JP6812759B2 - Portable radiation imaging device - Google Patents

Description

The present invention relates to a portable radiographic imaging apparatus.

Conventionally, a CR (Computed Radiography) cassette containing a luminescent phosphor sheet that stores the energy of radiation transmitted through a subject has been widely used as a device used for radiographing for the purpose of diagnosing a disease.
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 shape (matrix shape), and each radiation detection element transmits and irradiates the subject. Development of a radiation imaging device (flat panel detector, also referred to as a semiconductor image sensor) that generates a charge according to the dose of the radiation and reads out the generated charge as a signal value is in progress. Further, development of a portable radiation 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 underway.

Since such a portable radiographic imaging device is highly portable, it can be used in various usage modes. Therefore, it is more necessary to protect the internal configuration from moisture and dust than the stationary type. For example, in the radiation imaging apparatus 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 housing, and the inside of the housing is waterproofed. It was dustproof.

JP 2015-169592

However, since the portable radiographic imaging device is highly portable, it may be dropped during transportation, and when it is dropped, the floor surface may be dropped from either the corner of the front plate or the corner of the back plate of the housing. Often collided with.
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, since energy is concentrated on the corners, the shearing force tends to increase, which may cause breakage, misalignment, peeling (when adhered), and the like, resulting in impaired sealing performance.

As a countermeasure for this problem, a method of widening the width of the sealing material (width in the thickness direction of the side wall provided on the front plate or the back plate) can be considered, but in order to widen the width of the sealing material, the thickness of the side wall is also considered. There is a problem that the thickness must be increased, the internal volume of the housing is reduced, and the imaging range of the radiation image is also reduced with respect to the size of the housing.
Further, if 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 pushed by the elastic force of the sealing material to cause bending, and a gap is generated to improve the 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 apparatus that effectively suppresses deformation and breakage, and is also advantageous in cost reduction and weight reduction. With the goal.

The invention according to claim 1 is a portable radiographic imaging apparatus.
A sensor panel in which multiple radiation detection elements are arranged two-dimensionally,
A housing in which the sensor panel is housed is provided.
The housing is a portable radiographic imaging apparatus having a front member on the side where radiation is incident and a back member on the side opposite to 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 post-compressed thickness in the cross section of the corner of the sealing material located at the corner of the housing is the width to the post-compressed thickness in the cross section of the portion other than the corner of the sealing material. It is characterized in that it is larger than the minimum value of the ratio.
However, the range of the corner portion of the sealing material is defined by the center of the arc shape when the inner edge portion of the corner portion has an arc shape, and is bent when the inner edge portion of the corner portion has a bent shape. The apex is used as a reference point, and the range is defined as a range sandwiched between two lines that pass through the reference point and are perpendicular to two adjacent sides with the corner portion in between.

The invention according to claim 2 is the portable radiographic imaging apparatus 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 apparatus according to claim 1 or 2.
The seal in a section where the ratio of the width to the post-compressed thickness in the cross section of the portion other than the corner of the sealing material is smaller than the minimum value of the ratio of the width to the post-compressed thickness in the cross section of the corner of the sealing material. It is characterized by having a continuous length of 150 [mm] or less in the direction along the material.

The invention according to claim 4 is a portable radiographic imaging apparatus.
A sensor panel in which multiple radiation detection elements are arranged two-dimensionally,
A housing in which the sensor panel is housed is provided.
The housing is a portable radiographic imaging apparatus having a front member on the side where radiation is incident and a back member on the side opposite to 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.
However, the range of the corner portion of the sealing material is defined by the center of the arc shape when the inner edge portion of the corner portion has an arc shape, and is bent when the inner edge portion of the corner portion has a bent shape. The apex is used as a reference point, and the range is defined as a range sandwiched between two lines that pass through the reference point and are perpendicular to two adjacent sides with the corner portion in between.

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

The invention according to claim 7 is the portable radiographic imaging apparatus according to any one of claims 1 to 6.
It is characterized in that an insertion portion through which a fastening member for fastening the front member and the back member passes is provided at a portion other than the corner portion of the sealing material.

The invention according to claim 8 is the portable radiographic imaging apparatus according to claim 7.
The insertion portion of the sealing material is characterized in that it is arranged at a distance of 9 [mm] or more from the outer surface of the corner portion of the housing closest to the insertion portion.

The invention according to claim 9 is the portable radiographic imaging apparatus according to any one of claims 1 to 8.
The exterior parts of the housing are arranged so as to avoid the corners of the sealing material.

The invention according to claim 10 is the portable radiographic imaging apparatus according to any one of claims 1 to 9.
The 25% compressive load in the direction of being compressed by the front member and the back member of the sealing material is 0.25 [MPa] or less.

The invention according to claim 11 is the portable radiographic imaging apparatus according to any one of claims 1 to 10.
It is characterized in that the durometer hardness in the direction of being compressed by the front member and the back member of the sealing material is 30 degrees or less.

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

As described above, the present invention makes it possible to provide a radiographic imaging apparatus capable of protecting the sealing material and maintaining good sealing properties.

It is a block diagram which shows the equivalent circuit of the portable radiation imaging apparatus which concerns on embodiment of an invention. It is a perspective view of the portable radiation imaging apparatus. It is sectional drawing of the portable radiation imaging apparatus along the X-ray of FIG. It is a top view of the corner part of the front plate of a housing. 5 (A) is a cross-sectional view showing a cross section of the housing along the YY line of FIG. 4, and FIG. 5 (B) is a cross-sectional view of the housing along the ZZ line of FIG. It is a figure. FIG. 6A is an explanatory diagram showing the range of the corners of the packing when the corners are arcuate, and FIG. 6B is an explanatory view showing the range of the corners of the packing when the corners are bent. It is a figure. It is sectional drawing of the radiation imaging apparatus which shows the thickness and width after compression of a packing. It is a top view of the front plate provided with exterior parts. It is a figure which shows the result of the comparative test of packing. It is sectional drawing which showed the housing of another shape. 11 (A) and 11 (B) are cross-sectional views showing housings having other shapes. 12 (A) and 12 (B) are cross-sectional views showing housings having other shapes. 13 (A) to 13 (D) are cross-sectional views showing another example of packing having a different cross-sectional shape. It is sectional drawing which shows the housing of the conventional radiation imaging apparatus.

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

In the following, the portable radiographic imaging apparatus may be simply referred to as a radiographic imaging apparatus. Further, in the following, as a radiation imaging device, a so-called indirect type radiation imaging device equipped with a scintillator or the like and converting emitted radiation into electromagnetic waves of other wavelengths such as visible light to obtain an electric signal will be described. The present invention can also be applied to a so-called direct radiation imaging apparatus that directly detects radiation with a radiation detecting element without using a scintillator or the like.

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

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

Further, in the scanning drive means 15, the on voltage and the off voltage supplied from the power supply circuit 15a via the wiring 15c are switched by the gate driver 15b and applied to the lines L1 to Lx of the scanning line 5. Then, each TFT 8 is turned off when an off voltage is applied via the scanning line 5, cuts off the conduction between the radiation detection element 7 and the signal line 6, and accumulates electric charges in the radiation detection element 7. .. Further, when an on-voltage is applied through the scanning line 5, the on-state is turned on, and the electric charge accumulated in the radiation detection element 7 is discharged to the signal line 6.

Each signal line 6 is connected to each read circuit 17 in the read IC 16. Then, when an on-voltage is applied from the gate driver 15b to the line L having the scanning line 5 during the reading process of the signal value D, the TFT 8 is turned on, and the electric charge from the radiation detection element 7 is charged to the TFT 8 or the signal line. It flows into the read circuit 17 via No. 6, and the amplifier circuit 18 outputs a voltage value corresponding to the amount of the flowed electric charge.

The correlated double sampling circuit (described as “CDS” in FIG. 1) 19 reads out the voltage value output from the amplifier circuit 18 as an analog signal value D and outputs the voltage value. As described above, in the present embodiment, each read circuit 17 of the read IC 16 reads the electric charge generated in each radiation detection element 7 as a signal value D according to the dose of the 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 the digital value signal value D by the A / D converter 20 and stored. It is sequentially stored in the means 23. Then, in the present embodiment, signals are transmitted from all the radiation detection elements 7 by performing the above-mentioned readout process while sequentially applying an on-voltage from the gate driver 15b of the scanning drive means 15 to each of the lines L1 to Lx of the scanning line 5. The value D is read out.

The control means 22 is composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a computer in which an input / output interface and the like are connected to a bus, an FPGA (Field Programmable Gate Array), and the like (not shown). Has been done. It may be composed of a dedicated control circuit.

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

Further, as described above, the control means 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 means 15, the readout circuit 17, and the like. The signal value D from the radiation detection element 7 of the above is read out, the read signal value D is stored in the storage means 23, or the stored signal value D is stored via the communication unit 30. Controls such as transfer to the outside are performed.

[About the configuration of portable radiographic imaging equipment]
FIG. 2 is a perspective view showing the 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 along the X-ray line of FIG. In addition, in FIG. 3, the thickness in the vertical direction is made thicker than the actual thickness in order to make the internal configuration easy to understand.
As shown in FIG. 3, the radiation imaging apparatus 1 is configured such that a sensor panel SP (also referred to as a TFT panel or the like) is housed in a housing 40. In addition, in FIG. 3, the radiation imaging apparatus 1 is shown in a state where the radiation incident plate 415 to which the radiation is irradiated is arranged so as to be on the lower side in the drawing. Further, in the following, the vertical direction of the radiographic image capturing apparatus 1 will be described based on the case where the radiographic imaging apparatus 1 is arranged in the state of FIG.

In the present embodiment, the housing 40 of the radiation imaging apparatus 1 mainly has 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 thereof. 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. It is formed of a plate 42.

In the present 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 integrated by autoclaving or hot pressing. Is formed in.
Further, the back plate 42 is made of, for example, a metal having high specific strength and heat dissipation, specifically, a magnesium alloy (for example, AZ31 plate material for pressing), and the bottom plate 425 and the side wall portion 426 are integrally formed by pressing. It is formed. Further, an aluminum alloy (for example, A5052) or CFRP may be used for the back plate 42.

Further, the back plate 42 is attached to the support column 44 erected from the side wall portion 416 of the front plate 41, the base 50 or the like described later of the sensor panel SP toward the back plate 42 side by the screw 43 which is a fastening member. ing. The back plate 42 is combined with the front plate 41 to have a rectangular box shape when viewed from above and below.
Further, 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 housing 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 therein 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 arranged on the lower surface side of the base 50. Then, 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.

Further, a scintillator 55 is formed on one surface of the scintillator substrate 54 made of a glass substrate or the like. In the present embodiment, the sensor substrate 51 and the scintillator substrate 54 are arranged so that the scintillator 55 and each radiation detection element 7 face each other, and the sensor substrate 51 is located on the outer portion of each radiation detection element 7, the scintillator 55, or the like. And the scintillator substrate 54 are attached by an adhesive (not shown).

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

The PCB substrate 57 is provided with circuits such as the above-mentioned control means 22 and storage means 23 (see FIG. 1), electronic members, and the like (hereinafter collectively referred to as electronic devices 58). Although FIG. 3 shows a state in which the electronic device 58 is arranged on the lower surface side of the PCB board 57, the electronic device 58 is placed on the upper surface side (or both the lower surface side and the upper surface side) of the PCB board 57. It may be arranged.

In the radiographic imaging apparatus 1 according to the present embodiment, the sensor panel SP is formed as described above. Since the electronic device 58 is arranged 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 from the back plate 42 (that is, without removing the sensor panel SP from the housing 40). The electronic device 58 can be easily replaced.

Further, as shown in FIG. 3, a spacer 60 is arranged between the scintillator substrate 54 and the front plate 41. Further, in the present embodiment, a heat conductive member 61 is arranged between the read-out IC 16 and the back plate 42, and the heat generated by the read-out IC 16 is conducted to the back plate 42 side to the outside of the device from the back plate 42. It is designed to dissipate heat. Further, a heat insulating member 62 is arranged between the read-out IC 16 and the base 50 of the sensor panel SP to prevent heat generated by the read-out IC 16 from being transmitted to the sensor panel SP side.

[Detailed structure of packing]
Next, the structures of the housing 40 and the packing 63 will be described in detail with reference to FIGS. 4 to 9. FIG. 4 is a plan view of the corner portion of the front plate 41 of the housing 40 viewed from above, and FIG. 5 is a cross-sectional view taken along the radiation incident direction (direction perpendicular to the radiation incident plate 415) at the outer edge portion of the housing 40. 5 (A) is a cross-sectional view showing only the cross section along the YY line of FIG. 4, and FIG. 5 (B) is a cross-sectional view showing only the cross section along the ZZ line of FIG. is there.

As described above, the front plate 41 of the housing 40 has side wall portions 416 standing along the outer edges 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. 5A, a head portion 416a having an outer edge portion lowered one step over the entire circumference of the side wall portions 416 on the four sides is formed at the upper end portion of each side wall portion 416. The side wall portion 426 of the back plate 42 is fitted to the head portion 416a.

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

The packing 63 has a rectangular cross-sectional shape cut in 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 highly waterproof, has a low repulsive force, and has a 25% compressive load in the thickness direction of 0.25 [MPa] or less, which will be described later. The definition of 25% compressive load follows the definition of JIS K6245 "Vulcanized rubber and thermoplastic rubber, how to obtain stress-strain characteristics".
As a guideline for the repulsive force of the packing 63, a packing 63 having a durometer hardness of 30 degrees or less may be used in the thickness direction described later, or a packing 63 that satisfies both the compressive load and the durometer hardness is used. You may. Durometer hardness conforms to the provisions of JIS K6253-3 "Vulcanized rubber and thermoplastic rubber, how to determine hardness, Part 3 Durometer hardness".

The method for forming the packing 63 is not limited, but here, a case where the sheet material is punched or formed so as to have a set overall shape will be illustrated.
Further, the packing 63 does not have to be adhered to either the front plate 41 or the back plate 42, but it is desirable that the packing 63 is adhered to either one or both of the front plate 41 and the back plate 42. Here, the case where the packing 63 is adhered only to the upper end surface 416b side of the side wall portion 416 is illustrated.

Here, the range of the corner portion 631 of the packing 63 is defined as follows. The packing 63 is provided with a portion (part 632 other than the corner portion) extending straight along the longitudinal direction of each side wall portion 416 (one of the four sides of the rectangular housing 40) and two adjacent corner portions. It is composed of a corner portion 631 at which the portions 632 of the above intersect.
Then, as shown in FIG. 6A, when the inner edge portion at the corner is formed in an arc shape, one boundary point p1 between the straight portion of the packing 63 and the portion curved in the arc shape. The 90 ° range between the straight line l1 connecting the center of the arc and the reference point c, which is the center of the arc at the inner edge, and the straight line l2 connecting the other boundary point p2 and the reference point c is defined as the corner 631. To do.

As shown in FIG. 6B, when the inner edge portion at the corner of the packing 63 is formed in a shape bent at a right angle instead of an arc shape, the apex bent at a right angle of the inner edge portion is used as a reference point. As c, a straight line l1 along the longitudinal direction of one straight portion 632 that passes through the reference point c and connects to the corner 631, and a straight portion 632 that passes through the reference point c and connects to the corner 631. The range of 90 ° sandwiched by the straight line l2 along the longitudinal direction of is defined as the corner 631.

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

The "thickness after compression" is the thickness in the vertical direction (reference numeral t in FIG. 7) when the packing 63 is compressed and held by the front plate 41 and the back plate 42, and the "width" is the packing 63. It means the entire width in the horizontal direction from the inside to the outside (reference numeral 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 screw described above for both the corner portion 631 and the portion 632 other than the corner portion. It is equal to the height of the seat 413 to which the 43 is mounted.

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 portion" is orthogonal to the vertical direction and the longitudinal direction of the packing 63 at each position of the total length of the portion 632 other than the corner portion. In the direction, it is the value obtained by dividing the narrowest width by the thickness of the packing 63 (height of the seat portion 413).
For example, as shown in FIG. 4, when the insertion portion 633 of the screw 43 described later is formed in the portion 632 other than the corner portion of the packing 63, the packing 63 at a position where it passes through the insertion portion 633. The value obtained by dividing the width of the above 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 portion 632 other than the corner portion of the packing 63".

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

Then, in this way, the value of "the minimum value of the ratio of the width to the post-compressed thickness in the cross section of the corner portion 631 of the packing 63" is set to "the width with respect to the post-compressed thickness in the cross section of the portion 632 other than the corner portion of the packing 63". By setting it larger than the "minimum value of the ratio of", it is possible to suppress the occurrence of breakage, misalignment, peeling, etc. of the packing 63 at the corner portion 631 where a large impact force is likely to be applied when the radiation imaging apparatus 1 is dropped. ..

Further, the value of "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" is set to be 6 times or more. That is, at least the minimum "width in the cross section of the corner portion 631 of the packing 63" is set to be at least 6 times or more the "thickness after compression in the cross section of the corner portion 631 of the packing 63". In addition, in FIGS. 5 and 7, the thickness of the packing 63 is shown to be thicker than the actual thickness.
As described above, since the width is relatively wide compared to the thickness of the packing 63, it is possible to suppress the occurrence of collapse in addition to breakage, misalignment, and peeling.

Further, the packing 63 is formed with a concave insertion portion 633 for inserting a screw 43 for fastening the front plate 41 and the back plate 42 of the housing 40, and the insertion portion 633 is the packing 63. It is formed outside the range of the corner portion 631, that is, a portion 632 other than the corner portion, at a position separated from the corner portion 631 by a predetermined length or more.
More specifically, as shown in FIG. 4, the insertion portion 633 is a 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 narrow the width of the packing 63 to reduce the strength related to breakage, misalignment, peeling, falling, etc., but it is formed apart from the corner portion 631 which has a large impact when dropped. It is possible to reduce the occurrence of breakage, misalignment, peeling, falling, etc. when receiving an impact.

The corner portion 631 of the packing 63 is formed with a recess 634 for a screw shield. The screw 451 has a block 45 formed of a member different from the front plate 41 at the corner portion 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. It is desirable that the fastening member for fastening the front plate 41 and the back plate 42 be 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 need, the recess 634 is not cut as deeply as the insertion portion 633, and the recess 634 is not a target to be arranged more than a predetermined length away from the corner 631. ..

Further, as shown in FIG. 8, the side surface portion (side wall portion 416 of the front plate 41) of the housing 40 is equipped with exterior parts 47 such as an operation panel, an external connector, an antenna, and an indicator (connector in FIG. 8). (Example).
When such an exterior component 47 is equipped, the upper end surface 416b of the side wall portion 416 is largely cut out in the width direction. 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 post-compressed thickness in the cross section of the portion 632 other than the corner of the packing 63 is "the minimum ratio of the width to the post-compressed thickness in the cross section of the corner 631 of the packing 63". A section k smaller than the “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, also for the portion 632 other than the corner portion of the packing 63, the length of the portion 632 other than the corner portion of the section k in the longitudinal direction is set so as not to reduce the strength related to breakage, misalignment, peeling, tilting, etc. It is set to be 150 [mm] or less.
Not limited to the above connector, the ratio of the width to the post-compressed thickness in the cross section of the entire portion 632 other than the corner of the packing 63 is "the width to the post-compressed thickness in the cross section of the corner 631 of the packing 63". The length of continuous sections smaller than the "minimum value of the ratio of" is set to be 150 [mm] or less.

[Technical Effects of Embodiments of the Invention]
As described above, in the radiation imaging apparatus 1, the packing 63 is provided between the front plate 41 and the back plate 42 of the housing 40, and "the ratio of the width to the post-compressed thickness in the cross section of the corner portion 631 of the packing 63". The value of "minimum value of" is set to be larger than "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".
As a result, in the corner portion 631 where a large impact force is likely to be applied when the radiation imaging apparatus 1 is dropped, it is possible to suppress the occurrence of breakage, misalignment, adhesive peeling, fall, etc. of the packing 63, and the sealing property is maintained high. It becomes possible.
Further, since the minimum value of the width ratio to the compressed thickness of the corner portion 631 is larger than that of the portion 632 other than the corner portion, the housing 40 is different from the case where the above ratio is increased for the entire packing 63. It is possible to suppress the reduction of the imaging range of the radiographic image due to the reduction of the internal volume of the housing 40, and it is possible to avoid the reduction of the sealing property due to the housing 40 being bent by the elastic force of the packing 63. Become.

Further, 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 portion 631 of the packing 63" is 6 times or more.
Here, the results of an impact resistance test using three types of packing having different widths and ratios of thickness and width after compression will be described with reference to FIG.

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

As a result of mounting each of the above packings on the housing 40 and performing an impact test by dropping the packings a plurality of times, in the comparative example in the upper part of FIG. 9, any one of breakage, misalignment, peeling, and falling occurred frequently in the packings.
On the other hand, in the examples in the middle and lower stages of FIG. 9, the packing has almost or no breakage, misalignment, peeling, or collapse, and the packing has a “minimum value of the width ratio to the thickness after compression”. It was confirmed that by increasing the value of 6 times or more, sufficient durability due to impact force can be obtained for the packing.
Therefore, even in the case of the packing 63 mounted on the housing 40, the impact force is set by setting 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" to 6 times or more. It is possible to sufficiently improve the durability of the corners that are susceptible to damage.

Further, since the insertion portion 633 through which the screw 43 for fastening the front plate 41 and the back plate 42 passes is provided in the portion 632 other than the corner portion of the sealing material 63, the influence of the width reduction due to the formation of the insertion portion 633 is an angle. It can be prevented from directly reaching the portion 631, and the impact resistance of the packing 63 can be further improved.
In particular, by separating the insertion portion 633 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 to.

Further, the section k in which the ratio of the width to the post-compressed thickness 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 post-compressed thickness 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.
Therefore, it is possible to suppress a decrease in strength against breakage, misalignment, peeling, falling, etc. of the portion 632 other than the corner portion of the packing 63, and suppress a decrease in sealing property of the portion other than the corner portion of the housing 40 against impact. I am trying to.

Further, since the exterior component 47 of the housing 40 is arranged so as to avoid the corner 631 of the packing 63, the influence of the width reduction of the packing 63 for avoiding the exterior component 47 does not directly affect the corner 631. This makes it possible to further improve the impact resistance of the packing 63.

Further, the 25% compressive 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 deterioration of the sealing property due to the gap of the housing 40 or the like.
Further, since the packing 63 is made of a flexible foam material, it is possible to further suppress the repulsive force of the packing 63 and reduce the occurrence of deterioration of the sealing property.

[Other examples of packing strength]
In the packing 63, the relationship between the corner portion 631 and the portion 632 other than the corner portion is defined as the minimum value of the ratio of the width to the thickness after compression in the cross section, and the adverse effect of the strength related to impact resistance and the repulsive force of the packing 63. We are trying to make adjustments with, but it is not limited to this.
For example, by making the minimum value of the width in the cross section of the corner portion 631 of the packing 63 larger than the minimum value of the width in the cross section of the portion 632 other than the corner portion of the sealing material 63, the width with respect to the thickness after compression in the cross section is increased. It is possible to obtain the same technical effect as when specifying the ratio.

In this case, as can be seen from the comparison of FIG. 9 described above, it is desirable that the minimum width of the corner portion 631 of the packing 63 in the cross section is 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]. It is desirable to do the following. Also in this case, it is possible to suppress a decrease in the strength of the portion 632 other than the corner portion of the packing 63 and suppress a decrease in the sealing property of the portion other than the corner portion of the housing 40 against an impact.

[Other examples of housing]
The shape and structure of the housing 40 of the radiation imaging apparatus 1 are not limited to those described above, and the packing 63 can be applied to any type of housing in which the packing 63 is compressed and sandwiched. Another example will be described below. In the following description, the same components as those of the housing 40 are designated by the same reference numerals and the description thereof will be omitted.

For example, the case where the back plate 42 of the housing 40 has the side wall portion 426 has been illustrated, but as shown in FIGS. 10A and 10B, the flat back plate 42A having no side wall portion 426 is illustrated. The packing 63 may be mounted on the housing 40A having the above. In this case, the head portion 416a is not formed on the front plate 41A side.
Further, as shown in FIGS. 11A and 11B, the housing 40A protrudes from the upper end surface 416b of the side wall portion 416 of the front plate 41, and has a protruding portion 418A surrounding the outer edge portion of the back plate 42. It may have a structure.
Further, 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, the packing 63 may be provided on the housing 40B having the back plate 42B whose side wall portion 426B extends to the lower end of the housing 40B. .. In this case, the head portion 416a is not formed on the front plate 41B side.
In this housing 40B, since the side wall portion 426B of the back plate 42B extends downward, a horizontal screw 43 is provided on the outside of the side wall portion 426B, and the front side wall portion 426B of the back plate 42B is penetrated. Since it can be fastened to the screw holes formed in the side wall portion 416B of the plate 41B, it is not necessary to provide the seat portion 413 on the upper end surface 416b of the side wall portion 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 a sealing material is not limited to a solid rectangular shape as in the packing 63 as shown in FIG. 7.
For example, as shown in the packing 63A of FIG. 13A, the corner of one end (upper end in this example) of the rectangle having a cross-sectional shape may be rounded in an arc shape.
Further, as shown in the packing 63B of FIG. 13B, the cross-sectional shape may be triangular. The cross section may be circular, oval, or polygonal as long as it does not adhere to the front plate 41 side.
Further, as shown in the packing 63C of FIG. 13C, the inside may be hollow. In this case, the external cross-sectional shape is not limited to FIG. 13A, and may be triangular, circular, oval, or polygonal.
Further, as shown in the packing 63D of FIG. 13D, the inside may be hollow, and the inside may be open 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 of the packing in the cross section is the widest part in the horizontal direction. Further, in any case, the thickness after compression in the cross section of the packing is the thickness in the state of being compressed and equipped in the housing.

Further, even when the packing has a cross-sectional shape as shown in FIGS. 13 (A) to 13 (D), 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 with the minimum value of the ratio of the width to the thickness after compression in the cross 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% compression load of the packing, the durometer hardness, and the packing material. Is the same as the packing 63 described above.

[Other]
For all four corners 631, the packing 63 has a minimum value of the ratio of the width to the post-compressed thickness in the cross section of the corner of the sealing material and the ratio of the width to the post-compressed thickness in the cross section of the non-corner portion. It is desirable that the above-described settings are applied to the relationship with the minimum value of the packing 63, the relationship between these minimum widths, the arrangement of the insertion portion 633, the arrangement of the exterior parts, and other various settings of the packing 63 mentioned in the embodiment. , The above-mentioned contents may be applied only to a part of the corner portions 631.

Further, the packing 63 exemplifies the case where the thickness is uniform as a whole, but the case is not limited to this, and even when the thickness is non-uniform, the width with respect to the thickness after compression in the cross section of the corner portion of the sealing material. Relationship between the minimum value of the ratio of the above and the minimum value of the ratio of the width to the thickness after compression in the cross section other than the corner, the relationship between these minimum widths, the arrangement of the insertion part 633, the arrangement of the exterior parts, etc. It is desirable that the various settings of the packing 63 mentioned in the embodiment have the above-mentioned setting contents.

Further, the packing is not limited to those for waterproof purposes, and may be made of a material exclusively suitable for dustproof purposes.
Needless to say, the present invention is not limited to each of the above embodiments, and can be appropriately modified as long as the gist of the present invention is not deviated.

1 Radiation imaging device (portable radiation imaging device)
40, 40A, 40B Housing 41, 41A, 41B Front plate (front member)
413 Seat 415 Radiation incident plate 416, 416B Side wall 416a Head 416b Upper end surfaces 42, 42A, 42B Back plate (back member)
425 Bottom plate 426,426B Side wall 43 screws (fastening member)
47 Exterior parts 63, 63A, 63B, 63C, 63D Packing (seal material)
631 Corner part 632 Part other than the corner part 633 Insertion part 634 Recessed part
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 multiple radiation detection elements are arranged two-dimensionally,
A housing in which the sensor panel is housed is provided.
The housing is a portable radiographic imaging apparatus having a front member on the side where radiation is incident and a back member on the side opposite to 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 post-compressed thickness in the cross section of the corner of the sealing material located at the corner of the housing is the width to the post-compressed thickness in the cross section of the portion other than the corner of the sealing material. A portable radiographic imaging device characterized in that it is larger than the minimum value of the ratio.
However, the range of the corner portion of the sealing material is defined by the center of the arc shape when the inner edge portion of the corner portion has an arc shape, and is bent when the inner edge portion of the corner portion has a bent shape. The apex is used as a reference point, and the range is defined as a range sandwiched between two lines that pass through the reference point and are perpendicular to two adjacent sides with the corner portion in between. The portable radiographic imaging apparatus according to claim 1, wherein 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 seal in a section in which the ratio of the width to the post-compressed thickness in the cross section of the portion other than the corner of the sealing material is smaller than the minimum value of the ratio of the width to the post-compressed thickness in the cross section of the corner of the sealing material. The portable radiographic imaging apparatus according to claim 1 or 2, wherein the length continuous in the direction along the material is 150 [mm] or less. A sensor panel in which multiple radiation detection elements are arranged two-dimensionally,
A housing in which the sensor panel is housed is provided.
The housing is a portable radiographic imaging apparatus having a front member on the side where radiation is incident and a back member on the side opposite to the front member.
A sealing material is provided between the front member and the back member.
A portable radiographic imaging apparatus, characterized in that 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.
However, the range of the corner portion of the sealing material is defined by the center of the arc shape when the inner edge portion of the corner portion has an arc shape, and is bent when the inner edge portion of the corner portion has a bent shape. The apex is used as a reference point, and the range is defined as a range sandwiched between two lines that pass through the reference point and are perpendicular to two adjacent sides with the corner portion in between. The portable radiographic imaging apparatus according to claim 4, wherein the minimum value of the width in the cross section of the corner portion of the sealing material is 2 [mm] or more. The length of a section in which the width in the cross section of the portion other than the corner portion of the sealing material is smaller than the minimum value of the width in the cross section of the corner portion of the sealing material is 150 [mm] continuous in the direction along the sealing material. ] The portable radiographic imaging apparatus according to claim 4 or 5, wherein the device is as follows. The invention according to any one of claims 1 to 6, wherein an insertion portion through which a fastening member for fastening the front member and the back member passes is provided at a portion other than the corner portion of the sealing material. Portable radiographic imaging device. The portable radiographic imaging apparatus according to claim 7, wherein the insertion portion of the sealing material is arranged at a distance of 9 [mm] or more from the outer surface of the corner portion of the housing closest to the insertion portion. .. The portable radiographic imaging apparatus according to any one of claims 1 to 8, wherein the exterior parts of the housing are arranged so as to avoid the corners of the sealing material. The possibility according to any one of claims 1 to 9, wherein the 25% compressive load in the direction of being 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 the durometer hardness in the direction compressed by the front member and the back member of the sealing material is 30 degrees or less. Shooting device. The portable radiographic imaging apparatus according to any one of claims 1 to 11, wherein the sealing material is a flexible foam material.

Images