JP5244016B2 - Personal dosimeter - Google Patents

Description

  The present invention relates to a portable personal dosimeter, and more particularly, to a structure of a battery housing portion that houses a coin-type battery.

  Personal dosimeters are carried by persons engaged in work to manage personal exposure in facilities that handle radiation and radioactive substances (see Patent Documents 1 and 2). Usually, the main body is clipped in a state of being inserted into the operator's breast pocket. A personal dosimeter is typically driven by a replaceable battery. The battery usually has a coin shape and is placed in a predetermined battery housing. More specifically, the cap-shaped battery cover is removed from the personal dosimeter body, and a part of the exposed battery is picked up, and the battery is pulled out. Thereafter, a new battery is inserted into the battery housing, and finally the battery cover is attached to the personal dosimeter body again.

  If the spreading direction of the battery inserted into the battery housing portion is defined as a horizontal direction, the battery housing portion has a horizontal slit shape as a whole. In the battery housing portion, there is an insertion (extraction) opening on the front side in the battery insertion direction, and the battery housing portion has a hollow shape that extends from the insertion opening to the back side. In the coin-type battery, the upper surface and the side peripheral surface function as a positive electrode surface, and the lower surface functions as a negative electrode surface. Between batteries satisfying the same standard, the diameter and thickness are the same, but the shape of the side peripheral surface is not necessarily the same. Some have a cylindrical surface with a flat side surface, and some have a step on the side surface. In the latter battery, for example, the upper part is a large diameter part and the lower part is a small diameter part. In personal dosimeters, it is desirable to be able to use multiple types of batteries within the same standard.

  Note that in the conventional personal dosimeter, a plus terminal and a minus terminal are generally provided on the bottom surface and the ceiling surface of the battery housing portion. That is, it can be said that a general structure is such that a plus terminal is brought into contact with the upper surface of the battery from above and a minus terminal is brought into contact with the lower surface of the battery from below. That is, as a result, the battery is sandwiched between the two terminals from above and below.

Patent No. 3380175 JP-A-2005-69960

  Since personal dosimeters are worn by workers for a long time and are intended to manage the safety of workers, a structure that is resistant to shock and vibration is required. In particular, it is required that the battery is stably held in the battery housing portion and that electrical contact is reliable. However, in the personal dosimeter of the type in which the battery is sandwiched between the plus terminal and the minus terminal, it is possible to obtain an elastic holding action in the vertical direction, and no elastic holding action occurs in the horizontal direction (left and right direction). Therefore, if the gap generated between the left and right inner walls in the battery housing portion and the side peripheral surface of the battery is large, the battery may not be stably held in the horizontal direction in the battery housing portion. Even if this is not the case, it is desirable to hold the battery by a strong elastic action for stable holding of the battery. However, if a complicated structure or a thick member is placed on the upper and lower sides of the battery in the battery housing part, It is against the request for thinner dosimeters.

  An object of the present invention is to make it possible to stably hold a battery in a personal dosimeter while ensuring reliable contact with two electrode surfaces of the battery.

  The present invention includes a coin-type battery having an upper surface and a side peripheral surface forming a positive electrode surface and a lower surface forming a negative electrode surface, and accepts the battery in a portable personal dosimeter operated by electric power from the battery. A battery housing part having an insertion opening, through which the battery is inserted from the horizontal direction, and a negative electrode contact member provided on a bottom surface in the battery housing part and configured by a conductive member having elasticity A pair of positive electrode contact members that are provided along an inner wall on one side and an inner wall on the other side of the battery housing portion and are made of a conductive member having elasticity, and the negative electrode contact member includes The battery contacts the lower surface of the battery accommodated in the accommodating portion with elasticity from below, and each positive electrode contact member is connected to the battery. A form extending from a fixed end fixed to the back side of the container part to an action end located in the vicinity of the insertion opening through an intermediate part curved along a side peripheral surface of the battery stored in the battery storage part And when the battery is inserted into the insertion opening, the working ends of the pair of positive electrode contact members abut against the side peripheral surface of the battery and the pair of positive electrode contact members are pushed apart in a direction away from each other, The battery is captured between intermediate portions of the pair of positive electrode contact members, and the captured state is maintained by the elastic action of the pair of positive electrode contact members.

  According to the said structure, a battery is inserted in a battery accommodating part via an insertion opening. In the set state, the battery is elastically held by the pair of positive electrode contact members from the left and right sides, and the battery is held at the same time as the positive electrode surface of the battery is connected. At the same time, since the negative electrode contact member is in contact with the negative electrode surface on the lower side of the battery, conduction with respect to the negative electrode is thereby achieved. Since the pair of positive electrode contact members elastically hold the battery from both sides, the battery can be prevented from moving or vibrating in the horizontal direction (front-rear direction, left-right direction) when the personal dosimeter is used. At the same time, the negative electrode contact member is elastically brought into contact with the negative electrode surface from the lower side of the battery, so that the negative electrode can be reliably connected, and also prevents vertical movement or vibration. An effect can be obtained. The elastic action of the negative electrode contact member may be smaller than the elastic action of the positive electrode contact member. The elastic force of the pair of positive electrode contact members is large so as not to cause the battery to jump out or drop off, or to cause poor positive electrode contact. It is desirable that the battery can be inserted and removed. In the above configuration, the battery can be held and the positive electrode can be connected by the same member, so that the number of parts can be reduced and the personal dosimeter can be miniaturized. Further, since a combination of contact from left and right and contact from below, that is, T-shaped contact, vibration, rattling or poor contact can be prevented or reduced in both the horizontal direction and the vertical direction.

  Preferably, a contact piece protruding from an inner surface of the intermediate portion is provided at an intermediate portion of each positive electrode contact member. If the contact piece comes into contact with the battery side peripheral surface, the electrical connection can be ensured.

  Desirably, a slit extending along the extending direction of the intermediate portion is provided in an intermediate portion of each positive electrode contact member, and each contact piece is a small piece that is extended and bent from an edge of each slit. is there. The slit also functions as a structure for adjusting the elastic force, and the contact piece can be easily formed by the slit.

  Desirably, the inner wall surface on one side and the inner wall surface on the other side of the battery housing portion have recesses that partially receive the pair of positive electrode contact members when the pair of positive electrode contact members move open. . These indentations desirably accept the working end of the positive electrode contact member (when it opens and moves).

  Preferably, the inner wall surface on one side and the inner wall surface on the other side of the battery housing portion are portions that contact the outer surface of the intermediate portion of the pair of positive electrode contact members, and follow the curved form of the intermediate portion. It has a curved portion that is curved. According to this configuration, the outer surface of the intermediate portion is partially held by the curved portion, and the positive electrode contact member can be prevented from moving outside more than necessary.

  According to the present invention, in a personal dosimeter, the battery can be stably held while achieving reliable contact with the two electrode surfaces of the battery.

It is a front view which shows suitable embodiment of the personal dosimeter which concerns on this invention. It is a side view of the personal dosimeter shown in FIG. It is a rear view which shows the state which removed the cover. It is a side view which shows the state which removed the cover. It is a perspective view which shows the state which removed the cover. It is a perspective view which shows the state by which the battery was pulled out. It is a rear view which shows the state in which the battery is not set yet. It is a side view which shows the state in which the battery is not set yet. It is sectional drawing of a battery accommodating part. It is sectional drawing of the battery accommodating part in the state in which the battery is not set. It is a perspective view of a contact member.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.

  FIG. 1 shows a preferred embodiment of a personal dosimeter according to the present invention. The personal dosimeter 10 is a measuring device for personal exposure management carried by a person engaged in work in a facility that handles radiation and radioactive materials. The personal dosimeter 10 is, for example, mounted in a worker's breast pocket or the like and carried by the worker.

  In FIG. 1, the personal dosimeter 10 has a configuration extending in the X direction as a whole, and has a thin thickness in the Z direction orthogonal to the X direction and the Y direction. The personal dosimeter 10 has a main body 12 and a cover 14. The cover 14 is a member for closing an accommodating portion described later. A semiconductor sensor 22 as a radiation measuring instrument (not shown) is provided in the main body 12. In addition, an electronic circuit board for processing a signal from the sensor is accommodated therein. A display 16, a plurality of light emitting elements 18, buttons 20, and the like are provided on the front surface of the main body 12. The main body 12 is configured with an accommodating portion described later, and a coin-shaped battery is accommodated in the accommodating portion. Incidentally, when the direction in which the battery spreads is defined as the horizontal direction, the X direction is the first horizontal direction and the Y direction is the second horizontal direction. The Z direction is the vertical direction. As will be described later, the battery is inserted into the housing portion from the X direction.

  FIG. 2 is a side view of the personal dosimeter 10 shown in FIG. The personal dosimeter 10 has the main body 12 and the cover 14 as described above, and a clip 24 is provided on the back side of the main body 12. Using the clip 24, a pocket cloth or the like is sandwiched between the clip 24 and the back surface of the main body 12.

  3 and 4 show a state where the cover is removed. 3 is a rear view, and FIG. 4 is a side view. 3 and 4, the main body 12 is provided with a housing portion 26, and the housing portion 26 functions as a battery holder. FIGS. 3 and 4 show a state where a coin-shaped battery 28 is inserted and set in the accommodating portion 26. Incidentally, the AA cross section in FIG. 4 is FIG. 9 described later.

  5 and 6 are perspective views of the personal dosimeter, particularly the personal dosimeter with the cover removed. In FIG. 5, the battery 28 is set in the accommodating part 26, and in the state shown in FIG. 6, the battery 28 is pulled out from the accommodating part 26 to the near side. The battery 28 has an upper surface 28A, a side peripheral surface 28B, and a bottom surface 28C. The upper surface 28A and the side peripheral surface 28B are made of the same metal member, and they form a positive electrode surface. The bottom surface 28C forms a negative electrode surface, which is insulated from the positive electrode surface.

7 and 8 show a state where the battery is removed from the main body 12. FIG. FIG. 7 is a rear view, and FIG. 8 is a side view. 7 and 8, the accommodating portion 26 has a slit 30 as a battery insertion port. A holder 34 for holding the battery is provided, and a metal fitting 36 is wound around the root of the holder 34. An intermediate portion of the holder 34 is cut off, that is, a notch 32 is formed. By having such a notch 32, it is possible to insert the thumb and forefinger into that portion to pick up the battery or insert the battery. The structures shown in FIGS. 7 and 8 are known per se. In addition, the BB cross section shown in FIG. 8 is FIG. 10 demonstrated later.

  FIG. 9 shows a horizontal cross section of the accommodating portion 26. Here, the battery 28 is shown in a simplified manner. The accommodating part 26 has a holder as described above, and the holder has side walls 40 and 42. The side wall 40 is the left side wall when viewed from the direction in which the battery 28 is inserted, and the side wall 42 is the right side wall. In addition, the holder has a bottom wall and a ceiling wall. A pair of contact members 44 and 46 are provided inside the accommodating portion 26. Specifically, the contact members 44 and 46 are positive electrode contact members, the contact member 44 is located on the left side when viewed from the battery 28, and the contact member 46 is located on the right side when viewed from the battery 28. Yes. As will be described later with reference to FIG. 10, each contact member 44, 46 has a form extending from a fixed end to an action end through an intermediate portion, and is constituted by an elastic member made of metal. The pair of contact members 44 and 46 exerts an effect of holding the battery 28 firmly from the left and right sides and maintaining the state. That is, in a state where the battery 28 is held by the pair of contact members 44 and 46, the horizontal movement of the battery 28 is restricted, that is, the battery 28 basically does not move in the left-right direction and the front-rear direction. Reference numeral 38 denotes a stopper for determining the position of the battery 28 when it abuts.

  FIG. 10 shows a cross section of the accommodating portion 26 in a state where the battery is not accommodated. The accommodating part 26 has a holder as described above, and the holder has side walls 40 and 42. The contact members 44 and 46 have fixed ends 44A and 46A, intermediate portions 44B and 46B, and working ends 44C and 46C. The fixed ends 44A and 46A are portions for fixing the contact members 44 and 46 to the main body, and the contact members 44 and 46 can move from the fixed ends 44A and 46A, respectively. The contact members 44 and 46 are positioned in close contact with the inner surfaces of the side walls 40 and 42 by the elastic action. However, both may not contact in a natural state.

  The fixed ends 44A and 46A have a bent shape, from which intermediate portions 44B and 46B extend, and they have a curved shape. The degree of curvature corresponds to the degree of curvature of the side peripheral surface of the battery. Through such intermediate portions 44B and 46B, when the battery is set, the working ends 44C and 46C are located on the outlet side from the center of the battery, and the working ends 44C and 46C are narrowed inward. Thus, the battery is securely held between the two contact members 44 and 46. Each working end 44C, 46C has a form that opens outward at its end, and when the battery is inserted by such a form, each working end 44C, 46C smoothly abuts on the side peripheral surface of the battery. It is possible. When the battery is further pushed into the back side, the working ends 44C and 46C slide on the side peripheral surfaces and move in a direction away from each other, that is, open, and spread by an amount corresponding to the battery diameter. This time, an action of pulling it inward occurs, and the battery is firmly held between the two contact members 44 and 46.

  The side walls 40 and 42 have inner surfaces that contact the outer surfaces of the contact members 44 and 46. That is, the inner surface is a vertical inner wall surface. Their inner surfaces have a form that is in close contact with the curved portions (outer surfaces) of the intermediate portions 44B and 46B, that is, there are portions having the same curved shape as the curved shapes of the intermediate portions 44B and 46B. Indentations 40A and 42A are formed on the outlet side of such a curved portion. These recesses 40A and 42A are for receiving the above-described working ends 44C and 46C when they are opened outward. That is, the working ends 44C and 46C can be configured to be sufficiently spread outward by the depressions 40A and 42A.

  A contact member 50 is installed on the bottom surface of the housing portion 26. The contact member 50 is made of an elastic metal member, which constitutes a negative electrode contact member. The contact member 50 has three elastic pieces 52, and these elastic pieces 52 rise while being inclined obliquely. The leading end portion of each elastic piece 52 comes into contact with the lower surface of the battery, that is, the negative electrode surface, thereby conducting the negative electrode. Although the elastic action of each elastic piece 52 is quite weak, it is possible to suppress or mitigate rattling and vibration of the battery in the vertical direction by the action of pushing the battery elastically from below. In other words, according to the housing portion 26 of the present embodiment, vibrations and rattling in the horizontal direction (front-rear direction and left-right direction) are suppressed by the pair of contact members 44 and 46, and at the same time, rattling and vibrations in the vertical direction are prevented. It is suppressed by the elastic action of the contact member 50. At this time, the upper surface of the battery may or may not contact the ceiling surface. Since the battery can be stably held in the accommodating portion 26, there is an advantage that a stable power supply state can be secured without causing a problem such as poor contact.

FIG. 11 shows the contact member 44 as a perspective view. Since the other contact member has the same (symmetric) form as that shown in FIG. 11, a specific configuration of the contact member 44 will be described as a representative. As described above, the contact member 44 has the fixed end 44A, the intermediate portion 44B, and the working end 44C. The intermediate portion 44B that is extended from the fixed end 44A while being bent has a shape curved along the curvature of the side peripheral surface of the battery, and a slit 56 is formed at an intermediate position in the vertical direction. The slit 56 has a curved shape while extending along the extending direction of the intermediate portion 44 </ b> B, and the projecting piece 60 extends from the edge 58 (working end side) edge 58 of the slit 56. The projecting piece 60 is a contact piece that protrudes from the inner surface 54 toward the battery side (inner side) and extends toward the fixed end 44 </ b> A. Since the contact with the peripheral surface is ensured, there is an advantage that the electrical connection and the battery holding can be stably performed.

  As described above, according to the personal dosimeter according to the present embodiment, in the housing portion that houses the coin-shaped battery, the battery is firmly held from the horizontal direction by the pair of contact members, and the negative electrode from the lower side. Since the battery is pushed up from the lower side by the member, there is an advantage that the holding and conduction can be stabilized in both the horizontal direction and the vertical direction. Further, since the pair of contact members can be held together with the positive electrode conduction to the battery, there is an advantage that it is not necessary to prepare another member for holding or for conduction. That is, it is possible to reduce the number of parts and contribute to making the personal dosimeter thinner. Further, in the above-described embodiment, the left and right side walls of the housing portion are formed with curved portions and depressions, which can support the contact member from the outside and secure the necessary movable range. Even when used, there is an advantage that the deterioration can be reduced. This in turn improves the reliability of power supply.

  10 personal dosimeters, 12 body, 14 cover, 26 housing, 28 battery, 40 side wall, 42 side wall, 44, 46 contact member, 50 contact member.

Claims (3)

In a portable personal dosimeter equipped with a coin-type battery having an upper surface and a side peripheral surface forming a positive electrode surface and a lower surface forming a negative electrode surface, and operated by electric power from the battery,
A battery housing portion having an insertion opening for receiving the battery, and the battery is inserted from the horizontal direction through the insertion opening;
A negative electrode contact member which is provided on the bottom surface in the battery housing portion and is made of a conductive member having elasticity;
A pair of positive electrode contact members that are provided along the inner wall on one side and the inner wall on the other side of the battery housing portion and configured by a conductive member having elasticity;
Including
The negative electrode contact member contacts the lower surface of the battery accommodated in the accommodating portion with an elastic action from below,
Each positive electrode contact member passes from the fixed end fixed to the back side of the battery housing part through the intermediate part curved along the side peripheral surface of the battery housed in the battery housing part, and It has a form extended to the working end located in the vicinity,
In each of the positive electrode contact members, an intermediate portion is provided with a slit extending while curving along the extension direction of the intermediate portion, and from the edge of the slit on the working end side than the inner surface of the intermediate portion. A contact piece extending toward the fixed end while protruding inward is provided,
When the battery is inserted into the insertion opening, the working ends of the pair of positive electrode contact members abut against the side peripheral surface of the battery, and the pair of positive electrode contact members are pushed away from each other. The battery is captured between the middle portions of the positive electrode contact members, and the captured state is maintained by the elastic action of the pair of positive electrode contact members, and the pair of contact pieces in the pair of positive electrode contact members in the captured state. Contacts the side peripheral surface of the battery,
A personal dosimeter characterized by that. In personal dosimeter according to claim 1,
The inner wall surface on one side and the inner wall surface on the other side of the battery housing portion have depressions that partially receive the pair of positive electrode contact members when the pair of positive electrode contact members move open. Characteristic personal dosimeter. The personal dosimeter according to claim 1 or 2 ,
The inner wall surface on one side and the inner wall surface on the other side of the battery housing portion are portions that contact the outer surface of the intermediate portion of the pair of positive electrode contact members, and are curved along the curved form of the intermediate portion. A personal dosimeter characterized by having a curved portion.

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