GB145084A - Process and apparatus for the production of rontgen rays - Google Patents

Abstract

145,084. Lilienfeld, J. E. April 9, 1918, [Convention date]. R÷ntgen-ray tubes.-In a high-vacuum tube, a field oscillating with a high frequency controls the'cathode-ray discharge either in the part of the tube between an incandescent filament and a cathode, or in the part of the tube in which the discharge is accelerated between the cathode and an anticathode, so that sudden variations of the density of the cathode-ray discharge, in phase with the oscillations, are produced. As shown in Fig .1, the filament G is heated by current from a transformer H, and oscillations between the filament and a cathode K are produced by means of a transformer T<z>, the secondary of which is in series with an oscillatory circuit, comprising a condenser C<1> and an inductance J' coupled with an inductance J<2>, which is connected through a condenser C<2> with a grid N and the filament. An alternating potential is applied between the cathode K and the anticathode by means of a transformer T<R> or a continuous or unidirectional potential may be used. In the arrangement shown in Fig. 2, the cathode-ray discharge pass ing through an opening in the cathode K to the anticathode and through an aperture in an interposed screen B, is deflected by means of an oscillating potential applied to two plates P<1>, P<2>, thereby causing the discharge to impinge on the screen, the resulting charge on which is absorbed in a resistance (not shown), or in a part W of the winding of the transformer T<R>. A continuous, alternating or unidirectional potential is applied between the screen and the anticathode. The plates P<1>, P<2> are connected with an oscillating circuit comprising condensers C<1>, C<2> and inductance J<2> which is connected at the point S with the screen B and with the transformer T<R>. The arrangement may be such that the discharge passes through the screen when the potential between the plates is zero, or a predetermined value. The plates P<1>, P<2> may be dispensed with, in which case the screen B and the anticathode are connected with a high frequency oscillation circuit. Specifications 23169/12, 14892/13 and 4097/15 are referred to. According to the Specification as open to inspection under Sect. 91 (3) (a) the frequency of the oscillations exceeds 125 periods a second, and variations in the velocity of the discharge are produced. In the arrangement shown in Fig. 1 (Cancelled), the condenser C<1> and inductance J<1> are connected in series. This subject-matter does not appear in the Specification as accepted.