Patents by Inventor Haruhiko Nagai
Haruhiko Nagai 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).
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Publication number: 20020135553Abstract: It is aimed to perform a gradation display by using a light source array. A pixel having a desired luminance Y can be displayed by changing an emission intensity P of LED light source during one pixel display period C and turning on and off LCD corresponding to the change of the emission intensity P of LED light source.Type: ApplicationFiled: April 25, 2002Publication date: September 26, 2002Inventors: Haruhiko Nagai, Sadaomi Kamizawa, Ko Nishino, Takahiro Urakabe, Akihiko Iwata
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Patent number: 6337724Abstract: A plurality of liquid crystal modules is vertically and horizontally arranged, each of which is supplied light by a light source via optical fibers. A screen can be wound up at a cabinet. An image from each of the plurality of liquid crystal modules does not interfere one another because a light shielding board is installed.Type: GrantFiled: December 5, 1996Date of Patent: January 8, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshio Itoh, Haruhiko Nagai, Tsunehiro Imamura, Takayoshi Semasa, Kenji Tatsumi, Shuji Iwata, Hiroshi Mitsuda, Yasuhito Myoi, Toshimasa Tomoda, Fumio Suzuki, Yoshisuke Ohtsuru
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Patent number: 5864374Abstract: A dichroic mirror for reflecting red light for optical separating and a dichroic mirror for reflecting red light for optical synthesizing are installed on the same plane in an image generating apparatus of the present invention. In addition, a dichroic mirror for reflecting blue light for optical separating and a dichroic mirror for reflecting blue light for optical synthesizing are installed on the same plane. Accordingly, a compact configuration can be realized. Since a main reflecting mirror is a rotating elliptic mirror and a lamp is located on a focus or around the focus, a lighting equipment which irradiates conic luminous flux can be realized.Type: GrantFiled: March 29, 1996Date of Patent: January 26, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshio Ito, Yoshisuke Ohtsuru, Hisao Koizumi, Takio Okuda, Yasuhito Myoi, Toshimasa Tomoda, Masaaki Tanaka, Teruo Miyamoto, Toyomi Ohshige, Toshiyuki Yoneda, Fumio Suzuki, Kou Nishino, Kazuaki Matoba, Masanori Kojima, Hiroshi Kawamura, Kenji Kimura, Kenji Samejima, Naoki Kawamoto, Miki Fukada, Haruhiko Nagai, Kenji Maeno
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Patent number: 5313487Abstract: At least two types of preionization systems are provided at a backside of one of a pair of primary electrodes which are disposed in a spaced opposed relation with respect to each other for causing a large area, spatially uniform main discharge in a laser gas therebetween. This improves efficiency and stability in laser oscillations under repeated operations at a high rate of tens to hundreds of shots per second. In addition, without using the laser output power, the preionization timing is controlled such that an optimal preionization timing is realized. The optimal preionization timing is determined on the basis of a minimum discharge starting voltage between the primary electrodes or a minimum required time from the time of applying a high voltage between said first and second primary electrodes until the time the main discharge commences.Type: GrantFiled: May 22, 1992Date of Patent: May 17, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shuichi Fujikawa, Mitsuo Inoue, Yukio Sato, Haruhiko Nagai
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Patent number: 5305338Abstract: A switch device used for a laser device, includes series-parallel connected switch elements or modules. The switch elements or modules are simultaneously turned on by trigger signals from trigger circuits. The transmission lines for connecting the trigger circuits to respective switch elements are equal to one another in length. A protecting circuit is provided for the switch elements, and indicators are provided for indicating the shortcircuit of the switch elements. In the switch device, the number of wires for the switch elements is made small and heat generated from the switch elements is effectively radiated. The modules are easily stacked, and firmly connected to a control unit for controlling the switch elements. A discharge excited laser device using the switch device has a high efficiency and a long lifetime and is reliable.Type: GrantFiled: September 10, 1991Date of Patent: April 19, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hitoshi Wakata, Akihiro Suzuki, Kenyu Haruta, Haruhiko Nagai, Akihiko Iwata, Shinji Murata, Isamu Tanakura, Tomohiro Sasagawa, Yuito Kimura
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Patent number: 5187716Abstract: At least the opposing surface portions of the main electrodes of an excimer laser device are covered with materials which are resistive to chemical etching than nickel. The etching resistive material may be a platinum based alloy containing rhodium, ruthenium, iridium, or osmium; a nickel based alloy containing gold, platinum, rhodium, ruthenium, iridium, or osmium; or rhodium, ruthenium, iridium, or osmium. Thus, an excimer laser device is realized by which the lives of the electrodes and the laser gas are prolonged.Type: GrantFiled: July 3, 1991Date of Patent: February 16, 1993Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kenyu Haruta, Haruhiko Nagai, Hajime Nakatani, Yoshihiko Yamamoto, Taketoshi Takemura, Takashi Eura, Shungo Tsuboi, Yoshifumi Matsushita, Tadao Minagawa
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Patent number: 5181217Abstract: A discharge pumping circuit of spiker/sustainer type for the Excimer laser oscillator, wherein spiker unit is isolated from the sustainer unit by a switching device such as a magnetic isolator is disclosed. In the pumping circuit, the switching device shifts from its OFF state to its ON state, during the process of charging a spiker capacitor, before its terminal voltage reaches a voltage which initiates the discharge, and a sharp-rise pulse voltage is applied by a transfer of electric charge from said sustainer capacitor to said spiker capacitor, to initiate the discharge for the pumping. In another discharge-pumping circuit which also has a means for preionizing the laser gas, the timing for the preionization is set to start after the initiation of charging the sustainer capacitor and before the initiation of charging the spiker capacitor in a polarity opposite to that of the sustainer capacitor, and is controlled for maintaining the discharge initiating voltage constant for the repetition frequency.Type: GrantFiled: July 9, 1991Date of Patent: January 19, 1993Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yukio Sato, Akihiro Suzuki, Mitsuo Inoue, Kenyu Haruta, Haruhiko Nagai
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Patent number: 5107511Abstract: A method and apparatus for stabilizing the wavelength in a laser. The apparatus includes a first and second etalon for fine and rough tuning, respectively, of a laser oscillator. The output power and wavelength of the laser beam, for example, can be used to adjust these etalons to provide a constant output power and to counteract the change in etalon characteristics due to heat.Type: GrantFiled: August 25, 1989Date of Patent: April 21, 1992Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hajime Nakatani, Yoshibumi Minowa, Hiromi Kaneko, Hitoshi Wakata, Kenyu Haruta, Haruhiko Nagai, Kenichi Yasuda, Hiroyuki Mukumoto
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Patent number: 4914662Abstract: A laser wavelength is stabilized by deriving a portion of laser beam emitted from a wavelength variable laser oscillator, spectroscopically processing the laser beam portion by means of a wavelength monitor mechanism, measuring a spatial intensity distribution of the spectroscopically processed beam portion, spectroscopically processing light having a specific wavelength and measuring a spatial intensity distribution thereof, analyzing the measured spatial intensity distribution of the spectroscopically processed beam portion on the basis of the measured spatial intensity distribution of the spectroscopically processed light having the specific wavelength, and controlling wavelength of the laser oscillator according to a result of the analysis.Type: GrantFiled: September 26, 1988Date of Patent: April 3, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hajime Nakatani, Yoshibumi Minowa, Hitoshi Wakata, Haruhiko Nagai, Kenyu Haruta
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Patent number: 4837773Abstract: A discharge excitation type short pulse laser device is provided with a preliminary ionization circuit, the effeciency of preliminary ionization of which is remarkably improved. The laser device comprises a main discharge circuit including first and second main electrodes which are confronted with each other in a laser medium, main discharge capacitor means for storing energy for main discharge, and a discharge starting high voltage switch; and a preliminary ionization circuit connected to said high voltage switch, said preliminary ionization circuit including a discharging gap for preliminary ionization, a preliminary ionization capacitor and an inductance.Type: GrantFiled: October 31, 1988Date of Patent: June 6, 1989Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hitoshi Wakata, Mitsuo Inoue, Yukio Sato, Kenyu Haruta, Haruhiko Nagai
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Patent number: 4722090Abstract: The present invention relates to excimer laser equipment which is one kind of gas laser, and in particular to a rare gas-halide excimer laser using rare gases and halogens as laser media, and adapted to control the concentration of halogens contained in laser media therewithin on the basis of the result of the measurement of the concentration of halogens in the laser media which is being used for the oscillation of laser rays therein, whereby the stabilized oscillation of the laser is always possible.Type: GrantFiled: March 12, 1986Date of Patent: January 26, 1988Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kenyu Haruta, Hitoshi Wakata, Yukio Sato, Haruhiko Nagai
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Patent number: 4686682Abstract: A discharge excitation type short pulse laser device which is constructed with first and second main electrodes disposed in confrontation with the direction of the laser beam axis as their longitudinal direction, an auxiliary electrode provided on the rear surface part of the second main electrode and opposed to the second main electrode through the dielectric member, a pulse circuit for applying a pulse voltage across the first and second main electrodes, and a circuit for applying a voltage across the auxiliary electrode and the second main electrode, the circuit forming a part of the pulse circuit, or being independent of the pulse circuit, wherein the second main electrode is made of an electrically conductive material having a plurality of apertures therein, the second main electrode and the dielectric member are disposed in tight adhesion each other, and the second main electrode is thinly formed to enable creeping discharge to be produced on the surface of the dielectric member, thereby distributing elType: GrantFiled: October 1, 1985Date of Patent: August 11, 1987Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kenyu Haruta, Hitoshi Wakata, Yukio Sato, Haruhiko Nagai, Hajime Nakatani, Hideki Kita
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Patent number: 4606035Abstract: A lateral excitation type gas laser device having a small size and high output. An anode and a cathode are arranged opposite one another with a flow of laser gas therebetween. A high DC voltage is applied between the anode and cathode to cause a glow discharge therebetween. A dielectric electrode is disposed in the flow of laser gas upstream of the anode and cathode, and a high frequency high voltage is applied between the dielectric electrode on one hand and the anode and cathode on the other for causing a silent discharge therebetween. The dielectric electrode has a diameter of 3 mm<D<d/2, where D is the diameter of the dielectric electrode and d is the length of the gap between the anode and cathode. The dielectric electrode is disposed in a region defined by 0.ltorsim.l.sub.1 .ltorsim.2d and 0.ltorsim.l.sub.2 .ltorsim.d, where l.sub.1 is the distance in the direction of the laser gas flow between the dielectric electrode and the cathode and l.sub.Type: GrantFiled: March 22, 1984Date of Patent: August 12, 1986Assignee: Agency of Industrial Science and TechnologyInventors: Masao Hishii, Masaaki Tanaka, Yukio Sato, Haruhiko Nagai, Norikazu Tabata
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Patent number: 4488309Abstract: A gas laser apparatus having an anode and a cathode for imparting a glow discharge to a stream of laser gas in response to a high d.c. voltage, also includes a dielectric electrode positioned within said stream of laser gas between the anode and cathode for exciting a pulsed silent discharge of the laser gas in response to an a.c. high voltage power source that supplies a pulsed high a.c. voltage to said dielectric electrode. A pulsed large-current glow discharge is produced between the anode and cathode to thereby emit a large, pulsed laser output. The apparatus may also include controls for controlling the power of the silent discharge excited by the dielectric electrode to thereby control the laser output.Type: GrantFiled: September 13, 1982Date of Patent: December 11, 1984Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masaaki Tanaka, Yukio Sato, Masao Hishii, Haruhiko Nagai
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Patent number: 4343040Abstract: A high pressure transverse excitation type laser oscillator comprises a plane anode and a plurality of rod type cathodes to form glow discharge. Each cathode is covered with a cylindrical insulator having heat resistance except for a small discharge surface whereby the shift of the glow discharge caused by varying the pressure or the discharge current can be prevented to thus obtain stable glow discharge.Type: GrantFiled: June 26, 1981Date of Patent: August 3, 1982Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kouzaburo Shibayama, Toshimitsu Akiba, Haruhiko Nagai, Masao Hishii
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Patent number: 4317090Abstract: An electrical discharge occurs between the anode and the cathode and the active gas such as CO.sub.2 between the two electrodes is excited to provide a laser beam. The laser beam thus provided is reflected repeatedly by a pair of reflection mirrors. The reflected laser beam is amplified while passing through the space where the discharge occurs, thus providing the function of a gas laser oscillator. Although the amplification that occurs in the discharge zone between the electrodes, considerable laser beam absorption takes place in the space between the reflection mirrors and the electrodes. In this space, the amount of operating gas such as CO.sub.2 is reduced, or the space is evacuated. Alternatively, the space is cooled by causing the gas therein to flow. A reduction in so-called laser beam absorption function is provided.Type: GrantFiled: July 20, 1979Date of Patent: February 23, 1982Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Akio Nagai, Haruhiko Nagai, Masao Hishii