JP2000286584A - Shield structure of portable communication equipment - Google Patents

Abstract

(57) [Problem] To provide a shield structure which can reduce the number of parts and the number of assembling steps, reliably ground, and provide a stable shielding effect when a board is shielded by a shield case. It is in. A contact piece (4) is formed at a contact portion (6) of a shield case (1) that contacts a substrate (2). The contact piece 4 has a notch 42 in the contact portion 6 of the shield case 1, is formed in an elongated shape along the contact surface 6, has flexibility inside the contact surface 6, and has a tip at the tip thereof. Convex part 4 protruding outward
1 is formed. Shield case 1 to substrate 2
, The case 1 and the substrate 2 are fixed in contact with the contact surface 6. The contact piece 4 comes into pressure contact with the tip convex portion 41 being pressed by the substrate 2 and flexing in the direction of the inner cutting groove 42.

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 a portable communication device, comprising a substrate for the portable communication device and a shield case for shielding the substrate.

[0002]

2. Description of the Related Art When a substrate is shielded by a case, the case and the substrate must be securely in contact with each other in order to ground. Conventionally, as a means for bringing the case into contact with the substrate, there is a method of fixing the case 41 to the substrate 42 with screws 43 as shown in FIG.

In FIG. 5, a claw 53 is formed on a case 51, and the claw 53 is hooked and fixed on a substrate 52. In this method, the leaf spring 54 is attached to the contact portion of the case 51 to be fixed and brought into contact, and when the substrate 52 and the case 51 are fixed, the leaf spring 54 is brought into spring contact.

FIG. 6 shows that when a nail 63 formed on a case 61 is hooked and fixed on a substrate 62, a leaf spring 64 is soldered to a contact portion on the substrate 62 side, and the leaf spring 64 attaches the leaf spring 64 to the case 61. This is a method of making spring contact.

Further, as a conventional method, there is a method combining the methods shown in the above-mentioned drawings and the like.

FIG. 7 shows a double shield structure. An internal shield plate 71 for shielding an electronic component 75 mounted on the substrate 74 and a substrate 74 covering the internal shield plate 71
An earth finger 73 is inserted between the shield case 72 and the entire case. When the substrate 74 and the housing shield case 72 are fixed by screws 76, the ground finger 73 is connected to the inner shield plate 71 and the housing shield case 72.
And pressurized contact. Thus, the ground potential of the inner shield plate 71 and the ground potential of the housing shield case 72 are made equal, the shielding effect is improved, and the radiation of the housing and the isolation with the outside are improved.

[0007]

However, according to the conventional method, since screws or leaf springs are arranged at the case side or at arbitrary places where the board is to be surely brought into contact, the number of parts and the number of assembling steps increase. There is a problem of high cost.

In the case of the double shield structure, the ground finger 73 is fixed to the inner shield plate by soldering or with an adhesive tape, but it takes a long time to perform the operation, and there is a problem that the characteristics are varied.

An object of the present invention is to reduce the number of parts and the number of assembling steps when shielding a board with a shield case.
Another object of the present invention is to provide a shield structure that can reliably take the ground and provide a stable shield effect.

[0010]

SUMMARY OF THE INVENTION The object of the present invention is to form a notch in a contact portion of a shield case, which is in contact with a substrate, to be elongated along a contact surface, to have flexibility inside the contact surface, and This is achieved by providing a contact piece having a projection formed at the tip to protrude outward from the contact surface.

According to the above-mentioned means, when the shield case is contacted and fixed to the substrate, the contact pieces formed on the contact portions of the shield case are brought into pressure contact with the tip convex portions being pressed by the substrate and flexing inward. Further, since the contact piece has a spring property, it can be brought into cushion contact and surely brought into contact. Thereby, the ground between the substrate and the shield case can be reliably taken.

[0012] Further, the object is to form a hook at a position facing the internal shield plate on the inner surface of the casing shield case in the case of the double shield structure, and swell the center abdomen outward with both ends sandwiched between the hooks. This is achieved by providing an earth finger for pressing against the inner shield plate.

According to the above means, when the casing shield case is fixedly contacted to the substrate, the ground finger comes into pressure contact between the casing shield case and the inner shield plate. Since the ground finger has a spring property, it comes into cushion contact, and the ground between the substrate, the housing shield case, and the internal shield can be reliably taken.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a state before mounting a shield case and a substrate according to an embodiment of the present invention, and FIG. 2 is a view showing a state after mounting.

In FIG. 1, (a) is a perspective view of the shield case 1 and the substrate 2 before attachment, and (b) is a side view. In the figure, nails 3 for hooking and fixing to the substrate 2 are formed at several places on the case side, and notches 5 for hooking the nails 3 on the substrate side.
Are formed. In addition, contact pieces 4 are formed at four places of a contact surface portion 6 of the case 1 with the substrate 2. This contact piece 4
As shown in an enlarged side view in FIG. 3C, a cut 42 is formed in the contact portion, and the contact portion 6 is formed in an elongated shape along the contact surface 6, has flexibility inside the contact surface 6, and has a distal end. The projection 41 is formed to protrude outward from the contact surface 6.

FIG. 2 shows a state in which the claws 3 of the shield case 1 are hooked on the substrate 2 and attached, and the case 1 and the substrate 2 are fixedly contacted by the contact surface 6 as shown in FIGS. .
As shown in the enlarged view of FIG. 3C, the contact piece 4 formed on the contact portion 6 has the tip convex portion 41 pressed by the substrate 2 and the inner cut groove 4.
It comes into pressure contact while bending in two directions. Further, since the contact piece 4 has a spring property, the contact piece 4 comes into cushion contact with the substrate 2 and the contact conduction can be reliably stabilized. Therefore, the ground between the substrate 2 and the shield case 1 can be reliably taken, and the shielding effect such as radiation from the housing can be enhanced.

FIG. 3 shows a double shield structure according to another embodiment of the present invention. The structure of the conductive inner shield plate 11 having a double shield structure, the housing shield case 12, the substrate 15, the screw 16 and the like, at least the inside of which is conductive, are the same as those of the related art. The ground finger provided between the cases 12 is different.

As shown in the figure, the earth finger of the present invention includes an inner shield plate 1 on the inner surface of a housing shield case 12.
A hook 13 for hooking is formed at a position facing 1 and both ends of the ground finger 14 are sandwiched between the hooks 13.
The central abdomen is provided in a shape bulging outward. When the housing shield case 12 is fixed to the substrate 15 by screwing 16 or the like, the ground finger 14 brings the bulging abdomen into pressure contact with the inner shield plate 11.

Further, since the earth finger 14 has a spring property, the earth shield 14 comes into cushion contact with the inner shield plate 11 from the housing shield case 12, thereby improving the contact and making stable contact. Therefore, the substrate 15 and the casing shield case 12
And the internal shield plate can be reliably grounded.

Since both ends of the earth finger 14 are sandwiched between hooks formed in the casing shield case 12, the earth finger 14 is stably held and a stable shielding effect can be obtained.

In the embodiment shown in FIG. 3, a contact piece having a projection projecting outward from the contact surface of the embodiment shown in FIG. By doing so, if the contact between the board 15 and the casing shield case 12 is ensured, the ground between the board 15, the casing shield case 12 and the internal shield plate 11 can be reliably taken. For the purpose of improving the shielding effect of the shield case, plating, vapor deposition and the like can be applied to the inside of the case.

[0023]

As described above, according to the present invention, the number of parts of the shield structure can be reduced, the number of assembling steps can be reduced, and the ground can be reliably taken. As a result, a stable shielding effect is obtained by the shield case, and improvement in the performance of the wireless device can be realized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention before assembly.

FIG. 2 is a configuration diagram after assembly of an embodiment of the present invention.

FIG. 3 is a sectional view of an assembly configuration according to another embodiment of the present invention.

FIG. 4 is a conventional configuration diagram.

FIG. 5 is a conventional configuration diagram.

FIG. 6 is a conventional configuration diagram.

FIG. 7 is a conventional configuration diagram.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shield case, 2 ... Board, 3 ... Mounting claw, 4 ... Contact piece, 41 ... Convex part, 42 ... Cut groove, 5 ... Notch, 6 ... Contact surface part, 11 ... Internal shield plate, 12 ... Housing shield case , 13 ... hook, 14 ... ground finger, 15 ... board, 16 ... screw.

Claims (2)

[Claims] In a shield structure of a portable communication device, comprising: a board of the portable communication device; and a shield case that is in contact with and fixed to the substrate and shields, a contact portion of the shield case that contacts the board. A contact piece which is formed to be elongated along the contact surface by making a cut, has flexibility inside the contact surface, and has a convex portion formed at the tip to protrude outward from the contact surface. Mobile communication equipment shield structure. 2. A portable communication device comprising: a substrate; an internal shield plate for shielding components mounted on the substrate; and a housing shield case for covering the internal shield plate and contacting and fixing to the substrate to shield the whole. In the configured portable communication device shield structure, a hook is formed on the inner surface of the housing shield case at a position facing the internal shield plate, and the center abdomen is bulged outward by sandwiching both ends of the hook. A shield structure for a portable communication device, wherein an earth finger is provided for pressing against an inner shield plate.