JPH11175684A - Electronic card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic card easily assembled and high in intensity. SOLUTION: The electronic card is constituted of a printed wiring board 10 formed by mounting a connector 20 on one side and mounting electronic parts A, B on a board surface, a metal cover 30 to be covered on one and the other surfaces of the printed wiring board 10 and provided with a folded chip whose surface is brought into contact with the board surface of the printed wiring board 10 along the side on which no connector is stuck of the printed wiring board 10 and a U-shaped frame 40 to be engaged in other sides except a part, on which the connector is mounted, of the printed wiring board 10, and a recessed slot 43 is formed in a frame 40. And, the metal cover 30 is pressed against the printed wiring board 10 by engaging a part on which the printed wiring board 10 and the folded chip of the metal cover 30 are superposed in the recessed slot 43 and fall-off of the frame 40 is simultaneously prevented by engaging a locking chip 25 formed at both sides of the connector 20 in a locking hole 46 formed in the frame 40.

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 disclosed in, for example, Japanese Patent Application Laid-Open No. 3-78184, a printed wiring board 110 on which a semiconductor integrated circuit element such as a memory is mounted (see FIG. 13) and one side of the printed wiring board 110 are conventionally known. , A metal cover 130A, 130B that covers both sides of the printed wiring board 110 to obtain a shielding effect, and a resin frame 140 that integrally holds the printed wiring board 110 and the metal covers 130A, 130B. The metal covers 130A and 130B and the printed wiring board 110 are respectively superposed and welded to each other by, for example, ultrasonic welding or the like to be integrated.

[0003] Electrical conduction between the metal plates 130A and 130B is performed.
0B to the common potential point of the printed wiring board 110, the coil spring 150 and the conductive sleeve 160
Is provided, and the metal plate 130 is
A and 130B are electrically connected to each other, the conductive sleeve 160 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 It is structured to be connected to a potential point.

[0004]

According to the structure of the conventional memory card shown in FIG. 13, the printed wiring board 110 and the metal plates 130A and 130B are superimposed on the frame 140, and a three-way operation is performed in the superimposed state. Since ultrasonic vibrations are applied from the ultrasonic welding machine to the joints and the joint surfaces are heated and welded by the ultrasonic vibrations, there is a disadvantage that expensive equipment such as an ultrasonic welding machine is required for assembly.

Further, the connection circuit for connecting the metal covers 130A and 130B to the common potential point of the printed wiring board 110 has a small contact area and therefore has a large contact resistance, and thus has a disadvantage that the shield is incomplete. A first object of the present invention is to provide an electronic card having a structure that does not require expensive equipment for assembly.

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 cover and a common potential of a printed wiring board and obtaining a complete shielding effect. It is.

[0007]

According to the present invention, there is provided a printed wiring board on which electronic components are mounted, and a connector mounted on one side of the printed wiring board and having locking portions formed on both longitudinal end surfaces of an insulating body. And a metal cover having a bent piece that is placed on both sides of the printed wiring board and is in surface contact with the printed wiring board along a side where the connector of the printed wiring board is not mounted; A pair of leg members joined to pieces parallel to each other, and a connecting member joining one end side of the pair of leg members and joined to a piece parallel to a side on which the connector is mounted. A concave groove having a groove width corresponding to the thickness of the folded portion of the metal cover and the printed wiring board is formed on the U-shaped inner surface formed by the member and the connecting member, and further, the tip of a pair of leg members of A frame which the engaged portion is formed for retaining engaged with the engaging portion projecting from the connector end faces of the surface, the is obtained by constituting the electronic card.

According to the structure of the present invention, the metal cover is superposed on the upper and lower surfaces of the printed wiring board on which the connector and the electronic component are mounted, and the printed wiring board is inserted into the groove formed in the leg member of the frame in this state. Insert the part where the bent piece of the metal cover overlaps, slide the frame and engage the locking part formed on the insulating body of the connector with the locked part formed at the tip of the leg member Assembly is completed, and the frame, printed wiring board and metal cover are integrated.

Accordingly, assembly can be performed without using expensive equipment, and cost reduction can be expected. Further, the time required for assembly can be shortened, and in this respect, cost reduction can be expected. Further, in the present invention, a bent piece is formed on the metal cover, and the bent piece is brought into surface contact with the board surface of the printed wiring board. By forming the ground pattern connected to the potential, the metal cover can be brought into direct contact with the common potential point on the printed wiring board. Of course, the contact area can be made large, so that the contact resistance can be reduced. Therefore, an advantage that the shielding effect can be enhanced in this respect is also obtained.

[0010] Further, a positioning groove is formed in the insulating body of the connector in a direction perpendicular to the insertion / removal direction of the connector, and a positioning projection piece bent from a metal cover is engaged with the positioning groove, whereby the connector is provided. It is strongly supported by the metal cover, and the position of the connector can be maintained firmly. Therefore, this structure prevents external force from being applied to the terminal protruding from the connector and soldered to the printed wiring board, so that no excessive force is applied to the terminal and no accident such as disconnection of the terminal occurs. The advantage is that an electronic card with high durability and reliability can be provided.

[0011]

FIG. 1 is an exploded view of an electronic card according to the present invention. In the figure, reference numeral 10 denotes a printed wiring board. In this example, a case is shown where electronic components A and B are mounted on both one end surface and the other surface of the printed wiring board 10.
Each of the electronic components A and B is a semiconductor memory, or a hybrid IC having a built-in modem, and various components are mounted thereon.

The printed wiring board 10 has a square or rectangular shape. In the case of a rectangular shape, the connector 20 is generally mounted on one of the short sides thereof. The connector 20 has an insulating body 21 having a rectangular shape having a length substantially equal to the length of a side of the printed wiring board 10 to be mounted and having a front face having a thickness several times larger than the thickness of the printed wiring board 10. Contacts 23 arranged and mounted in concave grooves 22 formed on the front surface of the insulating body 21 and a plurality of connector terminals 24 communicating with the contacts 23 and projecting rearward from the rear surface of the insulating body 21 (see FIGS. 4 and 5). 5), and this connector terminal 24 is soldered to a conductive pattern formed on the printed wiring board 10. Locking portions are formed on both end surfaces in the longitudinal direction of the insulating body 21. This embodiment shows a case in which a locking piece 25 is formed as a locking portion. Locking piece 2
Reference numeral 5 protrudes obliquely from the rear end side to the front end side of the insulating body 21. When a frame 40 described later is inserted from behind, it is bent toward the wall surface of the insulating body 21 as shown in FIG.

In this example, the printed circuit board 10 with the connector 20 mounted thereon is covered with a metal cover 30 on both the front side and the back side. The metal cover 30 includes a bent piece 31 that comes into surface contact along the other three sides of the printed wiring board 10 where the connector 20 is not mounted. The bent piece 31 is formed by bending outward from the tip of the bent piece 32 bent at a right angle from the plate surface of the metal cover 30 in the right angle direction.
2, the back surface of each metal cover 30 is placed on the flat surface of the insulating body 21 of the connector 20 in a state where the length L (see FIG. 1) is appropriately selected and the bent piece 31 is in contact with the surface of the printed wiring board 10. It is constituted so that it may contact.

[0014] Positioning projections 33A and 33B are formed on each side of a portion of the metal cover 30 that contacts the connector 20.
On the other hand, the uneven plane of the insulating body 21 constituting the connector 20 is shown in FIGS. 4 and 5 in a direction parallel to the longitudinal direction of the insulating body 21 (a direction perpendicular to the insertion / removal direction of the connector 20).
The groove 26A is formed as shown in FIG.
The two grooves 26B are formed in the direction perpendicular to the both ends of the groove 26A, and the positioning protrusions 33A are formed in these grooves 26A and 26B.
And 33B are inserted to fix the position of the metal cover 30.

FIG. 2 shows a state in which the metal covers 30 are put on both sides of the printed wiring board 10 and they are mutually laminated. In this laminated state, the frame 40 is inserted from the rear, and the laminated state of the metal cover 30 and the printed wiring board 10 is fixed by the frame 40 to complete the assembly. For this purpose, the frame 40
Includes a pair of leg members 41 joined to parallel sides of the printed wiring board 10 where the connector 20 is not mounted, and a connecting member 42 that connects one end side of the pair of leg members 41.

A concave groove 43 is formed on each inner peripheral surface of the leg member 41 and the connecting member 42. The groove width of the concave groove 43 is selected to be substantially equal to or slightly larger than the thickness of the printed wiring board 10 and the bent piece 31 of the metal cover 30 laminated. Therefore, the printed wiring board 10 and the bent piece 31 of the metal cover 30 that are stacked in the concave groove 43 are inserted, and the frame 40 is slid forward.

A wide concave portion 44 is formed at the distal end of the leg member 41 so as to communicate with the concave groove 43, and the end of the insulating body 21 constituting the connector 20 is housed in the wide concave portion 44.
A locked portion is formed on the side surface of the wide concave portion 44. This embodiment shows a case where a locking hole 45 is formed as a locked portion.
The locking pieces 25 formed on both end surfaces of the connector 20 are engaged with the locking holes 45 as shown in FIG. 5 to prevent the frame 40 from coming off, and the assembly is completed as shown in FIG. The groove 46 formed at one end of the leg member 41 constituting the frame 40 is a key groove for preventing erroneous insertion.

As described above, according to the structure of the electronic card according to the present invention, the metal cover 30 is put on the printed wiring board 10, and the frame 40 is inserted from the rear in this state, whereby the assembly is completed and the assembly is completed easily. can do. The present invention further proposes a structure that stabilizes the contact between the metal cover 30 and the common potential point of the printed wiring board 10, reduces the contact resistance, and obtains a high shielding effect. 6 and 7 show the embodiment. As shown in FIGS. 6 and 7, a ground pattern 11 electrically connected to a common potential point is formed along the side of the printed wiring board 10 where the connector 20 is not mounted.
1 is brought into surface contact with the bent piece 31 formed on the metal cover 30. The ground pattern 11 is formed on both surfaces of the printed wiring board 10 as shown in FIGS. 6 and 7, and the metal cover 30 placed on either surface is
Through a common potential. As described above, by securely connecting the metal cover 30 to the common potential, the shield is completed, and the effect of reliably removing the influence of noise is obtained.

FIGS. 8 and 9 show an embodiment of a structure for increasing the bonding strength between the frame 40 and the metal cover 30. FIG. In the embodiment shown in FIGS. 8 and 9, the engagement protrusion 34 is formed on the bent piece 31 of the metal cover 30, and
The engagement recess 4 is also provided inside the recess 43 formed in the leg member 41 of FIG.
7 is formed, and the engaging projections 34 formed on the metal cover 30 are engaged with the engaging concave portions 47 to increase the coupling force between the frame 40 and the metal cover 30. By adopting this structure, the bonding force between the frame 40 and the metal cover 30 can be increased, and the advantage that the overall durability can be improved can be obtained. In order to form the engaging concave portion 47 inside the concave groove 43, it is possible to form the engaging concave portion 47 by using a partially movable mold.

FIGS. 10 and 11 show another example for improving the durability of the electronic card. In the example shown in FIG. 10, a hole is formed in a laminated portion of the leg member 41, the metal cover 30, and the printed wiring board 10, and a pin 50 is inserted into the hole. A case is shown in which the bonding strength between the plate 10 and the laminate is increased. The pin 50 is made of a resin material, and has a locking projection 51 having elasticity at the tip end as shown in FIG.

FIG. 12 shows still another embodiment of the present invention. The embodiment shown in FIG. 12 shows a structure in which the electronic component A is mounted on only one surface of the printed wiring board 10 and the electronic circuit B is not mounted on the other surface. Therefore, in this case, the metal cover 30 is covered only on the mounting surface side of the electronic component A, and the other surface is covered with the closing plate 4 formed integrally with the frame 40.
Closed by 7. For example, a conductive layer may be deposited on the back side of the closing plate 47, that is, on the surface facing the printed wiring board 10 by vapor deposition or the like, and the conductive layer may be used as a substitute for the metal cover 30.

In this embodiment, a ground pattern 11 is attached to each side of the printed wiring board 10 as shown in FIGS. It can be stably connected to a point, and the effect of noise can be reduced.

[0023]

As described above, according to the present invention, the printed wiring board 10 is covered with the metal cover 30 on one or both surfaces, and the printed wiring board 10 and the metal cover 30 are laminated on the frame. 40 is inserted and slid, and the locking piece 2 is inserted into a locking hole 45 provided at the end of the frame 40.
By engaging 5, the frame 40 is prevented from coming off, and the assembly is completed as shown in FIG. Therefore, it can be easily assembled and is suitable for mass production. In addition, there is an advantage that the cost can be expected to be reduced because the assembly can be simplified.

According to the present invention, the connector 2 is inserted into a locking hole 45 formed at the tip of the leg member 41 constituting the frame 40.
The engaging pieces 25 formed on both end surfaces of the metal cover 30 are engaged with each other, and the portion where the metal cover 30 and the printed wiring board 10 are laminated is suppressed and integrated by the concave groove 43, so that the mechanical strength is strong and the durability is high. Electronic card with high cost.

Further, according to the present invention, the metal cover 30 is provided with the bent piece 31 which comes into surface contact with the printed wiring board 10 and the bent piece 31 is brought into contact with the ground pattern 11. Can be stably brought into contact with the common potential point (with a small contact resistance).
Therefore, there is obtained an advantage that it is possible to reliably provide an electronic card which can reliably shield against noise and also has high electrical reliability, and the effect is extremely large in practical use.

In the above description, an example is described in which the locking pieces 25 are formed on both sides of the connector 20 so as to protrude and the locking holes 45 are formed in the leg members 41 of the claim 40. It can be easily understood that the frame 40 can be prevented from coming off even if the locking hole is formed in the connector.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view for explaining an embodiment of the present invention.

FIG. 2 is a perspective view for explaining a state in which a metal cover is put on both sides of a printed wiring board in the state shown in FIG. 1;

FIG. 3 is a perspective view showing a state where assembly of the embodiment shown in FIG. 1 is completed.

FIG. 4 is a cross-sectional view for explaining a process during assembly in the embodiment shown in FIG. 1;

FIG. 5 is a cross-sectional view for explaining an end state of assembly in the embodiment shown in FIG. 1;

FIG. 6 is a plan view for explaining an embodiment of a structure for stably connecting a metal cover to a common potential point of a printed wiring board according to the present invention.

FIG. 7 is a rear view of FIG. 6;

FIG. 8 is a plan view of a metal cover for explaining an embodiment of a structure for increasing the engagement force between the metal cover and the frame according to the present invention.

FIG. 9 is an enlarged cross-sectional view for explaining an assembled state of the structure for increasing the engagement force between the metal cover and the frame described in FIG. 8;

FIG. 10 is a cross-sectional view for explaining a modified example of the structure for enhancing the engagement force between the metal cover and the frame described in FIG. 8;

11 is an enlarged sectional view showing a part of FIG. 10 in an enlarged manner.

FIG. 12 is a sectional view for explaining a further modified embodiment of the present invention.

FIG. 13 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 connector terminal 25 locking piece 30 metal cover 31 bent piece 33A, 33B positioning protruding piece 40 frame 41 leg member 42 connecting member 43 concave groove 44 wide Recess 45 Lock hole

Claims (5)

[Claims] 1. A printed wiring board on which electronic components are mounted; B; a connector mounted on one side of the printed wiring board and having locking portions formed at both longitudinal end surfaces of an insulating body; A metal cover having a bent piece placed on both sides of the printed wiring board and in surface contact with the printed wiring board along a side of the printed wiring board on which the connector is not mounted; A pair of leg members joined to sides parallel to each other of the side where the connector is not mounted, and a connecting member connecting one end side of the pair of leg members and joining to a side parallel to the side where the connector is mounted. A convex groove having a groove width corresponding to the thickness of the metal cover and the printed wiring board is formed on the U-shaped inner surface formed by the pair of leg members and the connecting member. A frame formed with a locked portion that engages with a locking portion protruding from both end surfaces of the insulating body constituting the connector on an inner surface of a distal end of the leg portion and prevents the locking portion from coming off. Electronic card. 2. The electronic card according to claim 1, wherein a ground pattern connected to a common potential is provided on a surface of said printed wiring board which comes into surface contact with said bent piece of said printed wiring board. Electronic card. 3. The electronic card according to claim 1, wherein a positioning groove is formed on both flat surfaces of the insulating body forming the connector, at least in parallel with at least the longitudinal direction of the insulating body. An electronic card having a structure in which a positioning protrusion bent from a metal cover is engaged to support and reinforce the connector with the metal cover. 4. The electronic card according to claim 1, wherein an engaging projection is formed on a bent piece of the metal cover, and the engaging projection is formed in a concave groove formed in a leg member of the frame. An electronic card characterized in that it has a structure in which an engagement recess is formed to engage with the frame, and the engagement strength between the frame and the metal cover is enhanced by engaging the engagement protrusion with the engagement recess. 5. The electronic card according to claim 1, wherein a bent piece of the metal cover engaged with the concave groove and a plate surface of the printed wiring board are penetrated from outside the leg constituting the frame. An electronic card having a structure in which a hole is formed, and a pin is inserted into the hole to enhance a bonding force between the frame, the metal cover, and the printed wiring board.