CN100481620C - Planar grid array electric connector and electric conducting terminal thereof - Google Patents

Abstract

The present invention reveals one kind of electric planar grid array connector and its conducting terminal. The electric connector includes insulating main body and conducting terminal, and the conducting terminal has support plate with tail in its one end and elastic part in the other end. The elastic part consists of even sections of elastic arms connected each other, and two adjacent elastic arms extend obliquely in opposite directions. The last elastic arm in the tail of the elastic part has arced contact part in the free end, and when the contact part of conducting terminal is pressed, all the elastic arms produce deformation to ensure the excellent elasticity of the conducting terminal. The adjacent elastic arms with opposite rotation directions can reduce horizontal shift in the contact part and less terminal wear.

Description

Electric connector of planar grid array and conducting terminal thereof

[technical field]

The invention relates to a kind of electric connector of planar grid array and conducting terminal thereof, particularly about a kind of electric connector of planar grid array and conducting terminal thereof that electrically connects in order to foundation between LGA (Land Grid Array) packaging body and printed circuit board (PCB).

[background technology]

The stitch of integrated circuit package body is arranged in the LGA mode, is called the LGA packaging body.LGA Socket is an electric connector of planar grid array, is a kind of electric connector that conducting terminal is arranged with array way, and the LGA packaging body bottom surface of Pei Heing is provided with guide-joining plate with it, and this guide-joining plate connects in the mode of pressing down mutually with the conducting terminal of electric connector.

Fig. 1 is the assembled sectional view of the existing a kind of electric connector of planar grid array of connector industry and conducting terminal 80 and LGA packaging body 41 and printed circuit board (PCB) 51.Contain plurality of conductive terminals 80 in the insulating body 31 of electric connector, this conducting terminal 80 comprises support chip 81, be located at respectively on the support chip 81, the elastic arm 84 and the weld part 86 of lower end, and the free-ended contact site 842 of being located at elastic arm 84, contact site 842 extends upward the upper surface of insulating body 31, with with LGA packaging body 41 on the guide-joining plate 412 of corresponding setting contact, weld part 86 extends the lower surface of insulating body 31 downwards, can be on it by welding tin ball 61 with printed circuit board (PCB) 51 on set corresponding pad 512 connect mutually with the surface soldered technical approach, thereby the electric connection of setting up 51 of LGA packaging body 41 and printed circuit board (PCB)s.

But the terminal arranging density of the electric connector of planar grid array of existing design can not reach high requirement, and also there is obvious deficiency in its conducting terminal 80 aspect elasticity and the connection reliability thereof, if elastic arm 84 designs are shorter, then the elasticity of elastic arm 84 is relatively poor, elastic arm 84 will cause elastic arm 84 to produce inelastic deformations and can't restore to the original state under the situation of pressurized repeatedly.If 84 designs of the elastic arm of conducting terminal 80 are longer, then during contact site 842 pressurizeds of conducting terminal 80, elastic arm 84 rotates relative support chip 81, make contact site 842 on the guide-joining plate 412 of LGA packaging body 41, produce bigger horizontal displacement, and because of 412 of contact site 842 and guide-joining plates have bigger relative contact pressure, so the contact site 842 of conducting terminal 80 weares and teares greatly because of sliding easily, simultaneously with the guide-joining plate 412 of scratch LGA packaging body 41.And longer because of elastic arm 84 designs, certainly will increase conducting terminal 80 level interval to each other in the insulating body 31, make that conducting terminal 80 density in the insulating body 31 descend, this and the miniaturization of electric equipment trend, highdensity developing direction are disagreed.In view of above-mentioned disappearance, be necessary to design new planar lattice array electricity and conducting terminal thereof to overcome above-mentioned defective.

[summary of the invention]

The object of the present invention is to provide a kind of electric connector of planar grid array and conducting terminal thereof, the elastic arm of the conducting terminal of this electric connector has favorable elasticity, and when the contact site of conducting terminal connected in the mode of pressing down mutually with the guide-joining plate of LGA packaging body, its contact site only produced less relative horizontal slip on the guide-joining plate surface.

The object of the present invention is achieved like this: electric connector of planar grid array comprises insulating body and conducting terminal, insulating body is provided with the plurality of terminals accepting hole, conducting terminal is contained in the terminal accommodation holes, conducting terminal is provided with support chip, support chip one end is provided with afterbody, the other end of support chip is provided with elastic portion, this elastic portion is made up of two sections elastic arms that extend that are connected to each other at least, the free end of the elastic arm of elastic portion least significant end is provided with arc-shaped contact part, directly be connected with in the elastic arm and the support chip of support chip and form obtuse-angulate first bending, form second bending between each elastic arm, when the contact site pressurized, the direction of rotation of adjacent elastic arm makes contact site only produce less displacement in the horizontal direction.

Compared with prior art, the invention has the advantages that: the conducting terminal of electric connector of planar grid array is provided with the elastic portion of being made up of the elastic arm of two sections extensions that are connected to each other at least, during the contact site pressurized of conducting terminal, each elastic arm all can produce deformation and have favorable elasticity to guarantee conducting terminal, and the horizontal movement direction of the contact cloth that elastic arm produced adjacent one another are is opposite, so just, can reduce the slip of contact site in horizontal direction, because it is less that the contact site of conducting terminal slides, set up stable being electrically conducted so can just scrape the guide-joining plate formed oxide-film in surface of LGA packaging body off with the LGA packaging body, cause the conducting terminal wearing and tearing and can not produce big horizontal slip in the guide-joining plate surface of LGA packaging body because of the contact site of conducting terminal.

[description of drawings]

Fig. 1 is the assembled sectional view of existing electric connector of planar grid array and conducting terminal and LGA packaging body and printed circuit board (PCB).

Fig. 2 is the stereogram of the conducting terminal of electric connector of planar grid array of the present invention.

Fig. 3 is the end view of the conducting terminal of electric connector of planar grid array of the present invention.

Fig. 4 is electric connector of planar grid array of the present invention and conducting terminal and LGA packaging body and the preceding cutaway view of circuit board combination.

Fig. 5 is the cutaway view after electric connector of planar grid array of the present invention and conducting terminal and LGA packaging body and the circuit board combination.

Fig. 6 is the end view of the conducting terminal of the electric connector of planar grid array of another execution mode of the present invention.

Fig. 7 is the electric connector of planar grid array of another execution mode of the present invention and the cutaway view before conducting terminal and LGA packaging body and the circuit board combination thereof.

Fig. 8 is the electric connector of planar grid array of another execution mode of the present invention and the cutaway view after conducting terminal and LGA packaging body and the circuit board combination thereof.

[embodiment]

Please in conjunction with consulting Fig. 2, Fig. 3 and Fig. 4, electric connector of planar grid array 1 of the present invention electrically connects thereby set up between LGA packaging body 40 and circuit board 50 in order to accept LGA packaging body 40 and it is incorporated into circuit board 50.This electric connector 1 comprises insulating body 30, conducting terminal 10.Conducting terminal 10 is provided with support chip 12, and support chip 12 is provided with holding parts 122, is provided with protruding thorn 124 in the both sides of holding parts 122, is provided with an afterbody 18 in the lower end of support chip 12, and these afterbody 18 levels are bent to form one and plant ball plane 182 towards circuit board 50.The upper end of support chip 12 is extended obliquely and is provided with first elastic arm 14, forms first bending 125 between this first elastic arm 14 and the support chip 12, and first elastic arm 14 is spent greater than 90 with the angle of 12 of support chips.The end of first elastic arm 14 is connected with second elastic arm, 16, the first elastic arms 14 and second elastic arm 16 that extend obliquely and constitutes elastic portion 13.The bearing of trend of two elastic arms on horizontal direction is opposite, is formed with second bending 127 between first elastic arm 14 and second elastic arm 16, and first elastic arm 14 and 16 formation of second elastic arm, one angle.Free end in second elastic arm 16 is provided with arc-shaped contact part 162, and contact site 162 roughly is in same vertical position with support chip 12.

Conducting terminal 10 is contained in the terminal accommodation holes 302 of insulating body 30 of electric connector 1, this terminal accommodation holes 302 is provided with first madial wall 304 and second madial wall 306, support chip 12 is close to first madial wall 304 of terminal accommodation holes 302, and the protruding thorn 124 of the holding parts 122 of support chip 12 is fixed in conducting terminal 10 in the terminal accommodation holes 302 with the respective side walls interference of terminal accommodation holes 302.First elastic arm 14 extends obliquely towards second madial wall 306, and second elastic arm 16 extends obliquely towards first madial wall 304.Second bending 127 of conducting terminal 10 is contained in the terminal accommodation holes 302, and 306 of second madial walls of itself and terminal accommodation holes 302 leave the gap, a strain space is reserved in second bending 127 that is conducting terminal 10, and second madial wall 306 of terminal accommodation holes 302 bends 127 interferences with second when preventing conducting terminal 10 pressurizeds.Afterbody 18 stretches out the lower surface of insulating body 30, planting of afterbody 18 is welded with tin ball 60 on the ball plane 182, this tin ball 60 is connected to pad set on the printed circuit board (PCB) 50 502, the contact site 162 of conducting terminal 10 stretches out the upper surface of insulating body 30 and is resisted against guide-joining plate set on the LGA packaging body 40 402, thereby sets up conductive path between LGA packaging body 40, electric connector 1 and circuit board 50.

Please in conjunction with consulting Fig. 3 to Fig. 5, when the contact site 162 of conducting terminal 10 connects in the mode of pressing down mutually with the guide-joining plate 402 of LGA packaging body 40, cause first elastic arm 14 and second elastic arm 16 produce deformation respectively in the opposite direction, so can design shortlyer relatively under the prerequisite of favorable elasticity guaranteeing that conducting terminal 10 has, with conducting terminal 10 level interval to each other in the insulating body 30 that reduces electric connector 1, thus the arranging density of raising conducting terminal 10.On the other hand, because conducting terminal 10 pressurizeds, first elastic arm 14 and second elastic arm 16 will be respectively with respect to first bending, 125 and second bending 127 rotate moment M1 and M2, the direction of rotation of two moments, so under M1 and M2 act on respectively, first elastic arm 14 is also opposite with the horizontal movement direction of second elastic arm 16, make contact site 162 only produce less horizontal slip on guide-joining plate 402 surfaces of LGA packaging body 40, thereby assurance just scrapes the guide-joining plate 402 surperficial formed oxide-films of LGA packaging body 40 off and sets up stable being electrically conducted with the LGA packaging body, and avoid causing greatly the excessive wear of contact site 162, thereby the useful life of improving conducting terminal 10 because of the horizontal slip of contact site 162.

Please in conjunction with consulting Fig. 6 to Fig. 8, electric connector of planar grid array 1 ' and the another kind of execution mode of conducting terminal in, the support chip 12 of its conducting terminal ' elastic portion 13 ' can be by one section first elastic arm 14 ' and multistage second elastic arm 16 ' constitute.First elastic arm 14 ' be connected in support chip 12 ' terminal and extend obliquely, first elastic arm 14 ' with first bending 125 of support chip 12 ' formation ', and first elastic arm 14 ' and support chip 12 ' angle greater than 90 degree, multistage second elastic arm 16 ' be connected with each other and alternately towards terminal accommodation holes 302 ' first madial wall 304 ' or second madial wall 306 ' extend obliquely, and form a plurality of second the bending 127 ', second bending 127 adjacent one another are ' opening direction opposite, second elastic arm 16 of arc-shaped contact part 162 ' be located at least significant end ' free section, and near arc-shaped contact part 162 ' second bending 127 ' also be contained in terminal accommodation holes 302 ' in.In support chip 12 ' the lower end be provided with an afterbody 18 ', this afterbody 18 ' level be bent to form one towards circuit board 50 ' plant ball plane 182 '.Each second bending 127 ' with terminal accommodation holes 302 ' madial wall between all leave the space, terminal accommodation holes 302 when preventing conducting terminal 10 ' pressurized ' each madial wall and second bend 127 ' interference.During conducting terminal 10 ' pressurized, elastic portion 13 ' each section elastic arm all can produce deformation, so can under the prerequisite that guarantees conducting terminal 10 ' have favorable elasticity, design elastic arm shorter relatively, with reduce electric connector 1 ' the level interval of insulating body 30 ' middle conducting terminal 10 ' to each other, improve conducting terminal 10 ' arranging density.On the other hand, will in the bending of its correspondence, rotate the respectively moment and the direction of rotation of adjacent two rotating torques of conducting terminal 10 ' pressurized, each section elastic arm.So under each rotating torque effect, contact site 162 ' general only LGA packaging body 40 ' guide-joining plate 402 ' surface produce less horizontal slip.Thereby guarantee just to scrape off LGA packaging body 40 ' guide-joining plate 402 ' surperficial formed oxide-film and stablize with LGA packaging body 40 ' foundations be electrically conducted, avoid because of contact site 162 ' horizontal slip greatly cause contact site 162 ' excessive wear, thereby improve conducting terminal 10 ' useful life.It is pointed out that between each elastic arm of conducting terminal of electric connector except forming bending, can also to twist that promptly the bearing of trend obliquely of each elastic arm can be not limited in a certain perpendicular.This kind design also can guarantee that conducting terminal has favorable elasticity, reduces the wearing and tearing of conducting terminal contact site, thereby reaches the purpose of the terminal arranging density that improves conducting terminal useful life and electric connector of planar grid array.

Claims (10)

1. electric connector of planar grid array, it comprises insulating body and conducting terminal, insulating body is provided with terminal accommodation holes, conducting terminal is contained in the terminal accommodation holes, this conducting terminal is provided with support chip, support chip one end is provided with afterbody, the other end of support chip is provided with elastic portion, the free end of the elastic arm of elastic portion least significant end is provided with arc-shaped contact part, it is characterized in that: this elastic portion is alternately rearranged by at least two sections even number section elastic arm, directly be connected with in the elastic arm and the support chip of support chip and form an obtuse-angulate bending, and also form bending between each elastic arm, the opening direction of bending adjacent one another are is opposite, and the bending near contact site is contained in the terminal accommodation holes, when the contact site pressurized, per two adjacent elastic arms in the bending of its correspondence, rotate the respectively moment and the direction of rotation of adjacent two rotating torques.

2. electric connector of planar grid array as claimed in claim 1 is characterized in that: adjacent two elastic arms are connected with each other and roughly extend obliquely in opposite direction.

3. electric connector of planar grid array as claimed in claim 2 is characterized in that: terminal accommodation holes is formed with first madial wall and second madial wall, leaves the gap between the formed bending and first madial wall and second madial wall between elastic arm.

4. electric connector of planar grid array as claimed in claim 3 is characterized in that: a side of support chip is close to first madial wall of terminal accommodation holes.

5. electric connector of planar grid array as claimed in claim 1 is characterized in that: contact site and support chip are in same vertical direction.

6. conducting terminal, it comprises support chip, be located at the afterbody of support chip one end, be connected with in the elastic portion of the support chip other end, this elastic portion is made up of some even number sections elastic arm that extends that is connected to each other, the free end of the elastic arm of elastic portion least significant end is provided with contact site, it is characterized in that: be connected with the bending that constitutes an obtuse angle in the elastic arm and the support chip of support chip, and also be formed with bending between adjacent elastic arm, the opening direction of bending adjacent one another are is opposite, and the bending near contact site is contained in the terminal accommodation holes, when the contact site pressurized, per two adjacent elastic arms moment that in the bending of its correspondence, rotates respectively, and the direction of rotation of adjacent two rotating torques, and contact site only produces less displacement in the horizontal direction.

7. conducting terminal as claimed in claim 6 is characterized in that: elastic arm is the even number section, and adjacent two elastic arms are connected with each other and roughly extension obliquely in opposite direction.

8. conducting terminal as claimed in claim 7 is characterized in that: the opening direction of adjacent two bendings is opposite.

9. conducting terminal as claimed in claim 8 is characterized in that: contact site and support chip roughly are in same vertical direction.

10. conducting terminal as claimed in claim 9 is characterized in that: the free end of the elastic arm of least significant end is provided with arc-shaped contact part.

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