Variable resistor
AssigneeAlps Electric Co., Ltd.
InventorsTakeshi Ohtani, Susumu Nishimura, Kozo Magami, Katsuhisa Osada
Life of this patent
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Abstract
In a variable resistor of the type wherein there is formed on an insulating substrate a resistive member having wide portions and narrow portions in the sliding direction of a slide member and ends thereof wired respectively to a ground terminal and an input terminal. A plurality of contact elements formed on said slide member are brought into sliding contact with said resistive member and a high resistance film allowing the passage of electrostatic charges therethrough is formed at portions of said insulating substrate lying within the sliding passage of said contact elements so that a part of said contact elements comes into contact therewith when it comes off from said resistive member.
Claims2
A variable resistor having an insulating substrate;
- a resistive member carried on said insulating substrate and having a width varying in the longitudinal direction thereof;
- a first terminal section formed on said insulating substrate and connected to an output terminal;
- a second terminal section connected to one end portion of said resistive member;
- a third terminal section connected to the other end portion of said resistive member;
- a slide member connected to said first terminal section and having a plurality of contact elements sliding on said resistive member;
- and a high resistance film formed on said insulating substrate, said high resistance film underlying said resistive member and having a surface resistance of about 1.times.10.sup.7 to 1.times.10.sup.9 ohms per square centimeter so as to come into contact with a part of said contact elements at the portion of a narrow width of said resistance member and neutralize the adverse effects of any static electricity generated by the movement of said contact elements.
Dependencies are inferred from the claim text.