US1735808A - High-frequency oscillation generator - Google Patents

Description

Nov. 12, 1929. A. H. TAYLOR I HIGH FREQUENCY OSCILLATION GENERATOR Filed Dec. 22. 1928 M at an Patented Nov. 12, 1929 UNITED s'rzrras PATENT orrlcr;

ALBERT H. TAYLOR, OF WASHINGTON,DISTBIG T OF COLUMBIA, ASSIGNOR 'IO WIRED RADIO, ING, OF'NEW YORK, N. Y., A CORPORATION OF DELAWARE nrerr-rnnounncv 'oscrrna'rroiv ennnna'ron Application flled necember 22, 1928; Serial No. 327,937.

quency oscillation generators wherein the generator is to produce oscillations of any one of a plurality of frequencies.

An objectof this invention isrto provide means in a high frequency oscillation generator employing piezo electric crystal frequency control, whereby the frequency of the oscillations generated may be readily changed.

Another object of this invention is to pro- -vide means in a piezo electric crystal frequency controlled high frequency oscillation generator whereby the frequency of the osc1llations generated may be readily changed from one predetermined constant value to another without destroying the effect of piezo electric crystal frequency control. A further object of this inventlon is to provide means in a piezo electric crystal.

frequency controlled oscillation generator whereby any one of a plurality of piezo electric crystals maybe readily used to control the frequency of the oscillations generated.

An ancillary object of this invention is to connect a plurality of piezo electric crystals into a circuit arrangement with an electron tube oscillation generator having a plurality of grid electrodes whereby any one' of the piezo electric crystals may be readily used to control the frequency of the oscillations generated.

A further object ofthis invention is to provide a piezo electric frequency controlled high frequency -oscillation generator circuit of large output.

filament and anode of the electron tube. This Other features of this invention will be apselective circuit is tuned to .the frequency of any one of the iezo electric elements whereby the electron tu e oscillation generator generates high frequency oscillations corresponding to the frequency of the piezo electric element selected. r In the drawing, the figure illustrates a circuit arrangement embodying this invention.

Referring to the drawing in detail, the reference character 1 designates a thermionic vacuum tube in which are incorporated the anode 2, grid electrodes 3 and 4 and filament or cathode electrode 5. The thermionic vacuum tube may be of the ordinary two grid type or it may be of the shield grid type; in the latter case, the shield grid electrode corresponds to electrode 3 of the figure. 'Reference character 6 designates the source of supply for the cathode 5. A choke coil 7 is connected to the cntrol electrode 4 and biasing' source of potential 7 The control electrode 3 is connected to one terminal of a choke coil 8. The other terminal of-the coil 8 is connected to a voltage divider l0'which is connected across the source of anode potential 11. The sources of potential? and 11 are connected to the filament 5. A capacity 9 is connected across the source of supply 11 and furnishes a high frequency circuit across the source. An inductance 12 havinga capacity 13 associated therewith'is connected to the anode electrode 2 of the thermionic vacuum tube. Piezo electric elements Q, Q, and Q are connected to the grid electrodes of the thermionic vacuum tube 1. Element Q, is connected between the electrode 3 and the cathode 5; element Q is connected between theelectrode 4 and the cathode; and element Q qis connected to the electrodes 3 and 4. If the three piezo electric elements Q Q and Q each have different fundamental frequencies, oscillations of three dilferent frequencies may be generated by the 0 oscillation generator without substituting diiferent piezo electric elements for those in circuit.

Any one of the elements may be used to control the frequency of oscillation by adjusting the resonant frequency of the circuit l213 to correspond, or approximately cor- ,7 lations generated.

the element. For example, when piezo electric element Q, is to be used as a frequency control the resonant frequency of the circuit 12 13 is adjusted to equal or approximately equal that of Q In a similar manner any one of the elements Q and Q may be employed to control the frequency of the oscil- The oscillation generator embodied in this invention may be employed in an arrangement where it is desired to obtain frequency .controlled oscillations of large amplitude without resorting to the use of power amplifiers. .lVhen the piezo electric elements Q,

Q, and Q are so chosen that they all possess an identical fundamental frequency, oscilla-- tions of large amplitude. are generated since the piezo electric elements all function simultaneously. Greater power output may then be obtained from a piezo electric crystal controlled oscillation generator. Obviously some of the amplifiers usually necessary to increase the amplitude of the oscillations before they, are impressed upon the large capacity power amplifier are eliminated in arrangements employing the oscillation generator of this invention. Greater operating efficiency is thus obtained.

While I have described my invention in one of its preferred embodiments, I desire that it be understood that modifications of this invention may be made and that no limitations upon the invention are intended other than are imposed by the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is as follows 1. A high frequency oscillation generator comprising in combination, a thermionic discharge device having a cathode electrode, a plurality of control electrodes and an anode electrode, input and output circuits connected with said electrodes and separate mechanically vibratile frequency control elements connected to each of 'said control electrodes and to said cathode electrode.

2. A high frequency oscillation generator an inductance and an electrostatic capacity connected to said anode electrode and said cathode electrode, a plurality of piezo electrio crystals, individual piezo electric crystals bein connected between said grid electrodes and etween each of said grid electrodes and said cathode electrode.

4. A high frequency oscillation generator comprising in combmation, a thermionic electron discharge device having a cathode electrode, a plurality of control electrodes and an anode electrode, input and output circuits connected to said electrodes and meohanically vibratile elements associated with said input circuits, individual elements being independentlyconnected between said control electrodes and between said control electrodes and said cathode.

5. In a high frequency oscillation generator the combination of a thermionic electron discharge device having acathode electrode, a plurality of grid electrodes and an anode electrode, an output circuit including an inductance and an electrostatic capacity connected to said" anode electrode and said cathode electrode, a plurality of piezo electric crystals each having a different fundamental frequency, individual piezo electric crystals being connected between said grid electrodes and between each of said grid electrodes and said cathode electrode.

ALBERT H. TAYLOR.

Images