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US 4,068,285 AGranted
Variable capacitor
AssigneeKabushiki Kaisha Suwa Seikosha
InventorsKuniharu Yamada, Yukio Morozumi, Keiichi Iuchi
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AssigneeKabushiki Kaisha Suwa Seikosha
InventorsKuniharu Yamada, Yukio Morozumi, Keiichi Iuchi
Estimating the term…
A variable capacitor is provided wherein a reinforcing plate is utilized in the rotor assembly in order to increase the range of the capacitor. The capacitor includes the stator plate and first electrode, the stator plate supporting a lead pin and a rotor positioning member, the rotor positioning member being rotatably mounted thereon. The rotor positioning member rotatably supports a uniformly thick rotor assembly in rotatable friction contact with the stator plate and first electrode. The rotor assembly includes a dielectric, a second capacitor electrode and a reinforcing plate, the thickenss of the dielectric determining the minimum value of capacitance of the variable capacitor. The rotor assembly also includes a fixed spring secured to the positioning member, the lead pin and fixed spring being adapted to facilitate use of variable capacitor in small-size electronic instrumentation.
A variable capacitor comprising stator means including a supporting plate, first capacitor electrode, and an adhesive means for securing said first capacitor electrode to said stator supporting plate, rotor means including a positioning member rotatably mounted on said stator plate, said positioning member rotatably supporting a rotor assembly of uniform thickness for rotation therewith in friction contact with said stator means, said rotor assembly including a dielectric layer in friction engagement with said first electrode, a second capacitor electrode, and a reinforcing plate on the side of the dielectric having an opening therein for receiving said positioning member and a second electrode spaced from the first electrode for supporting said dielectric layer, said reinforcing plate having a lower dielectric constant than said dielectric layer, and an adhesive means for securing said dielectric layer. second capacitor electrode and reinforcing plate together, and electrically conductive securing means coupled to said posisitioning member and said second capacitor electrode, said positioning member including a top portion having a circular notch in the surface portion thereof in contact with the rotor assembly to thereby prevent breakage of the reinforcing plate at the portion thereof defining the position member receiving opening.
A variable capacitor comprising stator means including a supporting plate, first capacitor electrode, and an adhesive means for securing said first capacitor electrode to said stator supporting plate, rotor means including a positioning member rotatably mounted on said stator plate, said positioning member rotatably supporting a rotor assembly of uniform thickness for rotation therewith in friction contact with said stator means, said rotor assembly including a dielectric layer in friction engagement with said first electrode, a second capacitor electrode, and a reinforcing plate on the side of the dielectric having an opening therein for receiving said positioning member and a second electrode spaced from the first electrode for supporting said dielectric layer, said reinforcing plate having a lower dielectric constant than said dielectric layer, and an adhesive means for securing said dielectric layer, second capacitor electrode and reinforcing plate together, and electrically conductive securing means coupled to said positioning member and said second capacitor electrode, said positioning member including a top portion having a first annular gooove along the side wall thereof, said groove being adapted to receive said conductive securing means therein, the top surface of said positioning member including a further groove facilitating further rotation of said positioning member, said top surface of said positioning member being devoid of said conductive securing means.
Dependencies are inferred from the claim text.