JPH08241685A - Cathode structure of x-ray tube device - Google Patents

Abstract

PURPOSE: To provide a cathode structure of X-ray tube device formed by spot welding, with which the assembly can be performed using a low-cost facility and being free from coil contacting with a focusing element. CONSTITUTION: Each anchor 2 has a groove 2a furnished in the coil leg mounting surface in the perpendicular arrangement to the coil longitudinal direction, and to mount a filament coil part 1 to anchor part 2, the leg 1b of the coil is inserted in a groove 2a, when distortion caused by deformation due to spot welding will be generated in the longitudinal direction of the coil, and not in the direction of a focusing element stretching perpendicularly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode structure of an X-ray tube device formed by a filament coil portion, an anchor portion and a focusing body, and more particularly, a filament which can prevent the filament coil portion and the focusing body from contacting each other. The present invention relates to a cathode structure of an X-ray tube device having an assembly of a coil part and an anchor part.

[0002]

2. Description of the Related Art Conventional filament coil parts and anchor parts have been attached by Japanese Utility Model Publication No. 32-15525 and Japanese Patent Application Laid-Open No. 62-295327.
As shown in FIG. 3 and FIG. 4 of the publication, the groove of the anchor portion is provided in parallel with the lengthwise direction of the coil for welding stop. In addition, as in Japanese Utility Model Publication No. 49-1577, when the anchor part is drilled, the leg part is inserted into this hole, and it is caulked lightly, the mounting heat is deformed so that internal thermal distortion does not occur. It was intended to prevent deformation. Since this is one in which the leg portion is inserted and crimped, it is possible to sufficiently secure the attachment accuracy of the filament coil portion and the anchor portion. Further, there is a method of using a YAG laser as a non-contact welding method in which the welded portion of the filament coil portion and the anchor portion is less likely to be deformed. By the way, there is resistance welding (spot welding) as an inexpensive welding method which is likely to be deformed.

[0003]

In the case where the groove of the anchor portion is provided in parallel with the mounting direction of the coil of the above-mentioned prior art and the welding is stopped, it is easy to adjust the mounting of the leg portion and the anchor, and the length of the coil is increased. Although it is possible to match the dimensions in the directions, there is a problem in that the deformation of the anchor portion due to welding and the twisting or deformation of the coil of the filament coil portion are not taken into consideration. That is, when such deformation is large, a small focus is required in the X-ray tube device, and therefore the distance between the filament coil unit and the focusing body is very small.
There is a possibility that they may come into contact with each other, and if they come into contact with each other, the desired X-ray cannot be obtained. Also, if you make holes in the anchor, insert the legs of the filament coil into this hole, and lightly crimp and attach,
Since a hole having the same diameter as that of a normal filament wire (φ0.1 to 0.3 mm) is formed, expensive equipment such as laser processing and electric discharge processing is required, and there is a problem that the manufacturing cost becomes high. Further, the non-contact YAG welding also requires expensive equipment, which raises a problem of high manufacturing cost.

The present invention has been made in view of the above problems, and an object thereof is a cathode of an X-ray tube device formed by spot welding which can assemble a coil and a focusing body without contact with each other with inexpensive equipment. It provides the structure.

[0005]

The above object is to provide a filament coil portion provided with a coil around which a filament element wire is wound and leg portions provided at both ends of the coil, and to fix and support the leg portion, and to attach the coil to the coil. 1 which is a terminal to be energized
In a cathode structure of an X-ray tube device comprising a pair of anchor parts, a filament coil part for directing thermionic emission generated from an energized coil, and a focusing body sandwiching the anchor parts, the anchor parts are attached to the leg parts. A groove is provided on the surface in a direction perpendicular to the longitudinal direction of the coil, and the filament coil portion and the anchor portion are attached by inserting the leg portion into the groove and performing spot welding. To be done.

[0006]

According to the above means, the groove is provided on the mounting surface of the leg portion of the anchor portion in a direction perpendicular to the lengthwise direction of the coil, the leg portion is inserted into the groove, and spot welding is performed. Since the filament coil portion and the anchor portion are attached, distortion of the leg portion or the coil due to deformation of spot welding occurs in the length direction of the coil,
Since it does not occur in the direction with the focusing body, which is a direction perpendicular to the length direction of the coil, the coil and the focusing body can be assembled without contact.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the cathode structure of the X-ray tube device of the present invention will be described with reference to the drawings. 1 is a configuration diagram of a cathode structure of an X-ray tube device of the present invention, FIG. 2 is a side sectional view of attachment of a filament coil portion and an anchor portion of FIG. 1, and FIG. 3 is another embodiment of the anchor portion of FIG. FIG.

First, the structure of the cathode structure of the X-ray tube device of the present invention will be described with reference to the drawings. As shown in FIG. 1, the cathode structure of the X-ray tube device of the present invention includes a coil 1a wound with a filament wire and leg portions 1b provided at both ends of the coil 1a.
And an anchor portion 2 which fixes and supports the leg portion 1b and also serves as a terminal for energizing the coil 1a, and a filament coil portion 1 for directing thermionic emission from the energized coil 1a. And anchor part 2
And a converging body 3 that sandwiches. Further, the structure for attaching the filament coil portion 1 and the anchor portion 2 is as shown in FIG.
As shown in FIG. 2, the anchor portion 2 has a groove 2a provided in the mounting surface of the leg portion 1b in a direction perpendicular to the longitudinal direction of the coil 1a, and the leg portion 1a is inserted into the groove 2a. Two
b) and 2c are assembled together by spot welding.

Next, assembly of the cathode structure of the X-ray tube device of the present invention will be described. As a first step, when assembling the filament coil portion 1 and the anchor portion 2, the leg portion 1 is placed in the groove 2a.
b is inserted and temporarily fixed to the pair of anchor portions 2 so as to be symmetrical, and the pair of anchor pieces 2b and 2c are deformed by spot welding to form the one as shown in FIG. At this time, it should be noted that the deformation of the spot welding is transmitted as strain only in the length direction of the coil 1a.

As a final step, the assembly of the focusing body 3 and that formed in FIG. 2 is formed by incorporating it into the insulated recess 3a of the focusing body 3 as shown in FIG. In the cathode structure of the X-ray tube device thus formed, the X of the spot welding deformation of the anchor 2 is transmitted only in the length direction of the coil 1a, and there is the focusing body 3 perpendicular to the length direction of the coil 1a. Since it is not transmitted in the direction, the coil 1a and the focusing body 3 can be assembled without contact.

Further, as another embodiment, as shown in FIG. 3, the piece 2b on the side where the coil 1a is not attached is thinner than the piece 2c on the side where the coil 1a of the anchor 2 is attached, and spot welding is carried out earlier. It may be deformable.

[0012]

Since the cathode structure of the X-ray tube device of the present invention has the above-mentioned structure, the strain transmitted to the leg portion or the coil portion due to the deformation of the spot welding is caused by the length of the coil. Occurs in the direction, and does not occur in the direction with the focusing body, which is the direction perpendicular to the length direction of the coil, and therefore, there is an effect that the coil and the focusing body can be assembled without contact.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a cathode structure of an X-ray tube device of the present invention.

FIG. 2 is a side sectional view showing the attachment of the filament coil portion and the anchor portion of FIG.

FIG. 3 is a diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1 Filament coil part 1a Coil 1b Leg part 2 Anchor part 3 Focusing body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Shimura 1-1-14 Kanda, Chiyoda-ku, Tokyo Inside Hitachi Medical Co., Ltd.

Claims (1)

[Claims] 1. A filament coil portion comprising a coil of wound filament wire and leg portions provided at both ends of the coil, and a pair of terminals which are terminals for fixing and supporting the leg portion and energizing the coil. An anchor portion, a filament coil portion for directing thermionic emission generated from an energized coil, and a focusing body sandwiching the anchor portion.
In the cathode structure of the wire tube device, the anchor portion has a groove provided in a mounting surface of the leg portion in a direction perpendicular to a longitudinal direction of the coil, and the filament coil portion and the anchor portion are mounted by the above-mentioned method. A cathode structure for an X-ray tube device, characterized in that the leg portion is inserted into a groove and spot welding is performed.