Tuners – Tuner unit directly responsive to voltage and/or current... – Reactance tuning
Patent
1975-02-13
1976-12-07
Chatmon, Jr., Saxfield
Tuners
Tuner unit directly responsive to voltage and/or current...
Reactance tuning
334 16, 334 86, 325452, 325465, 313501, H03H 512, H03J 306, H03J 504
Patent
active
039965406
ABSTRACT:
An apparatus for indicating a tuned frequency of a tuner of a radio or television receiver, said tuner comprising a tank circuit employing a voltage controlled variable capacitance diode as a circuit element, which diode is supplied in a reverse direction with a scanning control voltage from a solid state potential memory device, which control voltage is set as a result of tuning of said tuner, said indicating apparatus comprising a plurality of light emitting diodes arranged in a line, each illuminating the corresponding frequency indicating region out of a plurality of divided frequency indicating regions of a frequency band to be received by said receiver, said regions being arranged in succession to cover said frequency band, and a corresponding plurality of drivers responsive to said control voltage for energizing the corresponding light emitting diode for illuminating the corresponding frequency region to which said tuned frequency pertains. In a preferred embodiment of the invention, the frequency indicating regions to be covered by the adjacent light emitting diodes are adapted to be overlapped in part at the ends thereof, so that the frequency in the overlapped portion in the region is indicated by said two adjacent light emitting diodes.
REFERENCES:
patent: 3495195 (1970-02-01), Ribour
patent: 3519939 (1970-07-01), Tashima
patent: 3753119 (1973-08-01), Close
patent: 3766474 (1973-10-01), MacDonald
patent: 3795863 (1974-03-01), Umeda et al.
patent: 3846707 (1974-11-01), Sakamoto et al.
patent: 3851254 (1974-11-01), Merrell et al.
patent: 3882400 (1975-05-01), Hamada
Kanou Hisao
Sakauchi Yoshiaki
Tsukamoto Kazuyoshi
Ushijima Kazufumi
Yamada Yasuhiro
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