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    • 56. 发明专利
    • MANUFACTURE OF CIRCUIT
    • JPH04217386A
    • 1992-08-07
    • JP41130190
    • 1990-12-18
    • FURUKAWA ELECTRIC CO LTD
    • MUGISHIMA TOSHIOSEKI OSAMUOTANI KENICHI
    • H01L21/60H05K3/06
    • PURPOSE:To provide a method thereby to prepare easily a microcircuit which is excellent in terms of reliability and electric properties on an insulation board. CONSTITUTION:As illustrated in Fig. 1(a), a groove is formed on a section which serves as a circuit on an insulation board 1. Copper 3 is sputtered to the surface of the insulation board 1 which includes this groove so as to provide electrical conductivity as illustrated in Fig. 1(b). Then, electrolytic plating is applied to the insulation board which contains the groove so that the groove section may be filled with a conductor 4 as illustrated in Fig. 1(c), and then an unnecessary part of a surface conducting layer is etched and removed so that the conductor upper part of he groove section may be exposed as illustrated in Fig. 1(d). Then, the thickness of the insulation board 1 is reduced by etching at least partially so that the conductor in the groove section may be exposed from the surface of the insulation board 1 by a required height, thereby forming a circuit as illustrated in Fig. 1(e).
    • 57. 发明专利
    • PRODUCTION OF CHIP CARRIER
    • JPH04215448A
    • 1992-08-06
    • JP41064190
    • 1990-12-14
    • FURUKAWA ELECTRIC CO LTD
    • OTANI KENICHIMUGISHIMA TOSHIOSEKI OSAMU
    • H01L21/60
    • PURPOSE:To reduce the cost by covering the surface on the opening side of a metal thin film with another insulating flexible layer thicker than a flexible film member and forming metal wiring by etching the metal thin film. CONSTITUTION:For a base film 2, an area 6 which forms the thin part on a part to be bent is punched out to form an opening using an adhesive polyimide film. Copper foil is laminated on the base film 2 and a metal thin film is formed. An area surrounded by the circumference including the opening is coated with urethane ultraviolet hardening resin and a resin layer 11 is formed. Then, photoresist is coated on the copper foil side, dried, exposed and developed by a prescribed pattern. Resist is coated on the whole plane on the base film 2 side, the copper foil is etched and metal wiring 3 is formed. Then, the resist films on the both planes are removed, tin plated and a chip carrier which has a thin part 6 composed of the resin layer 11 on the part to be bent is produced.
    • 58. 发明专利
    • THIN-WALL INSULATED WIRE
    • JPS63307608A
    • 1988-12-15
    • JP14139787
    • 1987-06-08
    • FURUKAWA ELECTRIC CO LTD
    • NISHIYAMA HIDEMIOTANI KENICHI
    • H01B3/30H01B3/44
    • PURPOSE:To enable a thin-wall insulated wire, which is excellent in the characteristics, such as abrasion resistance and the like, and inexpensive in the material cost, to be obtained by using as the coating material a resin composition substance, in which styrene resin and ethylene-vinyl acetate copolymer are combined with polyurethane resin having the Shore 'D' hardness of 60 or more. CONSTITUTION:A conductor is coated with a resin composition substance, which is comprised of 50-90% by weight of polyurethane resin having the Shore 'D' hardness of not less than 60 and 5-45% by weight of ethylene-vinyl acetate copolymer, to the thickness of not more than 0.3mm. Hereupon, it is desirable that not less than 60% by weight of polyurethane resin having the Shore 'D' hardness of not less than 60 is combined therewith. Thereby, it is made possible to obtain a thin-wall insulated wire which is thin in its coating thickness, and excellent in such characteristics as abrasion resistance and the like, and moreover, equal in the cost to vinyl-chloride-resin insulated wires.