JP2003297509A - Contact sheet and socket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact sheet and a socket used for a high-frequency test or mounting, with excellent durability and reliability against a repetitive use, which can respond to a narrow zero insertion force structure. <P>SOLUTION: The contact 5 is structured from a base part 7 fitted in extension from a fixed part 6, and two sheets of beams 8, 9 formed so as to have a narrower gap toward a vertical direction and to a direction of the fixed part 6 from both side ends in an opposite side of the fixed part 6 of the base part 7. After a pin terminal 11 of one electronic device 10 is inserted into a wider side of the tap of the two sheets of the beams 8, 9, an electric connection of the contact 5 and the one electronic device is secured by pinching the pin terminal 11 through sliding of it toward a narrowing side of the gap of the two beams 8, 9, and a terminal 13 of the other electronic device 12 and the contact 5 are made connected, whereby, the electronic devices 10, 12 are mutually connected electrically through the contact 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a contact sheet and a socket. More specifically, it is possible to ensure reliable electrical connection between electronic devices having narrow-pitch and multi-pin pin terminals, and to achieve zero insertion force (ZIF: Zero Insert).
The present invention relates to a contact sheet and a socket suitable for a mounting socket having a high frequency characteristic by using a short contact which has a high reliability and can correspond to an ion force structure.

[0002]

2. Description of the Related Art In recent years, in the field of information processing equipment, with the increasing demand for miniaturization and high speed, electronic devices having pin terminals have become narrower in pitch and have more pins. Further, from the viewpoint of such a narrow pitch, the present situation is that the peripheral array system is being shifted to the lattice array system.

As described above, a socket provided with a contact is used for electrical connection between electronic devices having a narrow pitch and a large number of pins. In particular, this electronic device is a microprocessor (MP
In the case of mounting that is desired to be replaced such as upgrade, such as used as U: microprocessor unit), a pin grid array (PGA: P) capable of detachably connecting this electronic device.
In Grid Array) sockets are often used. In such a socket, it is necessary that all of its contacts surely come into contact with the terminals of each electronic device, respectively, so as to electrically and surely connect them.

This PGA socket has a large number of input / output pin terminals arranged side by side in a grid pattern, and is widely used in electronic devices such as computers as a semiconductor package capable of accommodating multiple pins. Further, this PGA socket is provided with contacts so that each electronic device can be electrically connected in a detachable state.

On the other hand, in recent years, as the speed of MPUs and memories has increased, it has been required to reduce the inductance with respect to higher speed clocks.
The contacts as sockets interposed between the electronic devices are required to have a current passing distance as short as possible and a conductor resistance as small as possible.

Such a PGA socket is, for example,
An electrically insulating and elastic base sheet having a plurality of opening cutouts formed therein, and a conductive and springy contact arranged in the opening cutouts, each contact being an electronic device described above. Is formed in a shape having a groove smaller than the width of the pin terminal. When using it, insert the pin terminal of the electronic device into the contact from above the socket and slide it to widen the groove of the contact to secure the electrical connection between the electronic device and the socket. ing.

[0007]

However, since the conventional PGA socket is thick and the contacts are long in the vertical direction, it is difficult to cope with high-speed signals.

Conventionally, the contacts used in the socket are sequentially punched out by a die or the like, press-fitted into a separately injection-molded housing (base sheet) having electric insulation one pin or one row, and then separated. It was fixed.

At present, a socket having a width of each terminal array of 1.27 mm pitch is being manufactured by such a manufacturing method, but in the future, the pitch of electronic devices will be narrowed and the number of pins will be further increased. It is expected that if a socket with a further narrower pitch is manufactured by using the current manufacturing method, the housing and the contact will be deformed during manufacturing because the thickness of the housing and the contact must be reduced. However, there is a problem in that the resin is not sufficiently spread at the time of injection molding of the housing and the housing having a normal shape cannot be formed.

Further, since the contacts are press-fitted into the housing by one pin or one row, the number of steps increases as the number of pins of the electronic device increases, and the assembly cost increases.

The present invention has been made in view of the above problems, and enables reliable electrical connection between electronic devices having pin terminals with a narrow pitch and a large number of pins, as well as zero insertion. -An object of the present invention is to provide a contact sheet and a socket which can cope with a force structure and have excellent reliability and which can be suitably used as a mounting socket having good high frequency characteristics by using a short contact.

[0012]

In order to achieve the above-mentioned object, the present invention provides the following contact sheet and socket.

[1] Equipped with two electrically insulating and elastic base material sheets having a plurality of opening cutouts, and conductive and springy contacts arranged in the opening cutouts. A contact sheet used for a socket for electrically connecting an electronic device having pin terminals arranged in a lattice and another electronic device to each other,
The contact is a fixed portion fixed in a state where one tip portion is sandwiched between the two base material sheets at one edge portion of the opening cutout portion, a base portion extended from the fixed portion, From the opposite ends of the base portion opposite to both ends in the vertical direction and the two beams formed so as to narrow the mutual distance toward the direction of the fixing portion,
After inserting the pin terminal of one of the electronic devices into the side where the distance between the two beams is wide, slide the pin terminal to the side where the distance between the beams becomes narrower so that the pin terminal is narrowed by the two beams. By holding the contact, the electrical connection between the electronic device and one of the electronic devices is ensured, and the terminal of the other electronic device is brought into contact with the contact, so that the electronic device is mutually connected through the contact. A contact sheet characterized by electrically connecting between them.

[2] The contact sheet according to [1], wherein the width of the base portion is narrowed from the end portion on the fixed portion side toward the end portion on the opposite side.

[3] The above-mentioned [1], wherein the width of the beam is narrowed toward the tip on the fixed portion side.
Alternatively, the contact sheet according to [2].

[4] The contact sheet according to any one of [1] to [3], wherein a solder ball is mounted on the lower surface side of the base portion.

[5] The contact sheet according to the above [4], wherein a pad having a recess corresponding to the surface shape of the solder ball is provided between the base portion and the solder ball.

[6] The contact sheet according to any one of the above [1] to [3], wherein the base portion is formed with a convex portion that protrudes below the two base material sheets.

[7] The contact sheet according to any one of [1] to [6], wherein the contact is made of beryllium copper or nickel beryllium.

[8] A socket for electrically connecting electronic devices having pin terminals arranged in a grid pattern, which comprises the contact sheet according to any one of [1] to [7], A socket having a frame body on which a contact sheet is installed, and an operating part that allows the contact sheet to slide.

[9] The socket according to [8], wherein three or more fixing holes are formed in the frame body.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the contact sheet and socket of the present invention will be specifically described below with reference to the drawings.

FIGS. 1 and 2 are explanatory views showing an embodiment of the contact sheet of the present invention, FIG. 1 is a perspective view, and FIG. 2 is a sectional view. As shown in FIGS. 1 and 2,
The contact sheet 1 of the present embodiment includes two base sheets 2 and 3 having electric insulation and elasticity, in which a plurality of opening cutouts 4 are formed, and a conductive sheet disposed in the opening cutouts 4. A contact sheet (1) used for a socket for electrically connecting between an electronic device (10) having pin terminals (11) arranged in a grid pattern and another electronic device (12), comprising a contact (5) having a spring property, Contact 5
However, a fixed portion 6 fixed in a state where one end portion is sandwiched between two base material sheets 2 and 3 at one edge portion of the opening notch 4, and a base portion 7 extended from the fixed portion 6. , From the both ends of the base 7 opposite to the fixed part 6 in the vertical direction and the fixed part 6
The two terminals 8 and 9 are formed so that the distance between them becomes narrower in the direction of the arrow. The pin terminal 11 of the electronic device 10 on one side has a wider distance between the two beams 8 and 9. After the insertion, the sliding contact is made to the side where the distance between the beams 8 and 9 becomes narrower, and the pin terminal 11 is held between the two beams 8 and 9 to electrically connect the contact 5 and the electronic device 10 on one side. The electronic device 1 through the contact 5 by ensuring the proper connection and bringing the terminal 13 of the other electronic device 12 into contact with the contact 5.
It is characterized in that 0 and 12 are electrically connected to each other.

With such a configuration, the electronic device 10 having the pin terminals 11 having a narrow pitch and a large number of pins can be surely electrically connected, and a zero insertion force structure can be supported. it can. Further, it has excellent durability and reliability against repeated use, and can be suitably used for high frequency tests and mounting. Further, it is possible to shorten the current passing distance in the contact 5, and it is possible to reduce the inductance for a high speed clock.

In the contact sheet of the present invention,
It is preferable that the width of the base portion 7 is configured to be narrowed from the end portion on the fixed portion 6 side toward the end portion on the opposite side. With such a configuration, the stress of the contact 5 can be reduced, so that the electronic device 10 can be easily downsized.

Further, it is preferable that the widths of the beams 8 and 9 are configured to be narrowed toward the tip on the fixed portion side. Since the pin terminal 11 of the electronic device 10 is held between the two beams 8 and 9 to secure the electrical connection with the contact 5, the stress is reduced by configuring in this way. The contact surface pressure at the substantial connecting portion between the pin terminal 11 and the beams 8 and 9 increases, and
The structure is suitable for the F structure.

The contact 5 used in the present invention is not particularly limited as long as it has strength, conductivity, wear resistance, flexibility, oxidation resistance and the like, but for example, beryllium copper, nickel beryllium, etc. As a preferable example, a conductive material having a spring property can be cited. By using these materials for the contact 5, the contact sheet 1 of the present invention can be provided with fatigue characteristics and heat resistance against high temperature. Similarly, heat resistance to high temperatures can be imparted by using, for example, polyimide as the base material sheets 2 and 3.

The contact sheet 1 of the present embodiment is
The base portion 7 has a configuration in which a convex portion 15 is formed so as to protrude below the two base material sheets 2 and 3. In this case, it is preferable that the convex portion 15 is in contact with the terminal 13 of the electronic device 12 in advance when the contact 5 is connected to the other electronic device 12. Since such a contact sheet can be detachably connected to the other electronic device 12, it can be effectively used for a high frequency test of the electronic devices 10 and 12. Further, as shown in FIG. 3, the auxiliary beam 16 is attached to the contact 5, so that the spring load required for connecting the convex portion 15 of the contact 5 and the terminal 13 of the other electronic device 12 can be easily applied. Therefore, the connection between the contact 5 and the electronic device 12, which is removable and highly reliable, can be realized.

Further, as shown in FIG. 4, the contact sheet 1 of the present invention has a solder ball 14 on the lower surface side of the base portion 7.
May be implemented. With this configuration, the electronic device 12 (see FIG. 2) can be surface-mounted via the solder balls 14. At this time, the solder ball 1 is placed between the base 7 and the solder ball 14.
By arranging the pad 19 having the concave portion corresponding to the surface shape of No. 4, the mounting of the solder ball 14 on the base portion 7 becomes stable.

Hereinafter, two specific examples (first method and second method) of the method for producing a contact sheet of the present invention will be described.

First Method First, a sheet having electrical conductivity and elasticity is adhered to a sheet having electrical insulation and elasticity in which a plurality of opening notches are formed. Next, by etching or the like, of the conductive and springy sheet, only the portion where the contact is formed is left. Next, the portion where the contact is formed is cut and bent by a press or the like. Further, as shown in FIGS. 5A and 5B, a portion 17 for forming a contact
A fixed part 26 sandwiched between the base material sheets 22 and 23, a base part 27 extending from the fixed part 26, and two base parts extending from both side ends of the base part 27 opposite to the fixed part 26. A plurality of contact portions 25 composed of beams 28 and 29,
The contact part 25 is formed of at least one connecting part 18 that connects to each other, and the shape of the connecting part 18 is such that when the part 17 forming the contact is bent.
The connecting portion 18 is formed in such a shape that the connecting portion 18 is cut by the breaking stress generated in 8 and the connection portion 18 of the connecting portion 18 before cutting is formed by cutting the connecting portion 18 facing each other. You may arrange | position so that a surface may become a position electrically insulated mutually. If necessary, the contacts may be plated before or after pressing. Finally, on the side where the contacts are exposed, another sheet having electrical insulation and elasticity, in which a plurality of opening notches is formed, is arranged.

Second Method First, only a portion where a contact is to be formed is taken out from a sheet having conductivity and spring property by etching, pressing, or the like. Next, these parts are sandwiched and adhered between sheets having electrical insulation and elasticity in which two opening notches are formed, and cut and bent by a press or the like. Note that cutting by a press or the like, bending may be performed in a state in which a portion where a contact is formed is bonded to one sheet of an electrically insulating and elastic sheet in which a plurality of opening cutouts is formed, The contacts may be plated before or after pressing.

With such a configuration, the contact 5 (see FIG. 1) is formed by molding by a press or the like, so that there is no need to press-fit the contact as in the conventional manufacturing method, and a fine contact can be obtained. Can be easily formed. For example, it can correspond to an electronic device having 500 to 2000 pins, and can correspond to pin terminals having a pitch interval of 1.00 to 0.8 mm. In addition, in such a contact sheet manufacturing method, since there is no limitation in the thickness direction of the contact sheet to be manufactured, the contact sheet 1 (see FIG. 1) having an extremely thin thickness can be manufactured. Further, each contact 5 (see FIG. 1) of the contact sheet 1 (see FIG. 1) is formed by molding a portion 17 for forming a contact, which is formed of one conductive sheet, and thus is formed into an electronic device. The raw material cost does not increase even if the pin terminals of Narrow Pitch and the number of pins are advanced, and conversely, as the pin pitch and the number of pins of Pin terminals are increased, the manufacturing cost per pin is substantially reduced. Can be planned.

Next, an embodiment of the socket of the present invention will be described with reference to FIG. As shown in FIG. 6, the socket 30 of the present embodiment includes an electronic device 10 having pin terminals 11 arranged in a grid pattern, and an electronic device 12.
A contact part 1 of the present invention, a frame body 31 on which the contact sheet 1 is installed, and a movable part for sliding pin terminals of the electronic device 10 with respect to the contact sheet 1. 32 and a lever 33 for moving the movable part.

With this configuration, the electrical connection between the electronic devices 10 and 12 is established by the lever 3
It can be performed only by operating 3.

Further, in the socket 30 of the present embodiment, three or more fixing holes are formed in the frame body 31,
Since the socket 30 can be fixed to the other electronic device 12, the terminal 13 of the electronic device 12 and the contact 5 (see FIG. 1) are connected by the spring load of the contact 5 (see FIG. 1). There is.

[0037]

EXAMPLES Hereinafter, the socket of the present invention will be described more specifically by way of examples, but the present invention is not limited to these examples.

In the present embodiment, as shown in FIG.
A socket 1 was formed in which contact sheets 1 corresponding to 961 pins were arranged in a grid of rows × 31 rows.

In this contact sheet 1, polyimide having a thickness of 25 to 50 μm is used as the material of the base material sheets 2 and 3, and beryllium copper having a thickness of 30 to 70 μm is used as the material of the conductive sheet forming the contact 5. Using.

Square holes (opening notches) having a side of 0.8 mm are formed at a pitch of 1.0 mm on the base sheets 2 and 3 described above, and the conductive sheet is etched to form a base sheet. From a fixed portion 6 sandwiched between two and three, a base portion 7 extending from the fixed portion 6, and two beams 8 and 9 extended from both ends of the base portion 7 opposite to the fixed portion 6. As shown in FIG. 5A, a portion 17 forming a contact is formed, which includes a plurality of contact portions 25 and at least one connecting portion 18 that connects the contact portions 25 to each other. The portion 17 where the contact is to be formed was plated with Ni and Au.

The portion 17 for forming the contact thus formed is sandwiched between the base material sheets 2 and 3 and adhered to each other.
The contact sheet 1 was formed by bending into the shape of the contact 5 as shown in FIG. The connecting portion 18 as shown in FIG.
When bending 7 was performed, the connecting portion 18 was cut due to a breaking stress generated in the connecting portion 18. Then, the contact sheet 1 was turned upside down, the solder balls 14 were arranged on each base portion 7, and the solder balls 14 were mounted on the contact sheet 1 by subjecting the contact sheet 1 to a reflow process.

The contact sheet 1 thus formed is placed in a frame body 31 having a movable portion 32 that makes it slidable with respect to the contact sheet 1 as shown in FIG. did.

The socket 30 of the present embodiment is capable of reliable electrical connection between electronic devices having pin terminals with a narrow pitch and multiple pins, and is compatible with a zero insertion force structure. It was possible and was excellent in durability and reliability against repeated use.

[0044]

As described above, according to the present invention, reliable electrical connection between electronic devices having pin terminals with a narrow pitch and a large number of pins is possible, and a zero insertion force structure is achieved. It is possible to provide a contact sheet and a socket which can be dealt with and which has excellent reliability and is suitable for a mounting socket having good high frequency characteristics by using a short contact.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a contact sheet of the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of the contact sheet of the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the contact sheet of the present invention.

FIG. 4 is a perspective view showing another embodiment of the contact sheet of the present invention.

FIG. 5 is a perspective view showing a portion forming a contact used in manufacturing the contact sheet of the present invention (a).
FIG. 3B is a perspective view showing the base sheet.

FIG. 6 is a perspective view showing an embodiment of a socket of the present invention.

[Explanation of Codes] 1 ... Contact sheet, 2, 3 ... Base sheet, 4 ... Opening notch, 5 ... Contact, 6 ... Fixing part, 7 ... Base part, 8,
9 ... Beam, 10 ... Electronic device, 11 ... Pin terminal, 1
2 ... Electronic device, 13 ... Terminal, 14 ... Solder ball, 1
5 ... Convex part, 16 ... Auxiliary beam, 17 ... Contact forming part, 18 ... Connecting part, 19 ... Pad, 22, 23 ...
Base material sheet, 24 ... Opening notch portion, 25 ... Contact portion,
26 ... Fixed part, 27 ... Base part, 28, 29 ... Beam, 30
... socket, 31 ... frame, 32 ... movable part, 33 ... lever.

Claims (9)

[Claims] 1. An electric insulating and elastic base material sheet having a plurality of opening notches, and a conductive and spring-like contact disposed in the opening notches, A contact sheet for use in a socket for electrically connecting an electronic device having pin terminals arranged in a grid pattern to another electronic device, wherein the contact has one end of the opening notch A fixing portion fixed in a state of being sandwiched between the two base sheets at one edge portion, a base portion extending from the fixing portion, and vertical from both side ends of the base portion opposite to the fixing portion. Direction, and the two beams formed so that the distance between them becomes narrower toward the direction of the fixing portion, and the pin terminal of one of the electronic devices has a wide distance between the two beams. Insert on the side After that, the beam is slid to the side where the distance between the beams becomes narrower, and the pin terminal is sandwiched by the two beams to secure electrical connection between the contact and one of the electronic devices. At the same time, the contact sheet is characterized in that the terminal of the other electronic device is brought into contact with the contact to electrically connect the electronic devices to each other through the contact. 2. The contact sheet according to claim 1, wherein the width of the base portion is configured to become narrower from the end portion on the fixed portion side toward the end portion on the opposite side. 3. The contact sheet according to claim 1, wherein a width of the beam is narrowed toward a tip on the fixed portion side. 4. The contact sheet according to claim 1, wherein a solder ball is mounted on the lower surface side of the base portion. 5. The contact sheet according to claim 4, wherein a pad having a recess corresponding to the surface shape of the solder ball is provided between the base portion and the solder ball. 6. The base part is formed with a convex part projecting downward from the two base material sheets.
The contact sheet according to any one of 1. 7. The contact sheet according to claim 1, wherein the contact is made of beryllium copper or nickel beryllium. 8. A socket for electrically connecting electronic devices having pin terminals arranged in a grid pattern, wherein the contact sheet according to claim 1 and the contact sheet are installed. And a movable part that allows the contact sheet to slide. 9. The socket according to claim 8, wherein three or more fixing holes are formed in the frame body.