.~ With variable inductor and capacitor structure in common {2}
67
.~.~ Butterfly-type tuner
DEFINITION
Classification: 334/67
(under subclass 66) Subject matter wherein the tuner includes a tuning unit having a variable capacitor type configuration with the self inductance of the mechanical structure of the capacitor and the capacitance of the capacitor forming a tuned circuit, the rotational displacement of the rotor of the variable capacitor simultaneously varying both the capacitance and the inductance of the unit.
(1) Note. Butterfly tuners generally consists of a pair of capacitor stators of generally quadrantal shape, a complete annular band surrounding and supporting the stators and forming parallel inductive paths between the capacitor stators, and a rotor having elements in capacitative relation to the stator and in inductive relation to the band and movable to vary both the capacitance and the inductance of the unit.
(2) Note. Semibutterfly and coaxial butterfly tuners are properly classified in this subclass.
SEE OR SEARCH CLASS
331, Oscillators,
95, for oscillators having a butterfly resonator circuit.
