JP2007059219A - Connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connector for double side connection of which a contact is held so as not to fall-off in a state of floating against a contact holder, not requiring jig or another parts for positioning at assembly. <P>SOLUTION: The contact made of rubber having contact head parts 6 arranged at both ends with a size larger than a diameter of a through hole, and a penetration part 7 with a size smaller than a diameter of a through hole 8 and a length longer than the through hole is fitted to the through hole 8 of an insulation sheet 5. The contact head part 6 has an electric contact face contacting a contact part of the other circuit, and an area ranging from one end part of the electric contact face to the other end part thereof is electrically connected by a metal film 3. When fitting the contact into the through hole 8, the contact head part at one side is elastically compressed, and made to pass through. By the above, the contact head part is prevented from falling-off, and floating state can be maintained. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 as shown in FIG.

  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 press-fits the contact with the projection and the coupling body into the housing hole of the frame body, and further, on the contact surface with the other party provided with the conductive film of the contact coupling body. A single-sided adhesive tape must be affixed to the upper and lower surfaces in such a way as to avoid this. 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 contact (B).
(B) Insulating sheet having a through-hole through which the contact passes (b) A contact head made of rubber that penetrates the through-hole, wherein both ends of the through-hole have an electrical contact surface with another circuit contact portion The electrical contact surfaces at both ends are electrically connected, the size of the contact head is larger than the size of the through hole, and the diameter of the through portion is smaller than the size of the through hole. A contact that is small and the length of the penetration is larger than the thickness of the insulating sheet

  A second 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.

  According to a third configuration of the present invention, in the first configuration or the second configuration, the through hole is a long hole that can arrange a plurality of contacts in a straight line, and the plurality of contacts are connected in a straight line while maintaining insulation. It is a connector characterized by being a thing.

  According to a fourth configuration of the present invention, a plurality of long holes of the third configuration are provided in parallel with each other, and a plurality of linearly connected contacts of the third configuration pass through the long holes. It is a connector characterized by this.

In the first configuration of the present invention, the 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.
Although the size of the contact head is larger than the size of the through-hole, it is a flexible material, so that one of the contact heads is compressed and pushed into the through-hole or pulled from the opposite side to pull out the through-hole. Since it returns to its original size when it is completely pulled out, the penetrating portion penetrates the through hole, and both ends thereof are larger than the diameter of the through hole. Since the dimension of the through part is smaller than the dimension of the through hole and the length of the through part is larger than the thickness dimension of the insulating sheet, that is, the length of the through hole, the contact is held floating. Become.

  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.

  Since the thing of a 2nd structure replaced with an 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 third configuration has an advantage that a connector having a large number of contacts can be easily realized because the through-hole is a long hole and a plurality of contacts are linearly connected.

  The fourth 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 since the third configuration is provided in a plurality of rows. There is an advantage that can be obtained.

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 illustrating a connection contact in which a plurality of contacts are connected, a situation in which the contact is attached to the through hole of the insulating sheet, and a state in which the contact is attached.
The base material of the contact is rubber. This rubber includes a highly flexible insulating material such as natural rubber, synthetic rubber, gel and the like. As for the shape, (a) 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 (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 portion 8, but there is a contact head 6 that is larger than the size of the through hole 8 at the top and bottom, so that the contact head 6 is removed It has a stopping function and will not come out unless it is forcibly pulled. Accordingly, it is possible to float by the length of the through portion 7 longer than the length of the through hole (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.

  2B and 2C, the PWB 9 is warped, the electrode pads 10 are 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. It is a figure which shows the example by which the through-hole of the long hole was provided in the insulating sheet by one example of this invention connector, and the electrical contact surface was arranged in matrix form by inserting a connection contact in each. 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.

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 (4)

A connector having the following (A) insulating sheet and (B) contacts.
(B) Insulating sheet having a through-hole through which the contact passes (b) A contact head made of rubber that penetrates the through-hole, wherein both ends of the through-hole have an electrical contact surface with another circuit contact portion The electrical contact surfaces at both ends are electrically connected, the size of the contact head is larger than the size of the through hole, and the diameter of the through portion is smaller than the size of the through hole. A contact that is small and the length of the penetration is larger than the thickness of the insulating sheet   A connector having a plate-like insulator instead of the insulating sheet according to claim 1.   3. The connector according to claim 1, wherein the through hole is a long hole in which a plurality of contacts can be arranged in a straight line, and the plurality of contacts are connected in a straight line while maintaining insulation. A connector according to claim 3, wherein the elongated holes of claim 3 are provided in parallel in a plurality of rows, and the contacts of claim 3 penetrate through the elongated holes.

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