JP2002352928A - Ic socket having cam mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an IC socket having a cam mechanism for preventing tilting of a camshaft. SOLUTION: This socket has a housing member 20 where plural housing holes 23 to house a terminal 10 and a slide member 30 slidable on a plate face of the housing body part, and the slide member 30 becomes slidable between a standby position, where a connector is opposed to a terminal by the zero insertion force or a low insertion force and a connection position to be connected with the terminal using a contact pressure by the cam mechanism installed between a pressure-receiving fitting 32 of the slide member and a rotation support fitting 22 of the housing member; the cam mechanism is constituted of a camshaft 40, a rotation support face 24 formed at the rotation supporting fitting 22 of the housing member and to rotate and coaxially support the camshaft with the rotating shaft line; a pressure-receiving face 35 formed at the pressure receiving fitting 32 of the slide member and engaged with a cam face of the camshaft; and the rotation support face 24 of the housing member and the pressure-receiving face 35 of the slide member are positioned closely near to the slide face, in the direction of the rotating shaft line of the camshaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC having a cam mechanism.
Regarding C socket.

[0002]

2. Description of the Related Art As this type of IC socket, for example, the one disclosed in JP-A-2000-323250 is known. As shown in FIG. 3 of the accompanying drawings, this known IC socket includes a housing member 50 for accommodating a terminal 60, a slide member 70 slidable on the housing 50, and a slide member 70 for driving the slide member 70 to slide. And a camshaft 80.

In the housing member 50, a large number of receiving holes 52 are formed in a plate-shaped main body 51 so as to penetrate in the thickness direction, and a terminal 60 is stored in each receiving hole 52. The housing member 50 has a left end portion 53 formed to be thicker than the main body portion 51, and a metal support plate 54 is provided integrally therewith to provide high strength. The support plate 54 is provided with a cylindrical rotation support surface 54A about the axis 55.

The terminal 60 has a contact portion 61 having a U-shape that opens rightward in a cross section, and a leg-like connecting portion 62 extending downward from the contact portion 61. Contact section 6
1 is wide at the right and narrow at the left.

[0005] The slide member 70 has a plate-shaped main body 71 having a connection hole 72 formed therethrough at a position corresponding to the accommodation hole 52. A metal plate 73 is integrally attached to the left end of the main body 71 to provide high strength, and a ring-shaped cam follower 74 is integrally attached to the metal plate 73. The cam follower 74 has a cylindrical pressure receiving surface 74A centered on the axis 75 at a position eccentric to the axis 55 by the distance δ. The metal plate 73 has a window 73A so as to be movable by a distance 2δ.

The cam shaft 80 has a shaft portion 81 supported by the rotation support surface 54A and rotatable by a predetermined angle around the axis 55, and a cam portion 82 having a cam surface 82A on the outer periphery.

In use, the terminal 91 of the IC 90 is inserted into the terminal 60 in the housing hole 52 of the housing 50 through the connection hole 72 of the slide member 70. The U-shaped contact portion 61 of the terminal 60 has a width wider than the diameter of the terminal 91 at the right portion, and is inserted with zero insertion force.

Next, the camshaft 80 is rotated in the groove 83 of the camshaft 80 using an appropriate tool. The axis 75 of the cam surface 82A of the cam shaft 80 and the axis 55 of the shaft body 81 are separated by a distance δ.
For example, if the rotation angle is 180 °, the rotation of the cam shaft 80 causes the slide member 70 to slide leftward by a distance 2δ. Therefore, the IC terminal 91 in the connection hole 72 of the slide member 70 is also pressed by the inner surface of the connection hole 72 and moves leftward by the same distance 2δ. As a result, the terminal 91 is connected to the contact portion 61 of the terminal 60.
Is press-fitted into the left portion, that is, the narrow portion, where it is connected to the contact portion 61 with a predetermined pressure. Thus, IC 90
The connection portion 62 of the terminal 60 is electrically connected to the circuit board P that makes elastic contact.

[0009]

In such a known device, the cam member 80 is rotated to rotate the slide member 70.
When the camshaft 80 is slid,
Of the cam surface 74A and a force F2 of the rotation support surface 54A that supports the reaction force F1. F1 and F
2 has the same size but the opposite direction. However,
The couple due to the above two forces generates a correspondingly large moment force because the distance H between the rotation support surface 54A and the cam surface 74A is large. As a result, the camshaft 80 has a tendency to incline, so that the camshaft 80 is made of metal in order to come into contact with the pressure receiving bracket and the rotation supporting bracket, which are made of metal to secure strength, The camshaft may be damaged or may be misaligned.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an IC socket having a cam mechanism that does not damage a camshaft or cause a misalignment.

[0011]

According to the present invention, there is provided an IC socket having a cam mechanism, wherein a rotary support bracket is integrally formed on a flat housing body having terminals and a plurality of receiving holes for receiving the terminals. And a slide member integrally provided with a pressure receiving member on a flat plate-shaped slide body portion slidably supported by the housing member on one plate surface of the housing body portion.
The housing hole of the housing main body is opened in the one plate surface, and a connection hole for allowing a corresponding connector for connection with the terminal to be penetrable is formed in the slide main body. The slide member faces the terminal through the connection hole with zero insertion force or low insertion force by a cam mechanism provided between the pressure receiving member of the slide member and the rotation support member of the housing member. It is slidable between a standby position and a connection position that contacts the terminal with a contact pressure. The cam mechanism includes a cam shaft having a rotation axis perpendicular to a slide surface between the slide body and the housing body, and a rotation support bracket of the housing member, which rotatably supports the cam shaft concentrically with the rotation axis. It is composed of a rotation support surface and a pressure receiving surface formed on the pressure receiving member of the slide member and engaging with the cam surface of the cam shaft.

In this IC socket, the present invention is characterized in that the rotation support surface of the housing member and the pressure receiving surface of the slide member are located close to the slide surface in the direction of the rotation axis of the camshaft.

According to the present invention, when the slide member is moved by rotating the camshaft, the camshaft receives a reaction force from the rotation support bracket of the housing and the pressure receiving bracket of the slide member, respectively. It also receives a moment due to two reaction forces (couples). Since the camshaft, the rotation support bracket, and the pressure receiving bracket are all metal, they have sufficient strength against the reaction force itself, and there is no problem. Next, regarding the moment force which has become a problem in the known device, since the distance between the points where the two reaction forces act is extremely small in the present invention, the above-mentioned moment force is also small, and the tendency to incline the cam shaft is allowable. As small as possible. As a result, the camshaft is hardly damaged and the shaft is hardly displaced.

In the present invention, the rotation supporting surface and the pressure receiving surface are close to each other as described above. For example, the rotation supporting surface and the pressure receiving surface are located in the total thickness range of the housing body and the slide body in the rotation axis direction of the cam shaft. Can be. By doing so, the size of the IC socket can be reduced in the thickness direction.

With respect to the cam, the pressure receiving surface may be formed by a cylindrical surface centered on an axis parallel to and eccentric to the rotation axis of the camshaft.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

The IC socket of the embodiment shown in FIG. 1 has a housing member 20 for holding a terminal 10 and a slide member 30 slidable on the housing member 20.
And a camshaft 40 for slidingly driving the slide member.

The housing member 20 includes a plate-shaped main body 21 made of an insulating material, and a main body 2 at the left end of the main body 21.
1 and a rotation support fitting 22 integrally attached thereto by molding or the like. The main body 21 has a terminal 1
A plurality of accommodation holes 23 for accommodating 0 are formed in a row. The arrangement matches the arrangement of the connectors of the integrated circuit (IC) described later. The terminal 10 in the accommodating hole 23 has a transverse section (a section perpendicular to the plane of the paper and extending left and right).
The contact portion 11 has a “U” shape and opens leftward, and a leg-shaped connection portion 12 extending downward from the contact portion 11. The contact portion 11 has a tapered shape on the left side, that is, the open side, and has an inner width larger than that on the back.
A solder ball 13 is attached to the lower end of the connection portion 12 so as to protrude from the accommodation hole 23. This solder ball 1
When the circuit board 3 is placed on the corresponding circuit section of the predetermined circuit board, it is melted only by applying hot air, and the connection section 12 is soldered to the circuit section.

The rotation support member 22 is plate-shaped and is within the thickness range of the main body 21 of the housing member 20. In the example shown in the drawing, the upper surface is at a level corresponding to the upper surface of the main body 21. . This rotation support bracket 22 has a radius R
One hole is formed about the axis Z1, and its inner surface forms a rotation support surface 24 for a cam shaft described later.

The slide member 30 includes a main body 31 made of an insulating material, and a pressure-receiving fitting 32 integrally attached to the main body 31 at the left end of the main body 31 by molding or the like.
And The main body 31 includes the main body 31
A connection hole 33 through which a pin-shaped connector C1 can penetrate when an integrated circuit (IC) is disposed on the upper surface of the substrate is formed. A tapered surface 33A is formed on the upper opening edge of the connection hole 33 to facilitate introduction of the connector C1. The main body 31 has a small upright portion 3 at its end.
4, the wall surface 34A of which is provided with the integrated circuit C
Facilitates positioning. At this position, the arrangement positions of the terminal C1 of the integrated circuit C, the connection hole 33 of the main body 31 of the slide member 30, and the accommodation hole 23 of the main body 21 of the housing member 20 match. . In terms of size, the connection hole 33 is provided with the connector C1 of the integrated circuit C.
It is sufficient that the inner width dimension is slightly larger than the thickness of the connector C1 so that the connector C1 can penetrate. The size is such that the connector C1 is allowed to move in the lateral direction, and an inner width dimension suitable for the contact portion 11 is required, so that the accommodation hole 23 is the largest.

The pressure receiving member 32 of the slide member 30 is in the thickness range of the main body portion 31 of the slide member 30 in the same manner as the plate-shaped rotation support member 22 of the housing member 20. It is at the same level as the lower surface of the main body 31. That is, the lower surface of the pressure receiving bracket 32 and the upper surface of the rotation support bracket 22 are in contact with each other or are close to each other.

The pressure receiving fitting 32 is connected to the housing member 20.
A hole having a radius R2 is formed around an axis Z2 that is eccentric by a distance δ from the axis Z1 of the hole having a radius R1 that forms the rotation support surface 24. This hole forms a pressure receiving surface 35. A distance twice the eccentric distance δ is a sliding distance of the sliding member 30.

The cam shaft 40 includes a shaft portion 41 and a cam portion 42,
Further, a locking portion 43 is provided below the shaft portion 41, and a flange portion 44 is provided above the cam portion 42. Shaft 41
Has a cylindrical outer surface with a radius R1 that matches the rotation support surface 24 of the housing member 10, and is rotatably supported by the rotation support surface 24 about the axis Z1. Next, the cam portion 42
An axis Z2 eccentrically located by a distance δ from the axis Z1
And a cam surface 42A of a cylindrical outer surface having a radius R2 centered at the center. The cam surface 42 </ b> A has a shape and size that substantially coincides with the pressure receiving surface 34 of the slide member 30 over the entire circumference. The lower surface of the flange portion 44 is in contact with the upper surface of the pressure receiving fitting 32 and is locked in the axial direction (vertical direction). On the other hand, the locking portion 43 is thin and can be plastically worked because the concave portion 43A is formed therein. The locking portion 43 is locked to the lower surface of the rotation support bracket 22 of the housing member 10 via a locking ring 45 after undergoing plastic working to increase the diameter. Thus, the camshaft 40 can be rotated by the flange portion 44 and the locking portion 43 while being positioned in the axial direction.

The IC socket of this embodiment is used in the following manner. First, in the state shown in FIG. 1, the IC socket is brought to a predetermined position on the circuit board, and hot air is applied to the solder balls 13 to melt the solder balls 13 to connect the connection portions 12 of the terminals 10 to the corresponding circuit portions of the circuit board by soldering. Next, the integrated circuit C is disposed on the slide member 30. In the state of FIG. 1, the pin-shaped connector C1 of the integrated circuit C passes through the connection hole 33 of the slide member 30,
It reaches the terminal 10 in the housing hole 23 of the housing member 20.
This position is a standby position for the connector C1. The connector C1 of the integrated circuit C is inserted into the wide left portion of the terminal 10 contact portion 11 on the housing member side. The left portion of the contact portion 11 is tapered and wide toward the open side as described above, and the connector C1 is inserted with zero insertion force or low insertion force. Next, the camshaft 40 is rotated by an appropriate tool.
For example, the camshaft 40 is rotated by 180 ° around the axis.
In the state shown in FIG. 1, the axis Z2 of the cam surface 42A is eccentric to the left from the rotation axis Z1 by a distance δ, but this rotation causes the eccentricity to move eccentric to the right from the axis Z1. Therefore, the slide member 30 having the pressure receiving fitting 32 pressed on the pressure receiving surface 35 by the cam surface 42A slides on the housing member 20 to the right by a distance 2δ. Due to the movement of the slide member 30, the connector C1 of the integrated circuit C is also moved by being pressed by the inner surface of the connection hole 33.
The contact portion 11 is pushed into the right portion of the contact portion 11 and comes into contact with the contact portion 11 at a predetermined pressure. That is, the connector C1 has moved to the connection position. Thus,
The connector C1 of the integrated circuit C is connected to the circuit board via the terminal 10.

The cam shaft is reciprocated in the forward and reverse directions. Each time, the cam surface 42A and the outer surface of the shaft portion 41 receive equal but opposite reaction forces F1 and F2 on the pressure receiving member 32 and the rotation supporting member 22. Receive from However, in the present embodiment, the distance H between the lines of action of the reaction forces F1 and F2 is small because the pressure receiving fitting 32 and the rotation support fitting 22 are close to each other. Therefore, the camshaft 40 generated by these reaction forces F1 and F2.
The moment force to incline is small. As a result, the camshaft 40 is hardly damaged, and there is almost no problem such as misalignment.

Next, another embodiment will be described with reference to FIG. In FIG. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the present embodiment, the rotation support fitting 22 of the housing member 20 is provided with a shaft portion 25 centered on the axis Z1 at the top.
The camshaft 40 is fitted to the shaft portion 25 by a hole 45 formed in the cam portion 42. That is, the peripheral surface of the shaft portion 25 forms the rotation support surface 24. This cam part 4
Numeral 2 is substantially at the same position as the shaft portion 25 in the axial direction (vertical direction), and a cam surface 42A is formed on the outer surface by a cylindrical surface centered on the axis Z2 eccentric by the distance δ from the axis Z1. The cam surface 42 </ b> A corresponds to the pressure receiving surface 35 of the pressure receiving bracket 32.
Engage with.

In this embodiment, since the hole 45, which is rotatably supported by the shaft 25, and the cam surface 42A are located at substantially the same position in the axial direction, when the slide member is slid by the rotation of the cam shaft, The hole 45 and the cam surface 42
The distance between the lines of action of the reaction force acting on A becomes almost zero,
There is no moment force acting on the camshaft to tilt it.

Therefore, according to the present invention, the moment force for inclining the camshaft does not act or is extremely small as in both embodiments. Therefore, the camshaft and the rotation support bracket are not considered without considering the problem due to this moment force. Then, it is sufficient that the pressure receiving member simply withstands the surface pressure due to the reaction forces F1 and F2, and this can sufficiently cope with this since the material is metal.

[0030]

As described above, according to the present invention, the rotation supporting surface of the housing member and the pressure receiving surface of the slide member are brought closer to each other in the axial direction of the cam shaft. The moment force acting on the camshaft becomes extremely small. As a result, a situation in which the camshaft is damaged or misaligned due to the inclination of the camshaft is avoided, and a smooth sliding operation of the slide member can be obtained. The rotating support fitting forming the rotation supporting surface, the pressure receiving fitting forming the pressure receiving surface, and the camshaft are made of metal, and usually withstand the reaction force itself. Therefore, according to the present invention, it is no longer necessary to consider the influence of the moment force. Furthermore, in the present invention, as a result of the pressure receiving surface and the rotation support surface being close to each other,
The dimension in the axial direction can be reduced, and the size of the device in this direction can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a device according to another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Terminal 20 Housing member 21 Main body part 22 Rotation support fitting 23 Housing hole 24 Rotation support surface 30 Slide member 31 Main body part 32 Pressure receiving fitting 33 Connection hole 35 Pressure receiving face 40 Camshaft C1 connector

Claims (3)

[Claims] A housing member integrally provided with a terminal, a rotation supporting fitting in a flat housing body portion having a plurality of accommodation holes for accommodating the terminals, and a housing member on one plate surface of the housing body portion. A slide member integrally provided with a pressure-receiving member in a flat plate-shaped slide body portion slidably supported by the housing member, and a housing hole of the housing body portion is opened in the one plate surface. A connection hole is formed in the slide body so as to allow a corresponding connector for connection with the terminal to pass therethrough, and the slide member is provided between the pressure receiving metal of the slide member and the rotation support metal of the housing member. The connector is slidable between the standby position where the connector penetrates the connection hole with zero insertion force or low insertion force and faces the terminal, and the connection position where the terminal contacts the terminal with contact pressure by the cam mechanism provided at The cam mechanism includes a cam shaft having a rotation axis perpendicular to a slide surface between the slide body and the housing body, and a cam formed on a rotation support bracket of the housing member and concentric with the rotation axis. An IC comprising a rotation support surface for rotatably supporting a shaft and a pressure receiving surface formed on a pressure receiving member of a slide member and engaged with a cam surface of a cam shaft.
In the socket, an IC socket characterized in that a rotation support surface of a housing member and a pressure receiving surface of a slide member are located close to a slide surface in a rotation axis direction of a cam shaft. 2. The rotation supporting surface and the pressure receiving surface are located in the total thickness range of the housing main body and the slide main body in the direction of the rotation axis of the camshaft. IC socket. 3. The pressure receiving surface according to claim 1, wherein the pressure receiving surface is formed of a cylindrical surface that is parallel to the rotation axis of the cam shaft and is eccentric to the rotation axis. The described IC socket.