JPS59215646A - Rotary anode x-ray tube - Google Patents

Abstract

PURPOSE:To lengthen the service life of bearing, while to provide sufficient strength to the target supporting shaft by employing a non-metallic bearing having temperature withstandability at the side near to the target while a conductive metallic bearing to the side remote from the target. CONSTITUTION:In the bearings for supporting a rotary anode rotatably, the one 9 near to the target 1 is made of temperature withstandable non-metal such as ceramic while the other 5 remote from the target 1 is made of conductive metal. The target supporting shaft 8 is solid having sufficient strength. Consequently the service life of bearing near to the target is lengthened while sufficient strength is provided to the target supporting shaft resulting in lengthening of service life of the rotary anode X-ray tube.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a rotating anode X-ray tube with a long rotating life.

[Background of the invention] Diagram m1 is a conventional rotating anode] [This is a diagram showing the vicinity of the anode on the line, where ■ is the target laser I, which is hit by an electron beam and emits X-rays, and 2 is the target that generates a driving rotational force. Target support shaft that connects the rotor, 3 is the rotor, 4 is the bearing near the target, 5 is the bearing far from the target, 6
is a rotating shaft that is supported by a fixed part through a bearing, and 7 is a fixed part. Conventionally, all metal bearings have been used for the bearings of rotating anode X-ray tubes. Target 1, which is exposed to the impact of
The temperature is limited to about 50°C, and therefore the target support shaft 2 (currently ilj + tl with good heat resistance).

! In order to suppress heat conduction from the target roller 11 to the bearings, especially the bearing 4 on the side closer to the target roller 1-, the cross-sectional cylinder is limited to provide sufficient strength. Bearing No. 1 in the example has a problem in that it ends up becoming hot and tends to have a short lifespan.

[Purpose of the invention]

The object of the present invention is to provide a rotary anode Xi5 tube with a long bearing life, sufficient slackness of the supporting shaft, and a long life.

[Summary of the invention]

In order to achieve the above objective, in this [θ] light, we use non-metallic bearings (e.g. ceramic bearings) that can easily handle high temperatures, as well as non-metallic bearings (e.g. ceramic bearings) that are close to the target and do not become hot. We decided to use a conductive metal bearing as the bearing on the side where the temperature rise is relatively small.

[Embodiments of the invention]

FIG. 2 shows an embodiment of the present invention, where 8 is a target support shaft that is not hollow, thick and has sufficient strength, 9 is a ceramic bearing that can withstand high temperatures, and other symbols are the same as those in FIG. 1. The same is true. As a result of doing this, Targetera l
-The strength of the support shaft is increased, which improves the strength and rigidity of the rotating anode as a whole, extending the life of the bearing.Furthermore, due to the constraint of avoiding high temperatures of the bearing near the target, the conventional Kuget support shaft There was also a supine position where the strength was likely to be insufficient, such as near the joint between the rotor and the rotor, but this is no longer the case.

[Effects of the Invention] As explained above, according to the present invention, the life of the bearing near the target is extended, and the target support shaft has sufficient strength, thereby extending the life of the rotating anode X-ray tube. did it.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an anode of a conventional rotating anode X-ray tube. FIG. 2 is a sectional view of an anode according to an embodiment of the present invention. 1--target, 3-rotor, 5-bearing on the side far from the target throat, 6-rotating shaft, 7-fixing part, 8-thick target support shaft, 9-non-metallic bearing that can withstand high temperatures (ceramic bearing) . Agent Patent Attorney Akio Takahashi

Claims (1)

[Claims] Among the bearings that rotatably support the rotating anode of the rotary excavation X-ray tube, the one closest to the target is a non-metallic bearing that can withstand high temperatures, and the one farthest from the target is a conductive metal bearing. A rotating anode X-ray tube characterized by using.