JP2017139144A - Battery holding structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery holding structure which can be simplified and is resistant to drop impact.SOLUTION: The battery holding structure is provided that comprises: a battery housing section (21a) in which a battery (6) is housed with a battery electrode directed toward a first direction; and a metal plate (44) which is in contact with the battery electrode and is electrically conducted to the battery. The battery holding structure is configured in such a way that: the metal plate is turnable in a plane orthogonal to the first direction; a dimension (L1) from a rotation axis to an outer edge most distant from the rotation axis is different from a dimension (L2) to the outer edge closest to the rotation axis; and when the metal plate turns a certain amount from an initial position where it does not turn, the battery is locked to fix the battery in the battery housing.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a battery holding structure for holding a battery stored in a battery storage portion of an electronic device.

  Conventionally, when a battery (for example, a cylindrical battery) is stored in a battery storage part of an electronic device and the battery cover is closed, a battery electrode on the opening side of the battery storage part and a battery contact piece arranged on the battery cover are separated. A battery holding structure that comes into contact is known (see, for example, Patent Document 1). In the battery holding structure described in Patent Document 1, a battery lid provided with a battery contact piece is supported so as to be pivotable about a hinge portion, and a recessed portion locking portion provided on an outer surface in the vicinity of the opening of the battery storage portion Is engaged by engaging the L-shaped engaging portion of the battery lid. When the battery is loaded in the battery housing and the battery lid is closed and locked, the battery contact piece contacts the battery electrode surface.

JP 2004-192835 A

  However, in the battery holding structure described in Patent Document 1, the battery lid is supported so as to be rotatable about the hinge portion. Therefore, in order to close and lock the battery lid, it is necessary to provide a recess latching portion on the outer surface of the battery housing portion, an L-shaped latching portion on the battery lid, and a hinge portion on the battery lid. there were. For this reason, there existed a problem that a structure was complicated and the latching | locking part was weak to a drop impact.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a battery holding structure that can simplify the structure and is resistant to a drop impact.

  A battery holding structure according to the present invention includes a battery holding portion that holds a battery with the battery electrode facing in the first direction, and a battery holding plate that is in contact with the battery electrode and is electrically connected to the battery. The metal plate is rotatable in a plane orthogonal to the first direction, and the dimension to the outer edge farthest from the rotation axis is different from the dimension to the nearest outer edge. When the battery is rotated by a certain amount from the initial position, the battery in the battery storage unit is locked.

  According to the present invention, the structure can be simplified, and a battery holding structure that is resistant to dropping impact can be provided.

It is an external appearance perspective view of the dosimeter to which the battery holding structure concerning this Embodiment is applied. It is a side view of the dosimeter concerning this Embodiment. It is a perspective view which shows the internal structure of the housing | casing of the dosimeter which concerns on this Embodiment. It is a disassembled perspective view of the holding unit of the battery holding structure according to the present embodiment. It is the front view and back view of the holding unit of the battery holding structure which concerns on this Embodiment. It is explanatory drawing of the holding | maintenance unit made into the lock release state / lock state with respect to the housing | casing of the dosimeter which concerns on this Embodiment. It is an expansion perspective view of the holding | maintenance unit locked to the housing | casing of the dosimeter which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. Below, the case where the battery holding structure which concerns on this invention is applied to the dosimeter which the worker who works in the radiation control area in radiation handling facilities, such as a nuclear power plant, carries is demonstrated. However, the application target of the battery holding structure according to the present invention is not limited to a dosimeter and can be changed as appropriate. For example, the present invention can be applied to an arbitrary electronic device such as a flashlight or a gas meter with a battery built in the housing.

  FIG. 1 is an external perspective view of a dosimeter to which the battery holding structure according to the present embodiment is applied. In the following description, unless otherwise specified, “up”, “down”, “left”, “right”, “front”, “rear” are based on the view from the direction of arrow A shown in FIG. It shall be used as

  As shown in FIG. 1, the dosimeter 1 includes a housing 2 having a generally flat rectangular parallelepiped shape. The casing 2 has a configuration in which a part of the upper side thereof has a larger thickness dimension than a part of the lower side in a side view (see FIG. 2). A display area 3 is provided on the upper surface of the housing 2. The display area 3 is provided along an inclined surface that descends toward the front. The display area 3 is configured so that a display screen corresponding to the operation state of the dosimeter 1 can be displayed to the operator.

  A holding unit 4, an emergency button 5, and caps 51 and 52 are provided on the right side surface 2a of the housing 2, and various operation buttons (not shown) are provided on the left side surface of the housing 2 which is hidden in FIGS. (Confirmation button, selection button) are provided. The holding unit 4 constitutes a main part of the battery holding structure according to the present invention. The holding unit 4 is attached to a battery access opening (hereinafter simply referred to as “opening”) 21 formed on the outer wall of the housing 2 and constitutes a part of the housing 2. The holding unit 4 is mounted in the opening 21 of the housing 2 and is stored in the opening 21 (more specifically, the battery storage portion 21a provided in the opening 21) (see FIG. 6). 2B). The detailed configuration of the holding unit 4 will be described later.

  When the emergency button 5 is pressed down, an emergency report is transmitted from the dosimeter 1 to an external device (for example, a monitoring device). The caps 51 and 52 are covers that cover various connector portions. In addition, among various operation buttons provided on the left side surface of the housing 2, for example, the dosimeter 1 is activated by pressing and holding the confirm button, and the selection button is displayed by pressing down after the dosimeter 1 is activated. It is a button that can be selected to change the contents.

  FIG. 2 is a side view of the dosimeter 1 according to the present embodiment. 2A shows a state in which the holding unit 4 is attached, and FIG. 2B shows a state in which the holding unit 4 is removed. As shown in FIG. 2A, the holding unit 4 includes a cover body 41 that has a generally elliptical shape when viewed from the front, and a disk-shaped operation member 42 that is disposed at substantially the center of the cover body 41. As will be described in detail later, a part of the outer edge portion of the lid body 41 is provided with a protruding portion 41b that slightly protrudes outward (upper side shown in FIG. 2A).

  As shown in FIG. 2B, an opening 21 is formed on the upper side of the cap 51 of the housing 2. The opening 21 has a long hole shape in front view. In particular, the opening 21 has a shape corresponding to a protrusion 415 (see FIG. 4B) of the lid 41 described later. Further, the opening 21 is configured to have a size capable of accommodating the protruding portion 415 of the lid body 41.

  A battery storage portion 21a is provided on the inner side of the opening 21 (the back side in FIG. 2). A pair of batteries 6 (61, 62) is stored in the battery storage portion 21a. In the dosimeter 1 according to the present embodiment, the pair of batteries 61 and 62 has the battery electrode convex portions 61a and 62a on the positive electrode (+ electrode) side in the right direction (front side in FIG. 2B: first direction). ) Is stored in the battery storage portion 21a. For example, an AA battery is stored as the battery 6 in the battery storage unit 21a.

  In addition, a recess 22 that slightly extends in the vertical direction is formed above the opening 21. The concave portion 22 is used to position the holding unit 4 (more specifically, the lid body 41) when the holding unit 4 is attached to the housing 2. The holding unit 4 is positioned at a predetermined position by performing the mounting operation with the protruding portion 41b of the lid body 41 positioned in the recess 22.

  FIG. 3 is a perspective view showing the internal structure of the housing 2 of the dosimeter 1 according to the present embodiment. In FIG. 3, a part of the front side of the housing 2 is shown, and a part of the rear side is omitted. As shown in FIG. 3, a bulging portion 23 bulging slightly outward is provided around the opening 21 in the right side surface 2 a of the housing 2. An engagement wall 24 is formed on the inner wall surface of the bulging portion 23. The engaging wall 24 has a flat portion and is disposed around the entire periphery of the opening 21. The engagement wall 24 is configured to be able to engage with a part of a metal plate 44 of the holding unit 4 described later.

  By the way, in an electronic device that stores a battery in a battery storage section in a casing, a battery lid having a battery section is attached to the casing with a screw or the like, thereby fixing the battery in the battery storage section and the battery electrode. There are many things that conduct. However, in an electronic device having such a battery fixing structure, the battery lid may be damaged or deformed by an impact when dropped. When the battery lid is damaged or the like, the battery piece cannot be properly brought into contact with the battery electrode, and it may be difficult to conduct with the battery electrode.

  On the other hand, it is conceivable to increase the thickness dimension of the battery lid in order to improve the strength of the battery lid. However, in this case, it is assumed that the battery lid protrudes from the housing, and it is difficult to downsize the entire device. Moreover, as a result of an impact being directly applied to the battery lid protruding from the casing when dropped, the structure around the battery lid is liable to be damaged.

  The present inventors have paid attention to the fact that the structure in which the battery in the battery housing portion is fixed with the battery lid causes such a situation. And, giving rigidity to the metal plate (conduction member) that conducts to the battery electrode, and fixing the battery in the battery housing part with this metal plate itself contributes to the simplification of the battery fixing structure and the improvement of strength against dropping impact. As a result, the present invention has been conceived.

  In other words, the present invention includes a battery housing portion in which a battery is housed and a metal plate that is electrically connected to the battery, and the metal plate is configured to be rotatable and is provided with a difference in radial dimension from the rotating shaft. The main point is to set a locked state in which the battery in the battery housing is fixed when the battery is rotated by a certain amount from the initial position.

  According to the present invention, since the metal plate that is electrically connected to the battery is rotated to realize the lock mechanism, the member for fixing the battery can be omitted, so that the structure can be simplified. Further, since the lock mechanism is realized using the metal plate, the strength against the drop impact can be improved as compared with the case where the battery fixing structure is made of a resin material separately from the metal member that is electrically connected to the battery.

  Here, the configuration of the holding unit 4 according to the present embodiment will be described with reference to FIG. FIG. 4 is an exploded perspective view of the holding unit 4 of the battery holding structure according to the present embodiment. In FIG. 4A, the holding unit 4 is shown from the front surface side (outer surface side), and in FIG. 4B, the holding unit 4 is shown from the back surface side (inner surface side).

  As shown in FIG. 4, for example, the holding unit 4 includes the lid body 41 and the operation member 42 described above, an O-ring 43, a metal plate 44, a washer 45, and a fixing screw 46. In addition, about the member which comprises the holding | maintenance unit 4, it is not limited to this, It can change suitably. For example, the O-ring 43 and the washer 45 can be omitted by changing the structure of other members.

  The lid body 41 has, for example, a main body portion 41a that is molded from a resin material. As shown in FIG. 4A, a through hole 411 is formed near the center of the surface of the main body 41a. The through hole 411 is formed to be slightly larger than the outer peripheral surface of a leg portion 422 of the operation member 42 to be described later, and has a dimension that allows the leg portion 422 to pass therethrough. A recess 412 is provided around the through hole 411. The recess 412 is configured to have a size that can accommodate the O-ring 43. A recess 413 is provided around the recess 412. The concave portion 413 is configured to have a size capable of accommodating a part of the head portion 421 of the operation member 42 described later. The concave portion 412 described above is formed at a position lowered from the surface of the concave portion 413. Further, a protruding portion 41b protruding sideward is provided on a part of the outer peripheral edge (outer edge) of the main body portion 41a (see FIG. 5).

  On the other hand, as shown to FIG. 4B, the plane part 414 is provided in the center of the back surface of the main-body part 41a. The flat portion 414 is provided around the through hole 411. On the outer side of the flat part 414, a protruding part 415 that protrudes to the back side is provided. The protruding portion 415 is formed in a ring shape along the outer peripheral shape of the lid body 41. Note that, as will be described later in detail, the protruding portion 415 is configured to have a size that can be inserted into the opening 21 of the housing 2. For example, the protrusion 415 is formed by two-color molding with the main body 41a.

  A plurality of (six in this embodiment) pins 416 (416a, 416b) slightly projecting toward the metal plate 44 (inside the housing 2) are provided at predetermined positions on the back surface (attachment surface) of the lid 41. Is provided. These pins 416 are arranged at predetermined positions on the back surface of the main body portion 41a, the flat surface portion 414, and the protruding portion 415. These pins 416 have a length shorter than the height dimension of the convex portions 61 a and 62 a of the battery electrodes on the positive electrode side of the batteries 61 and 62. Further, these pins 416 are arranged at positions where they do not interfere with the convex portions 61a and 62a of the batteries 61 and 62 in a state where the holding unit 4 is mounted on the housing 2 (see FIG. 5).

  These pins 416 serve to prevent erroneous loading of the batteries 6 (61, 62) housed in the housing 2 (loading with the battery electrodes facing in the reverse direction). For example, when the battery 6 is accommodated with the battery electrode on the negative electrode side facing the right side of the housing 2, these pins 416 can be brought into contact with the battery electrode on the negative electrode side of the battery 6. Thereby, erroneous loading of the battery 6 with respect to the battery accommodating part 21a can be prevented with a simple structure.

  Of these pins 416, the pin 416 a provided on the back surface of the flat portion 414 and the main body portion 41 a has a function as a guide pin for guiding the rotation of the metal plate 44 (see FIG. 5). Further, the pins 416a and the pins 416b provided on the projecting portions 415 have a function as regulating pins that regulate the rotation of the metal plate 44 by a certain amount or more (see FIG. 5B).

  The operation member 42 is disposed on the outer side (surface side) of the lid body 41. The operation member 42 has a head portion 421 and a leg portion 422. The head portion 421 has a generally disk shape. On the surface of the head portion 421, a groove portion 421a for receiving a part of a coin or the like is formed. The groove portion 421a receives a turning operation on the operation member 42 using a coin or the like by an operator.

  The leg portion 422 is provided so as to extend from the center of the back surface of the head portion 421. The leg portion 422 has a generally cylindrical shape and is configured to have a dimension capable of penetrating the through hole 411 of the lid body 41. The leg portion 422 constitutes the rotation shaft of the operation member 42. A polygonal portion 422 a is provided at the tip of the leg portion 422. In the present embodiment, a hexagonal portion is provided as the polygonal portion 422a. Further, a screw hole 422b is formed at the tip of the leg portion 422 along the extending direction of the leg portion 422.

  The O-ring 43 is disposed between the outer surface (front surface) of the lid body 41 and the operation member 42 and surrounds the leg portion 422 of the operation member 42. For example, the O-ring 43 is made of an elastic material and has a size that can be accommodated in the recess 412 of the lid 41. The O-ring 43 closes the through hole 411 together with the leg portion 422 by inserting the leg portion 422 of the operation member 42 in the recessed portion 412, so that water or foreign matter from the through hole 411 is mixed. Play a role to prevent.

  The metal plate 44 is disposed on the inner side (attachment surface side) of the lid body 41. The metal plate 44 is made of a conductive metal material and has a flat plate shape. In a state where the holding unit 4 is mounted on the housing 2, the metal plate 44 comes into contact with the convex portions 61 a and 62 a of the battery electrodes on the positive electrode side of the batteries 61 and 62 housed in the battery housing portion 21 a and becomes conductive. Configure the electrode. Further, in a state where the holding unit 4 is mounted on the housing 2, the metal plate 44 is configured to be rotatable in a plane orthogonal to the extending direction of the battery 6 (direction in which the battery electrode faces).

  A pair of engaging portions 44a and 44b are formed at predetermined positions on the outer edge portion of the metal plate 44 (see FIG. 5A). The engaging portion 44 a is configured by a part of an inclined surface provided on the outer edge portion of the metal plate 44. The engaging portion 44 b is configured by a concave portion provided on the outer edge portion of the metal plate 44. These engaging portions 44 a and 44 b engage with pins 416 b provided on the lid body 41. The engagement of these pins 416b with the engaging portions 44a and 44b restricts the rotation of the metal plate 44 beyond a certain position.

  An opening 441 having a polygonal shape is formed near the center of the metal plate 44. In the present embodiment, a hexagonal opening 441 is formed. The opening 441 is configured to fit into a polygonal portion 422 a provided on the leg portion 422 of the operation member 42. The metal plate 44 is configured to be rotatable integrally with the operation member 42 by fitting the polygonal portion 422a into the opening 441.

  In the metal plate 44, a plurality of (four in the present embodiment) guide grooves 442 are formed around the opening 441. These guide grooves 442 are formed so as to draw an arc with reference to the center of the rotation axis of the metal plate 44 (the center of the opening 441). Each guide groove 442 is formed at a position for receiving a pin 416 a provided on the lid 41. The rotation of the metal plate 44 can be guided by changing the position of the pin 416a accommodated in the guide groove 442 as the metal plate 44 rotates.

  Here, the shape of the metal plate 44 will be described with reference to FIG. FIG. 5 is a front view and a rear view of the holding unit 4 of the battery holding structure according to the present embodiment. FIG. 5A shows a state (initial state) in which the metal plate 44 is disposed at an initial position where it does not rotate. FIG. 5B shows a state where the metal plate 44 is rotated by a certain amount from the initial position (rotation state).

  As shown in FIG. 5, the metal plate 44 has an outer shape whose radial dimension is different from the center (center of the opening 441) c of the rotation axis. In other words, the metal plate 44 has an outer shape in which the dimension from the center c of the rotation axis to the outermost edge is different from the dimension to the nearest outer edge. For example, the metal plate 44 includes a long diameter portion 44c having the longest radius from the center c of the rotating shaft and a short diameter portion 44d having the shortest radius from the center c of the rotating shaft. The long diameter portion 44c has a length that is accommodated inside the protrusion 415 of the lid in the initial state, while a part thereof is more radial than the protrusion 415 of the lid 41 in the rotating state. It has a length that protrudes outward (see FIG. 5B).

  Returning to FIG. 4, the description of the constituent members of the holding unit 4 will be continued. The washer 45 is disposed inside the metal plate 44. The washer 45 is formed of a thin metal plate and has an annular shape. The outer dimension of the washer 45 is configured to be larger than the opening 441 of the metal plate 44. Further, the opening 451 inside the washer 45 is configured to have a dimension through which a leg 462 of a fixing screw 46 described later can pass.

  The fixing screw 46 is disposed inside the lid body 41. The fixing screw 46 has a head portion 461 and a leg portion 462. The head portion 461 is configured to have a size larger than that of the opening 451 of the washer 45. The leg portion 462 is configured to have a size capable of penetrating the opening 451 of the washer 45 and is configured to be inserted into the screw hole 422 b of the operation member 42. The fixing screw 46 serves to integrate the holding unit 4 by being fixed to the leg portion 422 of the operation member 42.

  With such a configuration, in the holding unit 4, the metal plate 44 is disposed on the attachment surface side (back surface side) of the lid body 41, and the through-hole 411 and the opening 441 are disposed with the O-ring 43 interposed. The leg portion 422 of the operation member 42 is penetrated. At this time, the metal plate 44 is overlaid on the mounting surface of the lid body 41 so that the pin 416a passes through the guide groove 442. Further, the operation member 42 is penetrated so that the polygonal portion 422 b of the leg portion 422 fits with the opening 441 of the metal plate 44. Then, with the washer 45 interposed, the fixing screw 46 is inserted into the screw hole 422b of the operation member 42 and fixed. Thereby, the holding | maintenance unit 4 which concerns on this Embodiment is assembled.

  In the assembled state, the metal plate 44 is configured to be rotatable within a certain range in accordance with the rotation of the operation member 42. In the holding unit 4 according to the present embodiment, the unlocked state and the locked state of the holding unit 4 with respect to the housing 2 are controlled using the arrangement of the metal plate 44 in the initial state and the rotating state. More specifically, while in the initial state, the unlocked state is detachable from the opening 21 of the housing 2, and the locked state is fixed to the opening 21 of the housing 2 in the rotating state. To do.

  In the initial state, as shown in FIG. 5A, the metal plate 44 is hidden behind the lid 41 in the front view. More specifically, the metal plate 44 is in a state of being disposed in a region inside the protruding portion 415 of the lid body 41. In this case, the pins 416 b provided on the lid body 41 are engaged with the engaging portions 44 a and 44 b of the metal plate 44. Further, the pin 416a provided on the lid 41 is disposed at one end of the guide groove 442 (the tip in the clockwise direction when the holding unit 4 is viewed from the back side). For this reason, the metal plate 44 is restricted from rotating counterclockwise from this position.

  On the other hand, in the rotating state, as shown in FIG. 5B, a part of the metal plate 44 (for example, the long diameter portion 44 c) protrudes (exposes) from the outer edge portion of the lid body 41 in a front view. Yes. As will be described in detail later, the portions P1 and P2 protruding from the outer edge portion of the lid body 41 come into contact with the engagement wall 24 of the housing 2 and play a role of fixing the holding unit 4 in the housing 2. Further, in the rotating state, the pin 416a provided on the lid body 41 is disposed at the other end of the guide groove 442 (the tip in the counterclockwise direction when the holding unit 4 is viewed from the back side). . For this reason, the metal plate 44 is restricted from rotating clockwise from this position.

  Further, in both the initial state and the rotating state, the pins 416a and 416b provided on the lid body 41 are arranged at positions that do not interfere with the convex portions 61a and 62a of the battery electrodes on the positive side of both the batteries 61 and 62. Has been. For this reason, even if the battery 6 has the battery electrode projections 61a and 62a on the positive electrode side, it does not come into contact with the pins 416a and 416b. On the other hand, when the battery 6 is erroneously loaded, the pin 416a contacts the flat portion of the battery electrode on the negative electrode side. In the holding unit 4 according to the present embodiment, erroneous loading of the battery 6 can be prevented by the presence or absence of such contact with the battery electrode of the battery 6.

  Next, the holding unit 4 that is unlocked or locked with respect to the housing 2 of the dosimeter 1 according to the present embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is an explanatory diagram of the holding unit 4 that is unlocked or locked with respect to the housing 2 of the dosimeter 1 according to the present embodiment. FIG. 7 is an enlarged perspective view of the holding unit 4 that is locked to the housing 2 of the dosimeter 1 according to the present embodiment. 6 and 7, the periphery of the opening 21 of the housing 2 is shown from the inside of the housing 2.

  As shown in FIG. 6A, the attaching operation of the holding unit 4 to the housing 2 is performed in a state (initial state) in which the metal plate 44 is disposed at the initial position (see FIG. 5A). In the holding unit 4, the protrusion 415 of the lid 41 is accommodated in the opening 21 of the housing 2. In the initial state, the metal plate 44 is disposed in the region inside the protrusion 415 as described above. For this reason, the metal plate 44 does not interfere with a part of the housing 2 when the protruding portion 415 is accommodated in the opening 21. And if the whole protrusion part 415 is inserted in the opening part 21, the metal plate 44 will be in the state arrange | positioned in the position inside the engaging wall 24 (refer FIG. 7).

  The attaching operation of the holding unit 4 is performed after the protruding portion 41b of the lid 41 is positioned in the concave portion 22 (see FIG. 2) of the housing 2. By positioning the protruding portion 41b in the concave portion 22 in this manner, the attaching operation can be performed in a state where the holding unit 4 is positioned with respect to the opening portion 21. Thereby, the work efficiency at the time of attaching the holding | maintenance unit 4 can be improved.

  Then, by shifting the holding unit 4 from the state shown in FIG. 6A to the rotating state, the holding unit 4 is brought into the locked state (see FIG. 6B). That is, the holding unit 4 shifts from the initial state to the rotating state by rotating the groove 421a of the operation member 42 counterclockwise with a coin or the like. By shifting to the rotating state, the portions P <b> 1 and P <b> 2 including the long diameter portion 44 c in the metal plate 44 protrude outside the protruding portion 415. For this reason, the metal plate 44 is engaged with the engagement wall 24 of the housing 2. This prevents the holding unit 4 from falling off the housing 2. At this time, the metal plate 44 comes into contact with the convex portions 61a and 62a on the positive electrode side of the battery electrode on the inner surface thereof, and is in a state where the battery 6 is fixed in the battery storage portion 21a (locked state).

  As described above, in the battery holding structure according to the present embodiment, the metal plate 44 configured to be rotatable in the housing 2 is farthest from the center (center of the opening 441) c of the rotation shaft. When the outer shape and the closest outer edge are different in outer shape and are rotated by a certain amount from the initial position where the outer edge is not rotated, the battery 6 in the battery storage portion 21a is locked. According to this structure, since the metal plate 44 electrically connected to the battery 6 is rotated to realize the lock mechanism, a member for fixing the battery 6 can be omitted. Thereby, simplification of a structure can be achieved. Further, since the lock mechanism is realized by using the metal plate 44, the metal plate 44 is more resistant to dropping impact than the case where the battery fixing structure is made of a resin material separately from the metal member that is electrically connected to the battery 6. As a result, the structure can be simplified, and a battery holding structure that is resistant to dropping impact can be provided.

  In particular, in the battery holding structure according to the present embodiment, when the metal plate 44 is attached to the lid body 41 and used, the lid body 41 and the metal plate 44 are integrated only by integrating the lid body 41 and the metal plate 44. Fastening parts such as screws for fixing to 2 can be eliminated. Thereby, the thickness dimension required for a fastening component can be excluded, and thickness reduction can be implement | achieved.

  In the battery holding structure according to the present embodiment, the center of the leg portion 411 of the operation member 42 that rotates the metal plate 44 from the outside of the housing 2 is the center of the rotation axis of the metal plate 44 (opening 441). Are connected so as to coincide with c). For this reason, the metal plate 44 can be easily rotated from the outside of the housing 2 via the operation member 42. As a result, the metal plate 44 can be locked from the outside of the housing 2, so that the lid body 41 can be fixed to the housing 2 without requiring a fastening operation with screws or the like.

  The present invention is not limited to the above embodiment, and can be implemented with various modifications. Moreover, there is no restriction | limiting in particular about the numerical value, dimension, material, and direction which were demonstrated by the said embodiment. Other modifications may be made as appropriate without departing from the scope of the object of the present invention.

  For example, in the above-described embodiment, a case has been described in which the metal plate 44 has an outer shape whose radial dimension is different from the center (center of the opening 441) c of the rotation axis. An arbitrary shape can be adopted as the metal plate 44 within a range satisfying such an external shape. For example, a circular shape in which the opening 441 is arranged eccentrically may be adopted.

  Moreover, in the said embodiment, the case where the battery 6 in the housing | casing 2 is fixed with the holding | maintenance unit 4 by which the cover body 41 and the metal plate 44 are arrange | positioned closely is demonstrated. However, the lid 44 is not necessarily required for the battery holding structure of the present invention. For example, the metal plate 44 is rotatably supported in the housing 2, and the metal plate 44 is rotated from the outside of the housing 2 to fix the battery 6 to the battery storage portion 21 a in the housing 2. May be.

  Furthermore, in the above-described embodiment, the case where the metal plate 44 is rotated from the outside of the housing 2 via the operation member 42 has been described. However, the configuration for rotating the metal plate 44 is not limited to the operation member 42 and can be changed as appropriate. For example, the metal plate 44 may be rotated by a tool such as a screwdriver. That is, the operation member 42 is not necessarily a necessary component and can be omitted. In this case, the number of parts of the holding unit 4 can be reduced, and the structure can be further simplified.

  Furthermore, in the above-described embodiment, a case where a plurality of (six) pins 416 are provided on the back surface of the lid 41 has been described. However, the number of pins 416 is not limited to this and can be changed as appropriate. One pin 416 may be provided on condition that a function of preventing erroneous loading of the battery 6 stored in the battery storage unit 21a and a function of guiding the rotation of the metal plate 44 are ensured.

DESCRIPTION OF SYMBOLS 1 Dosimeter 2 Case 21 Opening part 22 Recessed part 23 Enlarged part 24 Engagement wall 3 Display area 4 Holding unit 41 Cover body 41a Main body part 41b Protruding part 411 Through-hole 415 Protruding part 416, 416a, 416b Pin 42 Operation member 421 Head part 422 Leg part 422a Polygonal part 422b Screw hole 43 O-ring 44 Metal plate 44a, 44b Engagement part 441 Opening part 442 Guide groove 45 Washer 46 Fixing screw

Claims (5)

A battery holding structure comprising: a battery storage portion in which a battery is stored in a state in which the battery electrode is directed in a first direction; and a metal plate that contacts the battery electrode and is electrically connected to the battery,
The metal plate is rotatable in a plane orthogonal to the first direction, and the dimension to the outer edge farthest from the rotation axis is different from the dimension to the nearest outer edge. When the battery is rotated by a certain amount, the battery holding structure is in a locked state for fixing the battery in the battery housing portion. A battery housing part that is provided in the housing and houses the battery with the battery electrode facing in the first direction, and a battery formed on the outer wall of the housing that is on the extended line in the first direction as viewed from the battery housing unit A lid that is attached to the opening / closing opening, and a metal plate that is disposed on the attachment surface side of the lid and that is in contact with the battery electrode when the lid is attached to the opening / closing opening for the battery, A battery holding structure comprising:
The metal plate is rotatable in a plane perpendicular to the first direction with respect to the lid, and the dimension to the outer edge farthest from the rotation axis is different from the dimension to the nearest outer edge. A battery holding structure, wherein the battery holding structure is engaged with a part of the housing and fixed in the battery housing portion when the battery is turned by a certain amount from an initial position where the battery housing is not turned.   An operation member that rotates the metal plate from the outside of the housing is disposed on the outer surface of the lid opposite to the mounting surface of the lid, and the operation member has a rotation axis centered on the rotation axis of the metal plate. The battery holding structure according to claim 2, wherein the battery holding structure is connected so as to coincide with the battery.   One or more pins shorter than the convex part of the battery electrode on the positive electrode side of the battery are provided on the attachment surface of the lid, and the pin is arranged at a position where it does not interfere with the convex part of the battery electrode. The battery holding structure according to claim 2 or claim 3, wherein   5. The battery holding structure according to claim 2, wherein an O-ring surrounding a rotation shaft of the operation member is provided between the lid outer surface and the operation member.

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