JP5045910B2 - Seal structure of electronic equipment - Google Patents

Description

  The present invention relates to a sealing structure of an electronic device, and more particularly to a structure that seals water droplets from entering an electronic device such as a mobile phone terminal.

  For example, in a mobile phone terminal, as shown in FIG. 3, a housing 1 is formed by a combination of a case 11 and a lid 21 that are fitted to each other. A gasket is interposed so as not to enter. Conventionally, as shown in FIG. 4, a structure in which the gasket 31 is compressed in the fitting direction of the case 11 and the lid 21 (vertical direction in the figure) is employed as the gasket is interposed. Further, since a large gasket repulsive force acts when the lid 21 is fitted, there is an inconvenience that it is difficult to perform the fitting operation.

  Therefore, conventionally, as shown in FIG. 5, a rising wall 13 is provided on one peripheral surface portion of the case 11 and the lid 21, and an outer peripheral wall 22 is provided on the other peripheral surface portion, and between the rising wall 13 and the outer peripheral wall 22. A structure has been proposed in which the gasket 31 is compressed in a direction perpendicular to the fitting direction (left and right in the figure), and this structure facilitates fitting work because the gasket repulsive force is relatively small during fitting. can do.

  However, on the other hand, the case 11 and the lid 21 are made of a thin resin in order to reduce the size and weight, so that the distal end portion 22a of the outer peripheral wall 22 receives the gasket repulsive force in the outer peripheral direction (leftward in the figure). ) (Arrow C), and as a result, the required sealing surface pressure cannot be ensured and the sealing performance may be impaired.

JP 2006-033202 A

  In view of the above points, the present invention relates to a structure in which the gasket is compressed in a direction orthogonal to the fitting direction by the combination of the rising wall and the outer peripheral wall as described above, and the tip of the outer peripheral wall is expanded by the gasket repulsive force. It aims at providing the seal structure which can suppress this.

In order to achieve the above object, a seal structure according to claim 1 of the present invention is a seal structure in which a gasket is interposed between a case and a lid that are fitted together to form a casing of an electronic device, A fitting step portion having a rising wall parallel to the fitting direction of the case and the lid is provided on the peripheral surface portion of either the case or the lid, and the fitting step portion is provided on the outer peripheral side of the rising wall. In the seal structure in which the outer peripheral wall to be fitted is provided on the peripheral surface portion of the other member, and the gasket is interposed between the rising wall and the outer peripheral wall in a state compressed in the direction orthogonal to the fitting direction, the outer peripheral wall An engagement structure is provided between the front end portion of the outer peripheral wall and the stepped surface of the fitting stepped portion facing the front end portion to prevent the front end portion of the outer peripheral wall from expanding in a direction perpendicular to the fitting direction . The engagement structure A combination of a convex portion provided at the front end portion of the outer peripheral wall and a concave portion provided in the step surface of the fitting stepped portion, or a stepped surface of the concave portion provided at the front end portion of the outer peripheral wall and the fitting stepped portion. The convex portion and the concave portion are formed in a substantially triangular shape corresponding to each other, provided with a mounting groove for mounting the gasket on the outer peripheral surface of the rising wall, and the mounting groove The stepped surface of the fitting step portion is arranged so as to be displaced in the fitting direction .

Furthermore, the seal structure according to claim 2 of the present invention is the seal structure according to claim 1 described above, wherein the tip of the rising wall provided on one of the case and the lid and the other member opposed thereto. A second engagement structure comprising a combination of a convex portion and a concave portion is provided between the second engagement structure and the surface of the second engagement structure. It has a structure in which the first is engaged earlier.

  In the seal structure of the present invention having the above-described configuration, a fitting stepped portion provided with a rising wall on the peripheral surface portion of the case, for example, one of the case and the lid forming the casing of the electronic device is provided, An outer peripheral wall is provided on the peripheral surface portion of the other member, for example, a lid, and a gasket is interposed between the rising wall and the outer peripheral wall in a compressed state in a direction perpendicular to the fitting direction. Conventionally, since the distal end portion of the outer peripheral wall is in a free state with respect to the deformation, when the repulsive force of the gasket compressed in the above direction acts, the distal end portion of the outer peripheral wall spreads in the outer peripheral direction. Therefore, in the present invention, an engagement structure is provided between the front end portion of the outer peripheral wall and the step surface of the fitting step portion that opposes the front end portion, and the front end portion of the outer peripheral wall is obtained by the deformation suppressing action or the shape retaining action by the engagement structure. Decided to suppress the spread. As the engagement structure, a convex portion is provided at the front end of the outer peripheral wall so as to exhibit the above-described deformation suppressing action or shape retaining action, and no step is generated on the outer peripheral face of the case and the lid, and a concave portion is provided on the stepped face of the fitting stepped portion. It is desirable to engage this convex part and concave part, or conversely, provide a concave part at the tip of the outer peripheral wall and provide a convex part on the step surface of the fitting step part to engage this concave part and convex part. It is desirable to let them.

  In one embodiment of the present invention, a mounting groove is provided on the outer peripheral surface of the rising wall, and a gasket is mounted on the mounting groove. However, as described above, a fitting step portion is provided on the outer peripheral side of the rising wall. A step surface is disposed, and the tip of the outer peripheral wall is abutted against the step surface. Therefore, if the mounting groove and the step surface provided on the outer peripheral surface of the rising wall are arranged without displacement in the fitting direction, a part of the gasket mounted in the mounting groove is connected to the step surface and the tip of the outer peripheral wall. If there is a slight gap between the step surface and the tip of the outer peripheral wall, a part of the gasket attached to the mounting groove protrudes into the gap and is damaged. There are also concerns. Therefore, in order to prevent these, it is desirable to dispose the mounting groove and the step surface in a position displaced in the fitting direction. In this case, the gasket mounted in the mounting groove does not reach the step surface. And the tip of the outer peripheral wall, and does not protrude into the gap formed between the step surface and the tip of the outer peripheral wall.

  Further, in one embodiment of the present invention, a combination of a convex portion and a concave portion is provided between the leading end portion of the rising wall provided on one of the case and the lid and the surface of the other member facing the rising wall. A second engagement structure is provided. When the case and the lid are fitted, the second engagement structure is provided at the stepped surface and the distal end portion of the outer peripheral wall (also referred to as a first engagement structure). It is set as the structure engaged earlier than. Accordingly, since the second engagement structure that is engaged in advance as described above has an effect of guiding the engagement of the first engagement structure that is engaged later (after), the assembly workability of the case and the lid is improved. Can be improved.

  Therefore, according to the present invention, as described above, according to the intended purpose, the tip of the outer peripheral wall is compressed by the gasket repulsive force in the structure in which the gasket is compressed in the direction perpendicular to the fitting direction by the combination of the rising wall and the outer peripheral wall. The expansion can be suppressed, and thus the sealing performance by the gasket can be ensured. In addition, since the gasket is prevented from being sandwiched between the step surface and the tip of the outer peripheral wall or protruding into the gap formed between the step surface and the tip of the outer peripheral wall, damage to the gasket is prevented. Therefore, the sealing property by the gasket can be ensured also from this point. Further, when the second engagement structure is provided, the work of assembling the case and the lid can be improved by the guide action that this provides.

The present invention includes the following embodiments.
(1) To prevent opening deformation of the casing peripheral surface due to gasket repulsion, a protrusion is provided on one side of the joint of the casing, and a recess is provided on the other. Get the effect. Moreover, since the dimensional accuracy of the housing (resin) is better than the dimensional accuracy of the gasket (rubber-like elastic body), an appropriate gasket compression amount can be obtained depending on the positioning accuracy of the housing.
(2) Moreover, a convex part is provided in one side on the plane parallel to the joint line of a housing | casing, and a recessed part is provided in the other. At this time, the projecting amount of the convex portion is made larger than the projecting amount of the joint of the casings, thereby serving as a guide, thereby improving the assembling property.
(3) According to the above configuration, deformation of the housing can be suppressed, so that it is possible to secure an appropriate seal surface pressure and save space.

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

First embodiment ...
FIG. 1: has shown the principal part cross section of the seal structure which concerns on 1st Example of this invention, (A) has shown the state before fitting, (B) has each shown the state after fitting.

  In the figure, reference numerals 11 and 21 denote a case and a lid which are fitted together to form a casing (exterior case) of a mobile phone terminal which is a kind of electronic equipment. A gasket 31 is interposed. The peripheral surface portion of one case 11 is provided with a fitting step portion 12 having a rising wall 13 parallel to the fitting direction (vertical direction in the figure) of the case 11 and the lid 21, and the peripheral surface portion of the other lid 21. Is provided with an outer peripheral wall 22 fitted to the fitting step portion 12 on the outer peripheral side (right side in the figure) of the rising wall 13. A mounting groove 14 is provided on the outer peripheral surface of the rising wall 13, and a gasket 31 is mounted in the mounting groove 14, and the mounted gasket 31 is orthogonal to the fitting direction between the rising wall 13 and the outer peripheral wall 22. It is inserted in a compressed state in the direction (left and right direction in the figure). The mounting groove 14 and the stepped surface 15 of the fitting stepped portion 12 are arranged displaced by a predetermined distance d in the fitting direction.

  Further, the front end portion 22a of the outer peripheral wall 22 is orthogonal to the fitting direction between the front end portion (lower end portion in the figure) 22a of the outer peripheral wall 22 and the step surface 15 of the fitting step portion 12 facing the front end portion 22a. An engagement structure 41 that suppresses the expansion in the direction of the engagement is provided. In this embodiment, the engagement structure 41 includes a protrusion 42 provided on the tip 22a of the outer peripheral wall 22 and a fitting step. It is configured by a combination with a recess 43 provided on the step surface 15 of the part 12. Since the convex portion 42 and the concave portion 43 exert a deformation suppressing action or a shape retaining action of the outer peripheral wall 22 by engaging with each other, they are formed in cross-sectional shapes corresponding to each other, and are formed in a substantially triangular shape in the drawing.

  In the seal structure having the above-described configuration, the fitting step portion 12 including the rising wall 13 is provided on the peripheral surface portion of the case 11 which is one member forming the casing of the mobile phone terminal, and the lid 21 which is the other member. Since the outer peripheral wall 22 is provided on the peripheral surface portion of the gasket and the gasket 31 is interposed between the rising wall 13 and the outer peripheral wall 22 in a compressed state in a direction orthogonal to the fitting direction, FIG. 6 shows a comparative example. If the engagement structure 41 is not provided as shown, the tip 22a of the outer peripheral wall 22 expands in the outer peripheral direction (right direction in the figure) due to the repulsive force of the gasket 31 (arrow C). Since the engagement structure 41 is provided between the front end portion 22a of the wall 22 and the step surface 15 of the fitting step portion 12 facing the front end portion 22a, the deformation suppression by the engagement structure 41 is suppressed. Tip 22a of the outer peripheral wall 22 is possible to suppress the expansion by the use or shape-retaining effect. Therefore, a seal surface pressure having a predetermined size can be generated in the gasket 31 interposed between the rising wall 13 and the outer peripheral wall 22, so that necessary sealing performance can be ensured.

  Similarly, as shown in FIG. 6 as a comparative example, when the mounting groove 14 provided on the outer peripheral surface of the rising wall 13 and the step surface 15 are arranged without displacement in the fitting direction, the mounting groove 14 is mounted. The gasket 31 is partially damaged by being sandwiched between the step surface 15 and the front end portion 22a of the outer peripheral wall 22 or protruding into a gap formed between the step surface 15 and the front end portion 22a of the outer peripheral wall 22. In the present invention, since the mounting groove 14 and the stepped surface 15 of the fitting stepped portion 12 are displaced by a predetermined distance d in the fitting direction in the present invention, The attached gasket 31 does not reach the stepped surface 15 and therefore is not sandwiched or protruded. Therefore, it is possible to prevent the gasket 31 from being damaged due to the pinching or protrusion.

Second embodiment ...
FIGS. 2A and 2B show a cross section of the main part of the seal structure according to the second embodiment of the present invention. FIG. 2A shows a state before fitting, and FIG. 2B shows a state after fitting.

  In the figure, reference numerals 11 and 21 denote a case and a lid which are fitted together to form a casing (exterior case) of a mobile phone terminal which is a kind of electronic equipment. A gasket 31 is interposed. The peripheral surface portion of one case 11 is provided with a fitting step portion 12 having a rising wall 13 parallel to the fitting direction (vertical direction in the figure) of the case 11 and the lid 21, and the peripheral surface portion of the other lid 21. Is provided with an outer peripheral wall 22 fitted to the fitting step portion 12 on the outer peripheral side (right side in the figure) of the rising wall 13. A mounting groove 14 is provided on the outer peripheral surface of the rising wall 13, and a gasket 31 is mounted in the mounting groove 14, and the mounted gasket 31 is orthogonal to the fitting direction between the rising wall 13 and the outer peripheral wall 22. It is inserted in a compressed state in the direction (left and right direction in the figure). The mounting groove 14 and the stepped surface 15 of the fitting stepped portion 12 are arranged displaced by a predetermined distance d in the fitting direction.

  Further, the front end portion 22a of the outer peripheral wall 22 is orthogonal to the fitting direction between the front end portion (lower end portion in the figure) 22a of the outer peripheral wall 22 and the step surface 15 of the fitting step portion 12 facing the front end portion 22a. The first engagement structure 41 is provided to prevent the first engagement structure 41 from expanding in the direction in which the first engagement structure 41 is formed. It is configured by a combination with the concave portion 43 provided on the step surface 15 of the fitting step portion 12. Since the convex portion 42 and the concave portion 43 exert a deformation suppressing action or a shape retaining action of the outer peripheral wall 22 by engaging with each other, they are formed in cross-sectional shapes corresponding to each other, and are formed in a substantially rectangular cross section in the drawing. Further, a chamfered portion 23 is provided on the inner peripheral surface of the distal end portion 22 a of the outer peripheral wall 22 so that the outer peripheral wall 22 can be easily inserted into the outer peripheral side of the fitting stepped portion 12 and the gasket 31.

  Further, a concave portion 52 is provided at the tip portion (upper end portion in the drawing) of the rising wall 13 of the case 11, and a convex portion 53 is provided on the inner surface of the lid 21 facing the tip portion, and the concave portion 52 and the convex portion 53. Are engaged with each other, and the second engagement structure 51 is engaged before the first engagement structure 41 when the case 11 and the lid 21 are fitted. It is supposed to be a structure.

  In the seal structure having the above-described configuration, the fitting step portion 12 including the rising wall 13 is provided on the peripheral surface portion of the case 11 which is one member forming the casing of the mobile phone terminal, and the lid 21 which is the other member. Since the outer peripheral wall 22 is provided on the peripheral surface portion of the gasket and the gasket 31 is interposed between the rising wall 13 and the outer peripheral wall 22 in a compressed state in a direction orthogonal to the fitting direction, FIG. 6 shows a comparative example. If the engagement structure 41 is not provided as shown, the tip 22a of the outer peripheral wall 22 expands in the outer peripheral direction (right direction in the figure) due to the repulsive force of the gasket 31 (arrow C). Since the first engagement structure 41 is provided between the tip 22a of the wall 22 and the step surface 15 of the fitting step 12 facing the tip 22a, the first engagement structure 41 is used. Tip 22a of the outer peripheral wall 22 is possible to suppress the expansion by the shape inhibition or shape retention effect. Therefore, a seal surface pressure having a predetermined size can be generated in the gasket 31 interposed between the rising wall 13 and the outer peripheral wall 22, so that necessary sealing performance can be ensured.

  Similarly, as shown in FIG. 6 as a comparative example, when the mounting groove 14 provided on the outer peripheral surface of the rising wall 13 and the step surface 15 are arranged without displacement in the fitting direction, the mounting groove 14 is mounted. The gasket 31 is partially damaged by being sandwiched between the step surface 15 and the front end portion 22a of the outer peripheral wall 22 or protruding into a gap formed between the step surface 15 and the front end portion 22a of the outer peripheral wall 22. In the present invention, since the mounting groove 14 and the stepped surface 15 of the fitting stepped portion 12 are displaced by a predetermined distance d in the fitting direction in the present invention, The attached gasket 31 does not reach the stepped surface 15 and therefore is not sandwiched or protruded. Therefore, it is possible to prevent the gasket 31 from being damaged due to the pinching or protrusion.

  In this embodiment, a recess 52 is provided at the tip of the rising wall 13 of the case 11, and a protrusion 53 is provided on the inner surface of the lid 21 that faces the tip, and the recess 52 and the protrusion 53 are provided. The second engagement structure 51 made of a combination of the first engagement structure 41 and the second engagement structure 51 is configured to be engaged prior to the first engagement structure 41 when the case 11 and the lid 21 are fitted. ing. Therefore, since the second engagement structure 51 that is engaged in advance in this way has an effect of guiding the engagement of the first engagement structure 41 that is engaged later (after), the case 11 and the lid 21 are Assembly workability can be improved. The convex portion 53 of the second engagement structure 51 is higher than the convex portion 42 of the first engagement structure 41 so that the second engagement structure 51 is engaged before the first engagement structure 41. Is set larger.

BRIEF DESCRIPTION OF THE DRAWINGS It is principal part sectional drawing of the seal structure which concerns on 1st Example of this invention, Comprising: The same figure (A) is sectional drawing which shows the state before fitting of a case and a lid, The same figure (B) is after fitting. Cross section showing state It is principal part sectional drawing of the seal structure which concerns on 2nd Example of this invention, Comprising: The same figure (A) is sectional drawing which shows the state before fitting of a case and a lid | cover, The figure (B) is after fitting. Cross section showing state Explanatory diagram showing the general structure of a mobile phone terminal Sectional view of the main part of the seal structure according to the conventional example Sectional drawing of the principal part of the seal structure which concerns on another prior art example It is principal part sectional drawing of the seal structure which concerns on a comparative example, Comprising: The figure (A) is sectional drawing which shows the state before fitting of a case and a lid, The figure (B) is sectional drawing which shows the state after fitting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 11 Case 12 Fitting step part 13 Standing wall 14 Mounting groove 15 Step surface 21 Lid 22 Outer peripheral wall 22a Tip part 23 Chamfer 31 Gasket 41 Engagement structure (first engagement structure)
42,53 Convex part 43,52 Concave part 51 Second engagement structure

Claims (2)

A seal structure in which a gasket is interposed between a case and a lid that are fitted together to form a casing of an electronic device, and includes a rising wall parallel to the fitting direction of the case and the lid A stepped portion is provided on the peripheral surface portion of one member of the case and the lid, and an outer peripheral wall fitted to the fitting stepped portion on the outer peripheral side of the rising wall is provided on the peripheral surface portion of the other member. In a seal structure in which a gasket is interposed between a wall and an outer peripheral wall in a compressed state in a direction perpendicular to the fitting direction,
An engagement structure that suppresses the front end portion of the outer peripheral wall from expanding in a direction perpendicular to the fitting direction between the front end portion of the outer peripheral wall and the step surface of the fitting step portion facing the front end portion. Provided,
The engagement structure includes a combination of a convex portion provided at a tip portion of the outer peripheral wall and a concave portion provided on a step surface of the fitting step portion, or a concave portion provided at a tip portion of the outer peripheral wall and the fitting step. It consists of a combination with the convex part provided on the step surface of the part,
The convex portion and the concave portion are formed in a substantially triangular cross section corresponding to each other,
A mounting structure for mounting the gasket is provided on an outer peripheral surface of the rising wall, and the mounting groove and the stepped surface of the fitting stepped portion are arranged displaced in the fitting direction and arranged. . The seal structure according to claim 1 ,
A second engagement structure comprising a combination of a convex portion and a concave portion is provided between the tip of the rising wall provided on one of the case and the lid and the surface of the other member facing the rising wall; The electronic device sealing structure according to claim 1, wherein the second engaging structure is engaged earlier than the engaging structure according to claim 1 when the lid is fitted.

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