WO1987000294A1

WO1987000294A1 - Ionization box-type x-ray detector and method of fabricating the same

Info

Publication number: WO1987000294A1
Application number: PCT/JP1986/000331
Authority: WO
Inventors: Haruo Kurochi; Makoto Gono
Original assignee: Yokogawa Medical Systems, Ltd.
Priority date: 1985-06-28
Filing date: 1986-06-27
Publication date: 1987-01-15
Also published as: JPS623683A

Abstract

An ionization box-type X-ray detector is free from deterioration of temperature characteristics and of insulation among electrode plates due to an adhesive which adheres a plurality of electrode plates to a pair of insulating support plates. The ionization box-type X-ray detector according to the invention comprises a plurality of electrode plates (2, 3) and a pair of insulating support plates (11) adhered to the plurality of electrode plates with an adhesive (12) that exists only in the joints relative to the end surfaces of the electrode plates.

Description

Specification

Ionization chamber type x-ray detector and method of manufacturing the same

〔Technical field〕

The present invention relates to an ionization chamber type X-ray detector for a computer tomography apparatus and a method for manufacturing the same.

(Background technology)

As is well known, the ionization chamber type X-ray detector of the computed tomography apparatus has the configuration shown in FIG. That is, the X-ray detector includes a plurality of signal electrode plates 2 (hereinafter, referred to as an anode) and a plurality of bias electrode plates 3 (hereinafter, referred to as a force source) in a sealed case 1 in which xenon gas or the like is sealed. And electrode plate alignment bodies 23 alternately arranged in parallel with the direction of incidence of the fan beam X-rays incident from the direction of arrow X. The front surface 4 of the sealed case 1 is made of a material having good X-ray transparency, for example, an aluminum thin film, and serves as an X-ray incident window. The sealed case 1 has an arch shape with the X-ray entrance window 4 inside. The anodes 2 are individually connected to a current detection circuit (not shown), and the cathodes 3 are all connected in common to the output terminal of a DC voltage source (not shown).

The configuration of the electrode plate alignment body 23 in the conventional ionization chamber type X-ray detector is as shown in FIG. FIG. 3 shows the electrode plate array 23 in a cross section along the arch of the X-ray detector. As shown in FIG. 3, the anode 2 and the force sword 3 are provided between two insulator support plates 6 made of, for example, ceramic having grooves 5 provided at predetermined intervals, for example, an epoxy adhesive. Fixed by porting by 7. In this case, the adhesive 7 covers the surface 8 of the insulator support plate 6 between the anode and the force sword, for example, with a thickness of about 1.5 mm.

In such a conventional ionization box type X-zong detector, since a large amount of adhesive 7 covers the surface of the insulator support plate 6, when the ambient temperature rises, the adhesive 7 matures and expands. There was a problem that the anode 2 and the force sword 3 were deflected to change the sensitivity, that is, the temperature characteristics of the sensitivity were poor. In addition, if the adhesive contains impurities or is in a poorly cured state, there is a problem that insulation between the anode and the power source is reduced. [Disclosure of the Invention]

An object of the present invention is to provide an ionization chamber type X-ray detector that does not cause a deterioration in temperature characteristics due to an adhesive and a decrease in insulation between electrode plates.

The ionization chamber type X-ray detector of the present invention can be applied to a plurality of electrode plates by an adhesive (12) existing only at a joint between the plurality of electrode plates (2, 3) and the end surfaces of the electrode plates. It is characterized by comprising a pair of bonded insulator support plates (11).

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electrode plate alignment body in an ionization chamber type X-ray detector according to one embodiment of the present invention, FIG. 2 is a configuration diagram showing an ionization chamber type X-ray detector,

FIG. 3 is a configuration diagram of a conventional example of an electrode plate alignment body.

[Best mode for carrying out the invention]

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram of an electrode plate alignment body 23 in an ionization chamber type X-ray detector according to one embodiment of the present invention, which is shown in a cross-sectional view along an arch of the ionization chamber type X-ray detector. . In FIG. 1, an electrode plate alignment body 23 is a small amount of adhesive applied between both end faces of an anode 2 and a cathode 3 between two insulator support plates 11 having a flat surface. Adhered by Agents 1 and 2. Even if the amount of the adhesive 12 used is small, sufficient adhesive strength can be obtained.

The production of such an electrode plate alignment body 23 is performed, for example, in the following steps. That is, using a jig for aligning electrode plates having a plurality of grooves at predetermined intervals, anodes 2 and cathodes 3 are alternately inserted into the grooves of the jig, and the anode 2 and the force source are inserted. After the anode 2 and the force sword 3 are aligned in this manner, a small amount of epoxy adhesive (for example, about 0.15 Aw thick) is applied to both end surfaces of the anode 2 and the force sword 3 to be joined to the insulator support plate 11. The insulator support plate 11 is joined and integrated, and the jig is removed after the adhesive is cured.

In such an electrode plate array 23, the adhesive 12 interposed between the joints between each electrode plate and the insulator sabot plate 11 is very small, and between the anode 2 and the force source 3. No adhesive is present on the surface 13 of the insulator support plate 11 and the surface of the insulator support plate 11 is exposed. Therefore, the effect of the swelling of the adhesive 12 becomes extremely small, The deflection of each electrode plate can be ignored, and the temperature characteristics are improved. In addition, since the surface 13 between the electrode plates of the insulator support plate 11 is exposed without being covered with the adhesive agent 2, the insulation between the electrode plates is stabilized.

Although the best mode for carrying out the present invention has been described above, various modifications can be made by those having ordinary knowledge in the technical field to which the present invention belongs without departing from the scope of the claims described below. It is easy to do.

Claims

The scope of the claims

1. A sealed case (1) that has an X-ray entrance window and contains gas for electricity inside, and a predetermined space inside the sealed case (1) with the plate surface parallel to the X-ray incidence direction. In an X-ray detector provided with an electrode plate alignment body (23) including a plurality of electrode plates (2, 3) arranged in the following manner, the electrode plate alignment holes (23) are arranged at predetermined intervals in the thickness direction. A plurality of aligned electrode plates (2, 3);

A pair of insulator support plates (11) joined to both end faces of each electrode from both sides in a direction perpendicular to the direction in which the electrode plates are aligned, and an adhesive that exists only at the joint with the end face of each electrode. An ionization chamber type X-ray detector, comprising: a pair of insulator support plates (11) bonded by an agent (12).

2. The electricity box type X-ray detector according to claim 1, wherein the sealed case has an arch shape with the X-ray entrance window inside.

3. An ionization chamber type X according to claim 1, wherein the plurality of electrode plates are arranged at regular intervals.

4. The ionization chamber type X-ray detector according to claim 1, wherein the plurality of electrode plates are alternately arranged signal electrode plates and bias electrode plates.

5. The insulator support plate is a ceramic plate.

6. aligning a plurality of electrode plates at predetermined intervals in the direction of their thickness;

A step of applying a thin adhesive to each of the aligned plurality of electrode plates on both end surfaces in a direction perpendicular to the alignment direction, and

A method of manufacturing an electrode plate alignment body for an ionization chamber type X-ray detector, comprising a step of bonding an insulator support plate to both end surfaces of a plurality of aligned electrode plates to which an adhesive is applied, respectively.