Variable resistance attenuator
AssigneeNippon Electric Co., Ltd.
InventorHisashi Honda
Life of this patent
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Abstract
A variable-resistance attenuator having first and second resistive layers deposited upon an insulating substrate. Input and output terminals are electrically connected at spaced intervals to one of the resistive layers and a common terminal is electrically connected to the remaining one of the resistive layers. A pair of contacts are adapted to make slidable electrical engagement, each with an associated one of the resistive layers. Conductive bridging means mechanically and electrically connect the sliding contacts. Mechanical means are provided for simultaneous movement of the sliding contacts to change the resistance in a smooth and continuous fashion.
Claims11
A variable-resistance attenuator comprising a first resistive layer, a second resistive layer, first and second slidable contacts mechanically and electrically connected to one another and respectively disposed on the sufaces of said first and second resistive layers, input and output terminals provided at one end of said first resistive layer in the sliding direction of said first slidable contact, a common terminal provided at one end of said second resistive layer in the sliding direction of said second slidable contact, and means attached to said first and second slidable contacts for moving said first slidable contact in a first direction relative to said one end of said first resistive layer to vary the amount of electrical attenuation between said input and output terminals and for simultaneously moving said second slidable contact in an opposite direction relative to said one end of said second resistive layer to maintain the impedance between each of said input and output terminals and said common terminal at a constant value.
The variable-resistance attenuator according to cliam 1 wherein said first and second resistive layers are arranged in a line.
Dependencies are inferred from the claim text.