WO2014112467A1

WO2014112467A1 - Personal dosimeter

Info

Publication number: WO2014112467A1
Application number: PCT/JP2014/050438
Authority: WO
Inventors: 寿和谷野; 花谷　智則; 雄二郎芥
Original assignee: 日立アロカメディカル株式会社
Priority date: 2013-01-16
Filing date: 2014-01-14
Publication date: 2014-07-24
Also published as: JP2014137255A; JP5629334B2; CN104937439A; CN104937439B

Abstract

A personal dosimeter comprises a main body provided with a radiation detector, and an attachment mechanism detachably mounted to the main body. The main body has a right end part and a left end part. The attachment mechanism has a right mounting member and a left mounting member. In a state in which the attachment mechanism is mounted to the main body, the right end part is surrounded by the right mounting member, and the left end part is surrounded by the left mounting member. Consequently, it is possible to firmly join the attachment mechanism to the main body. The attachment mechanism has a clip member. The clip member comprises a pressing bar, and two arms for holding the pressing bar. A cloth or the like is put between the pressing bar and the front surface of the main body. An impact from the front is softened by the clip member.

Description

Personal dosimeter

The present invention relates to a personal dosimeter, and more particularly to a portable personal dosimeter used for exposure management.

Personal dosimeters are radiation measuring instruments used for exposure management of workers engaged in work in facilities that handle radioactive materials or radiation, or for general human exposure management. A personal dosimeter usually has a radiation sensor, an electronic circuit and a battery. The radiation sensor measures radiation (for example, gamma rays). In the electronic circuit, the dose, dose equivalent, accumulated dose, accumulated dose equivalent, and the like are calculated based on the output signal from the radiation sensor, and the calculation result is displayed on the display. Personal dosimeters are typically placed inside or outside the chest pocket of an operator or the like. A personal dosimeter may be attached to the belt. A personal dosimeter may be hung from the neck using a string.

Clip members and attachment members are used to attach personal dosimeters to clothing. Such a member sandwiches a cloth or a belt. A typical personal dosimeter in the past includes a clip mechanism. The clip mechanism includes a clip piece that opens and closes (seesaw movement), and a metal spring that exerts an elastic force on the clip piece. For example, a pocket cloth is inserted between the end of the clip piece and the surface of the personal dosimeter, and the cloth is pressed to the surface side by the end of the clip piece. When the personal dosimeter is worn, the head of the personal dosimeter is usually exposed from the upper side of the pocket. A radiation sensor is arranged in such a head. Patent Documents 1 and 2 show examples of conventional personal dosimeters.

JP 2002-131435 A JP-A-8-313634

Since personal dosimeters continuously monitor exposure that occurs in workers and the like, it is required that the wearing mechanism be able to maintain a good wearing state regardless of the movement of such a person. In this regard, when a thin mounting piece is used as the mounting mechanism, it can be pointed out that the personal dosimeter mounted in the breast pocket tends to tilt or swing.

External members may collide with the personal dosimeter. It is necessary to protect the personal dosimeter body as much as possible from the impact force. In particular, the front side of the personal dosimeter is usually facing the outside, and in such a posture, it is required to mitigate the impact force applied to the front side of the personal dosimeter.

An object of the present invention is to obtain a good wearing state in a personal dosimeter. Alternatively, it is an object of the present invention to protect a personal dosimeter from external impacts. Alternatively, an object of the present invention is to reduce the number of parts constituting the personal dosimeter, thereby realizing cost reduction and good assemblability.

The personal dosimeter according to the present invention includes a main body case having a right end portion and a left end portion and containing a radiation sensor, and an attachment mechanism provided in the main body case. The attachment mechanism includes a right attachment member, a left attachment member, and a clip member. The right mounting member includes an upper right hook portion that is hooked on an upper end portion of the right end portion, and a lower right hook portion that is hooked on a lower end portion of the right end portion. The left mounting member includes an upper left hook portion that is hooked on an upper end portion of the left end portion, and a lower left hook portion that is hooked on a lower end portion of the left end portion. The clip member is a member that connects the right mounting member and the left mounting member through the front surface side or the rear surface side of the main body case, and sandwiches a cloth or the like between the front surface or the rear surface of the main body case. For pressing bar.

According to the above configuration, the right mounting member of the attachment mechanism holds the right end portion of the main body case, and the left mounting member of the attachment mechanism holds the left end portion of the main body case. As a result, the attachment mechanism is firmly attached to the main body case. In this state, the attachment mechanism is not easily detached from the main body case even if a force in the vertical direction, the left and right direction, or the front and rear direction acts on the main body case. Since the attachment mechanism itself has a form suitable for attachment, fixing means such as screws can be made unnecessary or minimized. Of course, it is also possible to fix the attachment mechanism to the main body case by using means such as an adhesive. Each attachment portion (right attachment portion, left attachment portion) desirably has a form like a closed loop, but each attachment is assumed to have a form of a non-closed loop as long as a hook action can be generated in the vertical direction. You may comprise a part.

In the above configuration, the main part or a part of the entire edge of the main body case is surrounded by the attachment member, or the attachment member is disposed along the edge, so that the attachment member removes the case main body from the collision of the external member. Demonstrate the protective effect. In particular, when the pressing bar and the structure for supporting it are provided on the front side of the case body, the front side can be effectively protected by the attachment mechanism.

Further, according to the above configuration, since the pressing bar is provided so as to cross the front surface or the rear surface of the case main body, the cloth of the breast pocket can be securely sandwiched by the pressing bar, and the sandwiched state can be stably Can be maintained. When the pressing part that exerts the pressing action when sandwiched is a small and narrow part, the personal dosimeter is likely to be tilted, swung, or misaligned. On the other hand, according to the pressing bar, the pressing part spreads in the left-right direction (or in the horizontal direction), so that the posture of the attached personal dosimeter can be stabilized.

Preferably, the clip member extends from the right mounting member to the pressing bar, and extends from the left mounting member to the pressing bar, a right arm that urges the pressing bar toward the main body case. A left arm that urges the pressing bar toward the main body case. According to this configuration, the pressing bar can be pressed to the main body case side by the elastic action of the right arm and the left arm. Preferably, two elastic forces are simultaneously applied in parallel to both ends of the pressing bar. According to this, the pinching action by the pressing bar can be enhanced. According to this configuration, there is no need to provide a plurality of metal springs, and the number of parts can be reduced. However, it is possible to use such a spring together.

Preferably, the right arm extends downward from the upper part of the right mounting member, the left arm extends downward from the upper part of the left mounting member, and the pressing bar is higher than an intermediate height on the front side of the main body. Is also provided on the lower side, and the upper part of the front surface of the case body above the pressing bar is open. According to this configuration, when the pressing bar is provided on the front side, the pressing bar is not positioned in front of the sensor, so that the problem of radiation attenuation due to the pressing bar being positioned in front of the sensor can be avoided. In addition, since the state of deep penetration into the pocket can be easily formed, it is possible to effectively prevent the personal dosimeter from dancing in the pocket and the personal dosimeter from falling out of the pocket.

Preferably, each of the right arm and the left arm has an S shape when viewed from the side, and the S shape includes a root portion, a mountain portion, a valley portion, and a warped portion that are continuous from the top to the bottom. . Since each arm has an S shape, it can exhibit a natural elastic action depending on its shape, and can give a soft and soft impression, so it can look good and relieve psychological resistance. it can. In particular, if a configuration in which the peak portion of each arm is raised forward is adopted, a member colliding from the front can be received by the two peak portions to reduce the impact.

Desirably, the pressing bar is inclined with respect to the main body case, and a gap formed between the back surface of the pressing bar and the front surface of the main body case increases from the upper side to the lower side. According to this configuration, since it is easy to put a fingertip from the lower side into the gap, operability can be improved. At the same time, it becomes easy to insert an object to be attached such as a cloth into the gap.

Desirably, the right mounting member includes a right mounting member main body, a right connecting part, a left mounting part main body, and a left connecting part. The right attachment portion main body includes the upper right hook portion, the lower right hook portion, and a right front portion continuous with the upper right hook portion and the lower right hook portion on the front side of the main body case. The right connecting part is a part that connects between a rear end of the upper right hook portion and a rear end of the lower right hook portion on the back side of the main body case. The left attachment portion main body includes the upper left hook portion, the lower left hook portion, and a left front portion that is continuous with the upper left hook portion and the lower left hook portion on the front surface side of the main body case. The left connecting part is a part that connects the rear end of the upper left hook part and the rear end of the lower left hook part on the back side of the main body case. According to this configuration, each mounting member has a loop shape that completely surrounds each end portion of the main body case, whereby the entire periphery of each end portion can be surrounded. When removing each attachment member from each end, each connecting component may be removed from each attachment member body.

Preferably, the main body case includes a front case and a rear case, and a plurality of screwing structures for fixing the rear case to the front case are provided, and the right connecting component and the left connecting component are Covering the plurality of screwing structures. According to this configuration, the appearance can be improved. Desirably, the attachment mechanism is detachably provided to the main body case. It is also possible to prepare a plurality of types of attachment mechanisms and selectively use an optimal attachment mechanism in accordance with a desired mounting site and mounting method. For example, the pressing bar may be provided on the back side of the main body case, and the fabric may be sandwiched on the back side of the main body case. In this configuration, the main body case is provided on the front side of the breast pocket.

It is a 1st perspective view which shows suitable embodiment of the personal dosimeter based on this invention. It is a 2nd perspective view of the personal dosimeter shown in FIG. It is a rear view of the personal dosimeter shown in FIG. It is a perspective view which shows the attachment mechanism shown in FIG. It is a perspective view which shows the main body of the personal dosimeter shown in FIG. It is a side view of the personal dosimeter shown in FIG. It is a front view of the personal dosimeter shown in FIG. FIG. 8 is a cross-sectional view showing an AA cross section in FIG. 7. FIG. 8 is a cross-sectional view showing a BB cross section in FIG. 7. It is a figure which shows the state which removed the front case in the personal dosimeter. It is sectional drawing which shows CC cross section shown in FIG. It is an expanded sectional view of a holding structure. It is a figure which shows a seal structure. It is a figure for demonstrating the effect | action in a seal structure. It is a perspective view which shows packing (packing) and a protrusion (elongated protrusion) row | line | column. It is a perspective view which shows packing and a seal groove.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(1) Description of Basic Configuration FIG. 1 shows a preferred embodiment of a personal dosimeter according to the present invention, and FIG. 1 is a perspective view thereof. The personal dosimeter 10 is attached to a worker who works in a facility that handles radiation or radioactive materials. Of course, a personal dosimeter may be attached to the general public. The personal dosimeter is used in personal exposure management, and has a function of measuring and displaying a dose, a dose equivalent, an integrated dose, an integrated dose equivalent, and the like. In the present embodiment, the personal dosimeter is attached to the breast pocket as described below. However, it may be attached to other parts.

In FIG. 1, the personal dosimeter 10 roughly includes a main body 12 and an attachment mechanism 14. The main body 12 has a substantially rectangular parallelepiped shape, and in a coordinate system based on the main body 12, a right end portion 16 is provided on the right side of the main body 12, and a left end portion 18 is provided on the left side of the main body 12. ing. Each of the

end portions

16 and 18 is a portion protruding to one side or the other side in the horizontal direction. Moreover, each

end part

16 and 18 is extended in the up-down direction in FIG. 1, and has a form like an ellipse seeing from the side surface direction.

The main body 12 has a main body case as will be described later, and a semiconductor sensor as a radiation sensor is provided in the main body case. The semiconductor sensor is disposed in the upper part in the main body 12. In FIG. 1, the radiation (gamma rays) detected by the semiconductor sensor is indicated by reference numeral 20. Electronic parts such as a board, a battery, an electronic circuit, and a buzzer are further provided inside the main body case. The upper surface 12A of the main body 12 is slightly inclined toward the front side. A display 26 is provided on the upper surface 12A. The display 26 is a liquid crystal display, for example. An LED 28 is further provided on the upper surface 12A.

In the front surface 12B of the main body 12, an opening 24 for outputting a buzzer sound is formed slightly above the intermediate level. A switch portion 29 is provided on the side surface of the left end portion 18. The switch unit 29 is constituted by two push switches in the present embodiment. Thus, in this embodiment, the operation part in the personal dosimeter 10 is provided in the main body side surface. As described above, since the upper surface 12A of the main body 12 is inclined, it is easy to see the indicator 26 provided there.

Next, the attachment mechanism 14 will be described. The attachment mechanism 14 is detachably attached to the main body 12. Specifically, the attachment mechanism 14 includes a right attachment member 30, a left attachment member 32, and a clip member 34. The right attachment member 30 is a member attached to the right end portion 16, and specifically, is configured as a member that surrounds the periphery of the right end portion 16 like an endless track (endless track). Similarly, the left attachment member 32 has a form surrounding the left end 18. In the example shown in FIG. 1, the clip member 34 is a member provided between the right mounting member 30 and the left mounting member 32 so as to connect them. In the illustrated example, a clip member 34 is provided on the front side of the main body 12. In FIG. 1, reference numeral 36 represents a breast pocket, and a fabric 36 A on the front side is sandwiched between the clip member 34 and the front surface 12 B of the main body 12. As will be described in detail later, the clip member 34 includes a pressing bar 46 that sandwiches and has two arms for applying an elastic force to the pressing bar 46. As shown in FIG. 1, the pressing bar 46 extends in the left-right direction, that is, in the horizontal direction, and can press the fabric 36A with a relatively long distance or with an expanded area.

Fig. 2 shows a perspective view of the personal dosimeter viewed from another direction. An insertion hole 38 is formed in the upper portion of the right end portion 16 described above. The insertion hole 38 is a slit for piercing or hooking the strap. A circular opening is formed in the lower portion of the right end portion 16, and a cap 36 is inserted therein. The cap 36 is a member that closes the opening of the storage chamber that stores the battery. The cap 36 can be attached to the opening by rotating the cap 36 in one direction, and the cap 36 can be removed from the opening by rotating the cap 36 in the other direction. In the present embodiment, the battery is provided on the bottom inside the main body so as to lie down horizontally.

Fig. 3 shows the back of the personal dosimeter. Reference numeral 40 indicates a light emitting element and a light receiving element for performing communication using infrared rays. The back surface constitutes a substantially flat surface. Incidentally, it is also possible to attach the attachment mechanism so that the above-mentioned pressing bar is provided on the back side of the main body. In such a case, the body is mounted on the front side of the breast pocket while the fabric is sandwiched between the pressing bar and the back surface.

4 and 5 show the attachment mechanism 14 and the main body 12 in a separated state. First, the main body 12 will be described again with reference to FIG. The main body 12 has the right end portion 16 and the left end portion 18 as described above. These

end portions

16 and 18 have a form protruding outward as viewed from the main body 12, and mounting

grooves

43 and 45 are formed in them. The right mounting member 30 and the left mounting member 32 described above are fitted into the mounting

grooves

43 and 45. The right end portion 16 has an upper end portion 16A and a lower end portion 16B. Similarly, the left end portion 18 has an upper end portion 18A and a lower end portion 18B.

Next, the attachment mechanism 14 will be described in detail with reference to FIG. As described above, the attachment mechanism 14 includes the right mounting member 30, the left mounting member 32, and the clip member 34. The right attachment member 30 includes a right attachment member main body 47 and a connecting part 48. The right mounting member main body 47 has a hook portion 30A that is hooked from above on the upper end portion 16A of the right end portion 16, and has a hook portion 30B that is hooked from below on the lower end portion 16B of the right end portion 16. Yes. On the front side of the main body 12, the hook portion 30 A and the hook portion 30 B are continuous, and that portion constitutes the front portion. Their rear ends are connected by a connecting part 48.

Similarly, the left mounting member 32 includes a left mounting member main body 49 and a connecting component 50. The left mounting member main body 49 has a hook portion 32A that is hooked from above on the upper end portion 18A of the right end portion 18, and has a hook portion 32B that is hooked from below on the lower end portion 18B of the left end portion 18. . On the front side of the main body 12, the hook portion 32A and the hook portion 32B are connected by the front side portion. These rear ends are connected by a connecting component 50.

In the mounting groove 43 described above, the right mounting member 30 having a strip shape and a loop shape is fitted. Similarly, a left attachment member 32 having a belt-like and loop shape is fitted into the attachment groove 45. The attachment mechanism 14 is firmly attached to the main body 12 by fitting the

attachment members

30 and 32 into the

attachment grooves

43 and 45. Even if a force is applied to the attachment mechanism 14 in the up-down direction, the left-right direction, or the front-rear direction, the attachment mechanism 14 is not easily detached from the main body 12. This is because the mounting

members

30 and 32 completely hold the

end portions

16 and 18.

The clip member 34 is a member that connects the right mounting member 30 and the left mounting member 32 on the front surface side. Specifically, the clip member 34 includes a right arm 42, a left arm 44, and a pressing bar 46. The right arm 42 and the left arm 44 have an S shape when viewed from the side. The base portion of the right arm 42 is integrated with the right mounting member 30. The right arm 42 has a form extending downward from the attachment portion, and its lower end is integrated with one end of the pressing bar 46. Similarly, the base portion of the left arm 44 is integrated with the left mounting member 32. Further, the lower end of the left arm 44 is integrated with the other end of the pressing bar 46.

The right arm 42 includes a root portion 42A connected to the right mounting member 30, a mountain portion 42B having a mountain shape that rises forward from there, and a valley portion 42C that is provided at the tip and falls to the main body 12 side. And a warped part 42D that warps forward in the forward direction. Similarly, the left arm 44 has a root portion 44A, a mountain portion 44B, a valley portion 44C, and a warped portion 44D. The pressing bar 46 is held by the pair of

arms

42 and 44 having such a configuration. Thereby, an elastic biasing force toward the main body 12 is exerted on the pressing bar 46. The pressing bar 46 receives substantially the same elastic force at both ends thereof.

The pressing bar 46 is provided slightly below the intermediate level on the front side of the main body 12. It is configured as a member extending in the horizontal direction. The pressing bar 46 constitutes a handle that is slightly wider in the vertical direction. It is possible to insert a fingertip from the lower side of the pressing bar and lift it slightly upward. When the fabric is inserted from below, the fabric is first received by the wedge-shaped gap formed on the back side of the pressing bar 46, and then the fabric is inserted into the slit formed on the back side of each

arm

42, 44. Plugged in. The clip member 34 is made of resin, for example.

The right mounting member main body 47 and the connecting part 48 are connected by two

knobs

52A and 52B in the example shown in FIG. Similarly, the left mounting member main body 49 and the connecting component 50 are connected by two

knobs

54A and 54B. In addition to or in place of such a fitting method, an adhesive method, a screwing method, and other methods can be employed.

Fig. 6 shows a side view of the personal dosimeter. As shown in the figure, the upper surface 12A of the main body 12 is inclined by an angle θ with respect to the horizontal plane (the non-biological side is lower than the living body side in the upper surface 12A). Thereby, the visibility of a display part is improving. In the attachment mechanism, the pressing bar 46 is connected to a lower end portion of an arm having an S shape as viewed from the side. The width in the front-rear direction (that is, the thickness) of each arm gradually decreases from the upper side to the lower side. Conversely, a thick structure is employed at the base of the arm. As a result, it is possible to reliably exert an elastic action. A gap (wedge-shaped slit) that opens downward is formed on the back side of the pressing bar 46. The fabric is inserted into such a gap. In addition, the personal dosimeter can be attached to and detached from the fabric by inserting a fingertip into the gap and hooking the fingertip on the back surface of the pressing bar 46 to move the pressing bar 46 away from the main body 12. A protrusion 46A extending in the horizontal direction is provided on the back side of the pressing bar 46, and the protrusion 46A is in contact with the front surface 12B of the main body 12. The protruding portion 46A is made of, for example, a rubber-like member that is softer than the pressing bar 46. This makes it possible to securely hold the fabric. By holding while increasing the frictional force, it is possible to stably maintain the wearing posture of the personal dosimeter.

As described above, each end has a shape like an ellipse extending in the vertical direction when viewed from the side, its upper end has a semicircular shape, and its lower end also has a semicircular shape. is doing. Each attachment member is provided so that the circumference | surroundings of each edge part which has such a form may be surrounded. Incidentally, the attachment portion of each arm is set at a slightly upper position on the front side of the main body 12, as shown in FIG. There is no pressing bar on the front side of the semiconductor sensor. Thereby, it is possible to avoid the problem of radiation attenuation due to the pressing bar. That is, the upper side of the main body 12 is opened above the intermediate level on the front side. Specifically, the center height level of the semiconductor sensor is set further above the upper end level of the slit formed on the back side of each arm.

Fig. 7 shows a front view of the personal dosimeter. The AA cross section in FIG. 7 is shown as a cross-sectional view in FIG. 8, and the BB cross section in FIG. 7 is shown as a cross-sectional view in FIG.

As shown in FIG. 8, the left mounting member 32 includes a left mounting end body 49 and a connecting component 50. The inner side of the left attachment member 32 is a left end portion, and specifically includes a part of the rear case 52 and a part of the front case 54. The rear case 52 and the front case 54 are connected by

screws

56 and 58. The heads of the

screws

56 and 58 are located on the bottom surfaces of the

holes

61 and 63, that is, the

screws

56 and 58 are provided at positions that enter the back side from the back surface level. The opening surfaces of the

holes

61 and 63 are covered with the connecting component 50. Knobs 54 A and 54 B provided at the upper and lower ends of the connecting part 50 enter the

holes

61 and 63. Therefore, since the

screws

56 and 58 are concealed by the connecting part 50, the appearance can be improved, and the

holes

61 and 63 are used as spaces for receiving the insertion end portions of the

knobs

54A and 54B. There is no need to form a separate hole for the

knobs

54A, 54B.

In FIG. 9, a rear case 52 and a front case 54 constitute a main body case, and a substrate 58 is provided inside the main body case. The substrate 58 is elastically held by a holding structure described in detail later. An electronic circuit is mounted on the substrate 58, and a sensor unit 56 is disposed. The sensor unit 56 has an aluminum case and a semiconductor sensor disposed therein. Reference numeral 20 represents the radiation entry direction. Some electronic components are vulnerable to impacts, such as semiconductor sensors. In particular, when an impact is applied to the semiconductor sensor, there is a risk of erroneous counting. Therefore, in this embodiment, the elastic action is exhibited in the three holding structures that hold the substrate 58 as described below.

Personal dosimeters are used indoors as well as outdoors. Therefore, it is necessary to provide a sufficient sealing property between the rear case 52 and the front case 54. For this reason, in this embodiment, the special structure for improving a sealing performance is employ | adopted, and it demonstrates later.

4 is a member that connects between the rear end portion of the upper hook portion and the rear end portion of the lower hook portion in the attachment member

main bodies

47 and 49. As shown in FIG. It is also possible to integrally form the connecting

parts

48 and 50 and the attachment portion

main bodies

47 and 49. As long as the clip member 34 can be reliably arranged, each mounting member can be made of a material having an elastic action.

According to the attachment mechanism described above, it is possible to hold the two end portions formed on both side surfaces of the main body to form a connected state, so that the attachment mechanism 14 itself can be firmly attached to the main body 12. . In addition, the main part of the edge of the main body 12 is covered by the attachment mechanism, or the attachment mechanism 14 is provided along the edge of the main body 12, so that the impact force on the main body 12 from various directions can be applied. It can be mitigated by the attachment mechanism 14. In particular, in the present embodiment, two raised arms are provided on the front side of the main body 12, and a pressing bar that is warped is provided. Therefore, in the case where another member collides with the personal dosimeter from the front. The impact force can be received by the elastic action of the two arms to relieve it and protect the body of the personal dosimeter. For example, even when the main body 12 falls with its front surface facing down, the impact force can be greatly reduced by the elastic action of the two arms. As a result, it is possible to protect the semiconductor sensor and the like.

In addition, according to the present embodiment, the pressing bar has a shape that spreads in the horizontal direction, and can press down the fabric with a relatively long path or a large area, which is combined with the sandwiching action of the fabric by the two slits. It is possible to stably maintain the wearing state of the personal dosimeter. Furthermore, in this embodiment, since the elastic action is exhibited by the two arms formed integrally with the two attachment members, there is an advantage that it is not necessary to provide a metal spring or the like. Since substantially uniform elastic urging force is applied to both ends of the pressing bar, the pressing bar can be reliably urged toward the apparatus main body, and there is no problem of scraping.

As described above, according to the attachment mechanism, it is possible to provide an extremely practical personal dosimeter.

(2) Description of Holding Structure FIG. 10 shows a personal dosimeter with the front case removed. A substrate 58 is provided in the main body case, specifically, in the rear case 52. An electronic circuit is mounted on the substrate 58, and a sensor unit 56 is provided. The sensor unit 56 has a front aluminum case and a rear aluminum case, and a semiconductor sensor 60 is provided in a space enclosed by them. In order to fix the substrate 58 between the rear case 52 and the front case, three holding structures are provided in the present embodiment. Each holding structure has

rubber legs

66, 68 and 70. The rubber leg 66 is provided above the center position of the substrate 58, the rubber leg 68 is provided on one lower side of the substrate 58, and the rubber leg 70 is provided on the other lower side of the substrate 58. That is, the substrate 58 is held at three locations. A CC cross section in FIG. 9 is shown as a cross sectional view in FIG. In addition, the code | symbol 69 represents the battery storage chamber, and the opening part 67 is comprised as a space connected to it. A cap holder is arranged there. In addition, illustration of the attachment mechanism is abbreviate | omitted in FIG.

In the cross-sectional view shown in FIG. 11, a substrate is disposed between the rear case 52 and the front case 54. In the example shown in FIG. 11, one holding structure is shown, which has rubber legs 66. The rubber leg 66 functions as a spacer and a vibration-proof bush, and it is a single member. The enlarged view of the part shown by the code | symbol 72 is FIG. 12 demonstrated later.

The seal part is constituted by the opening edge of the rear case 52 and the opening edge of the front case 54. Specifically, the seal portion includes a seal groove 62 provided on the front case 54 side, a packing 64 disposed therein, and a pressing body formed on the rear case 52 side. These will be described in detail later. FIGS. 13 and 14 described later correspond to enlarged views of a portion indicated by reference numeral 74.

12, a substrate 58 having a horizontal state in FIG. 12 is provided between a lower rear case 52 and an upper front case. In FIG. 12, the vertical direction is the front-rear direction when the personal dosimeter is in use.

The substrate 58 is held in the main body case by the holding structure 76. The holding structure 76 includes a first holding part 78 and a second holding part 80 in view of its function. The first holding portion 78 holds the substrate 58 on the first surface (front surface) 58A side, and the second holding portion 80 holds the substrate 58 on the second surface (rear surface) 58B side. is there. The first holding portion 78 includes a support column 92, a projecting portion 82 formed at an end of the support column 92, and a contact surface 92 A that forms a peripheral surface of the projecting portion 82. The second holding portion 80 has a protruding portion 86 that is erected from the rear case 52 and a contact surface around the protruding portion 86 on the rear case inner surface 52A.

An elastic member, specifically, a rubber leg 66 made of rubber is provided across the first holding part 78 and the second holding part 80. The rubber leg 66 functions as a spacer between the first surface 58A of the substrate 58 and the contact surface 92A and also exhibits a positioning action, and a neck 66B that is connected to the through hole 58C of the substrate 58. The body 66C functions as a spacer and exhibits a positioning action between the second surface 58B of the substrate 58 and the inner surface 52A of the rear case 52.

More detailed explanation. The support column 92 stands up from the inner surface of the front case 54 and extends toward the rear case 52 side. The support column 92 has a cylindrical shape, and a protruding portion 82 is formed as a cylindrical portion protruding from the end surface toward the rear case 52 side. The end surface of the protrusion 82 is close to the first surface 58 A of the substrate 58. That is, the end face level and the level of the first face 58A are substantially the same or close to each other. As described above, the periphery of the projecting portion 82 of the support column 92 is the contact surface 92A, and the end surface of the head 66A is in contact with the contact surface 92A.

The head 66A has a slightly tapered shape toward the front case 54, and the head 66A has a size and a shape that penetrates the through hole 58C. A well-like opening 84 is formed in the head 66A, and the protrusion 82 is inserted into the well. A slight gap is generated between the end surface of the protrusion 82 and the bottom surface of the opening 84.

As described above, since the head 66A is disposed between the contact surface 92A and the first surface 58A, the impact from the front case 54 is mitigated by the head 66A. Since the bottom surface of the opening 84 matches the level of the first surface 58A and the end surface of the hard protrusion 82 approaches the vicinity of the first surface 58A, the spacers or the vibration-proofing action are exerted on the head 66A. The lateral and vertical displacements of the substrate 58 with respect to the front case 54 are limited within a certain range. As a result, it is possible to effectively avoid the problem that the board 58 and the components mounted thereon collide with surrounding members. The above is the operation of the first holding part 78.

A through hole 58C as a circular opening is formed in the substrate 58, and a head 66A is inserted into the substrate 58 from the second surface 58B side. Then, as shown in FIG. 1, the head 66A protrudes toward the first surface 58A, and as a result, the annular groove of the neck 66B is fitted into the through hole 58C. Thereby, the rubber legs 66 are integrated with the substrate 58. Since the rubber legs 66 are made of an insulating member, the insulation of the substrate 58 is also ensured. When the rubber legs 66 are attached to the substrate 58, the above-described fitting method is used, that is, screwing or the like is unnecessary, so that the number of parts can be reduced and the assemblability can be improved. The same advantage can be pointed out with respect to fixing the rubber legs 66 to the front case 54 and the rear case 52.

The body 66C is a portion provided between the second surface 58B and the abutting surface of the inner surface 52A, and it exhibits a spacer function, a vibration isolating function, and a positioning function. The horizontal sectional size of the body 66C is slightly larger than the horizontal sectional size of the head 66A. The thickness in the vertical direction of the body 66C is considerably larger than the thickness in the vertical direction of the head 66A.

The body 66C has an opening 90 facing downward in FIG. 12, and a hard protrusion 86 is inserted into the opening. The protrusion 86 has a well-shaped hole 88 at the center thereof. The opening 90 has a shape that gradually becomes deeper toward the bottom surface thereof, that is, the upper surface in FIG. 12, and the protrusion 86 has a shape that tapers upward accordingly. Yes. The protrusion 86 has a cylindrical or conical shape. The end surface of the protrusion 86 is separated from the second surface 58B to some extent, and a certain thickness exists between the bottom surface of the opening 90 and the second surface 58B.

Therefore, according to the body 66C, vibration transmitted from the rear case 52 to the substrate 58 can be effectively mitigated, and insulation can be secured. In the state where the neck 66B is fitted in the through hole 58C, the projecting portion 86 which forms a part of the rear case 52 is inserted into the opening 90, so that a horizontal positioning action can be obtained. Moreover, since the protrusion part 86 has a taper form and the opening part 90 has a deep form, insertion of the protrusion part 86 to the opening part 90 is easy. In the body 66C, there is a certain thickness between the second surface 58B and the end surface of the projecting portion 86 or the side surface of the opening 90, and considering the elastic deformation there, the substrate 58 with respect to the rear case 52. It can be said that the lateral displacement and the longitudinal displacement in are allowed to some extent. Therefore, since there is such a degree of freedom, the substrate 58 is securely fixed inside the two cases even if there is a positional deviation between the front case 54 and the rear case 52 or an error in molding of each case. Is possible. The above is the operation of the second holding unit 80. An upper portion (right end portion in FIG. 12) of the front case 54 is a partition wall 54B, which constitutes a bottom wall of a groove portion that accommodates the display unit. A seal groove 62 is formed in the partition wall 54B, and a packing 64 is fitted therein.

As described above, according to the holding structure in the present embodiment, it is possible to reduce the impact force on the substrate by using the rubber legs. In particular, since the lateral displacement and longitudinal displacement of the substrate are limited to some extent with respect to the case on one side, it is possible to avoid the substrate itself or components on the substrate from colliding with surrounding members. Further, on the second surface side of the substrate, there is a body having a thickness, which allows a certain amount of lateral displacement and longitudinal displacement in the substrate, so there is no positional deviation or molding error between the two cases. Even if it can be absorbed by the body. In addition, since there is a body having a thickness as a whole rubber leg, the elastic action of the whole rubber leg can be sufficiently exhibited. At the time of assembly, the substrate and the rubber leg can be integrated by simply inserting the head into the through hole, and the engagement relationship with each case can be established by fitting the protrusion and the opening. Advantages such as reduction in the number of parts and improvement in assembly workability can be obtained.

(3) Description of Seal Structure FIG. 13 shows a seal structure according to this embodiment. In particular, the opening edges of the rear case 52 and the front case 54 are shown as enlarged views. The front case 54 is formed with a seal groove 62 as a rectangular groove. As will be described later, the seal groove 62 has a three-dimensional shape and is a closed loop groove. A packing 64 is disposed in the seal groove 62. The packing 64 is a seal member, and is made of an elastic member such as rubber. The packing 64 has the same three-dimensional shape as the three-dimensional shape of the seal groove 62 and has a closed loop shape. A first surface of the packing 64, specifically, a surface 64B that is in contact with the bottom surface of the seal groove 62 has a mountain shape. This is to improve the adhesion between the first surface 64B and the bottom surface of the seal groove 62 when the packing 64 is crushed. The surface on the pressing side of the packing 64, that is, the second surface 64A constitutes a flat surface. The pressing action by the pressing body 65 reaches such a flat surface 64A.

A pressing body 65 is formed on the rear case 52. The pressing body 65 is formed in an inner surface 52A shape, and specifically includes an offset portion rising from the inner surface 52A and two

protrusions

94 and 96 formed on the end surface of the offset portion. Such a row of ridges is for enhancing the crushing action on the packing 64. The protrusion 94 is an outer protrusion, and the protrusion 96 is an inner protrusion. In this way, multiple ridge rows are formed from the outside to the inside. In the example shown in FIG. 13, the cross sections of the

protrusions

94 and 96 have a semicircular shape, but an oval shape or other shapes may be adopted.

FIG. 14 shows the operation in the seal structure. As described above, the packing 64 is accommodated in the seal groove 62, and when the rear case 52 is joined to the front case 54, the pressing body 65 enters the seal groove 62, and in particular, the two protrusions 94. 96 push the second surface of the packing 64 deeply into the groove.

In such a state, coupled with the shape of the first surface of the packing 64, the packing 64 is strongly crushed in the seal groove 62, that is, the packing 64 is in close contact with the inner surface of the seal groove 62 and pressed. Since a close contact state is completely formed between the body and the packing 64, the sealing performance can be extremely enhanced. For example, even if there is an incomplete sealability between the outer protrusion 94 and the packing 64, the sealability can be ensured by the protrusion 96 on the inner side. The same applies to the reverse. It is desirable to provide two

protrusions

94 and 96 for the convenience of production. Each

protrusion

94 and 96 is a protrusion extending along the direction of the seal groove 62. The pressing body 65 has the same three-dimensional shape as the three-dimensional shape of the seal groove 62 and has a closed loop configuration.

15A shows the front case 54, FIG. 15B shows the packing 64 having a three-dimensional shape, and FIG. 15C shows the rear case 52.

The front case 54 has a cap holder 104 as shown in FIG. Specifically, the cap holder 104 is integrally formed as a part of the front case 54. The inside of the cap holder 104 is a deformation cavity, and a cap is fitted therein. As will be described later, a display housing portion is integrally formed in the front case 54.

In the rear case 52 shown in (C), a recess 104A having a semicircular shape corresponding to the cap holder 104 is generated. Moreover, the recessed part 100 for receiving the protrusion part of said indicator accommodating part has arisen.

The row of ridges as the pressing body 65 has a three-dimensional shape as shown in the figure, and the row of ridges includes a portion 65A in the recess 100 and a portion 65B in the recess 104A. Have.

Such portions

65A and 65B have portions that are parallel to the joining direction of the two cases. On the other hand, in the present embodiment, as described above, the pressing body 65 as the row of ridges is formed, and the surface shape of the packing 64 is operated. It is possible to increase. Incidentally, in the packing 64, the part fitted in the part 65A mentioned above is shown by 64A, and the part fitted in the part 65B mentioned above is shown by 64B. Portion 65A can be referred to as a lower rectangular portion and portion 65B can be referred to as a lower semicircular portion.

FIG. 16 shows an exploded perspective view of a personal dosimeter viewed from different directions. (A) shows the rear case 52, (B) shows the packing 64, and (C) shows the front case 54. In FIG. 16, the direction indicated by the arrow is the forward direction from the living body side. As shown in (C), a seal groove 62 is formed in a three-dimensional shape along the opening edge of the front case 54. The front case 54 includes a display housing portion 102, and a part of the front case 54 protrudes in a rectangular shape on the rear case 52 side. Further, the front case 54 includes a cylindrical cap holder 104. The seal groove 62 is formed so as to go around the upper side of each such protruding portion. Incidentally, reference numeral 106 represents a battery accommodating chamber.

In the packing 64 shown in (B), the upper rectangular portion corresponding to the display housing portion is indicated by reference numeral 64A. A portion corresponding to the cap holder 104 is indicated by an upper semicircular portion 64B. When the two

cases

52 and 54 are joined with the packing 64 fitted in the seal groove 62, the two protrusions formed on the rear case 52 side enter the seal groove 62, thereby strengthening the packing 64. Will be pressed. As a result, even if there is a portion in the packing 64 that is parallel to the joining direction of the two cases, it is possible to effectively prevent deterioration of the sealing performance there. That is, even when the sealing performance is insufficient at one ridge, it is possible to ensure the sealing performance at the other ridge.

In the above embodiment, the seal path is set so as to exceed the edge of the portion protruding from the front case to the rear case side. This avoids complication of the seal structure in the case where such a protruding portion is constituted by another piece. In addition, the number of parts is reduced. In particular, in a cap holder, it is necessary to securely seal around the cap as a detachable part, and if a crack structure is adopted for such a part, the sealing performance is likely to deteriorate. Since the seal path is set so as to go around the outside without being divided, a unique seal member can be arranged inside the cap holder, and the problem of deterioration of the sealing performance between the cases does not occur. Moreover, even if the seal path is set so as to go around the surface of such a protruding portion, the sealing performance as a whole can be maintained by the action of the two protrusions as described above.

Incidentally, a mold or the like can be used for manufacturing a packing having a three-dimensional shape. In the embodiment described above, the two cases are connected after the packing is disposed in the seal groove. In that case, it is possible to connect the two cases using only four screws. In addition, as described above, these screw threads are concealed in a part of the attachment member, and the appearance when viewed from the outside can be improved.

In the above embodiment, a structure other than the above can be adopted as the structure for pressing the seal member. For example, only one protrusion may be provided. Even with such a configuration, the seal member can be locally pressed to increase the deformation thereof, and thus the sealing performance can be improved. Moreover, you may make it provide three or more protrusions. However, if too many ridges are provided, it is equivalent to a planar pressing action, so it is desirable to provide double ridges as described above. Incidentally, it is desirable to form each corner portion with a slight roundness in a three-dimensional loop path.

The main body case, the two arms, and the pressing bar may be integrated. Even in that case, the cloth or the like can be elastically sandwiched between the front surface or the back surface of the main body case and the pressing bar.

Claims

A main body case having a right end portion and a left end portion and containing a radiation sensor;
An attachment mechanism provided in the main body case;
Including
The attachment mechanism is
A right mounting member having an upper right hook portion hooked on an upper end portion of the right end portion and a lower right hook portion hooked on a lower end portion of the right end portion;
A left mounting member having an upper left hook portion hooked on an upper end portion of the left end portion, and a lower left hook portion hooked on a lower end portion of the left end portion;
A member that connects the right mounting member and the left mounting member through the front surface side or the rear surface side of the main body case, and a pressing bar for sandwiching a cloth or the like between the front surface or the rear surface of the main body case. A clip member having
A personal dosimeter characterized by including.
The personal dosimeter according to claim 1,
The clip member is
A portion extending from the right mounting member to the pressing bar, and a right arm that biases the pressing bar toward the body case;
A left arm that extends from the left mounting member to the pressing bar, and biases the pressing bar toward the body case;
A personal dosimeter characterized by including.
The personal dosimeter according to claim 2,
The right arm extends downward from the upper part of the right mounting member,
The left arm extends downward from the upper part of the left mounting member,
The pressing bar is provided below the intermediate height on the front side of the main body,
The upper part of the front surface of the case body above the pressing bar is opened,
A personal dosimeter characterized by that.
The personal dosimeter according to claim 3,
Each of the right arm and the left arm has an S-shape when viewed from the side,
The S-shape includes a root portion, a mountain portion, a valley portion, and a warped portion that are continuous from the top to the bottom.
A personal dosimeter characterized by that.
The personal dosimeter according to claim 4,
The pressing bar is inclined with respect to the main body case,
The gap generated between the back surface of the pressing bar and the front surface of the main body case has a form in which the gap increases from above to below.
A personal dosimeter characterized by that.
The personal dosimeter according to claim 1,
The right mounting member is
A right mounting member main body having the upper right hook part, the lower right hook part, and a right front part connected to the upper right hook part and the lower right hook part on the front surface side of the main body case;
A right connecting part that connects between the rear end of the upper right hook part and the rear end of the lower right hook part on the back side of the main body case;
A left mounting member main body having the upper left hook part, the lower left hook part, and a left front part connected to the upper left hook part and the lower left hook part on the front side of the main body case;
A left connecting part that connects between the rear end of the upper left hook part and the rear end of the lower left hook part on the back side of the main body case;
A personal dosimeter characterized by including.
The personal dosimeter according to claim 6,
The main body case is composed of a front case and a rear case,
A plurality of screwing structures for fixing the rear case to the front case are provided,
The right connecting part and the left connecting part cover the plurality of screw structures;
A personal dosimeter characterized by that.
The personal dosimeter according to claim 1,
The attachment mechanism is detachably provided to the main body case.
A personal dosimeter characterized by that.
The personal dosimeter according to claim 1,
The right end and the left end have an elliptical shape extending in the vertical direction,
The right mounting member and the left mounting member have a ring-shaped configuration extending in the up-down direction,
A personal dosimeter characterized by that.
The personal dosimeter according to claim 1,
The pressing bar constitutes a handle that can be opened and closed by a fingertip,
A personal dosimeter characterized by that.