JP2006133126A - Radiation image conversion panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation image conversion panel which is usable in a satisfactory state for a long period while keeping good sealability without breaking a protective film for protecting a stimulable phosphor layer provided on a substrate. <P>SOLUTION: The radiation image conversion panel 1 comprises the substrate 2 formed to have circular angle parts with a curvature radius R, the stimulable phosphor layer 3 formed on the surface of the substrate 2 by vapor phase deposition method, and protective films 4 and 5 covering and sealing the whole surface of the substrate 2 having the phosphor layer 3 formed thereon. The range of the curvature radius R is set to 1 to 10 mm. The peripheral part of the substrate 2 of the panel 1 is chamfered. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radiation image conversion panel having a photostimulable phosphor layer formed by a vapor deposition method.

  Conventionally, a digitized radiation image has been obtained from a subject by a radiation image conversion method using a radiation image conversion panel having a stimulable phosphor layer. Radiation image conversion method means that the stimulable phosphor layer is irradiated with the radiation transmitted through the subject, and the radiation energy corresponding to the radiation transmission density of each part of the subject is accumulated in the stimulable phosphor and then excited. The radiation energy accumulated in the photostimulable phosphor is stimulated to emit light, and the intensity of the stimulated emission light is converted into an electrical signal. This electrical signal is converted into an image recording material such as a photosensitive material or a CRT (Cathode Ray). Tube), LCD (Liquid Crystal Display), etc., and a visible image via a display device.

  The radiation image conversion panel is manufactured by forming a photostimulable phosphor layer on a substrate by a vapor deposition method or the like. Also, in order to withstand repeated use of the radiation image conversion panel, a protective layer is usually provided on the side of the stimulable phosphor layer that does not face the substrate, and the stimulable phosphor layer is subjected to chemicals such as moisture absorption and oxidation. To protect against natural alteration or physical contamination.

As a substrate for such a radiation image conversion panel, a metal layer such as aluminum having a certain degree of surface roughness is provided as a reflective layer on a substrate that generates a columnar crystal of a stimulable phosphor, thereby affecting the resolution. A radiation image conversion panel that increases the sensitivity of the CR system is known (Patent Document 1).
JP 2004-251883 A

  However, the substrate used in such a radiation image conversion panel usually has a square shape, and therefore the substrate 17 of the radiation image conversion panel 16 has corners as shown in FIG. Further, when the substrate 17 having a metal layer such as aluminum is formed by cutting with a punch and die, the substrate 17 used for the radiation image conversion panel 16 is as thin as about 1 mm, and therefore, as shown in FIG. In addition, burrs 19 are generated at the peripheral edge of the substrate 17.

  As described above, when the protective film is brought into contact with the substrate 17 and sealed in a state where the substrate 17 has corners or burrs 19 are generated on the peripheral edge of the substrate 17, the protective film is damaged and damaged. There was a case. Moreover, when the thickness dimension of the board | substrate 17 is larger than predetermined, a slip and a wrinkle will generate | occur | produce in a protective film and the protective film might be damaged in a wrinkle part. In such a case, since the hermeticity cannot be maintained, the photostimulable phosphor layer 18 cannot be protected from chemical alteration or physical contamination such as moisture absorption or oxidation, and the radiation image conversion panel 16 is not protected. There was a problem that the sensitivity could not be maintained.

  An object of the present invention is to provide a radiation image conversion panel that can be used in a good condition for a long period of time without damaging the protective film that protects the photostimulable phosphor layer provided on the surface of the substrate without damaging the protective film. It is in.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a radiation image conversion panel, wherein a corner portion is formed in an arc shape having a curvature radius R, and a vapor deposition method is performed on the substrate. And a protective film that covers and seals the entire surface of the substrate on which the photostimulable phosphor layer is formed.

  According to the invention described in claim 1, since the corners of the substrate are formed to have an arc shape with a radius of curvature R, the entire surface of the substrate on which the photostimulable phosphor layer is formed is covered. Even if the protective film to be sealed is brought into contact with the corner of the substrate, the protective film is not damaged.

  A second aspect of the present invention is the radiation image conversion panel according to the first aspect, wherein the range of the radius of curvature R is 1 mm to 10 mm.

  According to the second aspect of the present invention, since the radius of curvature R at the corner of the substrate is 1 mm to 10 mm, the protective film is not damaged even if it contacts the corner of the substrate. .

  A third aspect of the present invention is the radiographic image conversion panel according to the first or second aspect, wherein the peripheral edge of the substrate is chamfered.

  According to the invention described in claim 3, since the burr is removed by chamfering the peripheral portion of the substrate, the protective film is damaged by the burr even if the protective film is brought into contact with the peripheral portion of the substrate. Never do.

  A fourth aspect of the present invention is the radiographic image conversion panel according to the first or second aspect, wherein the peripheral edge of the substrate is coated with a resin tape.

According to invention of Claim 4, since the peripheral part of a board | substrate is coat | covered with the resin tape, since the burr | flash formed in the peripheral part of the board | substrate is covered with the resin tape, a protective film is a peripheral part of a board | substrate. The protective film is not damaged by the burr even if it is brought into contact with the surface.
The invention according to claim 5 is the radiation image conversion panel according to claim 4, wherein the thickness dimension of the resin tape is 0.05 mm or more.

  According to the fifth aspect of the present invention, if the thickness dimension of the resin tape covering the peripheral edge of the substrate is 0.05 mm or more, the burr generated in the stage of manufacturing the substrate can be covered with the resin tape. The protective film can be prevented from being damaged by burrs when the protective film is brought into contact with the peripheral edge of the substrate.

  A sixth aspect of the present invention is the radiation image conversion panel according to any one of the first to fifth aspects, wherein the thickness dimension of the substrate is 0.2 mm to 1 mm. To do.

  According to the invention described in claim 6, the photostimulable phosphor layer is formed by setting the thickness of the substrate to 0.2 mm or more and ensuring the rigidity of the substrate, while setting the thickness of the substrate to 1 mm or less. It is possible to prevent creases and wrinkles generated on the surface of the protective film that covers and seals the entire surface of the substrate.

  A seventh aspect of the present invention is the radiation image conversion panel according to any one of the first to sixth aspects, wherein the substrate is a carbon plate or an aluminum plate.

  According to invention of Claim 7, the effect | action similar to Claims 1-6 can be obtained using a carbon plate or an aluminum plate as a board | substrate.

  Invention of Claim 8 is a radiation image conversion panel as described in any one of Claims 1-7, Comprising: The said protective film is two types of protective films which cover the said stimulable fluorescent substance layer A laminated film obtained by laminating two or more of the above resin film layers, wherein at least one layer is a resin film layer on which a metal oxide is deposited.

  According to the invention described in claim 8, the metal oxide is deposited even when the substrate on which the photostimulable phosphor is formed is sealed with the moisture-proof protective film including the resin film layer on which the metal oxide is deposited. The resin film layer is not damaged and the moisture resistance is not impaired.

  According to the first aspect of the present invention, since the protective film is not damaged at the corners of the substrate, the moisture-proof property of the protective film is maintained, and the deterioration of the sensitivity of the radiation image conversion panel can be prevented.

  According to the second aspect of the present invention, since the protective film is not damaged at the corners of the substrate, the moisture-proof property of the protective film is maintained, and the deterioration of the sensitivity of the radiation image conversion panel can be prevented.

  According to the third aspect of the present invention, since the protective film is not damaged by the burr, it is possible to prevent the deterioration of the sensitivity of the radiation image conversion panel while maintaining the moisture resistance of the protective film.

  According to the fourth aspect of the present invention, since the protective film is not damaged by the burr, it is possible to prevent the deterioration of the sensitivity of the radiation image conversion panel while maintaining the moisture resistance of the protective film.

  According to the fifth aspect of the present invention, since the protective film is not damaged by the burr, it is possible to prevent the deterioration of the sensitivity of the radiation image conversion panel while maintaining the moisture resistance of the protective film.

  According to the invention described in claim 6, since it is possible to prevent creases and wrinkles generated on the surface of the protective film, the protective film is not damaged at the wrinkles, and the moisture resistance of the protective film is maintained and radiation is maintained. It is possible to prevent deterioration of the sensitivity of the image conversion panel.

  According to the seventh aspect of the present invention, the same effects as in the first to sixth aspects can be obtained by using a carbon plate or an aluminum plate as the substrate.

  According to invention of Claim 8, even when using the moisture-proof protective film containing the resin film layer which vapor-deposited the metal oxide, it protects by preventing the damage of the resin film layer vapor-deposited with the metal oxide. It is possible to prevent the deterioration of the sensitivity of the radiation image conversion panel while maintaining the moisture resistance of the film.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a photostimulable phosphor layer 3 is formed on the surface of the substrate 2 of the radiation image conversion panel 1 leaving a peripheral portion of the substrate 2 of about 10 mm. Furthermore, as shown in FIG. 3, the substrate 2 on which the photostimulable phosphor layer 3 is formed is sealed with a first protective film 4 and a second protective film 5.

  As shown in FIG. 1, the substrate 2 has a substantially rectangular shape, and is formed so that the corner portion has an arc shape with a curvature radius R by cutting with a punch, a die, or the like. In the present embodiment, the radius of curvature R is preferably R = 1 mm to 10 mm. Moreover, it is preferable that the thickness dimension of the board | substrate 2 is 0.2 mm-1 mm. While it is necessary to ensure the rigidity of the substrate 2, if the substrate 2 has a thickness of 1 mm or more, the surface of the protective film is wrinkled and crushed when sealed by the first protective film 4 and the second protective film 5. It is because it becomes easy to generate | occur | produce.

Further, as shown in FIG. 2, the peripheral edge of the substrate 2 is chamfered by polishing with a file or the like. Thus the length l ₁ from the surface edges of the beveled substrate 2 to an end _portion, the height l ₂ of the portion of the _chamfer, the height l ₃ of chamfered sides, 0.01 respectively 0.5 cm. Moreover, after the chamfering, only minute burrs having a length dimension of 0.01 mm or less are left.

  As the substrate 2, various polymer materials, glass, ceramics, metals, carbon fibers, composite materials including carbon fibers, and the like can be used. For example, plate glass such as quartz, borosilicate glass, chemically tempered glass, and crystallized glass. Ceramics such as alumina and silicon silicon; plastic films such as cellulose acetate film, polyester film, polyethylene terephthalate film, polyamide film, polyimide film, triacetate film and polycarbonate film; metal sheets such as aluminum, iron, copper and chromium, and hydrophilic A metal sheet having a coating layer such as fine particles is preferred.

  The surface of the substrate 2 may be a smooth surface or a mat surface. Further, an undercoat layer may be provided on the surface of the substrate 2 for the purpose of improving the adhesiveness with the stimulable phosphor layer 3, or the substrate 2 transmits the stimulable phosphor layer 3. A light reflecting layer may be provided for the purpose of preventing the excitation light from entering.

  The photostimulable phosphor layer 3 is made of a known photostimulable phosphor such as CsBr: Eu, and includes a vapor deposition method, a sputtering method, a CVD (Chemical Vapor Deposition) method, a PVD (Physical Vapor Deposition) method, and an ion plate. It is formed by a known vapor deposition method such as a ting method. The photostimulable phosphor layer 3 may be composed of one layer or may be composed of two or more layers.

  Next, the first protective film 4 has a slightly larger area than the substrate 2, and its peripheral portion is outside the peripheral portion of the substrate 2 in a state where it is not substantially adhered to the photostimulable phosphor layer 3. It extends to. The state in which the first protective film 4 is not substantially bonded to the stimulable phosphor layer 3 means that the first protective film 4 and the stimulable phosphor layer 3 are optically integrated. Specifically, the contact area between the first protective film 4 and the photostimulable phosphor layer 3 is the surface of the photostimulable phosphor layer 3 (the surface facing the first protective film 4). The state is 10% or less of the area.

  On the other hand, the second protective film 5 also has a slightly larger area than that of the substrate 2, and its peripheral edge extends outward from the peripheral edge of the substrate 2.

  In the radiation image conversion panel 1, the peripheral portions of the first protective film 4 and the second protective film 5 are fused over the entire circumference, and the first protective film 4 and the second protective film 5 are bright. The substrate 2 on which the stimulable phosphor layer 3 is formed is completely sealed. The first protective film 4 and the second protective film 5 seal the substrate 2 on which the photostimulable phosphor layer 3 is formed, thereby reliably preventing moisture from entering, and the photostimulable phosphor layer. 3 is to be protected.

  As shown in the enlarged view at the top in FIG. 1, the first protective film 4 has a laminated structure in which three layers of a first layer 6, a second layer 7, and a third layer 8 are laminated.

  The first layer 6 is a layer facing the photostimulable phosphor layer 3 through the air layer 13, and is made of a resin having heat fusibility. Examples of the “resin having heat-fusibility” include ethylene vinyl acetate copolymer (EVA), casting polypropylene (CPP), polyethylene (PE) and the like.

  The second layer 7 is a layer made of a metal oxide such as alumina or silica, and is deposited under the third layer 8 by a known deposition method. Although the 2nd layer 7 strengthens the moisture-proof performance of the 1st protective film 4, it does not need to be. In the present embodiment, the thickness dimension of the second layer 7 is preferably about 0.03 mm. If the thickness dimension of the second layer 7 is about 0.03 mm, the second layer 7 is damaged by the burr if the length dimension of the burr generated at the peripheral edge of the substrate 2 is about 0.01 mm or less. It is because it is thought that there is nothing to do.

  The third layer 8 is laminated on the second layer 7 and is made of a resin such as polyethylene terephthalate (PET).

  Thus, the 1st protective film 4 which has the 2nd layer 7 comprised with the metal oxide is excellent in workability and transparency, and is temperature and humidity in terms of moisture-proof property and oxygen permeability. It is hard to be affected by. Therefore, the 1st protective film 4 is suitable for the medical radiation image conversion panel 1 of the photostimulable phosphor utilization type in which stable image quality is required regardless of the environment.

  Note that, on the third layer 8, the same layer as the first layer 6, the same layer as the second layer 7, the same layer as the third layer 8, or the first layer 6, the third layer One layer or two or more layers made of a resin different from the layer 8 may be laminated.

  In particular, when the same layer as the second layer 7 made of a metal oxide such as alumina or silica is laminated on the third layer 8, the first protective film 4 becomes the second layer 7. The optimum moisture-proof performance according to the number of layers corresponding to is exhibited. As a method for laminating the second layer 7 or the same layer as this, any known method can be applied, but it is preferable in terms of workability to apply a method according to a dry laminating method. .

  As shown in the enlarged view at the bottom in FIG. 1, the second protective film 5 has a laminated structure in which three layers of a first layer 10, a second layer 11, and a third layer 12 are laminated.

  The first layer 10 faces the substrate 2 of the phosphor panel 4 through the air layer 13. The first layer 10 is made of the same resin as the first layer 6 of the first protective film 4, and is fused to the first layer 6 of the first protective film 4 at the peripheral edge thereof.

  The second layer 11 is a layer laminated under the first layer 10 and is made of aluminum. Although the 2nd layer 11 improves the moisture-proof performance in the 2nd protective film 5, it does not need to be. In the present embodiment, the thickness dimension of the second layer 11 is preferably about 0.03 mm. If the thickness dimension of the second layer 11 is about 0.03 mm, the second layer 11 is damaged by the burr if the length dimension of the burr generated at the peripheral edge of the substrate 2 is about 0.01 mm or less. It is because it is thought that there is nothing to do.

  The third layer 12 is laminated under the second layer 11 and is made of a resin such as PET.

  Note that below the third layer 12, a layer similar to the first layer 10, a layer similar to the second layer 11, a layer similar to the third layer 12, or the first layer 6, One layer or two or more layers made of a resin different from the layer 8 may be laminated.

  Next, a method for manufacturing the radiation image conversion panel 1 according to this embodiment will be described.

  First, an aluminum plate or the like is cut by a punch and a die, so that the substrate 2 is formed into a substantially rectangular shape and a corner portion having an arc shape with a curvature radius R. In the present embodiment, the radius of curvature R is preferably R = 1 mm to 10 mm. Moreover, it is preferable that the thickness dimension of the board | substrate 2 shall be 0.2 mm-1 mm. While it is necessary to ensure the rigidity of the substrate 2, if the substrate 2 has a thickness of 1 mm or more, the surface of the protective film is wrinkled and crushed when sealed by the first protective film 4 and the second protective film 5. It is because it becomes easy to generate | occur | produce.

Then, the peripheral portion of the substrate 2 is chamfered by polishing with a file or the like. In this case, the length l ₁ from the surface edge of the chamfered board 2 to the _periphery, the height l ₂ of the portion of _chamfering, the chamfered sides height l _3, respectively from 0.01 to 0 Chamfered to 5 cm. As a result, after the chamfering, only minute burrs having a length dimension of 0.01 mm or less remain.

  Next, the photostimulable phosphor layer 3 is formed on the surface of the substrate 2 by a known vapor deposition method while leaving a peripheral portion of the substrate 2 of about 10 mm (hereinafter referred to as “stimulable phosphor layer forming step”). ).

  For example, in the case where the photostimulable phosphor layer 3 is formed by a vapor deposition method among a plurality of known vapor deposition methods, the substrate 2 is fixed and placed on a substrate holder in a vapor deposition apparatus. The inside of the vapor deposition apparatus is evacuated to a vacuum state. Thereafter, the stimulable phosphor is heated and evaporated by a resistance heating method, an electron beam method or the like using the stimulable phosphor as a deposition source, and the stimulable phosphor is deposited on the surface of the substrate 2 to a desired thickness. The phosphor layer 3 is grown to a size to form the photostimulable phosphor layer 3 on the surface of the substrate 2.

  After finishing the stimulable phosphor layer forming step, the substrate 2 on which the stimulable phosphor layer 3 is formed is placed in a known thermostatic chamber, and the interior of the thermostatic chamber is filled with air or an inert gas ( Nitrogen, argon, or the like) (may be a vacuum atmosphere), and the substrate 2 on which the photostimulable phosphor layer 3 is formed is heated at about 100 ° C. for a predetermined time in the atmosphere. 3 is removed from each columnar crystal (hereinafter referred to as “air / inert gas atmosphere heating step”).

  After finishing the air / inert gas atmosphere heating step, the substrate 2 on which the photostimulable phosphor layer 3 is formed is placed in a known thermostatic chamber, and the interior of the thermostatic chamber is made an organic solvent gas atmosphere. The substrate 2 on which the photostimulable phosphor layer 3 is formed in the atmosphere is heated at 100 ° C. or higher (preferably 100 ° C. or higher and 160 ° C. or lower) for a predetermined time (hereinafter referred to as “organic solvent gas atmosphere heating step”). ).

  When the organic solvent gas atmosphere heating process is finished, the substrate 2 on which the stimulable phosphor layer 3 is formed is placed inside a known constant temperature and humidity chamber, and the temperature inside the constant temperature and humidity chamber is set to a temperature of 23 to 60. The substrate 2 on which the photostimulable phosphor layer 3 is formed is humidified for 12 hours or longer under the environment of 30 ° C. and a relative humidity of 30 to 60% (hereinafter referred to as “humidification process”).

  When the humidification process is completed, the substrate 2 on which the photostimulable phosphor layer 3 is formed is placed in a known thermostatic chamber and heated at 60 to 160 ° C. for a predetermined time. A water component is removed from each columnar crystal and dehydrated (hereinafter referred to as “dehydration step”).

  When the dehydration process is completed, the substrate 2 on which the photostimulable phosphor layer 3 is formed is sandwiched between the first protective film 4 and the second protective film 5, and the first protective film 4 and the second protective film 4 are interposed. Each of the peripheral portions of the protective film 5 is heated and fused with an impulse sealer, and the substrate 2 on which the photostimulable phosphor layer 3 is formed is sealed with the first protective film 4 and the second protective film 5 ( Hereinafter referred to as “sealing step”).

  At this time, the thickness dimension of the second layer 7 in the first protective film 4 and the thickness dimension of the second layer 11 in the second protective film 5 are preferably about 0.03 mm. If the thickness dimension of the second layer 7 and the thickness dimension of the second layer 11 are about 0.03 mm, the length dimension of the burr generated at the peripheral edge of the substrate 2 is about 0.01 mm or less. This is because it is considered that the second layer 7 and the second layer 11 are not damaged by burrs.

  The radiation image conversion panel 1 according to the present embodiment can be manufactured by performing each process from the stimulable phosphor layer forming step to the sealing step.

  As described above, according to the radiation image conversion panel 1 of the present embodiment, since the corner portion of the substrate is formed in an arc shape with the radius of curvature R, the entire substrate on which the photostimulable phosphor layer is formed is formed. Even if the protective film covering and sealing the surface is brought into contact with the corner of the substrate, the protective film is not damaged.

  Moreover, since the range of the curvature radius R in the corner | angular part of a board | substrate is 1 mm-10 mm, even if a protective film contacts the corner | angular part of a board | substrate, it will not be damaged.

  Furthermore, since the burrs at the peripheral edge of the substrate are removed by chamfering, the protective film is not damaged by the burrs even when the protective film is brought into contact with the peripheral edge of the substrate.

  Moreover, while ensuring the rigidity of the substrate by setting the thickness dimension of the substrate to 0.2 mm or more, the entire surface of the substrate on which the photostimulable phosphor layer is formed is covered by setting the thickness of the substrate to 1 mm or less. It is possible to prevent creases and wrinkles generated on the surface of the protective film to be sealed.

  In addition, when using a moisture-proof protective film including a resin film layer deposited with a metal oxide such as alumina or silica, the moisture-proof property of the protective film is prevented by preventing damage to the resin film layer deposited with a metal oxide. Thus, the sensitivity of the radiation image conversion panel can be prevented from deteriorating.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same part as 1st Embodiment, the description is abbreviate | omitted, and a different part from 1st Embodiment is demonstrated.

  Similar to the first embodiment, the photostimulable phosphor layer 3 is formed on the surface of the substrate 2 of the radiation image conversion panel 1 so as to leave about 10 mm of the peripheral portion of the substrate 2.

  In addition, the substrate 2 has a substantially rectangular shape, and is formed so that the corner portion has an arc shape with a curvature radius R by cutting with a punch, a die, or the like. Also in the present embodiment, the radius of curvature R is preferably R = 1 mm to 10 mm, and the thickness dimension of the substrate 2 is preferably 0.2 mm to 1 mm.

  Furthermore, in the present embodiment, as shown in FIG. 4, the peripheral edge of the substrate 2 is coated with the resin tape 14 over the entire circumference. Here, it is preferable that the thickness dimension of the resin tape 14 is 0.05 mm or more. As described above, the peripheral edge of the substrate 2 is coated with the resin tape 14 having a thickness of 0.05 mm or more over the entire periphery, thereby covering the burr 15 generated at the peripheral edge of the substrate 2 and flattening the surface of the substrate 2. It is supposed to be.

  The substrate 2 and the photostimulable phosphor layer 3 are the same as those in the first embodiment in that they are sealed by the first protective film 4 and the second protective film 5.

Next, the difference between the method for manufacturing the radiation image conversion panel 1 according to the present embodiment and the first embodiment will be described.
First, an aluminum plate or the like is cut by a punch and a die, so that the substrate 2 is formed to have a substantially rectangular shape and a corner portion having an arc shape with a radius of curvature R. Also in the present embodiment, the radius of curvature R is preferably about R = 1 mm to 10 mm, and the thickness dimension of the substrate 2 is preferably 0.2 mm to 1 mm.

  Next, the stimulable phosphor layer 3 is formed on the surface of the substrate 2 by a known vapor deposition method (hereinafter referred to as “stimulable phosphor layer forming step”). When the photostimulable phosphor layer forming process is completed, an air / inert gas atmosphere heating process, an organic solvent gas atmosphere heating process, a humidification process, and a dehydration process are sequentially performed.

  And in this embodiment, as shown in FIG. 4, the peripheral part of the board | substrate 2 is coat | covered with the resin tape 14 over a perimeter. Here, the thickness dimension of the resin tape 14 is preferably 0.05 mm or more. Thus, by coating the peripheral edge of the substrate 2 with the resin tape 14 having a thickness of 0.05 mm or more over the entire periphery, the surface of the substrate 2 is flattened so as to cover the burr 15 generated at the peripheral edge of the substrate 2. To do.

  When the dehydration process is completed, the substrate 2 on which the photostimulable phosphor layer 3 is formed is sandwiched between the first protective film 4 and the second protective film 5, and the first protective film 4 and the second protective film 4 are interposed. Each of the peripheral portions of the protective film 5 is heated and fused with an impulse sealer, and the substrate 2 on which the photostimulable phosphor layer 3 is formed is sealed with the first protective film 4 and the second protective film 5 ( Hereinafter referred to as “sealing step”).

The radiation image conversion panel 1 according to the present embodiment can be manufactured by performing each process from the stimulable phosphor layer forming step to the sealing step.

  As described above, according to the radiation image conversion panel 1 of the present embodiment, since the peripheral edge of the substrate is coated with the resin tape over the entire periphery, the burr 15 formed on the peripheral edge of the substrate is covered with the resin tape. Even if the film comes into contact with the peripheral edge of the substrate, the burr 15 does not damage the protective film.

Further, if the thickness dimension of the resin tape covering the peripheral portion of the substrate is 0.05 mm or more, the burr 15 generated at the stage of manufacturing the substrate can be covered with the resin tape. Can be prevented.
As described above, according to the radiation image conversion panel 1 of the present invention,

  Since the protective film is not damaged at the corners of the substrate, the moisture-proof property of the protective film is maintained, and deterioration of the sensitivity of the radiation image conversion panel can be prevented.

Furthermore, since the protective film is not damaged by the burr 15 at the peripheral edge of the substrate, it is possible to maintain the moisture resistance of the protective film and prevent the sensitivity of the radiation image conversion panel from deteriorating.
In addition, since it is possible to prevent creases and wrinkles that occur on the surface of the protective film, the protective film is not damaged at the wrinkles, and the moisture-proof property of the protective film is maintained to prevent deterioration of the sensitivity of the radiation image conversion panel. can do.

  In addition, even when using a moisture-proof protective film including a resin film layer deposited with a metal oxide such as alumina or silica, the moisture-proof property of the protective film is prevented by preventing damage to the resin film layer deposited with a metal oxide. Thus, the sensitivity of the radiation image conversion panel can be prevented from deteriorating.

[Example 1]
<Preparation of sample>
An aluminum plate having a thickness of 0.5 mm was punched out with a punch and a die, and a substrate having a square shape of 20 cm × 20 cm and an arc shape with a corner radius of curvature R = 5 mm was produced. Next, a photostimulable phosphor layer having a thickness of 500 μm was formed by a vapor deposition method, leaving a peripheral portion of 10 mm on the surface of the substrate.

  At the same time, a first moisture-proof protective film obtained by laminating a PET layer having a thickness of 12 μm, a PET layer having a thickness of 12 μm deposited with alumina, and a CPP layer having a thickness of 30 μm, a PET layer having a thickness of 188 μm, and an aluminum having a thickness of 9 μm A second moisture-proof protective film in which a layer (aluminum foil) and a 30 μm thick CPP layer were laminated was prepared. However, in the first moisture-proof protective film, in the 12 μm-thick PET layer on which alumina is vapor-deposited, the vapor-deposited surface of alumina faces and contacts the CPP layer.

  Thereafter, the CPP layer of the first moisture-proof protective film is opposed to the photostimulable phosphor layer, and the CPP layer of the second moisture-proof protective film is opposed to the substrate. The moisture-proof protective films were stacked on top of each other. Then, while decompressing the space surrounded by the first and second moisture-proof protective films, the peripheral portions of the first and second moisture-proof protective films are fused with an impulse sealer, and the first and second The substrate on which the photostimulable phosphor layer was formed in the moisture-proof protective film was sealed.

  When the peripheral portions of the first and second moisture-proof protective films are fused to each other, an impulse sealer having a heater of 3 mm is used, and the first moisture-proof protective film and the second moisture-proof protective film are used. It processed so that the space | interval from a fusion | melting part to the peripheral part of a fluorescent substance panel might be set to 3 mm.

[Example 2]
The peripheral portion of the substrate of Example 1 was polished with a file and deburred, and a radiation image conversion panel was obtained.

[Example 3]
The peripheral edge of the substrate of Example 1 was coated with a polypropylene film having a thickness of 0.1 mm over the entire circumference, and a radiation image conversion panel was obtained.

[Example 4]
The thickness dimension of the substrate of Example 1 was set to 1.0 mm, and the peripheral portion of the substrate was polished with a file to perform a deburring process, thereby obtaining a radiation image conversion panel.

[Example 5]
The thickness dimension of the substrate of Example 1 was set to 1.5 mm, and the peripheral portion of the substrate was polished with a file to perform a deburring process, and then a radiation image conversion panel was obtained.

[Comparative Example 1]
The board | substrate of Example 1 was cut and formed in thickness dimension 1.5mm by the press-cutting method, and the radiation image conversion panel was obtained in the state which made the corner | angular part the acute angle.

<Evaluation of thread and wrinkles>
A sample of the radiation image conversion panel prepared by sealing the substrate on which the photostimulable phosphor layer was formed was sealed with a protective film, and observed the state of creases and wrinkles generated on the surface of the radiation image conversion panel. . Table 1 shows the number of creases and wrinkles generated on the surface of the radiation image conversion panel among the 10 prepared samples.

<Evaluation of sensitivity degradation>
A sample of a radiation image conversion panel produced by sealing a substrate on which a photostimulable phosphor layer is formed with a protective film is left in a high temperature environment at a temperature of 40 ° C. and a humidity of 90% for 3 months. The ratio between the sensitivity and the sensitivity after 3 months was calculated. The sensitivity is measured by irradiating the radiation image conversion panel with X-rays having a tube voltage of 80 kVp, and then exciting the radiation image conversion panel by scanning with a He—Ne laser beam (633 nm) from the stimulable phosphor layer. The stimulated luminescence emitted was received by a photoreceiver (photomultiplier tube with spectral sensitivity S-5) and the intensity thereof was measured. Table 10 shows the average value of the ratios of the initial sensitivity and the sensitivity after 3 months for 10 samples. The values shown in Table 1 indicate that the closer to 1, the less the sensitivity degradation.

  As shown in Table 1, in Example 1, since the corner portion of the substrate was formed in an arc shape, the alumina layer of the protective film was not broken at the corner portion, and the sensitivity deterioration was small. Moreover, the thickness dimension of the board | substrate was 0.5 mm and the slip and wrinkle of the protective film were not observed. Therefore, the alumina layer was not destroyed in the wrinkled part, and the sensitivity was less deteriorated.

  Further, in Example 2, since the deburring process is further performed, the alumina layer of the protective film is not broken by the burr generated at the peripheral edge of the substrate. Therefore, sensitivity deterioration is further suppressed.

  Further, although the deburring process is not performed in Example 3, since the peripheral edge of the substrate is coated with the resin tape over the entire circumference, the burr is also covered with the resin tape, so that the alumina layer of the protective film is covered with the burr. It will not be destroyed. Therefore, the sensitivity deterioration is suppressed as in the case where the deburring process is performed in the second embodiment.

  In Example 4, a radiographic image panel was produced under the same conditions as in Example 2 except that the thickness dimension of the substrate was set to 1.0 mm. However, the sensitivity deterioration was suppressed almost as in Example 2.

  On the other hand, in Example 5, a radiographic image panel was produced under the same conditions as in Example 2 except that the thickness of the substrate was 1.5 mm. However, the thickening of the substrate caused creases and wrinkles in the protective film. As a result, the deterioration of the sensitivity was observed due to the destruction of the alumina layer in the wrinkled part.

  Further, in Comparative Example 1, since the thickness of the substrate is set to 1.5 mm, the corner portion of the substrate is set to an acute angle, and the deburring process is not performed, so that the sensitivity deterioration is remarkable. Thereby, it was shown that when the alumina layer of the protective film is broken at the wrinkles of the protective film, the corners of the substrate, and the burrs on the peripheral edge of the substrate, the sensitivity deterioration becomes significant.

It is a top view which shows the board | substrate and photostimulable phosphor layer of the radiographic image conversion panel which concern on this embodiment. It is sectional drawing which shows the board | substrate and photostimulable phosphor layer of the radiographic image conversion panel which concern on this embodiment. It is sectional drawing which shows the state by which the board | substrate and photostimulable phosphor layer of the radiographic image conversion panel which concern on this embodiment were sealed with the protective film. It is sectional drawing which shows the state which attached the resin tape to the board | substrate of the radiographic image conversion panel which concerns on this embodiment. It is a top view which shows the board | substrate of the conventional radiographic image conversion panel. It is sectional drawing which shows the board | substrate of the conventional radiographic image conversion panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radiation image conversion panel 2 Substrate 3 Stimulable phosphor layer 4 First protective film 5 Second protective film 6 First layer 7 Second layer 8 Third layer 9 Air layer 10 First layer 11 Second layer 12 Third layer 13 Air layer 14 Resin tape 15 Burr

Claims (8)

A substrate formed such that a corner has an arc shape with a radius of curvature R;
A photostimulable phosphor layer formed on the substrate by vapor deposition;
A protective film that covers and seals the entire surface of the substrate on which the photostimulable phosphor layer is formed;
A radiation image conversion panel comprising:   The radiation image conversion panel according to claim 1, wherein a range of the radius of curvature R is 1 mm to 10 mm.   The radiation image conversion panel according to claim 1, wherein a peripheral edge portion of the substrate is chamfered.   The radiation image conversion panel according to claim 1, wherein a peripheral edge portion of the substrate is coated with a resin tape.   The radiation image conversion panel according to claim 4, wherein a thickness dimension of the resin tape is 0.05 mm or more.   The radiation image conversion panel according to any one of claims 1 to 5, wherein a thickness dimension of the substrate is 0.2 mm to 1 mm.   The radiation image conversion panel according to any one of claims 1 to 6, wherein the substrate is a carbon plate or an aluminum plate.   The protective film is a laminated film formed by laminating two or more kinds of resin film layers as a protective film covering the photostimulable phosphor layer, and at least one layer is a resin film layer on which a metal oxide is deposited. The radiation image conversion panel according to claim 1, wherein the radiation image conversion panel is a radiation image conversion panel.

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