JP5287661B2 - Case warp correction structure for mobile devices - Google Patents

Description

  The present invention relates to a housing warp correction structure for a mobile terminal, and more particularly to a housing warp correction structure for a mobile terminal incorporating a display device.

  A display device for a portable terminal such as a mobile phone or a portable personal computer typically includes a member in which a substrate is further bonded to a liquid crystal display unit that is reinforced by being inserted into an internal frame for reinforcing strength, a sheet metal for an exterior, and a resin casing. It has a structure in which a member obtained by laminating a transparent polarizing plate (screen) on an exterior resin casing composed of a body part is superposed.

  4 to 6 schematically show an example of a housing structure of a conventional mobile phone display device. FIG. 4 shows a structure in which a liquid crystal display unit (hereinafter also referred to as “LCD unit”) 12 reinforced by an internal frame 11 and an exterior resin casing 10 composed of an exterior sheet metal and a resin casing portion are overlapped. . FIG. 5 is a plan view of the exterior resin casing 10 including a sheet metal for exterior and a resin casing, and FIG. 6 is a partial cross-sectional view taken along line AA of FIG.

  As described above, in the portable terminal, the LCD unit is reinforced with the internal frame as the device is thinned and miniaturized, and the resin casing and the reinforcing sheet metal are molded together (hereinafter referred to as insert molding). ) Is used to compensate for strength deterioration due to thinning and miniaturization.

  Patent Document 1 discloses a fitting structure between a cover and a structure that suppresses warping of a cover of an electronic device such as a mobile phone. Patent Document 2 discloses a structure in which a fitting claw and a lateral rib are provided on the front panel and a recess and a front rib are provided on the base to correct the warpage of the front panel of the information processing apparatus, and both are fitted. ing.

JP 2006-86279 A JP-A-4-224308

  If an insert molding technique is used to manufacture an exterior resin casing of a mobile terminal, the resin casing section warps outward due to the difference in shrinkage between the resin and the exterior sheet metal during insert molding. That is, when the resin hardens, the resin shrinks, but the sheet metal does not shrink, so that there is a problem that the resin casing is warped. Conventionally, the process which fills the clearance gap which generate | occur | produced between the other parts with respect to the curved resin housing | casing part was performed. In addition, since the shape is complicated, the amount of warpage cannot be estimated in advance, and the gap filling process was performed after the molding conditions were determined, so that it took a very long time to cope.

  Moreover, in the prior art shown in patent document 1 and patent document 2, since the structure of the joint part of two members to be combined is fitted as a special structure, extra strength is required for the member, and the fitting structure becomes complicated. Tend to. An object of the present invention is to effectively correct the warp of the mobile terminal housing with a simple structure.

In a first aspect, a case for correcting a case warpage of a portable terminal according to the present invention includes a liquid crystal display unit reinforced with an exterior resin casing composed of at least a sheet metal for exterior and a resin casing, and an internal frame for reinforcement. including the door, a housing warp correction structure for a display device a portable terminal, at least a portion of the reinforcing inner frame of said liquid crystal display unit, and the resin casing and the fitting of the outer instrumentation resin casing, wherein A part of the reinforcing inner frame of the liquid crystal display unit has a convex part, and the resin casing part of the exterior resin casing has a concave part at a position corresponding to the convex part. The convex shape portion of the reinforcing internal frame and the concave shape portion of the resin casing portion are fitted, and the convex shape portion is bent in a crank shape .

  In a second aspect, the mobile terminal display device according to the present invention has the above-described case warp correction structure.

  With the correction structure according to the present invention, it is possible to effectively correct the warp of the mobile terminal housing with a simple structure.

It is the schematic which shows the fitting state of the convex-shaped part which is 1st Example of the curvature correction structure which concerns on this invention, and a concave-shaped part. It is the schematic which shows the fitting state of the convex shape part which is the 2nd Example of the curvature correction structure which concerns on this invention, and a concave shape part. They are the bird's-eye view (A) which shows one Example of the position of a convex-shaped part and a concave-shaped part in the curvature correction structure which concerns on this invention, and its partial enlarged view (B). It is a bird's-eye view which shows superposition of a liquid crystal display unit and an exterior resin case in the conventional portable terminal case. In the conventional portable terminal housing | casing, it is the top view which showed the main direction where an exterior resin housing | casing warps at the time of insert molding. It is the schematic of the AA cross section of FIG.

  The convex shape part is formed in a direction in which the liquid crystal display unit is overlapped with the exterior resin casing of a part of the reinforcing inner frame, and the concave shape part is a part of the resin casing part, It is preferable that the liquid crystal display unit is formed in a portion extending in a direction orthogonal to a direction in which the liquid crystal display unit is superimposed on the exterior resin casing.

  In addition, it is preferable that the crank-shaped convex portion is in contact with two surfaces of the resin casing portion to correct warpage in two directions of the resin casing portion.

  Next, an embodiment of the present invention will be described with reference to the drawings, taking a liquid crystal display device of a mobile phone as an example.

  In the conventional liquid crystal display casing structure, it is known that the resin casing portion of the exterior resin casing warps (deforms) in various shapes depending on its form. The warp that the whole body part moves outward is large.

  FIG. 4 is a bird's-eye view showing a schematic structure of a conventional liquid crystal display housing. FIG. 4 shows a structure in which a liquid crystal display unit (LCD unit) 12 reinforced by an internal frame 11 for reinforcing strength and an exterior resin casing 10 are overlapped.

  FIG. 5 is a plan view of a conventional exterior resin casing 10. In FIG. 5, the problem is that the left and right side portions of the figure warp in the outer direction (left and right directions indicated by arrows in the figure). FIG. 6 shows a schematic diagram of the AA cross section of FIG. As shown in FIG. 6, the LCD unit 12 including the substrate 13 and the LCD reinforced by the internal frame 11 is an exterior resin composed of an exterior sheet metal 1, a resin casing 2, and a transparent polarizing plate (screen) 3. The internal frame 11 and the resin casing 2 are not fitted to each other only by being overlapped with the casing 10.

Example 1
In the present embodiment, as shown in FIG. 1, a part of the end of the inner frame 11 for reinforcing the LCD unit is extended to form a convex portion (protrusion portion) 4, and the resin housing portion of the exterior resin housing 10. 2 so that it can be fitted into the concave portion (hole) 14 provided in FIG. By doing so, the entire resin casing 2 moves in the outward direction (rightward in FIG. 6) by the convex portion 4 of the internal frame 11, and the deformation is corrected.

  In addition, as shown in FIG. 1, the concave-shaped part 14 is a part which extended a part of resin housing part 2 to the horizontal direction (direction orthogonal to the direction which overlaps the internal frame 11 on the exterior resin housing | casing 10). It is preferable to provide it. And it is preferable to form the convex-shaped part 4 in the direction which overlaps the internal frame 11 with the exterior resin housing | casing 10. FIG. By doing so, the convex portion 4 and the concave portion 14 are fitted only by superimposing the inner frame 11 on the exterior resin casing 10, and the assembly process of the casing having the correction structure according to the present invention. Becomes easy.

  Thus, the rigidity of the internal frame 11 is added by fitting the convex shape portion 4 of the reinforcing internal frame 11 having rigidity originally into the concave shape portion 14 of the resin casing portion 2, and the entire portable terminal case The effect of increasing the rigidity can be expected.

  FIG. 3 shows an arrangement example of the convex portion 4 provided on the inner frame 11 of the LCD unit 12 and the concave portion 14 provided on the resin casing portion 2 of the exterior resin casing 10. The concave portion 14 is shown in an enlarged view (B) of the elliptical dotted line portion. Although it is somewhat difficult to see in the drawing, the bottom portion of the notch shown in the ellipse in the enlarged view (B) forms a hole, which is a concave portion. In addition, although the convex-shaped part 4 has shown the thing in the near side of the internal frame 11 with the dotted line, there exists a similar convex-shaped part also in the side surface of a facing side (it is not shown in figure since it is not visible), and shows in an elliptical dotted line part The concave shape portion 14 corresponds to the convex shape portion on the facing side surface. (The concave part on the front side is hidden and cannot be seen.)

  In general, a metal such as a sheet metal is preferably used as the material of the inner frame 11, but it is not necessarily made of metal as long as it has a required rigidity. Moreover, the shape of the convex-shaped part 4 and the concave-shaped part 14 should just be a combination of the shape which can be fitted mutually, and is not specifically limited.

  Moreover, the number and position of the convex-shaped part 4 and the concave-shaped part 14 are not specifically limited, either can be suitably set by those skilled in the art depending on the structure of the casing, the necessary degree of correction, and the reinforcing strength. Note that FIG. 3 shows an example in which convex and concave portions 4 and 14 that are fitted to each other are provided at two locations on one side surface.

(Example 2)
Moreover, it is also possible to make it the structure which bent the convex-shaped part 4 which extended the edge part of the internal frame 11 in the crank shape like FIG. 2, without extending straightly. This is effective, for example, when the concave shape portion 14 of the resin casing portion 2 cannot be disposed at a position where the end portion of the internal frame 11 is extended straight due to restrictions on the internal structure.

  In the case of the bent structure as described above, a portion parallel to the LCD unit (a horizontal portion in FIG. 2) is provided in the bent portion, and the resin casing portion 2 is pressed by being brought into contact with the resin casing portion 2. In addition to correcting the warping in the outer (right side in FIG. 6) direction, the warping in the upward direction may be suppressed.

  The present invention has been described with reference to the above embodiment, but the present invention is not limited only to the configuration of the above embodiment, and various modifications that can be made by those skilled in the art within the scope of the present invention. Of course, including modifications.

1 Sheet metal for exterior 2 Resin casing 3 Transparent polarizing plate (screen)
4 Convex part (protrusion part)
DESCRIPTION OF SYMBOLS 10 Exterior resin housing | casing 11 Internal frame 12 LCD unit 13 Board | substrate 14 Concave shape part (hole part)

Claims (4)

A casing warp correction structure for a display device for a mobile terminal, including an exterior resin casing composed of at least an exterior sheet metal and a resin casing, and a liquid crystal display unit reinforced with an internal frame for reinforcement,
At least a portion of the reinforcing inner frame of said liquid crystal display unit, and the resin casing and the fitting of the outer instrumentation plastic housing,
A part of the reinforcing inner frame of the liquid crystal display unit has a convex portion, and the resin casing portion of the exterior resin casing has a concave portion at a position corresponding to the convex portion. The convex shape portion of the reinforcing inner frame and the concave shape portion of the resin casing portion are fitted,
The case warp correction structure, wherein the convex portion is bent in a crank shape . The convex portion is formed in a direction in which the liquid crystal display unit is overlapped with the exterior resin casing of a part of the reinforcing inner frame,
The concave-shaped portion is formed in a portion where a part of the resin casing portion extends in a direction orthogonal to a direction in which the liquid crystal display unit is superimposed on the exterior resin casing. The housing warp correction structure according to claim 1 . The crank-like convex portion, by contacting the two surfaces of the resin casing, characterized by correcting the two directions of the warp of the resin casing, according to claim 1 or 2 Case warp correction structure. A display device for a portable terminal, comprising the casing warp correction structure according to any one of claims 1 to 3 .

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