JPH09293972A - Compact electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make feasible of thinning and light weighting of a solid electronic device. SOLUTION: A substrate 3 mounted with an electronic component contained in a case body composed of a pair of plastic made outer shells 1, 2, divided into outside and inside. The honeycomb cores 4 are integrally molded of plastic in the parts away from the electronic component 13 on the inner surface of the outer shells 1, 2. Besides, recessions 5 encircled by stepped parts in the shape corresponding to the outer periphery of the honeycomb cores 4 are provided on the outside and inside of the substrate 3. In such a constitution, the outer shells 1, 2 are joined together with the front ends of respectively provided honeycomb cores 4 engaged with the recessions 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electronic device, and more particularly to a small electronic device such as a keyboard or a mobile phone which is covered with a thin plastic casing.

[0002]

2. Description of the Related Art As shown in FIG. 2, a housing of a conventional small electronic device has a pair of outer shells 1 divided into a front side and a back side of the device.
It is composed of 1 and 12. The circuit portion of the solid-state electronic device is composed of a substrate 14 on which electronic components 13 are mounted. The outer shells 11 and 12 have their peripheral edges aligned with each other to seal the inside. The base plate 14 is fixed to the outer shell 12 by screws (not shown). Plural pairs of bosses 14 and 15 are provided on the inner surfaces of the outer shells 11 and 12, respectively. Boss 1 of outer shell 12
The boss 1 of the outer shell 11 passes through the screw hole provided in the portion 5
The outer shells 11 and 12 are firmly fixed to each other by a screw 16 screwed into the portion 4 of FIG.

[0003]

In the case of the conventional small electronic device, the outer shells 11 and 12 are flat except for the peripheral edges.
The only part of the outer shells 11 and 12 that is resistant to deformation against external force is the peripheral portions of the outer shells 11 and 12, and the material itself of the outer shells 11 and 12 is required to have rigidity. Therefore, the thickness of the outer shells 11 and 12 can be reduced. Therefore, the distance from the outer surface of the housing to the mounted object such as the electronic component 13 is increased, and the thickness itself of the small electronic device needs to be increased. Also, the outer shell 11,1
2 and the substrate 14 must be fixed with a large number of screws. For example, in the case of a substantially rectangular planar shape, it is necessary to provide bosses at four corners and at least five places in the center of the housing and attach screws.

[0004]

A small electronic device according to the present invention comprises a board on which electronic components are mounted, a pair of housing outer shells attached to the front and back sides of the board, and a pair of housing outer shells, respectively. A honeycomb core having a tip abutting against the substrate provided on a portion of the inner surface away from the electronic component, and preferably the substrate is provided with a concave portion surrounded by a step having a shape corresponding to the outer periphery of the honeycomb core. The tip of the honeycomb core is fitted in the recess.

[0005]

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

FIG. 1A is a sectional view of a small electronic device according to an embodiment of the present invention, and FIG. 1B is an enlarged view of a part of this section.

The housing of the small electronic device shown in FIG. 1 is composed of a pair of outer shells 1 and 2 made of plastic which are divided into a front side and a back side.
The substrate 3 having the electronic component 13 mounted therein is housed therein. The honeycomb core 4 is integrally formed of plastic on the inner surfaces of the outer shells 1 and 2 except the electronic components 13. On the front surface and the back surface of the substrate 3, there are provided recesses 5 surrounded by steps having a shape corresponding to the outer periphery of the honeycomb core 4. Outer shells 1 and 2 are provided with honeycomb core 4 respectively
Are fitted to the concave portion 5 and are aligned with each other with the substrate 3 interposed therebetween.

Although not shown in the drawing, the outer shells 1 and 2 have a substantially rectangular plan shape, and the outer shells 1 and 2 are formed at two corners on one diagonal line.
A boss is provided on each inner surface, a screw passing through a hole provided in one boss of the outer shells 1 and 2 is screwed into the other boss to join the outer shells 1 and 2, and the substrate 3 is sandwiched between them. I am letting you.
Since the tip of the honeycomb core 4 is fitted into the recess 5 of the substrate 3 to bring out the positional relationship between the outer shells 1 and 2 and sandwich the substrate 3 between the outer shells 1 and 2, the conventional small electronic device like,
It is not necessary to fix the substrate 3 to the outer shell 2 with another screw in advance.

The means for connecting the outer shells 1 and 2 is not limited to screws, but other means, for example, an elastically deformable hook portion projecting on the inner surface of the outer shell 1, is locked to the outer shell 2 side. It may be something like.

[0010]

As described above, according to the present invention, since the honeycomb structure is provided on the inner surfaces of the pair of outer shells forming the casing of the solid electronic component, the bending strength of the casing is increased and the torsional rigidity is also increased. Assuming that the small electronic device has the same strength as the conventional one, the thickness of the outer shell can be reduced, and the distance from the outer surface of the outer shell to a mounted object such as an electronic component can be shortened. The small electronic device can be made thinner, and the weight can be further reduced.

Further, the number of screws for connecting the pair of outer shells can be reduced to about two, and by further fitting the tip of the honeycomb core into the recess provided in the substrate, the pair of outer shells can be assembled before the outer shells are assembled. There is no need to screw it to one of the outer shells.

[Brief description of drawings]

FIG. 1A is a sectional view of an embodiment of the present invention.
(B) is a figure which expands and shows a part of (A).

FIG. 2 is a cross-sectional view of a conventional small electronic device.

[Explanation of symbols]

 1 Outer Shell 2 Outer Shell 3 Substrate 4 Honeycomb Core 5 Recess 11 Outer Shell 12 Outer Shell 13 Electronic Component 14 Boss 15 Boss

Claims (2)

[Claims] 1. A board on which an electronic component is mounted, a pair of housing outer shells attached to the front and back sides of the board, and an inner surface of each of the pair of housing outer shells provided in a portion avoiding the electronic component. A compact electronic device, comprising: a honeycomb core whose tip is in contact with the substrate. 2. The small size according to claim 1, wherein the substrate is provided with a concave portion surrounded by a step having a shape corresponding to the outer periphery of the honeycomb core, and the tip of the honeycomb core is fitted in the concave portion. Electronic device.