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    • 6. 发明专利
    • EXCITER
    • JP2000223333A
    • 2000-08-11
    • JP2346699
    • 1999-02-01
    • HITACHI LTD
    • KOSEKI SHOICHIROKUBO HIROSHI
    • H01F38/14
    • PROBLEM TO BE SOLVED: To make the capacity of a power supply small by constructing series resonance circuits in load units, adding AC voltage by inserting transformers in series with inductive circuit elements, and exciting only the AC current components by the resonance circuits. SOLUTION: In an exciter, secondary windings of choke transformers 41, 42 and 43 are inserted in series with electromagnets 11, 12 and 13, and AC voltage is added from the primary side by an AC power source 1, which is connected commonly in parallel to the primary winding of each choke transformer. Although the choke transformers 41, 42 and 43 may be inserted to a choke transformer 22 side, better control is obtained when they are coupled directly to the electromagnet current. When the choke transformers are connected to the choke transformer 22 side, they are inserted by being divided into two, with respect to the resonance circuit 81. The AC power source can be divided into each choke transformer, enabling adjustment of the voltage applied to each resonance circuit. If the resonance circuit 81 for inserting a DC power supply is made plural to result in a plurality of DC power sources, it is possible to reduce the voltage applied to the load.
    • 7. 发明专利
    • POWER SUPPLY DEVICE AND ACCELERATOR
    • JPH10289799A
    • 1998-10-27
    • JP9555797
    • 1997-04-14
    • HITACHI LTDHITACHI ENG CO LTD
    • KANAZAWA TORUKUBO HIROSHI
    • H05H7/04
    • PROBLEM TO BE SOLVED: To eliminate external adjustments for a power application start signal, a current-setting value or the like by forming a power supply for operation, in matching with a current setting value via a timing setting unit installed within the power supply itself. SOLUTION: A current-setting value Ir is preliminarily sent from a setting device 7 to a current instruction unit 2. When a power supply start signal (s) is sent from a timing generation device 8, a power supply start signal Sn for a power supply is outputted, and a current-setting value Ir is outputted from the current instruction unit 2 to a power supply control part 4. In addition, the power supply control part 4 sends output current Id to a load 9, according to the current-setting value Ir. An output current Id is detected with a current detector 5, and compared with the current setting value Ir in a deviation detector 6 for the calculation of a deviation ε. The deviation ε is fed back to the power supply control part 4, and control is made so that the output current Id approaches close to the current setting value Ir. Also, a deviation εcorresponding to a delay in the load 9 and the power supply control part 4, relative to the current-setting value Ir, is connected to the timing setting unit 3, thereby converting the deviation ε with time for quickly outputting the power supply start signal Sn for the power supply.
    • 8. 发明专利
    • RESIN MOLDING METHOD AND MOLDED MATERIAL
    • JPS6316629A
    • 1988-01-23
    • JP15960686
    • 1986-07-09
    • HITACHI LTD
    • KUBO HIROSHIHOSHI AKIRO
    • H01L23/48H01L21/56H01L23/50
    • PURPOSE:To enable a high-reliability semiconductor device to be obtained with good yield, by disposing air vents on a plurality of sides of cavities so that voids can be prevented from being formed inside a molded resin, together with avoiding short filling of resin. CONSTITUTION:A melting resin 10 is injected as shown by arrows of full lines in process of resin molding. Air existing in cavities of a molding metallic mold is exhausted from air vents of the molding iron mold as shown in two-dot chain lines and besides from air vents 9 formed on respective dams 5 of a lead frame 1. Because the air is thus exhausted from three sides of these air vents of the cavities shaped in rectangles, the air is effectively drawn out with out remaining in the cavities. Resultantly voids are hardly generated inside a package 8, and the recessed parts or the like are prevented from being generat ed on the surface of the package 8 due to the remaining foams. Thus, short filling of resin also hardly occurs.
    • 10. 发明专利
    • SEMICONDUCTOR DEVICE
    • JPS5678146A
    • 1981-06-26
    • JP14579480
    • 1980-10-20
    • HITACHI LTD
    • INOUE FUMIHITOKUBO HIROSHI
    • H01L23/50H01L23/495
    • PURPOSE:To obtain a small frame which has an improved thermal conductivity and a reduced thermal expansion efficiency, by a method wherein a lead frame whereon a simiconductor pellet is placed is formed with a composition having a silver layer through a copper layer on the surface of a core material whose main component is iron, such as kovar or iron nickel. CONSTITUTION:The structure of an IC reed frame W, consisting of a plurality of reeds A which have a head unit at their respective ends that turn inward, is formed as follows. A center part in the direction of thickness of the frame W is formed with a core material 1 made of a copal or iron nickel alloy which has an oblong shape and thickness of 200-300mum, and a copper layer 2, which is formed in minimum thickness of 1mum by a plating method or clad method, is adhered to the circumference of the core material. A silver layer 3, which is formed in thickness of 1mum or more by a plating method, is further adhered to the copper layer 2, and a copper layer 4 is adhered to the silver layer 3. The thickness of said layers covering the core material 1 is adjusted so as to be 10-50mum. This causes the frame W to be reduced in an expansion and contraction value produced due to thermal expansion.