JP4231499B2 - connector - Google Patents

Description

  The present invention belongs to the technical field of a double-sided connector for connecting a PWB (Printed Wiring Boad) to a component having a large number of alignment electrodes such as a BGA (Ball Grid Arrdy) chip.

  Conventionally, as a double-sided connector, a contact connector 15 as shown in FIG. 4B is press-fitted into the housing hole 17 of the frame 16 as shown in FIG. 4C, and further, as shown in FIG. There is one that holds the contact connector 15 by attaching a single-sided adhesive tape 19 from the lower surface to the single-sided adhesive tape 18 from the upper surface.

  The contact coupling body 15 in (b) has a shape in which the projections 20 and the constricted portions 21 are alternately connected with a highly flexible insulating material such as rubber or gel, and the surface of the projection 20 is electrically conductive. The conductive film 22 is formed by means such as sputtering. Protrusions 23 as shown in (e) are provided on the back surface of some constricted portions 21. The thickness in the front-rear direction including the protrusion 23 is larger than the width of the storage hole 17.

  FIG. 5 is a side sectional view in which the contact connecting body 15 is press-fitted into the housing hole 17 of the frame body 16 and the adhesive tapes 18 and 19 are attached from the upper surface and the lower surface. By press-fitting, the projection 23 of the constricted portion 21 is held in the storage hole 17 by the compressed reaction. However, when an external force greater than the holding force is applied, there is a possibility that it will be displaced or removed in the vertical direction. To prevent this, the single-sided adhesive tape 18 as shown in FIGS. 4 (a) and 4 (d). , 19 are pasted.

The protrusion 20 provided with the conductive film 22 protrudes from the single-sided adhesive tapes 18 and 19 on the upper surface and the lower surface, and elastically contacts the counterpart contact portions on the upper surface side and the lower surface side, respectively ( For example, see Patent Document 1).
Japanese Patent Application No. 2004-33429 (FIGS. 1 to 5)

As described above, the conventional connector for double-sided connection presses the contact coupling body with protrusions into the housing hole of the frame body , and further contacts the contact surface with the other party where the conductive film of the contact coupling body is provided. One side adhesive tape must be affixed to the upper and lower surfaces. Therefore, at the time of press-fitting, the position of the housing hole of the frame and the position of the contact protrusion must be matched using a jig so that the protrusion can smoothly enter.

Further, when the adhesive tape is affixed, it is necessary to affix it with high positional accuracy using a jig since it will be applied to the conductive film unless it is aligned accurately.
For this reason, there are problems that work man-hours are required and the cost of the adhesive tape is high.

  In addition, since the pressure is pressed and the frame is held by the adhesive tape, it is natural that the contact cannot be floated on the frame. Therefore, there is a problem that, in use, variations in ball co-polarity (ball height) of the BGA chip cannot be absorbed, and PWB and chip warpage are not sufficiently absorbed.

  In view of the above-mentioned problems of the prior art, the present invention does not require a positioning jig for assembly, and does not require a separate part for retaining such as an adhesive tape. It is an object of the present invention to provide a double-sided connection connector in which a contact is in a floating state and is held so as not to come off.

In order to solve the above problems, the present invention has the following configurations.
According to a first aspect of the present invention, there is provided a connector having the following insulating sheet (A) and connecting contact (B).
( B) Insulation sheet (b) where the connecting contact of (b) penetrates and the inner wall has a straight through hole (b) A rubber contact that penetrates the through hole, and both ends of the through part are bent. The bent portion is a contact head having an electrical contact surface with the other circuit contact portion, and both contact heads are from one contact head top surface to the other contact head. It is electrically connected to the top surface by a metal film provided on the rubber surface, and the size of the contact head is larger than the width of the through slot and prevents the through slot from passing through. The width direction dimension is smaller than the width dimension of the through hole and the length of the penetration part is larger than the thickness dimension of the insulating sheet, and a plurality of floating contacts are connected in a straight line while maintaining insulation. contact

The second aspect of the present invention, Oite the first configuration, the connection contacts of the through long hole of the insulating sheet (A) is provided parallel plural rows, the respective through slots in the plurality of (b) It is a connector characterized by having penetrated .

A third configuration of the present invention is a connector characterized in that a plate-like insulator is used instead of the insulating sheet of the first configuration or the second configuration.

In the first configuration of the present invention, the connection contact is a rubber contact. The rubber includes natural rubber, synthetic rubber, and other highly flexible materials such as gel. With such a material, it is comprised by the penetration part and the contact head of the both ends.
The size of the contact head is greater than the width of the elongate through-holes, since a material having flexibility, the through-length by pulling its one or so as to compress pushed into the through long hole from the opposite side Since the hole can be removed and returns to its original size when it is completely removed, the penetrating part penetrates the through long hole , and its both ends are larger than the width of the through long hole , so that it functions as a retainer become. And since the dimension of a penetration part is smaller than the width dimension of a penetration long hole , and the length of a penetration part is a dimension larger than the thickness dimension of an insulating sheet, a contact is hold | maintained so that floating is possible.

  As described above, in the connector of the present invention, the contact has no protrusion for holding after press-fitting as in the prior art, and there is no sticking of an adhesive tape for holding, for accurate alignment. There is an advantage that it contributes to cost reduction without the need for jigs and labor.

  Further, since the contact is held so as to be floatable with respect to the insulating sheet, it is possible to absorb variations in ball co-polarity (ball height) of the BGA chip, and further, it is possible to absorb PWB and chip warpage.

The second configuration is a double-sided connector suitable for the case where the balls of the BGA chip and the electrode pads of the PWB are arranged in a planar matrix because the plurality of rows of the first configuration are provided. There is an advantage that can be obtained.
Since the thing of a 3rd structure replaced with the insulating sheet and was used as the plate-shaped insulator, there exists an advantage that the attitude | position retainability of a contact improves more.

The shape of the contact consists of a penetrating part and contact heads at both ends, and various shapes are conceivable, but if the electrical contact surface of the contact head tries to obtain good contact with the other party, It is best that the surface is parallel to the surface of the insulating sheet or plate-like insulator, and therefore the surface of the contact head is also parallel.
The penetrating portion that connects the two contact heads is best to be linear because the contact floating is best in the axial direction of the through hole.

The size of the contact head needs to be larger than the size of the through hole in order to provide a retaining function. To make it easier to push or pull the contact into the through hole during assembly, One is L-shaped and the other is inverted L-shaped, that is, it is best to have a U-shaped shape as a whole.
Further, the cross section of the penetrating portion is best to be square in view of attaching the connected ones to the long holes.

The connector of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a connection contact in which a plurality of contacts are connected, a situation where the contacts are attached to the through holes of the insulating sheet, and a state where the contacts are attached.
The base material of the connecting contact is rubber. This rubber includes a highly flexible insulating material such as natural rubber, synthetic rubber, gel and the like. The shape is a front view, (b) is a bottom view of the structure of (a) seen from below, and (c) is a side view of the structure of (a) seen from the right. The rubber 2 has a structure in which irregularities are repeated in the longitudinal direction when viewed in the front view of (a), and a metal film 3 is formed on the surface of the convex portion. The metal film can be formed by a plating method, an additive method, metal powder spraying, a sputtering method, or the like.

  The recess is an independent groove that separates each contact. The side cross section of the convex part is U-shaped as shown in (c). Production of the U-shaped rubber includes injection molding. The top surfaces of the upper and lower contact heads 6 are flat, the metal film 3 is formed from one top surface to the other top surface, and the top surfaces are electrically connected. Become.

  In FIG. 1 (d), the contact on the right side is drawn obliquely, which is a view in which the contact is about to be inserted into the through hole 8 of the insulating sheet 5, and the other is a state diagram in which the contact has been completed. The insulating sheet may be a film (tape) or a plate-like insulator that is slit by additional machining or manufactured by injection molding.

  Since the size of the contact head of the contact is larger than the dimension of the through-hole 8, if the contact is a rigid body, it cannot be fitted. However, since the contact of the present invention is made of rubber, it is flexible and flexible. Yes, compression is possible. Accordingly, it is possible to easily insert a tool such as tweezers from the lower side of the through hole 8, pull the contact head 6 of the contact into the through hole 8, and take it out downward.

Since the contact head 6 coming out of the through hole returns to its original size, it is in a holding state like the other contacts in FIG. The contact can be moved up and down because the size of the contact through portion 7 is smaller than the size of the through hole 8. It has a stopping function and will not come out unless it is forcibly pulled. Accordingly, it is possible to float (floating) by the length of the through portion 7 longer than the length of the through hole 8 (thickness of the insulating sheet).

In such assembling, there is an advantage that there is no need for alignment as in the conventional press-fitting and no jig for that is required, and it is easy to assemble with a simple tool and does not require man-hours.
Moreover, since it is not affixed with an adhesive tape, the number of parts is small and it contributes to low cost.

FIG. 2A shows this floating state.
FIG. 2B is a diagram showing a state in which the electrical contact surface of the contact head of the contact is placed on the electrode pad 10 of the PWB 9. (C) is a figure which shows the state which pressed the BGA chip | tip 11 from the top with respect to the state of (b).
The PWB 9, the connector of the present invention, and the BGA chip 11 are positioned so that the solder balls 12 of the BGA chip 11 abut on the electrical contact surface on the upper side of the contact. The three members are aligned and held in contact by ordinary means not shown. Since the rubber of the contact is compressed by the pressing, the height of the contact is lower than in the case of (b), and the penetrating portion is slightly Σ-shaped.

  By the restoring force that the deformed rubber tries to return to the original shape, reliable electrical contact between the electrical contact surface of the contact and the electrode pad 10 and the solder ball 12 is obtained. Since the upper and lower electrical contact surfaces are electrically connected by the metal film 3, the corresponding electrode pads 10 and solder balls 12 are electrically connected.

  In FIGS. 2B and 2C, the PWB 9 is warped, the electrode pad 10 is not uneven in height, the BGA chip is not warped, and the solder balls are not varied. Even if there is a warp or the like, these can be sufficiently absorbed by the floating structure in contact holding and the elasticity of the contact itself.

FIG. 3 is a plan view of the insulating sheet 5 (or plate-like insulator) provided with a plurality of through holes 8 (10 in the figure) and the connecting contacts 1 fitted into the through holes 8. In the three left through holes 8, no connection contacts are drawn to show the shape of the holes.
With such a configuration, a double-sided connector having a large number of electrical contact surfaces arranged in a matrix is obtained. In addition, the AA arrow line view of FIG. 3 becomes (d) of FIG. 1 in which the contact at the right end is also properly fitted.

It is a figure which shows the contact of this invention connector, the condition which this contact mounts to the through-hole of an insulating sheet, and the mounted state. It is a figure which shows the floating state of the contact of this invention connector, the state which contacted the electrode pad of PWB, and the state which pressed the BGA chip | tip further from the top. FIG. 5 is a view showing an example of the connector according to the present invention, in which a plurality of long through holes are provided in an insulating sheet, and connection contacts are fitted into each of the insulating sheets, and electrical contact surfaces are arranged in a matrix. It is an assembly perspective view of the conventional double-sided connector. FIG. 5 is a cross-sectional view showing a state where the contact coupling body is press-fitted into the housing hole of the frame body and single-sided adhesive tape is attached from both the upper and lower surfaces in the connector of FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection contact 2 Rubber | gum 3 Metal film 4 Independent groove 5 Insulation sheet 6 Contact head 7 Through part 8 Through hole 9 PWB
DESCRIPTION OF SYMBOLS 10 Electrode pad 11 BGA chip 12 Solder ball 15 Contact connecting body 16 Frame 17 Storage hole 18 Single-sided adhesive tape 19 Single-sided adhesive tape 20 Protrusion 21 Constriction 22 Conductive film 23 Protrusion

Claims (3)

A connector having the following (A) insulating sheet and (B) connecting contact.
( B) Insulation sheet (b) where the connecting contact of (b) penetrates and the inner wall has a straight through hole (b) A rubber contact that penetrates the through hole, and both ends of the through part are bent. The bent portion is a contact head having an electrical contact surface with the other circuit contact portion, and both contact heads are from one contact head top surface to the other contact head. It is electrically connected to the top surface by a metal film provided on the rubber surface, and the size of the contact head is larger than the width of the through slot and prevents the through slot from passing through. The width direction dimension is smaller than the width dimension of the through hole and the length of the penetration part is larger than the thickness dimension of the insulating sheet, and a plurality of floating contacts are connected in a straight line while maintaining insulation. contact 2. The connector according to claim 1, wherein the through-holes of the insulating sheet of (a) are provided in parallel in a plurality of rows, and the connection contacts of (b) pass through the plurality of through-holes . A connector having a plate-like insulator instead of the insulating sheet according to claim 1 .

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