JP2017112262A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus having a waterproof structure, assembly of which is improved without increasing the number of components.SOLUTION: In an electronic apparatus 100 including a wiring board 40 mounting an electronic circuit 45, and a case 20 to which the wiring board 40 is attached, a hole 7 is provided in the upper surface 21 of the case 20, a rubber sheet 10 is attached to the side of the wiring board 40 facing the hole 7, a salient 11 is provided on the rubber sheet 10, and the pushing surface 11b on the upper surface 21 of the salient 11 is pressed against the case 20 so as to close the hole 7.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electronic device equipped with an electronic circuit, and particularly to an electronic device having a waterproof structure.

  In an electronic device equipped with an electronic circuit, when a liquid such as water or a drink enters the electronic device, the electronic circuit provided on the wiring board gets wet, causing an electrical failure such as a short circuit of the electronic circuit. Accidents such as failures and malfunctions of mechanical parts on the wiring board are caused. In order to prevent such an accident, there is a waterproof structure corresponding to an electronic device that may be splashed with liquid such as water or drink. As a waterproof structure of such a conventional electronic device, a structure of a key top 900 described in Patent Document 1 below is known. The structure of the key top 900 will be described with reference to FIG.

  The key top 900 is provided in a public telephone. A hole 904a is formed in the front surface portion 904 of the apparatus main body, and a push button 913 is slidable in the hole 904a. When the push button 913 is pressed, the contact 915a of the switch device 915 contacts the contact substrate 914 to close the pattern contact. An annular groove 913c that is orthogonal to the pressing direction of the push button 913 is provided on the peripheral surface of the cylindrical portion 913a of the push button 913. A flexible thin plate-like packing 920 having a hole 920 a that engages with the groove 913 c is disposed on the back surface of the front surface portion 904.

  With such a structure, it is possible to provide waterproofing and dustproofing, and to prevent deterioration of operational feeling and malfunction of contacts.

Japanese Utility Model Publication No. 5-090757

  However, in the key top 900, a rubber sheet for the switch device 915 covers the wiring board, and a packing 920 is provided as a waterproof component separately from the rubber sheet. For this reason, the number of parts has increased. As a result, there are problems that the cost for manufacturing the electronic device is increased and the assemblability is deteriorated.

  The present invention has been made in view of such a state of the art, and an object of the present invention is to provide an electronic apparatus having a waterproof structure with improved assemblability without increasing the number of parts.

  In order to solve the above problems, an electronic device of the present invention is an electronic device including a wiring board on which an electronic circuit is mounted and a case to which the wiring board is attached, and a hole is formed in an upper surface portion of the case A rubber sheet is attached to the side of the wiring board facing the hole, the rubber sheet has a convex portion, and the convex portion is provided on the upper surface side of the convex portion. The pressing surface is pressed against the case so as to close the hole.

  The electronic device configured in this way is provided with a waterproof part that closes the hole provided in the case and is integrated with the rubber sheet attached to the wiring board, so that it is easy to assemble without increasing the number of parts. The waterproof structure can be improved.

  In the above configuration, the rubber sheet is a waterproof cover that covers the entire wiring board.

  The electronic device configured in this way has a structure in which the rubber sheet covers the entire wiring board, so that even if a small amount of water enters, the rubber sheet can reliably waterproof the wiring board. There is no trouble such as short circuit.

  Moreover, in said structure, it has the characteristics that the thickness of the area | region of the pressing surface of the said convex part is thicker than the thickness of the area | region of an adjacent surface.

  In the electronic device configured in this way, since the thickness of the pressing surface of the convex portion is increased, the convex portion is formed by pressing the pressing surface to the hole portion and deforming the thickness of this region in the thickness direction. It is possible to absorb the dimensional variation in the thickness direction and more reliably close the hole. Moreover, since the thickness of the area | region of an adjacent surface is not thickened, the increase in the usage-amount of material can be suppressed.

  In the above configuration, a protrusion is provided on the lower surface portion of the case, and a support surface on the upper surface portion side of the protrusion supports the convex portion.

  In the electronic device configured in this way, since the support surface of the protrusion is in contact with the lower side (back side) of the pressing surface of the convex portion, even when the distance from the wiring board to the hole is long, The hole can be reliably closed without increasing the number of parts.

  Moreover, in said structure, it has the switch apparatus provided with the rubber dome, and has the characteristics that a part of said rubber sheet | seat is the said rubber dome.

  The electronic device configured in this way does not increase the number of parts because a part of the rubber sheet is also used as the rubber dome of the switch device.

  In the electronic device according to the present invention, the waterproof part for closing the hole provided in the case is provided integrally with the rubber sheet attached to the wiring board, so that the assemblability is improved without increasing the number of parts. It can be a waterproof structure.

It is a perspective view which shows the external appearance of the electronic device in 1st Embodiment of this invention. It is a top view of an electronic device. It is sectional drawing which shows the structure of an electronic device. It is sectional drawing which shows the structure of the electronic device in 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the electronic device in 3rd Embodiment of this invention. It is sectional drawing which shows the structure of the electronic device which concerns on a prior art example.

  Hereinafter, embodiments of an electronic apparatus according to the present invention will be described with reference to the drawings. The electronic device of the present invention is an electronic device that may be splashed with liquids such as water and drinks, for example, and has a plurality of holes for design formed on the upper surface of a case that is a housing. is there. The electronic apparatus of the present invention may be an electronic apparatus that is connected to an external device and operates the external device. The application of the electronic device of the present invention is not limited to this, and can be changed as appropriate. Further, in this specification, unless otherwise specified, the X1 side of each drawing is described as the right side, the X2 side as the left side, the Y1 side as the back side, the Y2 side as the near side, the Z1 side as the upper side, and the Z2 side as the lower side. To do.

[First Embodiment]
First, the structure of the electronic device 100 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing an external appearance of the electronic device 100, and FIG. 2 is a plan view of the electronic device 100. FIG. 3 is a cross-sectional view showing an internal structure of the electronic device 100 when the left direction is viewed from the line AA shown in FIG.

  As shown in FIG. 1, the electronic device 100 has a case 20 having a substantially rectangular parallelepiped shape. As shown in FIGS. 1 and 3, the case 20 includes an upper surface portion 21, a lower surface portion 23 provided to face the upper surface portion 21, and a side surface portion 25 that surrounds four directions. The case 20 is made of synthetic resin or the like.

  As shown in FIGS. 1 and 2, the upper surface portion 21 is provided with a display portion 21 a for displaying information inside or outside the electronic device 100. For example, when the electronic device 100 is connected to an external device, the display unit 21a displays the state of the external device. The display unit 21a may be provided with an operation unit for operating the external device.

  In the upper surface portion 21 of the case 20, a plurality of holes 7 for design are provided in addition to the display portion 21a. As shown in FIG. 2, each of the plurality of hole portions 7 has a circular shape in plan view, and is arranged at a predetermined interval from each other. The hole 7 may have a polygonal shape other than the circular shape. Moreover, the hole part 7 has penetrated the thickness direction (up-down direction) of the upper surface part 21, as shown in FIG.

  As shown in FIG. 3, a wiring board 40 is attached in the case 20. An electronic circuit 45 constituted by a wiring pattern and electronic components (not shown) is mounted on the upper surface of the wiring board 40. The electronic circuit 45 is electrically connected to a circuit in the display unit 21 a provided on the upper surface unit 21. The electronic circuit 45 may be provided on the lower surface of the wiring board 40 in addition to the upper surface of the wiring board 40.

  A rubber sheet 10 is attached to the side of the wiring board 40 facing the hole 7 so as to cover the electronic circuit 45. The rubber sheet 10 is a waterproof cover that covers the entire wiring board 40. The rubber sheet 10 is made of an elastic material such as elastomer and can be elastically deformed. Note that the rubber sheet 10 may be provided so as to partially cover the wiring board 40 as long as the rubber sheet 10 includes not only the entire wiring board 40 but also electronic components constituting the electronic circuit 45.

  The rubber sheet 10 mounted on the wiring board 40 is provided with a convex portion 11, and the pressing surface 11 b on the upper surface portion 21 side of the convex portion 11 covers the hole portion 7 provided in the upper surface portion 21. Is pressed against the case 20. The convex portion 11 has a cylindrical shape having a space region 11a inside. The convex portion 11 may have a prismatic shape other than the cylindrical shape, and the pressing surface 11 b of the convex portion 11 only needs to have a size that at least closes the hole portion 7. By pressing the pressing surface 11 b of the convex portion 11 of the rubber sheet 10 against the case 20 and closing the hole 7, it is possible to prevent liquid such as water from entering from the hole 7.

  The thickness of the region of the pressing surface 11 b on the upper surface portion 21 side of the convex portion 11 is thicker than the thickness of the region of the adjacent surface of the convex portion 11. Since the thickness of the area of the pressing surface 11b is more elastically deformable than the area of the other surface, the area of the pressing surface 11b is the same as the case 20 in the area of the pressing surface 11b. When pressed, the shape is deformed in the thickness direction, and the dimensional variation in the thickness direction of the convex portion 11 is absorbed. As a result, the pressing surface 11 b of the convex portion 11 can be brought into close contact with the case 20. Moreover, since the thickness of the area | region of an adjacent surface is not thickened, the increase in the usage-amount of material can be suppressed.

[Second Embodiment]
Next, the structure of the electronic device 200 according to the second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view showing an internal structure of the electronic device 200. The only structural differences between the electronic device 200 and the electronic device 100 are the provision of the protrusions 57 and the structure of the wiring board 60. Therefore, the description is omitted except for the matters relating to the protrusion 57 of the case 50 and the wiring board 60. Moreover, the code | symbol provided to the electronic device 100 is used as it is with respect to another structural requirement.

  As illustrated in FIG. 4, the case 50 of the electronic device 200 includes an upper surface portion 21, a lower surface portion 53 provided to face the upper surface portion 21, and a side surface portion 25 that surrounds four directions.

  A cylindrical projection 57 is provided on the lower surface 53 of the case 50 so as to protrude upward from the lower surface 53. Since the protrusion 57 is configured integrally with the case 50, it is formed of the same synthetic resin as the case 50. The protrusion 57 may have a prismatic shape other than the cylindrical shape.

  In addition, an insertion hole 65 that penetrates the wiring board 60 in the thickness direction (vertical direction) is provided at a position of the wiring board 60 where the protrusions 57 are located in plan view. The protrusion 57 is inserted from below through the insertion hole 65 of the wiring board 60 and is inserted into the space region 11 a in the convex portion 11 of the rubber sheet 10 on the wiring board 60. Then, the support surface 57a on the upper surface portion 21 side of the projection portion 57 contacts the lower side (back side) of the pressing surface 11b on the upper surface portion 21 side of the convex portion 11 described above. Therefore, the support surface 57a of the protrusion 57 supports the entire protrusion 11 of the rubber sheet 10 so as not to buckle, and strongly presses the pressing surface 11b of the protrusion 11 so as to close the hole 7 of the case 20. The pressing surface 11b can be brought into close contact with the case 20.

[Third Embodiment]
Next, with reference to FIG. 5, the structure of the electronic device 300 according to the third embodiment of the present invention will be described. FIG. 5 is a cross-sectional view showing the internal structure of electronic device 300. The structural difference between the electronic device 300 and the electronic device 100 is that the electronic device 300 is provided with the switch device 30, and accordingly, the shape of the rubber sheet 70 is different from the rubber sheet 10 of the electronic device 100. And the configuration of the electronic circuit 85 is different. Therefore, explanations of those other than those relating to these are omitted. Moreover, the code | symbol provided to the electronic device 100 is used as it is with respect to another structural requirement.

  As shown in FIG. 5, a wiring board 40 is attached in the case 20 of the electronic device 300. In addition, an electronic circuit 85 constituted by a wiring pattern or an electronic component (not shown) is mounted on the upper surface of the wiring board 40. The electronic circuit 85 is connected to the display unit 21 a provided on the upper surface unit 21.

  A rubber sheet 70 is attached to the side of the wiring board 40 facing the hole 7 so as to cover the electronic circuit 85. The rubber sheet 70 is a waterproof cover that covers the entire wiring board 40. The rubber sheet 70 may be provided so as to partially cover the wiring board 40 as long as the rubber sheet 70 includes not only the entire wiring board 40 but also an electronic component constituting the electronic circuit 85.

  The electronic device 300 includes a switch device 30 that includes a rubber dome 31. A contact 33 is provided on the back side (lower side) of the central surface of the rubber dome 31 of the switch device 30. By pressing the front side (upper side) of the central surface of the rubber dome 31, the switch device 30 is pressed. 30 is configured to be conductive. The electronic circuit 85 is provided with an electrode (not shown) for contacting the contact 33 of the switch device 30 when the switch device 30 is pressed, and a circuit corresponding to the switch device 30 is incorporated. ing.

  In the electronic device 300, a part of the rubber sheet 70 is the rubber dome 31 of the switch device 30. That is, as shown in FIG. 5, a part of the rubber sheet 70 is lifted upward and formed into a dome shape, and this dome-shaped portion forms the rubber dome 31 of the switch device 30. Yes. Therefore, the rubber sheet 70 serves as both the waterproof cover that covers the entire wiring board 40 and the rubber dome 31 of the switch device 30.

  An operation unit for operating the switch device 30 may be provided below the display unit 21 a on the upper surface unit 21 of the case 20.

  Hereinafter, the effect by having set it as this embodiment is demonstrated.

  Since the electronic device 100 is integrally provided with the rubber sheet 10 attached to the wiring board 40, the waterproof portion for closing the hole 7 provided in the case 20 is provided, so that the assembling property can be improved without increasing the number of components. An improved waterproof structure can be obtained.

  Further, since the rubber sheet 10 covers the entire wiring board 40, even if a small amount of water enters, the rubber sheet 10 can reliably waterproof the wiring board 40, and the electronic circuit 45 is short-circuited. It will not cause any trouble.

  Further, since the thickness of the pressing surface 11b on the upper surface portion 21 side of the convex portion 11 is increased, the pressing surface 11b of the convex portion 11 is crimped to the hole 7 to deform the thickness of this region in the thickness direction. By doing so, the dimensional variation in the thickness direction of the convex portion 11 can be absorbed, and the hole portion 7 can be closed more reliably. Moreover, since the thickness of the area | region of an adjacent surface is not thickened, the increase in the usage-amount of material can be suppressed.

  In the electronic device 200, the support surface 57 a on the upper surface portion 21 side of the protrusion portion 57 is supported by contacting the lower side (back side) of the pressing surface 11 b on the upper surface portion 21 side of the protrusion 11. Even when the distance to the hole 7 is long, the hole 7 can be reliably closed without increasing the number of parts.

  The electronic device 300 does not increase the number of parts because part of the rubber sheet 70 is also used as the rubber dome 31 of the switch device 30.

  As described above, in the electronic device of the present invention, the waterproof part for closing the hole provided in the case is provided integrally with the rubber sheet attached to the wiring board, so that the number of parts is not increased. The waterproof structure with improved assemblability can be obtained.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the third embodiment of the present invention, the electronic device 300 is configured based on the electronic device 100, but may be configured based on the electronic device 200.

7 hole portion 10 rubber sheet 11 convex portion 11a space region 11b pressing surface 20 case 21 upper surface portion 21a display portion 23 lower surface portion 25 side surface portion 30 switch device 31 rubber dome 33 contact point 40 wiring board 45 electronic circuit 50 case 53 lower surface portion 57 Protrusion 57a Support surface 60 Wiring board 65 Insertion hole 70 Rubber sheet 85 Electronic circuit 100 Electronic device 200 Electronic device 300 Electronic device

Claims (5)

A wiring board on which an electronic circuit is mounted, and a case to which the wiring board is attached,
A hole is provided on the upper surface of the case, and a rubber sheet is attached to the side of the wiring board facing the hole,
The rubber sheet is provided with a convex portion, and the pressing surface on the upper surface side of the convex portion is pressed against the case so as to block the hole portion,
An electronic device characterized by that. The rubber sheet is a waterproof cover that covers the entire wiring board.
The electronic device according to claim 1, wherein the electronic device is an electronic device. The thickness of the area of the pressing surface of the convex portion is thicker than the thickness of the area of the adjacent surface,
The electronic device according to claim 1, wherein the electronic device is an electronic device. A protrusion is provided on the lower surface of the case, and a support surface on the upper surface side of the protrusion supports the protrusion.
The electronic device according to claim 1, wherein the electronic device is an electronic device. Having a switch device with a rubber dome,
A part of the rubber sheet is the rubber dome,
The electronic apparatus according to claim 1, wherein the electronic apparatus is an electronic apparatus.

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