JPH07307779A - Mobile phone shield structure - Google Patents

Abstract

(57) [Abstract] [Purpose] A mobile phone capable of cost reduction, which does not adversely affect the built-in electronic device by the local station transmission wave radiated from the antenna and does not generate interference waves to the outside. To realize the shield structure of. [Structure] An upper surface of a key rubber sheet 12a of a keypad 12 is covered with a metal sheet 14, both ends 14a, 14a are folded back and brought into contact with a ground earth portion 13a of a key board 13. As a result, the stacked key substrate 13 and metal sheet 14 are pressed and fixed by the claw portions 11a to 11c protruding from the upper cover 11 that is conductively coated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure for shielding unwanted radiated radio waves inside and outside a device of a mobile phone, and in particular, to prevent adverse effects on internal electric parts by a transmission wave of its own station from its own antenna. The present invention relates to a shield structure of a mobile phone.

[0002]

2. Description of the Related Art Conventionally, in order to make the portable telephone device of this kind lighter, thinner, shorter and smaller, a multi-layered substrate having a strengthened earth shield is used as a key substrate opposed to a keypad, and a cover and a ground of the key substrate are used. -Screw fixing means were used to strengthen the earth contact.

[0003]

In the conventional mobile phone, even if the inner surface of the cover is coated with conductive material as shown in FIG. 7, the transmitted wave radiated from the antenna passes from the button 3a of the keypad. And, since it has a bad influence on the electric parts inside, the effect cannot be expected. For this reason, a multi-layered board with a strengthened earth shield is adopted as a key board, and in order to strengthen the ground earth connection between the cover and the key board, as shown in FIGS. There is a problem that it becomes necessary and expensive.

[0004]

In the shield structure for a mobile phone of the present invention, a metal sheet is provided to cover the upper surface of the key rubber sheet of the dial section of the telephone section, and the edges are folded back to form the ground ground of the key board. It is joined to the above-mentioned part, and is fixed by pressure contact by a claw part protruding from the upper cover.

[0005]

[Function] Since the upper surface of the key rubber sheet is covered with a metal sheet, the folded portion of the metal sheet is brought into contact with the earth pattern of the key substrate, and then the contact is fixed by pressure with the claw portion of the upper cover on which conductive coating is applied. Good electrical contact can be obtained between the metal sheet and the ground ground portion of the key board.

As a result, since the key rubber sheet is covered with the metal sheet except for the buttons, the mounted electric parts such as electric circuits inside the key board are shielded from electromagnetic waves and the like. Therefore, it is possible to prevent the adverse effect of the transmitted wave of the own station on the electric parts, and it is not necessary to use an expensive multilayer board with a strengthened earth shield for the key board.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an embodiment showing a shield structure of a mobile phone according to the present invention, and is a perspective view of an essential part showing the inside of a phone part built in an upper cover of the mobile phone. 2A is a sectional view taken along line BB of FIG.
FIG. 2B is an enlarged detailed view of a C portion of FIG. Figure 1,
2, the upper cover 11 is molded by plastic,
A conductive coating is applied to the inner surface. 11a to 11c are claws inside the cover 11, and 11d is a stopper. Reference numeral 12 denotes a keypad, which includes a key rubber sheet 12a and a plurality of key buttons 12b integrally arranged on the upper surface of the key rubber sheet 12a, and a pattern portion (not shown) opposed to a contact portion (not shown) of the button 12b. The key substrate 13 having the key) is in contact with the key rubber sheet 12a. Incidentally, 13a is a ground earth provided on the lower surface of the key board 13. The upper surface of the key rubber sheet 12a is covered with the metal sheet 14, and both end sides 14a, 14a of the metal sheet 14 are folded back to the opposite surface of the key rubber sheet 12a, and the inner surface of the upper cover 11 is covered. Standing claws 11a, 11b,
11c (the outer surface of which is provided with a conductive coating) is pressed and fixed to the ground ground 13a. Therefore, good electrical contact can be obtained between the key board 13 and the metal sheet 14, and the electric components below the key board 13 are electromagnetically shielded from the outside. As a result, even if the own station's transmission wave from the antenna 4 (see FIG. 7) is radiated in the direction of the arrow, there is no risk of adversely affecting the electronic circuits of the radio unit and control unit that are shielded and arranged below. Further, it is not necessary to use a multi-layer substrate having a strengthened earth shield, and fixing with screws is also unnecessary.

FIGS. 3 and 4 show an example in which the above-described embodiment is partially modified, and FIG. 3 is a perspective view of a main part inside a shield part (that is, a phone part) built in an upper cover of a mobile phone. 4A is a sectional view taken along the line D-D in FIG. 3, and FIG. 4B is an enlarged detailed view of a portion E in FIG. 3. In FIGS. 3 and 4, the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals, and 24 is a metal sheet. In this embodiment, the folded portion 24a of the metal sheet 24 is folded back between the key rubber sheet 12a and the key substrate 13 instead of the folded portion 14a of the metal sheet 14 shown in FIGS. The ground pattern 13a is brought into contact with the bottom contact of the key substrate 13 and the conductive coating portion of the claw portion 11b to come into contact with each other, whereby a ground earth is obtained. Therefore, also in the case of this embodiment, the same action and effect as the above-mentioned embodiment (FIGS. 1 and 2) are obtained.

[0009]

As described above in detail, according to the present invention, by providing a metal sheet for covering the upper surface of the elastic member sheet of the dial portion in the portable telephone and folding back both end sides thereof, Since the ground pattern of the key board is contacted with, and the folded part and the key board are pressed and fixed by the claw part of the cover coated with a conductive film, a good ground between the key board and the upper cover is provided via the metal sheet. Because the ground is obtained and the radio section and control section located below the elastic sheet for this purpose are electromagnetically shielded, the emission of interfering radio waves to the outside is prevented and the built-in electrical power generated by the own station's transmitted wave is prevented. It is possible to prevent adverse effects on components, and further, it is possible to expect effects such as reduction in the number of layers of the key substrate.

[Brief description of drawings]

FIG. 1 is a perspective view showing the inside of a dial section of a telephone section of the present invention.

FIG. 2 is a cross-sectional view taken along the line BB of FIG. 1 and an enlarged detailed view of a C portion.

FIG. 3 is an internal perspective view showing another embodiment of the present invention.

FIG. 4 is a detailed view of a DD section and an E section of FIG.

FIG. 5 is a perspective view showing an inner surface of a cover of a conventional example.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a perspective view of a conventional mobile phone.

[Explanation of symbols]

 11 Upper Cover 11a, 11b, 11c Claw 11d Stopper 12 Key Rubber Sheet 13 Key Board 14, 24 Metal Sheet 14a Folding Part

Claims (3)

[Claims] 1. A shield structure for a mobile phone provided in a phone part, wherein the phone part is provided in an upper cover of the mobile phone, and an acoustic / electrical conversion part, a dial part, and a display are provided. A conductive film is attached to the inner surface of the upper cover, and the dial portion is arranged with a plurality of buttons and has an elastic member sheet having a contact portion at a lower portion, and the dial portion faces the contact portion. A key substrate having a pattern portion, and providing a metal sheet covering the upper surface of the elastic member sheet,
A shield structure for a mobile phone, characterized in that the metal sheet is folded back so as to be bonded to the ground pattern of the key substrate, and the folded back portion is pressure-contacted and fixed by a claw portion provided inside the cover. . 2. The shield structure for a mobile phone according to claim 1, wherein the metal sheet is folded back so as to be joined to the lower ground pattern of the key board. 3. The shield structure for a mobile phone according to claim 1, wherein the metal sheet is folded back so as to be joined to the upper ground pattern of the key substrate.