JP2010060442A - Radiation detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray image detector 11 capable of enhancing productivity. <P>SOLUTION: The X-ray image detector 11 includes an X-ray detection element 12 detecting X-rays, a case 14 storing the X-ray detection element 12, and a resin sheet 16 sealing a gap 15 between the X-ray detection element 12 and the case 14. An integral containing the X-ray detection element 12, case 14, and resin sheet 16 is covered with a protective body 17. The resin sheet 16 is softened by heating and stuck to the surface of the X-ray detection element 12 and the surface of the case 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a radiation detector for detecting radiation.

  In dental clinics or dental clinics, dental X-ray image detectors are used as radiation detectors for X-ray imaging of teeth and the like (for example, see Patent Document 1).

  In this X-ray image detector, the X-ray detection element is housed and protected in a case, and the gap between the X-ray detection element and the case is sealed and protected from moisture.

Conventionally, in order to seal the gap between the X-ray detection element and the case, it has been common to fill the gap with a resin filler such as an epoxy resin or a silicon resin and cure it.
Japanese Patent Laid-Open No. 2002-219126 (second page, FIG. 1-2)

  However, in the conventional X-ray image detector, a resin filler such as epoxy resin or silicon resin is filled to seal the gap between the X-ray detection element and the case. The curing time after filling takes about 30 minutes to 1 day, and it takes time to handle the resin filler, resulting in poor productivity.

  This invention is made | formed in view of such a point, and it aims at providing the radiation detector which can improve productivity.

  The present invention relates to a radiation detection element that detects radiation, a case that houses the radiation detection element, a resin sheet that seals a gap between the radiation detection element and the case, and the radiation detection element, case, and resin And a protector that covers the entire sheet including the sheet.

  According to the present invention, since the gap between the radiation detection element and the case is sealed with the resin sheet, productivity can be improved as compared with the case where a resin filler such as epoxy resin or silicon resin is used.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of the radiation detector, and FIG. 2 is a plan view of a state in which a resin sheet is disposed along the radiation detection element and the case of the radiation detector.

  In FIG. 1, reference numeral 11 denotes an X-ray image detector as a radiation detector. This X-ray image detector 11 is, for example, for dentistry, and detects X-rays as a radiation detection element for detecting an X-ray irradiation image of a tooth, etc. An element 12, a cable 13 connected to the X-ray detection element 12, a case 14 for housing the X-ray detection element 12, a resin sheet 16 for sealing a gap 15 between the X-ray detection element 12 and the case 14, and A protector 17 is provided to draw only the cable 13 to the outside and cover the entire cable 13.

  The X-ray detection element 12 includes a photoelectric conversion substrate 21 that is a sensor unit, and a scintillator unit 22 formed on the photoelectric conversion substrate 21. The scintillator unit 22 converts an incident X-ray image into an optical image and transmits it to the photoelectric conversion substrate 21. The photoelectric conversion substrate 21 is provided with an image sensor composed of a CCD, a CMOS, or the like, and converts the optical image converted by the scintillator unit 22 into an electrical signal.

  The cable 13 connects the X-ray detection element 12 and an external device, and inputs / outputs electric signals to / from the X-ray detection element 12.

  The case 14 has a substrate portion 25 and an edge portion 26 that protrudes from the peripheral edge portion of the substrate portion 25 to the one surface side, and is formed in a box shape that opens to the one surface side. The case 14 accommodates the X-ray detection element 12 with the scintillator portion 22 of the X-ray detection element 12 facing the inside of the case 14 so as to face the substrate portion 25. There is a gap 15 between the outer peripheral portion of the photoelectric conversion substrate 21 of the X-ray detection element 12 and the inner peripheral portion of the edge portion 26 of the case 14.

  The resin sheet 16 is formed of a thin sheet such as polyethylene, for example, and the shape of the resin sheet 16 is such that at least a gap 15 between the X-ray detection element 12 and the case 14 is formed as shown in FIG. In order to cover and seal, it may be formed in a rectangular frame shape that matches the shape of the gap 15 between the X-ray detection element 12 and the case 14. However, it must be formed in a size that can be attached to the X-ray detection element 12 and the case 14 across the gap 15.

  The resin sheet 16 is heated at 80 to several tens of degrees Celsius and softened while being weighted on the surface of the photoelectric conversion substrate 21 of the X-ray detection element 12 and the surface (outer peripheral surface) of the edge of the case 14. It can be affixed to the surface of the photoelectric conversion substrate 21 of the X-ray detection element 12 and the surface (outer peripheral surface) of the edge portion of the case 14 in the absence of a crack.

  Since the time required for attaching the resin sheet 16 is until the resin sheet 16 is softened and attached, it is within 5 minutes, and the productivity per day can be improved.

  Since it is a thin resin sheet 16, it can be easily formed into parts, and the troublesome handling such as application and defoaming can be eliminated like conventional resin fillers such as epoxy resin and silicon resin.

  Since the thin resin sheet 16 is soft and rich in moisture resistance, the sealing stability by absorbing the thermal expansion difference between the X-ray detection element 12 and the case 14, and the X-ray detection element 12 after sealing, Reliability can be improved.

  The protector 17 is a resin material, and is formed by molding so that only the cable 13 is pulled out and the X-ray detection element 12 and the case 14 are covered and fixed. In molding, the molten resin is injected into a mold in which the X-ray detection element 12 and the case 14 are disposed, but the molten resin injected into the mold is instantaneously cooled by contact with the mold or the like. Therefore, the resin sheet 16 is not affected.

  The X-ray image detector 11 configured in this manner uses a resin filler such as epoxy resin or silicon resin to seal the gap 15 between the X-ray detection element 12 and the case 14 with the resin sheet 16. Compared to the case, the manufacturing time can be shortened, the resin sheet 16 can be handled easily, and the productivity can be improved.

  In addition to dental use, the X-ray image detector 11 can be applied to medical use for patient diagnosis and treatment, industrial use such as non-destructive inspection, and scientific research such as structural analysis.

It is sectional drawing of the radiation detector which shows one embodiment of this invention. It is a top view of the state which has arrange | positioned the resin sheet along the radiation detection element and case of a radiation detector same as the above.

Explanation of symbols

11 X-ray image detector as a radiation detector
12 X-ray detectors as radiation detectors
14 cases
15 Clearance
16 Resin sheet
17 Protective body
21 Photoelectric conversion board
22 Scintillator section

Claims (3)

A radiation detection element for detecting radiation;
A case for housing the radiation detection element;
A resin sheet for sealing a gap between the radiation detection element and the case;
A radiation detector comprising: a protective body covering the whole including the radiation detection element, the case, and the resin sheet. The radiation detection element includes a scintillator section that converts radiation into light and a photoelectric conversion substrate that converts light converted by the scintillator section into an electrical signal, and the scintillator section is housed in the case with the scintillator section facing the inside of the case,
The radiation detector according to claim 1, wherein the resin sheet seals between the photoelectric conversion substrate of the radiation detection element and the case. The radiation detector according to claim 1, wherein the resin sheet is attached to the surface of the radiation detection element and the surface of the case by softening by heating.

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