JPH0332850B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a rotating anode Regarding wire tubes.

(Prior Art) As a method for supporting a rotating anode that rotates at high speed in a high vacuum, a method is known in which a rotor is fixed to the rotating anode by magnetic force instead of a mechanical bearing. The conventional anode current introducing device for this rotor has a contact pin (contact member) at the center of the axis of the rotor, and a flat plate with a spring facing this contact pin is fixed directly to the case.
When the contact pin and the flat plate are brought into contact with each other during radiation irradiation, there is a large difference in relative speed, which causes severe wear between the contact pin and the flat plate, posing a problem in terms of service life.

(Problems to be Solved by the Invention) As described above, in the conventional rotating anode X-ray tube, the contact pins and the flat plate were severely worn, which caused problems in terms of life span.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a rotating anode X-ray tube that can avoid wear of the anode current introducing portion and is more reliable than the conventional one.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a rotating anode X-ray tube in which a rotor having a rotating anode is supported and rotated by magnetic force in a non-contact manner. A rolling bearing constituting a part of the current introduction path, a contact member rotatably held by the rolling bearing, and elastically supporting the contact member in the direction of the rotor to prevent the contact member and the rotation. an anode current introduction device having a spring that enables point contact with the child;
The present invention is characterized in that the contact member and the rotor are brought into point contact with each other so that the contact member and the rotor are rotated at approximately the same circumferential speed.

(Function) By using the present invention configured as described above, the contact member of the rotating anode X-ray tube is rotationally supported and elastically supported, so excellent effects such as improved wear resistance of the contact member and rotor can be achieved. play.

(Example) Hereinafter, typical examples of the present invention will be described using the drawings.

FIG. 1 shows one embodiment of the anode current introducing device for a rotating anode X-ray tube according to the present invention.

The rotating anode X-ray tube 1 shown in FIG. 1 has a case 1a made of a non-magnetic and insulating material, for example glass.
The inside of this case 1a is maintained at a high vacuum. Conductive support rod 3a, insulating cover 5
A rotating anode 3 fixed to a rotor 4 configured by a rotor 4 is placed opposite the cathode 2.
The case 1a is formed to cover the above-mentioned rotating anode 3, cathode 2, and rotor 4. This rotor 4 is supported in a completely non-contact manner by a magnetic force supply source 6 and a control device (not shown).

Mechanical bearings 7a and 7b are provided on the inner wall of the case 1a at locations corresponding to the support rods. These mechanical bearings 7a, 7b are not used when the rotor 4 is supported in a non-contact manner, but are used to hold the rotor 4 in a non-destructive state when it is not rotating or in an emergency.

FIG. 2 is an enlarged view of the anode current introducing device.
The symbols in the figure are the same as in FIG. 1. The anode current introducing device 8 is a rolling bearing 8 which is a type of mechanical bearing.
A contact pin (contact member) 9 is fixed to the inner ring of the rolling bearing 8b, a spring 10 is installed in the axial direction of the outer ring of the rolling bearing 8b, and the rotor 4 shown in FIG. 1 is moved in the axial direction to provide support. The rod 3a is brought into contact with the contact pin 9. This support rod 3a and contact pin 9
is compressed by the restoring force of the spring 10 installed in the axial direction. This action causes the support rod 3
a and the contact pin 9 rotate at approximately the same circumferential speed, and the anode current is introduced into the rotating anode 3 from the outside by the conductive wire 11 via the support rod 3a, the contact pin 9, and the rolling bearings 8a, 8b. Ru. The introduction path 13 of this anode current is indicated by an arrow in the figure.

Note that the contact pin 9 can also be fixed to the support rod 3a side. At that time, a flat plate may be installed on the inner ring of the rolling bearing 8a. In this case, the flat plate functions as a contact member.

FIG. 3 shows another embodiment of the invention. Components that are the same as those in FIG. 1 are designated by the same reference numerals and detailed explanations will be omitted. In this embodiment, a member composed of a contact pin 9 and rolling bearings 8a and 8b is smoothly supported in the axial direction, and a rolling bearing 12, which serves as a path for anode current, is installed outside of the above member. . In addition, rolling bearings 8a, 8
A single rolling bearing having the functions of both the rolling bearing 12 and the rolling bearing 12 may be installed. In the anode current introducing device 8 configured in this way, the anode current introduced from the conductive wire 11 is transferred to the anode current introducing device 13.
It flows through the rolling bearing 12 which has rolling elements compressed between the inner ring and outer ring as shown in FIG. Therefore, since there is no rolling bearing 12, the anode current can be passed through the conductive wire 1 more reliably than the method shown in FIG.
It can be installed from 1.

FIG. 4 shows another embodiment of the invention. As with FIG. 3, detailed explanations of the same parts as in FIG. 1 will be omitted.

In this embodiment, an anode current introducing device 8 is provided in the inner ring of the mechanical bearing 7b on the side closer to the lower end of the support rod 3b among the mechanical bearings 7a and 7b for holding the rotor 4 in a non-destructive state in an emergency. .

In this way, the anode current introducing device 8 having the structure in which the mechanical bearing 7b is arranged so as to pass through the support rod 3b has a structure in which the mechanical bearing 7b is also used as the mechanical bearing of the anode current introducing device 8, thereby impairing wear resistance. This has the advantage of reducing the number of parts and saving space.

[Effects of the Invention] As described above, the rotating anode X-ray tube of the present invention provides excellent effects such as improved wear resistance of the contact pin and rotor of the anode current introducing device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotating anode X-ray tube according to the present invention, and FIG. 2 is an enlarged sectional view of an anode current introducing device.
3 and 4 are enlarged sectional views showing a modification of the anode current introducing device for a rotating anode X-ray tube according to the present invention. 1... Rotating anode X-ray tube, 1a... Case, 2...
...Cathode, 3...Rotating anode, 3a...Support rod, 4...
...Rotor, 5...Lid (insulating material), 6...Magnetic force supply source, 7a, 7b...Emergency mechanical bearing, 8a,
8b... Rolling bearing (mechanical bearing for equipment), 8...
Anode current introducing device, 9... Contact pin (contact member), 10... Spring, 11... Conductive wire, 12...
Rolling bearing (mechanical bearing that supports smoothly in the axial direction), 13... Anode current introduction path.

Claims (1)

[Scope of Claims] 1. In a rotating anode X-ray tube in which a rotor having a rotating anode facing a cathode is supported and rotated in a non-contact manner by magnetic force, a part of the current introduction path to the rotating anode is provided. A rolling bearing comprising: a contact member rotatably held by the rolling bearing; and point contact between the contact member and the rotor by elastically supporting the contact member in the direction of the rotor. an anode current introduction device having a spring, and configured to rotate the contact member and the rotor at approximately the same circumferential speed by bringing the contact member and the rotor into point contact. A rotating anode X-ray tube characterized by: 2. The contact member is configured to be in contact with the rotor when an anode current is introduced, and out of contact with the rotor when an anode current is not introduced. rotating anode X-ray tube. 3. The rotating anode X-ray tube according to claim 1, wherein the spring elastically supports the contact member via the rolling bearing. 4. The rotating anode X-ray tube according to claim 1, wherein the spring elastically supports the rolling bearing and the contact member. 5. The rotating anode X-ray tube according to claim 1, wherein the rotation center of the rolling bearing and the rotation center of the rotor are concentric. 6. The rotating anode X-ray tube according to claim 1, wherein the rolling bearing is provided at a position through which the rotor is inserted.