US1839208A

US1839208A - Quartz oscillator for controlling transmitter valves and oscillation generators

Info

Publication number: US1839208A
Application number: US263701A
Authority: US
Inventors: Eberhard Heinrich
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-03-18
Filing date: 1928-03-22
Publication date: 1932-01-05
Anticipated expiration: 1949-01-05

Description

1,839,208 MITTER VALVES 1932. H. EBERHARD QUARTZ OSCILLATOR FOR CONTROLLING TRANS AND OSCILLATION GENERATORS Filed March 22, 1928 (57 2 wepforr WM m ' low power.

Patented Jan. 5, 1932 UNITED STATES PATEN -OFFIC HEINRICH EBERHARD, or BERLIN-LICHTERFELDE, GERMANY QUARTZ OSCILLATOR FOR CONTROLLING TRANSMITTER VALVES AND OSCILLATION GENERATORS y 1 Application filed March 22,

My invention relates to V piezoelectrical crystals such as quartz which may be used by means of effects of resonance as oscillators for controlling transmitter valves and oscillation generators or as resonators for controlling the frequency of any kind of oscillations.

It is a well known fact that valve transmitters for wireless telegraphy may be controlled by quartz crystals. It has not, however, been possible hitherto with the aid of the quartz directly to control considerable amounts of energy, as are'transmitted by high power valves, therefore using piezoelectrical crystals was limited to comparatively By developing and technically improving the circuits means have alread been formed for directly controlling wit the quartz larger valves too of the order of 100 watt and above. In doing so, it has, however, been discovered that the quartz crystal is subjected to much heating already by the considerable amplitudes and, perhaps, also by dielectric losses. This heating is very disadvantageous to the permanent working of such quartz controlled transmitters. According to my invention such permanent operations may be carried through also with direct controlling of powerful valves by oscillating quartz crystals if special cooling surfaces are used for draining off the heat arising, more particularly, however, also if the quartz is made mechanically large enough in order to allow of such cooling surfaces being efiectively used. In this respect great advantages are derived from the fact that the natural electrical oscillation, which is important for the working of the crystal as an oscillator and as a resonator, depends essentially only upon the dimension in the direction of the electric axis while the directions of the quartz crystal lying at right angles thereto are without any considerable influence upon the frequency of wave length. By

merely increasing the size of the quartz 'crys tal it is therefore possible to use effective cooling surfaces in order to allow of the controlled power being magnified. Appropriately the cooling surfaces are arranged as electrodes for the quartz crystal.

My invention may be best understood with 1928, Serial No.

263,701, andi n Germany March is, 1927.

reference to the accompanying the drawings:

Figure 1 shows a piezoelectrical oscillator device arranged in a glass-vessel, the quartz being seen from such aside that the electrical axis of the quartz is lying in the plane of the drawings.

Figure 2 shows the same device from a direction perpendicularto that of Figure 1, the electrical axis of the quartz being arrange perpendicularly to the plane of the drawings. In Figure 2 the upper part of the glass vessel is broken off.

In the drawings a piezoelectrical crystal 3 is arranged between the

metal plates

1 and 2 which lie in parallel planes plate 1 being supported by standards 7 sealed on the press of the valve. This quartz is shaped in such a way that it forms a thin plate axis of the quartz lying in the direction perpendicular to the planes of the two metalplates and therefore in the direction of the shortest dimension of the crystal. In Figure 2 by means of dotted lines the rectangular shape of the quartz is to be seen. The metal plates 2 and 3 are large enough to provide a good cooling effect for the crystal if it gets hotwhen oscillating. The

electrodes

4 and 5 are connected to the metal-plates 2 and 3 in such a way that they are able to bring up the electrical oscillation to the sides of the crystal. 5 are performed as springs as the figures illustrate, the metal-plates 2 and 3 operating in the device at the same time as electrodes as shown in'the drawings. The whole device is arranged in a glass vessel 6 which is preferably highly evacuated in order to avoid uncontrollable discharges between the electrodes.

However, it may be useful after evacuating the vessel to fill it with a kind of gases such as helium or a combination of helium and neon. Thus, if the great amplitudes of the oscillation arise this will be indicated by lighting effects between the electrodes and the quartz caused by ionizations of said gases.

I claim:

A piezo-electric oscillator for high energy two rectangular of exactly even thickness; the electrical For this purpose the electrodes 4 and I drawings. In t":

slgnature.

HEINRICH EBERHAR-D.

Mmmwmmmuul