US4101951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable capacitor
Assignee: Murata Manufacturing Co Ltd
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Filing: 1976-07-28
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Granted: 1978-07-18
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Expires: 1996-07-28
Abstract
Abstract A variable capacitor for use in electrical and electronic equipment which includes a stator disposed on an insulating base, a stator terminal lead having an electrode portion fixed to the stator and a terminal end extending through the insulating base. The variable capacitor includes a metallic rotor rotatably disposed on the stator through a dielectric plate, a rotor terminal lead having a resilient spring portion disposed on the rotor and a terminal end extending through the base, and an insulating cap of hollow cylindrical shape fitted over the resilient spring portion of the rotor terminal lead. The insulating cap is rigidly connected to the base to form the variable capacitor of compact size with sufficiently large electrostatic capacity.
Inventors
- 👤 Saburo Kuze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:09
CPC Classifications
H; H01; H01G; H01G5/00; H01G5/01; H01G5/013; H01G5/0134; H01G5/0136
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
315 words
A variable capacitor for use in electrical and electronic equipment comprising: a substantially circular disc-like stator member of electrically insulating plastic material to which a stator electrode is secured thereto, said stator electrode including a stator terminal end and a stator terminal lead which form a single monolithic element; a rotor member of electrically conductive material including one surface which mates with and is rotatably disposed on a dielectric member, said dielectric member being positioned adjacent to said stator member; said one surface of said rotor member including a cut out portion acting as a rotor electrode for alteration of electrostatic capacity upon rotation of said rotor member through variation of confronting areas between said rotor member and said stator electrode; said dielectric member being a plate member of dielectric ceramic material separately formed and disposed between said rotor member and said stator electrode; a contact member including a rotor terminal end and a rotor terminal lead which form a single monolithic element, said contact member being positioned adjacent said rotor member and being adapted to urge said rotor member towards said dielectric member and said stator member; said stator member, stator electrode, dielectric member, rotor member and contact member being housed in a substantially cylindrical casing of electrically insulating plastic material except for said stator terminal end and said rotor terminal end, said substantially cylindrical casing being firmly affixed to said stator member and including a through opening in a top thereof; said substantially cylindrical casing being closed at a bottom thereof by an electrically insulating plastic base which includes openings therethrough to accommodate said stator terminal end and said rotor terminal end; and said rotor member being adapted to be rotated by inserting an adjusting means through said through opening in the top of said casing to engage a groove in the rotor member which includes a marking for identification of directional property.
Claim 2
Dependent Claim
315 words
A variable capacitor for use in electrical and electronic equipment comprising: a substantially circular disc-like stator member of electrically insulating plastic material to which a stator electrode is secured thereto, said stator electrode including a stator terminal end and a stator terminal lead which form a single monolithic element; a rotor member of electrically conductive material including one surface which mates with and is rotatably disposed on a dielectric member, said dielectric member being positioned adjacent to said stator member; said one surface of said rotor member including a cut out portion acting as a rotor electrode for alteration of electrostatic capacity upon rotation of said rotor member through variation of confronting areas between said rotor member and said stator electrode; said dielectric member being a plate member of dielectric ceramic material separately formed and disposed between said rotor member and said stator electrode; a contact member including a rotor terminal end and a rotor terminal lead which form a single monolithic element, said contact member being positioned adjacent said rotor member and being adapted to urge said rotor member towards said dielectric member and said stator member; said stator member, stator electrode, dielectric member, rotor member and contact member being housed in a substantially cylindrical casing of electrically insulating plastic material except for said stator terminal end and said rotor terminal end, said substantially cylindrical casing being firmly affixed to said stator member and including a through opening in a top thereof; said substantially cylindrical casing being closed at a bottom thereof by an electrically insulating plastic base which includes openings therethrough to accommodate said stator terminal end and said rotor terminal end; and said rotor member being adapted to be rotated by inserting an adjusting means through said through opening in the top of said casing to engage a groove in the rotor member which includes a marking for identification of directional property.
Claim 3
Dependent Claim
28 words
A variable capacitor as claimed in claim 1, wherein said substantially cylindrical casing is provided with a flat portion having a predetermined area on a peripheral surface thereof.
Claim 4
Dependent Claim
39 words
A variable capacitor as claimed in claim 1, wherein said substantially cylindrical casing is further provided with adjusting means comprising a plug member associated with said rotor member for rotating said rotor member through rotation of said plug member.
Claim 5
Dependent Claim
28 words
A variable capacitor as claimed in claim 1, wherein said stator member is disposed on said separate base of electrically insulating material which forms part of said casing.
Claim 6
Dependent Claim
47 words
A variable capacitor as claimed in claim 1, wherein said stator member is provided with an opening, on one surface thereof, which mates with a corresponding projection formed on said stator electrode of said stator terminal lead for positioning of said stator electrode on said stator member.
Claim 7
Dependent Claim
27 words
A variable capacitor as claimed in claim 1, wherein said dielectric member is a coating of dielectric material applied to said one surface of said rotor member.
Claim 8
Dependent Claim
17 words
A variable capacitor is claimed in claim 1, wherein said dielectric member is of polyethylene fluoride resin.
Claim 9
Dependent Claim
17 words
A variable capacitor as claimed in claim 1, wherein said rotor member is produced by press work.
Claim 10
Dependent Claim
16 words
A variable capacitor as claimed in claim 1, wherein said rotor member is produced by casting.
Claim 11
Dependent Claim
16 words
A variable capacitor as claimed in claim 1, wherein said rotor member is produced by forging.
Claim 12
Dependent Claim
24 words
A variable capacitor as claimed in claim 1, wherein said contact member is a plate spring member integrally formed with said rotor terminal end.
Claim 13
Dependent Claim
29 words
A variable capacitor as claimed in claim 1, wherein said contact member is further provided with a spring washer member disposed between said contact member and said rotor member.
Claim 14
Dependent Claim
44 words
A variable capacitor as claimed in claim 1, wherein said stator member is integrally formed with a base member of electrically insulating material which forms part of said substantially cylindrical casing and wherein said electrode is secured to said stator member by one-piece molding.
References Cited (Backward Citations)
GB937395A
Cited
FR521900A
Cited
US1533611A
Cited
US2475144A
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US2654060A
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US3287613A
Cited
US3304472A
Cited
US3486089A
Cited
US3500147A
Cited
US3603850A
Cited
US3656033A
Cited
DE2011884A1
Cited
US3953771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |