Patents by Inventor Kouji Tomita
Kouji Tomita 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: 9845999Abstract: A liquid-cooled-type cooling device includes a casing having a top wall, a bottom wall, and a cooling-liquid passage, and a radiating member disposed in the cooling-liquid passage. The radiating member has a substrate and a plurality of pin-shaped fins. Longitudinally intermediate portions of the pin-shaped fins are brazed to the substrate. The substrate has a plurality of fin insertion holes, and the pin-shaped fins are inserted into the fin insertion holes of the substrate. A plurality of convex portions are integrally formed on the longitudinally intermediate portion of each pin-shaped fin. The substrate and the pin-shaped fins are provisionally fixed together by plastically deforming the convex portions such that they are crushed. In this state, the substrate and the pin-shaped fins are brazed together. The upper and lower end portions of the pin-shaped fins are brazed to the top wall and bottom wall, respectively, of the casing.Type: GrantFiled: November 7, 2012Date of Patent: December 19, 2017Assignee: SHOWA DENKO K.K.Inventors: Seiji Matsushima, Kouji Tomita
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Publication number: 20130284404Abstract: A liquid-cooled-type cooling device includes a casing having a top wall, a bottom wall, and a cooling-liquid passage, and a radiating member disposed in the cooling-liquid passage. The radiating member has a substrate and a plurality of pin-shaped fins. Longitudinally intermediate portions of the pin-shaped fins are brazed to the substrate. The substrate has a plurality of fin insertion holes, and the pin-shaped fins are inserted into the fin insertion holes of the substrate. A plurality of convex portions are integrally formed on the longitudinally intermediate portion of each pin-shaped fin. The substrate and the pin-shaped fins are provisionally fixed together by plastically deforming the convex portions such that they are crushed. In this state, the substrate and the pin-shaped fins are brazed together. The upper and lower end portions of the pin-shaped fins are brazed to the top wall and bottom wall, respectively, of the casing.Type: ApplicationFiled: November 7, 2012Publication date: October 31, 2013Inventors: Seiji Matsushima, Kouji Tomita
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Patent number: 7247515Abstract: A frame for a semiconductor package has die-pads supported with suspending leads of individual lead frames. Semiconductor devices are arranged on the die-pads. These semiconductor devices are collectively molded with molding compound, and then the collectively molded semiconductor packages are cut into individual packages by means of a dicing saw. In the frame, suspending leads are formed into fish tails, wherein at least one of a longitudinal grid-lead and a transverse grid-lead is eliminated within areas enclosed with fish tails of the suspending leads. Accordingly, whether an R-shape generated by producing the frame by etching is large or small, the existence of metal pieces at the edges of the semiconductor packages is substantially prevented.Type: GrantFiled: December 21, 2004Date of Patent: July 24, 2007Assignee: Dainippon Printing Co., Ltd.Inventors: Chikao Ikenaga, Kouji Tomita
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Patent number: 6897549Abstract: A frame for a semiconductor package has die-pads supported with suspending leads of individual lead frames. Semiconductor devices are arranged on the die-pads. These semiconductor devices are collectively molded with molding compound, and then the collectively molded semiconductor packages are cut into individual packages by means of a dicing saw. In the frame, suspending leads are formed into fish tails, wherein at least one of a longitudinal grid-lead and a transverse grid-lead is eliminated within areas enclosed with fish tails of the suspending leads. Accordingly, whether an R-shape generated by producing the frame by etching is large or small, the existence of metal pieces at the edges of the semiconductor packages is substantially prevented.Type: GrantFiled: January 13, 2003Date of Patent: May 24, 2005Assignee: Dainippon Printing Co., Ltd.Inventors: Chikao Ikenaga, Kouji Tomita
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Publication number: 20050106777Abstract: A frame for a semiconductor package has die-pads supported with suspending leads of individual lead frames. Semiconductor devices are arranged on the die-pads. These semiconductor devices are collectively molded with molding compound, and then the collectively molded semiconductor packages are cut into individual packages by means of a dicing saw. In the frame, suspending leads are formed into fish tails, wherein at least one of a longitudinal grid-lead and a transverse grid-lead is eliminated within areas enclosed with fish tails of the suspending leads. Accordingly, whether an R-shape generated by producing the frame by etching is large or small, the existence of metal pieces at the edges of the semiconductor packages is substantially prevented.Type: ApplicationFiled: December 21, 2004Publication date: May 19, 2005Inventors: Chikao Ikenaga, Kouji Tomita
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Patent number: 6882048Abstract: A lead frame used for the production of a semiconductor package, wherein each of terminals of the lead frame to be wire-bonded to electrodes provided on the top surface of the semiconductor device has one or two groove(s) for limiting a plating area of noble metal. Since grooves are provided in each terminal, the accuracy of the plating area can be easily checked visually. Further, the grooves absorb stress applied to the terminal when the molded semiconductor packages are individually separated from each other by punching or dicing, and the situation where molding compound comes off of the terminal is prevented. In addition, since the grooves absorb vibrational stress applied to the terminal after mounting a semiconductor on the printed circuit board, the reliability of assembly is improved.Type: GrantFiled: March 21, 2002Date of Patent: April 19, 2005Assignee: Dainippon Printing Co., Ltd.Inventors: Chikao Ikenaga, Kouji Tomita
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Patent number: 6744118Abstract: A frame for a semiconductor package includes plural lead frames arranged through grid-leads in a matrix. Semiconductor devices are mounted on individual lead frames of the frame, and are molded with molding compound. Thereafter, the molded semiconductor devices are cut at grid-leads by means of a dicing saw so that individual semiconductor packages are obtained. The frame further has groove portions which are formed by etching the frame from the front or back at areas corresponding to grid-leads, so that the grid-leads are made thin which reduces burrs and the generation of metal powders and dust.Type: GrantFiled: May 7, 2001Date of Patent: June 1, 2004Assignee: Dainippon Printing Co., Ltd.Inventors: Chikao Ikenaga, Kouji Tomita
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Patent number: 6703694Abstract: A frame for semiconductor packages has die-pads supported with suspending leads of individual lead frames. Semiconductor devices are mounted on the respective die-pads. These semiconductor devices are collectively molded with molding compound, and then the collectively molded semiconductor packages are cut into individual packages by means of a dicing saw. In the frame, thin parts are formed in areas corresponding to the roots of individual terminals, the thin parts being formed by half-etching metal of the areas from the front or back thereof. Alternatively, hollows are formed in areas corresponding to the roots of individual terminals.Type: GrantFiled: May 7, 2001Date of Patent: March 9, 2004Assignee: Dainippon Printing Co., Ltd.Inventors: Chikao Ikenaga, Kouji Tomita
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Patent number: 6703696Abstract: A semiconductor package is comprised of a semiconductor device 4 mounted on a die-pad 3, a wire 6 for electrically connecting some electrodes of the semiconductor device 4 and terminals 5 of lead frame, wires 8 for bonding the other electrodes of semiconductor device to the surface of die-pad for grounding, and molding compound 7 for encapsulating the outer area of semiconductor device 4 under a state where the back face of die-pad 3. The lower face and side face of terminals 5 are exposed, wherein portions plated with silver for connecting of wires on the surface of the die-pad are formed at points positioned between a peripheral edge of the die-pad and an outer edge of the semiconductor device while leaving spaces from both the edges. The adhesion of die-pad 3 to bonding compound 7 is improved to avoid the occurrence of wires coming-off even if heat is applied to the contact points of die-pad 3 to wires 8 when mounting semiconductor package on a printed circuit board.Type: GrantFiled: August 31, 2001Date of Patent: March 9, 2004Assignee: Dainippon Printing Co., Ltd.Inventors: Chikao Ikenaga, Kouji Tomita, Tsuyoshi Tsunoda
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Publication number: 20030098503Abstract: A frame F for semiconductor package has die-pads 3 supported with suspending leads 2 of individual lead frames 10. Semiconductor devices are arranged on die-pads 3. These semiconductor devices are collectively molded with molding compounds, and then the collectively molded semiconductor packages are cut into individual packages by means of dicing saw. In the frame F, suspending leads are formed into fish tails, wherein at least one of longitudinal grid-lead and transverse grid-lead is eliminated within areas enclosed with fish tails of the suspending leads 2. Accordingly, whether R-shape generated by producing frame for semiconductor package by etching process is large or small, to exist metal piece at edges of semiconductor packages in dicing becomes almost nothing.Type: ApplicationFiled: January 13, 2003Publication date: May 29, 2003Applicant: Dainippon Printing Co., Ltd.Inventors: Chikao Ikenaga, Kouji Tomita
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Publication number: 20020149090Abstract: A lead frame of the present invention is a lead frame used for the production of semiconductor package, wherein each of terminals to be wire-bonded of the lead frame between electrodes provided on the top surface of semiconductor device mounted on a die pad and the terminals has one or two groove(s) for limiting plating area of noble metal for wire-bonding. A semiconductor package of the present invention is produced using the lead frame. Since grooves are provided in each terminal, the accuracy of plating area can be easily checked by visual observation. Accordingly, the cut of inspection cost can be carried out. Further, the grooves absorb stress applied to terminal when molded semiconductor packages are separated individually from each other by means of punching or dicing. Accordingly, coming off of molding compound from terminal is prevented.Type: ApplicationFiled: March 21, 2002Publication date: October 17, 2002Inventors: Chikao Ikenaga, Kouji Tomita
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Publication number: 20020048851Abstract: Semiconductor devices are mounted on die-pads supported with suspending leads of lead frames, and wire-bonding of electrodes provided on the top face of semiconductor devices to terminals of lead frames is made. Then, semiconductor devices are individually molded. Thereafter, individually molded semiconductor devices are stamped out to form individual semiconductor packages. In the above-mentioned process for making a semiconductor packages, resin tapes are stuck on the backside of terminals prior to the molding process, and the resin tapes are removed after the molding process. Since resin passes around behind terminals during the molding process, the occurrence of thin burrs on the backside of terminals are not found. Further, the satisfactory soldering plating in the mounting process of semiconductor packages can be secured without the process for removing burrs from the backside of terminals in which the process for removing burrs has been carried out conventionally.Type: ApplicationFiled: July 13, 2001Publication date: April 25, 2002Inventors: Chikao Ikenaga, Kouji Tomita
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Publication number: 20020027297Abstract: A semiconductor package is comprised of a semiconductor device 4 mounted on a die-pad 3, a wire 6 for electrically connecting some electrodes of the semiconductor device 4 and terminals 5 of lead frame, wires 8 for bonding the other electrodes of semiconductor device to the surface of die-pad for grounding, molding compound 7 for encapsulating the outer area of semiconductor device 4 under a state where the back face of die-pad 3, the lower face and side face of terminals 5 are exposed, wherein portions for plated with silver connecting of wires on the surface of the die-pad are formed at points positioned between a peripheral edge of the die-pad and an outer edge of the semiconductor device with leaving spaces from both the edges. The adhesion of die-pad 3 to bonding compound 7 is improved so that no trouble of coming-off of wires occur even if heat is applied to the contact points of die-pad 3 to wires 8 when mounting semiconductor package on a printed circuit board.Type: ApplicationFiled: August 31, 2001Publication date: March 7, 2002Inventors: Chikao Ikenaga, Kouji Tomita, Tsuyoshi Tsunoda
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Publication number: 20010045630Abstract: A frame F for semiconductor package has die-pads 3 supported with suspending leads 2 of individual lead frames 10. Semiconductor devices are mounted on die-pads 3. These semiconductor devices are collectively molded with molding compounds, and then the collectively molded semiconductor packages are cut into individual packages by means of dicing saw. In the frame F, thin parts are formed in areas corresponding to neighborhood of the roots of individual terminals, the thin parts being formed by half-cutting by etching metal of the areas from the front or back thereof. Or, hollows are formed in areas corresponding to neighborhood of the roots of individual terminals, Accordingly, it is inhibited that increased sectional area of terminals is formed, so that intervals between adjacent terminals 5 are sufficiently kept. Accordingly, accidents such as soldered bridge do not occur.Type: ApplicationFiled: May 7, 2001Publication date: November 29, 2001Inventors: Chikao Ikenaga, Kouji Tomita
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Publication number: 20010045628Abstract: A frame F for semiconductor package has die-pads 3 supported with suspending leads 2 of individual lead frames 10. Semiconductor devices are arranged on die-pads 3. These semiconductor devices are collectively molded with molding compounds, and then the collectively molded semiconductor packages are cut into individual packages by means of dicing saw. In the frame F, suspending leads are formed into fish tails, wherein at least one of longitudinal grid-lead and transverse grid-lead is eliminated within areas enclosed with fish tails of the suspending leads 2. Accordingly, whether R-shape generated by producing frame for semiconductor package by etching process is large or small, to exist metal piece at edges of semiconductor packages in dicing becomes almost nothing.Type: ApplicationFiled: May 7, 2001Publication date: November 29, 2001Inventors: Chikao Ikenaga, Kouji Tomita
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Publication number: 20010042904Abstract: Frame F comprises plural lead frames 10 arranged through grid-leads L in matrix. Semiconductor devices are mounted on individual lead frames 10 of frame F, respectively and collectively molded with molding compound. Thereafter, the collectively molded semiconductor devices are cut at grid-leads L by means of dicing saw so that individual semiconductor packages are obtained. The frame F further has groove portions. The groove portions are formed by half-cutting by etching a metal of frame F from the front or back at areas corresponding to grid-leads, so that grid-frames are made thin. When a width of groove portions is larger than a width of dicing saw, cut burrs are reduced. When a width of groove portions is smaller than a width of dicing saw, the occurrence of metal powder dusts is restrained and time required for cutting becomes smaller.Type: ApplicationFiled: May 7, 2001Publication date: November 22, 2001Inventors: Chikao Ikenaga, Kouji Tomita
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Patent number: 6051735Abstract: There is disclosed a process for prevention the polymerization of a vinyl compound selected from acrylic acid and methacrylic acid which comprises allowing at least one corrosion inhibitive substance selected from an alcohol and inorganic acid or salt thereof, an aromatic carboxylic acid or salt thereof and a zinc-containing salt to coexist with a metallic salt of dithiocarbamic acid, in prevention the polymerization of the vinyl compound with the metallic salt of dithiocarbamic acid.Type: GrantFiled: December 15, 1998Date of Patent: April 18, 2000Assignee: Idemitsu Petrochemical Co., Ltd.Inventors: Kenji Okamoto, Takashi Nakagawa, Hideaki Mimaki, Kouji Tomita
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Patent number: 5886220Abstract: There is disclosed a process for preventing the polymerization of a vinyl compound which comprises allowing water in an amount of 0.05 to 5% by weight based on the vinyl compound or a corrosion inhibitive substance selected from an alcohol, an inorganic acid or its salt, an aromatic carboxylic acid or its salt and a zinc-containing salt in an amount of preferably 0.01 to 5% by weight based on the same, to coexist with a metallic salt of dithiocarbamic acid, in preventing the polymerization of the vinyl compound with the metallic salt of dithiocarbamic acid. The above process makes it possible to effectively inhibit the polymerization of acrylic acid, methacrylic acid, etc. in the distillation system, etc. of the production process for the above acids as well as the corrosion of the equipment and machinery to be used therein and also to assure long-term stable continuous operation of the equipment and machinery.Type: GrantFiled: March 5, 1997Date of Patent: March 23, 1999Assignee: Idemitsu Petrochemical Co., Ltd.Inventors: Kenji Okamoto, Takashi Nakagawa, Hideaki Mimaki, Kouji Tomita
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Patent number: 5856568Abstract: A process for inhibiting polymerization of a vinyl compound comprising using (A) one or both of N-nitrosophenylhydroxylamine and a salt thereof in combination with (B) a salt of copper or in combination with (B') a metal salt of a dialkyldithiocarbamic acid and (C) at least one selected from the group consisting of inorganic acids, salts of inorganic acids, and water.In accordance with the above process, stable continuous operation of a process for producing a vinyl compound, particularly acrylic acid or methacrylic acid, such as a distillation process of the vinyl compound, for a long time is enabled by effectively suppressing polymerization of the vinyl compound in the process or by effectively suppressing polymerization of the vinyl compound in the process while corrosion of the apparatus for the production is prevented.Type: GrantFiled: May 30, 1997Date of Patent: January 5, 1999Assignee: Idemitsu Petrochemical Co., Ltd.Inventors: Kenji Okamoto, Takashi Nakagawa, Kouji Tomita
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Patent number: 4835308Abstract: A process for producing trimellitic acid by oxidizing pseudocumene with a molecular oxygen-containing gas in an acetic acid solvent in the presence of a catalyst comprising one or more cobalt compounds, one or more manganese compounds, and one or more bromine compounds, wherein the total amount of the cobalt compound is in the range of 0.01-1.0% by weight of the acetic acid solvent based on the weight of cobalt metal, the total amount of the manganese compound is in the range of 0.01-0.1% by weight of the acetic acid solvent based on the weight of manganese metal, the total amount of the bromine compound is in the range of 0.01-2.0% by weight of the acetic acid solvent based on the weight of bromine atoms, with the proviso that the atomic ratio of bromine to cobalt and manganese [Br/(Co+Mn)] is in the range of 2.51-2.99, which process comprises at least two reaction-stages comprising the preceding reaction-stage in which the reaction temperature is maintained in the range of 110.degree. to 180.degree. C.Type: GrantFiled: September 4, 1987Date of Patent: May 30, 1989Assignee: Idemitsu Petrochemical Co., Ltd.Inventors: Yasuzo Sakakibara, Ken-ichi Ueda, Kouji Tomita