JP5593780B2 - Housing structure - Google Patents

Description

  The present invention relates to a housing structure such as an electronic device in which a chassis and a cover are fitted via a packing.

  In the case of a portable device casing structure, a structure in which a chassis and a cover are fitted is generally used. At that time, as a measure against water and dust, a groove (undercut) is provided on the side surface of the chassis, and a packing made of an elastic material such as rubber is disposed there, so that sealing is often secured.

  In the conventional housing structure, the packing is compressed into the gap between the cover and the chassis by fitting the packing into the groove provided over the entire circumference of the chassis and covering the groove and packing from the outside. It has a structure that is arranged in the state.

  Further, as another housing structure, the convex portion provided on the entire circumference (circumferential end portion) of the end portion of the cover is engaged with the groove portion provided on the peripheral end portion of the chassis, and the convex portion and the groove portion are engaged. The packing disposed in the gap is compressed to ensure hermeticity (waterproof and dustproof) (see, for example, Patent Document 1).

JP 2004-286987 A JP 2001-251724 A

  In the conventional case structure, since the cover is easily deformed by the reaction force of the packing, not only the sealing performance of the device is impaired, but also the appearance and dimensional defects are caused. The deformation of the cover is larger at the center of the surface than at the corner. Therefore, in order to avoid deformation of the cover, it is necessary to increase the thickness of the cover. However, in portable devices, as represented by mobile phones, it is required to achieve both miniaturization / weight reduction and airtightness. However, in the conventional technology, if the cover is thinned for the purpose of miniaturization / lightening, it is hermetically sealed. It is difficult to achieve both of these because it impairs the performance.

  Moreover, unless the dimension of a groove part and a convex part is ensured with high precision, the location where packing is not compressed appropriately will generate | occur | produce and sealing performance will be impaired easily. If dimensional control is performed precisely in order to ensure sealing, the manufacturing cost will increase. Furthermore, even if the dimensions of the groove and the protrusion are ensured with high accuracy at the manufacturing stage, the portable device is highly likely to receive an impact on the housing even during normal use, and therefore the dimensional relationship between the groove and the protrusion is shifted. It is highly possible that the sealing will be impaired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to suppress deformation of the casing without increasing the thickness of the casing.

Chassis structure according to the present invention comprises a groove provided on the outer peripheral surface of the chassis, and a projecting portion provided on the edge of the chassis, and a re-Bed provided on the inner surface of the cover, the protrusion rib insert the housing the packing groove, has covered with a cover from the outer groove, a plurality of ribs are continuously arranged to form a comb-like ribs, arranging a plurality of projections facing the comb-like ribs It is characterized by that.

Since the present invention has a housing structure in which the protruding portion of the chassis enters the cover rib, the reaction force of the packing at the time of fitting is distributed over the entire rib provided on the inner surface of the cover, thereby increasing the thickness of the cover. Since the deformation can be suppressed without any problem, the size and weight of the housing can be reduced and the sealing performance can be improved. In addition, since the ribs are continuously arranged in a comb shape, it is possible to obtain an adhesion effect of the packing in an arbitrary section.

It is sectional drawing which shows the housing structure which concerns on Embodiment 1 of this invention. It is a perspective view which shows the housing | casing structure which concerns on Embodiment 1 of this invention. It is a perspective view which shows the cover of the housing | casing structure which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the housing | casing structure which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the housing structure which concerns on Embodiment 4 of this invention.

  An embodiment of a housing structure according to the present invention will be described with reference to the drawings. In the following drawings, the same reference numerals indicate the same or corresponding configurations. In addition, this invention is not limited to each embodiment shown below.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a housing structure according to Embodiment 1 of the present invention. FIG. 1A is a cross-sectional view showing the fitting between the cover and the chassis, and FIG. 1B is a cross-sectional view showing the fitting between the U-shaped rib and the protrusion. FIG. 2 is a perspective view showing a housing structure according to Embodiment 1 of the present invention. FIG. 2A is a perspective view showing the cover, and FIG. 2B is a perspective view showing the cover, packing, and chassis. A U-shaped rib 1 a is provided on the inner surface of the cover 1. The chassis 2 is provided with a protrusion 2 a at the edge, and a groove 2 b for accommodating the packing 3 on the outer peripheral surface. The protrusion 2a is disposed at a position facing the rib 1a.

  As shown in FIG. 2A, the rib 1a has a U-shape in a horizontal section. The cross-sectional shape of the rib 1a is not limited to the U-shape, and may be a U-shape, for example. Sealing is ensured by fitting the packing 3 into the groove 2b, pressing the packing 3 from the outside of the chassis 2, and covering the groove 2b and the packing 3 with the cover 1. At this time, the projecting portion 2a of the chassis 2 enters the rib 1a of the cover 1, so that the reaction force of the packing 3 at the time of fitting is not received only by the contact portion of the cover 1 with the packing 3, but the rib It will be received by 1a as a whole. The rib 1a functions as a mechanism that disperses the reaction force of the packing 3 and suppresses deformation of the cover 1 to the outside. Thereby, the deformation of the cover 1 can be suppressed without increasing the wall thickness of the cover 1, and the sealing performance is improved as well as the size and weight are reduced. Moreover, since the rib 1a and the projection part 2a are arrange | positioned inside a housing | casing, the problem on an external appearance does not arise.

  Also, if the cover 1 is a resin cover and the chassis 2 is a metal chassis (die-cast chassis) and the rigidity of the chassis 2 is higher than that of the cover 1, the rigidity of the protrusion 2a that receives the reaction force of the packing 3 from the rib 1a is high. Therefore, the deformation of the cover 1 can be further suppressed. The effects obtained by making the chassis 2 more rigid than the cover 1 are the same in the embodiments described below.

Embodiment 2. FIG.
In Embodiment 1, the U-shaped rib 1a is disposed inside the cover 1, but the shape of the rib is not limited to this. In the second embodiment, the ribs 1a are continuously arranged in a comb shape. FIG. 3 is a perspective view showing a cover of a housing structure according to Embodiment 2 of the present invention.

  Deformation due to the reaction force of the packing on the side surface of the cover 1 becomes more conspicuous in the surface center portion 1c than in the corner portion 1b. This is because the corner portion 1b absorbs the reaction force of the packing while the side 1d, which is a joint portion with an adjacent surface, does not have a portion that can absorb the reaction force of the packing. Any number of combinations of the U-shaped ribs 1a and the protrusions facing the ribs 1a can be arranged at arbitrary positions. For example, a U-shaped rib 1a may be disposed at the center of each of the four inner surfaces of the cover 1, or a plurality of U-shaped ribs 1a are continuously arranged to form a comb-shaped rib 1e. May be. In this case, a plurality of protrusions are also arranged on the chassis so as to face the comb-shaped rib 1e.

  Since the ribs are continuously arranged in a comb shape, an adhesion effect of packing can be obtained in an arbitrary section. For example, the ribs 1e are higher in the center portion 1c of the surface where deformation of the cover 1 becomes remarkable. Sealability can be secured. It is also possible to improve the hermeticity of the entire casing by disposing the comb-shaped rib 1e over the inner peripheral surface of the cover 1.

Embodiment 3 FIG.
In the first embodiment, the thickness of the U-shaped rib 1a and the protrusion 2a is uniform, but both may be tapered. FIG. 4 is a cross-sectional view showing a housing structure according to Embodiment 3 of the present invention. In the third embodiment, the U-shaped rib 1a disposed on the inner surface of the cover 1 and the protrusion 2a provided on the edge of the chassis 2 facing the rib 1a are respectively tapered. Here, an example is described in which the rib 1a and the protrusion 2a described in the first embodiment are tapered, but the comb-shaped rib 1e and the protrusion may be similarly tapered in the second embodiment. .

  By providing the taper, the tip of the protruding portion 2a is narrowed and the inlet of the rib 1a is widened, so that the cover 1 and the chassis 2 can be attached and detached more smoothly. Further, since the U-shaped rib 1a and the protruding portion 2a are arranged in parallel in the vertical direction, a certain amount of clearance is usually required to smoothly fit the cover 1 and the chassis 2 together. However, in the third embodiment, it is not necessary to consider the clearance by providing the U-shaped rib 1a and the protrusion 2a with a taper. For this reason, the rib 1a and the projection part 2a can be made to adhere more reliably, and airtightness can be improved.

Embodiment 4 FIG.
In the first embodiment, the protrusion 2 a is provided on the chassis 2, but the cover 1 may be provided with the protrusion 1 f. FIG. 5 is a cross-sectional view showing a housing structure according to Embodiment 4 of the present invention. When it is desired to improve the sealing performance over the entire circumference of the fitting portion of the housing, the comb-shaped rib 1e shown in the second embodiment may be arranged on the entire circumference (inner circumferential surface) of the inner surface of the cover 1. Conceivable. However, arranging a large number of ribs 1a and protrusions complicates the structure of the cover 1 and the chassis 2. In the fourth embodiment, the airtightness can be improved over the entire circumference of the fitting portion of the housing, though the structure is simple.

  In Embodiments 1 to 3, when the chassis 2 is formed of a metal chassis, a groove 2b is formed by providing a notch (undercut) for attaching the packing 3 to the outer peripheral surface. Providing the undercut is not preferable from the viewpoint of cost because the mold structure at the time of manufacture becomes complicated. In the fourth embodiment, the arrangement of the rib 1a on the inner surface of the cover 1 and the projection 2a of the chassis 2 shown in the first embodiment is reversed, and the groove 2b is formed on the entire circumference (periphery) of the edge of the metal chassis 2. The protrusion 1 f is provided on the peripheral edge of the cover 1. In the case of this structure, since it is not necessary to provide a groove on the outer peripheral surface of the metal chassis 2, it is not necessary to provide an undercut in the metal chassis 2, and the mold structure can be simplified.

  As shown in FIG. 5, a taper is provided on the inner surface of the protrusion 1f. This taper creates a gap between the inner peripheral surface of the groove 2b provided at the peripheral edge of the chassis 2 and the inner peripheral surface of the protrusion 1f fitted into the groove 2b. Since the packing 3 is accommodated in the gap and the protruding portion 1f is fitted into the groove 2b, the packing 3 is appropriately compressed and the sealing performance is improved.

1 Cover 1a Rib 1e Comb Rib 1f Protrusion 2 Chassis 2a Protrusion 2b Groove 3 Packing

Claims (3)

In the housing structure that fits the cover and chassis via packing,
A groove provided on the outer peripheral surface of the chassis;
A protrusion provided on an edge of the chassis;
A rib provided on the inner surface of the cover,
Inserting the protrusion into the rib,
Said accommodating the gasket in the groove, not covered with said groove from the outside by the cover,
A housing structure in which a plurality of the ribs are continuously arranged to form a comb-like rib, and a plurality of the projecting portions are arranged to face the comb-like rib . Chassis structure according to claim 1, characterized in that a taper and the comb-shaped ribs and said protrusions. The housing structure as claimed in claim 1 or claim 2, wherein the rigidity of the chassis is greater than the cover.

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