JP2002135687A - Electronic equipment casing having opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently alleviate concentration of stress on an opening edge part in a casing with an opening. SOLUTION: The casing is constituted by forming plural columnar or wall- like projections, so as to be held linearly the opening edge part in the vicinity of the opening edge among inner surfaces of a surface wall, on which the opening is formed and constituted so that columnar projections 17a, 17b are abutted on electronic components, local deformation of the opening edge part 16 and the concentration of the stress is relieved, when the electronic components are excessively pressed on an opening edge rib 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for improving the strength of a corner of an opening in a housing of an electronic device having an opening.

[0002]

2. Description of the Related Art In general, a housing of an electronic device has an opening for exposing an electronic component supported therein to the outside. In many cases, the edge of the opening has a rib shape protruding inward of the electronic device in order to improve the strength. The electronic component is held in contact with the opening edge of the housing or at a slight distance for safety standards or external reasons.

However, the positional relationship between the mounting portion of the electronic component and the portion facing the edge of the opening depends on the manufacturing process of the electronic component,
There are variations due to various factors such as the assembly process of the electronic device or environmental conditions such as temperature. In the case where the electronic component and the opening edge of the exterior housing are scattered in a direction in which the electronic component is crimped, stress is concentrated on the opening edge corner of the housing when the electronic component is attached to the housing. Problems arise.

[0004] Details will be described using a television receiver as an example. FIG. 7 is a perspective view of the CRT viewed from the rear side. C
RT71 is an electron gun 72, a funnel unit 73, and a panel unit 74.
And a metal band 75 is wound around the panel portion 74. The metal band is provided with mounting brackets 76 for fixing the CRT at the four corners. The distance between the mounting bracket 76 of the CRT 71 and the front surface of the panel 74 has a variation of about 1 mm.

FIG. 8 is an enlarged perspective view of a corner portion of an opening edge of the housing of the television receiver, FIG. 9 is a rear view of the housing of the television receiver, and FIG. 10 is a cross section taken along a cross section DD shown in FIG. FIG. 11 is a view for explaining a cross-sectional shape before and after deformation when the CRT is excessively pressed, and FIG. 11 is a cross-sectional view taken along a cross section EE shown in FIG. 9 before and after deformation when the CRT is excessively pressed. FIG. 12 illustrates a cross-sectional shape. FIG.
FIG. 6 is a diagram illustrating a cross-sectional shape before and after deformation when a CRT is excessively pressed in a cross-sectional view cut along F. 3 to 5
In the figure showing the cross-sectional shape after the deformation, the deformation is shown in an enlarged manner in order to easily understand the change in the shape.

8 to 12, reference numeral 11 denotes a housing, 1
2 is a boss for attaching a CRT to the housing 11, and 13 is a CRT.
A rib for reinforcing the mounting boss 12, an opening edge rib orbiting around the opening edge of the housing 11, a contact surface 15 for contacting the CRT when an appropriate CRT is mounted on the housing 11, and a housing 16 Reference numeral 11 denotes an opening edge corner portion, and 74 denotes a CRT panel portion.

[0007] The television receiver has a rectangular opening formed in the housing 11 in order to expose the image surface of a CRT (cathode ray tube).
Have in front of. For this reason, when the mounting bracket of the CRT varies in the direction in which the front surface of the panel portion 74 and the housing opening edge rib 14 are pressed, the housing opening edge rib 14 is forcibly deformed.

[0010] As shown in FIG.
The position away from the opening is relatively flexible, and the opening edge rib 14 is deformed so as to open in the opening direction, thereby absorbing the forced displacement by the CRT panel 74. However, as shown in FIG. 12, the corner 16 of the opening edge of the housing has higher rigidity than the vicinity thereof, and the opening edge rib 14 cannot be opened in the opening direction. As a result, as shown in FIG. 12, a convex local deformation having the opening edge corner portion 16 as a vertex occurs. Due to the local deformation of the convex shape, a large stress concentration occurs at the edge portion 16 of the housing opening, which causes a problem of causing appearance defects such as cracks and whitening.

A conventional structure for reinforcing an opening edge of a housing will be described below by taking a television receiver as an example.

FIG. 13 shows an example of a conventional television receiver designed to reinforce the opening edge of the housing.
FIG. 4 is an enlarged perspective view of a corner portion of a housing opening edge. 13, reference numeral 11 denotes a housing, 12 denotes a boss for mounting the CRT to the housing 11, and 13 denotes a CRT mounting boss 1.
2, a rib for orbiting the opening edge of the housing 11, a contact surface 15 for contacting the CRT when an appropriate CRT is attached to the housing 11, and a rib 16 for the opening edge of the housing 11. The corner portion 131 is a thick portion provided to reinforce the corner portion of the opening edge.

As shown in FIG. 13, a part is thickened along the corner 16 of the opening edge to improve rigidity and reduce stress.

FIG. 14 shows an example of a structure for reinforcing the opening edge of a housing proposed in Japanese Patent Application Laid-Open No. Hei 7-355024.
FIG. 4 is an enlarged perspective view of a corner portion of a housing opening edge. In FIG. 14, reference numeral 11 denotes a housing, and 14 denotes a housing 11.
, An opening edge corner portion of the housing 11, 141 a contact piece that abuts the CRT panel portion, 142 a contact surface that makes the contact piece 141 continuous, and a contact surface with the CRT panel portion. 143 is a continuous rib that connects the contact piece 141 and the opening edge rib 14.

A large number of contact pieces 141 having a contact surface with the front surface of the panel portion 74 of the CRT are protruded at a position separated from the opening edge rib 14 of the housing 11, and further, a space between the contact pieces 141 is provided. A peripheral wall 142 having an abutting surface is formed so as to be continuous, and the abutting surface of the abutting piece 141 and the abutting surface of the peripheral wall 142 abut on the front surface of the panel portion 74 of the CRT, so that the opening edge rib 1 of the opening is provided.
Numeral 4 is such that it does not come into contact with the front surface of the panel section 74 of the CRT.

FIG. 15 shows an example c of a conventional television receiver which has been devised to absorb the variation in the distance between the mounting bracket of the CRT and the front surface of the panel of the CRT. It is an exploded perspective view of a part. In FIG. 15, reference numeral 11 denotes a housing, 12 denotes a boss for mounting the CRT to the housing 11, 13 denotes a rib for reinforcing the CRT mounting boss 12, 14 denotes a rib orbiting the opening edge of the housing 11, and 73 denotes a funnel. Reference numeral 74 denotes a CRT panel, 75 denotes a metal band, 76 denotes a mounting bracket, and 151 denotes an elastic spacer such as rubber.

By interposing an elastic spacer 151 such as rubber, for example, between the CRT mounting boss 12 of the housing 11 and the CRT mounting bracket 76, the distance between the CRT mounting bracket 76 and the front surface of the panel 74 can be reduced. Absorb the variation.

[0016]

However, the above-mentioned prior art has the following problems.

1) In the structure shown in Example a in which the thickness of the corner of the opening edge of the housing is thickened, the rigidity is locally improved, but the forced deformation caused by the pressing of an electronic component such as a CRT is prevented. The effect of suppression is small, and the stress value generated at the corner of the opening edge of the housing cannot be reduced. In addition, since it has an extremely uneven thickness structure, there is also a problem that appearance defects such as sink marks tend to occur.

2) The structure proposed in JP-B-7355024 shown in Example b has a problem that the appearance is not good because the opening edge of the housing is not in contact with an electronic component such as a CRT. In addition, since it is a complicated shape having a peripheral wall shape that goes around a position separated from the opening edge of the housing, there is a problem that costs and man-hours increase.

3) In the structure shown in Example c, in which an electronic component such as a CRT is mounted with an elastic spacer such as rubber interposed therebetween, there is a problem that the tightening force is reduced due to deterioration over time.
In addition, the number of parts and the number of work steps are increased, and the cost is increased.

[0020]

In order to solve the above-mentioned problems, a housing of an electronic device according to the present invention is characterized in that the opening edge corner is formed near an opening edge corner of an inner surface of a face wall in which an opening is formed. A plurality of pillar-shaped or wall-shaped projections are formed so as to be sandwiched linearly, and when the electronic component is excessively pressed, the projection comes into contact with the electronic component and the opening edge corner portion is formed. The local deformation is reduced, and the stress value at the corner of the opening edge can be reduced.

Further, since the stress value can be reduced by adding a slight projection, appearance defects such as sink marks are less likely to occur. In addition, since the shape can be greatly simplified as compared with the method proposed in Japanese Patent Application Laid-Open No. 7355024, costs and man-hours can be reduced.

Further, since most of the opening edge is in contact with the electronic device, a problem in appearance can be solved.

Further, in the housing of the electronic device according to the present invention, the strength between the plurality of protrusions can be improved with respect to a load in an in-plane direction of the face wall having the opening by connecting the plurality of protrusions. Buckling can be prevented, and the strength of the projection against a load in the compression direction can be improved.

Further, in the case of the electronic device according to the present invention, by making the protrusions and the opening edges continuous, buckling of the plurality of protrusions can be prevented, and the strength of the protrusions against a load in the compression direction can be improved.

[0025]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a housing of an electronic device according to an embodiment of the present invention. The description will be made using an example of a television receiver provided with a CRT.

(Embodiment 1) FIG. 1 is an enlarged perspective view of a corner of an opening edge of a housing of an electronic apparatus according to Embodiment 1 of the present invention, and FIG. 2 is an electronic apparatus according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view taken along the cross section AA shown in FIG. 2, showing a cross-sectional shape before and after deformation when the CRT is pressed excessively, and FIG. 4 is a cross-sectional view BB shown in FIG. FIG. 5 is a cross-sectional view taken along line and showing a cross-sectional shape before and after deformation when the CRT is pressed excessively. FIG. 5 is a cross-sectional view taken along the cross-section CC shown in FIG. 2 when the CRT is pressed excessively. It is a figure which shows the cross-sectional shape before and after deformation. In the drawings showing the cross-sectional shapes after the deformation in FIGS. 3 to 5, the deformation is shown in an enlarged manner in order to easily understand the change in the shape.

In FIGS. 1 to 5, reference numeral 11 denotes a housing;
Is a boss for mounting the CRT to the housing 11, 13 is a rib for reinforcing the CRT mounting boss 12, 14 is an opening edge rib orbiting the opening edge of the housing 11, and 15 is a proper CRT mounted on the housing 11. Abutment surface that contacts the CRT when the
The opening edge corners 17a and 17b are columnar projections provided to alleviate stress concentration at the opening edge corners. In FIGS. 3 to 5, reference numeral 74 denotes a front surface of the panel portion of the CRT.

As shown in FIG. 1, Embodiment 1 of the present invention
In the case of the electronic device shown in FIG. 1, two columnar projections 17a and 17b are provided on the inner surface of the surface wall where the opening of the case 11 is formed so as to sandwich the opening edge corner 16. When the distance between the front panel 74 of the CRT and the mounting bracket is as designed, there is no gap between the columnar projections 17a, 17b and the front 74 of the CRT panel, or there is a slight gap of about 0.1 mm. To be.

As shown in FIG. 3, the distance between the mounting bracket of the CRT and the front surface 74 of the panel varies, and
Are pressed excessively, the columnar protrusions 17a, 17
b comes into contact with the front surface 74 of the CRT panel, and the surface wall sandwiching the opening edge corner 16 is pushed up. As a result, as shown in FIG. 5, local convex deformation of the opening edge corner portion 16 can be reduced, and the stress value can be reduced.

As described above, the housing of the electronic device according to the first embodiment can reduce the stress concentration at the opening edge corner 16 by providing the two small columnar projections 17a and 17b. Further, since the added structure is small, it can be realized at low cost, and there is little possibility that molding defects such as sink marks occur.

(Embodiment 2) FIG. 6 is an enlarged perspective view of a corner portion of an opening edge in a housing of an electronic apparatus according to Embodiment 2 of the present invention.

In FIG. 6, reference numeral 11 denotes a housing, and 12 denotes a CR.
A boss for attaching T to the housing 11, a rib 13 for reinforcing the CRT mounting boss 12, a rib 14 around the opening edge of the housing 11, and a reference numeral 15 when a proper CRT is attached to the housing 11. A contact surface that contacts the CRT, 16 is an opening edge corner of the housing 11, and 61 is a rib provided to reduce stress concentration at the opening edge corner 16.

When the CRT is pressed excessively, the reinforcing ribs 61 contact the contact portions 62a, 62 which come into contact with the front surface of the CRT panel.
2b and a continuous rib 63 continuous between the contact portions 62a and 62b, and continuous ribs 64a and 64b continuous between the contact portions 62a and 62b and the opening edge rib 14.

As shown in FIG. 6, contact portions 62a and 62b are provided on the inner surface of the face wall where the opening of the housing 11 is formed so as to sandwich the opening corner 16 and the contact portions 62a and 62b are provided.
The reinforcing rib 61 is formed so as to be continuous between the contact ribs 2b and the contact portions 62a and 62b and the opening edge rib 14.

When the front surface of the CRT panel is excessively pressed against the opening edge rib 14, the contact portions 62a and 62b come into contact with the front surface of the CRT panel portion to push up the surface wall sandwiching the opening edge corner portion 16, Local convex deformation can be reduced. Thereby, the stress value of the opening edge corner portion 16 can be reduced.

Further, by connecting the contact portions 62a and 62b with a continuous rib 63 and connecting the contact portions 62a and 62b and the opening edge rib 14 with continuous ribs 64a and 64b,
The strength against the compressive load of the contact portions 62a and 62b can be improved, and the strength against the load in the plane where the opening of the housing 11 is formed can be improved.

[0037]

The housing of the electronic device according to the present invention is provided with a columnar or wall-shaped projection near the opening edge of the housing so as to linearly sandwich the opening edge. The stress value at the corner of the opening edge of the housing can be reduced.

Further, since the structure formed on the inner surface of the housing is simple and minute, the appearance defect such as sink marks is unlikely to occur, and the increase in cost and man-hour can be minimized.

Further, the ribs are formed by connecting the projections or the projections and the opening edge ribs continuously.
The strength against the load in the plane where the opening of the housing is formed can also be improved.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a housing of the television receiver according to Embodiment 1 of the present invention, showing a corner of an opening edge.

FIG. 2 is a housing of the television receiver according to Embodiment 1 of the present invention, which is a rear view of a corner portion of an opening edge.

FIG. 3 is a cross-sectional view of the housing of the television receiver according to the first embodiment of the present invention, taken along a cross section AA in FIG. 2 and showing a cross section before and after deformation when a CRT is excessively pressed; Diagram explaining the shape

4 is a cross-sectional view of the housing of the television receiver according to Embodiment 1 of the present invention, taken along a cross section BB in FIG. 2, and showing a cross section before and after deformation when a CRT is pressed excessively. Diagram explaining the shape

5 is a cross-sectional view of the housing of the television receiver according to the first embodiment of the present invention, taken along a cross section CC in FIG. 2 and showing a cross section before and after deformation when a CRT is pressed excessively. Diagram explaining the shape

FIG. 6 is an enlarged perspective view of a housing of the television receiver according to Embodiment 2 of the present invention, showing a corner portion of an opening edge.

FIG. 7 is a perspective view of the CRT viewed from the rear side.

FIG. 8 is an enlarged perspective view of a corner of an opening edge of a housing of a conventional television receiver.

FIG. 9 is a rear view of a corner of an opening edge of a housing of a conventional television receiver.

FIG. 10 shows a housing of a conventional television receiver,
FIG. 10 is a cross-sectional view taken along a cross-section DD in FIG. 9, illustrating a cross-sectional shape before and after deformation when a CRT is excessively pressed.

FIG. 11 is a housing of a conventional television receiver,
FIG. 10 is a cross-sectional view taken along a cross section EE in FIG. 9, illustrating a cross-sectional shape before and after deformation when a CRT is excessively pressed.

FIG. 12 shows a housing of a conventional television receiver,
FIG. 10 is a cross-sectional view taken along a cross-section FF in FIG. 9, illustrating a cross-sectional shape before and after deformation when a CRT is excessively pressed.

FIG. 13 is a diagram showing Example a of the related art, and is an enlarged perspective view of a corner of an opening edge of a television receiver housing.

FIG. 14 is a diagram showing Example b of the related art, and is an enlarged perspective view of a corner of an opening edge of a television receiver housing.

FIG. 15 is an exploded perspective view of a CRT mounting portion of a television receiver housing, showing a prior art example c.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Housing 12 CRT mounting boss 13 CRT mounting boss reinforcement rib 14 Opening edge rib 15 Contact surface 16 Opening edge corner 17a, 17b Columnar protrusion 61 Reinforcement rib 62a, 62b Contact portion 63 Continuous rib 64a, 64b Continuous rib 71 CRT 72 electron gun 73 funnel part 74 panel part 75 metal band 76 mounting bracket 131 thick part 141 contact piece 142 peripheral wall 143 continuous rib 151 spacer (elastic body)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomio Shioda 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5G435 BB02 EE02 LL04

Claims (4)

[Claims] 1. A housing for housing electronic components,
A housing having a corner opening for exposing a part of the electronic component to the outside, and having a rib shape protruding inward of the electronic device at an opening edge of the opening; Around the inner edge of the opening edge of the inner surface of the face wall having a plurality of columnar or wall-shaped projections linearly sandwiching the opening edge corner, the electronic component is pressed excessively. When the protrusion comes into contact with the electronic component,
A housing for an electronic device, wherein stress concentration due to local deformation of the corner of the opening edge is reduced. 2. The housing for an electronic device according to claim 1, wherein a space between the plurality of projections is continuous. 3. The housing of an electronic device according to claim 1, wherein a space between the plurality of protrusions and the opening edge is continuous. 4. The housing for an electronic device according to claim 1, wherein said electronic component is a cathode ray tube (CRT).