# US 4,399,551 A · X-Ray tube having rotatable transversely oscillatory anode

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- Number: US 4,399,551 A
- Document ID: US4399551A
- Status: Granted
- Kind: A
- Application number: 06/191,936
- Filed: 1980-09-29
- Granted: 1983-08-16
- Earliest claimed: 1980-09-29
- Inventors: John K. Grady
- Web page: https://patentgrep.com/patent/US4399551A

## CPC

- H01J 35/10: Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
- H01J 35/24: Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

An X-ray tube including a chamber enclosing an anode disc rotatable about an axis, and movable transversely with respect to that axis, the tube also enclosing an electron beam source for projecting electrons along a beam directed towards a planar surface of the anode disc. The beam source is disposed so as to direct its beam at an acute angle of incidence to the planar surface of the anode disc and produce X-rays which are thereupon reflected from the anode disc through a window in the chamber.

## Claims

### Claim 1

An X-ray tube comprising:
a chamber enclosing an electron beam source including a cathode for projecting electrons along a beam axis and a window in said envelope through which X-rays may emerge;
an anode-disc rotatable about a shaft, said disc having a planar surface normal to said axis of rotation, said beam source being disposed so as to direct said electron beam at an angle of incidence to said normal surface to produce an X-ray which is transmitted through said window; and
means to impart transverse movement to said disc during rotation thereof including support means engaging respective ends of the shaft, guide means slidingly receiving at least one support means and holding the shaft at a fixed angle to the electron beam axis, and means imparting translatory movement to the shaft, thereby to minimize the quantity of electron beams striking any given path on said disc in any particular time interval.

### Claim 2 (depends on 1)

An X-ray tube as recited in claim 1, wherein said shaft has a first end thereof cooperatively disposed within an end cap, said enc cap having bias means linking the end cap and shaft for imparting said transverse motion to said shaft and said anode-disc, said shaft having a second end cooperatively disposed within a disc bearing in rotatable transversely movable relationship therewith.

### Claim 3 (depends on 2)

An X-ray tube as recited in claim 2, wherein said end cap receives a bearing therein, said bearing being disposed in an elongated channel to permit transverse movement of said bearing therein.

### Claim 4 (depends on 3)

An X-ray tube as recited in claim 3, wherein said bias means is in communication with said bearing, activation of said bias means causing transverse movement of said bearing and said shaft in said bearing in a controlled manner.

### Claim 5 (depends on 3)

An X-ray tube as recited in claim 3, wherein said end cap has pressure applying means in communication with said bearing, and is in opposition to said bias means, to effectuate return motion of said bearing in said elongated channel upon de-energization of said bias means.

### Claim 6 (depends on 3)

An X-ray tube as recited in claim 3, wherein said end cap has a guide plate disposed about said shaft and against said end cap, said guide plate having an elongated slot therein, said elongated slot having a long axis which is in alignment with the long axis of said elongated channel.

### Claim 7 (depends on 5)

An X-ray tube as recited in claim 5, wherein said disc bearing receiving said second end of said shaft has a groove therein, said groove being in alignment with said long axis of said elongated slot in said guide plate and said long axis of said elongated channel in said end cap.