JP3703823B2 - card - Google Patents

Description

  The present invention relates to a card such as a memory card, and more particularly to a static electricity countermeasure structure for an electronic component such as an IC chip mounted on a printed circuit board.

  FIG. 5 is an exploded perspective view of a memory card according to a conventional example described in, for example, Patent Document 1 and Patent Document 2 described later. This memory card is a two-piece type using a connector. 1 is a printed circuit board, 2 is an IC chip mounted on the printed circuit board 1, and 3 is a connector having 36 to 80 pins. It is attached to one end.

  Reference numeral 4 denotes a metal upper name plate bordered by a resin frame 5, and 6 denotes a metal lower name plate. The memory card is inserted between the upper name plate 4 and the lower name plate 6 so that the printed circuit board 1 is sandwiched between them. Composed. The frame 5 has a function of supporting the printed circuit board 1 and the connector 3.

  By the way, in such a memory card, there is a possibility that the IC chip 2 mounted on the printed circuit board is destroyed due to static electricity from the outside and the memory function is lost, and it is necessary to take measures against static electricity.

Conventionally, as a countermeasure against static electricity, a hole or a concave portion is provided in the ground terminal portion of the printed circuit board 1, and a coil spring 8 protrudes from the upper and lower surfaces of the printed circuit board 1 in the hole or the concave portion, respectively. A static electricity release mechanism is employed in which the upper and lower protruding portions of the coil spring 8 are elastically contacted with the upper name plate 4 and the lower name plate 6.
JP 61-258798 A JP-A-4-10295 Japanese Patent Laid-Open No. 5-282507 Japanese Patent Laid-Open No. 4-153096 JP-A-5-221191

However, in the above conventional device,
(1) Coil springs must be provided, the number of parts increases, and assembly work becomes complicated.
(2) The coil springs are entangled during the assembly process, which becomes an obstacle during automatic loading.
(3) The coil spring is easily detached from the printed circuit board (especially in the case of a recessed portion),
(4) The coil spring was crushed (deformed) and contact with the nameplate was likely to be uncertain.

  In order to eliminate such drawbacks, conventionally, for example, an IC card as described in Patent Document 3 has been proposed prior to the present invention. 6 and 7 are diagrams for explaining the IC card, FIG. 6 is a partially exploded perspective view of the IC card, and FIG. 7 is a sectional view of the IC card.

  As shown in FIG. 7, this IC card has a frame 100, a pair of metal nameplates 101 and 102 sandwiching the frame 100, and a space between the nameplates 101 and 102 and an IC chip 103 and the like mounted thereon. The printed circuit board 104 and the connector 106 having a large number of connection terminals 105 disposed on the front side of the printed circuit board 104 are mainly configured.

  The four connection terminals 105 located on both sides of the plurality of connection terminals 105 form an extension part 105 a extending in the direction of the printed circuit board 104, and the extension parts 105 a are curved in a direction facing each other to form the extension of the printed circuit board 104. A ground pattern 107 (see FIG. 6) formed on both upper and lower surfaces is sandwiched and electrically connected to the ground pattern 107.

  The other connection terminals 108 paired with these four connection terminals 105 have extension portions 108a extending in the direction of the upper and lower name plates 101 and 102 and curved in the vertical direction, respectively, and when the IC card is assembled. As shown in FIG. 7, they are in contact with the inner surfaces of the name plates 101 and 102 and are electrically connected to the name plates 101 and 102.

  Therefore, when this IC card is inserted into the card reader / writer, the connector pin on the reader / writer side is inserted between the pair of upper and lower connection terminals 105 and 108 and contacts both. For this reason, the nameplates 101 and 102 are electrically connected to the ground pattern 107 via the connection terminals 108, connector pins, and connection terminals 105, and countermeasures against static electricity are taken.

  However, as is apparent from FIG. 6, the extension 108 a of the connection terminal 108 is outside the connection terminal 105, extends in a free and unstable state from the rear end of the connector 106, and bends in the vertical direction. ing. For this reason, the extension part 108a may come into contact with other members during the assembly of the IC card or the like, or the extension parts 108a may be entangled to bend inwardly or bend in an oblique lateral direction.

  If the extension portion 108a is incorporated in the IC card while being bent excessively inside, the contact with the nameplates 101 and 102 is not made or the contact becomes unstable, and the reliability of the countermeasure against static electricity is lowered. Even if the extension portion 108a is not bent excessively before installation, the extension portion 108a is free when the extension portion 108a is pressed and deformed by the name plates 101 and 102, and the pressure deformation is not caused by anyone. Since it is not regulated, it may be bent excessively, resulting in poor contact.

  Further, when the extension portion 108a is bent obliquely in the horizontal direction, it comes into contact with other connection terminals 105 and causes various troubles. This contact accident occurs more remarkably when the number of connection terminals 105 in the connector 106 increases and the pitch between the connection terminals 105 becomes narrower.

  Further, if the extension portion 108a is bent in the lateral direction, when the extension portion 108a is pressed and deformed by the nameplates 101 and 102, the tip of the extension portion 108a comes into contact with the conductive pattern or the electronic component on the printed circuit board 104, thereby causing various troubles. Arise. This contact accident is particularly likely to occur if the IC card is made thinner and the distance between the printed circuit board 104 and the extension 108a is narrowed. For this reason, it is an obstacle to increase the number of pins of the connector 106 and to make the IC card thinner.

  Further, when the extension portions 105a of the connection terminals 105 are soldered to the printed circuit board 104, the extension portions 108a are present in the vicinity of the extension portions 105a. Bring In order to solve this problem, if the extension portion 108a is further extended inside the printed circuit board 104, the mounting area of other electronic components and conductive patterns on the printed circuit board 104 is reduced, which is not preferable. .

  Other applications related to this include, for example, Patent Document 4 and Patent Document 5, and the IC cards according to these proposals have the same drawbacks as described above.

  An object of the present invention is to provide a highly reliable card that can solve the drawbacks of the prior art and can take a sure countermeasure against static electricity.

To achieve the above object, the present invention provides, for example, a printed circuit board on which an electronic component including a memory element (IC chip) is mounted,
A predetermined number of connector pins are arranged in the connector frame, and a connector attached to the printed board,
In a card comprising a conductive plate such as a metal thin plate (name plate) disposed in contact with the upper or lower surface of the connector frame,
A protruding piece protruding from the upper surface or the lower surface of the connector frame toward the conductive plate is formed on the ground pin connected to the ground pattern of the printed circuit board among the connector pins,
The protruding piece and the conductive plate are in elastic contact with each other in a state where the conductive plate is disposed in contact with the connector frame.

According to the present invention, it is possible to eliminate a spring and take a certain countermeasure against static electricity, and to improve reliability.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view of a memory card according to an embodiment, FIG. 2 is an enlarged vertical sectional view of a main part of the memory card, FIG. 3 is an enlarged perspective view of a connector pin used in the memory card, and FIG. It is an expansion perspective view of the principal part.

The connector 3 is joined to the printed circuit board 1 as shown in FIG. 1 and FIG. 4. In the region 9f, through holes 9a are formed above and below the portion corresponding to the ground pin 10 of the connector pins. From this through hole 9a, a protruding piece 10a formed on the top and bottom of the ground pin 10 partially protrudes from the outer surface 9c of the connector frame 9, and as shown in FIG. 4, both base side ends 10b, 10b of the protruding piece 10a are The both side walls 9b and 9b of the through hole 9a are in close proximity to each other. In FIG. 3, reference numeral 10 b denotes a locking piece for preventing the ground pin 10 from coming off in the connector frame 9.

  Therefore, when the connector frame 9 is sandwiched between the upper name plate 4 and the lower name plate 6, the protruding piece 10 a is pressed and deformed inside the through hole 9 a by the upper name plate 4 and the lower name plate 6 and is elastically attached to the lower name plate 4 and the lower name plate 6. Since it touches the nameplate 6, static electricity from the outside flows from the ground pin 10 to both nameplates 4 and 6, and a certain countermeasure against static electricity is taken.

  Even if only one of the name plates 4 and 6 is made of metal and the through hole 9a and the protruding piece 10a are formed only on that side, the same effect can be obtained. When there are a plurality of ground pins of the connector, it is not necessary to project the protruding pieces up and down, and the protruding piece of one ground pin can protrude upward and the other ground pin can protrude downward.

1 is an exploded perspective view of a memory card according to an embodiment of the present invention. It is an expanded vertical sectional view of the principal part of the memory card. It is an expansion perspective view of the connector pin used for the memory card. It is an expansion perspective view of the principal part of the memory card. It is a disassembled perspective view of the memory card based on a prior art example. It is a partial exploded perspective view of a conventionally proposed IC card. It is sectional drawing of the IC card.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printed circuit board 2 IC chip 3 Connector 4 Upper nameplate 4a Protruding part 5 Frame 6 Lower nameplate 6a Protruding part 9 Connector frame 9a Through hole 9b Side wall of through hole 9c Outer surface of connector frame 9d Printed board side edge part 9e Opposite edge part 10 Ground pin 10a Protruding piece 10b Root end of protruding piece

Claims (1)

A printed circuit board on which electronic components are mounted;
A predetermined number of connector pins are arranged in the connector frame, and a connector attached to the printed board,
In a card provided with a conductive plate disposed in contact with the upper or lower surface of the connector frame,
A protruding piece protruding from the upper surface or the lower surface of the connector frame toward the conductive plate is formed on the ground pin connected to the ground pattern of the printed circuit board among the connector pins,
The card, wherein the protruding plate and the conductive plate are in elastic contact with the conductive plate in contact with the connector frame.

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