JP2007294306A - Ground connection structure of card connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance an electromagnetic shield function and grounding performance of a card connector without forcing the change of a ground pattern of a wiring board, in an apparatus such as an IC recorder. <P>SOLUTION: By soldering a metallic frame 21 having a gate-like shape in the front view to a wiring board 1, a card connector 2 is mounted on the wiring board 1. Screwing pieces 27, 27 are added to right and left side plate parts 21a, 21a of the frame 21, and the screwing pieces 27, 27 are fixed by screws by using fastening screws 6 in the state where they are superposed on a metallic chassis 5 having a card-inserting slot 51 in a contacting state, whereby the frame 21 is directly grounded and connected to the chassis 5 through the superposition parts between the screwing pieces 27 and the chassis 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, the card connector ground connection structure, in particular, the frame of the card connector forming the card insertion space is formed of a metal plate such as a sheet metal, and the frame is grounded (GRD connection). The present invention relates to a ground connection structure for a card connector.

  Conventionally, an interface between a card and an external device is realized by inserting the card into the card connector, preventing a situation where the card inserted into the card connector causes electrostatic breakdown or the like due to radiation or intrusion of electromagnetic waves, etc. Various studies have been made on (see, for example, Patent Document 1 and Patent Document 2). Of these, Patent Document 1 describes a card connector mounted on a circuit board by screwing, and Patent Document 2 describes a connector that is fitted in an opening formed in the apparatus housing. . And both of them prevent the electrostatic breakdown of the card by electrically short-circuiting the card surface and the frame (shell part) of the card connector and balancing the potentials of both as described above. It can be said that it is intended.

  On the other hand, FIG. 3 is a plan view of another conventional example, and FIG. 4 is a side view thereof. The card connector 2 shown in these drawings includes a metal frame 21 and a body 22 made of an electrical insulator, and is surface-mounted on the wiring board 1. In this case, surface mounting is performed by soldering a plurality of lower end edge portions of the left and right side plate portions of the frame 21 formed in a flat frontal gate shape to a ground pattern (GND pattern: not shown) formed on the wiring board 1. In FIG. 3 and FIG. 4, the soldering portion is indicated by reference numeral 25. Then, by inserting a card (not shown) in the card insertion space formed by the frame 21 as indicated by an arrow A, the card-side electrode comes into contact with the electrode 23 as a counter electrode provided in the body 22. It has become. In this card connector 2, a ground contact piece 24 is formed by cutting up and forming on the frame 21, and this ground contact piece 24 elastically contacts the surface of the card to balance the card surface potential and the card connector 2 potential. Helpful. In addition, a circuit connection connector 3 having a plurality of connection terminals (not shown) corresponding to a signal circuit and a ground circuit (GND circuit) is mounted on the wiring board 1, and a plurality of connections of the circuit connection connector 3 are mounted. The terminals are divided into those connected to the signal circuit formed on the wiring board 1 and those connected to the ground circuit. The connection terminal connected to the signal circuit is connected to a predetermined control circuit (not shown), for example, via a flexible board or the like, which is plugged into the circuit connection connector 3 and connected to a ground circuit. The connection terminal is connected to a metal chassis (not shown) to realize ground connection.

The ground connection structure of the card connector 2 having the above-described configuration is employed in portable devices such as an IC recorder that can use a thin card as an external storage medium. And this type of card connector 2 used for such applications has a compact shape such as a width dimension of about 27 to 30 mm, a depth dimension of about 30 mm, and a thickness dimension of about 3 to 4 mm. The card insertion slot faces a card insertion slot formed in the casing of the portable device.
JP 2003-223958 A JP-A-10-255912

  In the conventional card connector 2 described with reference to FIGS. 3 and 4, the card surface potential via the ground contact piece 24 of the frame 21 causes a plurality of soldering locations 25 for surface mounting and the wiring board 1. It is configured to escape to the chassis via a ground pattern, a connection terminal of the circuit connection connector 3, and an electric circuit for ground connection such as a flexible substrate. Therefore, in order to cope with the demand for enhancing the electromagnetic wave shielding function of the frame 21 of the card connector 2 and the demand for enhancing the grounding performance against the increase of the card surface potential, among the electric circuits for the ground connection described above, In particular, it is desirable to take measures to prevent a shortage of capacitance in the ground pattern by increasing the capacitance of the ground pattern of the wiring board 1 that is likely to cause a shortage of capacitance.

  However, in order to increase the capacity of the ground pattern of the wiring board 1, not only is there a problem that the circuit design on the wiring board 1 is required to be modified and the cost increases accordingly, but the ground pattern is widened. If the capacity is increased, it is inevitable that the wiring board 2 will increase in size in accordance with the increase in the area occupied by the ground pattern, and the arrangement of components inside the apparatus will be affected. There is a point.

  In this regard, the technique proposed in the above-mentioned patent document merely improves the relationship between the surface potential of the card and the surface potential of the card connector, so that the above-described problems can be solved. It cannot be a means.

  The present invention has been made in view of the above situation and problems, and in portable devices such as an IC recorder, a liquid crystal portable television receiver, and a small monitor television receiver, the card insertion slot of the card connector includes: Paying attention to the fact that it faces the slot for card insertion formed in the housing of the device, and by taking predetermined measures to the frame of the card connector, without forcing to change the ground pattern of the wiring board An object of the present invention is to provide a card connector ground connection structure capable of enhancing the electromagnetic wave shielding function of the frame of the card connector and enhancing the ground performance against an increase in card surface potential.

  The present invention also provides a ground connection structure for a card connector that can greatly increase the mounting strength of the card connector when the card connector is mounted by soldering its frame to a wiring board. For the purpose.

  A card connector ground connection structure according to the present invention includes a metal frame that forms a card insertion space, and a body that includes a connector side electrode that contacts a card side electrode of the card inserted into the card insertion space. In a ground connection structure of a card connector for a device mounted on a board and housed in a housing, a screw stopper piece formed integrally with the frame is added, and the screw stopper piece is attached to the metal on the housing side. By screwing to the chassis made of steel, the frame is directly grounded to the chassis via a screwing point between the screwing piece and the chassis.

  With this configuration, the screw fixing piece integrated with the frame of the card connector mounted on the wiring board is screwed to the metal chassis on the housing side and directly connected to the chassis, so the wiring board Regardless of whether or not the ground pattern is formed and whether or not the capacity of the ground pattern is excessive or insufficient, the grounding performance against the electromagnetic wave shielding function of the frame and the increase of the card surface potential is improved. . In addition to this, since the mounting strength of the card connector mounted on the wiring board can be greatly increased by screwing the screw fixing piece provided on the frame to the chassis, for example, it is added to the frame when inserting or removing the card. The situation where the soldering part of the frame is peeled off by an external force does not occur.

  In the present invention, the open space on the lower surface formed by the front-view portal-shaped frame including the left and right side plate portions and the top plate portion extending between the side plate portions is the card insertion space, It is possible to adopt a configuration in which the lower surface opening of the surrounding space is closed by the wiring board. According to this, the configuration of the conventional example described with reference to FIGS. 3 and 4 is basically used. As a configuration, it is possible to easily perform modification by adding a screwing piece to the chassis and then screwing the screwing piece to the chassis.

  In the present invention, the screw retaining piece extends from the front ends of the left and right side plate portions of the frame to the left and right outwards, and the screw retaining piece is a metal chassis having a card insertion slot on the housing side. It is desirable to be screwed on both sides of the slot. According to this, the screw fixing piece formed in addition to the frame is selected on both sides sandwiching the slot of the metal chassis having the slot for inserting the card on the housing side as the screw fixing portion. There is an advantage that it is not particularly necessary to add an extra part.

  In the present invention, the frame adopts a configuration in which a plurality of lower end edge portions of the left and right side plate portions are mounted on the wiring board by being soldered to a ground pattern formed on the wiring board. Is also possible. According to this, the grounding performance with respect to the electromagnetic wave shielding function of the frame and the increase of the card surface potential is further enhanced.

  The ground connection structure of the card connector according to the present invention is an open lower surface enclosure formed by a front-view gate-shaped metal frame provided with left and right side plates and top plates extending between the side plates. The space is a card insertion space, and a plurality of lower end edges of the left and right side plate portions of the frame are soldered to a ground pattern formed on the substrate, and are mounted on the wiring board so that the lower surface of the surrounding space A card connector in which an opening is closed by the wiring board, and a body including a connector-side electrode that contacts a card-side electrode of a card inserted into the card insertion space is disposed at the rear end of the surrounding space In this ground connection structure, screw fixing pieces with screw holes extending from the front ends of the side plate portions to the left and right sides are added to the left and right side plate portions of the frame. By screwing the screw stopper piece to the chassis with a metal tightening screw that is superposed in contact with the metal chassis having a card insertion slot on the housing side, screwed into the screw hole, and tightened to the chassis. The present invention is further embodied by adopting a configuration in which the frame is directly connected to the chassis via the overlapping portion between the screw stopper piece and the chassis. The effect | action of this invention is demonstrated in detail with reference to embodiment mentioned later.

  As described above, according to the present invention, since the measure of adding the screwing piece to the frame of the card connector mounted on the wiring board and screwing the screwing piece to the chassis has been taken, There is an effect that it is possible to improve the grounding performance against the electromagnetic wave shielding function by the card connector and the increase of the card surface potential without forcing the change of the ground pattern. In particular, in the case where screw fixing pieces are screwed on both sides of the card insertion slot of the chassis, since it can be screwed without using extra parts other than screw fixing pieces and tightening screws, mass productivity is impaired. There is an advantage that it is not. Moreover, even if the card connector is mounted by soldering the frame to the wiring board, the mounting strength of the card connector is greatly increased by screwing, so it is also excellent for the user. IC recorders, liquid crystal portable television receivers, small monitor television receivers, and the like can be provided.

  FIG. 1 is a schematic plan view showing a ground connection structure of a card connector according to an embodiment of the present invention, and FIG. 2 is a schematic perspective view of the card connector.

  The card connector 2 shown in FIG. 1 or 2 is intended for use with a thin card such as a flash memory as an external storage medium of an IC recorder. For example, the width dimension is about 27 to 30 mm, and the depth dimension is 30 mm. It has a compact shape with a thickness of about 3 to 4 mm. The card connector 2 includes a metal frame 21 and a body 22 made of an electrical insulator, and is surface-mounted on the wiring board 1. More specifically, as shown in FIG. 2, the sheet metal frame 21 includes left and right side plate portions 21a, 21a and a top plate portion 21b extending between the side plate portions 21a, 21a. It is formed into a shape. Further, as can be seen in FIG. 1, a body 22 made of an electrical insulator such as resin is fixed to the rear end of the frame 21, and an electrode (not shown) as a counterpart of a card side electrode (not shown) is attached to the body 22. (Shown). The electrodes include a ground electrode and a signal electrode.

  As shown in FIG. 1, the frame 21 of the card connector 2 is soldered to a ground pattern (not shown) formed on the wiring board 1 at a plurality of lower end edges of the left and right side plate portions 21 a and 21 a. The card connector 2 is surface-mounted on a predetermined portion of the wiring board 1 by soldering. Therefore, an open space S (see FIG. 2) formed by the frame 21 formed in the frontal portal shape is used as a card insertion space, and the closed space S is closed by the wiring board 1. The body 22 is disposed at the rear end of the surrounding space S. In FIG. 1, reference numeral 25 denotes a soldering location.

  In a state where the wiring board 1 having the card connector 2 mounted on the surface thereof is assembled to a device comprising an IC recorder, the front end of the card connector 2, that is, the card insertion slot 26 (see FIG. 2) is connected to the IC as shown in FIG. It faces the slot 51 for card insertion provided in the metal chassis 5 on the recorder housing side at the nearest place. Then, a card (not shown) is inserted as shown by an arrow A through the slot 51 and the card insertion slot 26 of the card connector 2, and when the card is inserted in such a manner, the electrode on the card side becomes the electrode on the body 22 side. To touch. Further, in this card connector 2, a ground contact piece 24 is formed by cutting up and forming on the frame 21, and the ground contact piece 24 is elastically contacted with the surface of the card.

  By the way, in this embodiment, as shown in FIG. 1 or FIG. 2, screw stopper pieces 27, 27 extending outward in the left and right directions are added to the front ends of the left and right side plate portions 21a, 21a of the frame 21 of the card connector 2. It is. These screwing pieces 27 and 27 are formed by punching together with the frame 21 from a sheet metal material and then bending them, and screw holes 28 and 28 are respectively formed in them. Further, since the left and right screw retaining pieces 27, 27 are bent outward at the front ends of the left and right side plate portions 21a, 21a, they are located at locations where they overlap the inner surface of the chassis 5 on both sides of the slot 51. is doing. Then, the overlapping portion of the screw stopper piece 27 and the chassis 5 is firmly screwed by the metal tightening screw 6 that is inserted into the screw insertion hole provided in the chassis 5 and screwed into the screw hole 28 and tightened. Yes. By adopting this configuration, there is an advantage that it is not particularly necessary to add extra parts for screwing in addition to the screwing pieces 5 and the fastening screws 6. In FIG. 1, reference numeral 3 denotes a circuit connector (see FIG. 3).

  According to the card connector installation and connection structure configured as described above, the frame 21 of the card connector 2 is directly connected to the chassis via the overlapping portion of the screw stopper piece 27 and the chassis 5. Even if the capacity of one ground pattern is insufficient, the electromagnetic wave shielding function of the frame 21 and the grounding performance against the increase in card surface potential are enhanced regardless of this. Therefore, even when it is required to improve the installation performance, it is not necessary to take measures to reinforce the ground pattern of the wiring board 1 and increase its capacity. In addition, the mounting strength of the frame 21 of the card connector 2 mounted on the wiring board 1 is greatly increased by screwing the screw retaining pieces 27 to the chassis 5, and as a result, for example, card insertion / extraction There is no possibility that the soldering portion 25 of the frame 21 may be peeled off due to an external force applied to the frame 21 sometimes.

  In this embodiment, since the electric circuit for ground connection is secured by the screwing portion between the screwing piece 27 and the chassis 5, the ground pattern of the wiring board 1 is selected as the soldering portion of the frame 21 of the card connector 2. You don't have to. Moreover, the screwing piece 27 may be provided only on one side of the left and right side plate portions 21 a and 21 a and the screwing piece 27 may be screwed to the chassis 5.

It is the schematic plan view which showed the ground connection structure of the card connector which concerns on embodiment of this invention. It is a schematic perspective view of a card connector. It is a top view of another prior art example. FIG. 4 is a side view of FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wiring board 5 Chassis 6 Tightening screw 21 Frame 21a Side plate part 21b Top plate part 22 Body 23 Electrode (connector side electrode)
25 Soldering point 27 Screw fixing piece 28 Screw hole 51 Slot S

Claims (5)

An open space surrounded by a frontal gate-shaped metal frame including left and right side plate portions and a top plate portion extending between the side plate portions is a card insertion space, and the frame. A plurality of locations at the lower edges of the left and right side plate portions are soldered to a ground pattern formed on the substrate so that the lower surface opening of the surrounding space is blocked by the wiring substrate. In addition, in the ground connection structure of the card connector, a body including a connector side electrode that contacts the card side electrode of the card inserted into the card insertion space is arranged at the rear end of the surrounding space.
Screw fixing pieces with screw holes extending from the front ends of the side plate portions to the left and right sides of the frame are integrally added to the left and right side plate portions of the frame, and the screw fixing pieces are used as slots for card insertion on the housing side. The frame is attached to the chassis by a metal fastening screw that is overlapped in contact with the metal chassis and screwed into the screw hole and fastened to the chassis. A card connector ground connection structure, wherein the card connector is directly grounded to the chassis. A card connector having a metal frame forming a card insertion space and a body having a connector side electrode that contacts a card side electrode of the card inserted into the card insertion space is mounted on a substrate and accommodated in a housing In the ground connection structure of the card connector for the equipment
The screw fixing piece integrally formed on the frame is added, and the screw fixing piece is screwed to the metal chassis on the housing side, so that the frame passes through the screw fixing portion between the screw fixing piece and the chassis. The card connector ground connection structure is characterized in that it is directly grounded to the chassis. An open space on the lower surface formed by the front gate-shaped frame including left and right side plate portions and a top plate portion extending between the side plate portions is the card insertion space, and the lower surface of the surrounding space. 3. The card connector ground connection structure according to claim 2, wherein the opening is closed by the wiring board. The screw stopper piece extends outward from the front end of the left and right side plate portions of the frame, and the screw stopper piece sandwiches the slot in a metal chassis having a card insertion slot on the housing side. 4. The ground connection structure for a card connector according to claim 3, wherein screws are screwed on both sides. 5. The frame according to claim 3, wherein the frame is mounted on the wiring board by soldering a plurality of lower edge portions of the left and right side plate portions to a ground pattern formed on the wiring board. Card connector ground connection structure.

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