US1679894A - X-ray tube - Google Patents

Description

G. BUCKY X-RAY TUBE Aug. 7, 1928.

Original Filed Sept. 22, 1925 INl/ENTOR 64152711451100 BY a Md WITNESS 6 A NOR/ms Ell lib

ill 5 till lt atented drug. 7, 1928.

STATES teaser GUSTAV HUSKY, ()1? NE? YORK, 15!. Y.

Sit-BAY llZUIBlZl.

Application filed fieptember flit, 1925, Eerial No. 57,820. Renewed January 14;, W28.

lift is well-known that ordinary glass op poses a substantial. resistance to the passage oi? i-rays. so that only relatively hard rays will become available er-ztoriorly oil? the tube in which the l t-rays are produced, unless provision is made For inscrti o; a window 'ot a material which ollers loss resistance to the passage ol I i-rays than ordinary glass. For this purpose, so-called liindemann glass has been used with considerable success. llhis material, however, has the drawback that so for only comparatively small windows oi? it could be fitted into an lit-ray tube, such. windows being at most slightly less than one inch srpiare. This reduces the area of the pencil ol? Ill-rays emitted through the window. As it is highly desirable in many cases to obtain a more powerful emission of Ka'ays, l have devised a way ierniitting windows or: liindeniann glass or similar ma terial to be made of considerably larger size than hitherto. According to my present invention, the window is constructed with a reinforcing skeleton of platiuunr wire or equivalent support. The preferred way ol making the window consists 1n first placing the wire net in the opening ol the tube, then anchoring the edges of the window to the glass wall by melting the latter to embed the outer portions of the net therein, and finally applying the liindemann glass to the wire support, so that the meshes of the net will be filled by the lhindcrnann glass. I am thus enabled. to make tlie liindcinann glass windows as large as desired, and to obtain a radiation lield of much greater area than has been possible hitherto. It is true that theoretically the shadow east by the wires will cut down slightly the emission of IQ rays, but this is practically negligible, since the apparent loss is more than compensated. by the very substantial increase in the size oi the radiation field.

ll satislactory and preferred embodiment of my invention is illustrated by the accompanying drawings, in which Fl 1 is an elevation of an X-ray tube having a window constructed according to my invention, and Fig. 2 is a cross section on line 2-2 of Fig. 1.

In the body ot' the evacuated bulb are located the cathode 11 and theantieathode 12, of any well-known or approved construction Said body has an opening in the edge 13 of which is embedded the marginal portion of a wire netting l l made of platinum or other suitable metal. This wire netting has its meshes tilled by a mass or pane 15 ot Lindemann or similar material permeable even to relatively soft lei-rays, and preferably the wire netting lies entirely within the liindelnann glass, that :is, no part of the netting is exposed either on the outside of the tube or on the inside thereof. llltrong windows of practic: lly any size dcsircd may be constructed after this fashion in the wall of Lil-ray tubes.

[is mentioned hereinabove, the preferred way of applying the improved window consists in first placing the wire not in the opening of the tube while the edges o'l the opening are softened by heat, thus causing the marginal portion of the netting Ll to become embedded and anchored in the edge 13 oil the opening. Then the lhindemann glass is applied in a molten or at least viseid condition so that it will adhere both to the netting 14: and to the edge 13 ot the opening, thus sealing the latter and forming the plate or pane l5. -While this pane has been shown plane, I desire it to be understood that this it not essential, and that various modifications may be made without departing from the nature of my invention as defined in the claims.

I claim:

1. An Xaay tube having a body with an opening, a wire netting, the marginal por tion of which is anchored in said opening, and a pane of material readily pervious to X-rays, supported on said netting and lused to the edge oi said opening.

2. An Iii-ray tube having a body with an opening, an apertured support, the marginal portion. oil which is anchored in said opening, and a pane of material readily pervious to I'd-rays, carried by said support and sealing said opening.

3. An X-ray tube having a body with an opening, an apertured support, the marginal portion of which is anchored in said 0pcning, and a pane of material. readily pervious to X-rays, carried by said support and sealing said opening, said support being e1nbedded in its entirety within the edge of the body opening and within the said pane.

In. testimony whereof I hereunto set my hand.

GUSTAV BUGKY.

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