JP2018115899A - Metal/resin composite structure for x-ray imaging detection device, and x-ray imaging detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable X-ray imaging detection device that is excellent in light weight.SOLUTION: A metal/resin composite structure 1 according to the present invention, which is the metal/resin composite structure for an X-ray imaging detection device, comprises: a metal supporting plate 10 that is composed of at least one kind of an alloy material to be selected from an aluminium alloy and a magnesium alloy; and resin molding body parts (12 and 13) that are composed of an engineering plastic. Further, a surface of the metal supporting plate 10 includes an irregularity area 11 that is formed into an irregularity shape, and the resin molding body parts (12 and 13) are bonded to the irregularity area 11. The engineering plastic constituting the resin molding body parts (12 and 13) intrudes into a concave part of the irregularity shape, and then, the resin molding body parts (12 and 13) include at least one kind of a protrusion member to be selected from a columnar member 12 and a flat-plate member 13, which are provided in the irregularity area 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a metal / resin composite structure for an X-ray image detection apparatus and an X-ray image detection apparatus.

As an X-ray image detection apparatus, a portable X-ray image detection apparatus (hereinafter referred to as “electronic cassette”) in which a flat panel detector (hereinafter also referred to as “FPD”) is incorporated in a flat-shaped portable housing. ) Needs are increasing. The reason for this is that the electronic cassette is easy to bring into a patient room for imaging of subjects who are difficult to move to the imaging room, or is difficult to image with a stationary type (for example, an elbow or knee joint). This is because it can also be used for photographing the extremities.
As a technique related to such an electronic cassette, for example, there are techniques described in Patent Documents 1 and 2.

  Patent Document 1 describes an electronic cassette for radiography that includes a scintillator that converts radiation into light, a radiation image detector, a flat housing, and a transmission plate.

  Patent Document 2 discloses an FPD, a circuit board disposed behind the FPD in the radiation irradiation direction and provided with a circuit for controlling the FPD, a support board that supports the circuit board, the FPD, and the FPD. A circuit board and a housing that accommodates the support substrate, and a spacer that is disposed between the support substrate and the housing to secure an accommodation space for the circuit substrate, and has a low bending strength. An electronic cassette is described that includes the spacers arranged to suppress bending in a direction.

JP2012-141242A JP 2014-20791 A

  The electronic cassette is required to be lightweight and small from the viewpoint of easy portability. Also, when removing the electronic cassette from the imaging table and using it in a bed, etc., an unexpected load may be applied to the cassette depending on the subject's imaging site, so it is necessary to have rigidity to withstand this. Become.

  In order to reduce the weight of the electronic cassette, a method using a carbon panel or a composite sheet obtained by laminating a carbon panel and a metal plate such as aluminum is considered as a metal support plate for a circuit board built in the electronic cassette. However, this method affects the bending strength of the electronic cassette itself based on the bending strength anisotropy of the carbon panel. In order to solve this problem, a method of providing a spacer at a specific position of a housing (back case) provided adjacent to a metal support plate is disclosed (Patent Document 2). However, such a method complicates the manufacture of the electronic cassette.

  The present invention has been made in view of the above circumstances, and provides a portable X-ray image detection apparatus excellent in lightness.

  The present inventors paid attention to a metal support plate for fixing a circuit board constituting an electronic cassette, and have intensively studied a method for reducing the weight. As a result, the above-mentioned problem can be solved by using a metal / resin composite structure obtained by joining a resin molded body part for mounting on a circuit board to a specific lightweight metal plate in which an unevenness forming region is formed. The present invention has been reached.

  That is, according to the present invention, the following metal / resin composite structure for an X-ray image detection apparatus and an X-ray image detection apparatus are provided.

[1]
A metal support plate made of at least one alloy material selected from aluminum alloys and magnesium alloys;
A resin molded part made of engineering plastic;
With
The surface of the metal support plate includes a concavo-convex formation region formed in a concavo-convex shape,
The resin molded body portion is bonded to the concavo-convex forming region, and the engineering plastic constituting the resin molded body portion has entered the concave portion of the concavo-convex shape,
The resin molded body part is a metal / resin composite structure for an X-ray image detection apparatus including at least one type of projecting member selected from a columnar member and a flat plate member erected in the unevenness forming region.
[2]
The metal / resin composite structure for an X-ray image detection apparatus according to [1], wherein the columnar member includes a plurality of columnar members formed to have the same height.
[3]
The metal / resin composite structure for an X-ray image detection apparatus according to the above [1] or [2], wherein the columnar member includes a columnar member in which a female screw and / or a male screw is formed.
[4]
The metal / resin composite structure for an X-ray image detection apparatus according to any one of [1] to [3], wherein a female screw is formed on the flat plate member.
[5]
The metal / resin composite structure for an X-ray image detection device according to any one of the above [1] to [4], wherein an average value of the height difference between the convex and concave portions of the concave and convex shape is 10 nm to 200 μm. .
[6]
[1] The engineering plastic constituting the resin molded body part includes one or more selected from the group consisting of polyphenylene sulfide resin, polyether ether ketone resin, polybutylene terephthalate and polycyclohexylene dimethyl terephthalate. A metal / resin composite structure for an X-ray image detection apparatus according to any one of [5] to [5].
[7]
A flat panel detector that detects radiation images by receiving radiation transmitted through the subject;
The metal / resin according to any one of [1] to [6], wherein the metal support plate is disposed behind the flat panel detector in the radiation irradiation direction so as to be adjacent to the flat panel detector. A composite structure;
A circuit board for controlling the flat panel detector mounted on the resin molding part of the metal / resin composite structure;
A housing for housing the flat panel detector, the metal / resin composite structure, and the circuit board;
An X-ray image detection apparatus comprising:
[8]
The X-ray image detection apparatus according to [7], which is an electronic cassette.

  ADVANTAGE OF THE INVENTION According to this invention, the portable X-ray image detection apparatus excellent in the lightweight property can be provided.

It is the perspective view which showed typically an example of the structure of the metal / resin composite structure of embodiment which concerns on this invention. It is sectional drawing which showed typically an example of the structure of the X-ray image detection apparatus (electronic cassette) produced by incorporating the metal / resin composite structure of embodiment which concerns on this invention. It is the figure which showed an example of the joining structure of the resin molding body part which consists of engineering plastics, and an electronic cassette housing | casing backplate, (a) is an exploded perspective view before joining, (b) is an exploded sectional view before joining (C) is sectional drawing which showed the structure after joining.

Embodiments of the present invention will be described below with reference to the drawings. In all the drawings, similar constituent elements are denoted by common reference numerals, and description thereof is omitted as appropriate. Moreover, the figure is a schematic diagram and does not match the actual dimensional ratio. Unless otherwise specified, “˜” between numbers in the sentence represents the following.
Hereinafter, a metal / resin composite structure and an X-ray image detection apparatus using this as a constituent member will be described.

1. Metal / Resin Composite Structure First, the metal / resin composite structure 1 according to the present embodiment will be described.
FIG. 1 is a perspective view schematically showing an example of the structure of a metal / resin composite structure 1 according to an embodiment of the present invention.
A metal / resin composite structure 1 according to the present embodiment is a metal / resin composite structure for an X-ray image detection apparatus, and is formed of at least one alloy material selected from an aluminum alloy and a magnesium alloy. 10 and a resin molded body portion made of engineering plastics. In FIG. 1, all the protrusions erected on the metal support plate 10 are resin molded body portions. In the following description, the resin molded body portions (12 and 13) will be described as an example. As will be described later, the resin molded body portion bonded to the metal support plate 10 may exist only on one side of the metal support plate 10 or may exist on both sides.
Further, the surface of the metal support plate 10 includes an unevenness forming region 11 formed in an uneven shape, and the resin molded body portions (12 and 13) are bonded to the unevenness forming region 11, and the resin molded body portion ( The engineering plastics constituting 12 and 13) have entered the concave-convex recesses.
The resin molded body portions (12 and 13) include at least one type of protruding member selected from the columnar member 12 and the flat plate member 13 erected in the unevenness forming region 11.

  Such a concavo-convex shape can be formed by various roughening methods described later. Depending on the roughening method, the concavo-convex shape of the concavo-convex formation region is such that the first concavo-convex shape portion having a relatively large scale and the second concavo-convex shape portion having a relatively small scale formed on the surface of the first concavo-convex shape portion. And may be configured by. The uneven shape in the present embodiment is used as a term including an aspect having only the first uneven shape part, an aspect having only the second uneven shape part, and an aspect having both the first uneven shape part and the second uneven shape part. It is done.

  The depth of the concave / convex concave portion, that is, the average value of the height difference between the concave / convex convex portion and the concave portion is not particularly limited, but may be, for example, 10 nm or more and 200 μm or less. The average value of the height difference is largely determined by a metal surface roughening method, and can be, for example, 10 nm to 50 μm in the chemical solution method described later, and 100 μm to 200 μm in the laser processing. In addition, in this embodiment, the average value of the said height difference is synonymous with the 10-point average roughness measured based on JISB601.

  An engineering plastic constituting the resin molded body portion has entered the concave and convex portions. More specifically, for example, it is preferable that the engineering plastic penetrates into the concave portion to a region having a depth of ½ or more of the depth d of the concave portion. That is, it is preferable that the penetration depth D of the engineering plastic into the recess satisfies D ≧ d / 2.

The resin molded body portions (12 and 13) constituting the metal / resin composite structure 1 according to the present embodiment include a columnar member 12 (boss protrusion) and a flat member 13 (square protrusion) that are erected in the unevenness forming region 11. At least one type of protruding member selected from the above.
The columnar member 12 refers to a columnar member erected perpendicularly to the metal support plate 10, and the shape of the joint surface may be a perfect circle, an ellipse, or a combination of an arc and a straight line. For example, it may have a shape like a land track.
The flat plate member 13 refers to a quadrangular column standing upright on the metal support plate 10, and the shape of the joint surface may be square or rectangular, a parallelogram, or a trapezoid. May be.

In this embodiment, it is preferable that the columnar member 12 includes a plurality of columnar members formed to have the same height dimension. The columnar member 12 may be used as it is as a spacer (corresponding to 23a and 23b in FIG. 2) for securing the accommodation space of the circuit board in the X-ray image detection apparatus.
Further, the columnar member 12 may have a shape provided with a function of a female screw and / or a male screw as described below. Here, FIG. 1 shows a columnar member 121 formed with a female screw as an example of the columnar member 12 provided with the function of a female screw and / or a male screw. The female screw and / or the male screw are effective for fixing the columnar member and a specific accessory member having a companion screw. In FIG. 2, the circuit board 26 is illustrated as a specific attachment member, but the attachment member of the present embodiment is not limited to the circuit board. The female screw is preferably inserted through the core of the columnar member, and the male screw is preferably formed around the top of the columnar member.

  In the present embodiment, the flat plate member 13 is preferably formed with a female screw. That is, as shown in FIG. 1, the flat plate member 13 preferably includes a columnar member 131 in which a female screw is formed. The function of the female screw is also to fasten a specific member in the case of the female screw provided to the columnar member 12. The flat plate member 13 may be formed with a male screw like the columnar member 12.

The columnar member 12 or the flat plate member 13 may be provided with fitting means other than screws.
For example, as shown in FIG. 3, the insertion hole 54 with the leaf spring portion 54 a provided in the resin molded body portion 51 (columnar member or flat plate member) is provided in the circuit board 26 or the casing 24. It can be used for inserting and fixing by inserting the insertion protrusion 64 with the engaging protrusion 64a of the engaging protrusion 61.

  Hereinafter, each member which comprises the metal / resin composite structure which concerns on this embodiment is demonstrated.

<Resin molding part>
Examples of the engineering plastic constituting the resin molded body part according to the present embodiment include polyphenylene sulfide resin (PPS), polysulfone resin, polyether sulfone resin, polyether ether ketone resin (PEEK), polyarylate resin, and liquid crystal polymer. , Aromatic polyester resin, polyimide resin, polyamideimide resin, polyetherimide resin, aramid resin, polycarbonate resin, polyacetal resin, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylene dimethyl terephthalate (PCT), etc. Polyester resin, polyphenylene ether resin, polyphenylene oxide, nylon 6, nylon 66, polyamide resin such as aromatic polyamide, syndiota Chick polystyrene, ultra high molecular weight polyethylene, and the like. These resins may be used alone or in combination of two or more.
Among these, it is preferable to include one or two or more selected from the group consisting of PPS, PEEK, PBT, and PCT from the viewpoint of availability and bonding strength between the metal support plate and the resin molded body. .

From the viewpoint of adjusting the difference in linear expansion coefficient between the metal support plate and the resin molded body part and improving the mechanical strength of the resin molded body part, the engineering plastic constituting the resin molded body part according to the present embodiment uses a filler. Further, it may be included.
As such a filler, for example, one or more selected from the group consisting of glass fiber, carbon fiber, carbon particle, clay, talc, silica, mineral, and cellulose fiber can be selected. Among these, Preferably it is 1 type, or 2 or more types selected from the group which consists of glass fiber, carbon fiber, talc, and a mineral. The shape of the filler is not particularly limited, and examples thereof include a fiber shape, a particle shape, and a plate shape.

  The filler preferably has a filler having a maximum length in the range of 10 nm to 600 μm in a fraction of 5 to 100%. The maximum length is more preferably 30 nm to 550 μm, and still more preferably 50 nm to 500 μm. Moreover, the fraction of the filler in the range of the maximum length is more preferably 10 to 100%, and further preferably 20 to 100%.

<Metal support plate including irregularities formation region>
The metal support plate according to the present embodiment is made of at least one alloy material selected from an aluminum alloy and a magnesium alloy, and includes an unevenness forming region formed in an uneven shape on the surface of the metal support plate.
The metal support plate is, for example, a known roughening method after an aluminum alloy plate or a magnesium alloy plate is processed into a desired shape by cutting, plastic processing, punching processing, cutting, polishing, slow-thickening processing, or the like as necessary. Can easily be obtained by treating the surface.

  Examples of the aluminum alloy include an alloy of Al and one or more metals selected from the group consisting of Cu, Mn, Si, Mg, Zn, Ni, and the like. Specifically, alloy numbers 1050, 1100, 2014, 2024, 3003, 5052, 6063, 7075, etc. defined in JIS H4000 are preferably used.

  Examples of the magnesium alloy include one selected from the group consisting of Mg and rare earths such as Al, Zn, Mn, Si, Cu, Fe, Ag, Zr, Sr, Pb, Re, Y, and Misch metal. Mention may be made of alloys with two or more metals. Typical magnesium alloys include AZ91, AM60, AM50, AM20, AS41, AS21, AE42 and the like. The magnesium alloy according to the present embodiment includes magnesium such as a magnesium alloy material standardized by the American Society for Testing and Materials (ASTM), a magnesium alloy standardized by the Japanese Industrial Standard (JIS), the International Organization for Standardization (ISO), or the like. All alloy materials used as main metals are included.

  As an alloy material constituting the metal support plate according to this embodiment, the specific gravity is light, the specific strength is high, the damping ability is excellent, the machinability is excellent, and the dimensional stability is excellent. For reasons such as a point, it is preferable to use a magnesium alloy.

  Molding of commercially available aluminum alloys or magnesium alloys is generally performed by rolling, die casting, injection molding, etc., and machine oils and mold release agents used in the molding process are formed on the surface of the alloy compact. Adhering or penetrating. Therefore, the metal support plate according to the present embodiment formed from an aluminum alloy or a magnesium alloy is subjected to a degreasing treatment with an alkaline aqueous solution such as sodium hydroxide or potassium hydroxide aqueous solution before the surface roughening treatment. Is desirable.

As a roughening method for a metal support plate made of an aluminum alloy or a magnesium alloy, any known method can be used without limitation as long as the unevenness forming region is formed on the surface of the metal support plate. As a roughening treatment method for a metal support plate made of an aluminum alloy, for example, a method using an acid-based etching agent (International Publication No. 2015/008847, JP 2001-348684, etc.), hydrated hydrazine, ammonia, and A method of treating with one or more amine-based aqueous solutions selected from water-soluble amine compounds (International Publication No. 2009/31632 pamphlet, Japanese Patent Application Laid-Open No. 2005-119005, etc.), A method of treating with warm water at a specific temperature (Japanese Patent No. 505893, etc.) ) Etc. can be illustrated as a preferable method. Further, as a roughening treatment method for a metal support plate made of a magnesium alloy, a method of combining a citric acid aqueous solution treatment, a smut treatment and a potassium acetate / acetic acid / sodium acetate-containing aqueous solution treatment (Patent No. 5129903), rough etching with an acetic acid aqueous solution And a method of sequentially performing fine etching with a nitric acid aqueous solution (Patent No. 4442220), a method using an aqueous solution containing an organic nitrogen compound such as inorganic acid / organic acid / hydroxylamine other than nitric acid as an etching agent (Japanese Patent Laid-Open No. 2006-104896) A chemical method such as the above can be exemplified as a preferred method.
Other methods, such as an anodizing method, a mechanical cutting method such as sand blasting, knurling, and laser processing can also be employed.

  By performing the surface roughening treatment in this manner, the unevenness forming region can be formed on the surface of the metal support plate. The unevenness formation region may be any one of the entire surface of the metal support plate, the entire surface of both surfaces, or only the joint portion of the resin molded body part, but from the viewpoint of work efficiency when the surface roughening process is performed by a chemical method. The entire surface on both sides is preferred. Then, the metal / resin composite structure which concerns on this embodiment is obtained by integrally forming the resin molding part which concerns on this embodiment with respect to the unevenness | corrugation formation area | region of a metal support plate. When the engineering plastic constituting the resin molded body part penetrates into the concave-convex recesses in the concave-convex formation region, an anchor effect appears. Therefore, the resin molded body portion and the metal support plate can be bonded with good bonding strength without using an adhesive.

  As described above, the resin molded body portion bonded on the metal support plate may exist only on one side of the metal support plate or may exist on both sides. When the resin molded body part is mounted only on one side of the metal support plate having the concavo-convex formation region, when the warpage due to molding shrinkage is observed, it is preferable to mount the resin molded body part on both sides of the metal support plate. At this time, the resin molded body part joined to one surface of the metal support plate and the resin molded body part joined to the other surface are the same so that they face each other in the vertical direction of the metal support plate surface. It is preferable to arrange in the position. By doing so, it is possible to suppress the warping phenomenon that the metal support plate is deformed due to shrinkage during molding.

<Method for producing metal / resin composite structure>
Examples of the method for manufacturing a metal / resin composite structure according to the present embodiment, that is, a method of joining a resin molded body portion made of engineering plastic to a metal support plate having an unevenness forming region include, for example, injection molding and extrusion molding. And resin molding methods such as hot press molding, compression molding, transfer molding, casting molding, laser welding molding, reaction injection molding (RIM molding), rim molding (LIM molding), and thermal spray molding.
Among these, the injection molding method is preferable. Specifically, a metal support plate is inserted into a cavity portion of an injection mold, and a resin molded body portion is molded by an injection molding method in which engineering plastic is injected into a mold to produce a metal / resin composite structure. Is preferred.

Specifically, the method for producing a metal / resin composite structure using the injection molding method includes the following steps [1] to [3].
[1] Step of preparing a desired engineering plastic or a composition containing the same [2] Step of installing a metal support plate including an unevenness forming region inside a mold for injection molding [3] Injection molding of engineering plastic Step of forming a resin molded body part by injection molding into a mold so as to be in contact with at least the unevenness forming region of the metal support plate through the machine

Hereinafter, the injection molding method according to the steps [2] and [3] will be described.
First, a mold for injection molding is prepared, the mold is opened, and a metal support plate including a concavo-convex formation region is installed in a part thereof.
Thereafter, the mold is closed, and the resin composition obtained in the step [1] is injected into the mold and solidified so that at least a part of the engineering plastic is in contact with the concave shape forming region on the surface of the metal support plate. . Thereafter, the metal / resin composite structure can be obtained by opening the mold and releasing the mold.

  In addition to injection molding by the steps [1] to [3], injection foam molding or high-speed heat cycle molding (RHCM, heat & cool molding) for rapidly heating and cooling the mold may be used in combination. .

  As a method of injection foam molding, a method of adding a chemical foaming agent to the resin; a method of injecting nitrogen gas or carbon dioxide gas directly into the cylinder part of the injection molding machine; a nitrogen gas or carbon dioxide gas in the supercritical state of the injection molding machine MuCell injection foam molding method for injecting into the cylinder part; and the like. In any method, a metal / resin composite structure in which the resin member is a foam can be obtained. In any method, a counter pressure can be used as a mold control method, or a core back can be used depending on the shape of a molded product.

  High-speed heat cycle molding can be carried out by connecting a rapid heating / cooling device to a mold. The rapid heating / cooling apparatus may be a generally used system. As a heating method, any one of a steam type, a pressurized hot water type, a hot water type, a hot oil type, an electric heater type, an electromagnetic induction overheating type, or a combination of them may be used. As a cooling method, any one of a cold water type and a cold oil type or a combination thereof may be used. As conditions for the high-speed heat cycle molding method, it is desirable that the injection mold is heated to a temperature of 100 ° C. or higher and 250 ° C. or lower, and the injection mold is cooled after the injection of the engineering plastic is completed. The preferred range for heating the mold is different depending on the engineering plastic constituting the resin composition. If the resin is a crystalline resin and the melting point is less than 200 ° C., the temperature is preferably 100 ° C. or more and 150 ° C. or less. In the case of a resin having a melting point of 200 ° C. or higher, 140 ° C. or higher and 250 ° C. or lower is desirable. About an amorphous resin, 100 degreeC or more and 180 degrees C or less are desirable.

  In the present embodiment, as described above, the resin molded body portion includes one or more members selected from a columnar member and a flat plate member that are erected from the unevenness forming region on the metal support plate. The columnar member or the flat plate member can be formed with a female screw or a male screw by subjecting these members to additional processing as necessary.

2. X-ray image detection apparatus FIG. 2 is a cross-sectional view schematically showing an example of the structure of an X-ray image detection apparatus 2 (electronic cassette) manufactured by incorporating the metal / resin composite structure 1 according to the embodiment of the present invention. FIG.
The X-ray image detection apparatus 2 according to this embodiment includes a flat panel detector 22 that receives radiation transmitted through a subject and detects a radiation image, and a metal support plate 21 behind the flat panel detector 22 in the radiation irradiation direction. Is arranged so as to be adjacent to the flat panel detector 22 and controls the flat panel detector 22 mounted on the resin molded body portion 23 of the metal / resin composite structure 1 according to this embodiment. And a housing 24 that accommodates the flat panel detector 22, the metal / resin composite structure 1, and the circuit board 26. In the case where the resin molded body portion 23 is bonded to both surfaces of the metal support plate 21, the metal support plate 21 and the flat panel detector 22 have a resin bond portion mounted on the X-ray incident side of the metal support plate 21. It is preferable to arrange them adjacent to each other with a clearance that can be accommodated.

Hereinafter, the X-ray image detection apparatus 2 according to the present embodiment will be described with reference to the drawings.
The X-ray image detection apparatus shown in FIG. 2 is a portable electronic cassette, but the X-ray image detection apparatus 2 according to the present embodiment is not limited to this electronic cassette. The electronic cassette of FIG. 2 explained an ISS (Irradiation Side Sampling) type flat panel detector (hereinafter sometimes abbreviated as FPD) in which the photoelectric conversion layer 22b and the scintillator 22a are arranged in this order from the X-ray incident direction. However, the present invention is not limited to this structure. For example, an electronic cassette using a PSS (Penetration Side Sampling) type FPD in which a scintillator and a photoelectric conversion layer are arranged in this order from the X-ray incident direction may be used. In the present embodiment, an electronic cassette using a direct conversion type FPD using a conversion layer (for example, amorphous selenium or the like) that directly converts X-rays into charges without using a scintillator may be used.

  The X-ray image detection apparatus 2 according to the present embodiment includes, for example, a housing 24 (in FIG. 2, the housing front case side on the side through which X-rays pass is not shown, but only the back case side is shown. ), A transmission plate 25 arranged on the X-ray side, a flat panel detector 22, a resin molded body portion 23 joined to the metal support plate 21, and a female screw erected on the surface opposite to the X-ray incident direction of the metal support plate 21. A circuit board 26 fitted and fixed to a resin molded body 23 such as a columnar member with a function, and a housing 24 are provided.

  The transmission plate 25 has a property of easily transmitting X-rays and serves as a substrate for the flat panel detector 22. The transmission plate 25 may be a glass such as liquid crystal glass or a plastic film, but is preferably a plastic film in the sense that weight can be reduced and resistance to impact can be improved. Examples of plastic films include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyetherimide, polyetheretherketone, polyphenylene sulfide, polyarylate, polyimide, polycarbonate (PC), and cellulose. Examples include films made of triacetate (TAC), cellulose acetate propionate (CAP), and the like. Furthermore, if necessary, these plastic films may be added with a plasticizer such as trioctyl phosphate or dibutyl phthalate, or a known ultraviolet absorber such as benzotriazole or benzophenone. The transmission plate 25 may be made of a carbon material that is lightweight, has high rigidity, and has high X-ray permeability.

The flat panel detector 22 includes, for example, a photoelectric conversion layer 22b and a scintillator 22a. The scintillator 22a is made of, for example, CsI: Tl (thallium activated cesium iodide) or Cd ₂ O ₂ S: Tb (GOS), and converts X-rays into visible light (indirect conversion type). The photoelectric conversion layer 22b is provided with a plurality of pixels arranged in a matrix. Each pixel includes a photodiode that generates a signal charge in response to visible light incident from the scintillator, a capacitor for storing charge, and a thin film transistor (TFT) that reads the charge from the capacitor (none of which is shown). ing.

  The TFT to the circuit board 26 are connected by means (not shown) such as a flexible cable so that charge / signal information from the photoelectric conversion film can be transmitted to the circuit board.

  The metal support plate 10 shown in FIG. 1 corresponds to the metal support plate 21 in FIG. 2, and the resin molded body portions (12 and 13) shown in FIG. It corresponds to.

  Various materials can be used in combination in the X-ray image detection apparatus 2 according to the present embodiment as necessary. For example, in order to prevent X-rays from passing through the back plate of the housing, and to minimize the influence from secondary radiation, a material that effectively absorbs X-rays, such as a lead plate, is used. Use together is a preferred embodiment.

  As described above, the height of the resin molded body portion 23 (columnar member or flat plate member) joined to the metal support plate 21 is adjusted, or the resin molded body portion 23 (columnar member or flat plate member) is internally threaded. For example, the fixing of the circuit board 26 on the metal support plate 21 or the strong connection between the metal support plate 21 and the housing 24 by providing a mechanical fitting means, a male screw, or the like is illustrated. Such a fitting method (a fitting part 23c between the resin molded body part 23 and the casing 24 and a fitting part 23d for fixing the circuit board 26 to the metal support plate 21) is possible. In addition, the prevention of the dent of the housing 24 (the electronic cassette housing back plate) and the improvement of the impact resistance of the housing 24 main body are the stress of the contact portion 23a and the housing 24 provided for maintaining the shape of the housing 24. It can be remarkably improved by providing a support column of the spacer portion 23b for preventing deformation.

  As mentioned above, although embodiment of this invention was described, these are illustrations of this invention and various structures other than the above are also employable.

  Hereinafter, the present embodiment will be described in detail with reference to examples. In addition, this embodiment is not limited to description of an Example at all.

[Example 1]
Example 1 is an experimental example showing that the tensile shear strength between metal and resin is remarkably excellent in a metal / resin composite structure obtained by injection-molding engineering plastic on the surface of a roughened magnesium alloy plate. is there.

(Preparation of PPS composition as engineering plastic)
First, 100 parts by mass of high-density polyethylene (density: 0.95 g / cm ³ , MFR = 5 g / 10 min), 0.8 parts by mass of maleic anhydride and organic peroxide (manufactured by NOF Corporation, Perhexin-25B) 07 parts by mass were mixed with a Henschel mixer. Subsequently, the obtained mixture was melt-grafted by a 65 mmφ single screw extruder set at 230 ° C. to obtain a modified polyolefin.
Next, 10% by mass of the resulting modified polyolefin is blended with respect to the polyphenylene sulfide-containing resin composition (A503-X05 manufactured by Toray Industries, Inc., PPS content: 70% by mass, glass fiber (GF) content: 30% by mass). Then, the mixture was melt-kneaded at a cylinder temperature of 320 ° C. with a twin-screw extruder (TEX30α manufactured by Nippon Steel). Thereafter, the kneaded product was extruded into a strand shape, cooled in a water bath, the strand was taken up with a pelletizer, and cut to obtain a pellet-shaped PPS composition. The component types and amounts in the PPS composition are as follows.
PPS: 63% by mass
Modified polyolefin: 10% by mass
GF: 27% by mass

(Roughening treatment)
The magnesium alloy plate was roughened according to Example 1 of Japanese Patent No. 5129903. That is, a commercially available 1 mm thick magnesium alloy plate AZ31B was cut into a rectangular shape of 45 mm × 18 mm. After immersing in a commercially available aqueous solution (7.5% by weight) of a degreasing agent “cleaner 160 (manufactured by Meltex Co., Ltd.)” for magnesium alloy at a temperature of 65 ° C., this was thoroughly washed with water. Next, it was immersed in a hydrated citric acid aqueous solution (1% by weight) at 40 ° C. for 4 minutes and washed with water. Next, it was immersed in a mixed aqueous solution of sodium carbonate and sodium hydrogen carbonate (1 wt% each) at 65 ° C. for 5 minutes, and then thoroughly washed with water.

  Next, an aqueous caustic soda solution (15 wt%) was immersed in the solution at a temperature of 65 ° C. for 5 minutes and then washed with water. Next, it was immersed in a hydrated citric acid aqueous solution (0.25% by weight) at 40 ° C. for 1 minute, and then washed with water. Finally, after being immersed in an aqueous solution containing 2% by weight of potassium permanganate, 1% by weight of acetic acid and 0.5% by weight of hydrated sodium acetate at 45 ° C. for 1 minute, it was washed with water for 15 seconds, and further heated to 90 ° C. It put into the warm air dryer which was ℃ 15 minutes, and dried.

  Ten-point average roughness (Rz) was measured based on JIS B601 using a surface roughness measuring device “Surfcom 1400D (manufactured by Tokyo Seimitsu Co., Ltd.)” with respect to the roughened surface of the obtained magnesium alloy plate. As a result, Rz was 1.3 μm.

(Injection joining)
A small dumbbell metal insert mold was attached to an injection molding machine J85AD manufactured by Nippon Steel Works, and the roughened magnesium alloy plate obtained by the above method was placed in a mold heated to 135 ° C. Next, the PPS composition obtained by the above method is injection molded into the mold under the conditions of a cylinder temperature of 315 ° C., an injection speed of 25 mm / sec, a holding pressure of 80 MPa, and a holding time of 5 seconds. A resin composite structure was obtained. Using the obtained metal / resin composite structure, a tensile shear test was performed to measure the bonding strength. As a result, it was 27.5 MPa (resin base material fracture), and the tensile shear strength between the metal and the resin in the metal / resin composite structure was remarkably excellent.

DESCRIPTION OF SYMBOLS 1 Metal / resin composite structure 10 Metal support plate 11 Unevenness formation area 12 Columnar member (resin molding part)
121 Columnar Member with Female Screws 13 Flat Plate Member (Resin Molded Body)
131 Columnar member with female screw 2 X-ray image detection device 21 Metal support plate 22 Flat panel detector 22a Scintillator 22b Photoelectric conversion layer 23 Resin molded body portion 23a Contact portion 23b Spacer portion 23c Fitting portion 23d Fitting portion 24 Case Body 25 Transmission plate 26 Circuit board 51 Plastic molded body portion 54 Insertion hole 54a Leaf spring portion 61 Engaging projection 64 Insertion projection 64a Locking projection

Claims (8)

A metal support plate made of at least one alloy material selected from aluminum alloys and magnesium alloys;
A resin molded part made of engineering plastic;
With
The surface of the metal support plate includes a concavo-convex formation region formed in a concavo-convex shape,
The resin molded body part is bonded to the concavo-convex formation region, and the engineering plastic constituting the resin molded body part has entered the concavo-convex recessed part,
The resin molded body portion is a metal / resin composite structure for an X-ray image detection apparatus including at least one type of projecting member selected from a columnar member and a flat plate member provided upright in the unevenness forming region.   The metal / resin composite structure for an X-ray image detection apparatus according to claim 1, wherein the columnar member includes a plurality of columnar members formed to have the same height.   The metal / resin composite structure for an X-ray image detection apparatus according to claim 1, wherein the columnar member includes a columnar member in which a female screw and / or a male screw is formed.   The metal / resin composite structure for an X-ray image detection apparatus according to any one of claims 1 to 3, wherein a female screw is formed on the flat plate member.   The metal / resin composite structure for an X-ray image detection apparatus according to any one of claims 1 to 4, wherein an average value of a height difference between the convex and concave portions of the concave and convex shape is 10 nm or more and 200 µm or less.   The engineering plastic constituting the resin molded body part includes one or more selected from the group consisting of polyphenylene sulfide resin, polyether ether ketone resin, polybutylene terephthalate and polycyclohexylene dimethyl terephthalate. 6. A metal / resin composite structure for an X-ray image detection apparatus according to any one of 5 above. A flat panel detector that detects radiation images by receiving radiation transmitted through the subject;
The metal / resin composite structure according to any one of claims 1 to 6, wherein the metal support plate is disposed behind the flat panel detector in the radiation direction so as to be adjacent to the flat panel detector. When,
A circuit board for controlling the flat panel detector mounted on the resin molding part of the metal / resin composite structure;
A housing for housing the flat panel detector, the metal / resin composite structure, and the circuit board;
An X-ray image detection apparatus comprising:   The X-ray image detection apparatus according to claim 7, which is an electronic cassette.

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