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    • 1. 发明专利
    • PACKAGING MATERIAL FOR ELECTRONIC PARTS CUSTODY BAGS
    • JPS6490743A
    • 1989-04-07
    • JP24926387
    • 1987-10-02
    • FUJITSU LTDFUJIMORI KOGYO CO
    • OTAGURO HIROYUKISHINJO MAMORUHIRATA JUNICHI
    • H01B17/64B32B7/02B32B7/12B32B15/08B65D85/38B65D85/86
    • PURPOSE:To obtain a packaging material having an excellent antistatic property, stable air-tightness and stable moisture vapor resistance, by forming an antistatic layer on the outside of a synthetic resin film layer and an air-tight and moisture-vapor- resistant layer inside of the said synthetic resin film layer, and laminating in turn the said synthetic resin film layer as the outermost layer, a synthetic resin film layer having a metal foil and a hot-glueable resin layer. CONSTITUTION:A packaging material 10 used for manufacturing electronic parts custody bags is the material made by laminating in turn a synthetic resin film layer 1, having an antistatic layer 1A formed on its outside and an air-tight and moisture- vapor-resistant layer 1B formed on its inside, as the outermost layer, a synthetic resin layer 3 having a metal foil 3A and a hot-glueable resin layer 4. The synthetic resin film layer 1 is a film of polyester, nylon etc., and the antistatic layer 1A is made by solving an antistatic agent such as anionic activator and the like in a solvent to make a solution and coating the surface of the said synthetic resin film layer 1 with the solution. The air-tight and moisture-vapor-resistant layer 1B is formed by coating the opposite side to the antistatic layer 1A of the synthetic resin film layer 1 with polyvinyliden chloride. For the antistatic purpose, carbon black, a various kinds of surfactants etc. may be added to and mixed with the heat bonding resin layer 4.
    • 6. 发明专利
    • PRINTED WIRING BOARD UNIT
    • JPH0430497A
    • 1992-02-03
    • JP13415390
    • 1990-05-25
    • FUJITSU LTD
    • OTAGURO HIROYUKINOKIMURA HITOSHIUEHARA EIKO
    • H05K3/46
    • PURPOSE:To make a printed wiring board unit small in size by a method wherein a heat dissipating block is provided only to a position correspondent to a semiconductor component, and I/O sections are provided to the surface of an insulating board on which the heat dissipating block is bonded. CONSTITUTION:I/O pins 46 used for electrically connecting a semiconductor module 48 with a printed wiring board can be arranged not only on the periphery of the insulating board 32 but also on the comparatively inside part of the board 32. Therefore, pads or the like used for electrically connecting the module 48 with the wiring board 44 are not required to be provided outside the component mounting area of the module 48, so that the board 44 can be made small in size. The thickness of a printed wiring board unit conforms to that of the module 48, so that it can be formed thinner than usual. A heat dissipating block 42 is provided only to a part of the board 32 where semiconductor component is provided, so that a base is small in area, and when the block 42 is bonded to the board 32, air bubbles are hardly induced in adhesive agent and a printed wiring board can be prevented from deteriorating in heat dissipating property due to the air bubbles concerned.
    • 7. 发明专利
    • RESTORATION OF MULTILAYER CIRCUIT BOARD
    • JPH03263394A
    • 1991-11-22
    • JP6155990
    • 1990-03-13
    • FUJITSU LTD
    • OTAGURO HIROYUKI
    • H05K3/46
    • PURPOSE:To restore not only a conductor pattern on the uppermost layer but also a pattern on a lower layer by a method wherein at least two desired places on a surface insulating layer are irradiated with a laser, holes reaching the conductor pattern on the lower layer are made, a connecting route connecting the holes is formed on the surface of the surface insulating layer, and a restoration pattern composed of a thick film is formed on the surface insulating layer. CONSTITUTION:Two places whose connection is required on a surface insulating layer 70 are first irradiated with a laser; holes 81, 82 reaching a conductor pattern 50 on the uppermost layer are made. A conductor paste is screen-printed by using a mask provided with a pattern which bypasses pads 90 and which connects the holes 81, 82; and after that, it is baked. A via 81A formed in the hole 81 is connected to a via 82A formed in the hole 82. A restoration pattern 80 composed of a thick film is formed. That is to say, without exfoliating the surface insulating layer 70, a starting hole for a via 9 is made in the surface insulating layer 70 and in an insulating layer at a lower layer as required; the starting hole is filled with a conductor paste; and the via 9 is formed and the restoration pattern 80 is formed. Thereby, the restoration pattern 80 can be formed easily and at a low cost.
    • 10. 发明专利
    • Optical signal transmitting and receiving device
    • 光信号发射和接收设备
    • JPS6188624A
    • 1986-05-06
    • JP20835784
    • 1984-10-05
    • Fujitsu Ltd
    • YOKOYAMA TORUSHIRAI MAMORUOTAGURO HIROYUKI
    • H05K9/00H04B10/00H04B10/112H05K1/00H05K1/02H04B9/00
    • H04B10/803H05K1/0218H05K1/0298
    • PURPOSE:To improve the S/N of a receiving circuit by providing an optical transmission circuit on the single side of a printed distribution board containing a shielding layer and an optical reception circuit on the other side of the distribution board respectively. CONSTITUTION:A circuit which converts an electric signal into an optical signal is set on a single side of a printed distribution board by means of said distribution board containing a shielding layer L3 as a substrate. At the same time, a photodetecting element which receives an optical signal and converts it into an electric signal is set on the other side of the distribution board together with a circuit which amplifies the received electric signal. The circuits having a large amount of current consumption and set at the transmission side are separated from the circuits provided at the reception side and set on both sides of the distribution board. Therefore the reception circuit is isolated electrostatically from the transmission circuit. In such a way, the S/N is improved.
    • 目的:通过在分配板的另一侧分别在包含屏蔽层和光接收电路的印刷配线板的单面上提供光传输电路来提高接收电路的信噪比。 构成:将电信号转换为光信号的电路通过包含屏蔽层L3作为基板的所述分配板设置在印刷配线板的单面上。 同时,将接收光信号并将其转换成电信号的光电检测元件与放大接收的电信号的电路一起设置在配电板的另一侧。 具有大量电流消耗且设置在发送侧的电路与设置在接收侧的电路分离并设置在配电板的两侧。 因此,接收电路是从传输电路静电隔离的。 以这种方式,S / N得到改善。