Patents by Inventor Ritsuo Inaba
Ritsuo Inaba 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: 6368730Abstract: An electroluminescent device includes a transparent substrate, a transparent anode, a thin film electrode and a light emitting organic polymer layer. Both of the surface of the transparent substrate and the surface of the transparent anode are imparted hydrophobicity so that an excellent electroluminescent device which hardly causes change in luminance with a lapse of time and has few dark spots can be obtained. Also a new polymer film is used as the transparent substrate so that a thin and flexible electroluminescent device, which hardly causes change in luminance with a lapse of time and has few dark spots, can be obtained. Also a new construction color electroluminescent display panel is described, which can be made flexible and reduced in thickness, long life, superior in resolution and easily produced.Type: GrantFiled: October 9, 1998Date of Patent: April 9, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoshio Kishimoto, Ritsuo Inaba
-
Patent number: 5885498Abstract: The present invention is to provide a organic light emitting device with high efficiency and long life of emitting light. The light emitting device comprises a positive electrode, a hole transporting layer, an electron transporting layer and a negative electrode on a substrate, the hole transporting layer if formed of triphenylamine tetramer as the major component, and 5,6,11,12-tetraphenylnaphthacene or 9,10-diphenylanthracene is added in a amount of 0.1-10% in the hole transporting layer. The hole transporting layer acts as a light emitting layer and suppressing reduction of luminance of the light and prevent the black spots from occurring and expanding so as to extend the life time. Furthermore, in the present invention, the transparent positive electrode is composed from two-layer structure comprising a hole injecting layer and a current distributing layer, this restricting occurrence of the black spots and reduction of the luminance due to the positive electrode.Type: GrantFiled: December 10, 1997Date of Patent: March 23, 1999Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Mikiko Matsuo, Ritsuo Inaba
-
Patent number: 4888514Abstract: In a driving apparatus for ultrasonic motor, a variable oscillator (44) varies oscillating frequency responding to current level of detected current which flows to a piezoelectric member (1, 2) and is in proportion to mechanical vibration of the piezoelectric member (1, 2) when mechanical resonance frequency varies by change of environmental condition.Type: GrantFiled: October 13, 1988Date of Patent: December 19, 1989Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Ken-ichiroh Takahashi, Ritsuo Inaba, Nobukazu Sugano, Horiyuki Harao, Yukihiro Matsuyama, Hiromi Tanoue, Toru Kishi
-
Patent number: 4853579Abstract: A method of driving an ultrasonic motor having a rotation body (6) which is rotated by travelling waves generated in a vibrator body (3), whereby the drive frequency of the motor is controlled in accordance with the value of an operating parameter such as phase difference between drive current and voltage, such as to maintain the drive frequency at a value which is lower than the antiresonance frequency of the vibrator body (3) and higher than a highest resonance frequency of the vibrator body (3) in a hysteresis loop exhibited by a resonance frequency characteristic of the vibrator body (3). Continuous stable operation is attained, irrespective of the effects of temperature and load changes upon the motor operating characteristics.Type: GrantFiled: August 25, 1987Date of Patent: August 1, 1989Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Osamu Kawasaki, Katsu Takeda, Ritsuo Inaba, Tetsuji Fukada
-
Patent number: 4829209Abstract: In an ultrasonic motor wherein an elastic travelling wave is excited in a vibrating stator comprising a piezoelectric element and an elastic element thereby to drive and a rotor which is disposed to touch the vibrating stator with pressure by friction forces, an ultrasonic motor having high efficiency is obtained. In the present invention, the above-mentioned vibrating stator is substantially disk-type, electrodes being provided to the piezoelectric element are disposed in a form of two sets of concentric circles having different phases with respect to each other in a circumferential direction in which the vibration is travelling, and have a constitution which excites the vibrating stator by flexural vibration modes of second order or higher in a radial direction and of third order or higher in the circumferential direction, and also, are designed so that at least mechanical impedances seen from each electrode become equal.Type: GrantFiled: November 20, 1987Date of Patent: May 9, 1989Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Osamu Kawasaki, Ritsuo Inaba, Akira Tokushima, Katsu Takeda
-
Patent number: 4602159Abstract: In an infrared detector, a shutter is employed in an elastic wave element of a feedback type of oscillator containing the elastic element so that the elastic element receives infrared light intermittently. The period during which the number of peaks of the oscillation output waveform from the oscillator exceeds a predetermined value is set to be the opening or closing period of the shutter, the number of clock pulses from a clock signal generator is counted during the shutter opening or closing period, and the difference between the counted values is obtained, thereby detecting the energy of the infrared light. This detector features not only an extremely high sensitivity, but a high detection accuracy, as well as the production of a digital output.Type: GrantFiled: April 9, 1984Date of Patent: July 22, 1986Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yukio Kasahara, Ritsuo Inaba
-
Patent number: 4562373Abstract: A piezoelectric motor wherein a stator comprising piezoelectric vibrators of rectangular or circular plate form pasted with a metal is used as a power source and a mechanical vibration in two directions, longitudinal and widthwise directions or radial and tangential directions, is converted into a rotary or linear motion through frictional force.Type: GrantFiled: October 22, 1984Date of Patent: December 31, 1985Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Akira Tokusima, Ritsuo Inaba
-
Patent number: 4553099Abstract: An electrostatic voltage sensor which includes a surface acoustic wave propagating medium and transmitting and receiving transducers coupled to the medium. The voltage sensor is provided with a separate voltage collecting member different from the electrode for applying a voltage or electric field, and the voltage obtained in the voltage collecting member is varied by a predetermined frequency for being applied to the electrode so as to detect external voltage by the variation component of the oscillating frequency.Type: GrantFiled: March 8, 1982Date of Patent: November 12, 1985Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yukio Kasahara, Ritsuo Inaba, Kiyotaka Wasa
-
Patent number: 4510443Abstract: A voltage measuring device includes a surface acoustic wave propagating medium and transmitting and receiving transducers coupled to the medium. An electrode that receives an unknown voltage is applied to the medium for effecting, when the unknown voltage is supplied, a frequency change in the acoustic wave propagating through the medium. A detector is provided for detecting the frequency change which is an indication of voltage supplied to the electrode.Type: GrantFiled: May 11, 1983Date of Patent: April 9, 1985Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Ritsuo Inaba, Kiyotaka Wasa
-
Patent number: 4501987Abstract: A surface acoustic wave transducer has a multilayered substrate which is made of a nonpiezoelectric plate which has a surface which is coated with a piezoelectric film, and has an interdigital electrode which is disposed on or under the surface of the piezoelectric film. The interdigital electrode has a split structure and the phase velocity of the surface acoustic wave of the piezoelectric film is smaller than that of the nonpiezoelectric plate.Type: GrantFiled: December 3, 1981Date of Patent: February 26, 1985Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tsuneo Mitsuyu, Shusuke Ono, Ritsuo Inaba, Kiyotaka Wasa
-
Patent number: 4342012Abstract: A surface acoustic wave device in which an X-cut LiTaO.sub.3 single crystal substrate has its one major surface coated with a SiO.sub.2 film and the direction of propagation of surface acoustic waves is selected between 80.degree. and 180.degree. measured from the Y-axis toward the Z-axis. The surface acoustic wave devices in accordance with the present invention has an extremely low temperature coefficient change and a high electro-mechanical coupling coefficient, exhibits a higher degree of both short- and long-term stability, and can suppress the generation of unwanted waves to a minimum or negligible degree.Type: GrantFiled: February 18, 1981Date of Patent: July 27, 1982Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Ritsuo Inaba, Kiyotaka Wasa