JPS5832344A - X-ray-image intensifier tube - Google Patents

Abstract

PURPOSE:To prevent any alkali contamination by preventing any alkali steam, which is introduced during the formation of a photoelectric screen, from flowing into an image-pickup part by installing a partition wall made of a thin metallic plate, which has electron-transmitting property and secures a vacuum airtightness, between an X-ray-image intensifying part and the image-pickup part. CONSTITUTION:A partition wall 13 made of a thin metallic plate, which has electron-transmitting property and secures a vacuum airtightness, is provided between an X-ray-image intensifying part 1 and an image-pickup part 2. An electron beam 14 discharged from an input screen 4, after being accelerated, is transmitted by the partition wall 13. Here, since the energy of the beam 14 is weakened when transmitted by the wall 13, the beam 14 can have the optimum energy when it bumps against a target 7. Besides, since the parts 1 and 2 are airtightly divided independently by means of the wall 13, alkali steam introduced into the part 1 during the formation of the input screen 4 has no chances of flowing into the part 2, and any alkali contamination is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an X-ray image intensifier device equipped with an imaging device.

Conventionally, there is a system as shown in FIG. 1, which combines an X1m multiplier tube and an imaging tube. In the figure, L is X @ multiplication unit, l is imaging unit), 3 is a vacuum envelope, and 4
is an input surface, 5 is a focusing electrode, 6 is an anode, 1 is a target,
8 is an electron gun, 9 is a focusing coil, and 10 is a deflection yoke.

However, with the conventional X-ray image intensifier device as described above,
The electron energy entering yK is strong, and the alkali 11 vapor introduced when forming the photocathode composing the input surface 4 flows into the imaging section zK, causing alkali contamination.

The present invention eliminates the above-mentioned conventional drawbacks and aims to provide an Xa multiplier device.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. The X-ray image intensifier tube cover of this invention is constructed as shown in FIG.
do. E, the vacuum envelope S includes an input window 3a having an arc-shaped cross section, and a substantially funnel-shaped funnel 3 joined to the input window 3a.
b and this funnel jbK joined bottomed cylindrical hole,
It consists of 3c. An input surface 4 is provided close to the inside of the input window 3a of the vacuum envelope 30, and a focusing electrode 5 is provided along the side wall of the funnel 3b. is provided with an anode 6 and constitutes a so-called Xat multiplier.
A target 1 is arranged on the side near bK. This target 1 converts the electron beam/mother turn into an electric signal/mother turn, and corresponds to the position of the output fluorescent surface of the X@Lin multiplier tube.・SEc pipe tart, CCD tart)
The terminal is grounded through a resistor 1, and the signal is taken out at once through a capacitor 12.
ii Continued. Furthermore, an electron gun a similar to a normal image pickup tube is provided inside the camera. Note that an outside Ka of the neck 3@, a focusing coil 9, and a deflection yoke 10 are attached. The inside and outside of the neck 3c are the so-called imaging section l.
It consists of Further, in the present invention, five partition walls IS are provided at the boundaries between the xm multiplier section J and the imaging section l, and the boundaries between the tb funnel sb and the neck J@. This partition wall 13 is made of a thin metal plate that is electron-transmissive and maintains vacuum tightness, and is installed close to the shutter, tar r, and door to airtightly separate the X-ray image intensifying unit l and the imaging unit 7. It is being In addition, 14 in the figure is an electron beam bundle.

The XMIl multiplier tube device of the present invention is constructed as described and shown in the drawings, and is made of a thin metal plate that has electron transparency and maintains vacuum tightness between the image intensifying section J and the imaging section 2. Since the partition wall 13 is provided, the following excellent effects can be obtained. That is, the electron beam bundle 14 emitted from the input surface 4 and accelerated at, for example, 25 KV passes through the partition wall 13, but at this time, the energy is weakened by 6 to 7 KVK, so that the target f
, ) FK can collide with the most appropriate energy l-. In addition, since the X-ray multiplier section L and the imaging section are separated airtightly and independently by the distance w1s, the alkali vapor introduced when forming the input surface does not flow into the imaging section JK, thereby preventing alkali contamination. Prevented in advance.

As explained above, according to the present invention, it is possible to provide an X@image intensifier device of great industrial value.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional view showing a conventional XII multiplier tube cover;
FIG. 2 is a schematic sectional view showing an X-ray image intensifier device according to an embodiment of the present invention. L...X**multiplying unit, l...imaging unit, 3...vacuum envelope %JI...input window, sb...funnel,
3@... Ne, Ri, 4... Input surface% 5... Focusing, 6
...anode, 1...tarr, g, 8...electron gun, 9
... Focusing coil, 10... Deflection yoke, 13...
Partition wall, 14...electron beam bundle. Applicant's agent Patent attorney Takehiko Suzue 111! ! I
1 Me

Claims (1)

[Claims] An X-ray image intensifier tube device comprising an X-ray multiplier that converts the electron beam and arm turn into an X@large input electron beam and an arm turn, and an imaging section that converts the electron beam and arm turn into an electric signal and turn. . An XM multiplier tube device, characterized in that a partition wall made of a thin metal plate having electron transparency and maintaining vacuum tightness is disposed between the XS multiplier section and the photographing side section.