JPH11162587A - Card edge connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a card edge connector which has the small mounting area in a small type and can minimize a dimension of a acceptance part of a circuit board to be accepted. SOLUTION: A card edge connector 10 has a contact 50 to constitute a lower side row in a circuit board receiving recessed part 21 and a contact 90 to constitute an upper side row. The contact 50 has a press-in beam 55, and is fixed to a housing 20 by pressing in the beam 55 from the bottom surface 23 side of the housing 20. The beam 55 is pressed in the housing 20 in the rear of the circuit board receiving recessed part 21. An elastic arm 52 to contact with a circuit board received in the circuit board receiving recessed part 21 extends from the beam 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a card edge connector, and more particularly to a card edge connector used as a socket for receiving a circuit board on which a semiconductor device such as a memory device is mounted.

[0002]

2. Description of the Related Art An example of this type of card edge connector is disclosed in Japanese Utility Model Laid-Open No. 7-36381. The card edge connector has a lower row of contacts having contact points relatively forward in a circuit board receiving recess of the housing and an upper row of contacts having contact points relatively rearward. The circuit board inserted into the circuit board receiving recess is received between the contact points of the lower row and the upper row of contacts, and then is slightly rotated to be elastically pinched between the arms of the lower row and the upper row of contacts. And are electrically connected to the respective contacts.

[0003]

However, there is a need for this type of connector to have a smaller overall size and a smaller footprint. Also, in a circuit board on which a semiconductor device such as a memory device to be received by a card edge connector is mounted, it is desired to minimize the area and to effectively use the circuit board. It is required that the portion received by the connector be smaller. This includes the characteristic advantage that the wiring length on the circuit board to be received can be further reduced. An object of the present invention is to provide a card edge connector satisfying these requirements. In the configuration of the card edge connector disclosed in the above-mentioned publication, the requirements for minimizing dimensions, minimizing the mounting area, and further reducing the size of the portion of the circuit board that is received by the card edge connector are satisfied. A reliable electrical connection with the substrate cannot be realized.

That is, an object of the present invention is to provide a card edge connector which is small in size, has a small mounting area, and can minimize the size of a receiving portion of a circuit board to be received.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a lower row of contacts having contact points relatively forward in a circuit board receiving recess of a housing and an upper row of contacts having contact points relatively rearward. The circuit board received in the circuit board receiving recess is sandwiched between the contact points of the contacts in the lower row and the upper row by respective arms including the contact points, and is elastically urged to electrically connect. In the card edge connector, the lower row of contacts is provided with a beam extending in a press-fit direction, which is press-fitted from a direction perpendicular to the circuit board receiving recess with respect to the housing behind the circuit board receiving recess. And wherein the arm is configured to extend from the beam.

[0006] Preferably, the card edge connector is mounted on a parent circuit board, and the circuit board receiving recess is disposed so as to be substantially parallel to the parent circuit board.

[0007] Preferably, each of the contacts in the lower row extends from the position apart from the arm of the beam to the same side longer than the arm, and has a board connecting tine having a surface mount type connection near the tip. Have.

[0008] Preferably, an alignment portion is formed near the connection portion and is engaged with the vicinity of the front end of the housing.

[0009] Preferably, the positioning portion includes a fixed wall and a deformable piece placed at positions sandwiching the upright wall of the housing. The upright wall may be formed with a concave portion that engages with a protrusion provided on the deformable piece.

Preferably, the tines extend from the lower end of the beam.

Preferably, the arm extends from the beam in a horizontal direction or at a slight inclination, and extends from the intermediate position to a steep inclination to reach the circuit board receiving recess.

Preferably, the contacts in the upper row are press-fitted and fixed to the housing from behind the housing. The press-fit tongues of the upper row of contacts may be located so as not to overlap the beam of the lower row of contacts.

Preferably, a side edge of the beam opposite to the side where the arm and the tine extend is configured to substantially contact the housing over a length direction.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a card edge connector according to the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1A and 1B are views showing a card edge connector according to the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a front view.

The card edge connector 10 of the present invention has an outer shape similar to that of other card edge connectors disclosed or known in the above-mentioned publications, includes an elongated housing 20 and a pair of latch members 30, and has a substantially U-shape. Shaped. FIG.
As shown in FIG. 2A, the card edge connectors 10 are arranged in rows so that the contacts 50, 90 extend the tines 51, 91 before and after the elongated housing 20 in the longitudinal direction thereof. . According to FIG. 1B, a substantially elongated rectangular circuit board receiving recess 21 for receiving a circuit board (not shown) is formed on the front side of the housing 20, that is, on the mating surface side, and the contacts 50 and 90 are provided on the circuit board. It includes elastic contact pieces 52 and 92 projecting into the receiving recess 21. The shapes of the elastic contact pieces 52 and 92 will be described later. According to FIGS. 1A and 1B, the latch member 30 protruding from the vicinity of both side ends of the housing 20 is soldered to be fixed to a parent board (not shown) on which the card edge connector 10 is mounted. The card edge connector 10 integrally includes a connection portion 31 and a latch portion 32 for preventing a circuit board (not shown) received by the card edge connector 10 from coming off from the card edge connector. The latch member 30 can be formed by processing a metal plate. A configuration similar to this card edge connector is disclosed in Japanese Patent Laid-Open No. 9-824.
No. 29.

FIG. 2 is a partial sectional view taken along the line AA in FIG. 1B.

FIG. 3 is a partial cross-sectional view taken along line BB in FIG. 1B.

The improvement according to the invention is mainly due to the housing 20
And the shape and arrangement of the contacts 50, 90 contained therein. Next, the details will be described with reference to FIGS.

As can be seen from FIG.
The contacts 50 extending the tines 51 to the front of the zeros are the lower row of contacts including the resilient arms 52 including the lower contact points 53 in the circuit board receiving recess 21. Contact 50
Is a cavity 2 extending from the bottom surface 23 of the housing 20 in a height direction substantially orthogonal to the circuit board receiving recess 21.
2 has a press-fitting beam 55 that is press-fitted into the inside. Therefore,
The beam 55 extends in the height direction of the housing 20 and is fixed. The beam 55 has a press-fit portion 54 near its end.
The press-fit portion 54 includes a press-fit protrusion 54 a along the front edge of the beam 55 near the circuit board receiving recess 21. Beam 55
The rear side edge is placed so as to substantially contact the inner surface of the cavity 22 beyond the press-fit portion 54 to a position near the lower end. As illustrated, the tines 51 extend substantially horizontally forward from the lower end position of the press-fitting beam 55. Therefore, the lower edge of the beam 55 and a part of the tine 51 can be used as a press-fit pressing shoulder. Further, the arm 52 extends forward from a position above the tine 51 as in the case of the tine 51. As can be understood from the above description, the rear edge of the beam 55 substantially contacts the inner surface of the cavity 22 even at the height position where the arm 52 extends. As shown, the arm 52 has a first portion 52a extending substantially horizontally or at a slight inclination from the beam 55, and a second portion 52b which is steeply inclined at its free end. The contact point 53 located in the circuit board receiving recess 21 is the second contact point.
It is provided in the portion 52b. Since the arm 52 extends from the position of the beam 55 to the circuit board receiving recess 21, the arm 52
Can be configured to have sufficient elasticity.

As shown, the tines 51 extend forward substantially parallel to the bottom surface 23 of the housing 20 and have a surface mount type connection 56 near the end thereof. The connection part 56 is located along the bottom surface 23 of the housing 20. In addition, a positioning portion 57 that engages with the front wall 24 of the housing 20 is provided near the connection portion 56. The alignment portion 57 provides sufficient coplanarity to the tines 51 of the lower row of contacts 50,
This is to obtain high connection reliability between the contact and the parent circuit board on which the card edge connector 10 is mounted.
The positioning part 57 is composed of an inner fixed wall 58 and an outer deformable piece 59, between which a recess 61 is defined. The front wall 24 of the housing 20 is located in the recess 61 and sandwiched between the fixed wall 58 and the deformable piece 59, and the bottom end 24 a of the front wall 24 abuts the bottom edge of the recess 61. On the front side of the front wall 24, a concave groove (or concave portion) 25 that can be engaged with the projection 59a provided on the deformable piece 59 is formed. Note that the deformable piece 59 may be elastically engaged with the front wall 24 of the housing 20, or may be configured to be engaged with the above-described concave groove 25 by plastic deformation.

As can be seen from FIG.
The contacts 90 extending the tines 91 to the rear side of the 0 are upper rows of contacts including the elastic arms 92 including the upper contact points 93 in the circuit board receiving recess 21. As understood with reference to FIGS. 1B, 2 and 3, the upper row of contacts 90 and the lower row of contacts 50 are staggered so as to be vertically displaced.

The contact 90 is provided on the rear surface 2 of the housing 20.
6, an elastic arm 92 having a press-fit tongue 94 in the center and a forwardly extending elastic arm 92 at an upper position.
Having. The tongue piece 94 which is pressed into the housing 20 in a substantially horizontal direction is fixed at a position where the tongue piece 94 does not overlap the cavity 22 into which the beam 55 of the contact 50 is pressed (see FIG. 2). As described above, the arm 92 has a contact point 9 near its end located in the circuit board receiving recess 21 of the housing 20.
3 inclusive. Contact point 5 of contact 50 as shown
It should be noted that the contact point 93 of the contact 90 is located relatively on the upper rear side, while 3 is located relatively on the lower front side in the circuit board receiving recess 21. As shown, the tines 91 of the contacts 90 extend slightly further back from the rear surface 26 at the bottom surface 23 of the housing 20. It should be noted that the base 95 extending in the height direction extending the tines 91 and the arms 92 is partially supported by the rear groove 27 of the housing 20 over the length thereof.

The circuit board B is first inserted obliquely into the circuit board receiving recess 21 as shown by a broken line in FIG. 3, and then rotated in the direction of arrow R to a position substantially horizontal. The rotated circuit board B is locked and fixed to the latch member 30 shown in FIG. At this time, the circuit board B electrically contacts the contact points 93 and 53 of the contacts 90 and 50 on the upper and lower surfaces, respectively. The contact pressure of each contact 50,
90 provided by the elastic force of the arms 52, 92.

As described above, the card edge connector according to the preferred embodiment of the present invention has been described. However, this is merely an example, and does not limit the present invention. Various modifications and changes may be made by those skilled in the art. It is possible.

[0026]

According to the card edge connector of the present invention, the lower row of contacts extends in the press-fitting direction in which the lower row of contacts is pressed into the housing from the direction perpendicular to the circuit board receiving recess with respect to the housing. Including the beam,
Since the arm is configured to extend from the beam, a card edge connector which is small in size and has a small mounting area is provided. Sufficient elasticity can be provided, and a highly reliable connection with the circuit board is realized. Further, according to the card edge connector of the present invention, the size of the receiving portion of the circuit board to be received can be minimized, and the length of the extra circuit wiring that deteriorates the characteristics can be shortened.

[Brief description of the drawings]

FIG. 1 is a view showing a card edge connector according to the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 2 is a partial cross-sectional view taken along line AA in FIG. 1 (b).

FIG. 3 is a partial cross-sectional view taken along line BB in FIG. 1 (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Card edge connector 20 Housing 21 Circuit board receiving recess 50 Lower row of contacts 52 Arm 53 Contact point 55 Beam 90 Contact 92 Arm 93 Contact point

Claims (1)

[Claims] The circuit board receiving recess has a lower row of contacts having a contact point at a relatively forward position in a circuit board receiving recess of the housing and an upper row of contacts having a contact point relatively at a rearward position. A card edge connector in which a circuit board to be received is elastically biased and electrically connected between the contact points of the lower row and the upper row of contacts by the respective arms including the contact points. Wherein the lower row of contacts includes a beam extending in a press-fit direction that is press-fitted from the direction perpendicular to the circuit board receiving recess with respect to the housing at a position rearward of the circuit board receiving recess, and the arm is separated from the beam by the beam. A card edge connector configured to extend.