JP5333631B2 - Electronic component package mounting method using high-density electrode socket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure an electrical contact state of an electrode of an electronic component package and a needle-like contact of a high-density electrode socket, even when position aberration arises to the electrode of the electronic component package. <P>SOLUTION: An inner shape of an insertion recess 13 of an LGA socket 1 is formed rather larger so that a mounting position of an LGA 102 may be adjusted along an arrangement direction of a needle-like contact 2 of the LGA socket 1, and the mounting position of the LGA 102 is adjusted by package position adjusting screws 7, 8, 9 and 10 installed penetrating wall faces 3, 4, 5 and 6 of the insertion recess 13. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a mounting method for a high-density electrode socket used when an electronic component package such as a land grid array type LSI package with an integrated circuit is mounted on a wiring board.

  An integrated circuit such as a computer processor processes a large amount of information at high speed in a short time, and therefore the number of signal pins tends to increase. At the same time, the density increases and the signal pin pitch tends to decrease. For example, a land grid array type LSI package (hereinafter simply referred to as an LGA) incorporating an integrated circuit is known as an electronic component package with a higher density. The LGA is not a type that is soldered and mounted directly on the wiring board, but is mounted on the wiring board using a high-density electrode socket called an LGA socket or the like. The LGA socket is designed to allow the LGA to be easily detached from the wiring board. For the purpose of attaching the LGA to the inspection device used for the LGA inspection or for removing the replaceable computer card, Used by attaching to devices and computers.

  FIG. 11 shows an example of LGA mounting using a general LGA socket. The LGA socket 101 has a fitting recess 103 for detachably mounting the LGA 102, and the bottom surface 104 of the fitting recess 103 is individually in contact with each of the plurality of electrodes 105 arranged in close contact with one surface of the LGA 102. A plurality of needle-like contacts 106 are implanted. The needle-like contact 106 has a telescopic structure composed of a sleeve 107 and a needle 108, and each of the needles 108 is independently directed toward one surface of the LGA 102 in which a plurality of electrodes 105 are arranged by a spring (not shown) built in the sleeve 107. It is energized. Further, the board-side contact 109 of the LGA socket 101 protruding downward from the sleeve 107 penetrates the lower surface of the socket 101 and is exposed to the outside so as to come into contact with the electrode 111 on the wiring board 110 side. The wiring board 110 is provided with an inner layer wiring 112, and the electrode 111 is connected to the inner layer wiring 112.

  Since the positioning pin 113 is implanted on the lower surface of the LGA socket 101, the positioning of the LGA socket 101 with respect to the wiring board 110, that is, the electrode 111 by inserting the positioning pin 113 into the positioning hole 114 on the wiring board 110 side. The substrate-side contact 109 is accurately positioned with respect to the substrate.

  As a procedure for mounting the LGA 102 on the wiring board 110, first, the positioning pin 1113 of the LGA socket 101 is inserted into the positioning hole 114 of the wiring board 110, and the board-side contact 109 of the LGA socket 101 is placed on the electrode 111 of the wiring board 110. Then, the LGA socket 101 is fixed to the wiring board 110.

  Next, the LGA 102 is fitted into the fitting recess 103 of the LGA socket 101, and the LGA 102 is pressurized toward the bottom surface 104 of the fitting recess 103 with a package mounting load Q1 as shown in FIG. And the tip of the needle-like contact 106 of the LGA socket 101 are brought into contact with each other, and the electrode 111 of the wiring board 110 and the board-side contact 109 of the LGA socket 101 are brought into contact with each other. At this time, the LGA 102 is press-fitted into the fitting recess 103 by pressurizing the package mounting load Q1, and the LGA 102 is fixed to the LGA socket 101, and the positioning pins 113 of the LGA socket 101 are press-fitted into the positioning holes 114 of the wiring board 110. Thus, the LGA socket 101 is fixed to the wiring board 110.

  As described above, the needle 108 urged by the spring built in the sleeve 107 contacts the electrode 105, and the needle 108 sinks into the sleeve 107 against this urging force. As the LGA 102 is attached to the socket 101, the overlapping portion, that is, the contact area between the inner peripheral surface of the sleeve 107 and the outer peripheral surface of the needle 108 increases, and the needle 108 presses against the electrode 105 by the biasing force of the compressed spring. Therefore, the needle 108 and the electrode 105 can be reliably conducted.

  However, as the number of the electrodes 105 of the LGA 102 increases, the arrangement pitch of the electrodes 105 inevitably decreases, and at the same time, the area of the electrodes 105 decreases. Normally, relative displacement does not occur in the arrangement pitch of the electrodes 105 itself, but due to circumstances such as insufficient accuracy of processing of the LGA 102, the outer shape of the LGA 102 is used as an absolute reference for many electrodes 105 in the same direction. May be misaligned. In this case, in the LGA socket 101 that positions the LGA 102 with respect to the LGA socket 101 on the basis of the outer shape of the LGA 102, the positional deviation amount between the outer shape of the LGA 102 and the electrode 105 becomes a problem.

  FIG. 13 shows an example when the positional deviation between the LGA 102 and the electrode 105 of the LGA 102 is large. When the electrode 105 is displaced in the left-right direction with respect to the outer shape of the LGA 102 as shown in FIG. 13, the tip of the needle contact 106 and the electrode 105 of the LGA 102 are already aligned when the LGA 102 is fitted into the LGA socket 101. Even if the LGA 102 is pressurized with the package mounting load Q1 as shown in FIG. 14, normal conduction cannot be obtained. Usually, since the LGA 102 includes a large number of electrodes 105 in the vertical and horizontal directions on one surface, the same kind of problem can occur in the vertical direction (front-rear direction) in FIG.

  This problem is due to the positional relationship between the LGA 102 and the electrode 105 of the LGA 102, and although it can be solved by precisely processing the LGA 102 itself, the cost of the LGA 102 itself increases.

  Therefore, an LGA socket that can ensure conduction even when the outer shape of the LGA 102 and the position of the electrode 105 of the LGA 102 are shifted is desired.

  As a technique for ensuring the positioning accuracy between the electrodes, as disclosed in Patent Document 1, a plurality of positioning pins 116 provided on the electrode surface 115 of the LGA 102 are inserted into the holes 118 on the socket 117 side. What performs positioning is publicly known (refer to Drawing 15 (a) and Drawing 15 (b)). Although there is no problem as a structure for positioning, it is necessary to newly install positioning pins 116 on the electrode surface 115 of the LGA 102, which causes a cost increase.

  Further, as disclosed in Patent Document 2, a small camera 120 is embedded in an inspection socket 119, an external terminal of a semiconductor device 121 is imaged by the small camera 120, an image is recognized by an image recognition unit 122, and an output unit. It is proposed that the result is displayed in 123 and the semiconductor device 121 is moved to a desired position of the inspection socket 119 by operating the cross table 124 (see FIG. 16). Although this device can be expected to have high accuracy, it is necessary to provide a small camera 120 for each inspection socket 119, and this is an expensive inspection device. For this purpose, for example, a wiring board on which the semiconductor device 121 is mounted, etc. It is difficult to apply to.

JP 2003-78059 A JP 2006-23166 A JP 2002-164136 A Microfilm of Japanese Utility Model Application No. 02-084653 (Japanese Utility Model Publication No. 04-042087) Japanese Patent Laid-Open No. 06-188339 JP 2007-121222 A

  Therefore, an object of the present invention is to provide an electrode for an electronic component package and a high-density electrode even when a positional shift occurs in the electrode of the electronic component package with reference to the outer shape of the electronic component package such as an LGA. It is an object of the present invention to provide an electronic component package mounting method capable of smoothly positioning a socket with a needle-shaped contact to ensure an electrical contact state.

According to the electronic component package mounting method of the present invention, a plurality of needle-like contacts individually contacting each of a plurality of electrodes closely arranged on one surface of the electronic component package are attached in a rectangular shape for detachably mounting the electronic component package. From the bottom surface of the fitting recess, it is fixed to the bottom surface in a state of being independently urged and protruded toward the one surface of the electronic component package, and at least four corners of the bottom surface of the fitting recess Electrons using high-density electrode sockets that have needle-shaped contacts with three corners that have larger protrusions than other needle-shaped contacts and whose degeneracy at the tip is equivalent to other needle-shaped contacts A method for mounting a component package, in order to achieve the above-mentioned problem,
The electronic component package is placed in the fitting recess of the high-density electrode socket,
The electronic component package is placed on the bottom surface of the fitting recess by the force of the needle contact needles disposed at at least three corners among the four corners of the bottom surface of the fitting recess slightly sinking against the biasing force. In a state preloaded toward
While confirming the conduction state between the needle-shaped contacts provided at at least three of the four corners of the bottom surface of the fitting recess and the electrodes corresponding to the needle-shaped contacts, the electronic component package is removed from the needle. Move vertically and horizontally along the direction of the contact,
In the combination of the needle-like contact and the electrode that are the confirmation target of the conduction state, the movement of the electronic component package is stopped at the position where the conduction state is confirmed in all combinations,
Furthermore, the electronic component package is directed toward the bottom surface of the fitting recess, and all the needle-like contacts including the needle-like contacts having relatively short needles are brought into contact with the corresponding electrodes. In a pressurized state, the electronic component package is mounted in the fitting recess, and the mounting position is held.

  The mounting method of the electronic component package according to the present invention particularly corresponds to each of the needle-shaped contacts disposed at least three corners among the four corners of the bottom surface of the fitting recess of the high-density electrode socket and the needle-shaped contacts. The electronic component package is moved vertically and horizontally along the alignment direction of the needle-shaped contacts while confirming the conductive state with the electrodes to be confirmed, and all the conductive states between the needle-shaped contacts and the electrodes to be confirmed for the conductive state are confirmed. Since the electronic component package is mounted and held at a fixed position, the electronic component package electrode and the high-density electrode socket are securely prevented from being misaligned or misaligned with respect to the high-density electrode socket. An electrical contact state with the needle-shaped contact can be ensured.

  Moreover, the needle of the needle-like contact disposed at at least three of the four corners of the bottom surface of the fitting recess faces the electronic component package toward the bottom surface of the fitting recess by a force that slightly sinks against the biasing force. In this state, the electronic component package is moved vertically and horizontally along the direction of the needle contacts, and the frictional resistance generated between the tip of the needle and the lower surface of the electronic component package is slight. Since the electronic component package can be fed with a light force, there is no fear of damaging the lower surface of the electronic component package or the electrodes.

  Next, the best mode for carrying out the present invention will be specifically described with reference to some embodiments.

  FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of a high-density electrode socket (hereinafter simply referred to as an LGA socket) to which the present invention is applied.

  The LGA socket 1 includes a plurality of electrodes 105 that are closely arranged on one surface of an electronic component package 102 with a higher density, for example, a land grid array type LSI package (hereinafter simply referred to as an LGA 102) containing an integrated circuit. Are provided with a plurality of needle-like contacts 2 and a rectangular fitting recess 13 for detachably mounting the LGA 102.

  The needle-like contact 2 fixed to the bottom surface 104 of the fitting recess 13 has a telescopic structure composed of a sleeve 107 and a needle 108a or a sleeve 107 and a needle 108b. Each of the needles 108a and 108b is independently biased toward one surface, that is, the surface on which the electrode 105 is provided.

  Further, at least three corners of the four corners of the bottom surface 104 of the fitting recess 13 have a larger protruding amount than the needles 108b of the other needle-like contacts 2, and the degeneracy limit of the tip portion is other than that. The needle-shaped contact 2 having a needle 108a equivalent to the needle 108b of the needle-shaped contact 2 is provided. In particular, in this embodiment, the four convenient needle-like contacts 2 located at the four corners of the bottom surface 104 of the fitting recess 13 are provided with relatively long needles 108a.

The fitting recess 13 for mounting the LGA 102 is formed larger than the outer shape of the LGA 102 by at least a dimension comparable to the maximum displacement amount of the arrangement position of each electrode 105 with reference to the outer shape of the LGA 102.
For example, although the first electrode 105 is arranged at a distance A from the outer shape of the LGA 102 as shown in FIG. 1 in design, it is actually at a distance A ′ from the outer shape of the LGA 102. It is assumed that the first electrode 105 is disposed, and it is impossible that the first electrode 105 is disposed beyond the distance A ′ from the outer shape of the LGA 102 even if processing tolerances, errors, and other irregularities are taken into consideration. Then, the value of | A−A ′ | is the maximum displacement amount of the arrangement position of each electrode 105 with respect to the outer shape of the LGA 102, and at least the inner shape of the fitting recess 13 is larger than the outer shape of the LGA 102 | A −A ′ | Naturally, if there is a possibility of | A-A '| positional deviation before and after the design reference position, the maximum positional deviation amount is 2 · | A-A' |. Become.

  In the mold portion of the LGA socket 1 that surrounds the fitting recess 13, each wall surface 3, with each of the four wall surfaces 3, 4, 5, 6 surrounding the fitting recess 13 penetrating from the outside to the inside, is provided. , 4, 5, 6, package position adjusting screws 7, 8, 9, 10 are screwed and attached. 1 is a longitudinal sectional view, the illustration of the front wall surface 6 and the package position adjusting screw 10 is omitted. The lengths of the effective screw portions of the package position adjusting screws 7, 8, 9, and 10 are redundant, and the tips of the package position adjusting screws 7, 8, 9, and 10 can all come into contact with the outer shape of the LGA 102. Is possible.

  The mounting position adjusting means 11 for adjusting the mounting position of the LGA 102 along the direction in which the needle-shaped contacts 2 are arranged includes a fitting recess 13 that allows the LGA 102 to move in the vertical and horizontal directions at least within the range of the maximum displacement described above. The package position adjusting screws 7, 8, 9, 10 for each wall surface 3, 4, 5, 6 are configured. The vertical and horizontal movements referred to here are horizontal movements and vertical movements (front-rear directions) in FIG.

  Further, the mounting position fixing means 12 for holding the LGA 102 whose mounting position has been adjusted at the mounting position is composed of package position adjusting screws 7, 8, 9, and 10 that can be brought into contact with the outer shape of the LGA 102. Is done.

  As with the LGA socket 101 described with reference to FIGS. 11 to 14, the LGA socket 1 includes a board-side contact for contacting an electrode on the wiring board side to be mounted on the LGA socket 1 and the LGA socket 1. Although positioning pins and the like used for positioning when mounted on the wiring board are provided, since these components are known, description and explanation on the drawings are omitted.

  Next, a method for mounting the LGA 102 using the LGA socket 1 will be described.

  First, as a work in the setup stage, four needle-like contacts 2 provided at four corners of the bottom surface 104 of the fitting recess 13 of the LGA socket 1, that is, four needle-like shapes each having a relatively long needle 108a. A conduction detector 14 such as a tester is connected so that the conduction state between the contact 2 and the electrode 105 of the LGA 102 corresponding to each of the needle contacts 2 can be confirmed.

  In FIG. 1, the continuity detector 14 is illustrated as being directly connected to the needle-like contact 2 having a relatively long needle 108 a, but actually, the wiring (not shown) in which the LGA socket 1 is mounted. The continuity detector 14 can be connected via the inner layer wiring of the substrate. As a method for confirming continuity, a dedicated continuity wiring may be included in the LGA 102, or the continuity state may be confirmed by measuring input / output impedances of signal pins of the integrated circuit.

  Next, as shown in FIG. 1, the LGA 102 is placed in the fitting recess 13 of the LGA socket 1, and the four corners of the LGA 102 are supported by the needle-like contacts 2 arranged at the four corners of the fitting recess 13, The LGA 102 is preloaded toward the bottom surface 104 of the fitting recess 13 with a predetermined preload Q0. Assuming that the minimum force required to ensure electrical conduction between one needle-like contact 2 having a relatively long needle 108a and one electrode 105 of the LGA 102 is 0.5N. Then, the pre-pressure Q0 described above is four times that, that is, 2N.

  The needle 108a of the needle-like contact 2 disposed at the four corners of the fitting recess 13 at the stage of applying the preload Q0 slightly sinks against the biasing force of the spring, and the LGA 102 also moves downward. However, at this stage, the tip of the other needle-like contact 2, that is, the tip of the needle-like contact 2 having the relatively short needle 108 b does not come into contact with the LGA 102.

  Next, when looking at the continuity detector 14, four needle-like contacts 2 arranged at the four corners of the bottom surface 104 of the fitting recess 13 of the LGA socket 1, that is, four with relatively long needles 108a are provided. While confirming the conduction state between the needle-shaped contact 2 and the electrode 105 of the LGA 102 corresponding to each needle-shaped contact 2, the package position adjusting screws 7, 8, 9, 10 constituting the main part of the mounting position adjusting means 11 To move the LGA 102 in the vertical and horizontal directions along the direction in which the needle-shaped contacts 2 are arranged, that is, in the horizontal direction in FIG.

  Specifically, when the LGA 102 is moved in the left-right direction in FIG. 1, it corresponds to the set of the wall surfaces 3, 5 among the set of the wall surfaces 3, 5 and the wall surfaces 4, 6 facing each other in the fitting recess 13. The package position adjusting screws 7 and 9 are rotated to move the tips of the package position adjusting screws 7 and 9 synchronously in the same direction, for example, from right to left or from left to right. 1 is moved in the left-right direction in FIG.

  Further, when the LGA 102 is moved in the direction perpendicular to the paper surface (front-rear direction) in FIG. 1, the set of wall surfaces 4, 6 among the wall surfaces 3, 5 and wall surfaces 4, 6 facing each other in the fitting recess 13. By rotating the corresponding package position adjusting screws 8 and 10 and moving the tips of the package position adjusting screws 8 and 10 synchronously in the same direction, for example, from the front to the rear or from the rear to the front, the package position adjusting screws 8 and 10 The LGA 102 sandwiched between the ten tips is moved in the direction perpendicular to the plane of the drawing in FIG.

At this stage, since the four needle-like contacts 2 each abut only on the lower surface of the LGA 102 with a force of 0.5 N, the frictional resistance generated between the tip of the needle 108a and the lower surface of the LGA 102 is slight. The LGA 102 can be fed with a light force, and there is no fear of damaging the lower surface of the LGA 102 or the electrode 105.
If the lengths of the needles 108a of the needle-like contacts 2 provided at the four corners of the fitting recess 13 and the lengths of the needles 108b of the other needle-like contacts 2 are the same, all the needle-like contacts 2 are provided. If the total number of needle-like contacts 2 is 500, for example, a force of 250 N acts between the needle-like contacts 2 and the LGA 102 as a whole, and the LGA 102 In order to solve this problem, if the force acting on each needle-like contact 2 is reduced, the needle-like contact 2 and the LGA 102 side corresponding to each of the needle-like contacts 2 can be reduced. Even if the position of the electrode 105 completely matches, the conduction state becomes insufficient, and the needle-shaped control Caused an adverse effect such itself becomes difficult to check accurately by conducting the detector 14 that the positions of the electrode 105 of the transfected 2 suits.
In other words, in this embodiment, only the length of the needle 108a of the needle-like contact 2 disposed at the four corners of the fitting recess 13 is longer than that of the needle 108b of the other needle-like contact 2. The purpose is to facilitate the feeding and to detect the positioning of the electrode 105 with respect to the needle-like contact 2 with high accuracy.

  While the LGA 102 is repeatedly moved vertically and horizontally by the operation of the package position adjusting screws 7, 8, 9, and 10 by manual trial and error operation, the needle-like contact 2 and the electrode 105 that are to be confirmed for the conduction state are connected. The conduction state of all the combinations, that is, the convenience of the four needle-like contacts 2 arranged at the four corners of the bottom surface 104 of the fitting recess 13 and the electrode 105 on the LGA 102 side corresponding to each of them is the conduction detector 14. If confirmed, the operation of the package position adjusting screws 7, 8, 9, 10 is immediately stopped, and the movement of the LGA 102 is stopped.

  More preferably, the package position adjusting screws 7, 8, 9, and 10 are further operated in the state where conduction is confirmed in this way, so that the LGA 102 is oriented in the vertical and horizontal directions along the direction in which the needle-like contacts 2 are arranged, that is, FIG. 1 is moved slightly in the left-right direction and the vertical direction (front-rear direction) in FIG. 1, and the conduction detector 14 is monitored more carefully to find a position where the conduction state is optimum, and the movement of the LGA 102 is stopped at that position. Try to do the work.

  As a result of the above operation, as shown in FIG. 2, the four needle-like contacts 2 arranged at the four corners of the bottom surface 104 of the fitting recess 13 and the electrodes 105 on the LGA 102 side corresponding to the respective needle-like contacts 2 are reliably secured. And electrical continuity is ensured. In particular, when the final driving operation is performed, the center of the electrode 105 on the LGA 102 side can be strictly positioned at the tip position of the needle-like contact 2.

  Next, the LGA 102 is pressurized toward the bottom surface 104 of the fitting recess 13 with a predetermined package mounting load Q1 instead of the pre-load Q0 described above, and the LGA 102 is further submerged as shown in FIG. All the needle-like contacts 2 including the needle-like contacts 2 having the relatively short needles 108b are brought into contact with the electrodes 105 corresponding to the respective needle-like contacts 2. As described above, the force required to ensure electrical continuity between the needle-shaped contact 2 and one electrode 105 on the LGA 102 side is 0.5 N, and the total number of needle-shaped contacts 2 is 500. If so, the package mounting load Q1 is 500 times that, that is, 250N.

  Since the relatively long needle 108a of the needle-like contact 2 disposed at the four corners of the bottom surface 104 of the fitting recess 13 and the relatively short needle 108b of the other needle-like contact 2 have the same degeneracy limit. All the needle-like contacts 2 can be reliably brought into contact with the electrodes 105 corresponding to each of them.

  Next, the package position adjusting screws 7 and 9 are rotated in a direction in which the package position adjusting screws 7 and 9 of the wall surfaces 3 and 5 facing each other in the fitting recess 13 protrude toward the center of the fitting recess 13. The left and right sides of the LGA 102 are strongly held by the pressing force of the tips of the package position adjusting screws 7 and 9 that function as a part of the mounting position fixing means 12, and the package position adjusting screws 8 and 10 on the wall surfaces 4 and 6 are both held together. By rotating the package position adjusting screws 8 and 10 in the direction of projecting toward the center of the fitting recess 13, the pressing force at the tips of the package position adjusting screws 8 and 10 functioning as the other part of the mounting position fixing means 12 The LGA 102 is firmly held between the front and rear sides, and the LGA 102 is securely fixed to the fitting recess 13 of the LGA socket 1, and the package is secured after the LGA 102 is secured. Removing di mounting load Q1.

  Since the LGA 102 is securely fixed by the package position adjusting screws 7, 8, 9, 10 that function as the mounting position fixing means 12, there is no fear that the LGA 102 will be lifted even if the package mounting load Q 1 is removed. It is securely attached.

  FIG. 4 shows package position adjusting screws 7 and 9 and package positions for each of the wall surfaces 3, 5, and 6 facing each other in the four wall surfaces 3, 4, 5, 6 surrounding the fitting recess 13. This is an embodiment in which adjustment screw rotation driving means for rotating the package position adjustment screws 7 and 9 and the package position adjustment screws 8 and 10 so that the adjustment screws 8 and 10 move in the same direction is provided.

  In the example of FIG. 4, the adjusting screw rotation drive means 15 for lateral feed corresponding to the set of wall surfaces 3 and 5 is constituted by motors M1 and M2 attached to the left and right sides of the LGA socket 1 ′. The adjusting screw rotation driving means 16 for vertical feed corresponding to the six groups is constituted by motors M3 and M4 attached to the front and rear sides of the LGA socket 1 ′. Other configurations are the same as those of the first embodiment described with reference to FIGS. 4 is a longitudinal sectional view, the illustration of the front wall surface 6, the package position adjusting screw 10, and the motor M4 is omitted.

  When the LGA 102 is moved in the left-right direction in FIG. 4, the package position adjustment corresponding to the set of the wall surfaces 3, 5 among the wall surfaces 3, 5 and the wall surfaces 4, 6 facing each other in the fitting recess 13 is performed. By rotating the motors M1 and M2 that rotationally drive the screws 7 and 9 and moving the tips of the package position adjusting screws 7 and 9 synchronously in the same direction, for example, from right to left or from left to right, the package position is adjusted. The LGA 102 sandwiched between the tips of the screws 7 and 9 is moved in the left-right direction in FIG. The moving speed of the package position adjusting screws 7 and 9 in the left-right direction is determined by the product of the screw lead and the motor rotation speed, and the moving direction of each screw is the engraving direction of the screw (normal screw / reverse screw). ) And the rotational direction of the motor, the synchronous meaning here does not mean that the rotational speed and rotational direction of the motor coincide with each other. And the movement speed.

  When the LGA 102 is moved in the direction perpendicular to the paper surface (front-rear direction) in FIG. 4, the set of wall surfaces 4 and 6 among the wall surfaces 3 and 5 and the wall surfaces 4 and 6 facing each other in the fitting recess 13. Rotate the motors M3 and M4 that rotationally drive the package position adjusting screws 8 and 10 corresponding to 1 to move the tips of the package position adjusting screws 8 and 10 in the same direction, for example, from the front to the rear or from the rear to the front. As a result, the LGA 102 sandwiched between the tips of the package position adjusting screws 8 and 10 is moved in the direction perpendicular to the paper surface (front-rear direction) in FIG. The meaning of synchronization is the same as described above.

  The positioning and mounting method of the LGA 102 using the LGA socket 1 ′ is the same as in the case of the first embodiment described above. Finally, when the LGA 102 is fixed to the fitting recess 13 of the LGA socket 1 ′, the fitting is performed. The mounting position fixing means is configured to simultaneously drive the motors M1 and M2 so that the package position adjusting screws 7 and 9 of the wall surfaces 3 and 5 facing each other in the mating recess 13 protrude toward the center of the fitting recess 13. 12, the left and right sides of the LGA 102 are strongly held by the pressing force of the tip of the package position adjusting screws 7 and 9 that function as a part of the package 12, and the package position adjusting screws 8 and 10 of the wall surfaces 4 and 6 are The tips of the package position adjusting screws 8 and 10 functioning as other parts of the mounting position fixing means 12 by simultaneously rotating and driving the motors M3 and M4 so as to protrude toward the center. The front and rear sides of the pressing force LGA102 strongly by pinching, to ensure that secure the LGA102 into the mating recess 13 of the LGA socket 1 '.

  In the structure of the LGA socket 1 of the first embodiment shown in FIG. 1 and the structure of the LGA socket 1 ′ of the second embodiment shown in FIG. 4, the mounting position adjusting means for adjusting the position and fixing of the LGA 102 and the mounting position fixing Since parts such as package position adjusting screws 7, 8, 9, 10 that function as means are provided on the LGA sockets 1, 1 'side, a considerable space is secured on the wiring board on which the LGA sockets 1, 1' are mounted. Therefore, the structure of the LGA sockets 1 and 1 'is also relatively complicated. These configurations do not pose a problem in the LGA sockets 1 and 1 ′ mounted on the LGA 102 dedicated inspection apparatus, but the wiring board itself on which the LGA sockets 1 and 1 ′ are mounted becomes a product or a part of the product. In this case, for example, when the LGA 102 functioning as a computer card is mounted on a wiring board of a computer and the wiring board or computer is shipped as a product, the wiring board or the computer may be increased in size or production cost may be increased. There is sex.

  Therefore, an embodiment of the LGA socket which further simplifies the configuration of the LGA socket to reduce the number of parts, enables the mounting of the LGA socket in a narrower space, and reduces the production cost, and this An embodiment of an LGA socket mounting method and an electronic component package position adjusting unit for automating the mounting of the LGA socket will be described.

  FIG. 5A shows an LGA socket 1 "in which a package position adjusting screw is omitted and an electronic component package position adjusting unit 17 (hereinafter simply referred to as a position adjusting unit 17) for mounting the LGA 102 in the LGA socket 1". It is the longitudinal cross-sectional view shown about the principal part.

  The LGA socket 1 ″ is configured by a base member 18 that forms a bottom surface 104 of a rectangular fitting recess 13 for detachably mounting the LGA 102, and a movable frame 19 that surrounds the fitting recess 13. A plurality of needle-like contacts 2 that are individually in contact with each of the plurality of electrodes 105 disposed in close contact with one surface of the LGA 102 are fixed to the base member 18 that constitutes the base member 18.

  The needle-like contact 2 has a telescopic structure composed of the sleeve 107 and the needle 108a or the sleeve 107 and the needle 108b, as in the first and second embodiments, and is provided with a spring (not shown) built in the sleeve 107. Each of the needles 108a and 108b is independently biased toward one surface of the LGA 102, that is, the surface on which the electrode 105 is provided.

  Further, at least three corners of the four corners of the bottom surface 104 of the fitting recess 13 have a larger protruding amount than the needles 108b of the other needle-like contacts 2, and the degeneracy limit of the tip portion is other than that. The needle-shaped contact 2 having a needle 108a equivalent to the needle 108b of the needle-shaped contact 2 is provided. In particular, in this embodiment, the four convenient needle-like contacts 2 located at the four corners of the bottom surface 104 of the fitting recess 13 are provided with relatively long needles 108a.

  The inner periphery of the movable frame 19 is formed in accordance with the outer shape of the LGA 102, and the LGA 102 is press-fitted with an interference fit and attached to the movable frame 19.

Further, the movable frame 19 cannot be brought into and out of contact with the base member 18, and at least along the surface of the base member 18 by a distance equivalent to the maximum displacement amount of the arrangement position of each electrode 105 with reference to the outer shape of the LGA 102. It can be moved vertically and horizontally.
For example, although the first electrode 105 is arranged at a distance A from the outer shape of the LGA 102 in the design as shown in FIG. The first electrode 105 is disposed at a distance of A ′, and even if processing tolerances, errors, and other irregularities are taken into consideration, the first electrode 105 may be disposed beyond the distance A ′ from the outer shape of the LGA 102. If not, the value of | A−A ′ | is the maximum displacement amount of the arrangement position of each electrode 105 with respect to the outer shape of the LGA 102, and at least the movable frame 19 extends along the base member 18 with | A −A ′ | needs to be movable vertically and horizontally by an equivalent distance. If there is a possibility of | A-A '| positional deviation before and after the design reference position, the maximum positional deviation amount is 2 · | A-A' |.

  Since the maximum displacement amount is not a large value, for example, as shown in FIG. 5A, a protrusion 20 having a diameter-enlarged portion at the tip is formed on the lower surface side of the movable frame 19, and this protrusion 20 is used as the base member 18. The movable frame 19 is allowed to move vertically and horizontally by using play between the reduced diameter portion of the stepped hole 21 and the reduced diameter portion of the protrusion 20 and the diameter of the protrusion 20 is increased. The movable frame 19 is moved within the range of the maximum misalignment amount by making the movable frame 19 inaccessible to and away from the base member 18 by utilizing interference between the portion and the reduced diameter portion of the stepped hole 21. Is possible.

  On the other hand, as shown in FIG. 5A, the main part on the hardware of the position adjustment unit 17 is the LGA 102 placed in the fitting recess 13 of the LGA socket 1 ″ on the bottom surface 104 of the fitting recess 13. The pusher arm 22 functions as a pressing unit that presses toward the surface, and a movable frame feeding unit 23 that moves the movable frame 19 vertically and horizontally along the surface of the base member 18.

  As shown in FIG. 5A, the movable frame feeding means 23 includes movable frame feeding means 24 and 25 for lateral feeding located on the left and right sides of the movable frame 19, and movable for vertical feeding located before and after the movable frame 19. The frame feed means 26 and 27 are comprised. Since FIG. 5A is a longitudinal sectional view, the vertical feed movable frame feeding means 27 is omitted from the drawing.

  FIG. 5B is a cross-sectional view of the lateral feed movable frame feeding means 25 as seen from the direction of arrows AA in FIG. As shown in FIG. 5B, the lateral feed movable frame feed means 25 includes a stay 28 fixed to a lifting head (not shown) and protruding downward, and a lower end portion of the stay 28 using spline fitting. On the outer periphery of the socket 30, and a feed screw 29 that is attached to the stay 28 so as to be rotatable and non-movable in the axial direction. It is constituted by a timing belt 31 that is wound around, and the feed screw 29 is moved in the left-right direction in FIG.

  The horizontal feed movable frame feed means 24 and the vertical feed movable frame feed means 26 and the vertical feed movable frame feed means 27 (not shown) also have the same configuration as the above-described horizontal feed movable frame feed means 25.

  Among them, the timing belt 31 of the transverse feed movable frame feed means 25 and the timing belt 32 of the transverse feed movable frame feed means 24 are synchronously driven by a transverse feed servomotor Mx fixed to a lifting head (not shown). The feed screw 29 screwed into the socket 30 of the lateral feed movable frame feed means 25 and the feed screw 34 screwed into the socket 33 of the horizontal feed movable frame feed means 24 are in the same direction, for example, from right to left. Alternatively, the LGA 102 is moved from left to right at the same time, and the LGA 102 sandwiched between the tips of the feed screws 29 and 34 is moved in the left-right direction in FIG.

  Similarly, the timing belt 35 of the vertical feed movable frame feed means 26 and the timing belt 36 of the vertical feed movable frame feed means 27 are synchronized with each other by a vertical feed servomotor My fixed to a lifting head (not shown). The feed screw 37 screwed into the socket of the vertical feed movable frame feed means 26 and the feed screw 38 screwed into the socket of the vertical feed movable frame feed means 27 are rotated in the same direction, for example, from the front. The LGA 102 is moved from the rear or the rear to the front at the same time, and the LGA 102 sandwiched between the tips of the feed screws 37 and 38 is moved in the direction perpendicular to the paper surface (front-rear direction) in FIG. 5A is a longitudinal sectional view, the vertical feed movable frame feed means 27, the feed screw 38 and the timing belt 36 on the near side are not shown in the drawing.

  The pusher arm 22 is driven in the vertical direction in FIG. 5A by linear drive means (not shown) such as a ball nut and screw. The press servo motor Mp, which is a drive source for linear drive means such as ball nuts and screws, is also housed in a lift head (not shown) together with the above-described servo motor Mx and longitudinal feed servo motor My. The head itself is attached to a column (not shown) of the position adjusting unit 17 so as to be movable up and down, and is movable for lateral feed constituting the movable frame feed means 23 by linear drive means such as a rack & pinion or a ball nut & screw. Along with the frame feed means 24 and 25, the vertical feed movable frame feed means 26 and 27, and the pusher arm 22, it is driven up and down in the vertical direction in FIG. A lifting servomotor Mz of linear drive means for moving the lifting head up and down is housed in the column of the position adjustment unit 17.

  FIG. 6 is a block diagram showing an outline of the configuration of the control unit 38 of the position adjustment unit 17.

  The main part of the control unit 38 includes a microprocessor 39, a ROM 40 storing the control program, a RAM 41 used for temporary storage of calculation data, and a non-volatile memory 42 storing various parameters. The input / output circuit 43 of the microprocessor 39 is connected to a manual operation panel 44 for inputting a start signal for operating the position adjusting unit 17 and a display 45 for displaying various measurement data. Yes.

  A transverse feed servo motor Mx for driving the transverse feed movable frame feed means 24, 25 constituting a part of the movable frame feed means 23, and a longitudinal feed movable frame feed means constituting the other part of the movable frame feed means 23. The vertical feed servo motor My that drives the motors 26 and 27, the lift servo motor Mz that moves the lift head (not shown) up and down, and the press servo motor Mp that drives the pusher arm 22 are connected to the input / output circuit 43 and each of them. The drive is controlled by the microprocessor 39 through drivers 46, 47, 48, and 49.

  Among these, the lateral feed servo motor Mx, the vertical feed servo motor My, and the lift servo motor Mz are provided with pulse coders Px, Py, and Pz for detecting the absolute position of each axis in the machine coordinate system of the position adjustment unit 17. Then, based on the feedback signals from the pulse coders Px, Py, Pz, the microprocessor 39 can recognize the current position of each axis. Further, the microprocessor 39 detects the drive current of the press servomotor Mp via the driver 49 of the press servomotor Mp, and based on this drive current, the reaction torque acting on the press servomotor Mp, finally For this, the force with which the tip of the pusher arm 22 presses the LGA 102 is obtained.

  As in the case of the first embodiment shown in FIG. 1, four needle-like contacts 2 arranged at the four corners of the bottom surface 104 of the fitting recess 13 of the LGA socket 1 ″, that is, a relatively long needle The needles 14 provided at the four corners are provided with the conduction detectors 14 for confirming the conduction state between the four needle-like contacts 2 provided with 108a and the electrode 105 of the LGA 102 corresponding to each of the needle-like contacts 2. Signals T1, T2, T3, T4 representing the conductive state between the electrode-like contact 2 and the electrode 105 of the LGA 102 corresponding to each of the needle-like contacts 2 are converted into A / D converters 50, 51, 52, 53 and an input / output circuit. 43 is read from the continuity detector 14 into the microprocessor 39. In this embodiment, T1, T , T3, T4 is the voltage signal output in response to the conduction state, the conductive state also increases the value of the output voltage as optimizing.

  7 and 8 are flowcharts showing an outline of processing executed by the microprocessor 39 of the control unit 38 provided in the position adjustment unit 17.

  Next, referring to the flowcharts of FIGS. 7 and 8, the processing operation of the microprocessor 39 functioning as preload control means, first position component specifying means, second position component specifying means, movable frame positioning means, and press fit control means, A method of mounting the LGA 102 using the LGA socket 1 ″ will be specifically described.

  It is assumed that the lifting head of the position adjusting unit 17 is in the retracted position above the LGA socket 1 "in the initial state, and the wiring board on which the LGA socket 1" has already been mounted is adjusted by the setup work before starting the mounting work. It is assumed that the LGA 102 to be mounted and clamped on the table of the unit 17 is placed in the fitting recess 13 of the LGA socket 1 ″.

  Next, when the user operates the manual operation panel 44 to input an activation signal to the control unit 38 of the position adjustment unit 17, the microprocessor 39 that has detected the input of the activation signal first drives the lifting servo motor Mz. The lifting head of the position adjustment unit 17 is lowered, and the tips of the feed screws 29, 34, 37, 38 are positioned on the outer periphery of the movable frame 19 of the LGA socket 1 "in the state shown in FIG. 5A (step s1). ).

  Next, the microprocessor 39 drives the vertical feed servo motor My to rotate the feed screws 37 and 38 synchronously, and positions the movable frame 19 at the initial position in the vertical direction (front-rear direction) in FIG. 5A. (Step s2).

  This initial position is determined by moving the movable frame 19 from the design reference position in the direction perpendicular to the paper surface in FIG. 5A (corresponding to the maximum amount of displacement of the arrangement position of each electrode 105 with respect to the outer shape of the LGA 102 ( The position is moved to the front side in the front-rear direction. Therefore, in the correspondence relationship between the needle-like contact 2 of the LGA socket 1 ″ and the electrode 105 on the LGA 102 side corresponding to the needle-like contact 2, the electrode 105 is more perpendicular to the plane of the drawing in FIG. Although the possibility of being positioned on the near side in the (front-rear direction) is large, the electrode 105 is positioned behind the needle-shaped contact 2 in the vertical direction (front-rear direction) in FIG. 5A. There is no possibility.

  Next, the microprocessor 39 functioning as the preload control means drives the press servomotor Mp, lowers the pusher arm 22 functioning as the press means, as shown in FIG. The LGA 102 is preloaded toward the bottom surface 104 of the fitting recess 13 with the pressure Q0 (step s3).

  Specifically, the microprocessor 39 outputs a movement command to the press servomotor Mp while detecting the drive current, that is, the reaction torque value of the press servomotor Mp, and presses the LGA 102 at the tip of the pusher arm 22 to drive. When the current, that is, the reaction torque value reaches a value corresponding to the pre-pressure Q0, the output of the movement command to the press servomotor Mp is stopped. Since the driver 49 is substantially a servo circuit, the preload Q0 is held as it is due to an error value (deviation between the target position and the actual position) in the servo circuit.

  At the stage of applying the pre-pressure Q0, the needle 108a of the needle-like contact 2 disposed at the four corners of the fitting recess 13 sinks slightly against the biasing force of the spring, and the LGA 102 also moves downward. However, at this stage, the tip of another needle-like contact 2, that is, the tip of the needle-like contact 2 having a relatively short needle 108 b does not come into contact with the LGA 102. If the force required to ensure electrical continuity between the needle-like contact 2 and one electrode 105 on the LGA 102 side is 0.5 N following the example of the first embodiment, the pre-pressure Q0 is Four times, that is, about 2N.

  Next, the microprocessor 39 resets the contact state confirmation flag F (step s4), initializes the maximum value storage register Vmax to 0 (step s5), and initializes the value of the retry counter C to 0 (step s4). s6), the transverse feed servo motor Mx is driven to rotate the feed screws 29 and 34 of the transverse feed movable frame feed means 24 and 25 synchronously, thereby positioning the movable frame 19 at the initial position in the horizontal direction in FIG. (Step s7).

  At this stage, the four needle-like contacts 2 only abut against the lower surface of the LGA 102, so the frictional resistance generated between the tip of the needle 108a and the lower surface of the LGA 102 is slight, and the LGA 102 is fed with a light force. There is no worry of damaging the lower surface of the LGA 102 or the electrode 105.

  As described above, this initial position moves the movable frame 19 from the design reference position to the left side in FIG. 9 by an amount corresponding to the maximum displacement amount of the arrangement position of each electrode 105 with respect to the outer shape of the LGA 102. This is the position Therefore, in the correspondence relationship between the needle-like contact 2 of the LGA socket 1 ″ and the electrode 105 on the LGA 102 side corresponding to the needle-like contact 2, the electrode 105 may be located on the left side in FIG. However, there is no possibility that the electrode 105 is positioned on the right side in FIG. 9 beyond the position of the needle-like contact 2.

  Next, the microprocessor 39 functioning as the first position component specifying means drives the lateral feed servo motor Mx to rotate the feed screws 29 and 34 synchronously, and the movable frame 19 is needle-shaped along the surface of the base member 18. The contacts 2 are moved by a minute amount, for example, by one pulse of the transverse feed servo motor Mx, toward the right direction in FIG. 9, which is the first arrangement direction of the contacts 2 (step s8), and are moved to the four corners of the LGA socket 1 ″. Signals T1, T2, T3, T4 representing the conduction state between the deployed needle-like contact 2 and the electrode 105 of the LGA 102 corresponding to each of the needle-like contacts 2 are read from the conduction detector 14 (step s9). Whether or not all the values exceed the threshold value V0, in short, the needle-like contact 2 provided at the four corners and the knee All combinations of the electrodes 105 of LGA102 corresponding to each of the Le-shaped contact 2 determines whether a conduction state at the same time (step s10).

  If all four combinations of the needle-like contact 2 and the electrode 105 are not in the conductive state at the same time, the microprocessor 39 further determines whether or not the contact state confirmation flag F is set (step s16). At this stage, since the contact state confirmation flag F is held in the reset state, the microprocessor 39 further determines that the current position of the feed screws 29 and 34, that is, the current position of the movable frame 19 in the horizontal direction in FIG. It is determined whether or not the end has been reached (step s17).

  The stroke end referred to here is a distance corresponding to the maximum amount of displacement of the arrangement position of each electrode 105 with reference to the outer shape of the LGA 102.

  If the current position of the feed screws 29 and 34, that is, the current position of the movable frame 19 in the left-right direction in FIG. 9 has not reached the stroke end, the microprocessor 39 functioning as the first position component specifying means performs the same steps as described above. The processes of s8 to step s10 and steps s16 to s17 are repeatedly executed.

  If the determination result in step s17 becomes true during this period, even if the movable frame 19 is moved from the initial position in the left-right direction to the stroke end, the needle-shaped contact 2 arranged at the four corners and the needle-shaped contact The combination of the electrodes 105 of the LGA 102 corresponding to each of 2 does not become conductive at the same time, that is, the electrode 105 of the LGA 102 is shifted to the near side in the vertical direction (front-rear direction) in FIG. Means that

  Accordingly, in this case, the microprocessor 39 increments the value of the retry counter C by 1 (step s18), and determines whether or not the current value of the retry counter C exceeds the allowable value n (step s19).

  If the value of the retry counter C does not exceed the allowable value n, the microprocessor 39 drives the vertical feed servo motor My to synchronously rotate the feed screws 37, 38 of the vertical feed movable frame feed means 26, 27. Then, the movable frame 19 is moved rearward in the vertical direction (front-rear direction) in FIG. 9 by a predetermined offset amount smaller than the maximum positional deviation amount (step s20), and the transverse feed servo motor Mx is driven again. Then, the feed screws 29 and 34 of the lateral feed movable frame feed means 24 and 25 are synchronously rotated to position the movable frame 19 at the initial position in the left-right direction in FIG. 9 (step s7). Steps s8 to s10 and steps s16 to s17 are repeatedly executed as a retry operation.

  As the value of the allowable value n, a value obtained by rounding up a numerical value obtained by dividing the maximum positional deviation amount by the predetermined offset amount described in step s20 is appropriate.

  Although this retry operation is allowed up to n times, the needle-like contact 2 disposed at the four corners and the electrodes of the LGA 102 corresponding to each of the needle-like contacts 2 even if the retry operation is repeatedly executed n times. If the combination of 105 does not become conductive at the same time, the movable frame 19 is repeatedly moved left and right from the initial position on the left side in the left-right direction in FIG. Even if the movable frame 19 is fed in the vertical direction toward the rear in the vertical direction of the paper from the initial position in the vertical direction (front-back direction) in FIG. That is, it is not possible to obtain a conduction state even if the LGA 102 is moved in the vertical and horizontal directions within the range of the maximum displacement. Taste. In this case, since there is a high possibility that there is an abnormality in the LGA socket 1 ″ or the LGA 102 itself, the microprocessor 39 displays an error message on the display unit 45 and abandons the continuation of processing related to the mounting of the LGA 102.

  On the other hand, the combination of the needle-like contact 2 disposed at the four corners and the electrode 105 of the LGA 102 corresponding to each of the needle-like contact 2 during the repeated execution of the processes of steps s8 to s10 and steps s16 to s17. When it is confirmed that all are in the conductive state at the same time and the determination result in step s10 is true, the microprocessor 39 functioning as the first position component specifying means sets the contact state confirmation flag F. (Step s11), and the addition value of the signals T1, T2, T3, T4 from the continuity detector 14 read in the immediately preceding step s9, that is, four values are stored. Each of the needle-shaped contact 2 disposed in the corner and the needle-shaped contact 2 Determined the overall conduction state between the response to LGA102, determines whether the added value is greater than the current value of the maximum value storage register Vmax (step s12).

  Only when the added value exceeds the current value of the maximum value storage register Vmax, the microprocessor 39 functioning as the first position component specifying means updates the added value to the maximum value storage register Vmax and stores it. (Step s13).

  Further, the microprocessor 39 functioning as the first position component specifying means detects the left and right in FIG. 9 from the pulse coder Px of the lateral feed servomotor Mx only when the added value exceeds the current value of the maximum value storage register Vmax. The current position of the feed screws 29, 34 in the direction, that is, the current position of the movable frame 19 in the left-right direction is read (step s14), and this value is updated and stored in the optimum lateral position storage register Rx (step s15). Move on to processing.

  On the other hand, when the added value of the signals T1, T2, T3, and T4 from the continuity detector 14 does not exceed the current value of the maximum value storage register Vmax and the determination result in step s12 is false, the microprocessor 39 Skips steps s13 to s15 and proceeds to step s8 again.

  In this way, it is confirmed that all of the combinations of the needle-like contact 2 provided at the four corners and the electrode 105 of the LGA 102 corresponding to each of the needle-like contact 2 are in the conductive state at the same time. Once F is set, as long as the continuous conduction state is continuously confirmed in all the combinations of the needle-like contact 2 arranged at the four corners and the electrode 105 of the LGA 102 corresponding to each of the needle-like contact 2, that is, As long as the determination result of step s10 continues to be true, the processing of step s8 to step s12 or step s8 to step s15 is repeatedly executed by the microprocessor 39 functioning as the first position component specifying means.

  That is, the right end of the electrode 105 of the LGA 102 shown in FIG. 9 approaches the needle-like contact 2 from the left side in FIG. 9 and comes into actual contact, and then the left end of the electrode 105 of the LGA 102 is on the right side of the needle-like contact 2. Until the process exits, the process of step s8 to step s12 or step s8 to step s15 is repeatedly executed. In the moving section of the LGA 102, the conduction state between the electrode 105 of the LGA 102 and the needle-like contact 2 is optimized at the moment when the central portion in the left-right direction of the electrode 105 contacts the tip of the needle-like contact 2. Finally, the added value of T1, T2, T3, and T4 at this time is held as the maximum value in the maximum value storage register Vmax, and similarly, the central portion in the left-right direction of the electrode 105 is in a needle shape. The current position Px of the movable frame 19 at the moment of contact with the tip of the contact 2 is held in the optimum lateral position storage register Rx as it is.

  When the left end portion of the electrode 105 of the LGA 102 is completely removed to the right side of the needle-like contact 2, the conduction state between the needle-like contact 2 and the electrode 105 corresponding to the needle-like contact 2 is not guaranteed, and the determination in step s10 is performed. The result is false.

  Next, the microprocessor 39 determines whether or not the contact state confirmation flag F is set (step s16). Since the contact state confirmation flag F is already set at this stage, the determination result in step s16 is The microprocessor 39, which is true and functions as a part of the movable frame positioning means, drives the lateral feed servo motor Mx to synchronously rotate the feed screws 29 and 34 of the lateral feed movable frame feed means 24 and 25 so that the movable frame positioning means is movable. The frame 19 is moved in the left-right direction in FIG. 9, and the position specified by the first position component specifying means, that is, the position indicated by the optimum lateral position storage register Rx, and the center portion in the left-right direction of the electrode 105 is a needle shape. The movable frame 19 and the LGA 102 are positioned at a position in contact with the tip of the contact 2 (step s21).

  Next, the microprocessor 39 resets the maximum value storage register Vmax to 0 again (step s22), drives the vertical feed servo motor My, and sets the feed screws 37, 38 of the vertical feed movable frame feed means 26, 27. By rotating synchronously, the movable frame 19 is positioned again at the initial position in the vertical direction (front-rear direction) in FIG. 9 (step s23). The initial position is determined by moving the movable frame 19 from the design reference position by the amount corresponding to the maximum displacement amount of the arrangement position of each electrode 105 with respect to the outer shape of the LGA 102 as shown in FIG. It is the position moved to the near side.

  Next, the microprocessor 39 functioning as the second position component specifying means drives the vertical feed servo motor My to synchronously rotate the feed screws 37 and 38 of the vertical feed movable frame feed means 26 and 27, thereby moving the movable frame 19. 9 along the surface of the base member 18 toward the rear in the vertical direction (front-rear direction) in FIG. 9, which is the second alignment direction of the needle-like contacts 2, for example, equivalent to one pulse of the servo motor My for longitudinal feed (Step s24), and signals T1 and T2 representing the conduction state between the needle-like contact 2 provided at the four corners of the LGA socket 1 "and the electrode 105 of the LGA 102 corresponding to each of the needle-like contact 2. , T3, T4 are read from the continuity detector 14 (step s25), and it is required whether or not all of these values exceed the threshold value V0. Determines whether all combinations of the four needle-shaped contacts are deployed on the corner 2 and the needle-shaped contacts 2 each corresponding to LGA102 electrode 105 is in a conductive state simultaneously (step s26).

  If all of the four combinations of the needle-like contact 2 and the electrode 105 are not in the conductive state at the same time, the microprocessor 39 further performs the current position of the feed screws 37 and 38, that is, the vertical direction (front-rear direction) in FIG. It is determined whether or not the current position of the movable frame 19 has reached the stroke end (step s31).

  The stroke end referred to here is a distance corresponding to the maximum amount of displacement of the arrangement position of each electrode 105 with reference to the outer shape of the LGA 102.

  If the current position of the feed screws 37, 38, that is, the current position of the movable frame 19 in the vertical direction (front-rear direction) in FIG. 9 does not reach the stroke end, the microprocessor 39 functioning as second position component specifying means In the same manner as described above, the processes of steps s24 to s26 and step s31 are repeatedly executed.

  All the combinations of the needle-like contact 2 provided at the four corners and the electrode 105 of the LGA 102 corresponding to each of the needle-like contact 2 are simultaneously performed while the processes of steps s24 to s26 and step s31 are repeatedly executed. When it is confirmed that the continuity state is established and the determination result in step s26 becomes true, the microprocessor 39 functioning as the second position component specifying means reads from the continuity detector 14 read in the immediately preceding step s25. An added value of the signals T1, T2, T3, T4, that is, an overall conduction state between the needle-like contact 2 disposed at the four corners and the LGA 102 corresponding to each of the needle-like contact 2, is obtained. Whether or not exceeds the current value of the maximum value storage register Vmax That (step s27).

  Only when the added value exceeds the current value of the maximum value storage register Vmax, the microprocessor 39 functioning as the second position component specifying means updates the added value to the maximum value storage register Vmax and stores it. (Step s28).

  Further, the microprocessor 39 functioning as the second position component specifying means does not use the pulse coder Py of the vertical feed servomotor My from the page of FIG. 9 only when the added value exceeds the current value of the maximum value storage register Vmax. The current position of the feed screws 37, 38 in the vertical direction (front-rear direction), that is, the current position of the movable frame 19 in the front-rear direction is read (step s29), and this value is updated and stored in the optimum lateral position storage register Ry (step s30). ), The process proceeds to step s24.

  On the other hand, if the addition value of the signals T1, T2, T3, T4 from the continuity detector 14 does not exceed the current value of the maximum value storage register Vmax and the determination result in step s27 is false, the microprocessor 39 Skips steps s28 to s30 and proceeds to step s24 again.

  When it is once confirmed that all the combinations of the needle-like contacts 2 arranged in the four corners and the electrodes 105 of the LGA 102 corresponding to the needle-like contacts 2 are in the conductive state at the same time, As long as the continuous conduction state is continuously confirmed in all the combinations of the needle-like contact 2 provided at one corner and the electrode 105 of the LGA 102 corresponding to each of the needle-like contact 2, that is, the determination result of step s26 is true. As far as possible, the processing of step s24 to step s27 or step s24 to step s30 is repeatedly executed by the microprocessor 39 functioning as the second position component specifying means.

  That is, the rear end portion of the electrode 105 of the LGA 102 shown in FIG. 9 approaches the needle-like contact 2 from the front side in FIG. The process from step s24 to step s27 or from step s24 to step s30 is repeatedly executed until the contact 2 comes out behind. In the moving section of the LGA 102, the conduction state between the electrode 105 of the LGA 102 and the needle contact 2 is optimized at the moment when the center portion in the front-rear direction of the electrode 105 contacts the tip of the needle contact 2. Finally, the added value of T1, T2, T3, and T4 at this time is held as it is in the maximum value storage register Vmax as it is, and similarly, the central part in the front-rear direction of the electrode 105 is in a needle shape. The current position Py of the movable frame 19 at the moment of contact with the tip of the contact 2 is held as it is in the optimum lateral position storage register Ry.

  Then, when the front side end portion of the electrode 105 of the LGA 102 is cut out rearward of the needle-like contact 2 and the conduction state between the needle-like contact 2 and the electrode 105 corresponding to the needle-like contact 2 is not guaranteed, the determination in step s26 is made. The result is false, and further, the current position of the feed screws 37 and 38, that is, the current position of the movable frame 19 in the vertical direction (front-rear direction) in FIG. 9 reaches the stroke end, and the determination result in step s31 becomes true. The microprocessor 39 functioning as a part of the movable frame positioning means drives the vertical feed servo motor My to rotate the movable frame feed means 26, 27 and the feed screws 37, 38 in synchronism with each other. The position specified by the second position component specifying means by moving in the front-rear direction in FIG. In the central portion in the longitudinal direction of a position electrode 105 to position the movable frame 19 and LGA102 in a position in contact with the tip of the needle-shaped contact 2 shown (step s32).

  As described above, the conduction state between the needle-like contact 2 provided at the four corners of the bottom surface 104 of the fitting recess 13 of the LGA socket 1 ″ and the electrode 105 corresponding to each of the needle-like contact 2 is confirmed. However, by moving the movable frame 19 of the LGA socket 1 ″ vertically and horizontally along the surface of the base member 18, the LGA 102 is moved along the first and second alignment directions of the needle-like contacts 2, In the combination of the needle-shaped contact 2 and the electrode 105 to be confirmed, the position where the conduction state is confirmed in all combinations, particularly the center portion in the front-rear and left-right directions of the electrode 105 contacts the tip of the needle-shaped contact 2. Therefore, the position where the optimum conduction state is guaranteed is set as the optimum mounting position of the LGA 102 and the movable frame 19 and the positioning control of the movable frame 19 To complete the.

  Next, the microprocessor 39 functioning as the press-fitting control means outputs a further movement command to the press servomotor Mp and presses the LGA 102 with the applied pressure corresponding to the package mounting load Q1 by the tip of the pusher arm 22, and the LGA 102 The outer shape is completely press-fitted into the movable frame 19, and the LGA 102 is mounted and fixed in the fitting recess 13 of the LGA socket 1 "(step s33).

  At this stage, the LGA 102 further sinks and completely fits into the fitting recess 13, and all the needle-like contacts 2 including the needle-like contacts 2 having the relatively short needles 108b are electrodes corresponding to each of them. 105 is contacted. If the force required to ensure electrical continuity between the needle-like contact 2 and the one electrode 105 on the LGA 102 side is 0.5 N following the example of the first embodiment, the total number of needle-like contacts 2 Is 500, the package mounting load Q1 is 500 times that, that is, 250 N. However, in this third embodiment, a force for press-fitting the LGA 102 into the inner periphery of the movable frame 19 is also required. The actual package mounting load Q1 is a little larger than 250N.

  Next, the microprocessor 39 drives the raising / lowering servo motor Mz to raise the raising / lowering head of the position adjusting unit 17 to return to the retracted position (step s34), and further, the lateral feed servo motor Mx and the vertical feed servo motor. My is driven to return the feed screws 29, 34, 37, and 38 of the movable frame feeding means 23 to the original positions (step s35), and the press servomotor Mp is driven to return the pusher arm 22 to the standby position (step s35). s36).

  That is, in the LGA socket 1 ″ of the third embodiment, the mounting position adjusting means for adjusting the mounting position of the LGA 102 along the direction in which the needle-like contacts 2 are arranged is the base member that constitutes the bottom surface 104 of the fitting recess 13. 18 and a movable frame 19 movably attached along the surface of the base member 18.

  The mounting position fixing means for holding the adjusted mounting position of the LGA 102 is biased by an inner periphery of the movable frame 19 that allows the LGA 102 to enter the press-fitted state and prevents the LGA 102 from coming off, and a spring (not shown). Mechanical friction acting between the needles 108a and 108b and the electrode deployment surface of the LGA 102. The resistance prevents the mounting positions of the LGA 102 and the movable frame 19 in the direction along the surface of the base member 18 from being displaced.

  Here, the processing operation when the LGA 102 is mounted on the LGA socket 1 ″ using the position adjustment unit 17 has been described. However, the movable frame 19 of the LGA socket 1 ″ is electrically connected to the base member 18 while being moved manually. It is also possible to confirm the conduction state with the detector 14 and position the movable frame 19 and the LGA 102.

  Further, the control unit 38 shown in FIG. 6 and the processing operation algorithm shown in FIGS. 7 and 8 are diverted to the LGA socket 1 ′ shown in FIG. If the motors M1 and M2 of Example 1 and the motors M3 and M4 of Example 1 instead of the longitudinal feed servomotor My of Example 3 are driven and controlled, the LGA socket 1 'shown in FIG. It is also possible to position the LGA 102 at a position where is optimal.

It is the longitudinal cross-sectional view which showed the principal part of one Example of the socket for high density electrodes to which this invention is applied (Example 1). It is the longitudinal cross-sectional view which showed the state which mounted the electronic component package in the socket for high-density electrodes of the Example, and pre-pressurized (Example 1). It is the longitudinal cross-sectional view which showed the state which mounted the electronic component package in the socket for high density electrodes of the Example, and pressurized with the package attachment load (Example 1). A high-density electrode socket according to another embodiment provided with an adjustment screw rotation driving means for rotationally driving a package position adjustment screw constituting a part of the mounting position adjusting means and the mounting position fixing means of the high-density electrode socket is shown. (Example 2) which is a longitudinal cross-sectional view. FIG. 5 is a view showing a main part of a high-density electrode socket of another embodiment in which a package position adjusting screw is omitted and a position adjusting unit for positioning and fixing an electronic component package to the high-density electrode socket; (A) is the longitudinal cross-sectional view, and FIG. 5 (b) is a configuration of the movable frame feed means for lateral feed in the position adjustment unit of the electronic component package along the arrow AA in FIG. 5 (a). (Example 3) which was shown. It is the block diagram which showed the outline of the structure of the control part of the position adjustment unit of the Example (Example 3). It is the flowchart which showed the outline of the process which the microprocessor of the control part of the position adjustment unit of the Example performs (Example 3). It is a continuation of the flowchart which showed the outline of the process which the microprocessor of the control part performs (Example 3). It is the longitudinal cross-sectional view shown about the state which preloaded the package in the attachment process of the electronic component package by the position adjustment unit of the Example (Example 3). It is the longitudinal cross-sectional view shown about the state which pressed the package with the package attachment load in the attachment process of the electronic component package by the position adjustment unit of the electronic component package of the Example (Example 3). It is the longitudinal cross-sectional view which showed the example of mounting of LGA using a general LGA socket. It is the longitudinal cross-sectional view which showed the mounting process of LGA at the time of using a general LGA socket. It is the longitudinal cross-sectional view which showed the example which the position shift of the end surface reference | standard has produced in the electrode position of the LGA socket. It is the longitudinal cross-sectional view which showed the problem which generate | occur | produces when the position shift of the end surface reference | standard has arisen in the electrode position of the LGA socket. It is the longitudinal cross-sectional view shown about an example of the technique for ensuring the positioning accuracy between electrodes, Fig.15 (a) shows the state before mounting | wearing a socket with LGA, FIG.15 (b) shows LGA in a socket. The state after wearing is shown. It is the schematic diagram shown about another example of the technique for ensuring the positioning accuracy between electrodes.

1 LGA socket (Socket for high-density electrode)
1 'LGA socket (High density electrode socket)
1 "LGA socket (High density electrode socket)
2 Needle-shaped contacts 3, 4, 5, 6 Wall surface 7, 8, 9, 10 Package position adjusting screw (part of mounting position adjusting means)
11 mounting position adjusting means 12 mounting position fixing means 13 fitting recess (part of mounting position adjusting means)
14 Continuity detector 15 Adjustment screw rotation drive means 16 for horizontal feed Adjustment screw rotation drive means 17 for vertical feed 17 Position adjustment unit 18 of electronic component package Base member (part of mounting position adjustment means)
19 Movable frame (part of mounting position adjustment means, part of mounting position fixing means)
20 Protrusion 21 Stepped hole 22 Pusher arm (pressing means)
23 Movable frame feeding means 24 Horizontal frame movable frame feeding means (part of movable frame feeding means)
25. Horizontal frame movable frame feed means (part of movable frame feed means)
26. Vertical feed movable frame feed means (part of the movable frame feed means)
27 Movable frame feeding means for vertical feeding (part of movable frame feeding means)
28 Stay 29 Feed screw 30 Socket 31, 32 Timing belt 33 Socket 34 Feed screw 35, 36 Timing belt 37, 38 Feed screw 38 Control unit 39 Microprocessor (preload control means, first position component identification means, second position component identification) Means, movable frame positioning means, press-fitting control means)
40 ROM
41 RAM
42 Non-volatile memory 43 Input / output circuit 44 Manual operation panel 45 Display 46, 47, 48, 49 Driver 50, 51, 52, 53 A / D converter 101 LGA socket (Socket for high-density electrode)
102 LGA (electronic component package)
103 fitting recess 104 bottom surface 105 electrode 106 needle contact 107 sleeve 108 needle 108a needle (long)
108b Needle (short)
109 Substrate side contact 110 Wiring substrate 111 Wiring substrate side electrode 112 Inner layer wiring 113 Positioning pin 114 Positioning hole 115 Electrode surface 116 Positioning pin 117 Socket 118 Hole 119 Inspection socket 120 Small camera 121 Semiconductor device 122 Image recognition unit 123 Output unit 124 Cross table Q0 Preload Q1 Package mounting load M1 Motor (part of adjusting screw rotation drive means for lateral feed)
M2 motor (part of adjustment screw rotation drive means for lateral feed)
M3 motor (part of adjusting screw rotation drive means for vertical feed)
M4 motor (part of adjusting screw rotation drive means for vertical feed)
Mx Servo motor for transverse feed My Servo motor for longitudinal feed Mz Lifting servo motor Px Pulse coder Py Pulse coder Pz Pulse coder

Claims (3)

From the bottom surface of the rectangular fitting recess to which the electronic component package is detachably mounted, a plurality of needle-like contacts individually contacting each of the plurality of electrodes closely arranged on one surface of the electronic component package is provided. Fixed to the bottom surface in a state of being independently urged and projected toward the one surface of the package, and at least three corners of the bottom surface of the fitting recess from other needle contacts Is a mounting method of an electronic component package using a high-density electrode socket in which a protruding amount is large, and the degeneracy limit of the tip portion is provided with a needle-like contact equivalent to other needle-like contacts,
The electronic component package is placed in the fitting recess of the high-density electrode socket,
The electronic component package is placed on the bottom surface of the fitting recess by the force of the needle contact needles disposed at at least three corners among the four corners of the bottom surface of the fitting recess slightly sinking against the biasing force. In a state preloaded toward
While confirming the conduction state between the needle-shaped contacts provided at at least three of the four corners of the bottom surface of the fitting recess and the electrodes corresponding to the needle-shaped contacts, the electronic component package is removed from the needle. Move vertically and horizontally along the direction of the contact,
In the combination of the needle-like contact and the electrode that are the confirmation target of the conduction state, the movement of the electronic component package is stopped at the position where the conduction state is confirmed in all combinations,
Furthermore, the electronic component package is directed toward the bottom surface of the fitting recess, and all the needle-like contacts including the needle-like contacts having relatively short needles are brought into contact with the corresponding electrodes. An electronic component package mounting method using a high-density electrode socket, wherein the electronic component package is mounted in the fitting recess in a pressurized state to hold the mounting position. For each wall surface that is screwed into a mold around the fitting recess in a state where each of the four wall surfaces surrounding the fitting recess penetrates from the outside toward the inside, and the tip is brought into contact with the outer shape of the electronic component package Package position adjustment of each set of wall surfaces facing each other so that the package position adjustment screws arranged on each of the wall surfaces facing each other in the mounting position adjusting means constituted by the package position adjustment screws of By rotating the screw, the electronic component package is moved vertically and horizontally along the direction in which the needle-shaped contacts are arranged,
In the combination of the needle-like contact and the electrode that are the confirmation target of the conduction state, the movement of the electronic component package is stopped at the position where the conduction state is confirmed in all combinations,
Furthermore, by pressing the electronic component package toward the bottom surface of the fitting recess with the package mounting load, the electronic component package is completely fitted into the fitting recess, and the outer shape of the electronic component package is obtained. 2. The electronic component package using the high-density electrode socket according to claim 1, wherein the mounting state of the electronic component package is held by a pressing force of the package position adjusting screw with which the tip is in contact. Wearing method. It comprises a base member that constitutes the bottom surface of the fitting recess and a movable frame that surrounds the fitting recess, the inner periphery of the movable frame being formed in accordance with the outer shape of the electronic component package, and the movable frame being The base member cannot be moved toward and away from the base member, and at least along the surface of the base member by a distance equivalent to the maximum displacement amount of the arrangement position of the electrodes with respect to the outer shape of the electronic component package. The electronic component package is partially fitted into the movable frame provided in the mounting position adjusting means that is movable in the vertical and horizontal directions, so that the electronic component package is preloaded toward the bottom surface of the fitting recess and the movable. Moving the electronic component package along the alignment direction of the needle-like contacts by moving the frame vertically and horizontally along the surface of the base member;
Stop the movement of the electronic component package by stopping the movement of the movable frame at the position where the conduction state is confirmed in all combinations in the combination of the needle-like contact and the electrode that are the confirmation target of the conduction state. Let
Further, the electronic component package is pressed with a package mounting load toward the bottom surface of the fitting recess to press-fit the electronic component package into the movable frame to prevent the electronic component package from coming off, and each of the electrodes The position of the electronic component package and the movable frame in the direction along the surface of the base member is displaced by utilizing a mechanical frictional resistance acting between each of the electrodes and the needle-shaped contact that is contracted in contact with the electrode. 2. The method of mounting an electronic component package using a high-density electrode socket according to claim 1, wherein the mounting state of the electronic component package is prevented and the mounting state of the electronic component package is maintained.

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