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    • 6. 发明专利
    • DE2248598A1
    • 1973-04-19
    • DE2248598
    • 1972-10-04
    • KATO ICHIRO
    • SUGANO TAKUOMORI YOSHIFUMI
    • H01L21/31H01L21/316H01L21/76H01L33/30H01L33/44H01L1/10
    • 1377678 Insulating layers on semi-conductors I KATO 27 Sept 1972 [6 Oct 1971] 44573/72 Heading H1K A compound semi-conductor body is oxidized by exposure to an electric discharge in a low pressure (e.g. 0À1-1À0 torr) oxidizing atmosphere using a field which produces a bright white light. In the arrangement shown selected areas 12 of a GaAs body comprising an epitaxial layer 10 on a semi-insulating substrate 9 are thus oxidized through a photo-etched Al mask 11 which is subsequently removed. The oxide layers made in accordance with the invention may form passivation or isolation regions for single devices or integrated circuits, gate insulation in FETs or masks against diffusion or ion implantation. An MOS diode formed of discharge-oxidized boatgrown GaAs having an Al electrode on the oxide layer, an Ag-on-Sn ohmic electrode on a roughened surface of the GaAs body and Au leads attached to the electrodes is also described. GaP and GaAs x P 1-x are referred to.
    • 9. 发明专利
    • WINDING METHOD FOR AUDIO-FREQUENCY TRANSFORMER
    • JP2002343642A
    • 2002-11-29
    • JP2001148924
    • 2001-05-18
    • KATO ICHIRO
    • KATO ICHIRO
    • H01F41/04H01F17/04H01F19/00
    • PROBLEM TO BE SOLVED: To solve such a problem, that when the primary and secondary windings of an output transformer are wound into an intricate multilayered and multi-division sandwich, in order to improve the characteristics of the transformer in high-frequency band, the thickness of the secondary winding cannot be increased due to the thickness relation of the window of a core, and consequently, the power efficiency of the trans former is deteriorated by an increased DC resistance on the secondary side and an increased internal loss. SOLUTION: In a winding method for audio-frequency transformer, the DC resistance of the output transformer is reduced and the high-frequency characteristics of the transformer are improved by using copper wires, having different thicknesses as the secondary winding of the transformer and putting the thinner secondary winding in between the thicker secondary winding and primary winding. When this method is used, the secondary winding having a lower DC resistance can be wound on the inside, outside, or both the inside and outside of the primary winding, resulting in a widened selection width. It is better, in addition, to wind the thinner secondary winding put between the turns of the primary winding in one or a plurality of stages, by taking the thickness of the core and the thickness, high-frequency characteristic, etc., of the primary winding into consideration.