JPH11175685A - Electronic card and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic card with a high strength and strong against noise. SOLUTION: A metal cover 30 is applied onto a printed wiring board 10 formed by mounting a connector 20 on one side and on which electronic parts are mounted. The metal cover 30 is provided with a folded chips 31 whose surfaces are brought into contact along three other sides except the side on which the connector 20 is mounted, a laminated projecting part is molded by a resin material at a state that the laminated projecting part projected by laminating the folded chips 31 and the printed wiring board 10 is projected in three directions and a frame coupled with three sides is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a modem card, a memory card or other function card inserted into a card slot or the like of a notebook personal computer or a memory card inserted and used in a card slot of a digital camera. The present invention relates to an electronic card suitable for application to various types of cards.

[0002]

2. Description of the Related Art As shown in, for example, Japanese Patent Application Laid-Open No. 3-78184, a conventional electronic card includes a printed wiring board 110 on which semiconductor integrated circuit electronics such as a memory are mounted (FIG. 5).
), A card connector 120 mounted on one side of the printed wiring board 110, and metal covers 130A and 130B that cover both sides of the printed wiring board 110 and obtain a shielding effect.
And the printed wiring board 110 and the metal cover 130
A, resin frame 140 integrally holding 130B
The metal covers 130A and 130B and the printed wiring board 110 are overlapped with each other and welded together by, for example, supersonic welding or the like, and are electrically connected. The metal plates 130A and 130B are electrically connected to each other. In order to connect the metal plates 130A and 130B to the common potential point of the printed wiring board 110, a coil spring 150 and a conductive sleeve 160 are provided, and the coil spring 150 electrically connects the metal plates 130A and 130B to each other. Conductive sleeve 16
0 is brought into contact with the common potential of the printed wiring board 110, and the metal plates 130A and 130B are connected to the common potential point of the printed wiring board 110 through the conductive sleeve 160 and the coil spring 150.

[0003]

According to the structure of the conventional electronic card shown in FIG. 5, the printed wiring board 110 and the metal plates 130A and 130B are superimposed on the frame 140, and the superimposed state is set between three persons. Ultrasonic vibration is applied from an ultrasonic welding machine, and the joint surface is heated and welded by the ultrasonic vibration. Therefore, the bonding strength is weak and causes breakage. That is, there is a disadvantage that the strength is weak and the durability is lacking. Furthermore, the connection circuit for connecting the metal plates 130A and 130B to the common potential point of the printed wiring board 110 has a small contact area, so that the contact resistance becomes large, and thus the shielding effect becomes incomplete.

A first object of the present invention is to provide an electronic card having a strong structure and a high durability. A second object of the present invention is to provide an electronic card having a structure capable of reducing a contact resistance between a metal plate and a common potential of a printed wiring board and obtaining a complete shielding effect.

[0005]

According to the present invention, there is provided a printed wiring board on which electronic components are mounted, a connector mounted on one side of the printed wiring board, and a connector of the printed wiring board which is put on both sides of the printed wiring board. A metal cover having a bent piece that comes into surface contact with the printed wiring board along a side that is not mounted, and a mold resin material that covers a laminated protruding portion where the bent piece formed on the metal cover and the printed wiring board are stacked. An electronic card is constituted by a frame molded by the above method. That is, in the electronic card according to the present invention, the metal parts are put on both sides of the printed wiring board in which the electronic parts and the connector are mounted, and the bent pieces formed on the metal cover are attached to the other three sides where the printed wiring board connector is not mounted. The printed wiring board and the metal cover are fixed by a molded frame to obtain an electronic card with high strength because the printed wiring board and the metal cover are fixed by a molded frame. Can be done.

The present invention further proposes a structure in which a ground pattern is formed along the other side of the printed wiring board on which no connector is mounted, and a bent piece formed on a metal cover is brought into surface contact with the ground pattern. By exploring this structure, the metal cover can be connected directly to the common potential point of the printed wiring board by surface contact. Therefore, the metal cover can be connected to the common potential with low contact resistance. As a result, there is obtained an advantage that an electronic card resistant to noise can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an electronic card according to the present invention and an example of a method for manufacturing the same will be described with reference to FIGS. First, as shown in FIG. 1, a printed wiring board 10 on which electronic components A and B and a connector 20 are mounted is prepared. The electronic components A and B are a hybrid I with a built-in semiconductor memory or modem.
C and any other electronic components are conceivable.

The connector 20 has an insulating body 21 having a length substantially equal to the length of a side on which the printed wiring board 10 is to be mounted.
And a concave groove 22 formed on the front surface of the insulating body 21;
Contacts 23 arranged and mounted inside the concave grooves 22
And a connector terminal (not shown) formed integrally with the contact 23 and led out from the back side of the insulating body 21 and soldered to a conductive pattern formed on the printed wiring board 11.

Thus, the metal cover 30 is put on the printed wiring board 10 on which the electronic components A and B and the connector 20 are mounted. The upper and lower metal plates of the metal cover 30 have the same structure. That is, bent pieces are provided on the other three sides of the printed wiring board 10 except for the side on which the connector 20 is mounted. The bent piece 31 is bent outward by a bent piece 32 at a position away from the plate surface of the metal cover 30, and is bent in a direction parallel to the plate surface of the metal cover 30.

When the length L of the bent piece 32 is appropriately set and the bent piece 31 is brought into contact with the surface of the printed wiring board 10, the back surface of the metal cover 30 is positioned above the surface of the insulating body 21 of the connector 20. Configure to make contact. Positioning projections 33A and 33B are formed on the front end side of the metal cover 30, and these positioning projections 33A and 33B are attached to the insulating body 21 of the connector 20.
And the position of the metal cover 30 is fixed. Accordingly, in this state, each bent piece 31 formed on the metal cover 30 is arranged along each of the three sides of the printed wiring board 10. FIG. 2 shows this state.

According to the present invention, the resin is inserted into a molding die in a state shown in FIG. 2, and a resin is injected into a portion shown by a broken line in FIG.
The laminated protruding portion M in which the bent piece 31 and the printed wiring board 10 are laminated and protruded is molded with resin, and the laminated protruding portion M is inserted and fixed in the resin. FIG.
Indicates the state of the finished product after insert molding of the resin.
Reference numeral 40 shown in FIG. 4 indicates a frame obtained by insert molding. Reference numeral 41 denotes a key groove formed at one of the front ends of the frame 40 for preventing erroneous insertion. This key groove 41
Are also integrally formed during insert molding.

Further, as shown in FIG. 3, the bent piece 31 protruding rearward of the metal cover 30 is protruded longer than the rear edge of the printed wiring board 10, and a hole 33 is formed in the protruding portion. The resin is formed by flowing the resin through the opening 33 and flowing into the opposed gap of the bent piece 31 and by curing the resin by connecting the resin to the front and back of the bent piece 31 through the hole 33. The bonding force between the frame 40 and the metal cover 30 is strengthened, and an effect of preventing an accident that the frame 40 comes off from the united structure of the metal cover 30 and the printed wiring board 10 is also obtained.

As described above, according to the present invention, the metal cover 30 is laminated on the printed wiring board 10 and inserted into a resin molding die in the laminated state, and the resin is insert-molded. (1), a large number of electronic cards can be produced in a short time without any trouble in assembling. The printed wiring board 10
And the bent piece 31 formed on the metal cover 30 are laminated and united,
Since the laminated combined protruding portion M is molded with a resin material, a strong electronic card can be obtained.

The present invention further proposes a structure for completing the shield. For this purpose, as shown in FIG. 1, a ground pattern 1 electrically connected to a common potential point along each side of the printed wiring board 10 where the connector 20 is not mounted.
1 and a metal cover 3 is formed on the ground pattern 11.
Since the metal cover 30 is connected to the common potential point with low contact resistance by this configuration in which the bent pieces 31 formed in zero are in surface contact, the shielding effect can be enhanced.

[0015]

As described above, according to the present invention, the metal cover 30 is put on the connector 20 and the printed wiring board 10 on which the required electronic components A and B are mounted, and then placed in a resin molding die. And mold the periphery with resin material,
Since the frame 40 is formed of a resin material, a strong electronic card can be obtained. Especially it becomes a structure that can be disassembled because it is hardened by the mold,
It is possible to prevent an accident in which a user disassembles and breaks without permission. Further, since the assembly is completed by the work of simply stacking the metal cover 30 on the printed wiring board 10 and inserting the metal cover 30 into a mold, the assembly is not troublesome and suitable for mass production. Furthermore, since the structure for securely connecting the metal cover 30 to the common potential point is provided, an advantage that an electronic card resistant to noise can be provided is obtained, and the effect is extremely large for practical use.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view for explaining a structure and a manufacturing method of an electronic card according to the present invention.

FIG. 2 is a perspective view showing a state where the printed wiring board and the metal cover are combined from the state of FIG. 1;

FIG. 3 is a plan view for explaining how to perform molding in the state shown in FIG. 2;

FIG. 4 is a perspective view illustrating an example of an electronic card obtained by the manufacturing method of the present invention.

FIG. 5 is an exploded perspective view for explaining a conventional technique.

[Explanation of symbols]

 Reference Signs List 10 printed wiring board 11 ground pattern 20 connector 21 insulating body 22 concave groove 23 contact 24 groove 30 metal cover 31 bent piece 40 frame M laminated protruding portion

Claims (3)

[Claims] 1. A printed wiring board on which electronic components are mounted; B; a connector mounted on one side of the printed wiring board; C. the connector of the printed wiring board which is put on both sides of the printed wiring board. D, a metal cover having a bent piece that is in surface contact with the printed wiring board along the side where D is not attached, D, covering a portion where the bent piece formed on the metal cover and the printed wiring board are laminated, 3 of the above printed wiring board
An electronic card, comprising: a frame bonded to a side and formed of a resin material. 2. The electronic card according to claim 1, wherein a ground pattern electrically connected to a common potential point is formed on a surface of the printed wiring board in contact with the bent piece formed on the metal cover. An electronic card, wherein the metal cover is connected to a common potential point through a pattern. 3. A printed wiring board on which a connector is mounted on one side and electronic components are mounted on a board surface, and a folded surface which comes into surface contact with the board surface of the printed wiring along a side of the printed board on which the connector is not mounted. A metal cover having a piece; a metal cover provided on both sides of the printed wiring board; a bent piece of the metal cover formed on a side of the printed wiring board where the connector is not mounted; An electronic card, wherein a laminated protruding portion obtained by laminating plates is inserted into a resin molding die, a resin material is molded on the laminated protruding portion to form a frame, and the laminated protruding portion is fixed by the frame. Manufacturing method.