CN2253060Y - Zero Insertion Force Electrical Connectors - Google Patents

Abstract

A zero-force electric connector is composed of a base body with several through holes on its top surface, a cover plate on said top surface and with several through holes, a push lever made of polymer material and consisting of an operating handle, a rotary axle vertically arranged at one end of said operating handle, a base body and said cover plate for driving said cover plate to move, and several terminals in said through holes of base body and pushed by said cover plate to make the pins of chip carrier inserted in zero-force mode.

Description

Zero Insertion Force Electrical Connectors

The utility model relates to a zero insertion force electric connector, which has good mechanical and electrical contact performance.

Existing zero-insertion force electrical connectors, as announced in Taiwan Patent No. 83208394, this pin grid array PGA (Pin Grid Array) chip carrier connector has been developed for quite a long time, but whether it is a two-piece PGA connection connector (for example: a cover plate with a base body) or a three-piece PGA connector (for example: a cover plate, a slide plate with a base body), in terms of mechanical performance, manufacturing process or economic cost Each has its disadvantages (please refer to the above-mentioned application description).

The above application provides a PGA connector with zero insertion force, which includes a base body, several terminals, a push lever, a sliding plate and a cover plate, wherein the sliding plate only bears the thrust in the horizontal direction without considering the distance between the base body and the base body. The matching problem; the cover plate only provides a holding function to help the sliding plate slide horizontally on the base body stably without pushing several terminals. The structure of the PGA connector not only conforms to the convenience and economy of manufacture and assembly, but also has good contact with the PGA chip carrier.

However, it has been discovered recently that the PGA connector of the above-mentioned application still has some shortcomings no matter in manufacture or use. Because its push lever is a die-cast metal product, not only the production efficiency is poor, the unit price is high, but also the mold life is short, and the product quality is not easy. control. After being assembled into a finished product, it is not light in weight, which does not conform to the trend of light, thin, short, and small in industrial development. During operation, the metal push lever will rub against the surrounding plastic parts and generate fine chips, and some fine particles will seep into the contact area of the terminal , affecting the functionality of the entire PGA connector.

The purpose of the utility model is to provide a zero insertion force electrical connector, which can overcome the shortcomings of the prior art.

The purpose of this utility model is achieved by providing a zero-insertion force electrical connector, which includes: a base body with a top surface and several holes vertically passing through it; a cover plate with a slidable It is arranged on the top surface of the base body, and has several holes vertically penetrating therethrough corresponding to several channels of the base body; several terminals are correspondingly arranged in the channels of the base body, and the pins of the chip carrier pass through the cover The plate pushes into the hole with zero insertion force; a push lever of polymer material includes an operating handle and a rotating shaft, the rotating shaft is vertically arranged at one end of the operating handle, and placed between the base body and the cover plate between.

The advantages of the zero insertion force electrical connector of the utility model are that it realizes good mechanical contact and electrical contact, overcomes bad friction between parts, and is light in weight and low in cost, and is suitable for mass production.

Below in conjunction with accompanying drawing, describe embodiment of the present utility model, wherein:

Fig. 1 is a three-dimensional exploded view of a PGA connector with zero insertion force of the present invention;

Fig. 2 is a perspective view of the connector base body in Fig. 1;

Fig. 3 is a partial perspective view of the connector cover in Fig. 1, showing its internal claw structure;

Fig. 4 is a perspective view of the sliding plate of the connector in Fig. 1;

Fig. 5 is a perspective view of the push lever of the connector in Fig. 1;

6A is a perspective view of the connector terminal in FIG. 1;

6B is a perspective view of another embodiment of the connector terminal in FIG. 1;

Fig. 7 is a partially enlarged cross-sectional view of the positioning bar and the fixing block in the channel of the base body in Fig. 2;

FIG. 8A is a partially enlarged cross-sectional view of the connector in FIG. 1 without terminals and when the operating handle is in a horizontal position;

Fig. 8B is a partially enlarged cross-sectional view of the connector in Fig. 1 without terminal assembly and when the operating handle is in the vertical position so that the cam of the camshaft pushes the sliding plate forward;

FIG. 9A is a partially enlarged cross-sectional view of the cover plate, the sliding plate, the base body and the terminals when the operating handle of the connector in FIG. 1 is in the horizontal position;

9B is a partially enlarged cross-sectional view of the cover plate, sliding plate, base body and terminals when the operating handle of the connector in FIG. 1 is in a vertical position.

Please refer to FIG. 1 , the zero insertion force electrical connector of the present invention includes a base body 10 , a sliding plate 70 , a cover plate 50 , a push lever 80 and a terminal 100 .

As shown in FIG. 2 , the top surface of the base body 10 has a substantially square main body portion 12 , and several holes 14 are vertically disposed on the main body portion 12 for accommodating the aforementioned terminals 100 therein. Several protrusions are formed on the left and right sides of the main body 12, including a first protrusion 16 (formed on the upper edge of the left and right sides), a second protrusion 20 (formed on the upper edge of the left and right sides), lower edge), supporting feet 22 (formed between the two second protrusions 20).

A front protruding portion 24 is disposed on the lower edge of the front side of the main body 12 , and a long covering portion 30 is connected to the rear side of the main body 12 . The cross section of the covering part 30 is U-shaped, a pair of end walls 32 and a middle wall 34 extend upward from the junction of the front end 31 of the covering part 30 and the rear end of the square body part 12, and a protrusion 36 extends from the end wall 32. The top edge protrudes upwards. On the edge of the U-shaped groove, opposite to the front end 31 of the covering portion 30 , a rear end 40 vertically extends upward. A shallow horizontal long groove 42 is located on the inner surface of the rear end 40 of the cladding portion 30 facing the U-shaped groove 38 , and forms a step portion 44 thereon. An elongated groove 46 is located at the edge of the horizontal elongated groove 42 with its opening facing the direction of the U-shaped groove 38 , and the horizontal elongated groove 42 extends downward along the right side of the rear end 40 to the bottom of the section of the U-shaped groove 38 At the midpoint, a vertical groove 43 is formed therebetween.

Please refer to FIG. 3 , the cover plate 50 has a generally square main plane 52, and an upright front side wall 53, a left side wall and a right side wall 54 are respectively directed from the left side and the right side of the main plane 52. Extending downwardly, there is no vertical wall at the rear end of the main plane 52. On the lower inner edges of the left side wall and the right side wall 54, there are four spaced apart inwardly protruding claws 56, which can be vertically buckled on the protruding portion 16 of the base body 10 to prevent the cover plate 50 from Detach from the base body 10 upwards. Several holes 58 vertically pass through the main plane 52 and are respectively aligned with the several holes 14 on the base body 10 . A protruding plane 60 protrudes horizontally from the rear of the main plane 52, and a fixed cross bar 62 extends from the rear end of the protruding plane 60, and is processed according to size so that it can be assembled in the elongated groove 46 of the base body middle. A pair of spaced positioning blocks 64 are located behind the main plane 52 and immediately below the protruding plane 60 . It can be clearly seen from the figure that the length of the positioning block 64 is actually equal to or less than the distance between the end wall 32 and the middle wall 34 on the base body 10, so that when the cover plate 50 is combined with the base body 10 , can fit properly in this space without any undue interference. Furthermore, the width of the protruding plane 60 will be smaller than the main plane 52, which is actually equal to the distance between the protruding parts 36 of the base body 10, so the protruding plane 60 can easily pass through the base body 10. The space between the protruding parts 36 of the base body 10 passes through the front end 31 of the covering part 30 of the base body 10 to the rear end 40 thereof to form a complete connector 1 .

Please refer to FIG. 4, which shows a sliding or moving plate 70 sandwiched between the base body 10 and the cover plate 50, the sliding plate includes a roughly square main body 72 and several holes 74 passing through it, and for The channel 14 of the base body 10 and the hole 58 of the cover plate 50 are positive. A pair of locking blocks 76 integrally extend backward from the rear end of the sliding plate 70 . Similar to the positioning block 64 of the cover plate 50 , the length of the locking block 76 is actually equal to or shorter than the distance between the end wall 32 and the middle wall 34 of the base body 10 so as to pass therebetween without hindrance. A front and a rear flange 78 protrude from the side of the sliding plate, can be located on the inner surface of the cover plate 50 with a suitable gap, and can properly guide the sliding plate 70 to move forward and backward along the cover plate.

Please refer to Fig. 5, it shows a combination push lever 80, and it comprises a rotating shaft (or camshaft) 84 and an operating handle 82, wherein rotating shaft 84 is vertically arranged at the rear end of this operating handle 82 integrally, and is Designed to be placed in the U-shaped groove 38 of the base body 10 , the rotating shaft 84 includes three spaced support portions 86 and two cam portions 88 respectively located in the middle of the support portions 86 . In this embodiment, the cross-section of any supporting portion 86 is a complete circle and is completely disposed in the U-shaped groove of the base body 10 to provide support when the operating handle 82 is rotated. Compared with the support portion 86, the cam portion 88 has a small diameter and is not a regular circular shape. When the push lever 80 was rotated around the center of the support portion 86, the cam portion 88 concentric with it was due to its non-circle The contoured surface shape provides a camming effect.

It is worth noting that the block 76 of the sliding plate 70 is facing the pair of separated cam portions 88, therefore, when the push lever 80 rotates around the center of the supporting portion 86, the cam portion 88 can push the sliding plate 70 to make it move toward move forward.

The operating handle 82 is integrally connected to the support portion 86 at one end of the camshaft 84 (the right side in the figure), and has a key 90 that is positioned on the circumference of the support portion and is parallel to the longitudinal axis of the support portion. When the quilt reaches the vertical position, the innermost end 92 of the key 90 can move along the rightmost vertical groove 43 of the covering part 30, and at the same time, the cam part 84 also turns 90° to push the sliding plate 70 forward. The operating handle 82 has an upward offset at the tail end 94 close to its free end, forming a space for easy operation.

6A and 6B, the terminal 100 located in the several holes 14 of the base body 10 has a generally square main body 102 and has a pair of barbs 104 on its opposite sides, so that it can be reliably Engage with the inner wall of the hole 14 of the base body 10 . A tail portion 106 extends downward from the bottom of the main body portion 102 and is soldered into a corresponding hole in a circuit board (not shown) on which the connector is disposed. A movable contact arm 108 and a fixed contact arm 110 extend upwards from the top of the main body 102, and a top part 112 extends vertically outwards from the top of the contact arm 108 integrally; The formed positioning part 114 then extends from another contact arm 110 towards the same direction as the top part 112 at the top of the front contact arm 108. The top part 112 extends from the top end of the fixed contact arm 110 at the same height as the upper horizontal part 116 , and a middle section 118 extends downward from the end of the upper horizontal part 116 to form a first bend. The lower horizontal portion 120 extends from the end of the middle portion 118 toward the same direction as the upper horizontal portion 116 to form a second bent portion. And, the total length of the upper horizontal part 116 and the lower horizontal part 120 of the contact arm 110 is equal to the length of the top part 112 of the other contact arm 108, so the end of the lower horizontal part 120 of the contact arm 110 and the end of the other contact arm 108 The ends are on the same vertical plane.

Please refer to FIG. 7, in order to accommodate the terminal 100, the hole 14 of the base body 10 has a roughly square cross-sectional shape, which is surrounded by the front side arm 141, the rear side wall 142, the left side wall 143 and the right side wall 144. composition. In the tunnel 14 , a pair of positioning blocks 140 are respectively located on the front side wall 141 and the rear side wall 142 , and the pair of positioning blocks 140 extend upward from the bottom of the tunnel 14 to about half the height of the tunnel 14 . The two positioning blocks are integrally connected to the left side wall 143 but maintain a gap with the right side wall 144 . In this embodiment, the gap is equal to the thickness of the main body 102 of the terminal 100, and the right side and the left side of the main body 102 of the terminal 100 can be firmly clamped between the open end 145 and the right side of the positioning block 140. Between the walls 144 , and then can be held in the hole 14 of the base body 10 . It can be understood that the width of the main body 102 of the terminal 100 is actually equal to the distance between the front side wall 141 and the rear side wall 142 of the hole 14, so the left side 107 and the right side 109 of the main body 102 of the terminal 100 can be The barbs 104 are held on the corresponding front sidewall 141 and rear sidewall 142 respectively. In this way, the terminal 100 can be suitably and firmly held in the hole 14 without moving.

In cooperation with the positioning portion 114 of the fixed contact arm 110 of the terminal 100, a positioning rod 146 is vertically arranged in the middle of the left side wall 143 of the hole 14, so that when the horizontal portion 120 below the positioning portion 114 of the terminal 100 receives a forward force, It can be positioned in the front-rear direction by the positioning rod 146 so as not to move. Please refer to FIG. 4 again, the holes 74 of the sliding plate 70 are in a square shape corresponding to the holes 14 of the base body 10, similar to the holes 14, and corresponding to the top part 112 of the contact arm 108 of the terminal 100 has a longitudinal direction. A corner of the push portion 75 and the hole 74 forms a groove 77 for receiving the top end of the top portion 112 of the movable contact arm 108 of the terminal 100 . When the aforementioned sliding plate moves forward, the pushing portion 75 can push the pushing portion 112 of the movable contact arm 108 of the terminal 100 to move forward.

When assembling the utility model connector, when the sliding plate 70 is sandwiched between the cover plate 50 and the base body 10, the cover plate 50 connects its left side with the base body 10 from front to back. The bottom of the right side wall 54 is fixed on the second protrusion 20 of the base body 10 . At the same time, the claw 56 on the cover 50 is buckled on the bottom of the first protruding portion 16 of the base body 10 , so that the cover 50 will not move up and down. Next, place the camshaft 84 of the push lever 80 in the U-shaped groove 38 on the cladding portion 30 of the base body 10, and make the supporting portion 86 of the camshaft 84 firmly installed on the U-shaped groove of the cladding portion 30. In the inner surface of the groove 38 , the cam portion 88 is aligned with the space formed between the end wall 32 and the middle wall 34 , and then the cover plate 50 is tapped backward to the covering portion 30 of the base body 10 . At this time, the operating handle 82 is parallel to the base body 10 , and the innermost end 92 of the key 90 of the push lever 80 is located in the aforementioned vertical groove 43 at the same height as the operating handle 82 .

The aforementioned cover plate 50 moves backward until the rear end of its main plane 52 engages with the end wall 32 and the middle wall 34 of the base body 10, and the rear end of the side wall 54 engages with the end wall 32 of the base body 10, The front sidewall 53 is located on the front protrusion 24 of the base body 10 . At this time, the protruding plane 60 of the cover plate 50 extends to the covering portion 30 of the base body 10 and covers the U-shaped groove 38 , the front end of the protruding plane 60 is in contact with the end wall 32 and the middle wall 34 of the base body 10 The top ends are relatively straight, and the rear ends are accommodated in the horizontal slot 42 of the covering portion 30 and engaged with the step portion 44 . It can be understood that the protruding plane 60 is positioned between the protruding parts 36 at the top of the end wall 32 of the base body 10 , and the fixed cross bar 62 at the rear end of the protruding plane 60 is received in the elongated groove 46 at the rear end 40 of the covering part 30 In this way, the protruding plane 60 covers and covers the U-shaped groove 38 and the camshaft 84 of the push lever 80 located therein.

It can be understood that the two blocks 76 protruding from the rear end of the sliding plate 70 sandwiched between the cover plate 50 and the base body 10 can pass between the end wall 32 and the middle wall 34 of the base body 10 The space protrudes in the U-shaped groove 38 of the covering part 30, and aligns with the cam part 88 of the pushing lever 80. The positioning block 64 that is located below the real exit plane 60 of the cover plate 50 and extends from the rear end of the main plane 52 can pass through the aforementioned space and protrude in the U-shaped groove 38 of the covering part 30, but it is not connected with the push lever. Cam portion 88 of 80 is in contact. In this case, the locking block 76 of the sliding plate 70 is located below the positioning block 64 of the cover plate 50 , and the positioning block 64 provides a guiding function for the locking block 76 of the sliding plate 70 to move forward and backward. In addition, due to the effect of the front side wall 53 and the left and right side walls 54 of the cover plate 50, the sliding plate 70 will not move forward or in the left and right direction. Furthermore, since the rear end of the sliding plate 70 is engaged with the end wall 32 and the middle wall 34 of the base body 10, it will not move backward. In this way, the holes 58 of the cover plate 50 , the holes 74 of the sliding plate 70 and the holes 14 of the base body 10 are aligned in a vertical direction to accommodate a plurality of terminals 100 and pins of the PGA chip carrier.

Several terminals 100 are inserted thereinto from the bottom of the channel 14 of the base body 10. As previously mentioned, the main body 102 of the terminal 100 is fixed in the channel 14 by the barbs 104 on both sides, so that the movable contact arm 108 of the terminal 100 The top part 112 and the upper horizontal part 116 of the positioning part 114 of the fixed contact arm 110 protrude from the hole 14 of the base body 10 and extend into the hole 74 of the sliding plate 70 . The end of the above-mentioned top part 112 extends into the groove 77 of the hole 74 . On the other hand, the tail portion 106 of the terminal 100 extends downwards out of the base body 10 so that the connector 1 can be soldered thereon when it is placed on the circuit board.

Please refer to Fig. 8A and Fig. 8B, when a PGA chip carrier must be electrically connected and affixed on the connector 1, the operating handle 82 of the push lever 80 is inserted into the U-shaped groove 38 by the original front position (or horizontal position). The support portion 86 of the push lever 80 is turned upwards to the vertical position as a fulcrum, so that the cam portion 88 of the push lever 80 rotates 90° in the U-shaped groove 38, and the block 76 of the slide plate 70 is pushed to make the slide plate 70 relative to the base The seat body 10 produces a forward displacement.

As shown in Figure 9A and Figure 9B, due to the forward movement of the slide plate 70, the pushing part 75 of the hole 74 pushes the end of the top part 112 of the terminal 100 in the groove 77 of the hole 74, so that the activity of the terminal 100 The top part 112 of the contact arm 108 produces an oblique displacement. Since there is a large gap between the inner rear surface 73 of the hole 74 of the sliding plate 70 and the positioning portion 114 of the fixed contact arm 110 of the terminal 100 , the forward movement of the sliding plate 70 will not displace the positioning portion 114 . It can be seen from FIG. 9B that when the sliding plate 70 is at its frontmost position, the inner surface 73 of the hole 74 is just at the edge of the positioning portion 114 of the fixed contact arm 110, so there is no gap between the positioning portion 114 and the sliding plate 70. There will be an interaction force.

Furthermore, although the aforementioned movable contact arm 108 is pushed forward by the slide plate 70, the fixed contact arm 110 of the terminal 100 remains stationary due to the action of the positioning rod 146 in the hole 14. Therefore, for any terminal 100 , the space (or distance) between the upper horizontal portion 116 of the positioning portion 114 of the fixed contact arm 110 and the top portion 112 of the movable contact arm 108 increases due to the advancement of the movable contact arm 108 . This enlarged space (or distance) is larger than the diameter (or size) of the conductive pins of the PA chip carrier to be inserted into the connector 1 . Like this, this conductive pin can be inserted therebetween with a zero insertion force (ZIF), and this situation is shown in Figure 9B, and connector 1 and its internal terminal 100 are under a fully opened or working condition to accommodate a PGA chip carrier .

Please refer to Fig. 9A and Fig. 9B, wherein, in the process of moving forward of the sliding plate 70, the cover plate 50 will move forward because the front side end of the sliding plate 70 abuts against the front side wall 53 of the cover plate 50, that is The cover plate 50 and the sliding plate 70 are displaced in the same direction relative to the base body 10 .

When the PGA chip carrier is placed on the connector 1, its conductive pins pass through the hole 58 of the cover plate 50 and the hole 74 of the sliding plate 70 to be clamped on the upper horizontal part 116 and the movable contact of the fixed contact arm 110 of the terminal 100. In the space between the tops 112 of the arms 108 . The ends of the PGA chip carrier pins may be further inserted into the holes 14 of the base body 10 . Then the operating handle 82 of the push lever 80 is turned from its vertical position to the horizontal position, and the camshaft 84 is rotated 90° to get back to its original position. The cam portion 88 rotates backwards from the horizontal position without sliding. The block 76 of the plate 70 is in contact with each other, and the sliding plate 70 is deformed due to the pushing part 75 in the hole 74 pushing the top part 112 of the movable contact arm 108 of the terminal 100. At this time, due to the movable contact arm 108 of the terminal 100 spring back to its original position due to internal stress.

When the top part 112 of the movable contact arm 108 bounced back to its normal position, the PGA chip carrier would move backward due to the rebound of the top part 112 of the movable contact arm 108 of the terminal 100, and due to the movement of the PGA chip carrier The size of the pins is just in line with the diameter of the holes 58 of the cover 50, and the backward movement of the pins of the PGA chip carrier will push the holes 58 of the cover 50 to move back and forth until the cover 50 returns to its original position. When the connector 1 returns to its original state, it is in a completely closed or closed state to realize the transmission of electrical signals. In this state, the pins of the PGA chip carrier are electrically and mechanically clamped Between the top part 112 of the movable contact arm 108 of the terminal 100 and the upper horizontal part 116 of the positioning part 114 of the fixed contact arm 110 . In the original design, this distance is somewhat smaller than the diameter of the conductive pins of the PGA chip carrier, thus providing a good and reliable electrical connection between the connector 1 and the chip carrier. It can be understood that the PGA chip carrier can be released or taken out from the connector 1 as long as the above steps are reversed.

In order to further limit the forward and backward movement of the cover plate 50 relative to the base body 10, a protrusion 17 (only one of them is shown in the figure) is respectively set on the side of the base body 10, and the cover plate The protruding claw 56 on the side wall 54 can engage with the side protruding part 17 of the base body 10, so that the cover plate 50 can only move within the distance limited between the two rear protruding claws 56 of the same side wall 54, It is unlikely that the PGA chip carrier will move forward too far and fall out of the base body 10 when the PGA chip carrier is not placed.

In order to keep the operating handle 82 in a horizontal position and to maintain the entire connector 1 in a stable state, we design a bulge 55 on the outer surface of the right side wall 54 of the cover plate 50, which is matched with one of the operating handles 82. The notch 83, the bulge 55 on the right side wall 54 of the cover plate 50 and the notch 83 on the operating handle 82 can lock each other when the operating handle 82 is put down, so that the push lever 80 will not be released from the base body 10. Upward rotation lifts the hazard. The operation handle 82 of the aforementioned push lever 80 can be placed on the middle protrusion 20 of the base body 10 without being rotated downward from the horizontal position. Due to the effect of the key 90 on the push lever 80 and the vertical groove 43 on the covering part 30, the upward rotation of the aforementioned operating handle 82 can be guided and restricted, and since the block 76 of the sliding plate 70 is clamped on the two ends of the camshaft 84 Between the supporting parts 86 , the pushing lever 80 can be prevented from moving along the axial direction of the U-shaped groove 38 .

The shapes of the central opening 11 of the base body 10 and the central opening 71 of the sliding plate 70 are designed to maximize the size of the openings and maintain the maximum strength of the base body 10 and the sliding plate 70 . The through hole H1 on the cover plate 50, the through hole H2 on the sliding plate 70, and the first protruding portion 16 and the second protruding portion 20 on the base body 10 are intentionally arranged in a staggered manner for ease of molding.

If the lengths of the two contact arms 108 and 110 of the terminal 100 are greater than the height of the main body 102 , the contact arms 110 will move in opposite directions. That is, when the contact arm 108 is pushed forward by the slide plate 70, the contact arm 110 will move backward. In this case, the positioning rod in the hole 14 will no longer perform the function of the stopper, but only perform the function of guiding the positioning part 114 of the contact arm 110 and the top of the contact arm 108 when the terminal 100 is inserted therein from the bottom of the hole 14 . The function of the control unit 112. In contrast, in a simpler design that does not consider the positioning of the terminals, the lower horizontal portion 120 and the middle portion 118 of the contact arm 110 and the positioning rod 146 in the hole 14 can be eliminated from the previous design.

Although the three-piece PGA connector is used as an example for illustration above, the same principle applies to the two-piece PGA connector (one cover and one base body).

Claims (2)

1. A zero-insertion force electrical connector, characterized in that it comprises: a base body with a top surface and several holes vertically passing through it; a cover plate slidably arranged on the base body The top surface, and has several holes vertically passing through it corresponding to several channels of the base body; several terminals are correspondingly arranged in the channels of the base body, and the pins of the chip carrier are pushed through the cover plate to enter with zero insertion force Hole; a push lever made of polymer material, including an operating handle and a rotating shaft, the rotating shaft is vertically arranged at one end of the operating handle, and placed between the base body and the cover plate. 2. The zero-insertion-force electrical connector according to claim 1, further comprising a sliding plate sandwiched between the base body and the cover plate, several vertically penetrating therebetween and corresponding to the base The hole of the channel of the seat body, the sliding plate pushes the terminal through the operation of the push lever.

Images