wavelengths are used, and a first almost circular micro-lightspot is produced by one light source, while a second elliptic light spot having a longitudinal diameter in the tangential direction of a guide track on a disc is produced by the other light source. These first and second light spots are closely irradiated on one and the same guide track of an optical recording disc. The recording and reproducing of the signals are performed using the first light spot while the erasure of the recorded signals can be made by using the second light spot or using both first and second light spots in combination.
    Type: Grant
    Filed: October 12, 1983
    Date of Patent: January 21, 1986
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tomio Yoshida, Isao Satoh, Shunji Ohara, Kenji Koishi, Yuzuru Kuroki