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    • 2. 发明专利
    • MANUFACTURE OF SEMICONDUCTOR DEVICE
    • JPH02288232A
    • 1990-11-28
    • JP10767589
    • 1989-04-28
    • HITACHI LTDHITACHI VLSI ENG
    • AKASAKI HIROSHIISHIDA TAKASHITATE HIROSHI
    • H01L21/3213H01L21/3205H01L21/321H01L21/60
    • PURPOSE:To shorten a manufacturing process by forming insulating protective films as a lower layer and an upper layer onto the metallic wiring layer of a flip-chip electrode section and an external exposed pad section and simultaneously conducting the etching process of the machining of the upper-layer insulating protective film with the flip-chip electrode section and the external exposed pad section. CONSTITUTION:An SiO2 film 7 as an upper-layer insulating protective film is shaped onto the surfaces of an opened flip-chip electrode section 2 and an external exposed pad section 3. The SiO2 film 7 of the flip-chip electrode section 2 and the external exposed pad section 3 is opened through wet etching by a hydrofluoric acid group etchant. Since the etching rates of the SiO2 film 7 of the upper-layer insulating protective film and the Si3N4 film 6 of a lower-layer insulating protective film differ and the etching rate of the Si3N4 film 6 is made lower than that of the SiO2 film 7 by approximately centuple at that time, the etching of the external exposed pad section 3 progresses only up to the surface of the lower-layer insulating film, and the Si3N4 film 6 is not etched. Since the SiO2 film 7 formed to the flip-chip electrode section 2 and the external exposed pad section 3 can be opened simultaneously through wet etching, the upper-layer insulating protective film can be machined at a time.
    • 5. 发明专利
    • METHOD FOR FORMING PROTRUDENT ELECTRODE
    • JPH03250629A
    • 1991-11-08
    • JP4545890
    • 1990-02-28
    • HITACHI LTDHITACHI VLSI ENG
    • AKASAKI HIROSHIISHIDA TAKASHI
    • H01L21/60H01L21/321
    • PURPOSE:To simplify a process and attain a refined pitch and further, reduce a cost by covering the whole surface of a wafer after forming base metallic parts with a metallic film for forming protrudent electrodes and then, forming the protrudent electrodes selectively on the base metallic parts through partitioning the metallic film for forming protrudent electrodes. CONSTITUTION:A protection film 2 on electrodes 1 is bored, and BLMs(Ball Limiting Metalization) 3 are formed thereon. Then, a solder film 4 of a desired film thickness and a desired composition is formed by a vacuum evaporation and the like. A groove 6 for partitioning the solder film is formed on the boundary between the solder films 4 by projecting a laser beam 5 on it. By heating the solder films 4 to a solder fusing temperature after coating the surfaces of the solder films 4 with fluxes, semi-spherical solder bumps 7 are obtained on the BLMs 3 by virtue of surface tensions. Making the groove 6 for partitioning the solder film form the boundary, the solder film 4 shrinks into the right and left part respectively. Then, they change into sphere-like parts, each of which forms the shape in that the surface area is shrinked into the minimum one, on the BLMs 3 having good wettabilities for the solder films. In such a manner, by the fine working using the laser beam, the solder film formed on the whole surface of a wafer is partitioned all over the surface, and can be changed into the solder bumps.
    • 6. 发明专利
    • SEMICONDUCTOR DEVICE COOLING METHOD AND SEMICONDUCTOR DEVICE
    • JPH0330457A
    • 1991-02-08
    • JP16398089
    • 1989-06-28
    • HITACHI LTDHITACHI VLSI ENG
    • AKASAKI HIROSHIISHIDA TAKASHIOTSUKA KANJI
    • H01L23/427
    • PURPOSE:To improve a semiconductor device in cooling efficiency and reliability, to make a cooling structure simple and miniaturized, and to protect it against corrosion and contamination caused by coolant by a method wherein specific liquid is supplied to the heat releasing part of the semiconductor device and vaporized, and the heat releasing part is cooled by latent heat of vaporization. CONSTITUTION:Specific liquid 4 is supplied to a heat releasing part 2b of a semiconductor device and vaporized, and the heat releasing part 2b is cooled by the latent heat of vaporization. For instance, liquefied CO2 4 spouted out from a liquid feed opening 3a of a liquid feed nozzle 3 is uniformly sprayed on the rear side 2b of the semiconductor chip 2, and when the fine particles of liquefied CO2 4 are vaporized, they absorb heat released from the rear side 2b of the semiconductor ship 2 as latent heat of vaporization, whereby heat exchange takes place at the surface to turn liquefied CO2 into CO2 gas 5 to cool the semiconductor chip 2. Vaporized CO2 gas 5 is exhausted through an exhaust vent 8 of a vaporizing chamber 7, introduced into a compression liquidizing mechanism 10 passing through a circulation tube 9, liquefied by compression and returned to the liquid feed nozzle 3, and spouted out again from the liquid feed opening 3a against the rear side 2b of the semiconductor chip 2.