JPS59191248A - rotating anode x-ray tube - Google Patents

Abstract

PURPOSE:To increase the degree of free design while facilitating the adjustment of balance, improving the accuracy of balance and furthermore not being prevented from thermal radiation by using a spring washer having asymmetrical shape in respect to a passing hole of a rotary axis for fixing a graphite target to the rotary axis in order to adjust the unbalance of the rotary anode. CONSTITUTION:A graphite target 2 is fixed to a rotary axis 4 by using a spring washer 1 having asymmetrical shape in respect to a rotary axis passing hole for adjusting the unbalance of the rotary anode. For instance, several kinds of asymmetrical washers having different lengths of L, different angles of theta and the different shapes tip of are prepared, the rotary anode is put on a balance testing machine, one of several kinds of spring washers is selected according to the amount of said unbalance for adjusting its mounting position according to the direction of said unbalance. When the adjustment of unbalance is finished, the top of a nut 3 is caulked for not being loosened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotating anode X-ray tube which allows adjustment of unbalance by very simple means.

[Background of the invention]

In conventional rotating anode X-ray tubes with targets made of tungsten, molybdenum, etc., it was possible to reduce the unbalance of the rotating anode by 3 q% by cutting the target. However, when using a graphite target, due to material problems, when it is shaved, internal distortion may occur and cracks may occur. For this reason, Japanese Utility Model Application Publication No. 56-35754 discloses that an unbalance correction plate provided with a dam on the 8 faces of the graphite target of the rotating anode is used to adjust the translation.

However, in this case, the unbalance adjustment plate covers the target (J%k), which prevents heat radiation from the back surface of the target, causing another problem of increasing the temperature of the target. Some of the effects used will be lost.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotating V4 pole x-ray tube using a graphite target that does not have the above-mentioned problems.

Summary of the Invention] In order to achieve the above object, the present invention uses a spring washer having an asymmetrical shape with respect to the rotating shaft passage hole,
A graphite target was fixed to a rotating shaft, and 14 rotations of rotating anodes were made without making noise.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in more detail using the drawings. 1st
The figures show a state in which a rotating R pole according to an embodiment of the present invention is attached to a target, in which (a) is a plan view and (b) is a front view. In the figure, 1 is a spring washer having an asymmetrical shape with respect to the rotary shaft passage hole, which is the gist of the present invention, 2 is a graphite target, 3 is a nut, 4 is a rotary shaft, and 5 is a rotor. Further, FIG. 2 is an enlarged view of the asymmetric spring washer 1 according to the present invention,
(a) is a plane IML; (b) is a front view. Several types of asymmetrical spring washers 1 with different lengths L1 angles θ and tip shapes are made in advance, and the rotating anode is placed on a balance test machine. Select one and adjust its mounting position according to the direction of hand balance. After adjusting the unbalance RIt, caulk the upper part of the nut to prevent it from loosening. The mounting position of this asymmetrical spring washer is on the target surface as shown in FIG.

[Effects of the Invention] As explained above, according to the present invention, it becomes easy to balance a rotating anode using a graphite target, and the alignment accuracy improves. Since heat radiation is not obstructed, the degree of freedom in designing the rotating anode is increased.

[Brief explanation of drawings]

FIG. 1(a) is a plan view showing a rotary anode according to an embodiment of the present invention in a target mounted state, FIG. 1(b) is a front view thereof, and FIG.
Figure (a) is an enlarged plan view of the asymmetric spring washer according to the present invention,
(b) is an enlarged front view thereof. I: Asymmetric spring washer, 2: Graphite target, 3: Nut, 4: Rotating shaft, 5:
...Rotor. (0L) (b) Mouth===go===ko

Claims (1)

[Claims] In a rotating anode X-ray tube using a graphite target, the graphite target is fixed to the rotating shaft using a spring washer that has an asymmetric shape with respect to the rotating shaft passage hole, and the rotation @ pole hand balance is adjusted. A rotating anode X-ray tube characterized by: