JP2967514B2 - Electrical connector for connecting to LSI package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrical connector for connecting to an LSI package, and more particularly to a so-called zero insertion force socket of a zero insertion force (ZIF) type.

[0002]

2. Description of the Related Art As will be described in detail later, an electric connector is used for connecting to an LSI package having an electric circuit board. Such an electrical connector is mounted on and electrically connected to an electric circuit board,
Acts as an LSI package holder on the electric circuit board.

As is well known, an LSI package includes a package substrate and a plurality of package pins protruding from the package substrate. A known electrical connector for an LSI package is to be mounted on an electrical circuit board and is received in a base insulator having a plurality of contact elements formed in a first direction and a contact receiving hole for connecting a package pin. A plurality of socket-type contact elements. Each of the contact receiving holes is an elongated hole having a hole shape enlarged in a second direction perpendicular to the first direction. A contact portion for contacting one of the package pins, and a terminal portion for projecting downward from the base insulator in a first direction to connect to a conductive pattern on the electric circuit board; An intermediate portion that connects and bridges between the terminal portion and the contact portion is provided. The lower part of the intermediate part adjacent to the terminal part is fixed to the base insulator inside the contact receiving hole, so that the contact element is fixed and supported by the base insulator while the contact part is cantilevered at the fixing part. . The contact portion is disposed at a first position near the side wall at the end of the slot in a second direction and includes a pair of wings extending parallel to each other with gaps spaced to form a socket contact portion. The gap is smaller than the diameter of each of the package pins. The other end of the slot, ie, the second end, is for loosely fitting a corresponding one of the package pins. The cover insulator is movably mounted on the base insulator to cover the base insulator, and includes an LSI
This is for supporting the package. The cover insulator has a plurality of through holes for package pins.
The cover insulator is capable of reciprocating on the base insulator between the waiting state and the connected state in the second direction. When the cover insulator is in the waiting state, the through holes are each directly above the second end of the enlarged slot. When the LSI package is mounted and the package pins are received in the through holes, the package pins are also loosely inserted into the second ends of the long holes of the base insulator.

When the base insulator is moved relative to the cover insulator in the second direction toward the connection position, the package pins are respectively connected to the pair of socket contact portions in the contact receiving holes so as to contact the socket contact portions. Sliding into the wing gap.

[0005]

However, in this known electrical connector for LSI package connection, the contact element has a socket contact portion having a pair of wings. Accordingly, the socket contact portion has an excessively large wing area for which metal plating needs to be performed. Because of such a wing structure, many materials for the wing are also required. In addition, electrical connectors must have significant thickness to maintain the wing structure. As a result, electrical connectors are expensive to produce and bulky and undesirable. In addition, it is difficult to increase the number of socket contacts, and as a result, it becomes impossible to arrange high-density multi-core socket contacts. Further, the user may LS push the cover insulator in the second direction to push the package pins into the gap between the wings of the pair of socket contacts to connect to the socket contacts.
To work with the I-package requires considerable driving force.

[0006] Therefore, a technical problem of the present invention is to reduce the connection operation force of a user with a compact L.
An object of the present invention is to provide an electrical connector for an SI package.

Another object of the present invention is to provide an electrical connector for an LSI package which does not require substantial insertion force into the LSI package.

[0008] A further subordinate object of the present invention is:
An object of the present invention is to provide an electrical connector for an LSI package, wherein the number of contact elements having high density is arranged in multiple cores.

[0009]

According to the present invention, there is provided an electrical connector for connecting an LSI package having a plurality of package pins projecting in a predetermined direction. The connector includes a plurality of contact elements to be respectively contacted with the package pins; a base insulator having a plurality of contact receiving holes for generally securing and receiving the contact elements to extend in a first direction; and each of the contact receiving holes. Has an enlarged slot adjacent to the contact element in a second direction perpendicular to the first direction for loosely fitting a corresponding one of the package pins; movable in the second direction. A cover insulator mounted on the base insulator to be received and having a plurality of through holes for receiving the LSI package and loosely fitting the package pin to be penetrated, whereby the package pin The cover insulation with the package mounted There wherein when it is moved in the second direction relative to the base insulator, is moved in the second direction in the contact receiving hole is contacted with the contact. Each of the contact elements has a terminal pin protruding from the base insulator in its first direction; and two resiliently supported package pins defined by an L-shaped slit cut from the side to make two-point contact with the package pin. A contact plate part having a finger part to be provided; and an intermediate plate part bridging between the terminal pin part and the contact plate part, wherein the intermediate plate part is connected to the base insulator at the contact receiving hole. The contact plate portion is fixedly supported, whereby the contact receiving portion supports the contact plate portion in a cantilever manner. The contact receiving hole protrudes inward from an inner wall of the hole, and has a protruding wall portion that engages with the contact plate portion so as to elastically deflect the contact portion into a preloaded state.

[0010] The electrical connector may further include a crank accelerator for moving the base insulator with respect to the cover insulator in a second direction.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to FIGS. 12 to 16, a known electrical connector for connecting an LSI package to an electrical circuit board will be described first to facilitate understanding of the present invention.

Referring to FIGS. 12 and 13, a known connector 21 protrudes from a first one of four side surfaces of a rectangular plate as shown by a dashed line in FIG. 13 (a). A rectangular plate base insulator 22 having ears 23 is provided. The protrusion 24 is formed so as to protrude from the second and third opposite side surfaces adjacent to the first side surface. Multiple contact elements 25
Has a terminal portion housed and arranged in the base insulator 22 and protruding downward from the base insulator 22 in a first direction as indicated by an arrow A. Only the terminal portion is shown in FIGS. 12 and 13 (b).

The cover insulator 26 is movable and mounted on the base insulator 22, and includes a plurality of package pin receiving holes 28 formed and arranged, and first and second cover pins for covering the second and third side surfaces of the base insulator 22. An upper plate 27 having side plates 29 and 29 is provided. The first and second side plates 29 and 29 are formed with a guide groove 30 that receives and engages the protrusion 24, so that the cover insulator 26 moves along the guide groove 30 with respect to the protrusion 24. It is movable in a second direction (arrow B in FIG. 1) perpendicular to the first direction (A).

Cam accelerator, ie, crank accelerator 3
1 couples the base insulator 22 and the cover insulator 26 to move the cover insulator 26 with respect to the base insulator 22 in the second direction. The crank accelerator 31 includes a crank pin 32, a pair of crank arms 33 connected to opposite ends of the crank pin 32, and a pair of crank shafts 34 and 35 connected to the crank arms 33, respectively. The ear portion 23 of the base insulator 22 has a third portion perpendicular to both the first direction (A) and the second direction (B).
13 (arrow C in FIG. 13). In the hole 36, the crankpin 32 is arranged so as to rotate and move in a first direction. The crankshaft 34 is rotatably and movably engaged with a first one of the side plates 29 of the cover insulator 26 by an engagement O-ring 37. Other crankshafts 35 also
The base insulator 22 is fitted and engaged in a groove 38 formed in the cover insulator 26 adjacent to the ear 23 of the base insulator 22. Accordingly, the crankshaft 35 is rotatable in the groove 38 and is movable in the groove 38 in the first direction (A). The lever or handle 39 is connected to the end of the crankshaft 35 so that the crankshaft 31
Can be rotated by turning the handle 39. When the crankshaft 31 is turned, the cover insulator 26 is moved in the second direction (B).

When the handle 39 is in the position shown by the imaginary line in FIG. 12, that is, when it stands on the cover insulator 26 in the first direction (A), the cover insulator 26 is in the first or waiting position, An LSI package (not shown) may be mounted on the cover insulator 26, but has not yet contacted the contact element 25.

FIG. 12 and FIG.
When the cover insulator 26 is turned from the waiting position to the position shown by the solid line in (a), the cover insulator 26 is moved in the second direction (B), and eventually the cover insulator 26 comes into contact with the contact element 25. 2, ie, it is moved to the connection position. In this position, the handle 39 is locked by extending in the second direction (B) and engaging with the locking projection 40 protruding from the cover insulator 26 in the third direction (C).

Referring to FIGS. 14 to 16, package pin receiving holes 2 of base insulator 22, contact element 25, and cover insulator 26 will be described.
8 and the contact element 2
The contact operation between the pin 5 and the package pin 42 will be described.

The LSI package 41 has a plurality of package pins 42 projecting from the bottom surface of the LSI package 41.

The base insulator 22 includes a plurality of contact receiving holes 43 formed in a first direction and a socket-type contact element 2 received in the contact receiving holes 43 for connecting to the package pins 42.
5 is provided. Each of the contact receiving holes 43
It is a long hole having a hole shape projecting in a second direction (B) perpendicular to the first direction (A). Contact element 25
Each of the terminal portions 25a protrudes downward from the base insulator 22 in a first direction (A) for connection to a conductive pattern on an electric circuit board (not shown).
And a contact portion 25b for contacting one of the package pins 42, and a connection between the terminal portion 25a and the contact portion 25b.
A bridging intermediate portion 25c. The lower portion (fixed portion) 25d of the intermediate portion 25c adjacent to the terminal portion 25a is fixed inside the contact receiving hole (elongated hole) 43, and as a result, the contact element 25 has the lower portion (fixed portion) 25d of the contact portion 25b. It is cantilevered and fixedly supported by the base insulator 22. The contact portion 25b
A pair of wings 25b arranged at a first position near the side wall at the end of the elongated hole 43 in the second direction (B) and extending in parallel to each other with a gap separated so as to form a socket contact portion. -1 and 25b-2.
The gap is smaller than the diameter of each of the package pins 42. The other end of the elongated hole 43, that is, the second end is for loosely fitting a corresponding one of the package pins 42 when the cover insulator 26 on which the LSI package 41 is mounted is in a waiting state. That is, when the cover insulator 26 is in the waiting state,
8 are directly above the second ends of the slots 43, respectively. L
The SI package 41 is mounted on the cover insulator 26, so that the package pin 42 is
8 accepted. Then, the package pin 42 is also loosely inserted at the second end of the enlarged elongated hole 43 of the base insulator 22, as shown in FIG.

When the lever 39 is pivoted in the second direction (B), the crank accelerator 31 rotates, and the crankshaft 35 of the cover insulator 26 and the hole 3 are rotated.
8 acts on the crankshaft 35 so as to push the cover insulator 26 in the second direction (B). Therefore, the cover insulator 26 is moved relative to the base insulator 22 in the second direction (B) toward the connection position. As a result, the package pin 42
The pair of wings 25b in the contact receiving hole (elongated hole) 43
Sliding into the gaps 1 and 25b-2, they come into contact with the socket contact portions 25b, respectively, as shown in FIGS.

The known electrical connector for connecting to an LSI package has the problems described above.

Referring now to FIGS. 1-4, an electrical connector 50 according to a preferred embodiment of the present invention will be described. The electrical connector 50 is similar to the known connector 21 shown in FIGS. Therefore, similar parts are shown in FIG.
16 are designated by the same reference numerals in FIG. 16, and the description is omitted for the purpose of simplifying the description.

Referring to FIG. 1, the electrical connector 50 is characterized in that each of the contact elements 51 is made of a metal plate such as phosphor bronze and has a pin type terminal portion 51.
a, a contact portion 51b, and an intermediate portion 51c that bridges between the terminal portion 51a and the contact portion 51b. Terminal part 51a
The lower portion 51d of the intermediate portion 51c adjacent to the portion is a portion fixed to the base insulator 22. The lower part 51d is
It has a predetermined width considerably larger than that of the terminal portion 51c. The intermediate portion 51c is connected to the terminal 51a.
The width gradually increases toward the wider contact portion 51b. The intermediate portion 51c is bent at an angle of about 10 degrees at an upper position adjacent to the fixing portion 51d. Contact part 51b
Is provided with two finger portions 51b-1 and 51b-2 elastically supported by an intermediate portion 51c by being cut in an inverted L-shape from the side as shown by 52. Each of the finger portions 51b-1 and 51b-2 has a tapered end 53 as shown.

Referring to FIGS. 2 to 4, the base insulator 22 has a plurality of contact receiving holes 43 which are elongated holes similar to the connectors shown in FIGS.
Each of the contact receiving holes 43 has a contact fixing hole 43 a as a lower portion of the contact receiving hole 43, and a projecting wall 54 partially projecting inward on one side wall adjacent to the end wall of the contact receiving hole (elongated hole) 43. Is provided. The projection wall 54 has a tapered surface 55 extending downward and gradually lowering toward the contact fixing hole 43a.

The contact element 51 first guides the contact portion 51b to the contact fixing hole 43a,
It is inserted into the contact receiving hole 43. At this time, the upper end of the contact portion 51b first engages with the tapered surface 55 and is elastically deflected. When the insertion operation is further advanced, the upper end slides upward into the projection wall 54, and at this time, the fixing portion 51d
Is completely inserted into the contact receiving hole 43 while being press-fitted and fixed in the contact fixing hole 43a. Therefore, the contact portion 51b is cantilevered by the fixing portion 51d, and is maintained in the preloaded state after all.

There is a gap between the contact portion 51b and the inner wall of the contact receiving hole 43 facing the contact portion 51b. The gap is slightly smaller than the size of the package pin 42.

The contact receiving hole 43 is provided in each of FIGS.
When the cover insulator 26 is in the waiting state as shown in FIG. 7, the width is larger than the contact portion 51b so as to form a space 43b for receiving the package pin 42.

As described with reference to FIGS. 12 and 13, the lever 39 moves the cover insulator 26 in the second direction (B) from the waiting state to the connected state in the second direction (B).
6B, the package pin 42 moves in the second direction (B) and comes into contact with the contact portion 51b as shown in FIGS. More specifically, since the contact portion 51b is elastically deflected by the projection wall 54 and is preloaded, and has the tapered surface 53, the package pin 42 can easily and immediately contact the contact portion 51 by moving the cover insulator 26 with a small force. 51b
And into the gap between the opposing inner wall of the contact receiving hole 43. The package pin 42 has a contact portion 51b.
When inserted into the gap between the inner wall and the inner wall, the package pin 42 further deflects the contact portion 51b and receives almost all of the elastic force of the contact portion 51b. Guaranteed between 51b and package pin 42. Further, the contact portion 51b is formed with an L-shaped slit 52, whereby the finger portion 51 is formed.
b-1 and 51b-2 are formed, and these finger portions are connected to the package pins 42 and the contact portions 51 as shown in FIG.
b to give a two-point contact.

Referring to FIGS. 8 to 11, an electric connector according to another embodiment has a contact element 61 using a contact element provided with a crank portion 61e and a contact receiving hole 43 formed therein. Except that it is similar to the connector of FIGS. Accordingly, only the differences between the connectors of the two embodiments are described below for simplicity.

Referring to FIG. 8, contact element 6
1 is also made of a metal plate such as phosphor bronze, and includes a pin-type terminal portion 61a, a contact portion 61b, and an intermediate portion 61c bridging the terminal portion 61a and the contact portion 61b. A lower portion (fixing portion) 61d of the intermediate portion 61c is a portion to be fixed to the base insulator 22. The intermediate portion 61c further includes a crank portion 61e adjacent to the lower portion (fixed portion) 61d. The lower portion (fixed portion) 61d has a considerably larger predetermined width than the terminal portion 61a. The remaining portion of the intermediate portion 61c gradually decreases from the crank portion 61e toward the contact portion 61b having a larger width than the terminal portion 61a. Crank part 61e and lower part (fixed part) 61d
Has an angle of about 90 degrees. There is an angle α of about 10 degrees between the crank part 61e and the contact part 61b, that is, the remaining part of the intermediate part 61c. The contact portion 61b is cut into the inverted L-shaped slit 62 from the side, so that the two finger portions 61b-1 and 6b elastically supported by the intermediate portion 61c are provided.
1b-2. Finger portions 61b-1 and 61
Each of b-2 has a tapered end 63 as shown.
have. The finger portions 61b-1 and 61b-2 are
Two-point contact is provided in a manner similar to that shown in FIGS.

Referring to FIGS. 9 to 11, each of contact receiving holes 43 formed in base insulator 22 is the same as that shown in FIGS. Therefore, the contact fixing hole 43a is formed at a position different from that shown in FIGS. That is, the contact fixing hole 43a in FIG. 11 is formed on the side opposite to the hole 43 as compared with that in FIG. The rest of the hole structure is similar to that shown in FIGS.

In the illustrated embodiment, FIGS.
Is formed on the inner wall of the contact receiving hole 43, but the projection wall 56 is
The two tapered portions 57a and 57b are slightly different from the projection wall 54 in FIGS. When the contact element 61 is inserted into the contact receiving hole 43, the intermediate portion 61c has tapered surfaces 57a and 57b as in the connector shown in FIGS.
And is preloaded into the contact receiving hole 43 in a completely assembled state.

The connector of this embodiment has an L
The operation of bringing the SI package pin into contact with the contact element 61 is the same as that of the connector of the previous embodiment shown in FIGS.

[0034]

As described above, according to the electrical connector for connecting to the LSI of the present invention, since the pre-loaded cantilevered plate type contact having the L-shaped slit for providing two-point contact is provided. In addition, there is an effect that the connection operation force of the user is reduced in a compact manner, the substantial insertion force into the LSI package is greatly reduced, and the number of contact elements having high density is arranged in multiple cores.

[Brief description of the drawings]

FIG. 1 is a perspective view of a contact element used in a connector according to a preferred embodiment of the present invention.

FIG. 2 is a partial longitudinal sectional view of a main part of a connector according to a preferred embodiment of the present invention.

FIG. 3 is another sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a partial top view of a main part of the connector of FIGS. 2 and 3;

FIG. 5 is a cross-sectional view of the connector of FIGS. 2 to 4 illustrating a state where an LSI package is mounted on a cover insulator and a lever is pulled up.

FIG. 6 is a sectional view similar to FIG. 5 with the lever depressed.

FIG. 7 is a partial cross-sectional view taken along line 7-7 in FIG.

FIG. 8 is a perspective view of a modified contact element.

FIG. 9 is a view similar to FIG. 2 and relates to a connector using the contact element of FIG. 8;

FIG. 10 is similar to FIG. 3 and relates to a connector using the contact element of FIG. 8;

FIG. 11 is a view similar to FIG. 4 and relates to a connector using the contact element of FIG. 8;

FIG. 12 is a side view of a known electrical connector for connecting an LSI package.

13 (a) is a top view of the connector of FIG. 12,
(B) is a side view of the connector of FIG.

FIG. 14 is a cross-sectional view of a part of the connector taken along line 14-14 in FIG. 13 (a) in which an LSI package is mounted and a lever is raised to set a cover insulator in a waiting state;

FIG. 15 is a sectional view similar to FIG. 14 with the lever depressed to set the cover insulator in the connected state.

FIG. 16 is a partial cross-sectional view of the connector taken along line 16-16 in FIG. 14 when the cam lever is pushed down on the base insulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Well-known connector 22 Base insulator 23 Ear part 24 Projection 25 Contact element 25a Terminal part 25b Contact part 25b-1, 25b-2 A pair of wings 25c Intermediate part 25d Fixed part 26 Cover insulator 27 Upper plate 28 Package pin receiving hole 29 First And second side plate 30 guide groove 31 cam accelerator (crank accelerator) 32 crank pin 33 crank arm 34, 35 crank shaft 37 engaging O-ring 38 groove 39 lever (handle) 40 locking projection 41 LSI package 42 package pin 43 contact Receiving hole (enlarged elongated hole) 50 Electrical connector 51 Contact element 51a Terminal part 51b Contact part 51b-1, 51b-2 Finger part 51c Intermediate part 51d Fixed part 52 Reverse L-shaped slit 53 Per end 54 projecting walls 55 taper surface 61 the contact element 61a terminal portions 61b contact portion 61b-1,61b-2 Fuinga portion 61c intermediate portion 61d lower 61e crank portion 63 tapered end

Claims (6)

(57) [Claims] 1. An electrical connector for connecting an LSI package having a plurality of package pins projecting in a predetermined direction, said connector comprising a plurality of contact elements to be respectively contacted with these package pins. A base insulator having a plurality of contact receiving holes for securing and receiving the contact elements in a manner generally extending in a first direction, each of the contact receiving holes for loosely fitting a corresponding one of the package pins. An enlarged slot adjacent to the contact element in a second direction perpendicular to the first direction; receiving the LSI package mounted on the base insulator to be movable in the second direction; A plurality of through holes for loosely fitting the package pins to be through A cover insulator having a through hole, whereby the package pin is connected to the LS
Wherein when the cover insulator mounted with the I package is moved in the second direction with respect to the base insulator, the cover insulator is moved in the second direction in the contact receiving hole and is brought into contact with the contact; Each of the elements has a terminal pin portion protruding from the base insulator in its first direction; and two resiliently supported two-point contacts defined by the L-shaped slit cut from the side. A contact plate portion having a finger portion; and an intermediate plate portion for bridging between the terminal pin portion and the contact plate portion, wherein the intermediate plate portion is fixedly supported on the base insulator by the contact receiving hole. As a result, the contact receiving hole The contact plate portion is cantilevered, and the contact receiving hole projects inward from the inner wall of the hole, and engages with the contact plate portion so as to elastically deflect the contact portion to a preloaded state. A connector having a protruding wall portion. 2. The electrical connector according to claim 1, further comprising a crank accelerator for moving said base insulator relative to said cover insulator in said second direction. 3. The electrical connector according to claim 1, wherein each of said contact elements is bent at a portion of said intermediate portion to increase a contact pressure with said package pin. connector. 4. The electrical connector according to claim 3, wherein
An electrical connector wherein each of said contact elements is bent at said intermediate portion to form a crank portion. 5. The electrical connector according to claim 4, wherein the protrusion wall has a tapered surface in the first direction, so that the contact element is inserted into the contact receiving hole when the contact element is inserted into the contact receiving hole. An electrical connector, wherein elastic contact is provided to the contact plate portion. 6. The electrical connector according to claim 5, wherein said tapered surface is formed in a multi-step shape.