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United States Patent | 4,555,808 |
Fujimoto | November 26, 1985 |
A television tuner comprises a voltage controlled variable capacitance diode provided in common to the UHF band, the VHF high band and the VHF low band. A tuning voltage provided from a channel selecting apparatus is applied to the variable capacitance diode as a control voltage. A relation between the tuning voltage and the receiving frequencies is selected such that the tuning voltage of the high end channel (the maximum receivable frequency) of the UHF band is higher than the tuning voltages of the respective high end channels of the remaining bands and the tuning voltage of the low end channel (the minimum receivable frequency) of the VHF low band is lower than the tuning voltage of the respective low end channels of the remaining bands. The channel selecting apparatus is adapted to restrict the upper and lower limits of the tuning voltage, whereby the upper limit of the receivable frequency of the UHF band is restricted and the lower limit of the receivable frequency of the VHF low band is restricted.
Inventors: | Fujimoto; Isao (Katano, JP) |
Assignee: |
Sanyo Electric Co., Ltd.
(Osaka,
JP)
|
Appl. No.: | 06/446,356 |
Filed: | December 2, 1982 |
Application Number | Filing Date | Patent Number | Issue Date | ||
185138 | Sep., 1980 | ||||
Sep 14, 1979 [JP] | 55-118597 | |||
Jan 19, 1980 [JP] | 56-4961 | |||
Current U.S. Class: | 455/180.4 ; 334/15; 455/189.1; 455/190.1; 455/191.2 |
Current International Class: | H03J 5/24 (20060101); H03J 3/00 (20060101); H03J 3/18 (20060101); H03J 5/00 (20060101); H03J 003/24 (); H04B 001/06 () |
Field of Search: | 334/11,14,15 358/191.1 455/179,180,185,187,188,191,190 |
3983490 | September 1976 | Ma |
4005256 | January 1977 | Arumugham |
4081771 | March 1978 | Hendrickson |
4138653 | February 1979 | Midgley |
4145659 | March 1979 | Wolfram |
4249256 | March 1981 | Molinari et al. |
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