JP6721415B2 - Radiation measuring device - Google Patents

Description

The present invention relates to a radiation measuring device, and more particularly to a waterproofing technique for a radiation measuring device.

As a radiation measuring device, a portable survey meter or the like is known. A portable radiation measurement apparatus generally includes a probe that detects radiation and a main body unit that has a display unit that displays a measurement value of radiation. Since the radiation measuring apparatus may be used in an environment with a lot of water and dust, the case of the main body unit is required to be waterproof. The case is usually configured by combining a plurality of case pieces (for example, a case body and a lid). In order to ensure waterproofness, a seal member (packing) made of an elastic material such as rubber is usually arranged between the case pieces (for example, between the case body and the lid) (for example, patents). Reference 1).

JP 2012-145405 A JP, 2011-239099, A JP, 2014-194907, A

By the way, in the case, in the battery cover etc. that is opened/closed by the user, it is possible to stably ensure the waterproof property due to the mounting error of the battery cover etc., the twisting or the deviation of the seal member generated at the time of mounting. It was difficult. A technique has been proposed in which the hardness of the sealing member is changed for each sealing surface in order to ensure waterproofness (for example, Patent Document 2). However, in this case, it is necessary to prepare two or more seal members made of different materials, which causes problems such as an increase in the number of parts and an increase in labor for assembling work. Although the number of parts can be reduced by making the hardness different for each part in one seal member, the manufacturing process of such a seal member is complicated and the manufacturing cost is increased. Further, a technique for devising the shape of the seal member has been proposed (for example, Patent Document 3). However, in such a technique, since the shape of the seal member becomes extremely complicated, there are problems such as deterioration of assemblability and deterioration of workability.

An object of the present invention is to ensure waterproofness in a radiation measuring device with a simple configuration.

A radiation measuring apparatus according to the present invention, in a radiation measuring apparatus for measuring radiation, has a battery housing chamber in which a battery is housed, a case main body having an opening communicating with the battery housing chamber, and an outer circumferential groove. Provided on the peripheral groove and the seal member, and a lid mounted on the opening, a seal member fitted into the peripheral groove and serving as an annular elastic body for sealing between the case body and the lid. A seal coupling part, wherein the opening has an inclined opening edge with which the seal member abuts, and the seal coupling part is configured to open the opening edge when the lid is attached to the opening. The rotation of the seal member in the circumferential groove due to the contact of the seal member with the groove is suppressed, and the movement of the seal member in the groove direction in the circumferential groove is suppressed.

According to the above configuration, the seal member seals the space between the case body and the lid, thereby ensuring the waterproofness of the radiation measuring apparatus. Further, the seal coupling portion suppresses rotation (for example, twist) and movement (for example, shift) of the seal member within the circumferential groove. Thereby, the adhesion of the seal member to the circumferential groove is improved, and the waterproofness of the radiation measuring device is further improved.

Desirably, the seal coupling part is a plurality of concave-convex structures provided in the seal member and the circumferential groove.

Desirably, the concavo-convex structure is one of a concave portion and a convex portion provided at an end portion on the case body side of the seal member, and a concave portion and a convex portion provided on a wall portion on the main body side of the circumferential groove. And the other of the parts.

Desirably, the long side of the seal member is provided with a convex portion in the concave-convex structure, the long side of the circumferential groove is provided with a concave portion in the concave-convex structure, the short side of the seal member, A concave portion is provided in the concave-convex structure, a convex portion in the concave-convex structure is provided on a short side of the circumferential groove, and a convex portion on a long side is formed when the lid is attached to the opening. The concave portion is engaged, and the convex portion and the concave portion on the short side are engaged.

Desirably, the circumferential groove has a rectangular shape with four sides bulging outward, and when the seal member is fitted in the circumferential groove, an inward elastic force acts on the entire circumferential groove. .. This improves the adhesion of the seal member to the circumferential groove.

Desirably, the seal member connects a main leg, a sub-leg located closer to the main body than the main leg, an end of the main leg, and an end of the sub-leg. And an outward annular groove is formed between the main leg portion and the sub leg portion. According to this structure, a double seal structure using the main leg portion and the main leg portion is obtained, and the waterproofness of the radiation measuring apparatus is further improved.

Desirably, the bottom surface of the annular groove is an inclined surface.

Desirably, an annular groove for bending the main leg is formed on the lid-side surface of the main leg. As a result, the main leg portion is easily bent, so that the seal structure using the main leg portion is improved in adhesiveness and the radiation measuring apparatus is improved in waterproofness.

According to the present invention, in a radiation measuring apparatus, it is possible to ensure waterproofness with a simple configuration.

It is a perspective view of the main body unit concerning the embodiment of the present invention. It is a top view when the main body unit is seen from the front side. FIG. 6 is a perspective view of the main body unit when viewed from the back side. FIG. 6 is a perspective view of the main body unit when viewed from the back side. FIG. 6 is a perspective view of the main body unit when viewed from the back side. It is an exploded perspective view of a battery cover and a seal member. It is CC sectional drawing of FIG. FIG. 7 is a sectional view taken along line DD of FIG. 6. FIG. 7 is a sectional view taken along line EE of FIG. 6. FIG. 7 is a sectional view taken along line FF of FIG. 6. FIG. 7 is a sectional view taken along line GG of FIG. 6. FIG. 3 is a sectional view taken along line AA of FIG. 2. FIG. 13 is a partially enlarged view of FIG. 12. FIG. 13 is a partially enlarged view of FIG. 12. It is a BB sectional view of FIG. FIG. 16 is a partially enlarged view of FIG. 15. FIG. 16 is a partially enlarged view of FIG. 15. It is a partial cross section figure of FIG.

A radiation measuring apparatus according to an embodiment of the present invention will be described below with reference to the drawings. The radiation measuring apparatus according to this embodiment is a portable radiation measuring apparatus, and is, for example, a survey meter. The radiation measuring apparatus is an apparatus including a plurality of units, and includes, for example, a main body unit and a detection unit that is detachable from the main body unit. It can be said that these are basic units. The radiation measurement apparatus may include an optional unit as an expansion unit or may be connected to a personal computer (PC) as another unit.

1 and 2 show an example of the main body unit according to the present embodiment. FIG. 1 is a perspective view of the main body unit 10, and FIG. 2 is a plan view of the main body unit 10 when viewed from the front side. The detection unit is not shown.

The main body unit 10 and the detection unit are connected by a cable (not shown), and information such as control data and detection data is transmitted and received by a wired communication method. Of course, the main body unit 10 and the detection unit may be connected by a wireless communication system instead of the wired communication system.

The main body unit 10 is a substantially flat plate-shaped unit and has a box-shaped case 12. The case 12 has a substantially rectangular shape in which the length in the front-rear direction (the length in the Y-axis direction in the drawing) is longer than the length in the width direction (the length in the X-axis direction in the drawing) in plan view. .. The thickness of the case 12 (the length in the Z-axis direction in the drawing) is sufficiently smaller than the length in the front-rear direction and the length in the width direction, and the case 12 as a whole has a thin flat plate shape.

A touch panel monitor 14, a power button 16, an operation button 18, and a connecting portion 20 are provided on the surface of the case 12.

The touch panel monitor 14 includes a liquid crystal display and a touch panel (touch sensor), and functions as a user interface that also serves as an input unit and a display unit. On the touch panel monitor 14, measured values of radiation and the like are displayed. In addition, a group of icons for instructing various processes is displayed on the touch panel monitor 14, and the measurer may make various inputs by using the group of icons.

The power button 16 is a button for turning on the power of the radiation measuring apparatus. The operation button 18 is a button for switching measurement modes, setting values, and display modes, for example.

The connection portion 20 is a cable jack into which a connector of a cable (not shown) pulled out from a detection unit (not shown) is inserted. By inserting the connector of the cable pulled out from the detection unit into the connection portion 20 (cable jack) of the main body unit 10, the main body unit 10 and the detection unit are connected, and the connector is removed from the connection portion 20 (cable jack). , The connection is released. As an example, a plurality of types of detection units are prepared for one main body unit 10, and the detection unit connected to the main body unit 10 can be replaced according to the measurement conditions, measurement environment, and the like. ..

A handle 22 stands on the upper surface of the case 12. One end of the handle 22 is attached near the rear end of the main body unit 10, and the other end of the handle 22 is attached at a position adjacent to the touch panel monitor 14. The handle 22 has a bridge shape as a whole. The handle 22 is installed in the center of the main body unit 10 in the width direction (X axis direction) and extends in the front-rear direction (Y axis direction). When measuring radiation, the measurer holds the handle 22 with one hand and the detection unit with the other hand, and directs the detection surface of the detection unit toward the measurement target.

A slide rail 24 is attached to the upper surface of the handle 22. The slider fixed to the detection unit is slidable along the slide rail 24. The detection unit is attached to the main body unit 10 by moving the detection unit rearward with respect to the main body unit 10 and inserting the slider into the slide rail 24.

Recesses 26 are formed on both side surfaces of the case 12 in the front-rear direction (Y-axis direction). The recess 26 has a structure on which the finger of the measurer can be hooked. As will be described later, the case 12 has a battery cover as a lid. When removing the battery cover, a measurer can hook the finger into the recess 26 to remove the battery cover.

Inside the main unit 10, a communication unit that receives the measurement value data sent from the detection unit, a control unit that controls the operation of the main unit 10, a memory that stores the measurement value data, and power supply It has a built-in battery and so on. The measured value is displayed on the touch panel monitor 14 in a predetermined display format under the control of the control unit. The main body unit 10 has, for example, a CPU, and the function of the control unit is realized by, for example, the CPU executing a program.

The detection unit is a unit that detects radiation. A scintillation detector or a radiation detector such as a GM tube is built in the detection unit. When a scintillation detector is adopted, a scintillator for detecting radiation and a photomultiplier tube are built in the detection unit. Further, in the detection unit, an amplifier, a waveform shaping circuit, a wave height discrimination circuit, a counter that counts the number of times of radiation detection, a calculation unit that calculates the radiation count rate and dose rate, and a measurement value that is the calculation result. A communication unit for sending data to the main unit 10 is built in. Of course, these may be built in the main body unit 10 instead of the detection unit. The detection unit has, for example, a CPU and a memory, and the functions of the counter and the arithmetic unit are realized by the CPU executing a program, for example.

FIG. 3 shows the main body unit 10 when viewed from the back side. FIG. 3 is a perspective view of the main body unit 10 as viewed from the back side. The case 12 includes a case body 28 and a battery cover 30 that is detachable from the case body 28. The case main body 28 is composed of an upper case piece 32 and a lower case piece 34 each having a shape obtained by dividing a substantially box-shaped body into two pieces in the thickness direction. A communication unit, a control unit, a memory, various electric wirings, and the like which form the main body unit 10 are housed in an internal space formed by combining the upper case piece 32 and the lower case piece 34. The battery cover 30 is attachable to and detachable from the lower case piece 34. A lock member 36 is provided on the bottom surface of the lower case piece 34. The lock member 36 is a member that allows or regulates the detachment of the battery cover 30 from the case body 28. In addition, recesses 26 for hooking fingers are formed on both side surfaces of the lower case piece 34 along the front-rear direction (Y-axis direction).

FIG. 4 shows the main body unit 10 with the battery cover 30 partially removed. FIG. 4 is a perspective view of the main unit 10 as viewed from the back side. The lower case piece 34 has an opening 38, and the battery cover 30 is attached to the opening 38. The lower case piece 34 has a battery storage chamber 40 in which a battery is stored. That is, the space formed between the battery cover 30 and the lower case piece 34 is used as the battery storage chamber 40, and the dry battery is stored in the battery storage chamber 40. The opening 38 communicates with the battery storage chamber 40, and the battery cover 30 is attached to the opening 38 so that the battery storage chamber 40 is covered with the battery cover 30. The dry battery is a power supply source for driving the main unit 10, and is appropriately replaced by the user. A lock hole 42 for inserting/removing the lock member 36 is provided at an end portion of the inner surface of the battery cover 30, that is, an end portion of the surface of the battery cover 30 on the case body 28 side. When the lock member 36 is inserted into and removed from the lock hole 42, the detachment of the battery cover 30 from the case body 28 is allowed or regulated. When removing the battery cover 30 from the case main body 28, the measurer can easily remove the battery cover 30 by hooking his/her finger in the recess 26 (gap) and separating the battery cover 30 from the case main body 28.

FIG. 5 shows the main body unit 10 with the battery cover 30 removed. FIG. 5 is a perspective view of the main unit 10 as viewed from the back side. The lower case piece 34 is provided with a claw 44 that engages with the battery cover 30 and an engagement hole 46 with which the claw of the battery cover 30 engages along the opening 38. The opening 38 of the lower case piece 34 has an opening edge 48. The opening edge 48 is an inner peripheral surface of the opening 38 and is an inclined surface. As will be described later, a seal member provided on the battery cover 30 contacts the opening edge 48.

By the way, since the above-mentioned radiation measuring apparatus may be used in an environment with much water and dust, a sufficient waterproof function is required. In order to ensure waterproofness, it is necessary that a plurality of case pieces be liquid-tightly assembled. The upper case piece 32 and the lower case piece 34 are precisely assembled beforehand by the manufacturer side, and are rarely disassembled thereafter. Therefore, the waterproofness of the upper case piece 32 and the lower case piece 34 is relatively easy to be secured.

On the other hand, the battery cover 30 is attached/detached to/from the lower case piece 34 by the user every time the battery is replaced. Therefore, it was difficult to maintain high assembly accuracy. Therefore, in the present embodiment, a special seal structure is provided between the lower case piece 34 and the battery cover 30 in order to absorb an assembly error and the like and stably ensure waterproofness. Hereinafter, this seal structure will be described in detail.

FIG. 6 shows an exploded perspective view of the battery cover and the seal member. The seal member 50 is an annular seal member (an endless seal member) that is assembled to the peripheral edge of the battery cover 30. The seal member 50 is made of an elastic body such as rubber and has an appropriate elasticity. The seal member 50 has a shape in which the length in the front-rear direction (length in the Y-axis direction) is longer than the length in the width direction (length in the X-axis direction) in a plan view.

An annular groove member 52 corresponding to the shape of the seal member 50 is provided on the inner surface of the battery cover 30, that is, the surface of the battery cover 30 on the case body 28 side. The groove member 52 is a member protruding from the inner surface of the battery cover 30 toward the case body 28 side. On the outer side surface of the groove member 52, an annular accommodation groove 54 (circumferential groove) is formed along the groove member 52. That is, the housing groove 54 that faces outward is formed on the side surface of the groove member 52. The seal member 50 is housed by being fitted into the housing groove 54.

Further, in the groove member 52, a plurality of recesses 56 are formed in a portion (long side portion) along the front-rear direction (Y-axis direction) so as to be separated in the front-rear direction (Y-axis direction). Each recess 56 is formed in the wall portion of the groove member 52 on the case body 28 side. Each recess 56 has a slit shape and communicates with the accommodation groove 54. In the example shown in FIG. 6, three concave portions 56 are formed on each long side. As will be described later, the convex portions provided on the seal member are inserted into and engaged with the respective concave portions 56.

Although not shown, a convex portion protruding into the accommodation groove 54 is provided at a portion (short side portion) of the accommodation groove 54 along the width direction (X-axis direction). Each convex portion is provided on the wall portion of the groove member 52 on the case body 28 side. As an example, one convex portion is formed on each short side. As will be described later, each convex portion is inserted into and engaged with a concave portion formed in the seal member 50.

The battery cover 30 is a case piece that is made of resin, metal, or the like, and is arranged to face the lower case piece 34. On the inner surface of the battery cover 30, a lock hole 42, a claw 58 to be engaged with the engagement hole 46 of the lower case piece 34, and the like are formed.

A plurality of convex portions 60 are provided in a portion (long side portion) along the front-rear direction (Y-axis direction) of the seal member 50 so as to be separated in the front-rear direction (Y-axis direction). Each convex portion 60 is provided at the end of the seal member 50 on the case body 28 side. Each convex portion 60 is provided at a position corresponding to each concave portion 56 formed in the groove member 52, and has a shape corresponding to each slit-shaped concave portion 56. In the example shown in FIG. 6, three convex portions 60 are provided on each long side, and each convex portion 60 is inserted into and engaged with each corresponding concave portion 56.

Further, in the seal member 50, a concave portion 62 is formed in a portion (short side portion) along the width direction (X axis direction). Each recess 62 is formed in the end of the seal member 50 on the case body 28 side. Each concave portion 62 is formed at a position corresponding to each convex portion provided on the groove member 52, and has a shape into which each convex portion can be inserted. For example, each recess 62 has an elongated shape. In the example shown in FIG. 6, one concave portion 62 is formed on each short side, and a convex portion provided in the accommodation groove 54 is inserted into and engaged with each concave portion 62.

The concavo-convex structure (concave portion 56 and convex portion) provided on the groove member 52 and the concavo-convex structure (convex portion 60 and concave portion 62) provided on the seal member 50 correspond to an example of the seal coupling portion. The engagement of the concavo-convex structures suppresses the rotation of the seal member 50 in the accommodation groove 54 due to the contact of the seal member 50 with the opening edge 48 when the battery cover 30 is mounted in the opening 38. Further, the movement of the seal member 50 in the groove direction (direction along the housing groove 54) in the housing groove 54 is suppressed.

It should be noted that the number of the uneven structures described above is merely an example, and uneven structures other than the above may be provided. Further, the concavo-convex structure provided on the seal member 50 and the groove member 52 may have a structure opposite to the above example. That is, in the seal member 50, the concave portion is provided in the long side portion, the convex portion is provided in the short side portion, and in the groove member 52, the convex portion is provided in the long side portion and the concave portion is provided in the short side portion. You may be asked.

An annular groove 64 is formed along the seal member 50 on the outer side surface of the seal member 50. That is, an outward annular groove 64 is formed on the side surface of the seal member 50. Although not shown, an annular groove is also formed along the seal member 50 on the surface of the seal member 50 on the battery cover 30 side.

The groove member 52 has a rectangular shape in which four sides gently bulge outward. When the seal member 50 is housed in the housing groove 54, an inward elastic force acts on the entire groove member 52. Thereby, the adhesion of the seal member 50 to the housing groove 54 is improved, and the waterproof property of the case 12 is improved.

Hereinafter, the cross-sectional shape of the seal member 50 will be described.

First, with reference to FIG. 7, a cross section of a portion of the seal member 50 where the convex portion 60 is provided will be described. FIG. 7 is a sectional view taken along line CC of FIG. The seal member 50 includes a main leg portion 66, a sub leg portion 68, and a connecting portion 70 that connects the rear end portion (inner end portion) of the main leg portion 66 and the sub leg portion 68. The main leg portion 66 is provided on the battery cover 30 side, and the sub leg portion 68 is provided on the case body 28 side. When the battery cover 30 is attached to the opening 38 of the lower case piece 34, the tip portions (outer end portions) of the main leg portion 66 and the sub leg portion 68 have the opening edge 48 (contact surface) of the lower case piece 34. ), which causes the main leg portion 66 and the sub leg portion 68 to bend and make close contact with the opening edge 48, and a sealing effect is obtained. The main leg portion 66 is thicker than the sub leg portion 68 and projects outward from the sub leg portion 68. The sizes and shapes of the main leg portion 66 and the sub leg portion 68 are determined according to the required sealing pressure, the shape of the opening edge 48 (contact surface) of the lower case piece 34 described later, and the like. By providing the two leg portions, it is possible to further improve waterproofness as compared with the case where only one leg portion is used.

The convex portion 60 is provided on the inner end of the seal member 50 on the case body 28 side. When the sealing member 50 is housed in the housing groove 54 of the battery cover 30, the protrusion 60 is inserted into the recess 56 formed in the battery cover 30.

The annular groove 64 is a groove formed between the main leg portion 66 and the sub leg portion 68, and is an outward groove. The bottom surface 72 of the annular groove 64 is an inclined surface. The bottom surface 72 is, for example, a surface inclined from the outside to the inside from the battery cover 30 to the case body 28. By forming the inclined bottom surface 72 in this way, the length of the sub leg portion 68 becomes longer than in the case where the bottom surface 72 is not inclined. The longer the leg, the easier it is to bend, so that the degree of adhesion between the sub leg 68 and the opening edge 48 (contact surface) is improved, and the sealing effect is improved.

An annular groove 74 is formed along the seal member 50 on the surface of the main leg portion 66 on the battery cover 30 side. By forming the annular groove 74 in the main leg portion 66, even if the main leg portion 66 is thick, the main leg portion 66 is easily bent, so that the main leg portion 66 and the opening edge 48 (contact surface) are in close contact with each other. And the sealing effect is improved.

Further, the surface 76 of the connecting portion 70 that abuts the inner surface of the housing groove 54 is a curved surface. Thereby, when the seal member 50 is inserted into the housing groove 54, the degree of contact between the surface 76 and the inner surface of the housing groove 54 is improved, and the sealing effect is improved.

Next, with reference to FIG. 8, a cross section of a portion of the seal member 50 where the recess 62 is formed will be described. FIG. 8 is a cross-sectional view taken along the line DD of FIG. The recess 62 is formed on the surface of the seal member 50 on the case body 28 side. When the sealing member 50 is housed in the housing groove 54 of the battery cover 30, the convex portion provided on the battery cover 30 is inserted into the concave portion 62.

Next, with reference to FIG. 9, a cross section of a portion of the seal member 50 where the convex portion 60 and the concave portion 62 are not formed will be described. FIG. 9 is a sectional view taken along line EE of FIG. The convex portion 60 and the concave portion 62 are not formed in this portion. The annular grooves 64 and 74 are formed similarly to the other portions.

Hereinafter, the cross-sectional shape of the battery cover 30 will be described.

First, with reference to FIG. 10, a cross section of a portion of the battery cover 30 where the recess 56 is formed will be described. FIG. 10 is a sectional view taken along line FF of FIG. An accommodation groove 54 is formed on the outer side surface of the groove member 52. That is, the housing groove 54 that faces outward is formed on the side surface of the groove member 52. The seal member 50 is housed by being fitted into the housing groove 54. At this time, the surface 76 of the seal member 50 contacts the wall surface 78 of the groove member 52. Further, the recess 56 is formed in the wall portion of the groove member 52 on the case body 28 side, and communicates with the housing groove 54.

Next, with reference to FIG. 11, a cross section of a portion of the battery cover 30 where the convex portion is formed will be described. FIG. 11 is a sectional view taken along line GG of FIG. Similar to the other portions, a housing groove 54 is formed on the outer side surface of the groove member 52. Further, the convex portion 80 is provided in the accommodation groove 54. The convex portion 80 is provided on the wall portion of the groove member 52 on the case body 28 side, and projects in the direction opposite to the case body 28. The convex portion 80 is inserted into and engaged with the concave portion 62 formed in the seal member 50.

Hereinafter, the battery cover 30 with the seal member 50 attached will be described. First, with reference to FIGS. 12 to 14, the manner of engagement between the concave portion 56 of the battery cover 30 and the convex portion 60 of the seal member 50 will be described. 12 is a sectional view taken along the line AA of FIG. 2, and FIGS. 13 and 14 are enlarged views of a portion indicated by reference numeral 82 in FIG. 13 and 14, the illustration of the case body 28 (the upper case piece 32 and the lower case piece 34) is omitted. The seal member 50 is housed in the housing groove 54 of the battery cover 30, and the battery cover 30 is arranged so as to face the lower case piece 34. FIG. 13 shows how the seal member 50 is housed in the housing groove 54. The seal member 50 is slid in the direction of the arrow 84, and the convex portion 60 of the seal member 50 is inserted into the concave portion 56 of the battery cover 30 while the seal member 50 is arranged in the accommodation groove 54. As a result, as shown in FIG. 14, the seal member 50 is housed in the housing groove 54. At this time, the convex portion 60 of the seal member 50 is inserted into the concave portion 56 of the battery cover 30, and the convex portion 60 and the concave portion 56 are engaged with each other. Further, the surface 76 (curved surface) of the seal member 50 contacts the wall surface 78 of the accommodation groove 54.

Next, with reference to FIGS. 15 to 17, the manner of engagement between the concave portion 62 of the seal member 50 and the convex portion 80 of the battery cover 30 will be described. 15 is a sectional view taken along line BB of FIG. 2, and FIGS. 16 and 17 are enlarged views of a portion indicated by reference numeral 86 in FIG. 16 and 17, the illustration of the case main body 28 (the upper case piece 32 and the lower case piece 34) is omitted. FIG. 16 shows how the seal member 50 is housed in the housing groove 54. The seal member 50 is slid in the direction of the arrow 88, and the seal member 50 is arranged in the accommodation groove 54 while inserting the protrusion 80 of the battery cover 30 into the recess 62 of the seal member 50. Thereby, as shown in FIG. 17, the seal member 50 is housed in the housing groove 54. At this time, the convex portion 80 of the battery cover 30 is inserted into the concave portion 62 of the seal member 50, and the convex portion 80 and the concave portion 62 are engaged with each other.

The operation of the seal structure having the above configuration will be described below with reference to FIG. FIG. 18 is an enlarged view of a portion indicated by reference numeral 90 in FIG. The battery cover 30 with the seal member 50 attached is attached to the opening 38 of the lower case piece 34. At this time, the main leg portion 66 and the sub leg portion 68 project toward the opening edge 48 (inclined surface) of the lower case piece 34, and the connecting portion 70 abuts on the wall surface 78 of the accommodation groove 54, so that the sealing member 50. Are accommodated in the accommodation groove 54. The tip of the main leg portion 66 comes into contact with and intimately contacts the inclined opening edge 48. At this time, the tip of the main leg portion 66 is pressed against the opening edge 48 (inclined surface) and bends along the inclination of the opening edge 48, as indicated by reference numeral 66a (dotted line) in FIG. By this bending, the main leg portion 66 and the opening edge 48 are surely brought into close contact with each other, and the portion is sealed. Further, since the annular groove 74 is formed in the main leg portion 66, the main leg portion 66 is easily bent at that portion. Therefore, the degree of adhesion between the main leg portion 66 and the opening edge 48 is improved, and the sealing effect is improved. Similarly, the tip of the sub leg portion 68 comes into contact with and is in close contact with the inclined opening edge 48. At this time, the tip of the sub leg portion 68 is pressed against the opening edge 48 and bends along the inclination of the opening edge 48, as indicated by reference numeral 68a (dotted line) in FIG. By this bending, the sub leg portion 68 and the opening edge 48 are surely brought into close contact with each other, and that portion is sealed. Further, since the bottom surface 72 of the annular groove 64 is formed obliquely, the sub leg portion 68 becomes longer, and the sub leg portion 68 is easily bent. Therefore, the degree of adhesion between the sub leg portion 68 and the opening edge 48 is improved, and the sealing effect is improved. In this embodiment, there are two types of seal structures, a seal structure including the opening edge 48 and the main leg portion 66, and a seal structure including the opening edge 48 and the sub leg portion 68. With these two types of seal structures, the waterproof property of the main body unit 10 is further improved.

Further, in the present embodiment, the convex portion 60 of the seal member 50 is inserted into the concave portion 56 of the battery cover 30, the convex portion 60 and the concave portion 56 are engaged, and the convex portion 80 of the battery cover 30 becomes the concave portion of the seal member 50. It is inserted in 62, and the convex part 80 and the concave part 62 are engaging. Since the seal member 50 is engaged with the battery cover 30 by such a concavo-convex structure, when the battery cover 30 is attached to the lower case piece 34, the seal member 50 rotates (for example, twists) in the housing groove 54. ) Is suppressed, and movement (for example, shift) of the seal member 50 in the groove direction (direction along the groove 54) in the groove 54 is suppressed. Since rotation (twisting) and movement (displacement) of the seal member 50 are suppressed, the adhesion between the seal member 50 and the opening edge 48 is improved, and the waterproofness of the main body unit 10 is further improved.

Further, in the present embodiment, the seal member 50 is the same component integrally molded with the same material. The seal member 50 is composed of the main leg portion 66, the sub leg portion 68, and the connecting portion 70, and the seal member 50 has a simple shape. Therefore, the seal structure according to the present embodiment is relatively inexpensive and can be easily obtained, and an increase in the number of parts can be prevented. That is, according to the present embodiment, it is possible to ensure waterproofness with a simpler configuration.

10 main body unit, 12 case, 26, 56, 62 concave part, 28 case main body, 30 battery cover, 32 upper case piece, 34 lower case piece, 38 opening part, 40 battery accommodating chamber, 48 opening edge, 50 sealing member, 52 Groove member, 54 accommodation groove, 60, 80 convex portion, 64, 74 annular groove, 66 main leg portion, 68 sub leg portion, 70 connecting portion.

Claims (8)

In a radiation measurement device that measures radiation,
A battery accommodating chamber for accommodating a battery, and a case body having an opening communicating with the battery accommodating chamber,
A lid that has an outer circumferential groove and is attached to the opening;
A seal member, which is fitted into the peripheral groove and serves as an annular elastic body that seals between the case body and the lid,
A seal coupling portion provided on the circumferential groove and the seal member,
Including
The opening has an inclined opening edge with which the seal member abuts,
The seal coupling portion suppresses rotation of the seal member within the circumferential groove due to contact of the seal member with the opening edge when the lid is attached to the opening, and the circumference. Suppressing the movement of the seal member in the groove in the groove direction,
A radiation measuring device characterized by the above. The radiation measuring apparatus according to claim 1,
The seal coupling part is a plurality of uneven structures provided in the seal member and the circumferential groove,
A radiation measuring device characterized by the above. The radiation measuring apparatus according to claim 2,
The concavo-convex structure includes one of a concave portion and a convex portion provided at an end portion on the case body side of the seal member, and a concave portion and a convex portion provided on a wall portion of the case main body side in the circumferential groove. Including the other and
A radiation measuring device characterized by the above. The radiation measuring apparatus according to claim 3,
The long side of the sealing member is provided with a convex portion in the concave-convex structure, and the long side of the circumferential groove is provided with a concave portion in the concave-convex structure.
On the short side of the sealing member, a concave portion in the concave-convex structure is provided, and on the short side of the peripheral groove, a convex portion in the concave-convex structure is provided.
When the lid is attached to the opening, the convex portion and the concave portion on the long side engage, and the convex portion and the concave portion on the short side engage.
A radiation measuring device characterized by the above. The radiation measuring apparatus according to any one of claims 1 to 4,
The circumferential groove has a rectangular shape with four sides bulging outward,
In a state where the seal member is fitted in the circumferential groove, an inward elastic force acts on the entire circumferential groove,
A radiation measuring device characterized by the above. The radiation measuring apparatus according to any one of claims 1 to 5,
The seal member includes a main leg portion, a sub leg portion arranged closer to the case body than the main leg portion, and a connecting portion connecting an end portion of the main leg portion and an end portion of the sub leg portion. Has,
An outward annular groove is formed between the main leg portion and the sub leg portion,
A radiation measuring device characterized by the above. The radiation measuring apparatus according to claim 6,
The bottom surface of the annular groove is an inclined surface,
A radiation measuring device characterized by the above. The radiation measuring apparatus according to claim 6 or 7,
An annular groove for bending the main leg is formed on the lid-side surface of the main leg.
A radiation measuring device characterized by the above.