JPS5994349A - X-ray tube of strap anode - Google Patents

Abstract

PURPOSE:To secure an X-ray tube that generates a surface-formed X-ray focusing by means of X-rays paralleled with each other, by installing a specific strap anode and a pair of deflecting coils in the X-ray tube respectively. CONSTITUTION:A pair of deflecting coils 14 are disposed by facing each other with a tube's flat two surfaces between at the outside of a tube 11, using a part a little to a hot cathode 12 located between a strap anode 13 and the hot cathode 12. When the specified high voltage is impressed in space between the strap anode 13 and the hot cathode 12, an accelerated electron flow (e) emitted out of the hot cathode 12 is deflected by the deflecting coil 14 and distributively collides with an interspace between both end parts of a target 13a of the strap anode 13 whereby a surface-formed X-ray focusing 21 by X-rays paralleled with each other is emitted out of the target 13a. The X-rays comprising this X-ray focusing 21 is generated at a point inside a metal nearby the electron flow collision point of the target 13a and radiated from a surface opposite to the target in the direction of the electron flow after transmitting the metal's thickness of the target 13a.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to xl tubes.

[Technical background of the invention and its problems]

FIG. 1 shows an example of a conventional X-ray tube. The electron flow accelerated by the high voltage applied between the anode (2) and the cathode (4) having the filament (3) is the target of the anode (2).
(2a) and emits X5(1). The X-rays obtained in this manner are treated as a point ray source because the target focus is minimal.

Therefore, in industrial X-ray transmission inspection equipment that needs to transmit rod-shaped or band-shaped objects, it is often necessary to use a long rod-shaped X-shaped detector and scan the X-shaped tube's own tooth. . In the former method, X-rays emitted from a point source with a divergence angle pass through the object to be measured obliquely, so angle correction must be performed in order to obtain accurate cross-sectional information. Furthermore, the latter method has disadvantages in that mechanical scanning causes deterioration of the X-ray tube and is accompanied by noise.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to solve the above problems in industrial X-ray transmission inspection equipment, the present invention aims to provide a strip-shaped anode X-ray tube that generates a planar X-ray flux of parallel X-rays. .

[Summary of the invention]

The present invention provides a tube having a substantially isosceles triangular planar shape, a hot cathode disposed within the isosceles apex portion of the tube and emitting an obstructive flow in a direction perpendicular to the bottom surface of the tube; a strip anode disposed parallel to the bottom surface of the tube and having an elongated target in the longitudinal direction of the bottom surface; a pair of deflection coils for deflecting current emitted from the hot cathode so as to distribute the current between both ends of the target of the strip anode and collide with the target; We have achieved the intended purpose by realizing a band-shaped anode X-ray tube that is characterized by generating a planar X-ray flux of mutually parallel X-rays from the band-shaped anode target when a high voltage is applied.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows a strip-shaped anode X-ray tube according to an embodiment of the present invention. Second
In the figure, aυ is a tube, which is formed of silicon glass, for example, into a flat box shape with a substantially isosceles triangular planar shape, and whose interior is evacuated.

α2) is a hot cathode with a filament, which is placed within the isosceles apex region of tube I, and the bottom surface of tube ←υ (
lla) emits an electron flow in a direction perpendicular to (131 is a band-shaped anode, which is arranged parallel to the bottom surface (11a) at a portion near the bottom surface (lla) of the tube aυ.
) It is formed in a thin strip shape having a long and narrow tagera) (13a) in the longitudinal direction. (14) is a deflection coil,
A pair is placed on the outside of the tube αD with the two flat surfaces of the tube in between, taking the hot cathode area between the band-shaped anode 03) and the hot cathode a2, and the hot cathode a2 emitted from the hot cathode σ. In an anode X-ray tube, the electron flow (e) is transferred between both ends of the target (13a) of the strip anode a~, and when a predetermined high voltage is applied between the strip anode (i3) and the hot cathode αa, the hot cathode ( 12
The electron current (e) emitted from + and accelerated is deflected by the deflection coil α→ and is distributed between both ends of the target (13a) of the strip anode (I (6)) and collides with the target (13a).
From (13a), as shown in the figure, a planar X-ray flux (2υ is emitted) due to mutually parallel X-rays, and an X-ray flux (21)
The X-rays that make up the target are generated at a point inside the metal close to the electron flow collision point (13a), and are transmitted in the direction of the electron flow through the thickness of the metal (13a) to the opposite side of the target. Indicates the side surface. In the X-ray tube of this modification, the target layer (23a) of the band-shaped anode (23) is
) with respect to the approach direction (formed by multiple barrier flows)
The structure differs from that in FIG. 2 in that the inclined surface is formed into a rod shape facing the heavy particle flow (e), but otherwise the structure is the same. The electron flow (e) deflected by the deflection coil a collides with the 45° inclined surface of the target layer (23a), and as shown in the figure, X-rays are generated parallel to each other in a direction perpendicular to the direction of entry of the electron flow (e). A planar X-ray flux (31) is emitted.

〔Effect of the invention〕

As detailed above, according to the present invention, the electron current emitted from the hot cathode is deflected by the deflection coil so as to distribute and collide with the target of the strip anode having the elongated target. A planar X-ray flux of mutually parallel X-rays can be generated from the band-shaped anode target.

Therefore, if an X-ray tube is used in an industrial XG transmission inspection device, □
Because the ray beam passes through the object at right angles, there is no need for angle correction, and there is no need to mechanically inspect the X-ray tube, compared to using a conventional point-source X-ray tube. As a result, it is possible to obtain advantages such as simplifying the configuration of the device, improving reliability, and reducing costs.

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing a conventional X-ray tube, and Figure 2 is a diagram showing the structure of a conventional X-ray tube.
FIG. 3 is a configuration diagram showing an X-ray tube according to an embodiment. FIG. 3 is a configuration diagram showing an X-ray tube according to a modification of the present invention. 11...Tube lla...-Bottom surface of tube 12...Hot cathode 13...Striped anode 1
3a...Target 14...Deflection coil 2
]...X-ray flux 23...Striped anode 23a
...Target 31...X-ray flux agent Patent attorney Inoue -Male

Claims (1)

[Claims] A tube whose planar shape is an isosceles triangle; a hot cathode disposed within the apex of the isosceles of this tube and which emits an electron flow in a direction perpendicular to the bottom surface of the tube; a strip anode arranged parallel to the bottom surface of the tube and having an elongated target in the longitudinal direction of the bottom surface; and a strip anode arranged outside the tube with a hot cathode distance between the strip anode and the hot cathode. a pair of deflection coils for deflecting electrons emitted from the target so as to distribute and collide between both ends of the target of the strip anode; A band-shaped anode X-ray tube characterized in that when a voltage is applied, a planar X-ray flux of mutually parallel X-rays is generated from a target of the band-shaped anode.