JP2009136439A - Cassette radiation image solid detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cassette radiation image solid detector, a slim FPD capable of digitalizing image data, having the interchangeability with a CR cassette, capable of bearing loads from outside and capable of the portable photography. <P>SOLUTION: The cassette radiation image solid detector comprises a detector unit 2 comprising a rectangular second glass base material 213, a signal detecting part 151 for converting incoming radiation to detection signals and a control unit including a control part 27 to control the signal detecting part 151; and a housing 3 to house the detector unit 2 inside. The thickness of the housing 3 in the radiation incoming direction is not more than 16 mm, and has a plane part 51. The rigidity in the vicinity of ridge lines is higher than that at the center of the plane part 51. The components of the control unit are disposed within respective areas divided by diagonal lines of the plane part 51 and in such a way as not to be astride a plurality of areas. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cassette type radiation image solid state 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) apparatuses for obtaining the above are widely used (see, for example, Patent Document 1 and Patent Document 2).

  In radiographic imaging, a cassette (for example, see Patent Document 1 and Patent Document 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, an FPD (Flat Panel Detector) is known as a detector for detecting irradiated radiation and acquiring it as digital image data (see, for example, Patent Document 3). Furthermore, a portable photographing apparatus (portable FPD) in which this FPD is housed in a housing has come into practical use.

However, in imaging using a cassette, depending on the imaging method, the patient's total load (overall weight) may act on the cassette front member (radiation incident side during imaging). For example, when a cassette is placed on a relatively stiff bucky table and a patient rides on it and takes a picture in a supine position, the load on the imaging region of the patient (on the front member of the cassette ( Since the weight) acts, the front plate bends downward.
In addition, a patient in a lying position on a bed or the like may be photographed. In this case, since the cassette is inserted between the patient and a flexible futon, the cassette itself is not attached to the patient. There is a possibility of bending (distorting) due to the influence of the load (weight), and there is a risk of damage to electronic components and the like housed inside.

Therefore, for example, the stress due to the static load is absorbed by the support member that supports the panel-like radiation detection means, and a space is provided between the radiation detection means and the housing (housing), and the impact load from the outside is A configuration has been proposed in which damage to an electronic component or the like due to a load is prevented by absorbing in a gap between the radiation detection means and the housing (see, for example, Patent Document 4).
JP 2005-121783 A JP 2005-114944 A JP-A-9-73144 Japanese Patent Laid-Open No. 2002-14170

  As described above, the currently popular CR cassettes are sized according to the JIS standard size of conventional screen / film cassettes, and the Bucky table and the like are also made according to the JIS standard size. . For this reason, if the FPD can be used in a cassette that conforms to this JIS standard size, the existing equipment installed in the facility can be used for photographing using the FPD, and as a photographing means Equipment investment when introducing FPD can be minimized.

However, when the FPD is stored in a cassette according to the above JIS standard size, the housing is considered in consideration of the thickness of each component (for example, scintillator, glass substrate, circuit board, control board, base, etc.) stored inside. The gap between the front side surface (radiation incident side surface) and each component and the gap between the housing back side surface (the surface opposite to the radiation incidence side) and each component can be secured only about 1 mm. .
For this reason, it is difficult to employ a configuration in which a space for absorbing an impact is provided between the radiation detection means and the housing (housing) as described in Patent Document 4.

  Further, since the space that can be secured in the housing is small as described above, the housing is bent due to the load due to the weight of the patient assumed at the time of photographing, and there is no space inside. As a result, a load is applied to the scintillator, various electronic components, and the like, which may cause damage to the components and deterioration of image quality.

  Accordingly, an object of the present invention is an FPD that can achieve digitization of image data, is thin and compatible with a cassette for CR, can handle external loads, and performs portable shooting. It is to provide a cassette type radiographic image solid state detector capable of performing the above.

In order to solve the above problems, the present invention provides:
A control including a rectangular substrate, a detection unit provided on one surface of the substrate and converting incident radiation into a detection signal, and a control unit provided on the other surface of the substrate and controlling the detection unit A detector unit comprising: a unit;
A housing containing the detector unit;
The housing has a rectangular portion, the rigidity of each ridge line vicinity portion is higher than the central portion of the rectangular portion, and the thickness of the housing in the radiation incident direction is 16 mm or less,
The cassette-type radiographic image solid detection is characterized in that the constituent parts constituting the control unit are located in an area defined by diagonal lines of the rectangular part and are arranged not to span a plurality of areas. It is a vessel.

The present invention also provides:
A control including a rectangular substrate, a detection unit provided on one surface of the substrate and converting incident radiation into a detection signal, and a control unit provided on the other surface of the substrate and controlling the detection unit A detector unit comprising: a unit;
A housing containing the detector unit;
The housing has a rectangular portion, the rigidity of each ridge line vicinity portion is higher than the central portion of the rectangular portion, and the thickness of the housing in the radiation incident direction is 16 mm or less,
In the region excluding the vicinity of the four corners of the rectangular portion, the constituent parts constituting the control unit are located in the region partitioned by the diagonal line of the rectangular portion and do not straddle a plurality of regions. It is a cassette type radiographic image solid state detector characterized by being arranged.

  According to the cassette type radiation image solid-state detector (cassette FPD) of the system as in the present invention, the components constituting the control unit are located in a region defined by diagonal lines of the rectangular portion in the housing, Since it is arranged so as not to straddle the area, even if the detector unit housed inside the housing or the housing is bent due to an external load or the like, a load is applied to the components constituting the control unit. This can prevent the occurrence of failure and the like.

  Hereinafter, a first embodiment of a cassette-type radiation image solid state detector according to the present invention will be described with reference to FIGS. 1 to 20. 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 solid-state detector (hereinafter referred to as “cassette type detector”) in the present embodiment.
A cassette type detector 1 in the present embodiment is a cassette type flat panel detector (hereinafter referred to as “FPD”), and the cassette type detector 1 detects irradiated radiation and outputs digital image data. As a detector unit 2 (see FIG. 12) and a housing 3 for housing the detector unit 2 therein.

FIG. 2 is an exploded perspective view of the housing 3 in the present embodiment.
As shown in FIG. 2, the housing 3 has a bottom surface portion 41 and a side wall portion 42 and is formed in a substantially box shape. When the cassette type detector 1 is used for imaging, an opening 48 is formed on the radiation incident side. And a front member 5 disposed on the radiation incident side of the cassette type detector 1.

  The front member 5 includes a flat portion 51 that is a rectangular portion formed in a rectangular shape, and a bent rising portion (side wall portion) 52 that is configured integrally with the flat portion 51. Similarly, it is formed in a box shape. The front member 5 has an opening 58 on the side opposite to the radiation incident side when the cassette type detector 1 is used for imaging, and functions as a lid for closing the opening 48 of the back member 4.

The housing 3 is integrated by joining the back member 4 and the front member 5 together. The joining method of the back member 4 and the front member 5 is not specifically limited, For example, you may join by screwing, and you may adhere and fix.
In addition, it is preferable that the height of the bending rising part 52 of the front member 5 and the height of the side wall part 42 of the back member 4 are substantially 1: 1.

  In the present embodiment, the thickness of the housing 3 in the radiation incident direction is 15 mm. Although the thickness dimension of the housing 3 in the radiation incident direction is not limited to 15 mm, it should be within the range of the JIS standard size (15 mm + 1 mm and 15 mm-2 mm) 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 housing 3 is configured such that the bending rigidity (bending strength) in the vicinity of the ridge line between the flat surface portion 51 and the bending rising portion 52 is higher than the central portion of the flat surface portion (rectangular portion) 51 of the front member 5. Yes. That is, since the central part of the flat part (rectangular part) 51 has nothing to support, there is only the strength of the thickness of the flat part 51 of the front member 5, the force applied from the outside (patient) (patient weight), etc. In contrast, the ridge line vicinity portion of the flat surface portion 51 is supported by the bending rising portion 52 formed integrally with the flat surface portion 51, so that when an external force is applied, Distortion is less likely to occur.

Of the members constituting the housing 3, at least the front member 5 is formed of a material having a high radiation transmittance including carbon fiber or the like. The housing 3 is formed of a super-elastic material made of, for example, a super-elastic modulus carbon fiber, for example, at least the front member 5 which is a radiation incident side surface in order to minimize the deflection of an external load. It is preferable that Conventionally, many carbon plates use PAN-based carbon fibers having a tensile elastic modulus of about 200 Gpa. On the other hand, for example, if a carbon plate using pitch (PITC) -based carbon fiber, there is a tensile elastic modulus of about 800 Gpa, a carbon plate using such a pitch-based carbon fiber, It is preferable to use it as a super-elastic material that forms the front member 5.
The method for forming the housing 3 is not particularly limited. For example, a carbon prepreg (carbon plate material) that is a sheet in which a carbon fiber is impregnated with a thermosetting resin such as an epoxy resin or an unsaturated polyester is formed into the shape of the front member 5. A desired shape can be obtained by stacking on a molded mold and baking it at high temperature and pressure.

  In the present embodiment, the back member 4 is formed of a light metal such as aluminum or magnesium. In addition, the material which forms the back member 4 is not specifically limited, For example, it may be formed with the material containing a carbon fiber etc. similarly to the front member 5. FIG.

  In order to prevent the external load (patient weight, etc.) from affecting the detector unit 2 housed in the housing 3, the cassette is made with the front member 5 and the back member 4 joined. It is necessary to regulate the deflection amount of the mold detector 1 as a whole to be within the allowable deflection amount of the detector unit 2.

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 base materials 213 and 214 constituting the detector unit 2 will be described with showing data. .
FIG. 3 shows a simulation result of the amount of deflection of the housing 3 of the cassette type detector 1.

In this simulation, the front member 5 and the back member 4 use pitch-based carbon fibers having a tensile elastic modulus of 790 Gpa as carbon fibers, and the longitudinal direction of the cassette (housing 3) is 0 degrees, and the direction perpendicular to the longitudinal direction. Is formed of a carbon plate material (for example, carbon prepreg) formed by crossing the carbon fibers at 90 degrees, and the height of the side surface portion of the housing 3 integrally formed by the front member 5 and the back member 4 is increased. A cassette type detector 1 having a structure in which the thickness of each of the front member 5 and the back member 4 is 2 mm is 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. 5), the simulation shown in FIG. 3 moves the cassette-type detector 1 disposed under the patient in such a photographing posture. It is about the case to let you.

In FIG. 3, as shown in FIG. 4 (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. This 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 buttock of a patient lying on the bed and the detector is moved by one person to change the position. As shown in FIG. 4B, 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. 3, in any case, the maximum amount of deflection of the housing 3 of the cassette type detector 1 can be less than 2 mm.

  5 shows glass substrates 213 and 214 of the detector unit 2 when the cassette type detector 1 is placed on a relatively rigid object such as a bucky table (see FIG. 13 and the like). ) Shows the result of measurement using a pressure measuring device 7 (see FIG. 6).

For example, as shown in FIG. 6, the pressure measuring device 7 includes a sensor sheet 71 that 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 arranged under the buttock and the cassette type detector 1 is arranged under the shoulder portion, the combination of four kinds of photographing postures and photographing parts is performed. 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. In such an imaging posture, for example, when imaging a patient weighing 100 kg, the maximum load acting on the glass base materials 213 and 214 of the detector unit 2 of the cassette type detector 1 is as shown in FIG. It will be around 11kg.

  Further, the bending amount (strain amount) of the housing 3 generated 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 bending amount of the detector unit 2 is Since the total weight of the patient is 6 mm, the glass substrate is used even when the cassette-type detector 1 set under the patient is moved, changed in position, etc. The maximum stress acting on 213, 214 does not exceed the allowable stress of the glass base material 213, 214, and failure such as cracking of the glass base material 213, 214 is not induced.

That is, as shown in FIG. 7, in the case of a glass plate (glass substrate) of 8 mm or less, the allowable stress (short-term allowable stress) for the momentarily applied force acting when the cassette type detector 1 is moved is It is 24.5 MPa in the plane of the glass substrate.
And when equally distributed load is applied in the state which supported four sides of the rectangular plate-shaped member like the glass base materials 213 and 214, as shown in FIG. 8, the maximum stress is 23 MPa, and the maximum deflection amount Is 6 mm.
In addition, as shown in FIG. 9, the maximum stress in FIG. 8 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. Coefficients α ₁ and β ₁ when b / a is 1.2 are determined (see FIG. 10), calculated by Equation (1), and the maximum deflection amount is obtained by Equation (2) under similar conditions. Calculated.

  As described above, when the maximum load that can be assumed in using the cassette type detector 1 is applied, the maximum stress is 23 MPa, and the maximum deflection is 6 mm. Like the materials 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 amount of deflection within 6 mm is allowed. Therefore, it can be said that no failure such as cracking occurs in the glass base materials 213 and 214 and the detector unit 2 including the same in any photographing posture.

The housing 3 is not limited to the one having the above-described configuration, and a housing having a general configuration that is put into practical use in the CR system can be adopted. That is, for example, in the case of a housing that includes a front plate and a back plate that can be separated from the cassette, and that locks the front plate and the back plate by a lock mechanism that includes a plurality of locking claws (for example, JP-A-2002-156717). And a cover member that is attached to the housing and that is at least partially openable / closable with respect to the housing, and a protrusion provided on the cover member is provided in a recess provided in the housing. Even in the case of a housing configured to lock the housing and the cover member by fitting (see, for example, Japanese Patent Application Laid-Open No. 2001-66721), the maximum deflection amount in the state where the cassette is locked (the state used for photographing) is The glass substrate 21 is less than 5 mm, which is the same as the above embodiment, and the allowable deflection amount of the glass substrates 213 and 214 is larger than this. , Never failure such as cracking to 214 and detector unit 2 including this occurs.
Thus, according to the present invention, since no special configuration is required to improve the strength of the housing 3 of the cassette type detector 1, the degree of freedom in designing the housing 3 can be increased.

As shown in FIG. 2, a back side cutout portion 43 is provided from one side to the back side at one end of the back member 4 on the side orthogonal to the longitudinal direction, and the side orthogonal to the longitudinal direction of the front member 5. A front side notch 53 is provided at a position corresponding to the back side notch 43.
It is preferable that the width dimension of the back side notch part 43 and the front side notch part 53 is larger than the width dimension of the rechargeable battery 25 (refer FIG. 12 etc.) mentioned later. In the present embodiment, the front-side cutout 53 is cut out by 8 mm from the end of the front member 5 toward the center. In addition, although it does not specifically limit how much the front side notch part 53 is notched toward the center part from the edge part of the front member 5, 6 mm or more is preferable and it is more preferable if it is 8 mm or more.
In the present embodiment, when the back member 4 and the front member 5 are joined to each other, the housing 3 has a take-out port 31 through which a rechargeable battery 25 described later can be taken in and out by the back-side notch 43 and the front-side notch 53. It is supposed to be formed.

  Further, the housing 3 includes a lid member 8 that is fitted into the take-out port 31, and the inside of the housing 3 becomes a sealed space by fitting the lid member 8 into the take-out port 31. In the present embodiment, the lid member 8 is formed of a nonconductive material such as a nonconductive plastic.

  Fig.11 (a) is the top view which looked at the cover member 8 in FIG. 2 from the arrow A direction, FIG.11 (b) is BB sectional drawing in Fig.11 (a). As shown in FIGS. 2 and 11B, the lid member 8 includes a side surface portion 81 and a lower surface portion 82 corresponding to the back side notch portion 43, and an upper surface portion 83 corresponding to the front side notch portion 53. Therefore, it is substantially U-shaped in a side view according to the shape of the take-out port 31. Note that the shape of the lid member 8 is not limited to those illustrated here, and may be, for example, an L-shape. In this case, the shape of the front side notch and the back side notch is also a corresponding shape.

  As shown in FIG. 11 (a), guide convex portions 85, 85 are provided on the side end surfaces of the upper surface portion 83 and the lower surface portion 82 of the lid member 8, and the front side cutout portion 53 and the back side cut portion are provided. As shown in FIG. 2, the notch 43 is provided with guide grooves 44 and 54 for guiding the guide convex portions 85 and 85. The lid member 8 is configured to be fitted into the take-out port 31 by sliding the guide convex portions 85 and 85 along the guide grooves 44 and 54. In addition, the structure which takes out the cover member 8 in the taking-out port 31 is not limited to what was illustrated here. For example, the lid member can be opened and closed with respect to the take-out port by connecting the lower surface portion and the back member of the lid member or the upper surface portion and the front member via a hinge and rotating the lid member around the hinge axis. You may comprise so that it may become.

  In addition, an antenna device 9 is embedded in the side surface portion 81 of the lid member 8 for wirelessly transmitting and receiving information between the cassette type detector 1 and an external device.

As shown in FIGS. 2 and 11, the antenna device 9 is connected to a pair of metal-made flat radiation plates 91 and 92 and a pair of radiation plates 91 and 92, and the pair of radiation plates 91 and 92 is connected to the antenna device 9. A power feeding unit 93 that feeds power 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. Further, the antenna device 9 is not limited to the case where the antenna device 9 is embedded in the side surface portion 81 of the lid member 8, and may be attached to the outside or the inside of the lid member 8. However, the antenna device 9 is made of a conductive material such as carbon because the reception sensitivity (reception gain) is lowered when it is provided in the vicinity of a conductive member made of a conductive material such as metal or carbon. It is preferable to be provided at a position as far away as possible from the front member 5 and various electronic components 22 (see FIG. 12 and the like) formed of metal or the like, preferably at least 6 mm or more, more preferably 8 mm or more. .
In this regard, in the present embodiment, as described above, the front-side cutout 53 is cut out by 8 mm from the end of the front member 5 toward the center, and a lid formed of a non-conductive material here. The member 8 is fitted. For this reason, the antenna device 9 provided on the side surface portion 81 of the lid member 8 is disposed at a position 8 mm away from the front member 5 that is formed to include a conductive material such as carbon fiber. This is preferable for maintaining (reception gain).

  A rechargeable battery 25 (FIG. 12) provided inside the housing 3 on the same side of the side surface of the back member 4 as the surface on which the back side notch 43 is formed, as shown in FIGS. A charging terminal 45 connected to an external power source or the like when charging the power source of the cassette type detector 1 is disposed. Further, a notch portion 55 into which the upper edge portion of the power switch is fitted is formed at one end of the bent rising portion 52 of the front member 5 and at a position corresponding to the power switch 46. Furthermore, the corner formed by the bent rising portion 52 and the flat portion 51 where the cutout portion 55 is formed is configured by, for example, an LED or the like to display the charging status of the rechargeable battery 25 and various operation statuses. An indicator 56 is provided.

  12 is a plan view of the state in which the detector 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. 13 is a cross-sectional view taken along the line CC in FIG. 14 and FIG. 14 are DD sectional views in FIG. 12, and FIG. 15 is an EE sectional view in FIG. In FIG. 12, for convenience, the internal state of the housing 3 is shown without the bottom surface portion 41 of the back member 4.

  As shown in FIGS. 12 to 15, the detector unit 2 includes a detection unit 21, various electronic components 22, a control unit including a circuit board 23 on which these components are mounted, and the like. In the present embodiment, the circuit board 23 is fixed to a base 24 formed of a flexible material such as resin, and the circuit board 23 is bonded to the detection panel 21 by bonding and fixing the base 24 to the detection panel 21. It is fixed to the detection panel 21 via the base 24. The base 24 is not an essential component of the present invention, and the circuit board 23 or the like may be directly fixed to the detection panel 21 without the base 24 being interposed.

  As shown in FIG. 12, in this embodiment, the circuit board 23 on which the electronic component 22 is mounted is divided into three parts. Note that the electronic component 22 is preferably arranged along the outer periphery of the detection panel 21 as much as possible. By arranging the electronic component 22 on the circuit board 23 in this manner, the electronic component 22 is ridged on the flat surface portion 51 (rectangular portion) of the front member 5 of the housing 3 when the detector unit 2 is accommodated in the housing 3. It is arranged along.

Note that the shape, number, and arrangement of the circuit board 23 and the shape, number, and arrangement of the electronic components 22 provided on the circuit board 23 are not limited to the illustrated example, but the detector is applied when an external load is applied. In order to prevent the unit 2 itself from being bent and absorb stress and to reduce the amount of bending of the circuit board 23 and prevent the circuit board 23 from being damaged, the electronic component 22 and the circuit board 23 on which the electronic component 22 is mounted are provided. It is preferable not to form them integrally but to divide them into a plurality of parts. Then, as shown in FIG. 12, the circuit board 23 divided into a plurality is arranged inside the housing 3 so as to be located in any region when the plane portion 51 is partitioned by a diagonal line.
Further, the electronic component 22 avoids the central portion of the housing 3 as much as possible so that the electronic component 22 does not interfere with the bottom surface portion 41 of the back member 4 when an external load is applied, and the flat portion 51 ( It is preferable to be disposed at a position close to the ridge line of the rectangular portion.
Since the wiring from the signal detection unit 151 (see FIG. 20), which will be described later, to the circuit board 23 comes from the side surface of the signal detection unit 151, that is, the side surface of the detection panel 21, it is thus mounted on the circuit board 23 and this. If the electronic component 22 is disposed in the vicinity of each corner of the detection panel 21 and is disposed along the ridge line of the flat portion 51, it is desirable that generation of useless parasitic capacitance can be suppressed.

  In the present embodiment, as the electronic component 22 arranged on the circuit board 23, for example, a control unit 27 (see FIG. 20) that controls the signal detection unit 151 (see FIG. 20) that constitutes the detection panel 21 is configured. CPU (central processing unit) (not shown), ROM (read only memory), storage unit (not shown) such as RAM (Random Access Memory), scanning drive circuit 16 (see FIG. 20), signal readout circuit 17 (see FIG. 20). 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 detection panel 21 may be provided.

  The detector unit 2 is provided with a communication unit 28 that transmits and receives various signals to and from an external device. For example, the communication unit 28 transfers the image signal output from the detection 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 supposed to be.

  Further, a plurality of drive units (for example, described later) constituting the cassette-type detector 1 are located on the base 24 at positions corresponding to the outlets 31 when the detector unit 2 is housed in the housing 3. Scan driving circuit 16 (see FIG. 20), signal readout circuit 17 (see FIG. 20), communication unit 28, storage unit (not shown), charge amount detection unit (not shown), indicator 56, detection panel 21, etc. ) Is provided with a rechargeable battery 25 as a power supply unit for supplying power.

  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 such as a cradle (not shown), 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. .

In the present embodiment, the electronic component 22, such as the control unit 27, the scanning drive circuit 16 (see FIG. 20), the signal readout circuit 17 (see FIG. 20), the circuit board 23 on which the electronic component 22 is mounted, the rechargeable battery 25, and the communication unit. A control unit is constituted by the constituent parts such as 28.
As shown in FIG. 12, each component constituting the control unit divides the base 24 into four regions by diagonal lines connecting the corners of the flat portion 51 of the front member 5 which is a rectangular portion of the housing 3. In such a case, it is located in any region partitioned by the diagonal line, and is arranged so as not to straddle a plurality of regions (avoid the diagonal line).
The cassette-type detector 1 tends to bend around a diagonal line connecting the corners of the flat portion 51 when, for example, one end is held like a cantilever, and deformation is most likely to occur in this portion. For this reason, by disposing the circuit board 23 and the like while avoiding the diagonal line, it is possible to reliably prevent the components constituting the control unit such as the electronic component 22 from being damaged.

  As shown in FIGS. 12, 14, and 15, between each electronic component 22 and the rechargeable battery 25, a buffer member 26 that protects these components from being damaged by interference with the housing 3. Is provided. In addition, the number, arrangement | positioning, etc. of the buffer member 26 and the electronic component 22 are not limited to what was illustrated here. The material of the buffer member 26 is not particularly limited, and for example, an elastic resin such as polyurethane can be applied.

16 is a plan view of the detection panel 21, FIG. 17 is a side view of the detection panel 21 as viewed from the direction of arrow F in FIG. 16, and FIG. It is sectional drawing.
The detection panel 21 includes a scintillator layer (light emitting layer) 211 that converts incident radiation into light, a first glass substrate 214 formed on one surface, and is laminated below the scintillator layer 211 and converted by the scintillator layer 211. The signal detector 151 (see FIG. 20) 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, 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, vapor deposition using a phosphor. The phosphor layer is formed 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). ) Is further laminated with a glass protective film 215.
A second glass substrate 213 is laminated on the lower side of the scintillator layer 211 (the side opposite to the side on which radiation is incident at the time of photographing), and glass is formed on the lower side of the second glass substrate 213. A protective film 216 is further laminated.

  Both the first glass substrate 214 and the second glass substrate 213 have a thickness of about 0.6 mm and are formed in a rectangular shape. Both glass base materials 214 and 213 are cut by cutting the end face with a laser, so that the end face, that is, the cut face, the ridge line portion between the cut face and the upper face of the glass base, and the cut face and the lower face of the glass base Smoothing processing is performed to smooth the ridge line portion. In addition, the thickness of the 1st glass base material 214 and the 2nd glass base material 213 is not limited to 0.6 mm. Further, the first glass substrate 214 and the second glass substrate 213 may have different thicknesses.

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 base material 214 and the second glass base material 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 size of the external force, the glass substrate cracks are caused by the formation of partial burrs and partial protrusions that cause stress concentration when cutting the glass substrate. 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 laser optical. A YAG laser or the like used as a medium is preferably used, but the cutting apparatus used for cutting is not limited to this.

On the upper side of the second glass substrate 213 (side facing the scintillator layer 211), electromagnetic waves (light) output from the scintillator layer 211 are converted into electric energy and accumulated, and an image based on the accumulated electric energy. A signal detector 151 (see FIG. 20), which is a detector that outputs a signal, is formed.
Thus, in the present embodiment, the second glass substrate 213 is provided with the signal detection unit 151 (see FIG. 20) as the detection unit on one surface and the circuit on the other surface via the base 24. It is a rectangular substrate provided with a control unit composed of the substrate 23 and the like.

As described above, in the present embodiment, the signal detection unit 151 is stacked on the lower side of the scintillator layer 211, and the second glass substrate 213 disposed on the lower side of the signal detection unit 151, and the scintillator layer 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 211 and 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, so a space was provided between the housing and the glass substrate. A buffer member that relaxes / reduces the external force is frequently used. For this reason, the housing is further increased in size.
In this regard, the inventors of the present invention, rather than the size of the external force acting on the glass substrate, the partial burrs that cause stress concentration during the cutting of the glass substrate, It has been found that this is due to the formation of partial 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 base materials 213 and 214 with respect to loads and deflections caused by weight and the like.

  In addition, a sealing member 217 is provided along the outer peripheral edge of the first glass base material 214 and the second glass base material 213, and the first glass base material 214 and the second glass base material 217 are provided by the sealing member 217. The glass substrate 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, air is sucked from the space between the first glass substrate 214 and the second glass substrate 213. After the deaeration, the sealing member 217 is used for bonding and bonding. This prevents moisture contained in the air from affecting the scintillator layer 211 and the like. Long life can be achieved.

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

  Here, the circuit configuration of the detection panel 21 will be described. FIG. 19 is an equivalent circuit diagram of a photoelectric conversion unit for one pixel constituting the signal detection unit 151.

  As shown in FIG. 19, the configuration of the photoelectric conversion unit for one pixel is a photodiode 152 and a thin film transistor (hereinafter referred to as “TFT”) 153 that extracts electrical energy accumulated in the photodiode 152 as an electrical signal by switching. It consists of and. 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. 20 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.

  Further, in the present embodiment, the case where the photodiode 152 as a photoelectric conversion element is used as the imaging element is illustrated, but a solid-state imaging element 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 element) 152 to scan and drive each photodiode 152, and the electric power stored in each photoelectric conversion element 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, first, a second glass substrate 213 having a signal detection unit 151 formed on one surface, and a first glass substrate 214 having a scintillator layer 211 attached to one surface are combined into a scintillator layer. 211 and the signal detection unit 151 are stacked so as to face each other, and after the space between the first glass substrate 214 and the second glass substrate 213 is deaerated, both of them are sealed by the sealing member 217. The glass substrates 213 and 214 are bonded and bonded. Next, the base 24 on which the circuit board 23 on which the various electronic components 22 are arranged and the rechargeable battery 25 are mounted at predetermined positions is placed on the first glass so that the side on which the circuit board 23 and the rechargeable battery 25 are mounted is down. Fix to the back side of the substrate 214. Thereby, the detector unit 2 is completed.

  Next, after the buffer member 26 is appropriately disposed at a location where the circuit board 23 and the rechargeable battery 25 are not disposed, the detector unit 2 is placed in the back member 4 so that the first glass base material 214 is on the upper side. Store in. Then, the power switch 46, the charging terminal 45, the indicator 56 provided on the side surface of the back member 4 and the respective electronic components 22 are electrically connected. Further, the front member 5 is joined to the back member 4, and the lid member 8 is taken out and fitted into the outlet 31. Thereby, the antenna device 9 provided in the lid member 8 is electrically connected to the electronic component 22 of the detector unit 2.

  When the cassette-type detector 1 is used for imaging, for example, a patient to be imaged is laid on a bed, and the cassette-type detector 1 is placed on the side where the scintillator layer 211 is provided between the bed and the patient's body. The detector 1 is inserted and photographing is performed. Further, the cassette type detector 1 can be set and used on a Bucky table or the like used for photographing with an existing CR cassette.

  As described above, according to the present embodiment, the thickness of the housing 3 in the radiation incident direction is 15 mm, and the dimensions are within the range of the JIS standard size in the conventional screen / film cassette. Even when photographing with the cassette-type detector 1 which is the FPD, existing devices and equipment such as a bucky table provided for the cassette for CR can be used.

Further, since the cassette type detector 1 is loaded with a weight such as a patient's weight at the time of photographing, rigidity (strength) with respect to the load is required. In the present embodiment, the detection panel 21 is composed of two glass substrates (second glass substrates). The glass substrate 213 and the first glass substrate 214) are sandwiched between the scintillator layer 211 and the signal detector 151, and the glass substrate 213 and 214 are cut by a laser to smooth the end surface. Since the treatment is performed, the bending rigidity (bending strength) of the glass base materials 213 and 214 is high.
Further, the detector unit 2 is housed in a housing 3 having a flat portion 51 that is a rectangular portion and having a bending rigidity (bending strength) in the vicinity of the ridge line higher than that of the central portion of the flat portion 51. .
For this reason, even when the cassette type detector 1, which is a cassette type FPD, is thinned to conform to the JIS standard size, the cassette type detector 1 as a whole is unlikely to be bent or deformed. In addition, the detector unit 2 housed in the housing 3 allows bending to some extent flexibly with respect to an external load (for example, the patient's weight), and thus the detection panel 21 and the like are not easily damaged or distorted. Accurate shooting can be performed.

  Furthermore, each component that constitutes the control unit, such as the electronic component 22, is located in any region partitioned by the diagonal line of the flat surface portion 51 that is a rectangular portion, so as not to straddle a plurality of regions. Since it is arranged away from the diagonal line, the electronic component 22 or the like is not easily affected by bending or deformation when the one end of the cassette-type detector 1 is held in a cantilever manner, The occurrence of a failure can be prevented.

  Further, since the scintillator layer 211 and the signal detection unit 151 are sandwiched between two glass base materials (first glass base material 214 and second glass base material 213), when an external load is applied, etc. The scintillator layer 211 and the signal detection unit 151 can be prevented from being damaged.

  Further, since the space between the first glass substrate 214 and the second glass substrate 213 is degassed, corrosion of the scintillator layer 211 due to moisture contained in the air can be prevented. .

  In the present embodiment, the antenna device 9 is disposed at a position 8 mm away from the member (front member 5) formed of a conductive material, so that the reception sensitivity (reception gain) of the antenna device 9 is increased. Can be maintained.

In the present embodiment, the housing 3 is composed of the back member 4 and the front member 5 as an example, but the configuration of the housing 3 is not limited to this.
For example, as shown in FIG. 21, the housing 6 may be composed of a hollow cylindrical member 61 and a lid member 62 that closes both ends thereof. In this case, the cylindrical member 61 constituting the housing 6 is formed by, for example, winding a carbon fiber on a core material (mold) to adjust the shape, and flowing a thermosetting resin on the wound carbon fiber. It is formed by baking and hardening at high temperature and high pressure, and then the core material is removed. When the housing 6 has such a configuration, the power switch 46, the charging terminal 45, the indicator 56, and the antenna device 9 are provided on one lid member 62. In this case, since the cylindrical member 61 of the housing 6 can be integrally formed of carbon fiber, it can be seamless and have high rigidity and hermeticity, and simplification of the manufacturing process. Can be planned.

  Further, the number, size, and the like of the components constituting the cassette type detector can be appropriately changed according to the size of the cassette type detector. For example, in the case of a cassette type detector having a small size such as a four-cut size (10 inches × 12 inches), as shown in FIG. 22, the number of circuit boards 36 on which electrical components 35 such as a control unit are mounted. Is one. Even in this case, each component constituting the control unit, such as the circuit board 36 and the rechargeable battery 25, has four bases 24 with diagonal lines connecting the corners of the flat portion of the front member which is a rectangular portion of the housing 3. When divided into regions, they are positioned so as not to straddle a plurality of regions within one of the regions partitioned by the diagonal line. Thus, by disposing each component part away from the diagonal line, it is possible to prevent each component part from being affected even when the cassette type detector is bent or deformed. In this case as well, it is preferable that the electronic component 35 be arranged along the outer periphery of the detection panel as much as possible.

  In the present embodiment, the detachable rechargeable battery 25 is provided, and the antenna device 9 is provided on the lid member 8 fitted into the take-out port 31 for taking out the rechargeable battery 25. However, the antenna device 9 is indispensable. It is good also as a structure which is not provided with the antenna apparatus 9 instead of a component. Moreover, it is good also as a structure which cannot remove the rechargeable battery 25. In this case, since it is not necessary to provide the extraction port 31 and the lid member 8, the rigidity of the housing 3 can be further increased. Further, the position where the rechargeable battery 25 is disposed is not limited to the position shown in the embodiment. For example, the rechargeable battery 25 may be disposed along the ridge line of the housing 3 in the longitudinal direction of the cassette type detector 1.

  In the case of a six-cut size (8 inch × 10 inch size) or a four-cut size (10 inch × 12 inch size), the arrangement as shown in this embodiment may be used, but a half-cut size (14 inch × 14 inch). In the case of a size of 17 inches), the position of the take-out port 31 into which the lid member 8 is fitted is preferably at each corner of the housing 3. If there is a cutout portion such as the outlet 31, the strength of the cutout portion is weakened, and the effect becomes more significant as the size of the cassette-type detector 1 increases. This is because it is necessary to arrange the take-out port 31 at the corner to prevent the strength from being lowered as much as possible. In this case, the rechargeable battery 25 is also arranged at a position corresponding to the lid member 8.

  In the present embodiment, an indirect conversion type FPD in which the detection panel 21 includes the scintillator layer 211 and the signal detection unit 151 has been described as an example. However, the FPD is not limited to the indirect conversion type. For example, an amorphous selenium (a-Se) layer that absorbs radiation and converts the radiation into electric charge is provided, and radiation photons are drawn into the a-Se layer at a high voltage, so that It is possible to apply the configuration of the present invention in which an a-Se layer is sandwiched between two glass substrates even in a direct conversion type FPD that directly converts radiation energy into an electric charge amount (converts into an electrical signal). is there.

  In the present embodiment, the scintillator layer 211 is a phosphor layer that is vapor-grown on a support, and the scintillator layer 211 is attached to one surface of the first glass substrate 214 by attaching the scintillator layer 211 to the first surface. Although the case where it forms on the glass base material 214 was made into an example, the scintillator layer 211 is not limited to this, For example, it is fluorescent on the surface below the 1st glass base material (opposite side to a radiation incident side). You may make it form a scintillator layer on a 1st glass base material by methods, such as vapor-depositing a body directly.

  Further, in the present embodiment, the signal detection unit 151 is formed on the second glass substrate 213, but the signal detection unit 151 is formed separately from the second glass substrate. It is good also as a structure mounted on a 2nd glass base material.

Moreover, although this embodiment demonstrated the case where a glass surface was damaged using a laser as a smoothing method of smoothing an end surface, the smoothing method is not limited to what was illustrated here. For example, after cutting the first glass substrate and the second glass substrate using a cemented carbide, diamond, or the like, the post-processing such as polishing the cut end faces or heat-treating the cut end faces with a laser. The end face may be smoothed by performing.
Moreover, although this embodiment demonstrated as an example the case where the two-step work process of cut | disconnecting (dividing) after scratching the glass surface with a laser was demonstrated, as a structure which performs even the cutting | disconnection of a glass base material with a laser. Also good.

  Moreover, although this embodiment demonstrated as an example the case where a rechargeable secondary battery (rechargeable battery 25) was used as an electric power supply part, an electric power supply part is not limited to a secondary battery. For example, a primary battery that requires battery replacement such as a manganese battery, a nickel / cadmium battery, a mercury battery, or a lead battery may be used.

  In addition, it is needless to say that the present invention is not limited to the above embodiment and can be modified as appropriate.

  Next, a second embodiment of the cassette type radiation image solid state detector according to the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment in the arrangement of each component of the control unit made of a circuit board or the like, and therefore, the following description will particularly focus on differences from the first embodiment. To do.

In the present embodiment, the cassette type radiation image solid detector (hereinafter referred to as “cassette type detector”) houses the detector unit 2 and the detector unit in the same manner as in the first embodiment. And a housing 3.
The housing 3 includes a back member and a front member (not shown), and the front member includes a flat portion that is a rectangular portion formed in a rectangular shape.
The detector unit 2 includes a detection panel and a control unit including an electronic component 37 such as a control unit.

  FIG. 23 is a plan view of the state in which the detector unit 2 is housed in the housing 3 as viewed from the lower side (the side opposite to the radiation incident side during imaging).

As shown in FIG. 23, in this embodiment, the circuit board 38 on which the electronic component 37 is mounted is divided into four.
Note that the electronic component 37 is preferably arranged along the outer periphery of the detection panel as much as possible. By disposing the electronic component 37 on the circuit board 38 in this way, the electronic component 37 follows the ridgeline of the flat portion (rectangular portion) of the front member of the housing 3 when the detector unit 2 is accommodated in the housing 3. Arranged.

In the present embodiment, similarly to the first embodiment, the electronic components 37 such as the control unit, the scanning drive circuit, and the signal readout circuit, the circuit board 38 on which the electronic components 37 are mounted, the rechargeable battery 25, the communication unit 28, and the like are configured. The control unit is configured by the unit. When the base 24 is divided into four regions by diagonal lines connecting the corners of the flat portion of the front member, which is a rectangular portion of the housing 3, the region α (excluding regions corresponding to the vicinity of the four corners of the flat portion) (see FIG. 23, the components constituting the control unit are located within the region partitioned by the diagonal line and do not straddle a plurality of regions (diagonal line). Is located).
In the present embodiment, in the region corresponding to the vicinity of the four corners of the plane portion (the region other than the region α surrounded by the one-dot chain line in FIG. 23), each component constituting the control unit such as the circuit board 38. May be arranged on a diagonal line so as to straddle a plurality of regions. Since the vicinity of the four corners of the flat portion is relatively high in rigidity, even if the respective components such as the circuit board 38 are arranged diagonally in this way, they are not easily affected by bending or deformation, and there is little possibility of causing a failure or the like.

  Note that the shape, number, and arrangement of the circuit board 38 and the shape, number, and arrangement of the electronic components 37 provided on the circuit board 38 are not limited to the illustrated example, as in the first embodiment.

  Since other configurations are the same as those of the first embodiment, the same members are denoted by the same reference numerals, and description thereof is omitted.

  Next, the operation in this embodiment will be described.

First, the circuit board 38 on which the electronic components 37 are arranged, the rechargeable battery 25, and the communication unit 28 are mounted at predetermined positions on the base 24, and the base 24 is fixed to the detection panel to form the detector unit 2. To do.
When mounting each component constituting the control unit such as the circuit board 38 on the base 24, the circuit board 38 or the like is partitioned by diagonal lines connecting the corners of the flat surface within the region α of the base 24. It is located in any one of the areas, and is arranged so as not to straddle a plurality of areas (avoid diagonal lines).

  Since other operations are the same as those of the first embodiment, description thereof is omitted.

  As described above, according to the present embodiment, in the region α excluding the region corresponding to the vicinity of the four corners of the planar portion, each component such as the circuit board 38 is any region partitioned by the diagonal line. Therefore, the circuit board 38 and the like do not straddle the diagonal line that is most likely to be bent or deformed. For this reason, it is possible to more reliably prevent the respective components such as the electronic component 37 and the circuit board 38 from being damaged.

  Note that the region α excluding the region corresponding to the vicinity of the four corners of the planar portion is not limited to the region indicated by the dashed line in FIG. 23, and each component such as the circuit board 38 is in the wider region. You may make it arrange | position in any area | region divided with a diagonal line.

  In addition, it is the same as that of 1st Embodiment that this invention is not limited to this embodiment.

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. It is a graph which shows the simulation result about the amount of bending of a housing. It is explanatory drawing explaining how to apply the load at the time of hold | maintaining like a cantilever. It is a graph which shows the load concerning a glass base material 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 base material. It is explanatory drawing which shows the maximum stress in the glass base material of 4 side support, and the largest deflection amount. It is explanatory drawing explaining the glass base material of 4 sides support. It is a figure which shows the coefficient in the glass base material of 4 sides support. Fig.11 (a) is the front view which looked at the cover member from the arrow A direction in FIG. 2, FIG.11 (b) is BB sectional drawing of Fig.11 (a). It is the schematic which shows the internal structure of the cassette type detector shown in FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. It is a top view which shows the detection panel in this embodiment. It is the side view which looked at the detection panel shown in FIG. 16 from the arrow F direction. It is GG sectional drawing of the detection 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. 20 is an equivalent circuit configuration diagram in which the photoelectric conversion units illustrated in FIG. 19 are two-dimensionally arranged. It is a perspective view which shows the modification of the cassette type detector shown in FIG. It is the schematic which shows the internal structure of the modification of the cassette type detector shown in FIG. It is the schematic which shows the internal structure of the cassette type detector which concerns on 2nd Embodiment.

Explanation of symbols

1. Cassette type detector (Cassette type radiation image solid state detector)
2 detector unit 3 housing 4 back member 5 front member 8 lid member 9 antenna device 21 detection panel 22 electronic component 23 circuit board 24 base 25 rechargeable battery (power supply unit)
26 Buffer member 27 Control unit 28 Communication unit 41 Bottom surface portion 42 Side wall portion 51 Flat surface portion (rectangular portion)
52 Bending Standing Unit 151 Signal Detection Unit (Detection Unit)
211 scintillator layer 213 second glass substrate 214 first glass substrate 217 sealing member (adhesive member)

Claims (3)

A control including a rectangular substrate, a detection unit provided on one surface of the substrate and converting incident radiation into a detection signal, and a control unit provided on the other surface of the substrate and controlling the detection unit A detector unit comprising: a unit;
A housing containing the detector unit;
The housing has a rectangular portion, the rigidity of each ridge line vicinity portion is higher than the central portion of the rectangular portion, and the thickness of the housing in the radiation incident direction is 16 mm or less,
The cassette-type radiographic image solid detection is characterized in that the constituent parts constituting the control unit are located in an area defined by diagonal lines of the rectangular part and are arranged not to span a plurality of areas. vessel.   The cassette type radiation image solid state detector according to claim 1, wherein the control unit includes a power supply unit that supplies power to the drive unit and a circuit board. A control including a rectangular substrate, a detection unit provided on one surface of the substrate and converting incident radiation into a detection signal, and a control unit provided on the other surface of the substrate and controlling the detection unit A detector unit comprising: a unit;
A housing containing the detector unit;
The housing has a rectangular portion, the rigidity of each ridge line vicinity portion is higher than the central portion of the rectangular portion, and the thickness of the housing in the radiation incident direction is 16 mm or less,
In the region excluding the vicinity of the four corners of the rectangular portion, the constituent parts constituting the control unit are located in the region partitioned by the diagonal line of the rectangular portion and do not straddle a plurality of regions. A cassette-type radiation image solid-state detector characterized by being arranged.

Images