JP4340196B2 - Waterproof structure of electronic device case - Google Patents

Description

  The present invention relates to an electronic device, and more particularly, to a waterproof structure of the case.

  FIG. 8 is a cross-sectional view showing an example of a waterproof structure of a conventional electronic device case. In FIG. 8, 1 is a panel which is made of a resin which is a highly rigid material and forms a part of the case, 2 is a key top made of an elastomer member such as rubber, and 3 is a printed circuit board made of a highly rigid material. is there.

Panel 1 has not been shown to case are fastened so as to sandwich the key top 2 and the printed board 3. A rib 1 a formed in a loop shape on the panel 1 is fitted in a loop-shaped groove 2 a provided in the key top 2. The contour line in the natural state of the groove 2a is on the upper side of the blackened portion, but is pushed by the rib 1a in the assembled state so that the contour line is on the lower side of the blackened portion. That is, the blacked portion indicates a portion deformed by crushing the groove 2a. In this way, the groove 2a of the key top 2 is pressed against the rib 1a so as to be deformed, and a waterproof structure is configured.

FIG. 9 is a cross-sectional view showing another example of a waterproof structure of a conventional electronic device case. 9, the panel 1, the key top 2, the printed circuit board 3 are the same as those described in FIG. 8, panel 1 is secured to the to case (not shown). Further, a rib 1 a formed in a loop shape on the panel 1 is fitted in a loop-shaped groove 2 a provided in the key top 2.

  The contour line in the natural state of the groove 2a is the right end of the blackened portion, but is pushed by the rib 1a in the assembled state, and the contour line becomes the left end of the blackened portion. That is, the blacked portion indicates a portion deformed by crushing the groove 2a. In this way, the groove 2a of the key top 2 is pressed against the rib 1a so as to be deformed, and a waterproof structure is configured.

  According to the above-described conventional waterproof structure shown in FIG. 8, the key top 2 receives a pressing force in the direction indicated by the arrow A shown in the figure by the rib 1a. The printed circuit board 3 is supported by the reaction force in the direction B shown in the figure with the same pressing force.

  And if the rigidity of the printed circuit board 3 which is a member supporting the key top 2 is low, it may be deformed and adversely affect other places. Therefore, high mounting rigidity is necessary so that the printed circuit board 3 is not deformed by the reaction force. In addition, since there is only one place where water intrusion is stopped, there is a possibility that water may intrude if the abutting pressure decreases due to a dimensional error.

  According to the conventional waterproof structure shown in FIG. 9, the groove 2a of the key top 2 is deformed in the lateral direction by the rib 1a. For this reason, if there is a corner in the waterproof line, there is a risk that water may enter due to a gap formed in the corner due to a slight dimensional deviation within the tolerance. Therefore, there is a problem that it is necessary to make the dimensional tolerance strict and the manufacturing cost becomes high.

In the waterproof structure of the microphone case proposed in Japanese Patent Laid-Open No. 2000-59873, the waterproof state is maintained by pressure contact with the inner surface of the case due to the deformation of the hook-shaped portion 4c of the rubber packing. According to this waterproof structure, since the rigidity of rubber is low, sufficient pressure contact force cannot be obtained, and there is a risk of water leakage.
JP 2000-59873 A, paragraph 0009, FIG.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a waterproof structure for an electronic device case that is low in manufacturing cost and does not cause water leakage.

In the waterproof structure of the case of the electronic device according to the present invention, a groove is provided in an elastomer member that is pressed and supported via a printed circuit board in one case, and a rib provided in the other case is fitted to the groove so that both cases in the waterproof structure for the space enclosed watertight state, Rutotomoni is deformed by compressing the both inclined surfaces facing the wedge shape of the groove bottom of the groove as a wedge shape with two corners of the front end portion of the rib In the compressed state, a space is left between the wedge-shaped bottom of the groove and the tip of the rib .

  Further, in the waterproof structure, the rib is wedge-shaped and the wedge-shaped root is rounded and both inclined surfaces of the groove are compressed and deformed by the root.

  Further, in the waterproof structure, a tip of the rib is semicircular in cross section, and both inclined surfaces of the groove are compressed and deformed by the base of the semicircular shape.

  Further, in each waterproof structure, both wedge-shaped inclined surfaces of the groove have a convex cross-sectional shape.

Further, the waterproof structure of the case of the electronic device according to the present invention is such that a groove is provided in an elastomer member that is pressed and supported via a printed circuit board in one case, and a rib provided in the other case is fitted with the groove. in the waterproof structure for a space surrounded by the case and watertight, between the bottom and the rib of the tip of the wedge shape of the groove both sides in a compressed state to deform Rutotomoni compressed by the rib of the groove The space is left behind .

  Further, in the waterproof structure, the bottom portion of the groove is wedge-shaped, and both opposing inclined surfaces of the wedge shape are compressed and deformed at two corners of the tip portion of the rib.

  According to the waterproof structure of the electronic device case of the present invention, even if the contact pressure between the elastomer member and the rib is increased to improve the waterproof performance, the support portion of the elastomer member is not easily deformed. Moreover, even if there is a corner portion in the waterproof line, water leakage can be reliably prevented without increasing the dimensional accuracy.

  Furthermore, since the waterproof line is formed in two places, even if water leaks from the first waterproof line, the second waterproof line can prevent water leakage.

  The best mode for carrying out the present invention will be described below with reference to examples.

1 is a cross-sectional view showing a waterproof structure of an electronic device case according to Embodiment 1 of the present invention. Panel 1 in FIG. 1, the key top 2, the printed circuit board 3 are the same as those described in FIG. 8, panel 1 is secured to the to case (not shown). A rib 1 a formed in a loop shape on the panel 1 is fitted in a loop-shaped groove 2 a provided in the key top 2.

  The contour line in the natural state of the groove 2a is on the upper side of the blackened portion, but is pushed by the rib 1a in the assembled state, and the contour line is on the lower side of the blackened portion. That is, the blacked portion indicates a portion deformed by crushing the groove 2a. In this way, the groove 2a of the key top 2 is pressed against the rib 1a so as to be deformed, and a waterproof structure is configured.

  In this example, the cross section of the groove 2a of the key top 2 has two inclined slopes facing each other, and the rib 1a has a shape with rounded corners of the rectangular end. The slope of the groove 2a is deformed by being pressed by the corners of the rib 1a.

The magnitudes and directions of the force that presses the groove 2a of the key top 2 at both corners of the rib 1a are shown by A and B in the figure. The horizontal components of forces A and B are indicated by A1 and B1, and the vertical components of forces A and B are indicated by A2 and B2. Since the forces A1 and B1 have opposite directions and the same magnitude, only the stress is generated in the key top 2, and no force acting on the support portion of the key top 2 is generated.

The forces A2 and B2 have the same direction, and generate the reaction forces C and D shown in the figure at the support portion of the key top 2 . However, since the reaction force of C and D is the sum of the components of the forces A and B, the rib 1a as a whole becomes smaller than the sum of the forces that press the groove 2a of the key top 2, and as a result, the key top 2 is supported. The reaction force of the part is reduced and the deformation of the printed circuit board 3 is reduced.

  In addition, since the horizontal forces A1 and B1 generated in the key top 2 have opposite directions and the same magnitude, the horizontal deformation of the key top 2 is also reduced. And since a waterproof line is formed in two places with the groove | channel 2a of the rib 1a and the key top 2, waterproof performance improves.

  Further, even when the groove 2a has a corner portion, the rib 1a is pressed against the groove 2a by two horizontal forces having opposite directions, so that the groove 2a of the key top 2 is positioned on the rib 1a by deformation. As a result, gaps due to dimensional errors do not occur, and water leakage does not occur. As a result, sufficient waterproof performance can be obtained only by appropriately managing the amount of deformation caused by the abutment of the groove 2a.

2 is a cross-sectional view showing a waterproof structure of an electronic device case according to Embodiment 2 of the present invention. 2, panel 1, the key top 2, the printed circuit board 3 are the same as those described in FIG. 8, panel 1 is secured to the to case (not shown). A rib 1 a formed in a loop shape on the panel 1 is fitted in a loop-shaped groove 2 a provided in the key top 2. The contour line in the natural state of the groove 2a is on the upper side of the blackened portion, but is pushed by the rib 1a in the assembled state, and the contour line is on the lower side of the blackened portion. That is, the blacked portion indicates a portion deformed by crushing the groove 2a. In this way, the groove 2a of the key top 2 is pressed against the rib 1a so as to be deformed, and a waterproof structure is configured.

  In this example, the cross-section of the groove 2a of the key top 2 has two inclined slopes facing each other, and the rib 1a has a wedge-shaped base with rounded corners. The slope of the groove 2a is deformed by being pressed by the corners of the rib 1a.

  The rib 1a generates the horizontal component force and the vertical component force similar to those in the first embodiment in the groove 2a, and the same effects as those in the first embodiment can be obtained. In this example, when the rib 1a is pressed against the groove 2a of the key top 2, the key top 2 is not easily damaged along the inclined surface.

3 is a cross-sectional view showing a waterproof structure of an electronic device case according to Embodiment 3 of the present invention. 3, panel 1, the key top 2, the printed circuit board 3 are the same as those described in FIG. 8, panel 1 is secured to the to case (not shown). A rib 1 a formed in a loop shape on the panel 1 is fitted in a loop-shaped groove 2 a provided in the key top 2. The contour line in the natural state of the groove 2a is on the upper side of the blackened portion, but is pushed by the rib 1a in the assembled state, and the contour line is on the lower side of the blackened portion. That is, the blacked portion indicates a portion deformed by crushing the groove 2a. In this way, the groove 2a of the key top 2 is pressed against the rib 1a so as to be deformed, and a waterproof structure is configured.

  In this example, the cross section of the groove 2a of the key top 2 has two inclined slopes facing each other, and the rib 1a has a semicircular tip. The slope of the groove 2a is deformed by being pressed against the base of the semicircular portion of the rib 1a.

  The rib 1a generates the horizontal component force and the vertical component force similar to those in the first embodiment in the groove 2a, and the same effects as those in the first embodiment can be obtained. In this example, when the rib 1a is pressed against the groove 2a of the key top 2, the key top 2 is not easily damaged along the inclined surface. Further, the shape of the rib 1a is simple, and the manufacturing cost can be reduced.

4 is a cross-sectional view showing a waterproof structure of an electronic device case according to Embodiment 4 of the present invention. Panel 1 in FIG. 4, the key top 2, the printed circuit board 3 are the same as those described in FIG. 8, panel 1 is secured to the to case (not shown). A rib 1 a formed in a loop shape on the panel 1 is fitted in a loop-shaped groove 2 a provided in the key top 2.

  The contour line in the natural state of the groove 2a is on the upper side of the blackened portion, but is pushed by the rib 1a in the assembled state, and the contour line is on the lower side of the blackened portion. That is, the blacked portion indicates a portion deformed by crushing the groove 2a. In this way, the groove 2a of the key top 2 is pressed against the rib 1a so as to be deformed, and a waterproof structure is configured.

  In this example, the groove 2a of the key top 2 has two inclined surfaces sandwiching an inclined 90 [deg.] Opposing angle, and a rectangular portion is formed at the tip of the rib 1a. In addition, the corner of the tip of the rib 1a has a rounded shape, and the inclined surface of the groove 2a is pressed and deformed by the corner of the tip of the rib 1a.

  The rib 1a generates the horizontal component force and the vertical component force similar to those in the first embodiment in the groove 2a, and the same effects as those in the first embodiment can be obtained. In this example, since the narrow angle of the groove 2a of the key top 2 is large, it is easy to obtain a large contact pressure between the groove 2a of the key top 2 and the rib 1a, and it is easy to improve the waterproof performance.

5 is a cross-sectional view showing a waterproof structure of an electronic device case according to Embodiment 5 of the present invention. Panel 1 5, the key top 2, the printed circuit board 3 are the same as those described in FIG. 8, panel 1 is secured to the to case (not shown). A rib 1 a formed in a loop shape on the panel 1 is fitted in a loop-shaped groove 2 a provided in the key top 2.

  The contour line in the natural state of the groove 2a is on the upper side of the blackened portion, but is pushed by the rib 1a in the assembled state, and the contour line is on the lower side of the blackened portion. That is, the blacked portion indicates a portion deformed by crushing the groove 2a. In this way, the groove 2a of the key top 2 is pressed against the rib 1a so as to be deformed, and a waterproof structure is configured.

  In this example, the cross section of the groove 2a of the key top 2 is formed in an inclined convex circle shape. The rib 1a is formed with a rectangular portion at the tip, the corner of the tip of the rib 1a is rounded, and the slope of the groove 2a is pressed by the corner of the rib 1a and deformed. ing.

  The rib 1a generates the horizontal component force and the vertical component force similar to those in the first embodiment in the groove 2a, and the same effects as those in the first embodiment can be obtained. In this example, since the cross section of the groove 2a is a convex circular shape, the deformation of the key top 2 is limited to the convex circular portion, and the deformation of other portions is reduced.

6 is a cross-sectional view showing a waterproof structure of an electronic device case according to Embodiment 6 of the present invention. Panel 1 in FIG. 6, the key top 2, the printed circuit board 3 are the same as those described in FIG. 8, panel 1 is secured to the to case (not shown). A rib 1 a formed in a loop shape on the panel 1 is fitted in a loop-shaped groove 2 a provided in the key top 2.

  The contour line in the natural state of the groove 2a is on the inner side of the blackened portion, but is pushed by the rib 1a in the assembled state, so that the contour line becomes the outer side of black painting. That is, the blacked portion indicates a portion deformed by crushing the groove 2a. In this way, the groove 2a of the key top 2 is pressed against the rib 1a so as to be deformed, and a waterproof structure is configured.

  In this example, the width of the groove 2a of the key top 2 is smaller than the width of the rib 1a, and pressure contact portions are formed on both side surfaces of the rib 1a, so that the waterproof surface can be widened to improve the waterproof performance. Further, the reaction force of the support portion of the key top 2 is further reduced.

7 is a cross-sectional view showing a waterproof structure of an electronic device case according to Embodiment 7 of the present invention. Panel 1 7, the key top 2, the printed circuit board 3 are the same as those described in FIG. 8, panel 1 is secured to the to case (not shown). A rib 1 a formed in a loop shape on the panel 1 is fitted in a loop-shaped groove 2 a provided in the key top 2.

  The contour line in the natural state of the groove 2a is on the inner side of the blackened portion, but is pushed by the rib 1a in the assembled state, so that the contour line becomes the outer side of black painting. That is, the blacked portion indicates a portion deformed by crushing the groove 2a. In this way, the groove 2a of the key top 2 is pressed against the rib 1a so as to be deformed, and a waterproof structure is configured.

  In this example, the width of the groove 2a of the key top 2 is smaller than the width of the rib 1a, and pressure contact portions are formed on both side surfaces of the rib 1a. Further, a pressure contact force obtained by deforming both inclined surfaces of the groove 2a by the corner of the tip of the rib 1a is obtained. In this example, the width of the waterproof surface can be increased to improve the waterproof performance, and a large pressure contact force can be obtained at the tip of the rib 1a.

  The embodiment is configured as described above, but the invention is not limited to this. For example, the key top can be formed of another elastomer member such as synthetic rubber instead of rubber. It is also possible to use a packing having only a waterproof function instead of the key top.

It is sectional drawing which shows the waterproof structure of the electronic device case which is Example 1 of this invention. It is sectional drawing which shows the waterproof structure of the electronic device case which is Example 2 of this invention. It is sectional drawing which shows the waterproof structure of the electronic device case which is Example 3 of this invention. It is sectional drawing which shows the waterproof structure of the electronic device case which is Example 4 of this invention. It is sectional drawing which shows the waterproof structure of the electronic device case which is Example 5 of this invention. It is sectional drawing which shows the waterproof structure of the electronic device case which is Example 6 of this invention. It is sectional drawing which shows the waterproof structure of the electronic device case which is Example 7 of this invention. It is sectional drawing which shows the example of the waterproof structure of the conventional electronic device case. It is sectional drawing which shows the other example of the waterproof structure of the conventional electronic device case.

Explanation of symbols

1 Panel, 1a rib 2 Key top, 2a Groove 3 Printed circuit board

Claims (6)

In a waterproof structure in which a groove is provided in an elastomer member that is pressed and supported via a printed circuit board in one case, and a rib provided in the other case is fitted with the groove to make a space surrounded by both cases watertight, and the bottom of the wedge shape of the groove in a state where the bottom was compressed to deform Rutotomoni compressed in two corners of the front end portion of the opposing said ribs of both inclined surfaces of the wedge shape of the groove as a wedge shape of the groove A waterproof structure for an electronic device case, wherein a space is left between the rib end portions . The waterproof structure for an electronic device case according to claim 1, wherein the rib is wedge-shaped, the wedge-shaped root is rounded, and both inclined surfaces of the groove are compressed and deformed by the root. The waterproof structure for an electronic device case according to claim 1, wherein a tip of the rib has a semicircular cross section, and both inclined surfaces of the groove are compressed and deformed by a base of the semicircular shape. The waterproof structure for an electronic device case according to any one of claims 1 to 3, wherein both wedge-shaped inclined surfaces of the groove have a convex cross-sectional shape. In a waterproof structure in which a groove is provided in an elastomer member that is pressed and supported via a printed circuit board in one case, and a rib provided in the other case is fitted with the groove to make a space surrounded by both cases watertight, an electronic apparatus characterized in that to leave a space between the bottom and the rib of the tip of the wedge shape of the groove both sides in a compressed state to deform Rutotomoni compressed by the rib of the groove Waterproof structure of the case. 6. The waterproof structure for an electronic device case according to claim 5, wherein the bottom of the groove is wedge-shaped, and both opposing inclined surfaces of the wedge-shaped are compressed and deformed at two corners of the tip of the rib. .

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