Radiography equipment

Abstract

To protect a radiation detector from an impact.SOLUTION: A radiography device of the present invention comprises: a radiation detector that converts radiation passing through a subject into an electric signal; a support base that supports the radiation detector, and has a first protrusion part provided on an opposite side relative to a support plane supporting the radiation detector; and an outer sheath that incorporates the radiation detector, and has a second protrusion part provided in a bottom surface facing the first protrusion part. The support base has a third protrusion part provided in a lateral face vertical to the support plane, and a distance between an inner side plane facing the third protrusion part out of the outer sheath and the third protrusion part is more than a distance in a direction vertical to a radiation incidence direction between the first protrusion part and the second protrusion part.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a radiographic apparatus. [Background technology]

[0002] Radiation imaging devices that detect radiation transmitted through a subject and convert it into an electrical signal are widely used. Such radiation imaging devices are required to be portable and easy to operate, and efforts are being made to make them smaller, thinner, and lighter. Radiation imaging devices contain radiation detectors, and they are required to be not only easy to operate but also robust enough to protect the radiation detectors from drops and impacts.

[0003] To protect a radiation detector, it is necessary to mitigate, disperse, or prevent the propagation of impacts to the interior. Patent Document 1 discloses a structure in which a buffer material is placed between the inner surface of the housing main body and the sensor panel. Patent Document 2 discloses a structure in which a buffer material is placed on the side of the housing. Patent Document 3 discloses a structure in which an outer wall hole is provided in the corner of a cover member that closes the opening of the housing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-33055 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-133892 [Patent Document 3] International Publication No. 2011 / 036901 Summary of the Invention [Problem to be solved by the invention]

[0005] In a radiographic imaging device in which the internal unit including the radiation detector and the housing are constructed separately, the internal unit and the housing move separately when the radiographic imaging device receives an impact. In this case, even if a cushioning material is placed around the internal unit, the cushioning material may be crushed by the impact, causing the internal unit to collide with the inner surface of the housing, which may damage the radiation detector.

[0006] The present invention has been made to solve the above-mentioned problems, and has an object to protect a radiation detector from impacts. [Means for solving the problem]

[0007] The present invention is characterized in that it comprises a radiation detector that converts radiation that has passed through a subject into an electrical signal, a support base that supports the radiation detector and has a first convex portion provided on a surface opposite to a support surface that supports the radiation detector, and an exterior that contains the radiation detector and has a second convex portion provided on a bottom surface that faces the first convex portion, wherein the support base has a third convex portion provided on a side perpendicular to the support surface, and the distance between the third convex portion and an inner surface of the exterior that faces the third convex portion is equal to or greater than the distance between the first convex portion and the second convex portion in a direction perpendicular to the direction of incidence of radiation. [Effects of the Invention]

[0008] According to the present invention, the radiation detector can be protected from impacts. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 10 is a diagram showing the appearance of a radiation imaging apparatus of a comparative example. [Figure 2] FIG. 10 is a cross-sectional view of a radiographic imaging apparatus according to a comparative example. [Figure 3] FIG. 10 is a rear view of the inside of a radiation imaging apparatus according to a comparative example. [Figure 4] 1 is a cross-sectional view of a radiation imaging apparatus according to a first embodiment. [Figure 5]FIG. 10 is a cross-sectional view of a radiation imaging apparatus according to a second embodiment. [Figure 6] FIG. 10 is a cross-sectional view of a radiation imaging apparatus according to a third embodiment. [Figure 7] FIG. 10 is a diagram showing the arrangement of convex portions in a radiation imaging apparatus according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. The dimensions and structural details shown in each embodiment are not limited to those shown in the embodiments and drawings. The radiation described in the embodiments includes not only X-rays, but also alpha rays, beta rays, gamma rays, particle rays, cosmic rays, and the like.

[0011] FIG. 1 is a diagram showing the appearance of a radiographic imaging device (hereinafter referred to as imaging device) according to a comparative example. FIG. 1(a) is a diagram of the imaging device 100 as seen from the incident surface side, and FIG. 1(b) is a diagram of the imaging device 100 as seen from the rear side. Note that each figure, including FIG. 1, illustrates the X-axis, Y-axis, and Z-axis. The plane including the X-axis and Y-axis is a plane parallel to the incident surface. The Z-axis is an axis parallel to the radiation incident direction (hereinafter referred to as the incident direction).

[0012] The imaging device 100 has an exterior that houses the components of the imaging device 100. The exterior is approximately rectangular and made of a lightweight, high-strength material. Specifically, the exterior is made of CFRP, aluminum alloy, magnesium alloy, or the like. The exterior is made up of a housing 1 and a radiation-transmitting plate 2. The radiation-transmitting plate 2 is made of a material with high radiation transmittance, taking into consideration high sensitivity, low radiation exposure, and the like. Specifically, the radiation-transmitting plate 2 is made of a material with high elasticity and high radiation transmittance, such as CFRP.

[0013] FIG. 2 is a cross-sectional view taken along II in FIG. 1(b) in the Z direction and viewed from the direction of the arrow. The imaging device 100 is supported by a support base 8 with a phosphor 5, a radiation detector 6 (hereinafter referred to as the sensor 6), and a radiation-shielding material 7 stacked inside. The imaging device 100 also has a buffer member 9 inside on the light-receiving surface side of the sensor 6.

[0014] The phosphor 5 receives radiation that has passed through the subject from the incident surface side of the imaging device 100 and converts it into light. GOS (Gd2O2S) or CsI is generally used for the phosphor 5. Note that the phosphor 5 may be crushed or damaged by localized loads or impacts, which may affect the radiographic image. The sensor 6 converts the light converted by the phosphor 5 into an electrical signal. The sensor 6 is generally made of glass. Therefore, the sensor 6 may be damaged if subjected to a strong impact, load, or displacement.

[0015] The radiation shielding material 7 protects the electric circuit board from radiation that has passed through the subject and the sensor 6. The radiation shielding material 7 also prevents radiation that has passed through the imaging device 100 and is scattered by a wall or the like behind it from bouncing back and re-entering the phosphor 5 and the sensor 6. The radiation shielding material 7 is made of a material such as Mo, W, Pb, Al, Cu, SUS, or Ba sulfate, or a sheet material containing a mixture of these materials.

[0016] The buffer member 9 absorbs shocks that are caused by external forces and that are applied to the imaging device 100. Similar to the radiation-transmitting plate 2, the buffer member 9 is made of a material with high radiation transmittance so that the radiation that has passed through the subject reaches the phosphor 5 with as little attenuation as possible.

[0017] The support base 8 has a substantially rectangular shape and supports the sensor 6 via the radiation shielding material 7. On the surface of the support base 8 opposite to the support surface that supports the sensor 6, electric boards 11a, 11b, and 11c and a wireless communication module board 11d are arranged (see also FIG. 3, which will be described later). The electric boards 11a and 11b read out the electric signals converted by the sensor 6 via the flexible boards 10a and 10b. The electric board 11c receives the read-out electric signals via the flexible boards 10c and 10e and generates image data.

[0018] The wireless communication module substrate 11d receives the generated image data via the flexible substrate 10d and communicates with a display system (not shown) through an external communication unit (not shown). The communication method may be either a wired connection or a wireless connection. In the case of a wireless connection, the 2.4 GHz band or the 5 GHz band is mainly used. By communicating in this manner, the image data is transferred to a PC, tablet, or the like that constitutes the display system, allowing the user to check the radiographic image.

[0019] The photographing device 100 also has an antenna 12 for wireless communication inside the housing 1 as a device for transferring image data via wireless communication. If a metallic material is used for the exterior, wireless radio waves are blocked, so the housing 1 is provided with radio wave transparent windows 3 and 4. The radio wave transparent windows 3 and 4 are made of a resin material or the like that does not deteriorate the radio radiation characteristics. The antenna 12 is positioned close to the radio wave transparent window 4 in consideration of the radiation characteristics. The radio wave transparent windows 3 and 4 may be integrated so as to straddle adjacent surfaces of the housing 1.

[0020] FIG. 3 is a diagram of the image capturing device 100 seen from the rear side, with the rear surface of the housing 1 removed. Since the photographing device 100 is a wireless type, it is equipped with a power supply 13 for driving the device. A rechargeable secondary battery is used as the power supply 13. Specifically, a lithium ion battery, a lithium ion capacitor, or the like is used as the power supply 13. However, the type of power supply 13 is not limited as long as it is capable of driving the photographing device 100. Furthermore, the power supply 13 is detachable from the housing 1. It is preferable that the photographing device 100 has a structure that allows direct access to the power supply 13 for attachment and detachment without removing the housing 1.

[0021] The imaging device 100 also has ribs 20 and buffer members 21 for protecting the interior from loads and unexpected impacts that may be applied during use. The ribs 20 are provided on the surface of the support base 8 opposite to the surface that supports the sensor 6. The ribs 20 receive loads and impacts from the radiation transparent plate 2 side. On the other hand, the buffer members 21 are provided on the side of the support base 8 that is perpendicular to the surface that supports the sensor 6. The buffer members 21 reduce the inertial force of the sensor 6 and surrounding components in the X or Y direction when the imaging device 100 is dropped. In this way, the ribs 20 protect against loads in the incident direction, and the buffer members 21 protect against loads in the X or Y direction, with the protection roles being divided between the ribs 20 and the buffer members 21. The imaging device 100 of the comparative example is configured so that when a strong impact such as a fall occurs, the inertial force in the X or Y direction is received only by the buffer members 21.

[0022] [First Example] Next, the imaging device 300 of the first embodiment will be described. 4 is a cross-sectional view of the imaging device 300. Note that the same components as those in the comparative example described above are given the same reference numerals and the description thereof will be omitted. The exterior of the imaging device 300 is configured to include a housing 31 and a radiation-transmitting plate 2. The imaging device 300 also has a support base 38 that supports the sensor 6. Here, the phosphor 5, sensor 6, radiation-shielding material 7, buffer member 9, and support base 38 are collectively illustrated as an internal unit U.

[0023] The support base 38 has a support surface 38a that supports the sensor 6, a back surface 38b opposite to the support surface 38a, and a side surface 38c perpendicular to the support surface 38a. The support base 38 has a first protrusion 39a on the back surface 38b. The first protrusion 39a protrudes from the back surface 38b of the support base 38 toward the bottom surface 31b of the housing 31. The first protrusion 39a is formed integrally with the support base 38. The first protrusion 39a is generally cylindrical, and has a generally circular outer shape when viewed from the incident direction. However, the first protrusion 39a may have another shape, such as a prismatic column.

[0024] The housing 31 has a second protrusion 31a on its bottom surface 31b opposite the first protrusion 39a. The second protrusion 31a protrudes from the bottom surface 31b of the housing 31 toward the back surface 38b of the support base 38. The second protrusion 31a is integral with the housing 31. The second protrusion 31a is formed so as to sandwich the first protrusion 39a from both sides in the X direction. The second protrusion 31a is also formed so as to sandwich the first protrusion 39a from both sides in the Y direction. The second protrusion 31a has a substantially annular or cylindrical shape overall, and has a substantially annular shape with the first protrusion 39a located inside when viewed from the incident direction. Therefore, the second protrusion 31a is formed so as to surround the first protrusion 39a. The second protrusion 31a may have another shape, such as a rectangular tube.

[0025] With this configuration, when the internal unit U moves in the X direction or the Y direction, the first protrusion 39a comes into contact with the second protrusion 31a, thereby restricting the movement of the internal unit U. Here, the movement of the internal unit U can be limited to only the distance between the first protrusion 39a and the second protrusion 31a.

[0026] Furthermore, a third protrusion 39b is provided on a side surface 38c of the support base 38. The third protrusion 39b protrudes from the side surface 38c of the support base 38 toward an inner surface 31c of the housing 31 that faces the third protrusion 39b. The third protrusion 39b protrudes beyond the end face of the sensor 6. The third protrusion 39b is formed integrally with the support base 38.

[0027] Here, the distance between the first convex portion 39a and the second convex portion 31a in the direction perpendicular to the incident direction is defined as A. On the other hand, if the distance between the inner surface 31c of the housing 31 and the third convex portion 39b is defined as B, then the relationship is "A≦B." In other words, the distance between the inner surface 31c of the housing 31 and the third convex portion 39b is equal to or greater than the distance between the first convex portion 39a and the second convex portion 31a in the direction perpendicular to the incident direction.

[0028] When the imaging device 400 is dropped and an impact occurs, the sensor 6 is likely to be damaged when it is dropped from the side or corner of the housing 31 of the imaging device 400. Unless the internal unit U is rigidly fixed to the housing 31, the housing 31 and the internal unit U will move separately after coming into contact with the floor due to the fall, making it more likely that the side of the sensor 6 will come into contact with the housing 31. In this embodiment, by achieving the relationship "A≦B" as described above, the amount of movement of the internal unit U when it moves within the housing 31 can be minimized. Therefore, it is possible to prevent the side of the sensor 6 from coming into contact with the housing 31 or receiving an impact, and damage to the sensor 6 can be prevented.

[0029] When the impact force on the photographing device 400 reaches a distance A and the strength (deformation) of the first protrusion 39a and the second protrusion 31a exceeds the allowable value, the third protrusion 39b contacts the inner surface 31c of the approaching housing 31 before the sensor 6 does, thereby protecting the sensor 6. As in the present embodiment, the impact is not propagated directly from the housing 31 to the side surface of the internal unit U, but is propagated through a path from the rear side of the sensor 6, thereby eliminating the need to provide an unnecessary distance between the sensor 6 and the inner surface 31c of the housing 31. Therefore, the impact resistance can be improved without increasing the size of the imaging device 400.

[0030] Furthermore, the shapes of the first protrusion 39a, the second protrusion 31a, and the third protrusion 39b in this embodiment are not limited and may be any shape. Note that while Fig. 4 is a cross-sectional view taken in the X direction, a cross-sectional view taken in the Y direction has the same structure. Therefore, the sensor 6 can be protected from impacts in the Y direction as well.

[0031] [Second Example] Next, a description will be given of the imaging devices 400 and 500 of the second embodiment. Note that the same components as those in the comparative example and the first embodiment described above will be given the same reference numerals and the description thereof will be omitted.

[0032] FIG. 5( a ) is a cross-sectional view of the imaging device 400 . The housing 31 of the imaging device 400 is similar to that of the first embodiment and is provided with a second protrusion 31a. The imaging device 400 also has a support base 48 that supports the sensor 6. The support base 48 has a different configuration from the support base 38 of the first embodiment.

[0033] The support base 48 has a support surface 48a that supports the sensor 6, a back surface 48b opposite the support surface 48a, and a side surface 48c perpendicular to the support surface 48a. The support base 48 has a first protrusion 40 on the back surface 48b. The first protrusion 40 is configured as a separate body from the support base 48. The first protrusion 40 is joined to the back surface 48b by adhesion, bonding, fastening, or the like while in contact with the back surface 48b. The first protrusion 40 is generally cylindrical in shape, and has a generally circular outer shape when viewed from the direction of incidence. However, the first protrusion 40 may have another shape, such as a prismatic column.

[0034] Furthermore, a third protrusion 41 is provided on a side surface 48c of the support base 48. The third protrusion 41 is configured as a separate body from the support base 48. The third protrusion 41 is joined to the side surface 48c by adhesion, bonding, fastening, or the like while in contact with the side surface 48c. If the distance between the first convex portion 40 and the second convex portion 31a in the direction perpendicular to the incident direction is A, and the distance between the inner surface 31c of the housing 31 and the third convex portion 41 is B, then the relationship is "A≦B", as in the first embodiment.

[0035] FIG. 5B is a cross-sectional view of the imaging device 500. The housing 31 of the imaging device 500 is similar to that of the first embodiment and is provided with a second protrusion 31a. The imaging device 500 also has a support base 58 that supports the sensor 6. The support base 58 has a different configuration from the support base 38 of the first embodiment.

[0036] The support base 58 has a support surface 58a that supports the sensor 6, a back surface 58b opposite the support surface 58a, and a side surface 58c perpendicular to the support surface 58a. The support base 58 has a first protrusion 50 on the back surface 58b. The first protrusion 50 is configured separately from the support base 48. The first protrusion 50 has a recess 50a that fits into a protrusion 59a of the support base 58. Here, the protrusion 59a and the recess 50a overlap over a length L along the incident direction. This length L is referred to as the fitting length. Meanwhile, there is a gap between the bottom surface 31b of the housing 31 and the first protrusion 50. The length of this gap is referred to as the gap length C. In this embodiment, the fitting length L is set to be equal to or greater than the gap length C, thereby preventing the recess 50a of the first protrusion 50 from slipping out of the protrusion 59a of the support base 58. The first protrusion 50 has a generally cylindrical shape overall, and has a generally circular outer shape when viewed from the incident direction. However, the first protrusion 50 may have other shapes, such as a prismatic column.

[0037] The first protrusion 50 may simply fit the recess 50a into the protrusion 59a, or may be joined by adhesion, bonding, fastening, etc. In addition to fitting, the relationship between the recess and the protrusion may be reversed, with a recess provided on the support base 58 and a protrusion provided on the first protrusion 50 that fits into the recess.

[0038] Furthermore, the support base 58 has a third protrusion 51 on its side surface 58c. The third protrusion 51 is formed separately from the support base 58. The third protrusion 51 is joined to the support base 58 while abutting against the side surface 58c and the back surface 58b of the support base 58. By abutting the third protrusion 51 across the side surface 58c and the back surface 58b, it can be joined to the back surface 58b, which is a wide surface, using a fastening member such as a screw 52. Therefore, peeling due to a decrease in adhesive strength and bonding force when the third protrusion 51 is joined to the support base 58 can be prevented. If the distance between the first convex portion 50 and the second convex portion 31a in the direction perpendicular to the incident direction is A, and the distance between the inner surface 31c of the housing 31 and the third convex portion 51 is B, then the relationship is "A≦B", as in the first embodiment.

[0039] In this way, by making the first protrusions 40, 50 and the third protrusions 41, 51 separate from the support bases 48, 58, the degree of freedom in the shapes of the first protrusions 40, 50 and the third protrusions 41, 51 is improved, and the manufacturing costs of the support bases 48, 58 can be reduced.

[0040] The material of the first protrusions 40, 50 and the third protrusions 41, 51 is not limited to being the same as that of the housing 31 and the support bases 48, 58. Specifically, the material of the first protrusions 40, 50 and the third protrusions 41, 51 is preferably a material that is resistant to damage due to impact, such as metal, resin, or elastomer. For example, when the first protrusions 40, 50 and the third protrusions 41, 51 are made of resin, the material is preferably strong against impact, such as PC, ABS, PC-ABS, or PA. Furthermore, the material of the first protrusions 40, 50 and the third protrusions 41, 51 may be a material that is weaker in strength than the material of the support bases 48, 58. By using such materials, the first convex portions 40, 50 and the third convex portions 41, 51 are damaged before the support bases 48, 58 are damaged by an impact, thereby preventing damage to the sensor 6 supporting the support bases 48, 58.

[0041] In addition, the first protrusions 40, 50 and the third protrusions 41, 51 of this embodiment may be joined to the support bases 48, 58 by a combination of adhesive bonding, joining, fastening, and fitting, or by other joining methods. Furthermore, the first protrusions 40, 50 and the third protrusions 41, 51 may be joined to the support bases 48, 58 by the same joining method or by different joining methods.

[0042] Furthermore, the shapes of the first protrusions 40, 50 and the third protrusions 41, 51 in this embodiment are not limited and may be any shape. Note that while Fig. 5 is a cross-sectional view taken in the X direction, a cross-sectional view taken in the Y direction has the same structure. Therefore, the sensor 6 can be protected from impacts in the Y direction as well.

[0043] [Third Example] Next, an imaging device 600 according to a third embodiment will be described. FIG. 6 is a cross-sectional view of the imaging device 600. The support base 68 has a support surface 68a that supports the sensor 6, a back surface 68b opposite to the support surface 68a, and a side surface perpendicular to the support surface 68a. The support base 68 has a first protrusion 69 on the back surface 68b. The first protrusion 69 protrudes from the back surface 68b of the support base 68 toward the bottom surface 61b of the housing 61. The first protrusion 69 is formed integrally with the support base 68.

[0044] The first protrusion 69 is configured to include two types of protrusions 70a and 70b. The protrusion 70a is generally annular or cylindrical in shape, and has a generally annular shape when viewed from the direction of incidence. The protrusion 70a is a portion that receives an impact from the imaging device 600. The protrusion 70b is generally cylindrical in shape, and has a generally circular outer shape when viewed from the direction of incidence. The protrusion 70b is a portion that prevents the intermediate member 80 from coming loose when the imaging device 600 receives an impact. The length from the back surface 68b of the support base 68 to the tip of the protrusion 70b is longer than the length from the back surface 68b of the support base 68 to the tip of the protrusion 70a.

[0045] The housing 61 has a second protrusion 61a on its bottom surface 61b facing the first protrusion 69. The second protrusion 61a protrudes from the bottom surface 61b of the housing 61 toward the back surface 68b of the support base 68. The second protrusion 61a is formed integrally with the housing 61. The second protrusion 61a has a substantially annular or cylindrical shape overall, and has a substantially annular shape when viewed from the incident direction.

[0046] An intermediate member 80 is provided between the first protrusion 69 and the second protrusion 61a. The intermediate member 80 is configured to include two types of protrusions 81a, 81b that protrude in a direction toward the support base 68. The protrusion 81a is substantially annular, and is substantially cylindrical when viewed from the incident direction. The protrusion 81a has a shape such that the protrusion 70a of the first protrusion 69 can fit inside the protrusion 81a, and the second protrusion 61a can fit outside the protrusion 81a. On the other hand, the protrusion 81b has a substantially annular shape as a whole, and is substantially cylindrical with a smaller diameter than the protrusion 81a when viewed from the incident direction. The protrusion 81b has a shape such that the protrusion 70b of the first protrusion 69 can fit inside the protrusion 81b.

[0047] The intermediate member 80 is preferably made of a material that is resistant to damage due to an impact, and for example, metal, resin, etc. If the intermediate member 80 is made of resin, for example, PC, etc. is used, and if the intermediate member 80 is made of metal, magnesium alloy, aluminum alloy, etc. is used. Furthermore, if the housing 61 and the support base 68 are made of a conductive material, an insulating material may be used for the intermediate member 80 so that they are electrically insulated from each other, or an insulating material may be used for the surface layer, etc. that comes into contact with the first protrusion 69 or the second protrusion 61a. Furthermore, the intermediate member 80 is not coupled to the first protrusion 69 and the second protrusion 61a and is movable along the incident direction. The intermediate member 80 is movable along the incident direction with a certain degree of friction relative to the first protrusion 69 and the second protrusion 61a.

[0048] The first protrusion 69 and the intermediate member 80 are fitted together with gaps formed in the X and Y directions perpendicular to the incident direction. Specifically, a gap of distance X' is formed between the protrusion 70a and the protrusion 81a, and a gap of distance Y' is formed between the protrusion 70b and the protrusion 81b. The gap (X') between the protrusion 70a and the protrusion 81a and the gap (Y') between the protrusion 70b and the protrusion 81b correspond to the dimensional difference between the outer diameters of the protrusions 70a and 70b and the inner diameters of the protrusions 81a and 81b. Thus, the gaps (X') and (Y') are formed at different positions between the first protrusion 69 and the intermediate member 80. Furthermore, when the first protrusion 69 and the intermediate member 80 are fitted together, as shown in FIG. 6, the fitting length L1 between the protrusion 70b and the protrusion 81b is longer than the fitting length L2 between the protrusion 70a and the protrusion 81a.

[0049] Furthermore, the second protrusion 61a and the intermediate member 80 are fitted together with gaps formed in the X and Y directions perpendicular to the incident direction. Specifically, a gap of distance Z' is formed between the protrusions 61a and 81a. The gap (Z') between the protrusions 61a and 81a corresponds to the difference in size between the outer diameter of the protrusion 81a and the inner diameter of the protrusion 61a.

[0050] Here, the distance X' between the convex portion 70a and the convex portion 81a is less than or equal to the distance Y' between the convex portion 70b and the convex portion 81b (X'≦Y'). Therefore, when the imaging device 600 is dropped and an impact occurs, the convex portion 81a of the intermediate member 80 comes into contact with the convex portion 70a of the first convex portion 69 and receives the impact before the convex portion 81b comes into contact with the convex portion 70b of the first convex portion 69. Because the convex portion 70a has a larger outer shape than the convex portion 70b, stress concentration due to the impact is alleviated, and damage to the first convex portion 69 can be suppressed. Furthermore, since the engagement length L1 between the protrusions 70b and 81b is longer than the engagement length L2 between the protrusions 70a and 81a, the protrusions 70b of the first protrusion 69 can be prevented from coming out of the state in which they are engaged with the protrusions 81b of the intermediate member 80.

[0051] Furthermore, the support base 68 of this embodiment has a third protrusion on its side surface, similar to the above-described embodiments. The third protrusion may be formed integrally with the support base 68 or separately. The third protrusion protrudes from the side surface of the support base 68 toward the inner surface of the housing 61 that faces the third protrusion. The distance between the inner surface of the housing 61 and the third protrusion is designated as B. Here, the relationship between distance B, distance X' between protrusion 70a and protrusion 81a, distance Y' between protrusion 70b and protrusion 81b, and distance Z' between protrusion 61a and protrusion 81a is "X' + Z' ≦ B" or "Y' + Z' ≦ B." That is, distance B between the third protrusion and the inner surface of the exterior facing the third protrusion is equal to or greater than the sum of distance X' between protrusion 70a and protrusion 81a and distance Z' between protrusion 61a and protrusion 81a. Furthermore, distance B between the third protrusion and the inner surface of the exterior facing the third protrusion is equal to or greater than the sum of distance Y' between protrusion 70b and protrusion 81b and distance Z' between protrusion 61a and protrusion 81a. In this way, by making the relationship "X'+Z'≦B" or "Y'+Z'≦B", it is possible to prevent the side of the sensor 6 from coming into contact with the housing 61 or being subjected to impact, thereby preventing damage to the sensor 6.

[0052] In this embodiment, the intermediate member 80 is described as being movable along the incident direction relative to the second protrusion 61a. However, the intermediate member 80 may be configured integrally with the housing 61 or may be coupled to the housing 61. In this case, the intermediate member 80 functions as the second protrusion. Therefore, the second protrusion is configured to include two types of protrusions 81a and 81b, and the first protrusion 69 and the second protrusion are fitted together with gaps formed in the X and Y directions perpendicular to the incident direction. Specifically, a gap of distance X' is formed between the protrusion 70a and the protrusion 81a, and a gap of distance Y' is formed between the protrusion 70b and the protrusion 81b. Here, if the distance between the inner surface of the housing 61 and the third protrusion is B, then the relationship between distance B and the distance X' between protrusion 70a and protrusion 81a is "X'≦B." Furthermore, the relationship between distance B and the distance Y' between protrusion 70b and protrusion 81b is "Y'≦B." That is, the distance between the third protrusion and the inner surface of the exterior facing the third protrusion is equal to or greater than the distances of the two gaps formed at different positions between the first protrusion 69 and the second protrusion. By satisfying the relationships "X'≦B" and "Y'≦B," it is possible to prevent the side of the sensor 6 from coming into contact with the housing 61 or being subjected to impact, thereby preventing damage to the sensor 6.

[0053] [Fourth Example] Next, an image capturing device 400 according to a fourth embodiment will be described. FIG. 7 is a diagram showing the internal unit U of the image capturing device 400 of the second embodiment as viewed from the rear side. The first protrusions 40 are arranged adjacent to the four corners of the support base 48. Specifically, two adjacent first protrusions 40 are arranged on the same straight line along one side of the outer shape of the support base 48. The second protrusions 31a are arranged adjacent to the four corners of the bottom surface 31b of the housing 31 in correspondence with the first protrusions 40. 7, when the internal unit U moves inside the housing 31 due to an impact such as that caused by dropping the imaging device 400, it becomes easier to suppress movement in the rotational direction around the Z axis. Furthermore, even if it is difficult to arrange the first protrusions 40 at the four corners of the support base 48, it becomes easier to suppress rotation around the Z axis by arranging at least two first protrusions 40 on the same straight line along (parallel to) one side of the outer shape of the support base 48. In this case, it is preferable to separate the two first protrusions 40 as far as possible.

[0054] Note that the internal unit U may come into contact with the housing 31 not only around the Z axis but also around a rotation axis perpendicular to the Z axis. Contact of the internal unit U with the bottom surface 31b of the housing 31 can be avoided by bringing the first convex portion 40 into contact with the bottom surface 31b, but it is difficult to suppress rotation around the X axis or the Y axis using only the first convex portion 40. In this case, as shown in FIG. 5( a), by arranging the third convex portion 41 at a position closer to the incident surface side than the first convex portion 40, the third convex portion 41 comes into contact with the inner surface 31c of the housing 31, thereby further suppressing rotation of the internal unit U around the Y axis. Note that the third convex portion 41 may have any shape as long as the contact point with the inner surface 31c of the housing 31 is located closer to the radiation transparent plate 2 than the contact point between the first convex portion 40 and the second convex portion 31a.

[0055] Although the present invention has been described above in conjunction with the above-mentioned embodiments, the present invention is not limited to the above-mentioned embodiments, and modifications and the like are possible within the scope of the present invention, and part of the configuration of each embodiment may be combined with the configuration of another embodiment. [Explanation of symbols]

[0056] 300, 400, 500, 600: Radiation imaging device 6: Radiation detector 38, 48, 58, 68: Support base 31a, 61a: Second convex portion 31b: Bottom surface 39a, 40, 50, 69: First convex portion 39b, 41, 51: Third convex portion

Claims

1. a radiation detector that converts radiation that has passed through the subject into an electrical signal; a support base that supports the radiation detector and has a first protrusion provided on a surface opposite to a support surface that supports the radiation detector; an exterior that houses the radiation detector and has a second protrusion provided on a bottom surface that faces the first protrusion, the support base has a third protrusion provided on a side surface perpendicular to the support surface, A radiographic imaging device characterized in that the distance between the inner surface of the exterior facing the third convex portion and the third convex portion is greater than or equal to the distance between the first convex portion and the second convex portion in a direction perpendicular to the radiation incidence direction.

2. 2. The radiographic imaging device according to claim 1, wherein a first gap and a second gap are formed at different positions between the first convex portion and the second convex portion in a direction perpendicular to the radiation incidence direction.

3. a radiation detector that converts radiation that has passed through the subject into an electrical signal; a support base that supports the radiation detector and has a first protrusion provided on a surface opposite to a support surface that supports the radiation detector; an exterior that houses the radiation detector and has a second protrusion provided on a bottom surface that faces the first protrusion, a first gap and a second gap are formed at different positions between the first convex portion and the second convex portion in a direction perpendicular to a radiation incident direction, The radiation imaging apparatus according to claim 1, wherein the support base has a third protrusion provided on a side surface perpendicular to the support surface.

4. the first protrusion has a substantially circular outer shape when viewed from the radiation incident direction, the second protrusion has an annular shape with the first protrusion located therein when viewed from the radiation incident direction, 4. The radiographic imaging device according to claim 2, wherein the first gap and the second gap correspond to the dimensional difference between the outer diameter of the first convex portion and the inner diameter of the second convex portion when the first convex portion and the second convex portion are engaged with each other.

5. 5. The radiographic imaging device according to claim 2, wherein the distance between the inner surface of the exterior facing the third convex portion and the third convex portion is equal to or greater than the distance of the first gap or the distance of the second gap.

6. an intermediate member is provided between the first protrusion and the second protrusion; a third gap is formed between the second protrusion and the intermediate member at a position different from the first gap and the second gap in a direction perpendicular to the radiation incident direction, A radiographic imaging device as described in any one of claims 2 to 5, characterized in that the distance between the inner surface of the exterior facing the third convex portion and the third convex portion is greater than or equal to the sum of the distance of the first gap and the distance of the third gap, or greater than or equal to the sum of the distance of the second gap and the distance of the third gap.

7. 7. The radiographic imaging apparatus according to claim 1, wherein at least one of the first convex portion and the third convex portion is separate from the support base.

8. 8. The radiographic imaging apparatus according to claim 7, wherein the third protrusion is coupled to the support base in a state of abutting against the side surface, or in a state of abutting against both the side surface and the opposite surface.

9. 9. The radiographic imaging apparatus according to claim 1, wherein at least one of the first convex portion and the third convex portion is made of a material having a strength lower than that of a material of the support base.

10. 10. The radiographic imaging apparatus according to claim 1, wherein at least one of the first convex portion and the third convex portion is made of a resin or elastomer material.

11. The first protrusion is provided in a plurality, 11. The radiographic imaging apparatus according to claim 1, wherein at least two of the plurality of first convex portions are arranged on the same straight line along one side of the outer shape of the support base.

12. The exterior and the support base are substantially rectangular, the first protrusions are disposed adjacent to four corners of the support base, 12. The radiographic imaging apparatus according to claim 1, wherein the second protrusions are arranged in the vicinity of four corners of the exterior.

13. 13. The radiographic imaging apparatus according to claim 1, wherein the third convex portion is disposed closer to the incident surface side than the first convex portion in the radiation incident direction.

Images