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    • 38. 发明专利
    • SUBSTRATE FOR OSCILLATION CIRCUIT
    • JPH09181455A
    • 1997-07-11
    • JP35023095
    • 1995-12-21
    • HOKURIKU ELECT IND
    • NAGARE ICHIROAZUMA KOUJIISHIYAMA ICHIROKUROKAWA HIROYUKI
    • H05K3/46H03B1/00H03B5/02
    • PROBLEM TO BE SOLVED: To suppress a leakage current due to stray capacitance by a method wherein there is provided a capacitor having a pair of electrodes across an insulating substrate high in dielectric constant, a low dielectric constant substrate having smaller dielectric constant than that of the insulating substrate is stacked on a high dielectric constant substrate, and circuit patterns are formed on the front and back faces across both the substrates. SOLUTION: After an insulating substrate 12 is formed with resin of high dielectric constant and a circuit pattern 13 of copper foil is formed, an electric 16 forming a capacitor 14 facing an electrode 15 is formed on the reverse face side. An insulating substrate 20 of low dielectric constant is stacked on a reverse face of the substrate 12, and a circuit pattern 23 is formed on a face on the opposite side of the connection face. When an area of a portion being a generation cause stray capacitance by the circuit patterns 13, 23 is 4mm , the capacitance is represented by CS2 =εS.εO.S/d=1.35pF, it is 2.84pF in the prior art. When a voltage applied to the stray capacitance portion is V, a leakage current is represented by Ics=V/(1ωcs)=0.544 (conventional ratio) and the leakage current is improved by 46.5% to suppress the leakage current.