JP2018080916A - Portable radiation imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain good sealability inside the housing.SOLUTION: A portable radiation imaging device 1 has a sensor panel SP formed by a plurality of radiation detection elements arranged two-dimensionally and a casing 40 housing the sensor panel SP, and the casing 40 has a front member 41 on the side where radiation is incident and a back member 42 opposite to the front member 41. A seal member 63 is provided between the front member 41 and the back member 42, and the minimum value of the ratio of the width to the thickness after compression in the cross section of the corner portion 631 of the sealing material 63 positioned at the corner portion of the housing 40 is set to be larger than the minimum value of the ratio of the width to the thickness after compression in the cross section of the portion 632 other than the corner portion of the sealing material 63.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a portable radiographic image capturing apparatus.

Conventionally, CR (Computed Radiography) cassettes with a built-in photostimulable phosphor sheet that accumulates the energy of radiation that has passed through a subject have been widely used as devices used for radiographic imaging for the purpose of disease diagnosis and the like.
In recent years, as an alternative to the above-mentioned screen / film cassette and CR cassette, a plurality of radiation detection elements are arranged in a two-dimensional form (matrix), and each radiation detection element is irradiated through the subject. Development of a radiographic imaging device (flat panel detector, also referred to as a semiconductor image sensor) that generates a charge in accordance with the dose of radiation and reads the generated charge as a signal value is in progress. In addition, development of a portable radiographic imaging device (also referred to as an FPD cassette or the like) in which a sensor panel in which a plurality of radiation detection elements are arranged is housed in a housing is also in progress.

  Since such a portable radiographic imaging device has high portability, it can perform imaging in various usage modes. For this reason, it is more necessary to protect the internal configuration from moisture and dust than the stationary type. For example, in the radiographic imaging device of Patent Document 1, as shown in FIG. 14, a sealing material 103 is inserted at the boundary between the front plate 101 and the back plate 102 constituting the casing, Dust proof was intended.

JP2015-169592A

However, the portable radiographic imaging device may be dropped during transportation due to its high portability, and at the time of dropping, the floor surface from either one of the corners of the front plate or the back plate of the housing. There were many collisions.
Due to the impact force at the time of dropping, the front plate and the back plate are relatively displaced, and a shearing force is applied to the sealing material. In particular, energy is concentrated in the corner portion, so that the shearing force is likely to increase, and there is a possibility that the sealing performance may be impaired due to breakage, misalignment, peeling (when bonded), and the like.

As a countermeasure for this problem, a method of increasing the width of the sealing material (the width in the thickness direction of the side wall provided on the front plate or the back plate) can be considered. There is a problem that the internal volume of the housing is reduced and the imaging range of the radiographic image is also reduced with respect to the size of the housing.
In addition, when the width of the sealing material is widened, when the sealing material is sandwiched between the front plate and the back plate, the front plate or the back plate is bent by the elastic force of the sealing material, and a gap is generated, resulting in a sealing property. There was a risk of damage.

  The present invention has been made in view of the above problems, and provides a portable radiographic imaging device that effectively suppresses deformation and breakage, and is advantageous for cost reduction and weight reduction. With the goal.

The invention according to claim 1 is a portable radiographic imaging device,
A sensor panel in which a plurality of radiation detection elements are arranged two-dimensionally;
A housing in which the sensor panel is housed,
The housing is a portable radiographic imaging device having a front member on which radiation is incident and a back member on the opposite side of the front member,
A sealing material is provided between the front member and the back member;
The minimum value of the ratio of the width to the thickness after compression in the cross section of the corner portion of the sealing material located at the corner of the casing is the width relative to the thickness after compression in the cross section of the portion other than the corner portion of the sealing material. It is characterized by being larger than the minimum value of the ratio.

The invention according to claim 2 is the portable radiographic imaging device according to claim 1,
The minimum value of the ratio of the width to the thickness after compression in the cross section of the corner portion of the sealing material is 6 times or more.

The invention according to claim 3 is the portable radiographic imaging device according to claim 1 or 2,
The seal in a section in which the ratio of the width to the thickness after compression in the cross section of the portion other than the corner portion of the seal material is smaller than the minimum value of the ratio of the width to the thickness after compression in the cross section of the corner portion of the seal material. The continuous length in the direction along the material is 150 [mm] or less.

The invention according to claim 4 is a portable radiographic imaging device,
A sensor panel in which a plurality of radiation detection elements are arranged two-dimensionally;
A housing in which the sensor panel is housed,
The housing is a portable radiographic imaging device having a front member on which radiation is incident and a back member on the opposite side of the front member,
A sealing material is provided between the front member and the back member;
The minimum value of the width in the cross section of the corner portion of the sealing material is larger than the minimum value of the width in the cross section of the portion other than the corner portion of the sealing material.

The invention according to claim 5 is the portable radiographic imaging device according to claim 4,
The minimum value of the width in the cross section of the corner portion of the sealing material is 2 [mm] or more.

The invention according to claim 6 is the portable radiographic imaging device according to claim 4 or 5,
150 [mm] the continuous length in the direction along the sealing material in the section where the width in the cross section of the portion other than the corner of the sealing material is smaller than the minimum width in the cross section of the corner of the sealing material It is characterized by the following.

The invention according to claim 7 is the portable radiographic image capturing device according to any one of claims 1 to 6,
An insertion portion through which a fastening member that fastens the front member and the back member passes is provided in a portion other than the corner portion of the sealing material.

The invention according to claim 8 is the portable radiographic imaging device according to claim 7,
The insertion portion of the sealing material is characterized in that it is disposed 9 [mm] or more away from the outer surface of the corner portion of the casing closest to the insertion portion.

The invention according to claim 9 is the portable radiographic image capturing device according to any one of claims 1 to 8,
The exterior parts of the casing are arranged so as to avoid the corners of the sealing material.

The invention according to claim 10 is the portable radiographic image capturing device according to any one of claims 1 to 9,
A 25% compressive load in a direction in which the seal member is compressed by the front member and the back member is 0.25 [MPa] or less.

Invention of Claim 11 is a portable radiographic imaging device as described in any one of Claim 1 to 10,
The durometer hardness of the sealing material in a direction compressed by the front member and the back member is 30 degrees or less.

The invention according to claim 12 is the portable radiographic imaging device according to any one of claims 1 to 11,
The sealing material is a foam material having flexibility.

  As described above, the present invention can provide a radiographic imaging apparatus capable of protecting a sealing material and maintaining good sealing performance.

It is a block diagram showing the equivalent circuit of the portable radiographic imaging apparatus which concerns on embodiment of invention. It is a perspective view of a portable radiographic imaging device. It is sectional drawing of the portable radiographic imaging apparatus along the XX line of FIG. It is a top view of the corner | angular part of the front plate of a housing | casing. 5A is a cross-sectional view showing a cross section taken along the line YY of FIG. 4 of the casing, and FIG. 5B is a cross section showing a cross section taken along the line ZZ of FIG. FIG. 6A is an explanatory diagram showing the range of the corner of the packing when the corner is arcuate, and FIG. 6B is an explanation showing the range of the corner of the packing when the corner is bent. FIG. It is sectional drawing of the radiographic imaging apparatus which shows the thickness and width after compression of packing. It is a top view of the front board provided with exterior components. It is a figure which shows the result of the comparison test of packing. It is sectional drawing which showed the housing | casing of another shape. FIG. 11A and FIG. 11B are cross-sectional views illustrating other shapes of housings. 12A and 12B are cross-sectional views illustrating a housing having another shape. 13 (A) to 13 (D) are cross-sectional views showing other examples of packings having different cross-sectional shapes. It is sectional drawing which shows the housing | casing of the conventional radiographic imaging apparatus.

  Hereinafter, embodiments of a portable radiographic imaging device according to the present invention will be described with reference to the drawings.

  In the following, the portable radiographic image capturing device may be simply referred to as a radiographic image capturing device. In the following, a so-called indirect radiographic imaging apparatus that includes a scintillator or the like as a radiographic imaging apparatus and converts an emitted radiation into electromagnetic waves of other wavelengths such as visible light to obtain an electrical signal will be described. The present invention can also be applied to a so-called direct type radiographic imaging apparatus in which radiation is directly detected by a radiation detection element without using a scintillator or the like.

[Circuit configuration of radiation imaging equipment]
First, a circuit configuration and the like of the radiation image capturing apparatus 1 according to the present embodiment will be described. FIG. 1 is a block diagram showing an equivalent circuit of the radiation image capturing apparatus 1 according to the present embodiment. As shown in FIG. 1, in the radiographic imaging apparatus 1, a plurality of radiation detection elements 7 are arranged in a two-dimensional shape (matrix shape) on a sensor substrate 51 (described later, see FIG. 3).

  A bias line 9 is connected to each radiation detection element 7, and a reverse bias voltage is applied from a bias power supply 14 via the bias line 9 and their connection 10. Each radiation detection element 7 is connected to a TFT (Thin Film Transistor) 8 as a switch element, and the TFT 8 is connected to the signal line 6.

  In the scanning drive unit 15, the on-voltage and the off-voltage supplied from the power supply circuit 15 a via the wiring 15 c are switched by the gate driver 15 b and applied to the lines L 1 to Lx of the scanning line 5. Each TFT 8 is turned off when a turn-off voltage is applied via the scanning line 5, and the conduction between the radiation detection element 7 and the signal line 6 is interrupted to accumulate charges in the radiation detection element 7. . Further, when an on-voltage is applied via the scanning line 5, the on-state is turned on, and the charge accumulated in the radiation detection element 7 is discharged to the signal line 6.

  Each signal line 6 is connected to each readout circuit 17 in the readout IC 16. Then, in the process of reading the signal value D, when a turn-on voltage is applied from the gate driver 15b to the line L where the scanning line 5 is located, the TFT 8 is turned on, and the charge from the radiation detection element 7 is transferred to the TFT 8 and the signal line. 6 and flows into the readout circuit 17 and the amplifier circuit 18 outputs a voltage value corresponding to the amount of electric charge.

  A correlated double sampling circuit (indicated as “CDS” in FIG. 1) 19 reads out and outputs the voltage value output from the amplifier circuit 18 as an analog signal value D. As described above, in this embodiment, each readout circuit 17 of the readout IC 16 reads out the electric charge generated in each radiation detection element 7 as the signal value D in accordance with the dose of irradiated radiation.

  Then, the signal value D output from the amplifier circuit 18 is sequentially transmitted to the A / D converter 20 via the analog multiplexer 21, and is sequentially converted into a digital signal value D by the A / D converter 20, and stored. The data are sequentially stored in the means 23. In the present embodiment, the signal is transmitted from all the radiation detection elements 7 by performing the above-described readout process while sequentially applying the on-voltage from the gate driver 15b of the scanning drive unit 15 to each of the lines L1 to Lx of the scanning line 5. The value D is read out.

  The control means 22 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface, etc., connected to the bus, an FPGA (Field Programmable Gate Array), etc. Has been. It may be configured by a dedicated control circuit.

  The control means 22 is connected to a storage means 23 composed of SRAM (Static RAM), SDRAM (Synchronous DRAM), NAND flash memory or the like, and a built-in power supply 24 composed of a lithium ion capacitor or the like. The control unit 22 is connected to a communication unit 30 for performing communication with the outside by a wireless method or a wired method via the antenna 29 or the connector 27 described above.

  Further, as described above, the control unit 22 controls the application of the reverse bias voltage from the bias power supply 14 to each radiation detection element 7 and controls the operation of the scanning drive unit 15 and the readout circuit 17 to The signal value D from the radiation detection element 7 is read out, the read signal value D is stored in the storage unit 23, or the stored signal value D is stored via the communication unit 30. Control such as transferring to the outside is performed.

[Configuration of portable radiographic imaging device]
FIG. 2 is a perspective view showing a configuration of the portable radiographic imaging apparatus 1 according to the present embodiment, and FIG. 3 is a cross-sectional view of the portable radiographic imaging apparatus 1 taken along line XX in FIG. In FIG. 3, the thickness in the vertical direction is made larger than the actual thickness in order to make the internal configuration easy to understand.
As shown in FIG. 3, the radiographic image capturing apparatus 1 is configured by housing a sensor panel SP (also referred to as a TFT panel or the like) in a housing 40. In FIG. 3, the radiographic imaging device 1 is shown in a state where the radiation incident plate 415 irradiated with radiation is arranged on the lower side in the drawing. In the following, the vertical direction of the radiographic image capturing apparatus 1 will be described based on the case where the radiographic image capturing apparatus 1 is arranged in the state shown in FIG.

  In the present embodiment, the housing 40 of the radiographic imaging apparatus 1 mainly includes a radiation incident plate 415 formed in a substantially rectangular flat plate shape and side wall portions 416 erected on the outer peripheral edges of the four sides. A back as a back member having a front plate 41 as a front member, a bottom plate 425 formed in a substantially rectangular flat plate shape facing the radiation incident plate 415, and side wall portions 426 erected on the outer peripheral edges of the four sides thereof The plate 42 is formed.

In this embodiment, the front plate 41 is made of, for example, fiber reinforced plastic, more preferably CFRP (Carbon Fiber Reinforced Plastics), and the radiation incident plate 415 and the side wall portion 416 are integrally formed by autoclaving or hot pressing. Is formed.
The back plate 42 is made of, for example, a metal having high specific strength or heat dissipation, specifically, a magnesium alloy (for example, AZ31 plate for pressing), and the bottom plate 425 and the side wall portion 426 are integrally formed by pressing. Is formed. The back plate 42 may be made of an aluminum alloy (for example, A5052) or CFRP.

Further, the back plate 42 is attached to a support column 44 erected from the side wall portion 416 of the front plate 41 or a base 50 (described later) of the sensor panel SP toward the back plate 42 by screws 43 as fastening members. ing. The back plate 42 is coupled to the front plate 41 and has a rectangular box shape when viewed from above and below.
In addition, a packing 63 as a sealing material is inserted between the back plate 42 and the front plate 41 to ensure the airtightness and watertightness inside the housing 40.

  On the other hand, in the present embodiment, the sensor panel SP is formed as follows. Unless otherwise specified, in the case 40, the back plate 42 side is defined as the upper portion and the front plate 41 side is defined as the lower portion, and the vertical direction defined by these may also be referred to as the thickness direction. To do.

  The sensor panel SP includes a base 50 having a metal layer (not shown) such as lead that shields radiation. A sensor substrate 51 made of a glass substrate or the like is disposed on the lower surface side of the base 50. On the lower surface side of the sensor substrate 51, the plurality of radiation detection elements 7 and the like described above are arranged two-dimensionally.

  A scintillator 55 is formed on one surface of the scintillator substrate 54 formed of a glass substrate or the like. In the present embodiment, the sensor substrate 51 and the scintillator substrate 54 are disposed so that the scintillator 55 and each radiation detection element 7 face each other, and the sensor substrate 51 is disposed outside the radiation detection elements 7, the scintillator 55, and the like. And the scintillator substrate 54 are attached with an adhesive (not shown).

  A signal line 6 (see FIG. 1) or the like wired on the sensor substrate 51 is connected to a flexible circuit board 56 in which a chip such as a readout IC 16 is incorporated on a film. It is drawn to the upper surface side of the base 50 and connected to the PCB substrate 57 and the like.

  The PCB substrate 57 is provided with circuits such as the control means 22 and the storage means 23 (see FIG. 1) and electronic members (hereinafter collectively referred to as electronic equipment 58). 3 illustrates a state in which the electronic device 58 is disposed on the lower surface side of the PCB substrate 57, the electronic device 58 is disposed on the upper surface side of the PCB substrate 57 (or on both the lower surface side and the upper surface side). You may arrange.

  In the radiographic image capturing apparatus 1 according to the present embodiment, the sensor panel SP is formed as described above. Since the electronic device 58 is disposed on the upper surface side of the sensor panel SP, that is, on the back plate 42 side, the electronic device 58 is simply removed (that is, without removing the sensor panel SP from the housing 40). The electronic device 58 can be easily exchanged.

  Further, as shown in FIG. 3, a spacer 60 is disposed between the scintillator substrate 54 and the front plate 41. In the present embodiment, a heat conducting member 61 is disposed between the readout IC 16 and the back plate 42, and heat generated by the readout IC 16 is conducted to the back plate 42 side from the back plate 42 to the outside of the apparatus. To dissipate heat. Further, a heat insulating member 62 is disposed between the readout IC 16 and the base 50 of the sensor panel SP so as to prevent heat generated by the readout IC 16 from being transmitted to the sensor panel SP side.

[Detailed structure of packing]
Next, the structure of the housing 40 and the packing 63 will be described in detail with reference to FIGS. 4 is a plan view of the corner portion of the front plate 41 of the housing 40 as viewed from above, and FIG. 5 is a cross-sectional view along the radiation incident direction (direction perpendicular to the radiation incident plate 415) at the outer edge of the housing 40. 5A is a cross-sectional view showing only a cross section along line YY in FIG. 4, and FIG. 5B is a cross-sectional view showing only a cross section along line ZZ in FIG. is there.

As described above, the front plate 41 of the housing 40 has the side wall portions 416 erected along the outer edge of the rectangular radiation incident plate 415, that is, along the four sides of the rectangle, and the adjacent side wall portions 416 are adjacent to each other. It is connected at the corner.
As shown in FIG. 5 (A), a drop portion 416a is formed at the upper end portion of each side wall portion 416. The drop portion 416a is lower by one step on the outer edge side over the entire circumference of the four side wall portions 416. The side wall portion 426 of the back plate 42 is fitted into the drop portion 416a.

  Further, a packing 63 following the shape of the upper end surface 416b is mounted on the upper end surface 416b (excluding the drop portion 416a) of the four side wall portions 416 over the entire circumference of the four side wall portions 416. ing. That is, the packing 63 has a shape that follows the shape of the upper end surface 416b of the side wall portion 416 having four sides, and is formed in a rectangular shape having a large opening at the center in plan view.

The packing 63 is rectangular in cross section cut by a cross section perpendicular to the direction along the side wall portion 416, and is formed of urethane foam or the like which is a flexible foam material. Urethane foam is used that has high waterproofness and low resilience, and a 25% compressive load in the thickness direction described below is 0.25 [MPa] or less. The definition of 25% compressive load follows the definition of JISK6245 “Vulcanized rubber and thermoplastic rubber, Determination of stress-strain characteristics”.
As a measure of the repulsive force of the packing 63, one having a durometer hardness of 30 degrees or less in the thickness direction to be described later may be used, or one satisfying both the compressive load and the durometer hardness may be used. You may do it. The durometer hardness is in accordance with JIS K6253-3 “Vulcanized rubber and thermoplastic rubber, Determination of hardness, Part 3 Durometer hardness”.

Although there is no limitation in the formation method of the packing 63, here, the case where it shape | molds so that it may become the punching of a sheet material and the set whole shape may be illustrated.
Further, the packing 63 may not be bonded to either the front plate 41 or the back plate 42, but is desirably bonded to one or both of the front plate 41 and the back plate 42. Here, the case where the packing 63 is bonded only to the upper end surface 416b side of the side wall portion 416 is illustrated.

Here, the range of the corner 631 of the packing 63 is defined as follows. The packing 63 includes a portion (a portion 632 other than the corner portion) that extends straight along the longitudinal direction of each side wall portion 416 (direction of any of the four sides of the rectangular housing 40) and two adjacent corner portions. The corner portion 631 intersects the portion 632.
As shown in FIG. 6A, when the inner edge at the corner is formed in an arc shape, one boundary point p1 between the straight extending portion of the packing 63 and the curved portion in the arc shape. 90 ° between the straight line l1 that connects the center point of the arc of the inner edge and the reference point c and the straight line l2 that connects the other boundary point p2 and the reference point c to the corner 631 To do.

  As shown in FIG. 6B, when the inner edge at the corner of the packing 63 is not a circular arc shape but is bent at a right angle, the vertex bent at a right angle at the inner edge is a reference point. c, a straight line l1 along the longitudinal direction of one straight portion 632 extending to the corner 631 passing through the reference point c, and the other straight portion 632 passing through the reference point c to the corner 631. A corner portion 631 is defined as a range of 90 ° between the straight line l2 along the longitudinal direction.

  In the packing 63, the minimum value of the ratio of the width to the thickness after compression in the cross section of the corner 631 is larger than the minimum value of the ratio of the width to the thickness after compression in the cross section of the portion 632 other than the corner of the packing 63. The minimum value of the ratio of the width to the thickness after compression in the cross section of the corner 631 of the packing 63 is 6 times or more.

“Thickness after compression” is the thickness in the vertical direction when the packing 63 is compressed and held between the front plate 41 and the back plate 42 (reference symbol t in FIG. 7), and “width” is the thickness of the packing 63. It means the full width in the horizontal direction from the inside to the outside (symbol w in FIG. 7).
As described above, the packing 63 is sandwiched between the front plate 41 and the back plate 42 in a compressed state, and the thickness after compression is the same as that of the corner 631 and the portion 632 other than the corner. It becomes equal to the height of the seat part 413 to which 43 is attached.

Therefore, “the minimum value of the ratio of the width to the thickness after compression in the cross section of the portion 632 other than the corner” is orthogonal to the vertical direction and the longitudinal direction of the packing 63 at each position of the entire length of the portion 632 other than the corner. With respect to the direction, the narrowest width is divided by the thickness of the packing 63 (height of the seat portion 413).
For example, as shown in FIG. 4, when an insertion portion 633 of a screw 43 described later is formed in a portion 632 other than the corner portion of the packing 63, the packing 63 at a position passing through the insertion portion 633. Can be the “minimum value of the ratio of the width to the compressed thickness in the cross section of the portion 632 other than the corners of the packing 63”.

The “minimum value of the ratio of the width to the thickness after compression in the cross section of the corner portion 631” is the thickness of the packing 63 that is the narrowest width in the horizontal direction and the direction across the packing 63 in the corner portion 631 ( The value is divided by the height of the seat portion 413.
For example, as shown in FIG. 4, when a threaded recess 634 is formed at the center of the outer edge of the corner 631 of the packing 63, the packing 63 at a position that passes through the recess 634. The value obtained by dividing the width by the thickness after compression (height of the seat portion 413) can be “the minimum value of the ratio of the width to the thickness after compression in the cross section of the corner portion 631 of the packing 63”.

  In this manner, the value of “the minimum value of the ratio of the width to the compressed thickness in the cross section of the corner 631 of the packing 63” is set to the “width to the compressed thickness in the cross section of the portion 632 other than the corner of the packing 63”. By setting the value larger than the “minimum value of the ratio”, it is possible to suppress the occurrence of breakage, misalignment, peeling, and the like of the packing 63 in the corner portion 631 where a large impact force is easily applied when the radiation imaging apparatus 1 is dropped. .

Furthermore, the value of “the minimum value of the ratio of the width to the thickness after compression in the cross section of the corner 631 of the packing 63” is set to be 6 times or more. That is, at least the minimum “width in the cross section of the corner 631 of the packing 63” is set to at least six times the “thickness after compression in the cross section of the corner 631 of the packing 63”. 5 and 7, the thickness of the packing 63 is shown to be thicker than actual.
As described above, since the width is relatively wider than the thickness of the packing 63, it is possible to suppress the occurrence of the collapse in addition to the fracture, the positional deviation, and the separation.

The packing 63 is formed with a concave insertion portion 633 for inserting a screw 43 that fastens the front plate 41 and the back plate 42 of the housing 40. The insertion portion 633 is formed of the packing 63. It is formed outside the range of the corner 631, that is, at a portion 632 other than the corner, which is separated from the corner 631 by a predetermined length or more.
More specifically, as shown in FIG. 4, the insertion portion 633 is formed of the front plate 41 of the housing 40 closest to the insertion portion 633 in the longitudinal direction of the portion 632 other than the corner portion where the insertion portion 633 is formed. The distance d from the outer surface of the side wall portion 416 connected to the corner portion is set to be 9 [mm] or more. The same applies to the other insertion portions 633.
The presence of the insertion portion 633 may reduce the strength of the packing 63 by narrowing the width of the packing 63 to break, misalignment, peeling, falling, etc., but since the impact at the time of dropping is formed away from the large corner portion 631, Occurrence of breakage, misalignment, peeling, falling, etc. when subjected to an impact can be reduced.

  The corner 631 of the packing 63 is formed with a recess 634 that is protected by a screw. The screw 451 has a block 45 formed of a separate member from the front plate 41 at the corner of the front plate 41. It is a screw for fixing, and is not a fastening member for fastening the front plate 41 and the back plate 42. The fastening member for fastening the front plate 41 and the back plate 42 is preferably arranged as close to the center in the width direction of the packing 63 as possible in order to achieve good fastening, but a screw for fixing the block 45 Since there is no such necessity, the concave portion 634 is not deeply cut like the insertion portion 633, and the concave portion 634 is not a target to be disposed at a predetermined length or more away from the corner portion 631. .

Further, as shown in FIG. 8, exterior parts 47 such as an operation panel, an external connector, an antenna, an indicator and the like are provided on the side surface portion (side wall portion 416 of the front plate 41) of the housing 40 (in FIG. 8, the connector is a connector). For example).
When such an exterior component 47 is equipped, the upper end surface 416b of the side wall portion 416 is greatly cut out in the width direction, and therefore the exterior component 47 is arranged to belong to the portion 632 other than the corner portion.
Further, due to the presence of the exterior component 47, the ratio of the width to the compressed thickness in the cross section of the portion 632 other than the corner portion of the packing 63 is “the minimum ratio of the width to the compressed thickness in the cross section of the corner portion 631 of the packing 63”. A section k that is smaller than “value” occurs continuously for a long time in the longitudinal direction of the portion 632 other than the corner portion of the packing 63.
However, the length in the longitudinal direction of the portion 632 other than the corner portion of the section k also does not occur in the portion 632 other than the corner portion of the packing 63 so as not to reduce the strength related to breakage, misalignment, separation, collapse, and the like. It is set to be 150 [mm] or less.
In addition, the ratio of the width to the thickness after compression in the cross section of the entire portion 632 other than the corner portion of the packing 63 is not limited to the above-described connector, and the “width relative to the thickness after compression in the cross section of the corner portion 631 of the packing 63” The continuous length of the section smaller than the “minimum value of the ratio” is set to be 150 [mm] or less.

[Technical effects of the embodiment of the invention]
As described above, the radiographic image capturing apparatus 1 is provided with the packing 63 between the front plate 41 and the back plate 42 of the housing 40, and “the ratio of the width to the thickness after compression in the cross section of the corner portion 631 of the packing 63. The value of “minimum value” is set larger than “the minimum value of the ratio of the width to the thickness after compression in the cross section of the portion 632 other than the corner portion of the packing 63”.
Thereby, in the corner | angular part 631 where a big impact force is easy to apply at the time of fall of the radiographic imaging apparatus 1, generation | occurrence | production of the fracture | rupture of a packing 63, position shift, peeling of adhesion, a fall, etc. can be suppressed, and a sealing performance is maintained high. It becomes possible.
Also, since the minimum value of the ratio of the width of the corner 631 to the thickness after compression of the corner 631 is larger than that of the portion 632 other than the corner, unlike the case where the ratio is increased for the entire packing 63, the housing 40 The reduction of the imaging range of the radiographic image due to the reduction of the internal volume of the housing can be suppressed, and it is possible to avoid the reduction of the sealing performance due to the case 40 being bent by pushing against the elastic force of the packing 63. Become.

Furthermore, the packing 63 is set so that the value of “the minimum value of the ratio of the width to the thickness after compression in the cross section of the corner 631 of the packing 63” is 6 times or more.
Here, based on FIG. 9, the results of the impact resistance test using three types of packings having different widths, thicknesses after compression, and width ratios will be described.

The upper stage in FIG. 9 is a packing as a comparative example having a thickness after compression of 0.35 [mm] and a width of 1.8 [mm], and the ratio is 5.1 (<6).
The middle stage in FIG. 9 is a packing as an example in which the overall thickness after compression is 0.35 [mm], the width is 2.3 [mm], and the ratio is 6.6 (> 6). This width 2.3 [mm] matches the minimum width at the corner 631 of the packing 63.
The lower part in FIG. 9 is a packing as an example in which the overall thickness after compression is 0.35 [mm], the width is 5.95 [mm], and the ratio is 17.1 (> 6). This width 5.95 [mm] coincides with the maximum width at the corner 631 of the packing 63.

As a result of mounting the respective packings on the casing 40 and performing an impact test by dropping a plurality of times, in the comparative example shown in the upper part of FIG. 9, the packing was frequently broken, misaligned, peeled, or collapsed.
On the other hand, in the embodiment in the middle and lower stages of FIG. 9, there is little or no breakage, misalignment, peeling, or collapse of the packing, and “the minimum value of the ratio of the width to the thickness after compression” of the packing. It was confirmed that the durability by impact force was sufficiently obtained with respect to the packing by making the value of 6 or more.
Therefore, also in the case of the packing 63 provided in the housing 40, the impact force can be increased by setting the value of “the minimum value of the ratio of the width to the compressed thickness in the cross section of the corner 631 of the packing 63” to 6 times or more. It is possible to sufficiently improve the durability of corners that are susceptible to damage.

In addition, since the insertion portion 633 through which the screw 43 that fastens the front plate 41 and the back plate 42 passes is provided in the portion 632 other than the corner portion of the seal material 63, the influence of the width reduction due to the formation of the insertion portion 633 is an angle. It is possible not to reach the portion 631 directly, and the impact resistance of the packing 63 can be further improved.
In particular, when the insertion portion 633 is separated from the outer surface of the corner portion of the nearest housing 40 by 9 mm or more, the influence on the corner portion 631 is more effectively reduced and the impact resistance of the packing 63 is improved. Can be made.

Further, a section k in which the ratio of the width to the thickness after compression in the cross section of the portion 632 other than the corner portion of the packing 63 is smaller than the minimum value of the ratio of the width to the thickness after compression in the cross section of the corner portion 631 of the packing 63. The length in the direction along the packing 63 is 150 [mm] or less.
For this reason, it is possible to suppress a decrease in strength against breakage, misalignment, separation, collapse, and the like of the portion 632 other than the corner portion of the packing 63, and to suppress a decrease in sealing performance at a portion other than the corner portion of the housing 40 against impact. I am trying.

  Further, since the exterior part 47 of the housing 40 is arranged so as to avoid the corner part 631 of the packing 63, the influence of the width reduction of the packing 63 for avoiding the exterior part 47 does not directly affect the corner part 631. The impact resistance of the packing 63 can be further improved.

In addition, the 25% compression load in the compression direction of the packing 63 is 0.02 [MPa] or more and 0.25 [MPa] or less, or the durometer hardness is 3 degrees or more and 30 degrees or less, It is possible to suppress the repulsive force against the compression of the packing 63 and reduce the occurrence of a decrease in sealing performance due to the gap of the housing 40 or the like.
Further, since the packing 63 is formed of a foam material having flexibility, it is possible to further suppress the repulsive force of the packing 63 and reduce the occurrence of deterioration of the sealing performance.

[Other examples of packing strength]
The packing 63 has a corner portion 631 and a portion 632 other than the corner portion to define the relationship of the minimum value of the ratio of the width to the thickness after compression in the cross section, and the adverse effects of the strength regarding impact resistance and the repulsive force of the packing 63 However, it is not limited to this.
For example, by making the minimum value of the width of the cross section of the corner portion 631 of the packing 63 larger than the minimum value of the width of the cross section of the portion 632 other than the corner portion of the sealing material 63, It is possible to obtain the same technical effect as when the ratio is defined.

In this case, as can be seen from the comparison of FIG. 9 described above, it is desirable that the minimum value of the width in the cross section of the corner 631 of the packing 63 be 2 [mm] or more.
Further, the length in the direction along the packing 63 of the section where the width in the cross section of the portion 632 other than the corner portion of the packing 63 is smaller than the minimum value of the width in the cross section of the corner portion 631 of the packing 63 is 150 [mm]. The following is desirable. Also in this case, it is possible to suppress a decrease in strength of the portion 632 other than the corner portion of the packing 63 and to suppress a decrease in sealing performance of a portion other than the corner portion of the housing 40 against an impact.

[Other examples of chassis]
The shape and structure of the housing 40 of the radiographic imaging device 1 are not limited to those described above, and the packing 63 can be applied to any type of housing that compresses and holds the packing 63. Another example is described below. In the following description, the same components as those of the housing 40 are denoted by the same reference numerals and description thereof is omitted.

For example, although the case where the back plate 42 of the housing 40 has the side wall portion 426 is illustrated, as shown in FIGS. 10A and 10B, the flat plate 42A having no side wall portion 426 is provided. The packing 63 may be mounted on the housing 40A having the above. In this case, the drop portion 416a is not formed on the front plate 41A side.
Further, as shown in FIGS. 11A and 11B, the housing 40 </ b> A protrudes from the upper end surface 416 b of the side wall portion 416 of the front plate 41 and has a protruding portion 418 </ b> A surrounding the outer edge portion of the back plate 42. It is good also as a structure to have.
Although not shown, the front plate 41 may not have the side wall portion 416 and only the back plate 42 may have the side wall portion 426.

Further, as shown in FIGS. 12A and 12B, a packing 63 may be provided on a housing 40B having a back plate 42B in which a side wall 426B extends to the lower end of the housing 40B. . In this case, the drop portion 416a is not formed on the front plate 41B side.
In this case 40B, since the side wall portion 426B of the back plate 42B extends downward, a horizontal screw 43 is provided outside the side wall portion 426B, and passes through the side wall portion 426B of the back plate 42B. Since it can fasten to the screw hole formed in the side wall part 416B of the plate 41B, it is not necessary to provide the seat part 413 on the upper end surface 416b of the side wall part 416B. Therefore, it is not necessary to form the insertion portion 633 in the packing 63, and the strength of the packing 63 can be improved.

[Other examples of packing]
The cross-sectional shape of the packing as the sealing material is not limited to a solid rectangular shape like a packing 63 as shown in FIG.
For example, as shown in a packing 63A in FIG. 13A, the corners of one end (in this example, the upper end) of a rectangle having a cross-sectional shape may be rounded in an arc shape.
Further, as shown in a packing 63B in FIG. 13B, the cross-sectional shape may be triangular. Further, if the front plate 41 is not bonded, the cross section may be circular, oval, or polygonal.
Moreover, as shown in packing 63C of FIG. 13 (C), the inside may be hollow. In this case, the external cross-sectional shape is not limited to FIG. 13A, and may be a triangular shape, a circular shape, an oval shape, or a polygonal shape.
Further, as shown in packing 63D in FIG. 13D, the inside may be hollow, and the inside may be opened to one side without being sealed. In this case as well, the external cross-sectional shape may be triangular, circular, oval, or polygonal.
In these cases, the width in the cross section of the packing is the widest portion in the horizontal direction. In any case, the thickness after compression in the cross section of the packing is the thickness in a state where the packing is compressed and installed.

  Moreover, even when the packing has a cross-sectional shape as shown in FIGS. 13A to 13D, the minimum value of the ratio of the width to the thickness after compression in the cross-section of the corner portion of the sealing material and other than the corner portion Relationship between the ratio of the ratio of the width to the thickness after compression in the section of the part, the relationship between these minimum widths, the arrangement of the insertion part 633, the arrangement of the exterior parts, the 25% compressive load and durometer hardness of the packing, the packing material Is the same as the packing 63 described above.

[Others]
The packing 63 has a minimum value of the ratio of the width to the thickness after compression in the cross section of the corner portion of the sealing material and the ratio of the width to the thickness after compression in the cross section of the portion other than the corner for all four corner portions 631. It is desirable to set the above-described setting contents for the various settings of the packing 63 referred to in the embodiment, such as the relationship with the minimum value of these, the relationship between these minimum widths, the arrangement of the insertion portion 633, the arrangement of the exterior parts, and the like. The contents described above may be applied to only some corners 631.

  Moreover, although the case where the packing 63 has a uniform thickness as a whole is illustrated, the width relative to the thickness after compression in the cross section of the corner portion of the sealing material is not limited to this. The relationship between the minimum value of the ratio and the minimum value of the ratio of the width to the compressed thickness in the cross section of the portion other than the corner, the relationship between these minimum widths, the arrangement of the insertion part 633, the arrangement of the exterior parts, etc. The various settings of the packing 63 mentioned in the form are preferably set as described above.

Further, the packing is not limited to a waterproof purpose, but may be made of a material that is exclusively suitable for a dust-proof purpose.
Needless to say, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist of the present invention.

1 Radiographic imaging device (portable radiographic imaging device)
40, 40A, 40B Housing 41, 41A, 41B Front plate (front member)
413 Seat part 415 Radiation incidence plate 416, 416B Side wall part 416a Head part 416b Upper end surface 42, 42A, 42B Back board (back member)
425 Bottom plate 426, 426B Side wall 43 Screw (fastening member)
47 Exterior parts 63, 63A, 63B, 63C, 63D Packing (seal material)
631 Corner portion 632 Portion other than corner portion 633 Insertion portion 634 Recess
c Reference point
d Distance k section
l1, l2 straight line
p1, p2 boundary point SP sensor panel t thickness after compression w width

Claims (12)

A sensor panel in which a plurality of radiation detection elements are arranged two-dimensionally;
A housing in which the sensor panel is housed,
The housing is a portable radiographic imaging device having a front member on which radiation is incident and a back member on the opposite side of the front member,
A sealing material is provided between the front member and the back member;
The minimum value of the ratio of the width to the thickness after compression in the cross section of the corner portion of the sealing material located at the corner of the casing is the width relative to the thickness after compression in the cross section of the portion other than the corner portion of the sealing material. A portable radiographic imaging device characterized by being larger than the minimum value of the ratio.   The portable radiographic image capturing apparatus according to claim 1, wherein a minimum value of a ratio of a width to a thickness after compression in a cross section of a corner portion of the sealing material is 6 times or more. The seal in a section in which the ratio of the width to the thickness after compression in the cross section of the portion other than the corner portion of the seal material is smaller than the minimum value of the ratio of the width to the thickness after compression in the cross section of the corner portion of the seal material. The portable radiographic imaging device according to claim 1 or 2, wherein a length continuous in a direction along the material is 150 mm or less. A sensor panel in which a plurality of radiation detection elements are arranged two-dimensionally;
A housing in which the sensor panel is housed,
The housing is a portable radiographic imaging device having a front member on which radiation is incident and a back member on the opposite side of the front member,
A sealing material is provided between the front member and the back member;
A portable radiographic imaging device, wherein a minimum value of a width of a cross section of a corner portion of the sealing material is larger than a minimum value of a width of a cross section of a portion other than the corner portion of the sealing material.   The portable radiographic image capturing apparatus according to claim 4, wherein a minimum value of a width in a cross section of a corner portion of the sealing material is 2 [mm] or more.   150 [mm] the continuous length in the direction along the sealing material in the section where the width in the cross section of the portion other than the corner of the sealing material is smaller than the minimum width in the cross section of the corner of the sealing material The portable radiographic image capturing device according to claim 4 or 5, wherein:   The insertion part through which the fastening member which fastens the said front member and the said back member passes is provided in parts other than the corner | angular part of the said sealing material, The Claim 1 characterized by the above-mentioned. Portable radiographic imaging device.   The portable radiographic imaging device according to claim 7, wherein the insertion portion of the sealing material is disposed 9 mm or more away from an outer surface of a corner portion of the casing closest to the insertion portion. .   The portable radiographic imaging device according to any one of claims 1 to 8, wherein an exterior part of the casing is disposed so as to avoid the corner portion of the sealing material.   The 25% compressive load in the direction compressed by the front member and the back member of the sealing material is 0.25 [MPa] or less. Portable radiographic imaging device.   The portable radiographic image according to any one of claims 1 to 10, wherein a durometer hardness of the sealing material in a direction compressed by the front member and the back member is 30 degrees or less. Shooting device.   The portable radiographic imaging device according to claim 1, wherein the sealing material is a foam material having flexibility.

Images