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    • 4. 发明专利
    • SEMICONDUCTOR DEVICE PROVIDED WITH STRUCTURE FOR FITTING RADIATING PLATE
    • JPH11345925A
    • 1999-12-14
    • JP13609899
    • 1999-05-17
    • ROHM CO LTD
    • FURUNO TOMOMIINOUE KOICHI
    • H01L23/40
    • PROBLEM TO BE SOLVED: To shorten working step and improve manufacturing efficiency by forming an engaging part which can be inserted into and engaged with a hole provided in an external radiating plate in a manner to be projected from the heat radiating part, and bringing it into contact with the heat radiating part and a resin formation part other than the heat radiating part in a state where the radiating plate is engaged with the engaging part. SOLUTION: An engaging pin 15 is comprised of a head 15a and a cylinder 15b which is smaller than the head 15a, and the entirely wedge-shaped head 15a is divided into four to form clearances 15c, and further it is made of flexible material so as to change the size of the clearance 15c freely. When the head 15a is inserted into a hole 4a, the clearance 15c becomes small, and when it is projected from the backside of the radiating plate 4, the size thereof is restored to the original state and the engagement is completed. Thus, the engaging pin 15 formed in a resin formation body 12 and the hole 4a formed on the radiating plate 4 can be engaged with each other, so that the radiating plate 4 can be fitted to a semiconductor device 11 through one action.
    • 6. 发明专利
    • PROTECTING CIRCUIT FOR OUTPUT TRANSISTOR
    • JPH1013161A
    • 1998-01-16
    • JP16761496
    • 1996-06-27
    • ROHM CO LTD
    • FURUNO TOMOMI
    • H03F1/52H03K17/082
    • PROBLEM TO BE SOLVED: To drastically reduce load current, even when an output voltage is cramped by means of a low voltage owing to abnormality in a load circuit by reducing the conductive biases of an output transistor and a monitor transistor when the voltage generated at a prescribed point becomes more than a prescribed level. SOLUTION: When output current I0 increases, current I flowing in the output transistor Q1 increases, and current I/n flowing in the monitor transistor Q2 also increases. Therefore, the voltage generated at a g-point becomes more than the threshold values of the transistor Q3 and Q4, so as to turn on the transistors Q3 and Q4. Since current I is permitted to flow from the k-point of a first comparator 1 to the transistor A3 by the turning-on of the transistor Q3, the collector current I1 of the transistor T8 is decreased. The conductive degree of the transistors Q1 and Q2 is lowered by the decrease in current I1 , and respective currents I and I/n are reduced. Thus, even when current I is made to flow, its rush current is quickly restricted.
    • 8. 发明专利
    • SEMICONDUCTOR DEVICE
    • JPH07273282A
    • 1995-10-20
    • JP6049994
    • 1994-03-30
    • ROHM CO LTD
    • FURUNO TOMOMIOTANI KENJIINOUE KOICHIYAMAZAKI KOICHINAGANUMA KEISUKE
    • H01L21/822H01L27/04
    • PURPOSE:To provide a semiconductor device in which an arrangement is not limited, whose cost can be lowered and whose reliability is high. CONSTITUTION:Heat-generating semiconductor elements (a first PNP transistor 20 and a second PNP transistor 30) which generate heat in their operation and control parts (a resistor 40 and an NPN transistor 50) which control them are formed inside a substrate 1. After that, a heat isolation groove 60 is formed between the first PNP transistor 20 and the resistor 40 by a laser cutter. A substance whose heat conductivity is low is filled into the heat isolation groove 60 which has been formed. Thereby, heat which is generated from the first PNP transistor 20 is not conducted to the resistor 40, and a change in a control characteristic due to heat is not generated between the resistor 40 and the NPN transistor 50. The heat-generating semiconductor elements and the control parts are isolated thermally from each other, it is not required to arrange the heat-generating semiconductor elements and the control parts by taking their positions into consideration, and it is not required to install the heat-generating semiconductor elements and the control parts on separate substrates.