Solid state television tuner with voltage variable capacitors

Claim 2

A solid state television tuner comprising selector means, means providing a plurality of channel selection settings individually selectable through actuation of said selector means, a wide band signal selecting circuit having tunable resonant circuit means including a solid state voltage variable capacitance selectively controllable in accordance with the level of applied voltage, a variable voltage source responsive to the selector means for providing a predetermined distinctive level of applied voltage for each channel selection setting, said voltage source including linearly voltage dividing tap means at each channel selection setting and connectable to apply voltage to said voltage variable capacitance when said selector means is actuated to the corresponding channel selection setting, and preset tuning means adjustable for independently controlling the voltage dividing action of only the particular voltage dividing tap means that is connected to said variable voltage capacitance for effecting fine tuning, said voltage source including circuit means providing first and second resistive path regions having different voltage gradient profiles, first and second contactors respectively engageable with said first and second resistive path regions to determine a voltage range between said contactors and movable in ganged relation along said resistive path regions to vary said voltage range, and an output potentiometer conneCted between said contactors having an adjustable output tap to provide a linear variation in output voltage within the voltage range determined by said contactors, said output tap constituting at least one of said voltage dividing tap means.

Claim 3

A solid state television tuner comprising selector means, means providing a plurality of channel selection settings individually selectable through actuation of said selector means, a wide band signal selecting circuit having tunable resonant circuit means including a solid state voltage variable capacitance selectively controllable in accordance with the level of applied voltage, a variable voltage source responsive to the selector means for providing a predetermined distinctive level of applied voltage for each channel selection setting, said voltage source including linearly voltage dividing tap means at each channel selection setting and connectable to apply voltage to said voltage variable capacitance when said selector means is actuated to the corresponding channel selection setting, and preset tuning means adjustable for independently controlling the voltage dividing action of only the particular voltage dividing tap means that is connected to said variable voltage capacitance for effecting fine tuning, said voltage source comprising means rotatable about a central axis and providing a plurality of resistive paths annularly spaced about said axis and extending parallel thereto, there being one of said paths for each of said channel selection settings, and circuit means for producing a voltage gradient lengthwise of said paths, said voltage dividing tap means comprising separate contactor means for each of said paths, each of said contractor means slidably engaging the corresponding one of said paths for lengthwise movement there-along, said selector means including means for indexing the rotatable means to individually electrically connect any one of said contactor means with said signal selecting circuit.

Claim 4

A solid state television tuner comprising selector means, means providing a plurality of channel selection settings individually selectable through actuation of said selector means, a wide band signal selecting circuit having tunable resonant circuit means including a solid state voltage variable capacitance selectively controllable in accordance with the level of applied voltage, a variable voltage source responsive to the selector means for providing a predetermined distinctive level of applied voltage for each channel selection setting, said voltage source including linearly voltage dividing tap means at each channel selection setting and connectable to apply voltage to said voltage variable capacitance when said selector means is actuated to the corresponding channel selection setting, and preset tuning means adjustable for independently controlling the voltage dividing action of only the particular voltage dividing tap means that is connected to said variable voltage capacitance for effecting fine tuning, said voltage source comprising means rotatable about a central axis and providing a plurality of resistive paths annularly spaced about said axis and extending parallel thereto, there being one of said paths for each of said channel selection settings, and circuit means for producing a voltage gradient lengthwise of said paths, said voltage dividing tap means comprising separate contactor means for each of said paths, each of said contractor means slidably engaging the corresponding one of said paths for lengthwise movement there-along, said selector means including means for indexing the rotatable means to individually electrically connect any one of said contactor means with said signal selecting circuit.