Patents by Inventor Tadashi Ota

Tadashi Ota 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: 5485294
    Abstract: An active element such as a MIM element includes a first electrically conductive layer, a nonlinearly conductive layer having a low dielectric constant disposed on the first conductive layer and a second electrically conductive layer disposed on the nonlinearly conductive layer. The nonlinearly conductive layer can be deposited on the first conductive layer by electrolytic polymerization. A matrix of liquid crystal picture element electrodes driven by active elements in accordance with the invention can be formed with as little as two or three photolythographic steps.
    Type: Grant
    Filed: October 3, 1991
    Date of Patent: January 16, 1996
    Assignee: Seiko Epson Corporation
    Inventors: Jun Sugiyama, Tadashi Ota
  • Patent number: 5032918
    Abstract: An electronic still camera designed to record on a memory card an audio signal in addition to an image signal includes an imaging device for receiving light from an object and outputting an analog image signal, a first A/D conversion means for converting the analog image signal obtained by the imaging device into a digital image signal, a microphone for picking up sound and outputting an analog audio signal, a second A/D conversion means for converting the analog audio signal obtained by the microphone into a digital audio signal, a control means for recording the digital image signal and the digital audio signal onto a memory card which is removably mounted on a camera body, and a semiconductor line memory for storing the digital audio signal.
    Type: Grant
    Filed: October 2, 1990
    Date of Patent: July 16, 1991
    Assignee: Nikon Corporation
    Inventors: Tadashi Ota, Takao Ikuma
  • Patent number: 4758883
    Abstract: A completely electronic color camera for electronically recording an image of an object. The image signals from a solid-state image sensor having color filters are converted to digital form so that the digitized image signals are applied to the same number of coding compression circuits, e.g. differential pulse code modulation circuits, as the kinds of colors of the color filters per scanning line, are subjected to a color separation coding processing and are then stored directly in a memory without performing any additional processing. Error detecting and correctng circuits are provided. Error detecting and correcting data and lens setting data are added to the image data and recorded. The camera is reduced in size, is low in power consumption and requires a reduced memory capacity per frame.
    Type: Grant
    Filed: October 12, 1983
    Date of Patent: July 19, 1988
    Assignee: Nippon Kogaku K.K.
    Inventors: Atsushi Kawahara, Toshihisa Kuroiwa, Tadashi Ota
  • Patent number: 4710825
    Abstract: A system for recording information on an information recording disc such as a magnetic or optical disc. The recording system includes velocity control means for controlling the disc at a predetermined rotation velocity and synchronizing signal phase shifting means for shifting the phase of a synchronizing signal of a signal to be recorded. The system controls the rotation of the disc by the velocity control at the same velocity as the rotation velocity in the phase locked condition by the phase control in a very short period of time and during the recording of a signal the synchronizing signal of the signal is generated to conform with the rotational phase of the disc thereby producing the same condition as the phase locked condition.
    Type: Grant
    Filed: December 8, 1986
    Date of Patent: December 1, 1987
    Assignee: Nippon Kogaku K.K.
    Inventors: Masaya Okita, Masahiro Sawada, Tadashi Ota
  • Patent number: 4710684
    Abstract: A drive circuit for a brushless DC motor capable of generating a torque in the acceleration and deceleration directions, respectively, and effective when used in a portable device such as an electronic still picture camera. In the drive circuit, a power amplifier having an output stage composed of a pair of complementarily connected tansistors is connected to each end of each of the stator coils. Thus, the drive circuit controls the input potentials of the power amplifiers so as to produce a potential difference across the terminals of each of the stator coils and thereby control the magnitude and direction of current flow through the stator coils. Also, all the transistors of the power amplifier output stages are cut off to prevent the flow of current through the stator coils.
    Type: Grant
    Filed: October 12, 1984
    Date of Patent: December 1, 1987
    Assignee: Nippon Kogaku K.K.
    Inventors: Masaya Okita, Masahiro Sawada, Tadashi Ota
  • Patent number: 4658191
    Abstract: A control apparatus whereby each time a motor adapted to start and stop its rotation repeatedly a plurality of times is rotated, the phase reference of a rotating object is adjusted and the rotating object is locked to a normal speed in a short period of time from the start. The control apparatus includes circuitry for detecting that the difference between the phase of a detection clock signal and the phase of rotation of the motor is less than predetermined value and the control of the motor is switched between the speed control and the phase control in accordance with the phase difference.
    Type: Grant
    Filed: March 25, 1986
    Date of Patent: April 14, 1987
    Assignee: Nippon Kogaku K.K.
    Inventors: Masaya Okita, Masahiro Sawada, Tadashi Ota
  • Patent number: 4614977
    Abstract: A still picture signal conversion apparatus converts a still picture signal reproduced in the form of an electric signal from a video tape or disk, still picture video camera or the like to a low-velocity narrow-band signal suited for use in a facsimile system utilizing the ordinary telephone circuit or a hard copying apparatus and performs the desired trimming operation on the signal when delivering the same. A selected portion of each horizontal scan line is taken out as a sampled digital picture signal and the number of the horizontal picture elements is compensated for by the method of sampling frequency adjustment or weighted interpolation. To effect the vertical trimming, the digital picture signal is stored temporarily every horizontal scan line in a plurality of memories so that portion of the signal to be retained by the trimming is selectively read out and the deficient number of scan lines is compensated for by the method of weighted interpolation.
    Type: Grant
    Filed: December 20, 1982
    Date of Patent: September 30, 1986
    Assignee: Nippon Kogaku K.K.
    Inventors: Atsushi Kawahara, Tadashi Ota, Toshihisa Kuroiwa, Masaki Isogai, Norihiko Takatsu, Koichiro Kawamura
  • Patent number: 4560982
    Abstract: A liquid crystal display device having non-linear characteristics provides uniform quality in a matrix display. In driving rows and columns of picture elements the duty ratio is substantially increased by shortening the time in which the picture element is selected and charged for lighting. Charging time is less than the half frame period divided by the number of columns to be driven in the half frame, and more rows of elements can be driven in the half frame period. The portion of time actually used for charging is designated as a fine scanning period. By modulating the voltage levels across the liquid crystal layer during fine scanning periods when the crystal element is not selected, effective voltage across the picture elements is maintained with little variation regardless of the number of picture elements driven on the same signal line. A gray scale display can be provided.
    Type: Grant
    Filed: July 30, 1982
    Date of Patent: December 24, 1985
    Assignee: Kabushiki Kaisha Suwa Seikosha
    Inventors: Tomio Sonehara, Masami Murata, Tadashi Ota
  • Patent number: 4525033
    Abstract: Liquid crystal compounds which are para-substituted phenyl esters of para-substituted cyclohexyl carboxylic acid, are effective in compositions for use in liquid crystal display devices, particularly for operation in the multiplexing mode. The cyanophenyl esters may be used in a wide variety of compositions. The compounds are stable, inert to moisture, light and oxygen and have low viscosity. Moreover, they can be used in compositions using the guest-host effect.
    Type: Grant
    Filed: December 7, 1981
    Date of Patent: June 25, 1985
    Assignee: Kabushiki Kaisha Suwa Seikosha
    Inventor: Tadashi Ota
  • Patent number: 4523811
    Abstract: An active matrix liquid crystal display device wherein individual display elements are controlled by non-linear devices and methods of fabricating the display devices are provided. The non-linear devices are metal-insulator-metal structures (MIM). Two MIM elements are coupled in parallel to each other and connected to each display element in series. The MIM element includes a metallic thin film of Ta or nitrogen doped Ta and an oxide film formed by anodizing the metallic thin film and a second metallic thin film. The liquid crystal display matrix is formed by depositing a lower metallic thin film on a transparent substrate, selectively removing the first film, anodizing the surface of the first metallic thin film, depositing a pattern of an upper metallic thin film and selectively removing both the lower metallic thin film and the anodized oxide film at the regions other than where the MIM elements are being formed.
    Type: Grant
    Filed: January 15, 1982
    Date of Patent: June 18, 1985
    Assignee: Kabushiki Kaisha Suwa Seikosha
    Inventor: Tadashi Ota