JP2009257914A - Cassette type radiograph detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cassette type radiograph detector, which is a transportable flat panel detector (FPD) having compatibility with a cassette for CR and capable of preventing occurrence of failure due to friction with a flexible cable in a housing. <P>SOLUTION: A cassette type radiograph detector 1 comprises a housing 3 incorporating an image detection unit 2 including a sensor panel 21 equipped with a plurality of photoelectric conversion means 152 formed on a substrate 213 and a scintillator 211 for converting incident radiation into light, a base 24 provided with a circuit 23 related to the photoelectric conversion means 152 on the surface opposite to a surface facing the sensor panel 21, and a flexible cable 26 for connecting the photoelectric conversion means 152 on the sensor panel 21 and the circuit 23 on the base 24, and has a side face 31S facing the flexible cable 26 in the housing 3 and having a curved surface. The inner wall of the side face 31S is formed in surface contact with the flexible cable 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cassette type radiation image detector.

  Conventionally, for the purpose of disease diagnosis and the like, a radiographic image taken using radiation, represented by an X-ray image, has been widely used. Such medical radiographic images were conventionally taken using a screen film, but in recent years, digitization of radiographic images has been realized. For example, a stimulable phosphor layer forms radiation transmitted through a subject. After being stored in the photostimulable phosphor sheet, the photostimulable phosphor sheet is scanned with laser light, and thereby the photostimulated light emitted from the photostimulable phosphor sheet is photoelectrically converted to image data. CR (Computed Radiography) devices for obtaining the above are widely used (see, for example, Patent Documents 1 and 2).

  In radiographic imaging, a cassette (see, for example, Patent Documents 1 and 2) in which a recording medium such as a screen film or a photostimulable phosphor sheet is housed is used. The CR cassette used for photographing with the CR apparatus can continue to use existing equipment such as a cassette holder or a bucky table that has been introduced to be compatible with conventional screen / film cassettes. In this way, the screen / film cassette is designed and manufactured following the JIS standard size. In other words, the cassette size compatibility is maintained, and the facility is effectively utilized and the image data is digitized.

  Recently, as a means for obtaining a medical radiation image, a flat panel detector (hereinafter referred to as “FPD”) is known as a detector that detects irradiated radiation and obtains it as digital image data. (See, for example, Patent Document 3).

  Furthermore, portable imaging devices (cassette type radiation image detectors) in which the FPD is housed in a housing (housing) have come into practical use (see, for example, Patent Documents 4 and 5). Such a cassette-type radiation image detector can be carried, so it can be taken in a patient's room or the like, and can be photographed. Since it is possible to adjust the angle and angle, it is expected to be widely used.

  By the way, as described above, the currently popular CR cassette is sized according to the JIS standard size of the conventional screen / film cassette, and the Bucky table and the like are also made according to the JIS standard size. ing. For this reason, if the cassette-type radiation image detector, which is a portable FPD, can also be used in the form of being accommodated in a cassette according to this JIS standard size, the existing equipment installed in the facility is used. It can be used for photographing, and capital investment when introducing FPD as photographing means can be minimized.

  By the way, in the FPD 100, as shown in FIG. 22, for example, radiation is converted into light by a scintillator 102 provided on the sensor panel 101, and the light is detected by a photoelectric conversion means 103 such as a photodiode to detect a radiation image. However, a circuit 104 for providing a base 104 on the downstream side of the incident direction of radiation of the sensor panel 101 and supplying electric power to the photoelectric conversion means 103 or processing an electric signal output from the photoelectric conversion means 103 is provided. In many cases, it is provided on the surface on the downstream side in the incident direction of the radiation.

At that time, the photoelectric conversion means 103 and the like of the sensor panel 101 and the circuit 105 and the like of the base 104 are a flexible cable (flexible wiring board) such as a COF (Chip On Film) on which an unillustrated integrated circuit element is mounted. And so on.) Are connected. In Patent Document 6, etc., in order to dissipate heat generated by the integrated circuit element, the flexible cable 106 and the integrated circuit element are directly attached to the housing 107 of the FPD 100 as shown in the figure, or a heat conductive material such as grease (not shown) is used. It has been proposed to make contact via.
JP 2005-121783 A JP 2005-114944 A JP-A-9-73144 JP 2002-311527 A US Pat. No. 7,189,972 JP-A-9-288184

  However, as shown in Patent Document 6, when the flexible cable 106 or the like is brought into direct contact with the housing 107 of the FPD 100, when the FPD 100 is made portable as described above, during truck transportation from the factory to the customer, When the FPD 100 vibrates when the patient is transported to the bedside, the flexible cable 106 in the housing 107 resonates, rubs against the housing 107, and the wiring of the flexible cable 106 is disconnected. Arise.

  Further, when the flexible cable 106 is fixed to the housing 107 via a heat conductive material such as grease, the flexible cable 106 tends to move relative to the housing 107 due to resonance with the vibration of the FPD 100. Since force is applied to a portion fixed to the housing 107, the flexible cable 106 is deteriorated.

  Further, if the flexible cable 106 is merely brought into contact with the housing 107 via a heat conductive material such as grease, the heat such as grease is regenerated every time the flexible cable 106 is displaced relative to the housing 107 due to the vibration of the FPD 100. The conductive material spreads on the inner wall of the housing 107, and eventually the flexible cable 106 and the housing 107 are rubbed, resulting in the same problem as described above.

  Thus, when rubbing between the flexible cable 106 and the housing 107 occurs, there is a high possibility that a failure such as cutting of the wiring occurs in the flexible cable 106. Therefore, it is required that the cassette type radiation image detector has a configuration in which the flexible cable 106 and the housing 107 are not rubbed or the like, and even if they occur, a very small amount of rub is required.

  Accordingly, the present invention has been made to solve the above-described problems, and is a portable FPD that is thin and compatible with a cassette for CR, and that is compatible with a housing for a flexible cable. An object of the present invention is to provide a cassette type radiation image detector capable of preventing the occurrence of a failure due to rubbing or the like.

In order to achieve the above object, the present invention provides:
A sensor panel comprising a plurality of photoelectric conversion means formed on a substrate, and a scintillator provided opposite to the photoelectric conversion means for converting incident radiation into light;
A base on which a circuit related to the photoelectric conversion means is provided on the surface opposite to the surface facing the sensor panel;
A flexible cable connecting the photoelectric conversion means on the sensor panel and the circuit on the base;
An image detection unit with a built-in housing,
A cassette-type radiation image detection, wherein a side surface portion of the housing facing the flexible cable is formed in a curved shape, and an inner wall portion of the side surface portion is formed in surface contact with the flexible cable. It is a vessel.

  According to the cassette type radiographic image detector of the present invention, the thickness of the housing in the radiation incident direction is, for example, 16 mm or less, so that it is within the range of the JIS standard size in the conventional screen / film cassette. Since the size is within the range, existing devices and equipment such as a bucky table provided for a cassette for CR can be used even when imaging is performed with a portable radiation solid-state detector which is a cassette-type FPD.

  In addition, even when the cassette-type radiation image detector vibrates, the movement of the flexible cable which resonates and moves in the radiation incident direction is formed into a curved surface having substantially the same curvature as that of the flexible cable. The side part of the main body part of the housing and the flexible cable do not move relatively (is not displaced) by being blocked by the upper part and the lower part that curve inward in the side part. Therefore, there is no friction between the side portion and the flexible cable, or even if rubbing occurs, only a very small amount of friction is required. It is possible to accurately prevent the occurrence.

  Hereinafter, embodiments of a cassette type radiation image detector according to the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

  FIG. 1 is a perspective view of a cassette type radiation image detector (hereinafter referred to as “cassette type detector”) in the present embodiment. The cassette type detector 1 in this embodiment is a cassette type FPD, and the cassette type detector 1 detects an irradiated radiation and acquires it as digital image data (see FIG. 14 and the like), And a housing 3 containing the image detection unit 2.

  In the present embodiment, the housing 3 is formed so that its thickness in the radiation incident direction is 16 mm or less. Although the thickness dimension of the housing 3 in the radiation incident direction is not limited to 16 mm or less, it should be within a range (15 mm + 1 mm to 15 mm-2 mm) in accordance with JIS Z 4905 in a conventional screen / film cassette. Is preferred.

  Since most existing devices such as CR cassettes and Bucky tables are made to match the JIS standard size of this screen / film cassette, the cassette type can be obtained by adjusting the dimensions of the housing 3 to the JIS standard size. Even when photographing with the cassette type detector 1 which is the FPD, existing equipment can be used. The international standard corresponding to JIS Z 4905 is IEC 60406.

  FIG. 2 is an exploded perspective view of the housing 3 in the present embodiment. As shown in FIG. 2, the housing 3 covers and closes the housing main body 31 formed in a hollow cylindrical shape having openings 311 and 312 at both ends, and the openings 311 and 312 of the housing main body 31. The first lid member 32 and the second lid member 33 are provided.

  In the present embodiment, the first lid member 32 and the second lid member 33 are provided with lid body portions 321 and 331 and insertion portions 322 and 332, for example, non-conductive such as non-conductive plastic. It is made of material.

  The lid main body portions 321 and 331 are formed so that the outer circumference thereof is substantially the same as the outer circumference of each of the openings 311 and 312 of the housing main body portion 31. Moreover, the dimension in the insertion direction with respect to the opening parts 311 and 312 of the cover main-body parts 321 and 331 is 8 mm in this embodiment. In addition, although it does not specifically limit how much the said dimension of the lid | cover main-body parts 321 and 331 is made, It is preferable that the said dimension shall be 6 mm or more about the lid | cover main-body part 321 provided with the antenna device 9 mentioned later. 8 mm or more is more preferable.

  Further, the insertion portions 322 and 332 have a frame shape having an opening on the insertion side with respect to the openings 311 and 312, and the outer periphery of the insertion portions 322 and 332 is formed by the openings 311 and 312 of the housing main body 31. It is formed to have a dimension slightly smaller than the dimension of the inner periphery.

  Inside the insertion portions 322 and 332, buffer members 323 and 333 (see FIG. 14 and the like) that can relieve external force transmitted from the outside to the image detection portion 2 are provided. The buffer members 323 and 333 are not particularly limited as long as the external force can be reduced. For example, foamed urethane, silicon, or the like can be applied.

  In particular, as shown in FIG. 3A, the buffer member 333 provided in the insertion portion 332 is guided to the horizontal position at the end of the image detection unit 2 along the inclination of the end of the buffer member 333. Thus, the cross-sectional shape is substantially V-shaped. In addition, if the buffer member 333 is formed of a deformable material such as an elastic body, a viscous body, a viscoelastic body (viscoelastic) or the like, as shown in FIGS. When the lid member 33 is pushed into the housing body 31, the shape of the buffer member 333 is deformed according to the shape of the end of the image detection unit 2, and the end of the image detection unit 2 is held by the buffer member 333. . Thus, the buffer member 333 also functions as a holding member that holds the image detection unit 2 at an appropriate position inside the housing 3.

  As shown in FIG. 2, from each side of the insertion portions 322 and 332, engagement pieces 324 and 334 as engagement means for engaging the housing main body portion 31 and the lid members 32 and 33 are opened portions 311, It extends in the insertion direction with respect to 312. Engagement projections 325 and 335 are provided on the outer surfaces of the engagement pieces 324 and 334, respectively.

  In addition, it is preferable that a waterproof ring (not shown) formed of rubber or the like is provided on the outer peripheral surfaces of the insertion portions 322 and 332. In the case where a waterproof ring is provided, the adhesion between the housing body 31 and the lid members 32 and 33 is increased, and moisture and foreign matter such as dust, patient sweat, and disinfectant enter into the housing 3. Can be prevented.

  On one side of the lid main body portion 321 of the first lid member 32 and perpendicular to the radiation incident surface X of the cassette type detector 1 (see FIG. 1), the cassette type detector 1 and external devices are arranged. An antenna device 9 is embedded for wirelessly transmitting and receiving information.

  The antenna device 9 includes a pair of flat radiation plates 91 and 92 made of metal, and a power feeding unit 93 that connects the pair of radiation plates 91 and 92 and supplies power to the pair of radiation plates 91 and 92. Is provided. In the present embodiment, of the pair of radiation plates 91 and 92, one radiation plate 91 is formed so that the shape in front view is a trapezoid, and the other radiation plate 92 has a substantially circular shape in front view. It is formed to become.

  The power feeding unit 93 is connected to the approximate center of the upper bottom portion of one radiation plate 91 and is connected to a part of the other radiation plate 92. A predetermined gap is formed between the pair of radiation plates 91 and 92 by being connected by the power supply unit 93.

  Note that the type and shape of the antenna device 9 are not limited to those illustrated here. The antenna device 9 is not limited to the case where it is embedded in the lid main body portion 321, and may be attached to the outside or the inside of the lid main body portion 321. However, since the antenna device 9 is provided at a position close to a conductive member made of a conductive material such as metal or carbon, the reception sensitivity and the reception gain are lowered. Therefore, the housing formed of a conductive material such as carbon is used. It is preferable to be provided as far as possible from the main body 31 and various electronic components 22 formed of metal or the like (see FIG. 14 and the like), preferably at least 6 mm or more, more preferably 8 mm or more. .

  In this respect, in this embodiment, as described above, the antenna device 9 is provided in the lid main body portion 321 formed of a non-conductive material, and the dimension of the lid main body portion 321 in the insertion direction with respect to the opening 311 is as follows. 8 mm. For this reason, the antenna device 9 is disposed at a position 8 mm away from the housing main body 31 formed by including a conductive material such as carbon fiber, which is preferable for maintaining reception sensitivity and reception gain.

  Further, on one surface of the lid main body portion 321 and the same surface as the surface on which the antenna device 9 is formed, as shown in FIGS. 1 and 2, the rechargeable battery 25 ( A charging terminal 45 that is connected to an external power source or the like when charging (see FIG. 14 etc.) is formed, and a power switch 46 that switches ON / OFF of the power source of the cassette type detector 1 is disposed. Yes. Furthermore, an indicator 47 formed of, for example, an LED or the like and displaying the charging status of the rechargeable battery 25 and various operation statuses is provided at the corner formed by the surface where the antenna device 9 is formed and the radiation incident surface X. Is provided.

  In the present embodiment, the case where the antenna device 9 and the charging terminal 45 are all provided in the first lid member 32 is illustrated, but all or part of them is the second lid member 33. It is good also as a structure provided in etc. Further, the interface parts such as the antenna device 9 and the charging terminal 45 are not limited to those exemplified here, and other parts may be included, or a part of them may not be provided. Also good.

  The housing main body 31 is formed using a plate-like carbon fiber. In the present embodiment, for example, one plate-like carbon fiber 31A having a thickness of 1 mm to 2 mm as shown in FIG. 4A is disposed around a mold (not shown), and a side surface portion 31S as shown in FIG. 4B. Is folded into a curved surface, baked and hardened at high temperature and high pressure, and both end portions 31p and 31q in the longitudinal direction are joined together to form a hollow cylindrical housing body having openings 311 and 312 at both ends. 31 is formed.

  In the present embodiment, both end portions 31p and 31q in the longitudinal direction of the plate-like carbon fiber 31A are portions of a surface Y (hereinafter referred to as a back plate Y) opposite to the radiation incident surface X of the housing main body 31. It comes to be joined with. That is, the housing main body 31 is formed by folding the plate-like carbon fibers 31A and joining both end portions 31p and 31q in the longitudinal direction S at the position of the back plate Y.

  4A and 4B, both end portions 31p and 31q in the longitudinal direction S of the plate-like carbon fiber 31A are cut perpendicularly to the longitudinal direction S, and both end portions 31p and 31q The case where the joining portion is configured to extend perpendicularly to the longitudinal direction S in the back plate Y has been described, but the cutting direction of both end portions 31p and 31q in the longitudinal direction of the plate-like carbon fiber 31A is long. It is not limited to the case where it is perpendicular to the scale direction S.

  When the cutting directions of both end portions 31p and 31q are not perpendicular to the longitudinal direction S, the back plate Y of the housing body 31 shown in FIG. Although extending in an oblique direction with respect to the scale direction S, no problem occurs.

  Further, in the back plate Y, at least the outer surface portions of the joining portions of both end portions 31p and 31q in the longitudinal direction of the plate-like carbon fibers 31A are removed so that the unevenness generated during joining is removed and the surface becomes smooth. It is processed.

  In addition, although illustration is abbreviate | omitted, the housing main-body part 31 arrange | positions the shape, for example after winding a fibrous carbon fiber on a core material (form | mold) and making it desired thickness, such as 1 mm-2 mm, and winding. It can also be formed by pouring a thermosetting resin on the rotated carbon fiber, molding by baking at high temperature and high pressure, and then extracting the core material. Also in this case, both end portions of the fibrous carbon fiber are formed so as to be positioned on the back plate Y portion of the formed housing main body 31.

  As shown in FIG. 1, FIG. 2, and FIG. 4B, the housing main body 31 is formed in a curved surface so that the side surface 31 </ b> S has a circular arc shape in the present embodiment.

  Pitch-based carbon fibers are preferably used as the carbon fibers forming the housing body 31. FIG. 5 is a table comparing the elastic modulus and thermal conductivity of various materials. As the carbon fiber, there are a PAN-based carbon fiber and a pitch-based carbon fiber. As shown in FIG. 5, the pitch-based carbon fiber has a modulus of elasticity three times that of the PAN-based carbon fiber. Even if the thickness of the main body 31 is reduced, sufficient strength can be obtained. In addition, carbon fibers generally have a lower thermal conductivity than metals such as aluminum, and when heat is generated in a housing formed of carbon fibers, there is a problem that the heat is burned without being dissipated.

  In this respect, since the pitch-based carbon fiber has a high thermal conductivity similar to that of aluminum, the generated heat is generated even when the housing 3 includes a plurality of heat generating components such as various electronic components 22 and rechargeable batteries 25 described later. It is possible to efficiently dissipate the heat, and it is possible to prevent the heat inside the housing 3 from adversely affecting each part.

  As shown in FIG. 2 and FIG. 14, inside the side surface portion 31 </ b> S of the housing main body portion 31, at positions corresponding to the engaging convex portions 325 and 335 of the engaging pieces 324 and 334 of the lid members 32 and 33. In addition, engagement recesses 315 and 316 that engage with the engagement projections 325 and 335 are formed.

  In the housing 3, the insertion portion 322 of the first lid member 32 is inserted into the opening 311 at one end portion of the housing body 31, and the insertion portion of the second lid member 33 is inserted into the opening portion 312 at the other end portion. By inserting 332 and engaging the engaging convex portions 325 and 335 with the engaging concave portions 315 and 316, respectively, both the opening portions 311 and 312 are closed, and the inside is sealed and integrated. ing. The means for joining the housing body 31 and the lid members 32 and 33 is not limited to those exemplified here, and may be joined by, for example, screwing or may be bonded and fixed.

  In the present embodiment, the first lid member 32 and the second lid member 33 are fixed to the housing main body 31 and cannot be removed after once assembled. By comprising in this way, the airtightness inside the housing 3 can be improved.

  For this reason, for example, when it is necessary to replace the rechargeable battery 25, the lid members 32 and 33 are destroyed and the cassette type detector 1 is disassembled. However, the lid member formed of resin or the like 32 and 33 are relatively inexpensive, and even if destroyed, there is little loss. On the other hand, the internal image detection unit 2 can be taken out in a reusable manner.

  In order to prevent the influence of an external load (such as the patient's weight) from being exerted on the image detection unit 2 housed in the housing 3, the deflection amount of the cassette type detector 1 as a whole is determined by the image detection unit 2. It is necessary to regulate so that it is within the allowable deflection amount.

  In order to prevent the influence of an external load (such as the patient's weight) from being exerted on the image detection unit 2 housed in the housing 3, the deflection amount of the cassette type detector 1 as a whole is determined by the image detection unit 2. It is necessary to regulate so that it is within the allowable deflection amount.

  Here, the maximum deflection amount of the housing 3 of the cassette type detector 1 assumed at the time of actual patient imaging and the stress acting on the glass substrates 213 and 214 constituting the image detection unit 2 will be described with reference to data. FIG. 6 shows the result of a simulation of the amount of deflection of the housing 3 of the cassette type detector 1.

  In this simulation, the housing main body 31 uses a pitch-based carbon fiber having a tensile elastic modulus of 790 Gpa as the carbon fiber, the housing 3 has a thickness of 16 mm in the radiation incident direction, and the housing main body 31 has a thickness of 2 mm. A cassette type detector 1 was used. Further, as the size, a half-cut size (size of 14 inches × 17 inches) which is most likely to bend was used.

  The load applied to the cassette-type detector 1 varies depending on the imaging posture. However, the imaging posture in which the largest load is assumed in the assumed use environment is that the patient lies sideways on the bed, Since the cassette-type detector 1 is disposed below (see FIG. 8), the simulation shown in FIG. 6 moves the cassette-type detector 1 disposed under the patient in such an imaging posture. It is about the case to let you.

  In FIG. 6, as shown in FIG. 7 (a), the pattern 1 is a cassette type detector 1 in which only one end of the cassette type detector 1 is held in a cantilever manner and a load is applied from above. Is the maximum amount of deflection of the cassette type detector 1 when moving. For example, it is assumed that the cassette type detector 1 is once set under the buttocks of a patient lying on the bed and the detector is moved by one person to change this position.

  As shown in FIG. 7B, the pattern 2 holds two end portions located diagonally and moves the cassette-type detector 1 in a loaded state in the same manner as the pattern 1. This is the maximum amount of deflection of the cassette type detector 1. This assumes, for example, the case where the detector is moved by two people.

  The actual measurement result that the maximum load applied to the housing 3 of the cassette type detector 1 when moving the cassette type detector 1 inserted under the patient lying on the bed was about 30 kg was obtained. For both Pattern 1 and Pattern 2, the amount of deflection in a state where a load of 30 kg was applied to the end holding the cassette type detector 1 was measured.

  As a result, as shown in FIG. 6, in any case, the maximum deflection amount of the housing 3 of the cassette type detector 1 can be less than 2 mm.

  8 shows the glass substrates 213 and 214 (FIGS. 15 and 16) of the image detection unit 2 when the cassette type detector 1 is mounted on a relatively high rigidity such as a bucky table. FIG. 9 shows the result of measurement using a pressure measuring device 7 (see FIG. 9).

  For example, as shown in FIG. 9, the pressure measuring device 7 converts a change in pressure applied from the outside into an electric signal by a pressure-sensitive element and outputs the electric signal, and an electric signal output from the sensor sheet 71 as a sensor. The computer 73 which receives via the connector 72 is provided, Specifically, it measured using the Nita Corporation I-SCAN system.

  When the patient is lying on his back and the cassette-type detector 1 is placed under the buttocks and when the cassette-type detector 1 is placed under the back, the patient is lying sideways. When the cassette-type detector 1 is placed under the buttock and the cassette-type detector 1 is placed under the shoulder, four types of imaging postures and combinations of imaging parts are used. The sensor sheet 71 of the measuring device 7 was placed under the imaging region of the patient, and the pressure applied to the housing 3 of the cassette type detector 1 was measured.

  As described above, the imaging posture in which the load applied to the cassette type detector 1 is the largest is when the patient lies sideways on the bed and the cassette type detector 1 is placed under the buttock. For example, when imaging a patient weighing 100 kg in such an imaging posture, the maximum load acting on the glass substrates 213 and 214 of the image detection unit 2 of the cassette type detector 1 is 11 kg as shown in FIG. Before and after.

  Further, the amount of deflection (distortion amount) of the housing 3 that occurs when the cassette type detector 1 is held and moved in a cantilever manner as described above is 2 mm or less, while the allowable amount of deflection of the image detection unit 2. Is 6 mm. Therefore, even when the cassette-type detector 1 set under the patient is moved, the position is changed, etc., when the entire weight of the patient is taken on the housing 3, the glass substrate 213 is moved. , 214 does not exceed the allowable stress of the glass substrates 213, 214, and a failure such as cracking of the glass substrates 213, 214 is not induced.

  That is, as shown in FIG. 10, in the case of a glass plate (glass substrate) of 8 mm or less, the allowable stress (short-term allowable stress) against the instantaneous force acting when moving the cassette type detector 1 is glass. 24.5 MPa in the plane of the substrate. Then, when an equally distributed load is applied in a state where the four sides of the rectangular plate-like member are supported like the glass substrates 213 and 214, as shown in FIG. 11, the maximum stress is 23 MPa, and the maximum deflection amount is 6 mm.

Note that the maximum stress in FIG. 11 is the side length ratio when the longitudinal direction of a rectangular plate-like member supported on four sides is b and the direction orthogonal to the longitudinal direction is a, as shown in FIG. Coefficients α ₁ and β ₁ when b / a is 1.2 are determined (see FIG. 13), calculated by Equation (1), and the maximum deflection amount is obtained by Equation (2) under the same conditions. Calculated.

  As described above, the maximum stress generated when the maximum load that can be assumed in using the cassette type detector 1 is applied is 23 MPa, and the maximum deflection is 6 mm. Like 213 and 214, the allowable stress in the case of a glass plate (glass substrate) of 8 mm or less is 24.5 MPa, and the deflection amount within 6 mm is allowed. Therefore, it can be said that no failure such as cracking occurs in the glass substrates 213 and 214 and the image detection unit 2 including the same in any shooting posture.

  14 is a plan view of the state in which the image detection unit 2 is housed in the housing 3 as viewed from the lower side (the side opposite to the radiation incident side during imaging), and FIG. 15 is a cross-sectional view taken along line AA in FIG. 16 and 16 are cross-sectional views taken along line BB in FIG. In FIG. 14, the state inside the housing 3 is shown without the back plate Y of the housing body 31 for the convenience of explanation.

  As shown in FIGS. 14 to 16, the image detection unit 2 includes a circuit board 23 on which a sensor panel 21 and various electronic components 22 are mounted and a circuit related to a photodiode 152 as a photoelectric conversion unit described later is provided. It is configured with. In the present embodiment, the circuit board 23 is fixed to a surface of the base 24 made of resin or the like on the side opposite to the surface facing the sensor panel 21.

  Further, in the present embodiment, a thin lead plate 24a (thickness is, for example, 0.1 mm) between the second glass substrate 213 and the base 24 so that the electronic components 22 and the like of the circuit board 23 are not irradiated with radiation. Degree) is provided. Further, a buffer member may be provided between the circuit board 23, the electronic component 22, the base 24, and the like and the back plate Y of the housing main body 31.

  As shown in FIG. 14, in this embodiment, the circuit board 23 on which the electronic component 22 is mounted is divided into four parts, which are arranged close to the corners of the sensor panel 21 and the base 24, respectively. . The electronic component 22 is arranged on the circuit board 23 along the outer periphery of the sensor panel 21. The electronic component 22 is preferably arranged at a position as close to each corner of the sensor panel 21 as possible.

  By arranging the electronic component 22 on the circuit board 23 in this way, the external force applied to the electronic component 22 near the corner of the housing 3 and the peripheral portion of the housing main body 31 when the image detection unit 2 is housed in the housing 3. Are arranged along a region that is difficult to deform (high strength). In addition, the number, arrangement | positioning, etc. of the circuit board 23 and the electronic component 22 are not limited to what was illustrated here.

  In the present embodiment, as the electronic component 22 arranged on the circuit board 23, for example, a CPU (central processing unit) or a ROM (read only memory) constituting a control unit 27 (see FIG. 21) that controls each unit. , A storage unit (not shown) including a RAM (Random Access Memory), a scanning drive circuit 16 (see FIG. 21), a signal readout circuit 17 (see FIG. 21), and the like. In addition to the ROM and RAM, an image storage unit that includes a rewritable read-only memory such as a flash memory or the like and that stores an image signal output from the sensor panel 21 may be provided.

  The image detection unit 2 is provided with a communication unit (not shown) that transmits and receives various signals to and from an external device. For example, the communication unit transfers the image signal output from the sensor panel 21 to the external device via the antenna device 9 described above, and receives the imaging start signal transmitted from the external device via the antenna device 9. It is like that.

  Further, a cassette type detection is provided on the base 24 at a position near the charging terminal 45 provided on the first lid member 32 when the image detection unit 2 is housed in the housing 3. A plurality of drive units (for example, a scan drive circuit 16 (see FIG. 21) described later), a signal readout circuit 17 (see FIG. 21), a communication unit, a storage unit, a charge amount detection unit (not shown), an indicator 47, A rechargeable battery 25 is provided as a power supply unit that supplies power to the sensor panel 21 or the like.

  As the rechargeable battery 25, for example, a rechargeable battery such as a nickel cadmium battery, a nickel metal hydride battery, a lithium ion battery, a small sealed lead battery, or a lead storage battery can be used. Further, a fuel cell or the like may be applied instead of the rechargeable battery 25. Note that the shape, size, number, arrangement, and the like of the rechargeable battery 25 as the power supply unit are not limited to those illustrated in FIG.

  The rechargeable battery 25 is electrically connected to the aforementioned charging terminal 45 by being installed at a predetermined position on the base 24. For example, the cassette type detector 1 is connected to an external power source. By attaching to a charging device (not shown) such as a cradle, the terminal on the charging device side and the charging terminal 45 on the housing 3 side are connected and the rechargeable battery 25 is charged.

  A flexible harness (not shown) made of a flexible material is provided at the end of the circuit board 23 connected to the various electronic components 22 and the rechargeable battery 25. The circuit board 23 and the like are electrically connected to the charging terminal 45, the power switch 46, the indicator 47, and the antenna device 9 provided on the first lid member 32 by this flexible harness. Note that the method of connecting the flexible harness to the charging terminal 45 of the first lid member 32 may be a connector or may be soldered.

  Further, as shown in FIG. 15, the side surface portion 31S of the housing main body portion 31 is formed in a curved shape so as to have a circular arc shape in the present embodiment. In addition, a buffer member 317 that holds the image detection unit 2 so that the image detection unit 2 does not move in the housing main body unit 31 is provided on a part of the side surface portion 31S of the housing main body unit 31. The detection unit 2 is attached to the side surface 31S of the housing main body 31 via the buffer member 317.

  The material of the buffer member 317 is not particularly limited, and for example, an elastic resin such as silicon or polyurethane can be applied. FIG. 14 shows the case where the buffer member 317 is provided at the inner end of the side surface portion 31S of the housing main body portion 31 in the vicinity of the first lid member 32 and the second lid member 33. In addition, for example, it may be configured to be provided at an intermediate portion between the first lid member 32 and the second lid member 33, that is, at an intermediate position in the vertical direction in FIG.

  As will be described later, a plurality of photodiodes 152 as photoelectric conversion means are provided on the surface of the second glass substrate 213 of the sensor panel 21 on the scintillator layer 211 side. As shown in FIGS. 14 and 16, the circuit board 23 on the base 24 provided with related circuits is connected by a flexible cable 26.

  As shown in FIG. 16, the flexible cable 26 is curved so as to have substantially the same curvature as the curvature of the inner wall portion of the side surface portion 31 </ b> S formed in a curved shape so as to have a circular arc shape of the housing main body portion 31. Are connected to the photodiode 152 and the like on the second glass substrate 213 and the circuit board 23 on the base 24, and the side surface portion 31 </ b> S formed in a curved surface so as to have a circular arc shape of the housing main body portion 31. It is provided so as to be in surface contact with the inner wall portion of the. The flexible cable 26 does not need to be pressed against the inner wall portion of the side surface portion 31S of the housing main body 31, but is provided so as to come into surface contact with the inner wall portion of the side surface portion 31S.

  The flexible cable 26 may be configured by a flexible wiring board such as a COF on which an integrated circuit element or the like is mounted, or may be configured by a flexible harness or the like. A cable made of a certain material is appropriately used. In the present embodiment, a heat conductive material such as grease is not interposed between the inner wall portion of the side surface portion 31S of the housing main body portion 31 and the flexible cable 26, but a heat conductive material is interposed. It is also possible to configure.

  17 is a plan view of the sensor panel 21, FIG. 18 is a side view of the sensor panel 21 viewed from the direction of arrow F in FIG. 17, and FIG. It is sectional drawing.

  The sensor panel 21 includes a first glass substrate 214 having a scintillator layer (light emitting layer) 211 formed on one surface as a scintillator that converts incident radiation into light, and is laminated below the scintillator layer 211. A signal detector 151 (see FIG. 21) that detects the converted light and converts it into an electrical signal is configured to include a second glass substrate 213 formed on one surface, and these are laminated. It has a laminated structure.

  The scintillator layer 211 has, for example, a phosphor as a main component and outputs an electromagnetic wave having a wavelength of 300 nm to 800 nm, that is, an electromagnetic wave (light) ranging from ultraviolet light to infrared light centering on visible light, based on incident radiation. It is like that.

The phosphor used in the scintillator layer 211 is, for example, a material using CaWO ₄ or the like as a base material, or a luminescent center substance in a base material such as CsI: Tl, Cd ₂ O ₂ S: Tb, or ZnS: Ag. An activated material can be used. Further, when the rare earth element is M, a phosphor represented by a general formula of (Gd, M, Eu) ₂ O ₃ can be used. In particular, CsI: Tl and Cd ₂ O ₂ S: Tb are preferable because of high radiation absorption and light emission efficiency. By using these, high-quality images with low noise can be obtained.

  The scintillator layer 211 is formed, for example, in the form of a phosphor layered on a support (not shown) formed of various polymer materials (polymers) such as a cellulose acetate film, a polyester film, and a polyethylene terephthalate film by, for example, a vapor deposition method. The phosphor layer is made of a columnar crystal of the phosphor. As the vapor deposition method, a vapor deposition method, a sputtering method, a chemical vapor deposition (CVD) method or the like is preferably used. In any of the methods, the phosphor layer can be vapor-grown into independent elongated columnar crystals on the support.

  The scintillator layer 211 is affixed to the lower side of the first glass substrate 214 (the side opposite to the side on which radiation is incident during imaging), and the upper side of the first glass substrate 214 (the side on which radiation is incident during imaging). A glass protective film 215 is further laminated. A second glass substrate 213 is laminated below the scintillator layer 211 (the side opposite to the side on which radiation is incident during imaging), and a glass protective film is disposed below the second glass substrate 213. 216 is further laminated.

  Both the first glass substrate 214 and the second glass substrate 213 have a thickness of about 0.6 mm. Note that the thickness of the first glass substrate 214 and the second glass substrate 213 is not limited to 0.6 mm. Further, the first glass substrate 214 and the second glass substrate 213 may have different thicknesses.

  In addition, the first glass substrate 214 and the second glass substrate 213 (see FIG. 18 and the like) are cut at the end surfaces with a laser, so that the end surfaces, that is, the cut surfaces, and the cut surfaces and the upper surfaces of the glass substrates are separated. The ridge line portion and the ridge line portion between the cut surface and the lower surface of the glass substrate are smoothed.

  Here, the smoothing process by cutting the end surfaces of the first glass substrate 214 and the second glass substrate 213 with a laser will be described.

  When cutting glass, first, streaks (scratches) are formed on the glass surface to form vertical cracks in the thickness direction of the glass (scribing work), and stress is applied to break up the cracks. It is common to go through two work processes called (work). Conventionally, the work of scuffing the glass surface (scribing work) has been performed using cemented carbide, electrodeposited diamond, sintered diamond, or the like. However, when the glass surface is scratched with cemented carbide or diamond, fine irregularities are formed on the cut (divided) glass end face, and this irregularity part is applied when a load such as bending is applied to the glass. Since stress concentrates on the surface, there is a problem that it is easy to break.

  In this regard, in the present embodiment, a work (scribing work) for scratching the surfaces of the first glass substrate 214 and the second glass substrate 213 using a laser is performed. When the laser is used in this way, the end face of the glass after cutting (dividing) is smoothed, so that the strength of the glass against a load such as bending can be increased.

  Rather than the magnitude of the external force, the glass substrate cracks are caused by the formation of partial burrs and partial convexities that cause stress concentration when the glass substrate is cut. Thus, by performing the process of smoothing the end face after cutting, it is possible to prevent the occurrence of cracking of the glass substrate even for a considerable external force (stress).

  As a cutting device for cutting the end surfaces of the first glass substrate 214 and the second glass substrate 213 with a laser, for example, in a laser oscillation unit, YAG (Yttrium Aluminum Garnet yttrium aluminum garnet crystal) is used as a laser optical medium. A YAG laser or the like to be used is preferably used, but the cutting device used for cutting is not limited to this.

  The electromagnetic wave (light) output from the scintillator layer 211 is converted into electric energy and accumulated on the upper side of the second glass substrate 213 (the side facing the scintillator layer 211 described above), and is based on the accumulated electric energy. A signal detector 151 (see FIG. 21), which is a detector that outputs an image signal, is formed.

  As described above, in the present embodiment, the signal detection unit 151 is stacked on the lower side of the scintillator layer 211, the second glass substrate 213 disposed on the lower side of the signal detection unit 151, and the scintillator layer 211. The signal detection unit 151 and the scintillator layer 211 are sandwiched between the first glass substrate 214 disposed on the upper side of the first glass substrate 214.

  Conventionally, it was thought that cracking of the glass substrate could not be prevented unless the stress acting on the internal glass substrate through the housing was suppressed. Therefore, as described above, a space was provided between the housing and the glass substrate. A large number of cushioning members that relieve / reduce the external force were used in the space. For this reason, the housing is further increased in size.

  In this regard, the present inventors have found that the cracks in the glass substrate are not the magnitude of the external force acting on the glass substrate, but rather the partial burrs that cause stress concentration when cutting the glass substrate, It has been found that this is due to the formation of convex and concave portions. Therefore, in order to remove the burrs and the convex and concave portions that cause the stress concentration, a process of smoothing the end face after cutting is performed, and thereby the patient acting on the housing 3 having the above-described configuration is processed. It has become possible to prevent the occurrence of cracks and the like of the glass substrates 213 and 214 with respect to loads and deflections caused by weight and the like.

  Further, a sealing member 217 is provided along the outer peripheral edge of the first glass substrate 214 and the second glass substrate 213, and the first glass substrate 214 and the second glass substrate are provided by the sealing member 217. 213 is bonded and bonded. Thereby, intensity | strength can be raised more with respect to loads, such as a bending.

  Further, when the first glass substrate 214 and the second glass substrate 213 are bonded together, the first glass substrate 214 and the second glass substrate 213 are deaerated by, for example, sucking air from the space between the first glass substrate 214 and the second glass substrate 213. Adhesion and bonding by the sealing member 217 are performed later, thereby preventing moisture contained in the air from affecting the scintillator layer 211 and the like, and extending the life of the scintillator layer 211 and the like. Can be planned.

  Further, a buffer member 218 for protecting the sensor panel 21 from an external impact or the like is provided in each corner of the sensor panel 21 and in the vicinity of the middle between the corners.

  Here, the circuit configuration of the sensor panel 21 will be described. FIG. 20 is an equivalent circuit diagram of a photoelectric conversion unit for one pixel constituting the signal detection unit 151.

  As shown in FIG. 20, the configuration of the photoelectric conversion unit for one pixel includes a photodiode 152 as photoelectric conversion means, and a thin film transistor (hereinafter referred to as “TFT”) that extracts electric energy accumulated in the photodiode 152 as an electric signal by switching. 153). The photodiode 152 is an image sensor that generates and accumulates charges. The electrical signal taken out from the photodiode 152 is amplified by an amplifier 154 to a level that can be detected by the signal readout circuit 17.

  Specifically, when light is irradiated, a charge is generated in the photodiode 152, and when a signal reading voltage is applied to the gate G of the TFT 153, the charge is transferred from the photodiode 152 connected to the source S of the TFT 153. It flows to the drain D side of the TFT 153 and is stored in a capacitor 154 a connected in parallel to the amplifier 154. The amplifier 154 outputs an electric signal amplified in proportion to the electric charge accumulated in the capacitor 154a.

  When the amplified electrical signal is output from the amplifier 154 and the electrical signal is extracted, the switch 154b connected in parallel to the amplifier 154 and the capacitor 154a is turned on, and the charge accumulated in the capacitor 154a is released. The amplifier 154 is reset. The photodiode 152 may simply be a photodiode having a regulation capacitance, or may include an additional capacitor in parallel so as to improve the dynamic range of the photodiode 152 and the photoelectric conversion unit.

  FIG. 21 is an equivalent circuit diagram in which such photoelectric conversion units are two-dimensionally arranged, and between the pixels, the scanning lines Ll and the signal lines Lr are arranged to be orthogonal to each other. One end side of the photodiode 152 is connected to the source S of the TFT 153, and the drain D of the TFT 153 is connected to the signal line Lr. On the other hand, the other end side of the photodiode 152 is connected to the other end side of the adjacent photodiode 152 arranged in each row, and is connected to a bias power source 155 through a common bias line Lb.

  The bias power source 155 is connected to the control unit 27 so that a voltage is applied to the photodiode 152 through the bias line Lb according to an instruction from the control unit 27. The gates G of the TFTs 153 arranged in each row are connected to a common scanning line Ll, and the scanning line Ll is connected to the control unit 27 via the scanning drive circuit 16. Similarly, the drain D of the TFT 153 arranged in each column is connected to a signal readout circuit 17 connected to a common signal line Lr and controlled by the control unit 27.

  The signal readout circuit 17 is provided with the amplifier 154 for each signal line Lr described above. At the time of signal reading, a signal reading voltage is applied to the selected scanning line Ll, whereby a voltage is applied to the gate G of each TFT 153 connected to the scanning line Ll, and each photodiode is connected via each TFT 153. The charge generated in the photodiode 152 flows from the signal line 152 to each signal line Lr. Then, each amplifier 154 amplifies the charge for each photodiode 152, and information of the photodiode 152 for one row is extracted. This operation is performed for all the scanning lines Ll by switching the scanning lines Ll, whereby information is extracted from all the photodiodes 152.

  A sample hold circuit 156 is connected to each amplifier 154. Each sample and hold circuit 156 is connected to an analog multiplexer 157 provided in the signal readout circuit 17, and the signal read out by the signal readout circuit 17 is described above from the analog multiplexer 157 via the A / D converter 158. It is output to the control unit 27.

  Note that the TFT 153 may be either an inorganic semiconductor type used in a liquid crystal display or the like, or an organic semiconductor type. In the present embodiment, the case where the photodiode 152 is used as the photoelectric conversion unit is illustrated, but a solid-state imaging device other than the photodiode may be used as the photoelectric conversion element.

  On the side of the signal detector 151, a scanning drive circuit 16 that sends a pulse to each photodiode (photoelectric conversion means) 152 to scan and drive each photodiode 152, and the electric power stored in each photoelectric conversion means. A signal readout circuit 17 for reading out energy is arranged.

  Next, the operation of the cassette type detector 1 in the present embodiment will be described.

  In the present embodiment, the image detection unit 2 (see FIGS. 15 and 16, etc.) includes a sensor panel 21 provided with a scintillator layer 211 and a photodiode 152 as a photoelectric conversion means, a circuit board 23 and the like formed thereon. The base 24 is fixed, and the photodiode 152 and the circuit board 23 are connected by the flexible cable 26 as shown in FIGS. 14 and 16.

  The image detection unit 2 formed in this way is inserted into the housing main body 31 from the opening 311 or the opening 312 and is buffered so as to be held by the buffer member 317 as shown in FIG. It is attached to the side surface portion 31S of the housing body 31 via the member 317. Therefore, the image detection unit 2 is held at an appropriate position inside the housing 3.

  Further, when the first lid member 32 and the second lid member 33 are attached to the openings 311 and 312 of the housing main body 31 and the openings 311 and 312 are closed, the image detection unit 2 is configured as shown in FIG. As shown to (a)-(c), the edge part is by the buffer member 323,333 provided in each lid body part 321,331 of the 1st cover member 32 and the 2nd cover member 33, They are held in the same way, and are held in a proper position inside the housing 3 by them. Needless to say, the buffer member 317 and the buffer members 323 and 333 alleviate the external force transmitted to the image detection unit 2 from the outside.

  As described above, the image detection unit 2 is held in an appropriate position inside the housing main body 31 by the buffer member 317 and the buffer members 323 and 333, so that the image detection unit 2 moves in the housing main body 31. Is accurately prevented.

  Further, when the image detection unit 2 is held inside the housing 3 in this way, the flexible cable 26 is connected to the inner wall of the side surface portion 31S formed in the curved shape of the housing main body portion 31 as shown in FIG. It arrange | positions in the state which surface-contacts with a part.

  In this state, if the cassette type detector 1 vibrates in the radiation incident direction, that is, the vertical direction in FIG. 16, the flexible cable 26 also resonates and tends to move in the radiation incident direction. However, in the present embodiment, the side surface portion 31S of the housing main body portion 31 is formed in a curved surface having a curvature that is substantially the same as the curvature of the flexible cable.

  Therefore, when the flexible cable 26 tries to move upward in the figure relative to the side surface portion 31S of the housing main body portion 31 due to resonance, for example, the upper side of the side surface portion 31S of the housing main body portion 31 formed in a curved surface shape The portion Sa, that is, a part of the side surface portion 31S that is curved toward the radiation incident surface X is prevented from moving upward relative to the portion Sa. For this reason, the flexible cable 26 cannot move upward relative to the side surface portion 31S.

  Further, if the flexible cable 26 tries to move in the opposite direction, that is, downward in the figure relative to the side surface portion 31S of the housing main body portion 31 due to resonance, this time, the housing main body portion 31 formed in a curved surface shape. The lower side portion Sb of the side surface portion 31S, that is, a portion that is a part of the side surface portion 31S and is curved toward the back plate Y, is prevented from moving relatively downward. Therefore, the flexible cable 26 cannot move downward relative to the side surface portion 31S.

  In this way, the side surface portion 31S facing the flexible cable 26 of the housing main body portion 31 (housing 3) is formed in a curved shape, and the inner wall portion of the side surface portion 31S and the flexible cable 26 are formed in surface contact. Even if the cassette type detector 1 vibrates in the radiation incident direction (vertical direction in FIG. 16), relative movement with respect to the side surface portion 31S of the housing main body portion 31 due to resonance of the flexible cable 26 is hindered. It is possible to prevent the cable 26 and the side surface portion 31S of the housing main body portion 31 from relatively moving, and to prevent the flexible cable 26 and the side surface portion 31S of the housing main body portion 31 from rubbing. .

  In this regard, in the conventional FPD 100 shown in FIG. 22, since the side surface portion of the housing 107 is flat, the FPD 100 vibrates in the vertical direction, and the flexible cable 106 resonates with it and moves relative to the housing 107. When trying to do so, the flexible cable 106 that moves relatively up and down like the upper side portion Sa and the lower side portion Sb of the side surface portion 31S formed in the curved shape of the housing main body portion 31 of the present embodiment. There is no structure that inhibits migration. For this reason, the side surface portion of the housing 107 and the flexible cable 106 are easily moved relative to each other and rubbed.

  As described above, according to the cassette type detector 1 according to the present embodiment, the thickness of the housing 3 in the radiation incident direction is 16 mm or less, and is within the range of the JIS standard size in the conventional screen / film cassette. Since the size is within the range, existing devices and equipment such as a bucky table provided for the cassette for CR can be used even when imaging is performed by the portable radiation solid-state detector 1 which is a cassette-type FPD. .

  In addition, even when the cassette type radiation image detector 1 vibrates in the radiation incident direction, the movement of the flexible cable 26 that resonates and moves in the radiation incident direction is inside the side surface portion 31S formed into a curved surface. The side portion 31S of the housing main body 31 and the flexible cable 26 do not move relatively (is not displaced) by being blocked by the upper portion (upper side portion Sa) and the lower side portion (lower side portion Sb) that curve in the direction.

  For this reason, the friction between the side surface portion 31S and the flexible cable 26 does not occur, or even if the friction occurs, only a very small amount of friction is required. Therefore, the wiring is cut by the friction between the flexible cable 26 and the side surface portion 31S of the housing body 31. It is possible to accurately prevent the occurrence of such a failure.

  Further, like the cassette type detector 1 of the present embodiment, the image detector 2 is attached to the side surface 31S of the housing body 31 and holds the image detector 2 so that the image detector 2 does not move in the housing body 31, for example. By providing the buffer member 317, external force transmitted from the outside to the image detection unit 2 can be reduced, and the image detection unit 2 is held at an appropriate position inside the housing 3 by the buffer member 317. Is done.

  Furthermore, in this embodiment, as shown in FIGS. 4A and 4B, the housing 3 of the cassette type detector 1 is formed by folding the plate-like carbon fiber 31A to form the housing main body 31. In the main body 31, the folded end portions 31p and 31q of the plate-like carbon fiber 31A are joined to form a surface Y opposite to the radiation incident surface X, that is, a back plate Y.

  At that time, in the back plate Y, the joining portions of the both end portions 31p and 31q of the plate-like carbon fiber 31A are processed so that at least the outer surface portions thereof are smoothed by removing the irregularities generated during joining. Although it is painted, the joint can be recognized by the touch when touched by the user. Therefore, it is possible to make the joint portion inconspicuous on the appearance design, and if it is touched, it is known that the joint portion is on the back plate Y side of the cassette type detector 1, that is, the back surface side. It becomes possible to reliably prevent the container 1 from being used with the front and back being mistaken.

  Moreover, the both ends 31p and 31q of the plate-like carbon fiber 31A are joined on the back plate Y side to form the housing main body 31 of the cassette-type detector 1, so that the joint is the radiation incident surface of the cassette-type detector 1. When it is formed on X, it is possible to reliably prevent the radiation that is incident on the joint from adversely affecting the radiation image that is obtained.

  In addition, as described above, when the housing main body 31 is formed by winding a fibrous carbon fiber on a mold, both end portions of the fibrous carbon fiber are formed on the formed housing main body 31. By forming it so as to be located at the portion of the back plate Y, it is possible to reliably prevent the both end portions from adversely affecting the incident radiation.

  It is needless to say that the present invention is not limited to the above-described embodiment and its modifications, and can be modified as appropriate.

It is a perspective view which shows the cassette type detector which concerns on this embodiment. It is a disassembled perspective view of the housing in this embodiment. (A) is a figure which shows the buffer member of the 2nd cover member in which cross-sectional shape was formed in V shape, (b) is a figure which shows the state which the image detection part was guided and moved to the horizontal position. (C) is a figure which shows the state by which the image detection part was hold | maintained by the buffer member. (A) It is a figure which shows plate-like carbon fiber, (b) It is a figure which shows the housing main-body part formed by folding back the plate-like carbon fiber of (a). It is the figure which compared the elasticity modulus and heat conductivity of various materials. It is a graph which shows the simulation result about the amount of bending of a housing. (A) It is explanatory drawing explaining how to apply the load at the time of hold | maintaining like a cantilever beam, (b) Explanation explaining how to apply the load at the time of hold | maintaining two edge parts located diagonally FIG. It is a graph which shows the load concerning a glass substrate for every imaging | photography attitude | position. It is a figure which shows schematic structure of a pressure measuring device. It is explanatory drawing which shows the allowable stress of a glass substrate. It is explanatory drawing which shows the maximum stress in the glass substrate of 4 side support, and the largest deflection amount. It is explanatory drawing explaining the glass substrate of 4 sides support. It is a figure which shows the coefficient in the glass substrate of 4 sides support. It is the schematic which shows the internal structure of the cassette type detector shown in FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view which shows the sensor panel in this embodiment. It is the side view which looked at the sensor panel shown in FIG. 17 from arrow F direction. It is GG sectional drawing of the sensor panel shown in FIG. It is an equivalent circuit block diagram for 1 pixel of the photoelectric conversion part which comprises a signal detection part. FIG. 21 is an equivalent circuit configuration diagram in which the photoelectric conversion units illustrated in FIG. 20 are two-dimensionally arranged. It is side surface sectional drawing which shows the structure of the conventional FPD.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cassette type radiographic image detector 2 Image detection part 3 Housing 21 Sensor panel 23 Circuit board (circuit)
24 Base 26 Flexible cable 31 Housing body (main body)
31A Plate-like carbon fibers 31p, 31q Both ends 31S of the plate-like carbon fibers Side surface portion 32 First lid member 33 Second lid member 152 Photodiode (photoelectric conversion element)
211 Scintillator layer (scintillator)
213 Second glass substrate (substrate)
311, 312 Opening 317 Buffer member X Radiation incidence surface Y Surface opposite to the radiation incidence surface

Claims (7)

A sensor panel comprising a plurality of photoelectric conversion means formed on a substrate, and a scintillator provided opposite to the photoelectric conversion means for converting incident radiation into light;
A base on which a circuit related to the photoelectric conversion means is provided on the surface opposite to the surface facing the sensor panel;
A flexible cable connecting the photoelectric conversion means on the sensor panel and the circuit on the base;
An image detection unit with a built-in housing,
A cassette-type radiation image detection, wherein a side surface portion of the housing facing the flexible cable is formed in a curved shape, and an inner wall portion of the side surface portion is formed in surface contact with the flexible cable. vessel.   The cassette-type radiation image detector according to claim 1, wherein the side surface portion formed in a curved shape of the housing is formed in a circular arc shape in cross section.   The cassette type radiographic image detector according to claim 1, wherein the housing has a thickness in a radiation incident direction conforming to JIS Z 4905. 4.   The cassette type radiation image detector according to any one of claims 1 to 3, wherein the housing has a thickness in a radiation incident direction of 16 mm or less. The housing is formed to have a main body having openings at both ends, and a first lid member and a second lid member that cover the openings of the main body,
The side surface portion of the main body portion of the housing facing the flexible cable is formed in a curved shape, and the inner wall portion of the side surface portion is formed in surface contact with the flexible cable. The cassette type radiation image detector according to any one of claims 1 to 4.   The cassette type radiation image detector according to claim 5, wherein the image detection unit is attached to the side surface of the main body via a buffer member. The housing is formed by folding the plate-like carbon fiber or winding the fibrous carbon fiber to form the main body part,
The main body portion is formed such that both folded end portions of the plate-like carbon fiber or both wound end portions of the fibrous carbon fiber are located on a surface opposite to the radiation incident surface. The cassette-type radiation image detector according to claim 5 or 6, characterized in that

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