US3697904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uhf tuner
Assignee: Panasonic Holdings Corp
•
Filing: 1970-09-08
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Granted: 1972-10-10
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Expires: 1990-09-08
Abstract
Abstract A UHF tuner comprising a main channel switch-over shaft, a fine adjustment sleeve slidably and telescopically overlapping the main switch-over and not normally coupled to a fine adjustment mechanism, and a fine adjustment drum accommodated in a housing and slidably mounted on the main switch-over shaft, the fine adjustment drum being provided with a plurality of fine adjustment screws adjacent to the periphery thereof, wherein the rotation of the main switch-over shaft causes the rotation of the fine adjustment drum at a reduced speed through a gear arrangement including a sun gear integrally provided on the main switch-over shaft, planet gears rotatably carried by the fine adjustment drum and an internal gear of the housing. When the fine adjustment sleeve is axially moved, it is coupled with the fine adjustment mechanism through one of the fine adjustment screws and a coupling member associated with said fine adjustment mechanism, thereby enabling fine adjustment by turning the fine adjustment sleeve.
Inventors
- 👤 Etsuzo Mohri
- 👤 Toshio Hayakawa
- 👤 Akira Nishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:50
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/02; H03J5/04; H03J5/10; H03J1/00; H03J1/06; H03J1/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
224 words
A UHF tuner comprising a main switch-over shaft coupled with a rotor shaft of a variable capacitor for selecting a desired channel through a gear mechanism, a fine adjustment drum slidably mounted on said main switch-over shaft and integrally providing a plurality of fine adjustment screws adjacent to the periphery of said main switch-over shaft, a fine adjustment sleeve slidably mounted on said main switch-over shaft, a fine adjustment mechanism integrally mounted on a gear of said fine adjustment screws for moving said fine adjustment sleeve in the axial direction and transmitting the rotation of said fine adjustment sleeve to said fine adjustment screws, a capacitor for fine adjustment of said UHF tuner providing a rod opposite to one of said fine adjustment screws supported by said fine adjustment drum and the capacitance of which being varied by said rod, a spring for pushing said rod in the direction of said fine adjustment screw, a reduced speed mechanism for reducing the speed of said fine adjustment drum in order that the connection of said rod with one of said fine adjustment screws may be maintained against the amount of selecting rotation of at least two channels of said variable capacitor varied by said main switch-over shaft, a desired channel being selected by the combined capacitance of said variable capacitor and said pistoncylinder type capacitor.
Claim 2
Dependent Claim
224 words
A UHF tuner comprising a main switch-over shaft coupled with a rotor shaft of a variable capacitor for selecting a desired channel through a gear mechanism, a fine adjustment drum slidably mounted on said main switch-over shaft and integrally providing a plurality of fine adjustment screws adjacent to the periphery of said main switch-over shaft, a fine adjustment sleeve slidably mounted on said main switch-over shaft, a fine adjustment mechanism integrally mounted on a gear of said fine adjustment screws for moving said fine adjustment sleeve in the axial direction and transmitting the rotation of said fine adjustment sleeve to said fine adjustment screws, a capacitor for fine adjustment of said UHF tuner providing a rod opposite to one of said fine adjustment screws supported by said fine adjustment drum and the capacitance of which being varied by said rod, a spring for pushing said rod in the direction of said fine adjustment screw, a reduced speed mechanism for reducing the speed of said fine adjustment drum in order that the connection of said rod with one of said fine adjustment screws may be maintained against the amount of selecting rotation of at least two channels of said variable capacitor varied by said main switch-over shaft, a desired channel being selected by the combined capacitance of said variable capacitor and said pistoncylinder type capacitor.
Claim 3
Dependent Claim
102 words
A UHF tuner according to claim 1, wherein said reduced speed mechanism includes first gear means to cause the rotation of said fine adjustment drum at a reduced rotational speed with the rotation of said main switch-over shaft, said first gear means including a gear integrally provided on said main switching shaft, gears rotatably carried by said fine adjustment drum and an internal gear of a housing, the axial movement of said fine adjustment sleeve being coupled by said fine adjustment mechanism through one of said fine adjustment screws and said rod to enable fine adjustment by turning said fine adjustment sleeve.
Claim 4
Dependent Claim
54 words
A UHF tuner according to claim 1 wherein said main switch-over shaft is coupled to said rotor shaft of said variable capacitor for selecting a desired channel through a second gear means, and said rotor shaft is provided with an integral cam disc formed with peripheral indentations, against which is urged a stopper member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |