Source: http://www.google.fr/patents/US8083528
Timestamp: 2013-06-19 08:54:24
Document Index: 409227280

Matched Legal Cases: ['art 12', 'art 12', 'art 12', 'art 11', 'art 11', 'arts 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'arts 11', 'art 11', 'art 11', 'arts 11', 'art 11', 'art 11', 'art 11', 'art 11', 'arts 11', 'arts 11', 'art 12', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'art 11', 'art 11', 'art 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'art 11', 'art 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'arts 11', 'art 11', 'art 11', 'arts 11', 'art 11', 'art 11', 'arts 11', 'arts 11', 'arts 11', 'art 12', 'arts 11', 'arts 11', 'arts 11', 'arts 12', 'arts 12', 'art 11', 'art 11']

Brevet US8083528 - Connector, electronic device, and method of manufacturing electronic device - Google�BrevetsRecherche Images Maps Play YouTube Actualit�s Gmail Drive Plus » Recherche avanc�e dans les brevets | Historique Web | Connexion Recherche avanc�e dans les brevets BrevetsA connector includes a contact pin in which a free end projecting from a supporting member comes into contact with an electrode of a first object and a second object, and a bending part is provided onto a base end such that the connector has an inclination against the first object and the second object....http://www.google.fr/patents/US8083528?utm_source=gb-gplus-shareBrevet US8083528 - Connector, electronic device, and method of manufacturing electronic device Num�ro de publicationUS8083528 B2Type de publicationOctroi Num�ro de demande12/553,610 Date de publication27 d�c. 2011 Date de d�p�t3 sept. 2009 Date de priorit�29 mars 2007Autre r�f�rence de publicationUS20090325401, WO2008120278A1 Num�ro de publication12553610, 553610, US 8083528 B2, US 8083528B2, US-B2-8083528, US8083528 B2, US8083528B2 InventeursMakoto Sakairi, Nobutaka Itoh, Yoshiteru Ochi, Yoko Kobayashi Cessionnaire d'origineFujitsu LimitedCitations de brevets (17), Citations hors brevets (1), Classifications (6) Liens externes: USPTO, Cession USPTO, EspacenetConnector, electronic device, and method of manufacturing electronic deviceUS 8083528 B2 R�sum� A connector includes a contact pin in which a free end projecting from a supporting member comes into contact with an electrode of a first object and a second object, and a bending part is provided onto a base end such that the connector has an inclination against the first object and the second object. The rigidity of the bending parts is selectively set to be high by selectively increasing a thickness of the bending part.
CROSS REFERENCE TO RELATED APPLICATIONS This application is a continuation of PCT application PCT/JP2007/000335, which was filed on Mar. 29, 2007.
FIELD The present invention relates to a connector electrically connecting electrodes, and an electronic device including the connector and a method of producing the same.
BACKGROUND In order to electrically connect an electrode of an electronic component such as an LSI (Large Scale Integrated Circuit) package and an electrode of a wiring board, a BGA (Ball Grid Array) method of directly soldering the electrode to the wiring board or an LGA (Land Grid Array) connector method, which will be described later, have been conventionally used.
Patent Document 1: Japanese Laid-open Patent Publication No. 2006-49260 Patent Document 2: Japanese Laid-open Patent Publication No. 2001-176580 Patent Document 3: Japanese Laid-open Patent Publication No. 09-82747 SUMMARY An object of the present invention is to provide a connector capable of improving the security of the connection between electrodes of the LGA or the like in the assembly of an electronic device, and to provide an electronic device and a method of producing the same.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic cross-sectional diagram illustrating one example of an electronic device 1 according to one embodiment of the present invention.
DESCRIPTION OF EMBODIMENTS FIG. 1 is a schematic cross-sectional diagram illustrating one example of an electronic device 1 according to one embodiment of the present invention.
In FIG. 1, an electronic device 1 includes an LGA (Land Grid Array) connector (hereinafter, simply referred to as �connector�), a system board 20 as a first object (wiring board), an IC package 30 as a second object (electronic component), a heatsink base 40, a bolster plate 50, or the like.
The connector 10 is comprised of a contact pin 11, a pin holding part 12 as a supporting member made of resin holding the contact pin 11 at a base end 11 c, a supporting plate 13 as a supporting member made of stainless steel supporting the pin holding part 12 in which an aperture 13 a is formed in the middle, and a top flange 14 and a bottom flange 15 sandwiching the edge of the supporting plate 13.
The contact pin 11 is a thin metal plate in which, as illustrated in FIG. 5, all of the following are integrated: a board side end 11 a forming a contact parallel to the system board 20, a board side arm 11 b functioning as a first arm extending straight towards the system board 20 with an inclination from a base end 11 c to a board side end 11 a, a base end 11 c extending perpendicular to the system board 20 and the IC package 30 and sandwiched and held by the holding part 12, a package side arm 11 d functioning as a second arm extending straight towards the IC package 30 with an inclination from the base end 11 c to a board side end 11 e, and a package side end 11 e functioning as a free end projecting from the holding member 12 and the supporting plate 13 as a supporting member forming a contact parallel to the IC package 30, all of which are free ends projecting from the holding member 12 and the supporting plate 13 as supporting members.
In addition, a board side bending part 11 f and a package side bending part 11 g are provided to the base end 11 c, and thereby the board side arm 11 b and the package side arm 11 d have an inclination respectively against the system board 20 and the IC package 30.
Moreover, when pressure is applied to the connector 10, only the ends 11 a and 11 e of the contact pin 11 come into contact with the board side electrode pad 21 and the IC package side electrode pad 34, but the supporting plate 13, the top flange 14, and the bottom flange 15 do not come into contact with the system board 20, the IC package 30, or the like, as illustrated in FIG. 3.
Furthermore, the board side arm 11 b and the package side arm 11 d according to the present embodiment extend straight from the bending parts 11 f and 11 g provided at the base end 11 c to the ends 11 a and 11 b, but may be in a bent shape.
In the contact pin 11, the rigidity of the board side bending part 11 f is selectively increased by increasing the thickness (t0) of the board side bending part 11 f. Specifically, a reinforcement part 11 h is provided to the board side bending part 11 f by welding or the like, and thus the thickness (t0) of the board side bending part 11 f is larger than the thickness (t1) of the other parts continuous to the board side bending part 11 f, such as the base end 11 c and the board side arm 11 b. In a similar manner, a reinforcement part 11 i is provided to the package side bending part 11 g by welding or the like, and as illustrated in FIG. 7, the thickness (t0) of the package side bending part 11 g is larger than the thickness (t1) of the other parts continuous to the package side bending part 11 g such as the base end 11 c and the package side arm 11 d. The rigidity may be increased, for example by integrally molding the reinforcement parts 11 h and 11 i the contact pin 11 such that the thicknesses (t0) of the board side bending part 11 f and the package side bending part 11 g are larger than the thickness (t1) of the other parts, without arranging the separate reinforcement parts 11 h and 11 i onto the board side bending part 11 f and package side bending part 11 g. FIG. 8 is an explanatory diagram illustrating a sliding direction of the contact pin 11 according to the present embodiment.
The contact pin 11 of FIG. 8 is in a state where the board side end 11 a and package side end 11 e respectively come into contact with the board side electrode pad 21 and the package side electrode pad 34. Moreover, contact surfaces 21 a and 34 a of the electrode pads 21 and 34 that come into contact with the contact pin 11 are roughened.
When pressure is applied to the contact pin 11 via the screws 60 or the like, the bending angle of the board side bending part 11 f and package side bending part 11 g becomes larger, and thereby the contact pin 11 starts bending. Then, the contact pin 11 (ends 11 a, 11 e) slides on the contact surfaces 21 a and 34 a of the electrode pads 21 and 34.
The amount of sliding of the contact pin 11 (ends 11 a, 11 e) increases in proportion to the amount of bending. In the present embodiment, however, a necessary level of pressure can be secured with a small amount of bending, i.e., a small amount of sliding, as the rigidity of the bending parts 11 f and 11 g of the contact pin 11 is set to be high.
As the board side arm 11 b and the package side arm 11 d incline towards the right in FIG. 8 from the bending parts 11 f and 11 g provided to the base end 11 c to the board side end 11 a and the package side end 11 e, the sliding direction S of the contact pin 11 (ends 11 a, 11 e) is to the right while the holding part 12 moves to the left in FIG. 8. Accordingly, the amount of sliding of the contact pin 11 (ends 11 a, 11 e) in the sliding direction S becomes small, as described in the above.
FIG. 9 is a characteristic diagram illustrating the relationship between the change in thickness (t0) of the bending parts 11 f and 11 g of the contact pin 11 and the amount of sliding, according to the present embodiment. Based on the premise that the thickness is �1� when the thickness (t0) of the bending parts 11 f and 11 g is the same as the thickness (t1) of the base end 11 c or the arms 11 b and 11 d, and that the amount of sliding of the contact thereof is �1�, the amount of sliding decreases to �approximately 0.8� if the thickness (t0) of the bending parts 11 f and 11 g is made to �1.05�.
As thickness (t0) increases to �1.1�, �1.2�, �1.25�, and �1.5�, the amount of sliding decreases to �approximately 0.7�, �approximately 0.6�, �approximately 0.5�, and �approximately 0.3�.
As long as the amount of sliding of the contact pin 11 decreases by about 20%, even if an error due to the shape of the bending parts 11 f and 11 g or the like are included, the amount of sliding of the contact pin 11 can be sufficiently reduced. Therefore, the thickness (t0) of the bending parts 11 f and 11 g is desirably equal to or greater than 1.05 times as thick as the thickness (t1) of the base end 11 c and the arms 11 b and 11 d. The rigidity may be increased by varying the material for the bending parts 11 f and 11 g from the other continuous parts (base end 11 c and board side arm 11 b, or package side arm 11 d), without increasing the thickness.
FIG. 10 is a characteristic diagram illustrating the relationship between the change in the Young's modulus depending on a modification of the bending parts 11 f and 11 g and the amount of sliding, according to the present embodiment.
On the basis of the premises that the Young's modulus is �1� when the Young's modulus of the material of the board side bending part 11 f and the package side bending part 11 g is the same as the Young's modulus of the material of the base end 11 c or the arms 11 b and 11 d, and that the amount of sliding of the contact pin 11 thereof is �1�, the amount of sliding decreases to �approximately 0.9�, �approximately 0.8�, �approximately 0.75�, and �approximately 0.65� as the Young's modulus of the material of the bending part 11 f and 11 g is increased to �1.1�, �1.2�, �1.3�, �1.4�, and �1.5�, as shown in FIG. 10.
As long as the amount of sliding of the contact pin 11 decreases by about 20%, even if an error due to the shape of the bending parts 11 f and 11 g or the like are included, the amount of sliding of the contact pin 11 can be sufficiently reduced. Therefore, if the material of the bending parts 11 f and 11 g is to be varied from the material of the base end 11 c or the arms 11 b and 11 d, the Young's modulus of the material of the bending parts 11 f and 11 g is desirably equal to or greater than 1.2 times the Young's modulus of the base end 11 c and the arms 11 b and 11 d. In order to vary the material of the bending parts 11 f and 11 g from the material of the base end 11 c or the arms 11 b and 11 d, the bending parts 11 f and 11 g need to be arranged continuously up to the base end 11 c or the arms 11 b and 11 d of a different material, for example, by welding. A material whose Young's modulus is higher than the material of the base end 11 c or the arms 11 b and 11 d can effectively be used for the reinforcement parts 11 h and 11 i. FIG. 11 is a characteristic diagram illustrating the relationship between the friction coefficient of the contact surfaces 21 a and 34 a of the electrode pads 21 and 34 with which the contact pin 11 comes into contact and the amount of sliding, according to the present embodiment.
The contact surfaces 21 a and 34 a of the board side electrode pad 21 and package side electrode pad 34 of FIG. 8 that come into contact with the contact pin 11 are roughened, as described in the above.
On the basis of the premise that the amount of sliding of the contact pin 11 is �1� when the friction coefficient of the contact surfaces 21 a and 34 a of the electrode pads 21 and 34 is �0.2� as illustrated in FIG. 11, the amount of sliding decreases to �approximately 0.9�, �approximately 0.8�, and �approximately 0.75� as the friction coefficients increase respectively to �0.3�, �0.4�, and �0.5�.
The amount of sliding of the contact pin 11 can effectively be reduced if the contact surfaces 21 a and 34 a of the electrode pads 21 and 34 are roughened, and more specifically, the amount of sliding can effectively reduced when the friction coefficient is 0.4 or higher. Apart from being roughened in the shape of a wave or the like, the contact surfaces 21 a and 34 a of the electrode pads 21 and 34 may be concavo-convex processed into a fine concavo-convex shape in order to reduce the amount of sliding of the contact pin 11.
Alternatively, the amount of sliding of the contact pin 11 may be reduced by processing the contact surfaces 21 a and 34 a of the electrode pads 21 and 34 into the shape of mortar, as illustrated in FIG. 12. In this case, the depth D of concave portions 21 a and 34 a of the board side electrode pad 21 and the package side electrode pad 34 is preferably equal to or more than the height of the electrode pads 21 and 34.
In the present embodiment described in the above, the rigidity of the board side bending part 11 f and the package side bending part 11 g of the contact pin 11 is selectively set to be high. Accordingly, the amount of bending can be reduced when pressure is applied to the contact pin 11, and thereby the amount of sliding of the contact pin 11 can be reduced. Therefore, according to the present embodiment, the security of the connection between the electrode pads 21 and 34 can be improved in the assembly of the electronic device 1.
Moreover, as the thickness of the bending parts 11 f and 11 g is increased by arranging the reinforcement parts 11 h and 11 i onto the bending parts 11 f and 11 g of the contact pin 11, the rigidity can be increased with a simple configuration, and thereby the security of the connection between the electrode pads 21 and 34 can be effectively improved.
Moreover, by making the thickness (t0) of the bending parts 11 f and 11 g become equal to or greater than 1.05 times the thickness (t1) of the base end 11 c and the arms 11 b and 11 d, as are the other parts continuous to the bending parts 11 f and 11 g, the amount of sliding of the contact pin 11 can be further reduced, and the security of the connection between the electrode pads 21 and 34 can be further improved.
Moreover, by making the Young's modulus of the material of the bending parts 11 f and 11 g themselves or the reinforcement parts 11 h and 11 i become higher than the Young's modulus of the material of the base end 11 c or the arms 11 b and 11 d, preferably by 1.2 times or even higher, the rigidity of the bending parts 11 f and 11 g can be increased, and thereby the security of the connection between the electrode pads 21 and 34 can be improved.
Moreover, by roughening or concavo-convex processing the contact surfaces 21 a and 34 a of the board side electrode pad 21 and the package side electrode pad 34 that come into contact with the contact pin 11, preferably by making the friction coefficient of the contact surfaces 21 a and 34 a become 0.4 or more, the amount of sliding of the contact pin 11 can be reduced further, and thereby the security of the connection between the electrode pads 21 and 34 can be improved.
Moreover, by processing the contact surfaces 21 a and 34 a of the electrode pads 21 and 34 into the shape of a mortar, the amount of sliding of the contact pin 11 can be further reduced, and thereby the security of the connection between the electrode pads 21 and 34 can be improved.
In the present embodiment, an example in which the reinforcement parts 11 h and 11 i are arranged only onto the board side bending part 11 f and the package side bending part 11 g is described, but the amount of sliding of the contact pin 11 may for example be reduced by configuring the reinforcement parts 11 h and 11 i to become a single member that extends between the board side bending part 11 f and the package side bending part 11 g. Even if there are plural bending parts 11 f and 11 g as in the contact pin 11 according to the present embodiment, the amount of sliding of the contact pin 11 may be reduced by arranging the reinforcement part onto at least one of the bending parts 11 f and 11 g. Moreover, the amount of sliding of the contact pin 11 may be reduced by making the contact pin 11 into such a shape that the thickness gradually increases from the side of the ends 11 a and 11 e to the bending parts 11 f and 11 g of the base end 11 c. Furthermore, in the present embodiment, the system board (wiring board) 20 and the IC package (electronic component) 30 are listed as examples of the first object and the second object, but the connector 10 may be used, for example, for connecting an electronic component and another electronic component or electrically connecting a wiring board and another wiring board.
The contact pin 11 (illustrated as a dot pattern in FIG. 15A) of the connector 10 is a thin metal plate in which are integrated a board side end 11 a forming a contact parallel to the system board 20, a board side arm 11 b functioning as a first arm extending straight towards the system board 20 with an inclination from a base end 11 c to a board side end 11 a, a base end 11 c extending in the direction perpendicular to the system board 20 and the IC package 30 and being sandwiched and held by the holding part 12, a package side arm 11 d functioning as a second arm extending straight towards the IC package 30 with an inclination from the base end 11 c to a board side end 11 e, and a package side end 11 e functioning as a free end forming a contact parallel to the IC package 30, all of which are as free ends projecting from the holding member 12 as a supporting member and the supporting plate 13, as illustrated in FIG. 6A, FIG. 6B, and FIG. 7 and described in the previous embodiment.
Moreover, as described in the previous embodiment, the rigidity of the bending parts 11 f and 11 g arranged on the base end 11 c are selectively set to be high, for example by arranging the reinforcement parts 11 h and 11 i thereonto. Furthermore, the board side arm 11 b and the package side arm 11 d have an inclination respectively against the system board 20 and the IC package 30.
In all of the contact pins 11 that the connector 10 according to the present embodiment has, the board side arms 11 b are all parallel to each other, and the package side arms 11 d are also all parallel to each other. Accordingly, the sliding direction S of all the contact pins 11 (ends 11 a, 11 e) are in the same direction parallel to each other (to the right, in FIG. 15A). As described in the previous embodiment, the amount of sliding of the contact pin 11 (ends 11 a, 11 e) in sliding direction S becomes small as the rigidity of the bending parts 11 f and 11 g in the contact pin 11 is set to be high. Moreover, the holding parts 12 of all the contact pins 11 move in the direction opposite to the sliding direction S of the contact pin 11.
In addition to the through holes 16 of the connector 10, three through holes 51, three through holes 21, and three insertion holes 31 a, as pin insertion holes, are formed on the bolster plate 50, the system board 20, and the package substrate 31, as illustrated in FIG. 13. The depth of the insertion holes 31 a of the package substrate 31 is up to a half the height of the package substrate 31.
The through holes 16, 21, 51 and the insertion holes 31 a, as pin insertion holes, are in communication with each other, and are formed across the system board 20, the connector 10, and the IC package 30, from the side of the bolster plate 50, and thereby the guide pins 71 are removable. As described in the above, in order to configure the guide pins 71 to become removable, the pin insertion holes need to be formed by penetrating at least one of the system board 20, the IC package 30, and the connector 10.
When pressure is applied to the contact pin 11, only the ends 11 a and 11 e of the contact pin 11 come into contact with another member such as the system board 20 or the IC package 30, in the connector 10.
Moreover, the sliding directions S of all the contact pins 11 (ends 11 a, 11 e) of the connector are the same, running parallel to each other (to the right, in FIG. 15A), and the amount of sliding in such direction S is small, as described in the above. On the other hand, all the holding parts 12 of the connector 10 move in the same direction (to the left, in FIG. 15A) parallel to each other, which is in the direction opposite to the sliding direction S. Accordingly, the supporting plate 13, the top flange 14, and the bottom flange 15 of FIG. 15A can move such that the amount of bending is absorbed when the contact pin 11 is pressurized.
In the present embodiment described in the above, the rigidity of the board side bending part 11 f and the package side bending part 11 g is selectively set to be high, in a similar manner as in the previous embodiment. Accordingly, the amount of bending can be decreased when the contact pin 11 is pressurized, and the amount of sliding of the contact pin 11 can be reduced. Therefore, according to the present embodiment, the security of the connection between the electrode pads 21 and 34 can be improved in the assembly of the electronic device 2.
Furthermore, according to the present embodiment, in the contact pins 11 that the connector 10 has, the board side arms 11 b are parallel to each other, and the package side arms 11 d are also parallel to each other. Accordingly, the sliding directions S of all the contact pins 11 are the same, running parallel to each other, and the supporting plate 13, the top flange 14, and the bottom flange 15 can be moved such that the amount of bending will be more effectively absorbed when the contact pin 11 is pressurized. Therefore, the security of the connection between the electrode pads 21 and 34 can be improved.
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