US1028969A

US1028969A - X-ray tube.

Info

Publication number: US1028969A
Application number: US27942305A
Authority: US
Inventors: Joseph Rosenthal
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-09-21
Filing date: 1905-09-21
Publication date: 1912-06-11
Anticipated expiration: 1929-06-11

Description

J. ROSENTHAL.

' X-RAY TUBE.

APPLICATION FILED SEPT. 21, 1906.

1,028,969. Patented Ju ne 11,1912.

UNITED AT PA NTo FIoE.

I JOSEPH ROSEN THAL, 0F MUNICH, GERMANY.

x naY TUBE.

Specification of Letters Patent. Patented J n ne 11, 1912,.

Application filed September 21, 1905. Serial No. 279,423.

To all whom it may concern:

Be it known that I, Josnrn ROSENTHAL, engineer, citizen of Germany, residing at Munich, Bavaria, Germany, have invented certain new and useful Improvements in X-Ray Tubes; and I do hereby declare the following to be a full, clear, and exact description of the invention, suchas will en-v able others skilled in the art to whichit ap pertains to make and use the same.

This invention comprises improvements in or relating to Rontgen-ray tubes.

It is known that the Rontgen-rays emitted by ordinary Rontgen-tubes are not homogeneous, and that they comprise rays which vary to.a very great extent in penetrative power. 1

The object of the present invention is to provide a Rtintgen-t'ube by means of which mixtures of Riintgen-rays, in which rays of high penetrative power predominate, are obtained. For this purpose-a screen may be arranged inside the tube, about the anticathode, consisting of material which is penetrated by the rays of higher penetrative power, but by which the rays of lower penetrative power are absorbed, said material being, for instance, sheet-iron, porcelain, or the like.

The drawing shows a section of one form of a Rontgen-tube embodying my invention.

Referring to the drawings, a is the cathode, b the anti-cathode, and 0 a,cylindrical screen, for example, of sheet-iron, mounted on and surrounding said anti-cathode.

It will benoted that the rays emanating from the. anti-cathode are directed against the walls of the cylindrical screen, whereby the rays of lower penetrative power are ab sorbed, while those of higher penetrative power pass outward, thus giving a more nearly homogeneous radiation,

Having thus fully described my invention, what I claim is 1. ha Rontgen apparatus, the combina-v tion, with the Rontgen tube, the cathode and the anticathode, of means arranged within said tube to permit the rays to pass directly from the cathode to the anticathode but to prevent the emanation of rays direct from the anticathode against the walls of the tube.

2. In a Rontgen apparatus, the combination, with the Rontgen tube,the cathode and the anti-cathode, of a screen arranged with-- in said tube and surrounding the anticathode to permit the rays to pass directly .from the cathode to the anticathode but to intercept all rays emanating directly there-- from. v 1

I 3. In a Rontgen apparatus, the combination, with the tube, the cathode and the anticathode, of a screen mounted on the anticathode and surrounding the same to permit the rays to pass directly from the cathode to the anticathode but to intercept" the rays emanating from the anti-cathode.

4. In a Rontgen apparatus, the combination, with the tube,-the cathode, and the anticathode, of a cylindrical casing surrounding the anticathode and having an open end directed toward ,the cathode, the casing permitting the rays from the cathode to pass through its open end directly to the anticathode but acting to filter the rays emanating directly from the anticathode.

5. An X-ray tube having a massive target of material substantially impervious to X- rays and provided with a deep recess to receive the cathode stream entering said target, a cathode mounted in said tube to cooperate with said target, said tube being formed of a glass body surrounding said target and cathode, interceptors formed on said target to minimize the discharge of undesirable radiation therefrom and a window substantially transparent to X-rays mounted on said targetthrough which the X-rays pass before striking'the body of said tube.

6. An X-ray tube having a massive target of materialsubstantially lmpervious to X- rays and provided with a deep recess to receive the cathode stream entering said tar get, a cathode mounted within said tube to cooperate with said target, interceptingmeans on said target to intercept undesirable radiation therefrom and a window substantially transparent to X-rays and impervious to undesirable radiation mounted within saidtube in the path of the useful X-rays before they strike the body of said tube.

7. An X-ray tube having a target, a cathode mounted within said tube to cooperate with said target, intercepting means mounted within said tube to intercept undesirable radiation from said target, and a window substantially transparent to X-rays mounted within said tube in the path of the useful 1:)