JP2010118425A - Housing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a housing structure produced by: confronting a peripheral wall 21 of a first casing member 2 with a peripheral wall 31 of a second casing member 3 to constitute a housing 1; providing circular first resin part 5 and second resin part 4 in the inside of both the peripheral wall 21 and the peripheral wall 31 respectively; and interposing a sealing ring 6 between the opposite faces of both resin parts 5, 4, where the resin parts 5, 4 are miniaturized and satisfactory waterproof effect is imparted to the housing 1. <P>SOLUTION: In this housing structure: the first resin part 5 and the second resin part 4 are joined to the insides of the peripheral walls 21, 31 respectively by a thermal fusion; in the circumference region of the opposite face of the first resin part 5, a peripheral groove 52 opened opposite to the second resin part 4 and opened opposite to the first casing material 2 is provided in a caving condition, and in the circumference region of the opposite face of the second resin part 4, a projection 41 engaging with the peripheral groove 52 of the first resin part 5 is provided in a projecting condition; and the sealing ring 6 is clamped between the peripheral groove 52 and the projection 41. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a housing structure having a housing formed by joining a pair of case members to each other and sealing an internal space of the housing.

  Conventionally, in an electronic component such as a digital camera, a pair of case members are joined to each other to form a casing, and an optical component or an electronic component is arranged inside the casing. When waterproofing is required, a waterproof structure using a seal ring is employed (see Patent Documents 1 and 2).

For example, in the waterproof structure shown in FIGS. 4 and 5, the casing (7) includes a first case member (71) and a second case member (72) made of metal, respectively, and the peripheral wall of the first case member (71). (71a) and the peripheral wall (72a) of the second case member (72) abut each other to form an internal space.
On the inner surfaces of the peripheral walls (71a) and (72a) of the first case member (71) and the second case member (72), respectively, an annular first resin component (74) and a second resin, which are prepared in advance by resin molding, are used. A part (73) is provided, and a rubber seal ring (61) is interposed between the opposing surfaces of both resin parts (74) and (73).
The first case member (71) and the second case member (72) are fastened to each other using a plurality of screws (not shown).

  Here, the opposing surfaces of the first resin component (74) and the second resin component (73) are each composed of an inner peripheral region, an intermediate region, and an outer peripheral region surrounding the internal space, and the first resin component (74) A circumferential groove (78) opening facing the second resin component (73) is recessed in the intermediate region of the opposing surface, while the intermediate region of the opposing surface of the second resin component (73) is A protrusion (75) that engages with the peripheral groove (78) of one resin part (74) is projected, and the peripheral groove (78) of the first resin part (74) and the protrusion of the second resin part (73). The internal space is sealed by sandwiching the seal ring (61) with (75).

When a plurality of screws fastening the first case member (71) and the second case member (72) are tightened, the seal ring (61) receives a clamping pressure as shown in FIG. In accordance with this, the outer circumferential surface of the seal ring (61) is formed on the bottom surface of the circumferential groove (78) of the first resin component (74) and on both sides of the circumferential groove (78). The outer surface of the casing (7) is pressed against the inner surface of the pair of ribs (76) and (77) and the tip surface of the protrusion (75) of the second resin component (73) with sufficient surface pressure. It reliably prevents the passage of moisture entering through the
JP 2008-166520 A JP 2007-192720 A

  However, in the housing structure shown in FIGS. 4 and 5, a circumferential groove (78) is formed on the opposing surface of the first resin component (74), and a pair of ribs are formed on both sides of the circumferential groove (78). (76) Since (77) is formed, the wall thickness W of the first resin component (74) and the second resin component (73) is such that the circumferential groove (78), the width, and the two ribs (76) ( The sum of the widths 77) increases the value of the wall thickness. As a result, the internal space is narrowed or the casing (7) is enlarged.

  Therefore, as shown in FIG. 6, the present inventors open on the facing surface of the first resin part (84) so as to face the second resin part (83) and face the first case member (81). A circumferential groove (87) is formed, and a rib (86) is projected only on one side of the circumferential groove (87), while a first resin component (83) is formed on the opposing surface of the second resin component (83). By adopting a housing structure in which the ridges (85) engaged with the circumferential grooves (87) of 84) are projected, the above-mentioned drawbacks are overcome. According to the housing structure, the thickness W ′ of the first resin component (84) and the second resin component (83) is the total value of the width of the circumferential groove (87) and the width of one rib (86). The thickness value is small.

  However, it has been found that the case structure shown in FIG. 6 cannot provide a sufficient waterproof effect. Thus, the inventors have investigated the cause, and the following phenomenon has been clarified.

  That is, in the housing structure shown in FIG. 6, when a plurality of screws that fasten the first case member (71) and the second case member (72) are tightened, the seal ring elastically deformed into an elliptical cross section ( The elastic repulsive force of 61) acts as a unidirectional spreading force on the rib (86) of the first resin component (84), and the end of the first resin component (84) becomes the first as shown in the figure. One case member (71) is deformed in a direction away from the inner surface. Along with this, the space in which the seal ring (6) is to be confined is enlarged. As a result, the outer peripheral surface of the seal ring (61), the inner surface of the rib (86) of the first resin component (84), and the first case. The pressure-bonding force with the inner surface of the member (71) is weakened, and a sufficient waterproof effect cannot be obtained.

  The housing structure according to the present invention is based on the above-described knowledge, and includes a peripheral wall (21) of the first case member (2) and a peripheral wall (31) of the second case member (3). The casing (1) having a sealed inner space is configured by butting each other, and the inner surfaces of the peripheral walls (21) and (31) of the case members (2) and (3) respectively surround the inner space. An annular first resin part (5) and a second resin part (4) are provided, and a seal ring (6) is interposed between the opposing surfaces of both resin parts (5) and (4).

Here, the first resin component (5) and the second resin component (4) are placed on the inner surface of the peripheral wall (21) of the first case member (2) and the inner surface of the peripheral wall (31) of the second case member (3). Each is joined by thermal fusion.
The opposing surfaces of both resin parts (5) and (4) are each composed of an inner peripheral region and an outer peripheral region surrounding the internal space. The outer peripheral region of the opposing surface of the first resin component (5) 2 A circumferential groove (52) opened opposite to the resin part (4) and opened to face the first case member (2) is recessed, while an outer periphery of the opposing surface of the second resin part (4). In the region, a protrusion (41) that engages with the circumferential groove (52) of the first resin component (5) is projected, and the circumferential groove (52) of the first resin component (5) and the second resin component are projected. The internal space is hermetically sealed by sandwiching the seal ring (6) with the ridge (41) of (4).

Specifically, the first resin component (5) and the second resin component (4) are respectively formed on the inner surfaces of the peripheral walls (21) and (31) of the first case member (2) and the second case member (3). On the other hand, it is formed by injection molding of a thermoplastic resin.
The thermoplastic resin is a resin containing an olefin resin modified with an unsaturated carboxylic acid or a derivative thereof.

  According to the housing structure of the present invention, the first resin component (5) and the second resin component (4) are formed by the inner surface of the peripheral wall (21) of the first case member (2) and the second case member (3). Between the peripheral groove (52) of the first resin component (5) and the protrusion (41) of the second resin component (4). When the seal ring (6) is clamped, even if the clamping pressure acts as a unidirectional spreading force on the rib (51) of the first resin component (5), the first resin component (5) Since it is joined to the first case member (2) by heat fusion and the joining force is large, the end of the first resin component (5) may be deformed in a direction away from the first case member (2). There is no.

  Therefore, the outer peripheral surface of the seal ring (6) has the bottom surface of the circumferential groove (52) of the first resin component (5) and the side surface of one rib (51) formed on one side of the circumferential groove (52). The inner surface of the first case member (2) and the front end surface of the ridge (41) of the second resin component (4) are pressed with sufficient surface pressure and enter from the outside of the housing (1). Make sure to prevent the passage of moisture.

  In the housing structure according to the present invention, the thickness of the first resin component (5) and the second resin component (4) is the width of the circumferential groove (52) of the first resin component (5) and one rib (51). ), And the wall thickness value is smaller than the conventional one. Therefore, it is possible to reduce the size of the first resin component (5) and the second resin component (4). The expansion of the internal space of (1) or the miniaturization of the housing (1) can be realized, and still a sufficient waterproof effect can be obtained for the housing (1).

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
In the case structure of an electronic apparatus according to the present invention, as shown in FIG. 1, a metal first case member (2) and a first case member (2) are joined to each other to have a rectangular parallelepiped having an internal space. The first case member (2) and the second case member (3) each have a peripheral wall (21) (31) surrounding the internal space.
An electronic component and an optical component (not shown) are accommodated in the internal space of the housing (1).

As shown in FIGS. 2 and 3, the inner space of the casing (1) is provided on the inner surface of the peripheral wall (21) of the first case member (2) and the inner surface of the peripheral wall (31) of the second case member (3), respectively. An annular first resin component (5) and a second resin component (4) are joined.
The first resin component (5) and the second resin component (4) are thermoplastic resins with respect to the inner surfaces of the peripheral walls (21) and (31) of the first case member (2) and the second case member (3), respectively. Is heat-sealed to the inner surfaces of the peripheral walls (21) and (31) by injection molding (outsert molding). As the thermoplastic resin, a resin containing an olefin resin modified with an unsaturated carboxylic acid or a derivative thereof is used (see, for example, JP-A-2002-225073).

The opposing surfaces of the first resin component (5) and the second resin component (4) are each composed of an inner peripheral region and an outer peripheral region surrounding the inner space of the housing (1), and the first resin component (5) In the outer peripheral area of the facing surface, a circumferential groove (52) that opens to face the second resin component (4) and opens to face the first case member (2) is recessed, while the second resin On the outer peripheral area of the facing surface of the component (4), a protrusion (41) that engages with the peripheral groove (52) of the first resin component (5) is provided.
A rubber seal ring (6) is interposed between the circumferential groove (52) of the first resin component (5) and the protrusion (41) of the second resin component (4), and is sandwiched from above and below. It is pressed. Thus, the seal ring (6) is elastically deformed from a circular cross section to an elliptic cross section.

  As a result, the outer peripheral surface of the seal ring (6) is the bottom surface of the circumferential groove (52) of the first resin component (5) and the side surface of one rib (51) formed on one side of the circumferential groove (52). And the inner surface of the first case member (2) and the tip surface of the ridge (41) of the second resin component (4) are pressed with sufficient surface pressure to enter from the outside of the housing (1). To prevent the passage of moisture.

Here, the elastic repulsive force of the seal ring (6) acts as a unidirectional spreading force on the rib (51) of the first resin component (5), but the first resin component (5) Is strongly bonded to the inner surface of the peripheral wall (21) of the first case member (2) by heat fusion, so that the first resin component (5) is not peeled off from the first case member (2).
Therefore, the space in which the seal ring (6) is confined does not expand, and a sufficient waterproof effect by the seal ring (6) is maintained.

  According to the housing structure, the thickness T of the first resin component (5) and the second resin component (4) is equal to the width of the circumferential groove (52) of the first resin component (5) and one rib (51). Since the thickness value is smaller than the thickness value in the conventional casing structure shown in FIG. 5, the first resin component (5) and the second resin component (4) can be reduced in size. As a result, the internal space of the housing (1) can be expanded or the housing (1) can be downsized.

It is a perspective view which shows the external appearance of the housing | casing which has the housing structure concerning this invention. It is an expanded sectional view which follows the AA line of FIG. It is a disassembled perspective view of the housing | casing which has a housing | casing structure which concerns on this invention. It is a disassembled perspective view of the conventional housing | casing. It is sectional drawing of the conventional housing | casing corresponding to FIG. It is sectional drawing explaining the malfunction in the housing | casing structure which narrowed the width | variety of the resin component.

Explanation of symbols

(1) Case
(2) First case member
(21) Perimeter wall
(3) Second case member
(31) Perimeter wall
(5) First resin part
(51) Rib
(52) Circumferential groove
(4) Second resin part
(41) Convex
(6) Seal ring

Claims (3)

The first case member and the second case member are provided, the peripheral wall of the first case member and the peripheral wall of the second case member are butted against each other to form a housing having a sealed internal space, and the peripheral walls of the two case members In the inner surface structure of the electronic component in which the annular first resin component and the second resin component surrounding the internal space are respectively provided, and the seal ring is interposed between the opposing surfaces of the two resin components,
The first resin component and the second resin component are bonded to the inner surface of the peripheral wall of the first case member and the inner surface of the peripheral wall of the second case member, respectively, and the opposing surfaces of the two resin components are respectively connected to the inner space. The outer peripheral region of the opposing surface of the first resin component has a peripheral groove that opens facing the second resin component and opens facing the first case member. On the other hand, on the outer peripheral area of the opposing surface of the second resin component, a protrusion that engages with the circumferential groove of the first resin component is projected, and the circumferential groove of the first resin component and the second resin component A housing structure for an electronic component, wherein the internal space is sealed by sandwiching the seal ring with a protruding rib.   The said 1st resin component and the 2nd resin component are respectively formed by injection-molding thermoplastic resin with respect to the inner surface of the surrounding wall of a 1st case member and a 2nd case member. Enclosure structure.   The housing structure according to claim 1, wherein the thermoplastic resin is a resin containing an olefin resin modified with an unsaturated carboxylic acid or a derivative thereof.

Images