US1042109A

US1042109A - X-ray tube.

Info

Publication number: US1042109A
Application number: US70905812A
Authority: US
Inventors: Henry Green
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-07-12
Filing date: 1912-07-12
Publication date: 1912-10-22
Anticipated expiration: 1929-10-22

Description

H. GREEN.

X-RAY TUBE.

APPLICATION FILED J'ULY'IZ, 1912.

1,042,109, Patented 0011.22, 1912.

WITNESSES f IINVENTOR Henry Green ATTORNEY UNITED sTA'rns PATENT cru se,

HENRY GREEN,1OF HARTFORD, CONNECTIGUTp X-RAY' TUBE.

Application filed July 12,1912. Seria11o.'709.,058.

To all whom it may concern:

Be it known that I, HENRY GREEN, a citizen of the United States, residing at Hart ford, county of Hartford, and State of Connecticut, have invented certain new'and use-. ful Improvements 1n X-Ray Tubes, of which the following is a specification.

'The object'of this invention is to produce a device. of the oharacter'described having features of novelty and advantage.

Fi re 1 of the drawings shows a tube embodying my invention. Fig. 2 shows a modification.

'Referring to the drawings, a denotes an- X-ray tube of'usual form having the central bulbous portion 00 and the oppositely arranged tubular extensions b-c to receive the usual anode (Z and cathode e.

f denotes a conventional form of regulator by means of which the vacuum of the tube may be reduced when desired.

As thus far described the tube is of usual and well known construction.

My invention resides inproviding an additional electrode 10 of tubular form the inner end of which is located in operative relation with the anode and preferably at a short distance therefrom and at the rear thereof, this electrode extending intoan extension .11 for a substantial distanc'e. A wire of conducting material 12 attached to the outer end of this electrode is sealed through the end of the extension 11 to provide an exterior terminal which is illustrated as connected with the anode terminal by. the conducting wire 14, though in some cases it may be desirable to omit this connection.

In the form in which I have practised this invention a considerable portion of the length of the electrode 10 is confined within the tubular extension 11. As a result of this construction a tube, having a vacuum which is relatively low in comparison with tubes as now made, gives a penetration of the higher vacuum tubes of the old type and the clear definition of the lower vacuum tubes, enabling the operator to make rapid pictures .of soft tissuesand bone structures on the same plate, at considerable depth,

' withclear definition and at a short exposure;

Specification of Letters mat.

Patented Oct. 22,1912. I

quired for the cathode stream is interposed between the cathode and anode, and when using heavy currents this gas interferes with the'=passing of the cathode stream, blunting the focus to some extent and reducing the penetration.

In the operation of a tubemade in accordance with my invention, particularly during the pumping stage, a phenomena ap pears which indicates that the excess of 'gas in the tube over that required for the passage of the cathode stream is drawn up into this tubular electrode and there held, removing it from the path of the cathode stream. I am aware that this third elecindicated in Fig. 1, might be formed by a closely coiled wire as illustrated at 15 in Fig. 2 and possibly in other ways. But the essential feature is that it shall be of tubular form whether its cross section be round, square or anything between, and of sufficient length that its inner end shall be in operative relation with the anode and its outer end projected into an extension from the glass bulb.

I claim as my invention:

. 1.,The combination with an X-ray tube including the usual cathode and anode elec *trode instead of having a solid wall, as

trodes, of a third electrode oftubular form located within the tube with one end in relative operative proximity to said anode.

2. The combination with an X-ray tube trodes, of a third electrode of tubular form supported within thetube with one end arranged in operative relation with the anode, the other end projecting into a tubular extension of the tube.

' including the usual cathode and anode elec- 3.'The combination with an X-ray tube said third electrode being. electrically conincluding the usual cathode and anode ele cnected with the terminal exterior of the trodes, of a tubular extension from the wall tube. v of said X-ray tube, and a'third electrode HENRY GREEN. 5 of tubular form having one end located Witnesses: 1 within said tubular extension and its other I E. ONEILL,

end in operative relation with said anode, M. A. -SHUoKERow.