US1310714A

US1310714A - X-ray tube

Info

Publication number: US1310714A
Authority: US
Publication date: 1919-07-22
Anticipated expiration: 1936-07-22

Description

T. B. RIDER. X-RAY T UBE.

APPLICATION FILED IAN. I8. I9I8.

' 1,310,714. Patented July 22,1919;

THOMAS B. RIDER, OF LOS ANGELES, CALIFORNIA, ASSIGNOR F ONE-HALF TO ADOLPHE DANZIG-ER, OF Lo ANGELES, CALIFORNIA.

X-RAY TUBE.

Application filed January 18, 1918.

' citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful X-Ray Tube, of which the following is a specification.

This invention relates to X-ray' tubes in .which the electrons travel at high velocity between thecathode and the target formed by the anode.

One object of the invention is to prevent overheating andmelting of the metal on the surface of the target or anode by providing means for changing the focal spot, when the tube is being used with short interruptions for a number of operations.

Another object is to lengthen the life of such targets or anodes by providing separate independent focal spots in the surface of the anode so that a deforming of the surface of one spot cannot influence any of the other spots.

Another object is to provide means of holding the cathode and anode in suitable relationso that a stream of cathode rays can implnge on the surface of the anode.

Other objects will appear from the accompanying drawing as well as from the following description and appended claims.

In the drawing- Figure 1 is a fragmentary longitudinal sectional View of the adjusting means for changing the relation between the cathode and the anode.

Fig. 2 is a fragmentary side elevation of the anode showing the outline of inserted material in the surface of the anode.

Fig. 3 is the front elevation of the anode, several separate insets in the surface of the anode being illustrated in the manner I prefer.

Fig. 4 is a front elevation of a rotating target for the anode/ Fig. 5 is a fragmentary longitudinal section through the anode slightly modified with the rotating target in position.

Similar numbers refer to similar parts throughout the several views.

In Fig. 1, 4t designates the X-ray tube and 5 the extension tube, which are usually made of glass. The stem 6 is fused into the end 7 of the tube 6 projecting practically concentrically into the X-ray tube. The cathode 8 is slidingly and turnably mounted on the stem 7 being provided with an extension 9, forming the housing for the operating mech- Specification of Letters Patent.

Patented July 22, 1919.

Serial No. 212,529.

anism. The cathode with extension being preferably made of aluminum, which can naturally not be influenced by a magnet, I prefer material which can be influenced by a magnet for the operating parts for which a recess 10 is provided in the extension of the cathode. Lugs 11 are provided at a suit able place for the blocks 12 and 13. These blocks are preferably made of steel or other suitable material which can be influenced by a magnet, and being pivotally connected with the lugs, the blocks can naturally be drawn toward the wall of the glass tube 5 by holding ,a magnet on the outside of the glass tube. The

rings

14 and 15 pivotally connected with each other at 16 are disposed on the stem 6 having holes 17 of a size slightly larger than the diameter of the stem so that, when in the position shown, the edges of the material near the holes set or clamp themselves tightly to the stem (3 while in a compressed position, illustrated in dotted'lines at 18, the holes being naturally large enough to easily slip over the stem to any desired position. Bosses '19 are provided on the

rings

14 and 15 at suitable places forming the support for the spring 20.

Holding a magnet to the outside of the extension tube 6 near the blocks 12 and 13, naturally causes a drawing of the blocks, with their free ends 21 sliding along the outer flat surfaces of the rings, toward the edges 22 to the position indicated in dotted lines at 23, bringingthe rings to the compressed position indicated in dotted lines at 18', in which position therings can .freely be moved, slipping over the stem as described above, to be set on the stem in any desired with the extension 9 and with the embodied To allow and assure a fpcusing of the cathode to the center of each of the several insets, the stem 6 is made with a correspondstem, the setting or clamping-of the operatremoved from near the extension tube 5 Causing the releasing'of theblocks thereby '25 It will easily be understood that such remg means to the stem will be possible as.

long as the upper and lower edges in the holes engage with the stem which will be the case with square or oval holes as l as two flat sides are provided in the holes.

. After having the rings contracted or com pressed as described above and set the cath-' ode to a position desired, the magnet is allowing the spring to press the rings back to the engaging position illustrated in Fig. 1.

leasing can be effected to focus the cathode to any of the insets in the surface of the anode, and, if not quite to the center of the insets, the suitably shaped holes '17 will settle on the correspondingly shaped stem 6 to bring the focus from'the cathode to the center of one of the insets.

In the slightly modified construction of theanode illustrated in Figs. L and 5, the inserts 25 are embodied in an extra p'la'te26, which is rotatably mounted on the front of the anode 24, the boss 27 being provided on of the weight'onthe target-plate.

.is desirable to change the position of the the target-plate 27 turnably fitting in a suitable hole or recess inthe anode. This targetplate 26 is also provided-with balancing ball .or weight extensions 28 for changing the position of the target-plate by the gravity lnce it target-plate 26 always a certain distance, that is from one inset to another to bring the focus of the cathode to one of the insets, a tumbler or locking pin 29 is slidingly embodied in the anode being pressed by the spring 30 into one of the notches or recesses 31 in the target-plate 26-. Such notches or recesses- 31 are naturally arranged corresponding to the insets 25 to assure a proper position for the insets in'relation to the focus from the cathode, as will easily be understood.

If desired to change the focus from'the cathode to a new, or from one inset to another inset, the whole X-ray tube is shaken anode.

enough to cause the Weight extension 28 .to

an operation as is required when changing the focus by turning the cathode in the manner described in relation to Fig. 1.

As illustrated in Fig. 1, the focusing face.

of the cathode naturally must be arranged eccentrically to the bore in the cathode, or the center of the focusing face eccentrically to the center of the supporting stem 6, so as g to bring the focus to the different insets when turning scribed above.

Having thus described my invention, I claim: v

1. In an X-ray tube an anode having a suitable number of independentinsets, and a cathode having means for focusing the cathode toward any of the insets in the the cathode on the stem asde- In an X-ray tube, a cathode comprising a body having a concentric bore and having a focusing face transverse to the bore with the center of the. focusing face eccentric to the center of the bore in the body, a stem in the tube forming a support for the cathode; the cathode being turnably and slidably disposed on the stem, and

I clamping members engaging with the bod of the cathode having means to engage wit ,the stem for holding the cathode in focusing position, the clamping members also adapted for moving the cathode on the stem. 3. 'In an X-ray tubean anode havin a suitable number of insets, a cathode havlng means for focusing the same toward any of the insets in the anode, and a stem forming the support for the cathode having a num-v ber of flat surfaces longitudinally to the ste corresponding to the number of the insets in. the anode.

4:. In an/X-ray tube an-anode having a suitable number of insets of suitable material to withstand the stream of cathode rays consisting of electrons traveling at high velocity and having also means for changing the focus of the cathode to any of the insets in the anode.

.In testimony whereof I hereunto affix my signature in the presence of two witnesses.

- THOMAS E. RIDER. Witnesses:

C. M. ENNS, M.- G. FERRAHAN.