Patents by Inventor Kenji Kusakabe
Kenji Kusakabe 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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Patent number: 7081863Abstract: A reflector antenna device includes: an auxiliary reflector 1 that receives an electric wave radiated from an opening portion by a primary radiator 3 and reflects the electric wave; and a main reflector 2 that receives the electric wave that is reflected by the auxiliary reflector 1 and radiates the electric wave to a space. In the reflector antenna device, the configurations of the auxiliary reflector 1 and the main reflector 2 are designed such that an electric power in an area of the main reflector 2 where the auxiliary reflector 1 is projected on the main reflector 2 in parallel with the radiating direction of the electric wave due to the main reflector 2 is equal 1 or lower than a predetermined first threshold value, and a radiation pattern of the antenna which is determined by the area of the main reflector 2 other than the area has a desired characteristic.Type: GrantFiled: December 25, 2003Date of Patent: July 25, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshio Inasawa, Shinji Kuroda, Yoshihiko Konishi, Shigeru Makino, Kenji Kusakabe, Izuru Naito
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Patent number: 7009574Abstract: In order to lessen the deterioration of the VSWR, a plural-reflector antenna system is provided wherein an appropriately shaped vertex matching plate is disposed on the subreflector and electric waves that reenter the primary radiator are cancelled out. The electric waves radiated from the primary radiator are reflected by the subreflector and are radiated into space after being reflected by the main reflector. The passing area in the horn aperture, through which the reflected waves from the vertex matching plate pass, is made to be analogous to the aperture of the primary radiator, by defining the vertex matching plate as an ellipsoid, and by orienting its minor-axis direction in the major-axis direction of the main reflector and its major-axis direction, in the minor-axis direction of the main reflector.Type: GrantFiled: August 12, 2004Date of Patent: March 7, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Izuru Naito, Kenji Kusakabe, Toshiyuki Horie, Syuji Nuimura
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Publication number: 20060001588Abstract: A reflector antenna device includes: an auxiliary reflector 1 that receives an electric wave radiated from an opening portion by a primary radiator 3 and reflects the electric wave; and a main reflector 2 that receives the electric wave that is reflected by the auxiliary reflector 1 and radiates the electric wave to a space. In the reflector antenna device, the configurations of the auxiliary reflector 1 and the main reflector 2 are designed such that an electric power in an area of the main reflector 2 where the auxiliary reflector 1 is projected on the main reflector 2 in parallel with the radiating direction of the electric wave due to the main reflector 2 is equal 1 or lower than a predetermined first threshold value, and a radiation pattern of the antenna which is determined by the area of the main reflector 2 other than the area has a desired characteristic.Type: ApplicationFiled: December 25, 2003Publication date: January 5, 2006Inventors: Yoshio Inasawa, Shinji Kuroda, Yoshihiko Konishi, Shigeru Makino, Kenji Kusakabe, Izuru Naito
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Publication number: 20050200547Abstract: In order to lessen the deterioration of the VSWR, a plural-reflector antenna system is provided wherein an appropriately shaped vertex matching plate is disposed on the subreflector and electric waves that reenter the primary radiator are cancelled out. The electric waves radiated from the primary radiator are reflected by the subreflector and are radiated into space after being reflected by the main reflector. The passing area in the horn aperture, through which the reflected waves from the vertex matching plate pass, is made to be analogous to the aperture of the primary radiator, by defining the vertex matching plate as an ellipsoid, and by orienting its minor-axis direction in the major-axis direction of the main reflector and its major-axis direction, in the minor-axis direction of the main reflector.Type: ApplicationFiled: August 12, 2004Publication date: September 15, 2005Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Izuru Naito, Kenji Kusakabe, Toshiyuki Horie, Syuji Nuimura
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Patent number: 5721145Abstract: The present invention is mainly characterized in that a semiconductor substrate improved so as to maintain a gettering effect for a long time can be obtained. A polycrystalline silicon film is formed on the rear surface of a semiconductor substrate. A silicon oxide film and silicon nitride film are formed over the rear surface of semiconductor substrate so as to cover polycrystalline silicon film.Type: GrantFiled: June 24, 1996Date of Patent: February 24, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kenji Kusakabe, Yoshiko Kokawa, Masahiro Sekine
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Patent number: 5539245Abstract: A silicon wafer having a low concentration of carbon and a silicon wafer having a high concentration of carbon are joined and polished to prescribed thicknesses to form a semiconductor substrate according to the present invention.Type: GrantFiled: May 25, 1994Date of Patent: July 23, 1996Assignees: Mitsubishi Materials Silicon Corporation, Mitsubishi Materials Corporation, Mitsubishi Denki Kabushiki KaishaInventors: Makoto Imura, Kenji Kusakabe
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Patent number: 5516706Abstract: Silicon substrate is provided with silicon single-crystalline wafer, natural oxide film and poly-crystalline silicon film. The thickness of natural oxide film is controlled to be less than 10 .ANG.. Since the thickness of natural oxide film is made less than 10 .ANG., heavy metals travel smoothly from silicon single-crystalline wafer to poly-crystalline silicon film in the process of gettering. In other words, it is possible to enhance gettering effect.Type: GrantFiled: October 14, 1994Date of Patent: May 14, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Kenji Kusakabe
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Patent number: 5419786Abstract: A semiconductor substrate allowing reduction of crystal defects in a device formation region of an epitaxial silicon layer and allowing control of the amount of internal precipitation defects of the single crystal silicon substrate, a method of manufacturing such semiconductor substrate, and a semiconductor device utilizing such semiconductor substrate are disclosed. The semiconductor substrate includes a single crystal silicon substrate, an epitaxial silicon layer, and a polycrystalline silicon layer. The interstitial oxygen concentration of the single crystal silicon substrate is set within the range of 12.5-14.0.times.10.sup.17 (atoms/cm3) according to the old ASTM specification. The epitaxial silicon layer is formed on the top surface of the single crystal silicon substrate. The polycrystalline silicon layer is formed at least on the rear surface of the single crystal silicon substrate to a thickness of at least 1 .mu.m.Type: GrantFiled: March 18, 1994Date of Patent: May 30, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshiko Kokawa, Kenji Kusakabe
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Patent number: 5381032Abstract: A semiconductor device without erroneous operation and deterioration of characteristics in a transistor even when an impurity region is formed in self-alignment by ion implantation using a gate electrode as a mask, and a method of manufacturing thereof are disclosed. This semiconductor device includes a gate electrode formed of a polycrystal silicon layer 4b having the crystal orientation of the crystal grains arranged in a definite orientation. By implanting ions at a predetermined angle with respect to the crystallographic axis of the crystal grains of the polycrystal silicon layer 4b in forming a p.sup.+ impurity region 5 by ion implantation using the gate electrode as a mask, the channeling phenomenon where ions pass through the gate electrode is prevented. Therefore, generation of erroneous operation and deterioration of characteristics in a transistor are prevented in forming an impurity region in self-alignment by ion implantation using the gate electrode as a mask.Type: GrantFiled: August 26, 1993Date of Patent: January 10, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yoshiko Kokawa, Tohru Koyama, Kenji Kusakabe, Katsuhiko Tamura, Yasuna Nakamura
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Patent number: 5374842Abstract: Silicon substrate is provided with silicon single-crystalline wafer, natural oxide film and poly-crystalline silicon film. The thickness of natural oxide film is controlled to be less than 10 .ANG.. Since the thickness of natural oxide film is made less than 10 .ANG., heavy metals travel smoothly from silicon single-crystalline wafer to poly-crystalline silicon film in the process of gettering. In other words, it is possible to enhance gettering effect.Type: GrantFiled: February 19, 1993Date of Patent: December 20, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Kenji Kusakabe
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Patent number: 5327007Abstract: A silicon wafer having a low concentration of oxygen and a silicon wafer having a high concentration of oxygen are joined and polished to prescribed thicknesses to form a semiconductor substrate according to the present invention. A region formed of the wafer having a low concentration of oxygen is used as a region where an element is formed, and a region formed of the wafer having a high concentration of oxygen produces a gettering effect on metal impurities and defects. As a DZ layer having a low concentration of oxygen, a wafer manufactured by an MCZ method or a wafer manufactured by a CZ method is used after being heat-treated at high temperature to diffuse oxygen outward. In another example, a damage layer, a polycrystalline silicon layer, an amorphous silicon layer or the like is formed between a DZ layer and an IG layer.Type: GrantFiled: September 30, 1992Date of Patent: July 5, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Makoto Imura, Kenji Kusakabe
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Patent number: 5221630Abstract: A semiconductor device not aggravated in transistor characteristic even when an impurity region is formed by ion implantation using a gate electrode as a mask, and a method of manufacturing thereof are disclosed. The semiconductor device includes a gate electrode 10 implemented by a polycrystal silicon layer 4 having the crystal orientation of the crystal grains thereof arranged in a predetermined orientation, and a single crystal silicon layer 5 formed on the polycrystal silicon layer 4 having a crystal orientation identical to that of the polycrystal silicon layer 4. The channelling phenomenon in which B.sup.+ ions pass through to beneath the gate electrode 10 is prevented in forming an impurity region 6 by ion implantation to obtain a semiconductor device that does not have the characteristic of the formed transistor aggravated.Type: GrantFiled: October 16, 1992Date of Patent: June 22, 1993Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tohru Koyama, Katsuhiko Tamura, Yasuna Nakamura, Yoshiko Kokawa, Kenji Kusakabe
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Patent number: 5177569Abstract: A semiconductor device not aggravated in transistor characteristic even when an impurity region is formed by ion implantation using a gate electrode as a mask, and a method of manufacturing thereof are disclosed. The semiconductor device includes a gate electrode 10 implemented by a polycrystal silicon layer 4 having the crystal orientation of the crystal grains thereof arranged in a predetermined orientation, and a single crystal silicon layer 5 formed on the polycrystal silicon layer 4 having a crystal orientation identical to that of the polycrystal silicon layer 4. The channelling phenomenon in which B.sup.+ ions pass through to beneath the gate electrode 10 is prevented in forming an impurity region 6 by ion implantation to obtain a semiconductor device that does not have the characteristic of the formed transistor aggravated.Type: GrantFiled: November 8, 1991Date of Patent: January 5, 1993Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tohru Koyama, Katsuhiko Tamura, Yasuna Nakamura, Yoshiko Kokawa, Kenji Kusakabe
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Patent number: 4964969Abstract: A semiconductor production apparatus employs a target prepared by using a solder alloy which has a limited Sn content. The solder alloy can form an alloy layer having large elongation between a metal target and a backing plate to prevent undesirable cracking and separation of target, whereby a semiconductor device can be produced with a high degree of reliability.Type: GrantFiled: September 11, 1989Date of Patent: October 23, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kenji Kusakabe, Keiji Yamauchi
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Patent number: 4876224Abstract: A silicon wafer for a semiconductor substrate comprises a flat wafer body, with a polycrystalline silicon layer formed only on the rear surface of said wafer body.The silicon wafer is manufactured by the steps of forming a polycrystalline silicon layer on the entire surface of the silicon wafer body, etching and removing the portion of the polycrystalline silicon layer which is formed on the side surface of silicon wafer body, and polishing and removing the polycrystalline silicon layer on the front surface of the silicon wafer body.Type: GrantFiled: June 30, 1988Date of Patent: October 24, 1989Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Kenji Kusakabe
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Patent number: 4616289Abstract: This invention relates to ceramic high dielectric composition with BaTiO.sub.3 as host component; and by containing 1-5 weight part of CaTiO.sub.3 and 2-3 weight parts of Ta.sub.2 O.sub.5 to 100 weight parts of the BaTiO.sub.3, a composition having dielectric constant of 3000 or above, a small voltage dependency, a large bending strength and good high frequency characteristic is provided; and it has a good characteristic when used as thin film type dielectric body like laminated ceramic capacitor.Type: GrantFiled: June 19, 1985Date of Patent: October 7, 1986Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Gen Itakura, Tadayoshi Ushijima, Kenji Kusakabe, Takayuki Kuroda