JP2012114663A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely suppress the effect of static electricity that enters a case, without discouraging decrease in size and reduction in thickness of an electronic apparatus.SOLUTION: A through hole 17 that penetrates a body case 11A is formed at a part of a step part 15 formed over the entire outer periphery of an opening part 13 of the body case 11A. A projection 23 that protrudes toward the inside of the through hole 17 is formed at a cover wall part 22b of an inner case 22. When static electricity tries to enter a gap S between the outer peripheral part of a cover 14 and the display case 11A, the static electricity passes between the cover 14 and the step part 15. At this time, since the projection 23 provided to the inner case 22 is positioned at such a point where the cover 14 and the step part 15 face each other, the static electricity that has entered passes the inner case 22 from the projection 23 and then is guided to the ground on an electronic circuit board 20.

Description

  The present invention relates to various electronic devices including a portable telephone terminal.

In various types of portable electronic devices such as mobile phones, a panel that transmits light to the surface of the housing in order to provide a liquid crystal display unit, LED light emitting unit, camera sensor, infrared sensor, etc. More and more are provided.
In addition, since electronic devices are always required to be thin, there are cases in which escape holes are provided in the housing in order to avoid interference with internal components, or through holes are formed in the housing due to the mold structure. In such a case, as shown in FIG. 3, a configuration is often adopted in which the opening 2 of the escape hole or the through hole formed in the housing 1 is closed with an exterior cover 3.

  However, if the opening 2 is provided in the housing 1, static electricity or the like easily enters the housing 1 through the gap between the opening 2 and the cover 3. If static electricity or the like enters the housing 1, the internal electronic component 4 may be functionally damaged. In FIG. 3, reference numeral 5 denotes an electronic circuit board, 6 denotes a shield case for shielding electromagnetic noise, and 7 denotes a double-sided tape for fixing the cover 3 to the opening 2.

  Therefore, as a countermeasure against static electricity that enters the housing, for example, as shown in Patent Document 1 and FIG. 4, an electronic component 4 provided in the housing 1 from the mating surface of the opening 2 and the cover 3 of the housing 1. There is a method of ensuring the creepage distance L as long as possible.

  Further, as shown in Patent Document 2 and FIG. 5, a ground member 8 grounded to the ground is provided between an intrusion portion of static electricity, that is, a joint surface between the opening 2 of the casing and the cover 3 and the electronic component 4. There is also a method to provide.

Furthermore, as shown in FIG. 6, there is also a method of providing a shielding member 9 made of a conductive material between the opening 2 and the electronic component 4 so as to close the opening 2.
In addition to this, there is a method of arranging a varistor in the electronic circuit in the housing 1.

JP 2008-182607 A JP 2010-154221 A

However, since both methods require a certain amount of space for taking countermeasures, further improvements have been demanded in electronic devices where miniaturization and thinning are important.
Accordingly, an object of the present invention is to provide an electronic device that can surely suppress the influence of static electricity that enters the housing without hindering miniaturization and thinning.

The present invention employs the following means in order to solve the above problems.
That is, the electronic machine of the present invention has an electronic circuit board built therein, a housing in which an opening is formed in a part thereof, an electronic component mounted on the electronic circuit board, and an outer peripheral side of the electronic component, A shield case made of a conductive material grounded to a ground; and a cover for closing the opening formed in the housing. The housing has a through-hole that faces the mating surface of the cover and the housing around the opening. And a projection inserted into the through hole is formed integrally with the shield case.

  According to the present invention, since the projection formed on the shield case faces the mating surface of the cover and the casing, the static electricity that has attempted to enter from the mating surface of the cover and the casing can be prevented via the shield case. To the ground. Thereby, the influence by the static electricity which penetrate | invades in a housing can be suppressed reliably. In addition, since it is only necessary to provide a projection on the shield case, it is not necessary to provide a special member or the like, and it does not hinder the downsizing and thinning of the electronic device.

It is a perspective view which shows the external appearance of the mobile telephone terminal which concerns on this embodiment. It is sectional drawing of the telephone terminal shown in FIG. It is sectional drawing which shows an example of the conventional mobile telephone terminal. It is sectional drawing which shows another example of the conventional mobile telephone terminal. It is sectional drawing which shows another example of the conventional mobile telephone terminal. It is sectional drawing which shows the example of the conventional mobile telephone terminal.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out an electronic apparatus according to the present invention will be described below with reference to the accompanying drawings. However, the present invention is not limited only to these examples.

FIG. 1 is a perspective view showing a mobile phone terminal (electronic device) 10 as an example of an electronic device to which the present invention is applied.
As shown in FIG. 1, the mobile phone terminal 10 includes a display housing (housing) 11 </ b> A having a monitor unit for displaying various information such as images, characters, and images, and a user operating the mobile phone terminal 10. And a main body casing 11B provided with the operation keys.
The display housing 11 </ b> A and the main body housing 11 </ b> B are rotatably connected to each other by a hinge portion 12 and can be folded and unfolded.

  Here, for example, the display housing 11A has an opening 13 formed on the surface facing outward in the state where the display housing 11A and the main body housing 11B are folded. A cover 14 made of a resin having properties is provided.

  As shown in FIG. 2, an electronic circuit board 20 is built in the display housing 11A. On one surface side of the electronic circuit board 20, a liquid crystal display device 21 is mounted at a position facing the opening 13. The liquid crystal display device 21 can display information such as characters and images, and the information is transmitted through the cover 14 so that the user can visually recognize it from the outside.

  Further, in the electronic circuit board 20, an inner case (shield case) 22 made of a conductive material such as metal is provided on the outer peripheral side of the liquid crystal display device 21 as a shield for preventing leakage and intrusion of electromagnetic noise. ing. The inner case 22 is proximate to the rising wall portion 22a extending from the outer peripheral portion of the electronic circuit board 20 in a direction orthogonal to the surface of the electronic circuit board 20, and the liquid crystal display device 21 on the inner peripheral side from the tip of the rising wall portion 22a. A cover wall portion 22b extending in parallel with the electronic circuit board 20 is formed integrally with the electronic circuit board 20 and the rising wall section 22a is grounded to the ground of the electronic circuit board 20.

  The display housing 11A has a step portion 15 that is recessed around the opening 13 toward the electronic circuit board 20 with respect to the outer surface 11s of the display housing 11A. The cover 14 is fixed on the step portion 15 by a fixing means such as a double-sided tape 16, so that the surface 14s of the cover 14 is continuous with the outer surface 11s of the display housing 11A. In addition, it is preferable to provide the double-sided tape 16 so that the perimeter of the opening part 13 may be enclosed, and, thereby, a waterproof and dustproof function can be improved.

In a part of the step portion 15 formed over the entire outer periphery of the opening portion 13, a through-hole 17 penetrating the inside and outside of the main body housing 11 </ b> A is formed at a position facing the mating surface of the cover 14 and the step portion 15. ing.
On the other hand, a projection 23 is formed on the cover wall portion 22 b of the inner case 22 so as to project into the through hole 17. It is preferable that the protrusion 23 is formed so that the tip end portion 23 a thereof is substantially flush with the surface of the step portion 15, or protrudes toward the cover 14 from the step portion 15.

  In the mobile phone terminal 10 having such a configuration, when static electricity enters the gap S between the outer peripheral portion of the cover 14 and the display housing 11A, the static electricity passes through the mating surface of the cover 14 and the step portion 15. Become. At this time, a projection 23 provided on the inner case 22 is located on the mating surface of the cover 14 and the stepped portion 15, and the inner case 22 is grounded. Is passed through the inner case 22 and led to the ground of the electronic circuit board 20.

Therefore, it is possible to avoid external static electricity from reaching the liquid crystal display device 21 and other electronic components mounted on the electronic circuit board 20, and adversely affect these liquid crystal display devices and electronic components. This can be prevented.
In addition, since it is only necessary to provide the protrusion 23 on the inner case 22 that has been conventionally provided, there is no need for a space to take measures against static electricity, and this prevents the mobile phone terminal 10 from being reduced in size and thickness. Therefore, an effective effect can be obtained at low cost.
Moreover, since the protrusion 23 is located on the mating surface of the cover 14 and the main body casing 11A, static electricity that has entered from the outside can be quickly eliminated, and the above-described effect becomes even more remarkable.

  The protrusions 23 and the through holes 17 may be formed continuously over substantially the entire circumference of the outer periphery of the opening 13. Thereby, an effect can be effectively exhibited with respect to the static electricity which penetrates from arbitrary directions.

(Other embodiments)
The electronic apparatus of the present invention is not limited to the above-described embodiments described with reference to the drawings, and various modifications can be considered within the technical scope.
For example, in addition to the configuration shown in the above embodiment, as shown in FIG. 1, a conductive film 30 may be provided on the back side of the cover 14 so as to be continuous with the entire outer periphery of the cover 14. The conductive film 30 is provided so as to abut against or be close to the protrusion 23 of the inner case 22 in a state where the cover 14 is mounted on the main body casing 11A.
By adopting such a configuration, the static electricity that has entered from the outside can be guided to the ground of the electronic circuit board 20 through the conductive film 30, the protrusion 23, and the inner case 22 over the entire circumference of the cover 14. Intrusion countermeasures can be made more effective.

Furthermore, the conductive film 30 can be configured by forming the base material of the double-sided tape 16 with a tape-like conductive material. That is, for example, a double-sided tape 16 in which an adhesive (adhesive) is applied to both sides of a tape-like base material made of a conductive material such as a metal thin film is used. It is provided so as to be in contact with 23 or close to it. Thereby, the double-sided tape 16 can be provided with both the fixing function of the cover 14 and the anti-static intrusion countermeasure function.
Thereby, the protrusion 23 and the through-hole 17 should just be provided in dot shape in a part of the circumferential direction of the opening part 13, and can raise the freedom degree of the installation position.

Further, the liquid crystal display device 21 is provided so as to face the opening 13, but the present invention is not limited to this, and the present invention can be similarly applied to other devices such as operation keys. . In that case, the material of the cover 14 can be the same as that of the main body housing 11A, or can be appropriately made of other materials.
Furthermore, it goes without saying that the present invention can be similarly applied to various electronic devices other than the mobile phone terminal 10.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

10 Mobile phone terminals (electronic devices)
11A Display housing (housing)
11B Main body housing 11s Outer surface 12 Hinge portion 13 Opening portion 14 Cover 14s Surface 15 Step portion 16 Double-sided tape 17 Through hole 20 Electronic circuit board 21 Liquid crystal display device 22 Inner case (shield case)
22a Standing wall portion 22b Cover wall portion 23 Projection 23a Tip portion 30 Conductive film

Claims (2)

A housing containing an electronic circuit board and having an opening formed in a part thereof,
An electronic component mounted on the electronic circuit board;
A shield case made of a conductive material provided on the outer peripheral side of the electronic component and grounded to the ground;
A cover for closing the opening formed in the housing,
The casing is formed with a through-hole facing the mating surface of the cover and the casing around the opening.
An electronic apparatus, wherein the shield case is integrally formed with a protrusion to be inserted into the through hole. On the mating surface of the cover and the housing, a strip-shaped conductive portion made of a conductive material continuous over the entire circumference of the cover is provided,
The electronic device according to claim 1, wherein the conductive portion is in contact with or close to the protrusion.

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