JP3154120B2 - Socket for pin grid array package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a socket for a pin grid array package for connecting a lead pin to a package such as a semiconductor integrated circuit provided in a grid array state.

[0002]

2. Description of the Related Art Conventionally, this type of socket has a plate-shaped base housing provided with a plurality of terminals arranged in a grid pattern so as to be electrically engageable with lead pins of a pin grid array package, and an upper side of the base housing. And a plate-like slide member having a plurality of through-holes arranged in a lattice so as to allow the lead pins to be inserted. In some cases, a cover member is further provided above the slide member. Through holes are also formed in this cover member (see, for example, JP-A-7-142134, Utility Model Registration No. 2536440 ).

[0003] The slide member is used to insert the lead pin into the socket with zero insertion force when connecting the pin grid array package to the socket.
Slide between a position where the lead pin can be inserted with a zero insertion force to the terminal mounting portion in the base housing through the through hole and a position where the lead pin inserted to the terminal mounting portion and the terminal are electrically engaged. The member can be slid in a plane parallel to the plate surface of the base housing. The sliding of the slide member moves the lead pin to a position where it engages with the contact piece of the terminal on the base housing side, or moves to a position where the contact piece of the terminal engages with the lead pin.

[0004] The means for sliding the slide member is provided with a cam shaft along the rear edge of the base housing,
The camshaft is configured to be rotatable by an operation handle provided along the side of the socket, and the slide member is pushed along the base housing via the camshaft. The operating handle for rotating the camshaft rotates between a horizontal state substantially parallel to the base housing and a vertical state substantially perpendicular to the base housing.

[0005]

As described above, the sliding means for the sliding member in the conventional socket for a pin grid array package is designed to be able to rotate between a horizontal state and a vertical state on the side of the socket. It was configured using an operation handle provided. For this reason, the operation handle must be installed outside the socket, which not only hinders miniaturization of the socket, but also widens the space for turning the operation handle on the side of the socket and above the socket. There was a problem that it had to be secured.

The present invention has been made in view of the above problems, and provides a socket for a pin grid array package in which the socket itself and a space required for operating the socket itself can be reduced, and which is easy to assemble. It is an object.

[0007]

SUMMARY OF THE INVENTION The pin grid array package socket of the present invention, which has been made in view of the above-mentioned object, has a structure in which a slide member can be slid by rotation of an eccentric cam member. The eccentric cam member is provided so as to penetrate the base housing and the slide member, and is prevented from falling out by fitting a fixing ring to the rotating shaft.

That is, the present invention provides a plate-shaped base housing provided with a plurality of terminals arranged in a grid pattern, the plurality of terminals being electrically engageable with lead pins of a pin grid array package; A plate-shaped slide member provided with a plurality of through holes in a grid pattern through which lead pins can be inserted, and the lead pins can be inserted with a zero insertion force to the terminal mounting portion in the base housing through the through holes. A slide means for sliding the slide member in a plane parallel to the plate surface of the base housing is provided between a position and a position where the lead pin inserted to the terminal mounting portion and the terminal are electrically engaged. In the socket for a pin grid array package, the base housing is made of a metal frame member.
Insulating resin is overmolded on the metal frame
The lower cam plate, which is a part of the
The eccentric cam member is disposed on one side of the housing and the sliding means is constituted by an eccentric cam member mounted through the plate surfaces of the base housing and the slide member. The axis is
Inserted into the bearing hole formed in the lower cam plate
It is solid was fitted to the rotary shaft from the bottom side of the base over the scan housing
A pin grid array package socket, wherein an eccentric cam member is prevented from coming off by a fixing ring .

In a preferred embodiment, the slide member is a slide cover directly disposed on the upper side of the base housing, and no cover member is provided on the slide member to reduce the height of the socket. .

[0010]

According to the socket for a pin grid array package of the present invention configured as described above, the eccentric cam member for sliding the slide member is accommodated in the base housing and the slide member to constitute the slide means. That is, the member to be mounted is not installed outside the socket. As a result, the size of the socket can be reduced, and
It is not necessary to secure a space for operating the slide means outside the socket. Further, since the eccentric cam member has a structure in which the fixing ring is fitted to the rotation shaft from the bottom surface side of the base housing and is prevented from coming off, assembly is easy.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 4 show the appearance of a pin grid array package socket (hereinafter simply referred to as a "socket") 50 according to an embodiment. The socket 50 is configured such that a slide cover 52, which is substantially rectangular like the base housing 51, is directly overlapped on the upper surface side (upward in FIG. 2) of the substantially rectangular base housing 51. Locking pieces 53 hang down from opposite side edges of the slide cover 52, and the locking pieces 53 extend along the outer side edges of the base housing 51 so that the slide cover 52
Can be slid with respect to the base housing 51 only in the left and right directions in FIG.

As shown in FIG. 5, the base housing 51 is made thin by overmolding a metal frame member 54 with an insulative resin 55 and molding it into the shape shown in the figure. Also, the slide cover 52 is made of
6 is overmolded with an insulating resin 57 so as to have a shape as shown in the figure to reduce the thickness.

The metal plate 56 is provided with openings 58 in a grid pattern.
Reference numerals 9 are provided in a lattice shape so that lead pins of the pin grid array package can be inserted. On the upper surface side of the base housing 51, these through holes 5
9, terminal receiving cavities 60 are formed in a lattice shape, and terminals 61 are mounted in each terminal receiving cavity 60. As will be described in detail below, the terminals 61 are press-fitted and fixed to the terminal receiving cavities 60 from the upper surface side of the base housing 51 so that the surface can be soldered to a mounting board such as a printed circuit board. The tail 62 faces downward from the bottom surface of the base housing 51.

Base housing 51 and slide cover 5
The eccentric cam member 63 shown in FIGS. 7 to 10 is attached so as to penetrate the centrally protruding portion in the shape of the mountain at one side edge, and a sliding means for the slide cover 52 is configured. The eccentric cam member 63 has a lower rotating shaft 64 fitted on a fixing ring 65 provided on the bottom surface side of the base housing 51 and is prevented from coming off.

The fixing ring 65 has the shape of a donut-shaped flat washer as shown in FIG. 6 and is housed in a recess 67 formed on the bottom side of the base housing 51. It does not protrude outside. With the fixing ring 65 set in the recess 67, the eccentric cam member 63 can be easily mounted by penetrating through the slide cover 52 to the base housing 51.

The eccentric cam member 63 has a structure in which a cam 68 is eccentrically provided above a rotating shaft 64 as shown in the figure. An operation groove 69 is provided on the upper surface of the cam 68 so that a rotary tool such as a driver can be engaged. Further, a notch 70 is provided adjacent to the operation groove 69, but FIGS. 1 and 5 show a case where the notch 70 is not provided.

In order to mount such an eccentric cam member 63, a part of the metal frame member 54 of the base housing 51 is formed as a lower cam plate portion 71, and the lower cam plate portion 71 is attached to the rotation shaft 64. A bearing hole 72 is formed. Further, the slide cover 52 has a thickness of the cam 68 of the eccentric cam member 63 on one side of the metal plate 56.
Upper cam plates 73 having substantially the same thickness are provided one on top of the other (see FIG. 5) , and a cam hole 74 for fitting the cam 68 is formed in the upper cam plate 73.

The cam hole 74 and the cam 68 formed in the upper cam plate 73 have substantially the same shape (circle). On the other hand, a bearing hole 72 formed in the lower cam plate portion 71
Are elongated holes formed along a direction orthogonal to the sliding direction of the slide cover 52 on the same plane (FIG. 1).
1). The width of the long hole is substantially equal to the diameter of the rotating shaft 64. Further, the metal plate 56 constituting the slide cover 52
Is provided with a circular insertion hole 75. Thus, the slide cover 52 can slide with respect to the base housing 51 by the rotation of the eccentric cam member 63.

Base housing 51 and slide cover 5
Reference numeral 2 denotes a fitting structure between the rotating shaft 64 of the eccentric cam member 63 mounted as described above and the fixing ring 65, and a hole edge of the window hole 53a of the locking piece 53 provided hanging down on the slide cover 52. A structure in which a lateral ridge 76 protruding from the side surface of the base housing 51 is engaged so that the state of being overlapped with each other can be maintained at all times.

Next, the terminal receiving cavities 60 provided in the base housing 51 in a lattice pattern and the terminals 61 press-fitted and fixed therein will be described in detail. The terminal receiving cavities 60 are provided in a lattice pattern on substantially the entire surface of the central plate surface 77 formed of the insulating resin 55 overmolded on the metal frame member 54 as shown in FIG.
In other words, the periphery of the insulating resin 55 in which a large number of terminal receiving cavities 60 are formed in a lattice shape is reinforced by the metal frame member 54.

FIGS. 12 to 17 show the terminal receiving cavity 60 in an enlarged manner. The terminal receiving cavity 60 is a substantially rectangular cavity in a plane, and is opened on the upper surface of the base housing 51. A through hole 7 having a shape as shown in FIG.
When the terminal 61 is mounted from the upper surface side of the base housing 51, the tail 62 can be disposed on the bottom surface side of the base housing 51 through the passage hole 78.

Each of the terminal receiving cavities 60 is provided so as to be opposed to each other from the inner wall facing the partition wall 79. One side is a contact piece housing section 80, and the other side is an engagement piece housing section 81.
Is divided into The depths of the contact piece accommodating portion 80 and the engaging piece accommodating portion 81 are both equal to and equal to the depth of the terminal receiving cavity 60. Both sides of the inner wall of the contact piece housing section 80 opposite to the engagement piece housing section 81 are formed in an undercut shape as shown in FIGS.

The terminal 61 press-fitted and fixed in the terminal receiving cavity 60 as described above is formed by punching a thin metal plate into a shape as shown in FIGS. 18, 19 and 20 to 24. . The tail 62, the contact piece 84, the engagement piece 85,
A retaining projection 86 is provided.

That is, the contact pieces 84 are continuous from the both side edges of the base plate 83 to the upper side in FIG. Also, from the one edge of the base plate 83 to the upper side in FIG. 18, a substantially U-shaped engaging piece 8 is inserted via a first narrow continuous arm 87.
5 are consecutive. Further, the tail 6 extends from the other end edge of the base plate 83 to the lower side in FIG.
2 is continuous diagonally downward. A retaining projection 86 is formed on both sides of the second narrow continuous arm 88 so as to extend upward from the base plate 83.

The engaging piece accommodating portion 81 corresponds to the thickness (thickness of the thin metal plate) and the width of the engaging piece 85 provided on the terminal 61. 81 so that it can be fixed by press-fitting. The height of the engaging piece 85 is substantially equal to the depth of the engaging piece accommodating portion 81, that is, the depth of the terminal receiving cavity 60, and the engaging piece 85 extends over the entire length in the height direction of the base housing 51. To be engaged.

The contact piece accommodating portion 80 also has a terminal 61.
The contact piece 84 provided opposite to the above can be accommodated. When the engaging piece 85 is press-fitted into the engaging piece housing 81 and fixed, the opposed contact piece 84 is housed in the contact piece housing 80 with the first narrow continuous arm 87 cantilevered. Has become.

The height of the contact piece 84 is substantially the same as the height of the engagement piece 85, and is therefore substantially the same as the depth of the terminal receiving cavity 60 and the contact piece housing 80. A contact bead 89 is provided laterally inside the upper end of each contact piece 84. The end of the contact bead 89 on the engaging piece 85 side is a tapered surface 90, and the interval between the contact beads 89 is open toward the engaging piece 85 (FIG. 20).

As shown in FIG. 23, the tail 62 provided via the second narrow continuous arm 88 has a tip portion bent (bent), and the vicinity of the bent portion is changed as shown in FIG. ,
The soldered portion 91 is formed wider than the other portions. Through hole 7 formed in the bottom of terminal receiving cavity 60
The shape 8 is similar to the shape of the tail 62 projected on a plane. By making the soldering portion 91 wide, a solder fillet when soldering to a mounting board such as a printed circuit board can be enlarged.

The two retaining projections 86 provided on both sides of the second narrow continuous arm 88 correspond to the engaging step portions 82 formed on the inner wall of the contact piece receiving portion 81 of the terminal receiving cavity 60. And is formed diagonally with the upper end facing outward. When the engagement piece 85 is press-fitted into the engagement piece accommodation section 81 and the contact piece 84 is accommodated in the contact piece accommodation section 80, the retaining projection 86 is accommodated in the undercut portion, and It is designed to engage.

The attachment of the terminal 61 to the terminal receiving cavity 60 is as follows.
From the upper surface side of the base housing 51, with the tail 62 down, the engagement piece 85 is accommodated in the engagement piece accommodation section 81, and the contact piece 84 is accommodated in the contact piece accommodation section 80.
This is performed by pressing the engagement piece 85 into the engagement piece housing 81. At the time of press-fitting, the retaining projection 86 enters while sliding on the inner wall of the contact piece housing portion 80, and is elastically deformed inward. The terminal 61 is engaged with the stepped portion 82 so that the terminal 61 is prevented from coming off. FIG. 25 and FIG. 26 show cross sections in this mounted state.

When the terminal 61 is completely press-fitted, the tail 62 projects from the bottom surface of the base housing 51,
The tails 62 of all the terminals 61 are arranged in a grid. In each terminal 61, the outer edge of the engaging piece 85 bites into the inner wall of the engaging piece housing 81, and the front and back surfaces of the outer edge press against the inner wall of the engaging piece housing 81. It is engaged with the base housing 51 over the entire length in the height direction of 85 and is firmly held.

The contact pieces 84 opposed to each other are placed in the contact piece accommodating portion 80 through the first base plate 83.
Are accommodated in a state of being cantilevered by the narrow continuous arm 87. The stress received when the lead pins of the pin grid array package and the contact pieces 84 are engaged is dispersed by the first narrow continuous arm 87 and is not directly transmitted to the engaging pieces 85 and the engaging portion of the base housing 51. It is like that. The second narrow continuous arm 88 also has a stress distribution function, and the stress from the contact piece 84 is applied to the soldered portion 9 of the tail 62.
1 is not directly transmitted.

Next, the socket 5 configured as described above
The manner in which the pin grid array package is connected to 0 will be described. FIGS. 1 and 5 show the slide cover 52 at a position where the lead pins of the pin grid array package can be inserted through the through holes 59 to the terminal mounting portion in the base housing 51 with zero insertion force. At this time, the position of the through hole 59 is set to be on the chain line 92 in FIG. The lead pin is passed through the through hole 59 to the partition wall 7 provided to face the terminal receiving cavity 60 of the base housing 51.
9 and can be inserted with zero insertion force without contacting the terminal 61.

After inserting the lead pin, the eccentric cam member 6
3 is rotated (90 degrees counterclockwise) so that the slide cover 52 is shown by an arrow 93 in FIG. 5 and an arrow 9 in FIG.
4 so that the slide cover 52 matches the base housing 51. As the slide cover 52 moves, the lead pins of the pin grid array package also move in the same direction, and each lead pin moves between the contact pieces 84 of the terminal 61 and engages with the surface of the contact bead 89 to complete the connection. can do. The tapered surface 90 of the contact bead 89 is
At this time, the movement of the lead pin is made smooth, and the connection can be completed without giving a large stress to the contact piece 84.

According to the socket 50 of the embodiment described above, the sliding means of the slide cover 52 which is a slide member is connected to the base housing 51 and the slide cover 5.
Since the eccentric cam member 63 is mounted so as to penetrate through the second plate surface, the sliding means can be prevented from being provided outside the socket 50, and the socket 50 can be reduced in size. Since the sliding operation of the slide cover 52 can be performed by rotating a rotating tool such as a driver to access the eccentric cam member 63, it is not necessary to secure a space for the sliding operation around the socket 50.

The eccentric cam member 63 has a structure in which a fixing ring 65 is fitted to the rotating shaft 64 penetrating the base housing 51 from the bottom side of the base housing 51 to prevent the eccentric cam member 63 from coming off. 63 can be easily mounted on the slide cover 52 and the base housing 51. Therefore, it is effective in improving manufacturing efficiency. Also, since the structure in which the eccentric cam member 63 is prevented from coming off by the fixing ring 65, the structure in which the base housing 51 and the slide cover 52 are overlapped can be reliably maintained, and play can be prevented between both members.

Focusing on the mounting portion of the terminal 61,
1 is a structure that can be press-fitted into the base housing 51 from its upper surface and fixed, so that a series of workability from mounting the terminal 61 to the base housing 51 to assembling the base housing 51 and the slide cover 52 is good. Also in this respect, it is possible to improve the production efficiency. The base housing 51 may be provided so as to pass through an opening such as the passage hole 78 through which the tail 62 can pass, and the opening may be smaller than when the terminal 61 is mounted from the bottom side of the base housing 51. Can be reduced. When mounted from the bottom side, a large opening similar to the planar projection figure of the entire terminal 61 must be formed. Since the required opening is small, it is possible to suppress a decrease in the strength of the base housing 51 and to prevent a warp or a crack from occurring in the overmolded insulating resin 55.

Further, the terminal 61 and the base housing 51
Has a structure in which the engagement piece 85 is engaged with the base housing 51 over the entire length thereof, so that the terminal 61 can be firmly fixed and the posture of the contact piece 84 can be stabilized. Therefore, the smoothness of the operation of engaging the lead pin and the contact piece 84 via the slide of the slide cover 52 can be maintained.

The terminal 61 includes a contact piece 84 and an engagement piece 8
5 are connected via the first narrow continuous arm 87, the stress applied to the contact piece 84 can be dispersed, and the engaging piece 85 and the base housing 51 can be dispersed.
Can be prevented from being damaged. Also,
Since the structure between the contact piece 84 and the tail 62 is also continuous via the second narrow continuous arm 88, the stress can be dispersed here, and the soldering state 91 of the soldering portion 91 of the tail 62 can be achieved. Can be kept intact.
Therefore, the reliability of the connection between the socket 50 and the mounting board can be maintained.

[0041]

As described above, in the socket for the pin grid array package of the present invention, the sliding means includes:
It is composed of an eccentric cam member that is mounted through the base housing and the plate surface of the slide member, and a fixed ring is fitted to the rotating shaft that penetrates the base housing. In addition, the space for operating the slide member can be reduced, and the assembling can be facilitated. Also,
Base housing is covered with insulating resin over metal frame member
-Molded and thinned socket
be able to.

[Brief description of the drawings]

FIG. 1 is a plan view of a socket according to an embodiment of the present invention.

FIG. 2 is a front view of the socket.

FIG. 3 is a right side view of the socket.

FIG. 4 is a bottom view of the socket.

FIG. 5 is a partially enlarged sectional view of the socket.

FIG. 6 is a plan view of a fixing ring fitted to the eccentric cam member.

FIG. 7 is a front view of the eccentric cam member.

FIG. 8 is a left side view of the eccentric cam member.

FIG. 9 is a plan view of the eccentric cam member.

FIG. 10 is a bottom view of the eccentric cam member.

FIG. 11 is a plan view of a base housing.

FIG. 12 is an enlarged plan view of a terminal receiving cavity portion of the base housing.

FIG. 13 is an enlarged bottom view of the terminal receiving cavity of the base housing.

FIG. 14 is a cross-sectional view taken along line 14-14 of FIG.

FIG. 15 is a cross-sectional view taken along line 15-15 of FIG.

FIG. 16 is a cross-sectional view taken along line 16-16 of FIG.

FIG. 17 is a cross-sectional view taken along line 17-17 of FIG.

FIG. 18 is a perspective view of a terminal.

FIG. 19 is a partial perspective view of the terminal viewed from the side opposite to FIG. 18;

FIG. 20 is a plan view of a terminal.

FIG. 21 is a front view of the terminal.

FIG. 22 is a bottom view of the terminal.

FIG. 23 is a sectional view taken along lines 23-23 of FIG. 21;

FIG. 24 is a cross-sectional view taken along line 24-24 of FIG. 20;

FIG. 25 is a partially enlarged cross-sectional view of the base housing with the terminals mounted.

FIG. 26 is a partially enlarged cross-sectional view of the base housing with the terminal mounted thereon, taken along the engagement piece of the terminal.

[Explanation of symbols]

 Reference Signs List 50 socket for pin grid array package 51 base housing 52 slide cover 54 metal frame member 55 insulating resin 59 through hole 61 terminal 63 eccentric cam member 64 rotating shaft 65 fixing ring 67 concave portion 72 bearing hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-49-88092 (JP, A) JP-A-56-86781 (JP, U) JP-A-3-33973 (JP, U) (58) Investigation Field (Int. Cl. ⁷ , DB name) H01R 24/00 H01R 33/76

Claims (4)

(57) [Claims] 1. A plate-shaped base housing 51 provided with a plurality of terminals 61 in a grid pattern, the terminals 61 being electrically engageable with lead pins of a pin grid array package, and disposed on an upper surface side of the base housing 51. A plate-like slide member 52 having a plurality of through holes 59 in a grid pattern through which the lead pins can be inserted, wherein the lead pins have zero insertion force through the through holes 59 to a terminal mounting portion in the base housing 51. The slide member 52 is slid in a plane parallel to the plate surface of the base housing 51 between a position where the terminal 61 can be inserted and a position where the terminal 61 is electrically engaged with the lead pin inserted to the terminal mounting portion. in pin grid array package socket 50 sliding means for are provided, said base housing 5 1 is insulated by the metal frame member 54
Resin 55 is over-molded and the metal frame
Lower cam plate portion 71 composed of a part of material 54
Are disposed on one side of the base housing 51, and the sliding means is mounted on the eccentric cam member 63 mounted through the plate surfaces of the base housing 51 and the sliding member 52.
It is constituted by a rotary shaft 64 of the eccentric cam member 63 extending through the base housing 51, the Rowakamupu
A fixed hole is inserted through a bearing hole 72 formed in the rate portion 71 and fitted to the rotating shaft 64 from the bottom side of the base housing 51.
An eccentric cam member (63) is prevented from coming off by a fixing ring (65) . 2. The metal on the bottom surface of the base housing 51.
Insulating resin 55 overmolded on frame member 54
The socket for a pin grid array package according to claim 1, wherein a recessed portion (67) for accommodating the fixing ring (65) is formed so that the fixing ring (65) does not protrude outside the base housing (51). 3. The slide member 52 has an upper side on one side.
An insulating resin 57 is provided on the metal plate 56 on which the cam plate 73 is stacked.
Is overmolded, and the eccentric cam member
63 is a cam 68 of the upper cam plate 73
3. The socket for a pin grid array package according to claim 1, wherein the socket is accommodated in the hole . 4. The thickness of the upper cam plate 73 is
And substantially it is equal to the thickness of the cams 68 of the eccentric cam member 63,
The cam 68 projects outside from the upper cam plate 73
4. The socket for a pin grid array package according to claim 3, wherein the socket is not provided.