JP2002261492A - Ic component mounting method and mounter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for mounting an IC component with high accuracy without causing any positional shift due to thermal expansion. SOLUTION: The IC component P is heated at the time of mounting and positional regulation of a substrate B is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for mounting an IC component, particularly a flip chip, which can be suitably applied to a case in which a flip chip is directly mounted on a circuit board.

[0002]

2. Description of the Related Art Conventionally, as a method of mounting an IC component on a circuit board, a packaged IC component having leads protruding from a side is supplied, and this IC component is sucked by a mounting head at the supply position. A method of recognizing an image of the picked-up attitude of the picked-up IC component by a component recognition unit, correcting the picked-up attitude of the IC component, mounting the IC component at a mounting position on a circuit board, and soldering a lead of the IC component to an electrode of the circuit board. Is generally adopted.

[0003] Flip chip bonding, in which a flip chip is mounted face down on an insulating substrate and the electrode of the flip chip is directly connected to the electrode of the insulating substrate, is also known as an alternative to wire bonding.

[0004]

By the way, in recent years, in order to develop high-performance and small-sized electronic devices, high integration and miniaturization of IC parts, and thereby multi-pin and narrow pitch have been advanced. As a method of realizing ultra-small electronic devices such as a mobile phone and a pocket word processor, mounting a flip-chip IC directly on a circuit board is considered. It is necessary to supply the IC to the supply position face down with the bonding electrode arrangement surface facing down. Therefore, if the flip chip IC is stored face down in a tray or the like and transported, it is formed on the electrode during transport. There is a problem that an appropriate bonding state may not be obtained after mounting due to damage of the bumps. Therefore, the conventional flip chip I
C was stored face-up in a tray or the like and transported. At the time of mounting, the work was carried out by hand from the transport tray to the mounting tray and stored face down. There was a problem that the above problem could not be completely solved because the storage was made down.

A face-up flip chip I
When suctioning C at the supply position, the suction nozzle contacts and damages the bump portion, an appropriate suction state cannot be obtained, or the suction nozzle simply descends to a certain position during the suction operation. , The flip chip I
There is a problem that the flip chip circuit may be damaged due to strong collision with the C face.

When a flip chip IC is directly mounted on a circuit board, a multilayer board made of glass epoxy resin is often used as the circuit board. There is a problem in that a slight inclination exists on the mounting surface for each mounting position, and when the flip-chip IC is mounted in that state, the bonding between the bump and the circuit board electrode may not be performed properly.

As a method of directly mounting the flip-chip IC on the circuit board, there is a method of controlling the pressing force of the flip-chip IC or controlling the heating of the flip-chip IC, but cannot be performed by a conventional mounting apparatus. There is a problem.

In the case of heating, if the mounting is performed with the reference side of the board regulating means fixed, there is a problem that the mounting position on the board is displaced due to the thermal expansion of the board, so that high-precision mounting cannot be performed.

SUMMARY OF THE INVENTION The present invention solves one of the above-mentioned conventional problems. In a joining requiring heating control, an IC which can be mounted with high precision without causing a displacement due to thermal expansion even when heated. It is an object of the present invention to provide a component mounting method and device.

[0010]

According to the present invention, there is provided an IC component mounting method, wherein an IC component is adsorbed by a mounting head, the position of the IC component adsorbed by the mounting head is recognized, and the reference position or the position of the regulated substrate is determined. Recognize the IC component mounting position,
An IC component mounting method for positioning and mounting a C component at an IC component mounting position on a substrate is characterized in that the IC component is heated when the IC component is mounted, and the position restriction of the substrate is released.

Further, the IC component mounting apparatus of the present invention provides an IC component supply means for supplying IC components, a board installation table for regulating and holding a board on which the IC components are mounted, and an IC module for sucking the supplied IC components. A mounting head having a tool for mounting the IC component mounting position on the board and a board recognizing means for recognizing the reference position of the substrate or the IC component mounting position, a heating means for a tool provided on the mounting head, and a tool A component recognizing means for recognizing the position of the component adsorbed on the substrate mounting table, the two sides adjacent to the four sides of the substrate installation table are engaged with the side edges of the substrate to regulate the position of the reference side. A regulating means is provided, a movable-side regulating means for regulating the substrate by pressing the substrate toward the reference-side regulating means is provided on the remaining two sides, and a means for retracting the reference-side regulating means to the regulation releasing position is provided. , When mounting the IC component with heated tools in the substrate, the reference side of the regulating means and the movable-side regulating means or the same time, characterized in that retracting movement to the restriction release position.

[0012]

According to the IC component mounting method of the present invention, when the IC component is heated and mounted, the mounting position is released even when the substrate is thermally expanded by removing the restriction on the position of the substrate at the time of mounting. Since the thermal expansion is performed around the center, the mounting position on the substrate side does not shift due to the thermal expansion, and high-precision mounting can be performed.

According to the IC component mounting apparatus of the present invention, when mounting by heating, both the reference-side restricting means and the movable-side restricting means for restricting the board at the time of mounting are moved to the restriction releasing position. Accordingly, the regulation of the substrate can be released in all directions, and the IC component mounting method of the present invention can be implemented with a reasonable device configuration.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 2 shows the overall configuration of the IC component mounting apparatus.
In FIG. 3, reference numeral 1 denotes an IC component supply means, which supplies an IC component (flip chip IC) to a supply position in a face-up attitude with the surface on which the bonding electrodes (bumps) are arranged facing upward. Reference numeral 2 denotes an IC component suction reversal transport unit, which turns the IC component upside down while transporting the IC component to the transfer position after sucking the IC component at the supply position, and sets the IC component sucked at the transfer position to the face-down attitude. Reference numeral 3 denotes a board setting table for holding a board on which an IC component is to be mounted while regulating its position. Reference numeral 4 denotes a mounting robot, which is configured to move the mounting head 5 in the X and Y directions in two horizontal directions and the Z direction in the vertical direction and to be able to position the mounting head at an arbitrary position.
The C component is sucked and mounted at an arbitrary position on the board whose position is regulated on the board installation table 3.

Reference numeral 6 denotes a component recognizing means for recognizing a suction position of the IC component adsorbed on the mounting head, and a component outline recognizing camera 7 for recognizing the external shape of the component and a high precision for recognizing a pattern or a positioning mark on the IC component. It consists of a recognition camera 8. Reference numeral 9 denotes a tool changer for exchanging a tool for sucking an IC component according to the type of the IC component. Reference numeral 10 denotes a transfer means for attaching a silver paste for bonding to an electrode (bump) of an IC component by transfer. Numeral 11 denotes a parallelism detecting means for detecting the parallelism of the tool. Numeral 12 denotes a displacement detecting means provided with a jig for detecting a mechanical displacement such as an optical system or a guide occurring with time and performing position correction. 13 is a suction nozzle changer, 14 is a waste conveyor, and 15 is a waste box.

Reference numeral 16 denotes a substrate carry-in conveyor, 17 denotes a substrate preheating means for preheating the carried-in substrate, 18 denotes a carry-in / transfer means for adsorbing the substrate on the substrate preheating means 17 and transferring the substrate onto the substrate setting table 3. Reference numeral 19 denotes a substrate unloading conveyor, and reference numeral 20 denotes a substrate unloading conveyor 19 which sucks the substrate on the substrate setting table 3.
This is an unloading / transferring means for transferring the data to a destination.

As shown in FIG. 4, the IC component supply means 1 holds a tray 21 in which IC components are stored and held in a matrix in a face-up state, in parallel with a tray plate 22, and holds the tray plate 22 in a magazine 23. The IC components are supplied in a state of being stored in a plurality of stages. Reference numeral 22a denotes a holder for pressing and fixing each tray 21. Reference numeral 23a denotes a pull-out preventing piece of each tray plate 22, which is pivotally supported by one side edge of the magazine 23 so as to be openable and closable.

When the magazine 23 is mounted on a lifter 24 as shown in FIG. 5, an arbitrary tray plate 22 in the magazine 23 is positioned at a predetermined height, and the drawer shown in FIG. The tray plate 22 is pulled out by the means 25, and an arbitrary IC component accommodated in the tray 21 is positioned at the supply position. The lifter 24 is supported by a frame 26 so as to be able to move up and down, and is configured to store and hold the magazine 23 in an elevating frame 28 that is driven up and down by a feed screw mechanism 27. 2
6a is a magazine mounting table provided on the frame 26, 2
9 is a drive motor of the feed screw mechanism 27.

The IC component suction / reverse transport means 2 includes a moving body 32 which reciprocates between a supply position and a transfer position along a moving rail 31 extending in a direction perpendicular to the direction in which the tray plate 22 is pulled out. As shown in FIG. 6, an elevating base 33 is provided which can be moved up and down, and a reversing frame 34 is provided on the elevating base 33 for reversing from a downward posture to an upward posture while moving from the supply position to the transfer position. A suction nozzle 35 is provided on the reversing frame 34. Further, the moving body 32 is provided with a height detection sensor 36 for detecting the height of the IC component at the supply position, and a recognition camera 37 for recognizing the shape of the IC component as an image. Reference numeral 38 denotes a suction unit for sucking IC components, which is configured to detect a suction pressure at the time of suction to detect whether or not the suction state is appropriate. 39 is a rotating means of the suction nozzle 35.

As shown in FIGS. 2 and 7, the mounting head 5 has a tool 41 for adsorbing IC components, a lifting and lowering mechanism 42, and a substrate for recognizing a reference position of the substrate or an IC component mounting position. A recognition camera 43 and a dispenser 44 for applying an adhesive are provided. The lifting / lowering pressure mechanism 42
8, a lifting frame 47 driven up and down by a feed screw mechanism 46 driven by a motor 45 for lifting.
A pressure cylinder 48 and a self-weight compensation cylinder 49 are attached to the cylinder, and an elevating body 50 supported by these cylinders so as to be able to move up and down.
Are connected, and the tool mounting unit 51 is
Are rotatably disposed about a vertical axis. A pressurizing force detection sensor 52 composed of a load cell is interposed between the pressurizing cylinder 48 and the elevating body 50, and the pressurizing cylinder 48 is feedback-controlled according to the detected pressure so that pressurization can be performed accurately at a desired pressurizing force. Is configured. Reference numeral 53 denotes a rotating means for positioning the tool mounting unit 51 at an arbitrary rotation position, and reference numeral 54 denotes a cool air blow nozzle for blowing cooling air to the mounting position to cool the mounting position.

As shown in FIG. 9, the tool mounting unit 51 includes a mounting member 56 fitted and fixed to a lower end of a mounting shaft 55 rotated by a rotating means 53 and a cooling jacket 57 mounted below the mounting member 56. , And a tool attachment member 58 attached to a lower portion thereof. Tool mounting member 5
8 hangs down the heat transfer regulating small cross section 60 from the mounting plate 59 with respect to the cooling jacket 57, and attaches the tool mounting portion 6 to the lower end thereof.
1 is provided. A tool contact surface 62 is formed on the lower surface of the tool mounting portion 61, and the tool 41 having a shape corresponding to each IC component is detachably sucked and held.

The tool 41 is a flat member having a mounting surface 41b parallel to the IC component suction surface 41a, and has a suction hole 63 at the center thereof. Further, on both sides of the mounting surface 41b, regulating engagement portions 64 for regulating the position of the tool 41 are provided. Suction passage 6 for sucking components that communicates with suction hole 63
5 is formed so as to penetrate through the tool mounting member 58 and the cooling jacket 57 and open to the outer periphery of the mounting member 56. A tool suction hole 66 is opened on both sides of a suction passage 65 in the tool contact surface 62, and a suction passage 67 for tool suction is opened through the tool mounting member 58 and the cooling jacket 57 on the outer periphery of the mounting member 56. It is formed so that. The tool mounting portion 61 is provided with a tool mounting portion temperature detecting means 69 such as a heater 68 and a thermocouple. A thin shaft portion 70 is provided on the mounting member 56, and a plurality of adjustment screws 72 screwed around an adjustment plate portion 71 below the thin shaft portion 70, and the degree of parallelism of the IC component suction surface 41 a of the tool 41 to the board installation table 3 is adjusted. Is configured to be adjustable. In FIG. 7, reference numeral 73 denotes a vacuum ejector for sucking the tool 41;
4 is a vacuum ejector for adsorbing IC components, and 75 is a pneumatic regulator.

As shown in FIG. 10, the tool changer 9 has a plurality of tool mounting portions 76 for mounting and supporting the tool 41.
A pair of holding members 77a and 77b for holding the diagonal position of the tool 41 of each tool mounting portion;
An opening / closing drive unit 78 that opens and closes 7a and 77b collectively in the arrow direction and a detection unit 79 that detects the presence or absence of each tool are provided.

A plurality of tool suction surface temperature detecting means 80 are provided on the bottom surface of the tool mounting portion 76 of the tool changer 9 as shown in FIG. The actual temperature of the IC component suction surface 41a when the tool 41 is heated by the heater 68 and its distribution are detected by the tool suction surface temperature detecting means 80, and the relative temperature is detected by the tool mounting part temperature detecting means 69. The temperature of the IC component suction surface 41a can be accurately set to a predetermined temperature by controlling the heater 68 based on the temperature detected by the tool mounting portion temperature detecting means 69. .

As shown in FIG. 12, the substrate setting table 3 is configured to hold the substrate by suction and to control the substrate to a desired temperature by a built-in heater 81 and temperature detecting means 82. . The substrate installation table 3 is installed on a support table 83 in which a cooling water pipe 84 is built in to prevent heat transfer to parts other than the substrate installation table 3. 85 is a suction pipe for suction, and 85a is a suction switch.

On the support table 83, reference side regulating means 86, 87 for regulating the position by engaging the side edges of two adjacent sides of the four sides of the substrate on the substrate setting table 3, and the remaining two. Movable regulating means 88, 89 for regulating the side by pressing it toward the regulating means 86, 87 on the reference side are provided. The first reference side restricting means 86 moves a restricting member 91 having a plurality of restricting rollers 90 arranged in parallel so as to engage over substantially the entire length of one side of the substrate with a cylinder 92 via a lever interlocking mechanism 93 to a restricting position. It is configured to be movable between the restriction release position. Also, the second reference side regulating means 8
7 and the movable-side restricting means 88 and 89 are configured so that the restricting roller 94 can be urged and retracted by the cylinder 95 toward the side edge of the substrate, and the second reference-side restricting means 87 has its urging force. Is set large. Thus, the restriction means 86 to 89 regulate the substrate to a predetermined position, and can release the restriction at the time of mounting and heating. Reference numeral 96 denotes a board detection sensor for detecting a board on the board installation table 3, and 97 denotes its amplifier.

As shown in FIGS. 13 and 14, the support table 83 has a pair of fixed guide rollers 98 respectively engaged with two adjacent side end faces of the four peripheral side end faces, and the other two side end faces. The pair of pressing guide rollers 99 respectively engaged with the end faces are supported so as to be able to ascend and descend and tilt by a small amount. The pressing guide roller 99 is urged by a pressing mechanism 100 including a spring and a lever. On the lower surface of the support table 83, support rollers 101 are provided at two places at both ends on one side and one place at the center on the other side, for a total of three places. Height adjusting means 102 for adjusting each independently is provided. The height adjusting means 102 includes a movable wedge-shaped member 104 which is movable along the inclined guide 103 and has a horizontal upper surface with which the support roller 101 is rotatably engaged, and a feed screw mechanism which moves and drives the movable wedge-shaped member 104. 105 and a drive motor 106 for rotating the feed screw. Thus, the height of the support table 83 at an arbitrary position is changed by adjusting the heights of two places at one end on one side of the support table 83 and one place at the center on the other side by each height adjusting means 102. It is configured such that the inclination of the position can be arbitrarily adjusted without any change.

As shown in FIG. 15, the transfer means 10 supplies silver paste for electrode bonding onto a transfer plate 111 from a supply nozzle 112, and drives a plurality of leveling plates 113 to 115 which are rotationally driven by a drive motor 116. To form a uniform thin film of silver paste on the transfer plate 111. Thus, by slightly pressing the IC component on the transfer plate 111, the silver paste is transferred and adhered to the bump.

As shown in FIG. 16, the parallelism detecting means 11 includes four level gauges 1 vertically mounted on a horizontal mounting plate 117.
In the state in which the measuring plate is sucked to the tool 41, the four corners are pressed against these level gauges in a state where the tool 41 is sucked, whereby the inclination of the IC component suction surface 41a of the tool 41 with respect to the horizontal reference plane can be detected. It is configured as follows. Then, the adjusting screw 72 of the tool mounting member 58 is adjusted as described above in accordance with the detected inclination, so that the IC component suction surface 41a coincides with the horizontal reference surface.

FIGS. 17 to 19 show the displacement detecting means 12.
As shown in FIG. 7, a lower jig plate 122 made of a transparent glass plate and having a suction hole 123 formed in the center is fixedly disposed on the upper surface of a support 121, and an upper jig made of a transparent glass plate is provided thereon. The component plate 124 is placed. Suction hole 1
Reference numeral 23 is communicated with the vacuum suction means 125 so that the upper jig plate 124 placed on the lower jig plate 122 can be fixed by suction. The lower jig plate 122 indicates a virtual mounting position, and the upper jig plate 124 indicates a virtual IC component mounted at the mounting position. On the lower surface of the upper jig plate 124, as shown in FIG. 18B, a center mark 126 is formed at a center position, and misregistration detection marks 127a and 127b are formed at a pair of diagonal positions. As shown in FIG. 18A, on the upper surface of the component plate 122, the misregistration detection marks 128a, 1
When the upper jig plate 124 is overlaid on the lower jig plate 122 in a regular positional relationship, FIG.
The state shown in (a) and (b) is obtained. Reference numeral 129 is a visual confirmation mark.

Loading and transferring means 18 and unloading and transferring means 20
Have substantially the same configuration, and as shown in FIG.
Moving body 13 movable along common moving rail 131
2, a support arm 133 extends from the support arm 1.
The suction pad 1 is provided at each tip corresponding to the four corners of the 33 substrate.
34 are attached. The moving body 132 is configured to be movable and driven by an endless drive belt 135 stretched along the moving path. 136 is the drive pulley.

Next, the mounting operation of the IC component by the IC component mounting apparatus having the above configuration will be described mainly with reference to the operation flowchart of FIG. In this embodiment, as shown in FIG. 24, an IC component P composed of a flip chip IC is directly mounted on a multilayer circuit board B, and a large number of IC components P formed on one side (face) of the IC component P are formed. A bump b as a bonding electrode is provided on the surface electrode t, and the bump b is bonded to the electrode d of the multilayer circuit board B with a bonding metal m made of silver paste, and between the IC component P and the multilayer circuit board B. Is sealed with the thermosetting adhesive r filled therein and integrally fixed.

In this case, in order to prevent the bump b from being damaged during the transfer from the IC component P manufacturing factory to the mounting factory, FIG.
As shown in the figure, the IC component P is supplied in a face-up state with the surface on which the bump b is provided facing upward. Therefore, when taking out the IC component P, the suction nozzle 35 is connected to the bump b as shown by a virtual line. It is necessary to position and adsorb at a position that does not interfere.

In this embodiment, since the mounting is completed simultaneously with the mounting of the IC component P, it is necessary to press and heat the IC component P along a predetermined profile as shown in FIG. That is, first over t ₁ hour after addition of the initial pressure P ₁ pressurized to P _2, gradually increasing then temperature while maintaining the pressure from the T _1, T ₃ over t ₂ hours After maintaining the heating / pressurized state for t ₃ hours, the temperature is cooled to T ₂ over t ₄ hours, and then the pressing force is lowered to the initial pressing force P ₁ over t ₅ hours. It is necessary to perform heating and pressurization with a profile of releasing pressurization.

Referring to FIG. 1, the operation of loading and unloading the circuit board B will be described first. The board B is loaded onto the board preheating means 17 by the loading conveyor 16 and preheated. When the mounting on the substrate B on the substrate setting table 3 is completed, the suction of the substrate B is released, and then the substrate B on the substrate preheating means 17 is transferred onto the substrate setting table 3 by the loading and transferring means 18 and is simultaneously unloaded. The substrate B on the substrate setting table 3 is transferred onto the unloading conveyor 19 by the transfer means 20. The substrate B transferred onto the substrate installation table 3 is
The positioning of the movable members 6 and 87 and the movable-side regulating members 88 and 89 to the regulating positions is regulated, and then they are sucked and fixed and held. The substrate B is maintained at a predetermined temperature by heating the substrate setting table 3 by the heater 81 while detecting the temperature by the temperature detecting means 82.

Next, the operation of supplying the IC component P to the mounting head 5 will be described.
After operating the lifter 24 to position the tray plate 22 containing the IC component P to be mounted next at a predetermined drawer height position, the drawer 25 draws out the tray plate 22, and the I
The tray plate 22 is positioned so that the C component P is located at a position (supply position) on the movement path of the suction nozzle 35.

Next, the moving body 32 of the IC component suction reversing and conveying means 2 is moved to this supply position, and is suctioned by the suction nozzle 35. At this time, in order to perform appropriate suction as shown in FIG. 25, first, as shown in FIG. 21A, the recognition camera 37 is positioned above the IC component P, and the accurate position of the IC component P is detected. Then, the position of the tray plate 22 is corrected by the drawer 25 in accordance with the detection result, and the amount of movement when positioning the height detection sensor 36 and the suction nozzle 35 on the IC component P is corrected. Next, as shown in FIG. 21B, the height of the suction position of the IC component P is detected by the height detection sensor 36, and then the suction nozzle 35 is set to the IC component P.
Then, the suction nozzle 35 is lowered to a position where a minute gap is formed between the suction nozzle 35 and the IC component P as shown in FIG. 21C, and the IC component P is suctioned in this state.
By controlling the lowering position of the suction nozzle 35 in this way, it is possible to eliminate the possibility that the suction nozzle 35 will strongly collide with the face of the IC component P and damage the circuit.

The abnormality in the suction state is detected by the suction pressure in the suction unit 38. If there is an abnormality, the moving body 32 is moved to the position of the waste conveyor 14 and discarded, and the next IC component P is supplied. Adsorb. Next, if necessary, the suction nozzle 35 is rotated by the rotation means 39 to change the rotation posture of the IC component P, and the moving body 32 is moved toward the transfer position. At the transfer position, the suction nozzle 35 faces upward, and the IC component P is supplied to the mounting head 5 in a face-down attitude.

Next, the mounting operation of the IC component P on the board B will be described. While moving the mounting head 5 toward the next mounting position, the board mounting table 3 is moved in accordance with the inclination of the mounting position of the board B. By adjusting the heights of the three support points of the support table 83 on which the mounting is performed by the height adjusting means 102, the inclination is corrected without changing the height of the mounting position, and the surface of the mounting position of the substrate B is corrected. The tool 41 IC
It is made exactly parallel to the component suction surface 41a.

That is, when the substrate B is a multi-layer substrate, the inclination of the surface of the substrate B changes depending on its position due to the lower layer pattern. The inclination state generally has the same tendency for the boards B of the same model, and does not greatly change between the individual boards B of the same model. Therefore, the inclination at each mounting position of the board B is measured in advance for each model. And the board B as described above according to the inclination of each mounting position.
By performing the inclination correction, the bump b of the IC component P can be joined to the electrode d of the substrate B, and the IC component P can be mounted with high reliability.

As a method of measuring the inclination at each mounting position of the substrate B, it is conceivable to directly measure a change in the height of the mounting position of the substrate B. Is large, it is not possible to determine from which measurement point the inclination is to be calculated, and it is not possible to perform highly accurate measurement. Therefore, in this embodiment, the IC component P or its model is held by the mounting head 5, and as shown in FIG.
By pressing the bump b against the mounting position of the substrate B, the bump b is plastically deformed at the electrode d of the substrate B.
As shown in (b), the height of each bump b of the IC component P or the model is measured by scanning the height detecting means H, and the inclination of the board B at the mounting position is determined from the heights. Calculation is performed, and the inclination of each mounting position on the board B of each model is registered in advance in the control unit of the IC component mounting apparatus. Then, for each mounting operation of the IC component P at each mounting position of the board B, the heights of the three support points of the support table 83 are adjusted as described above, and as shown in FIG. Correct the tilt.

Next, when the mounting head 5 reaches the position immediately above the mounting position, the board recognition camera 43 recognizes the mounting position pattern or the mounting position mark, and measures the accurate mounting position. Next, the mounting head 5 is moved toward the transfer position, and the tool 41 is rotated by the rotating means 53 in accordance with the rotation posture of the IC component P during the movement. Adsorb at.

Next, the mounting head 5 is moved to the transfer means 10 and the silver paste m is transferred to the bumps b of the IC component P by pressing the IC component P against the transfer plate 111. Next, the mounting head 5 is moved toward the component recognizing means 6, and during that time, the heater 68 of the tool mounting portion 61 is energized to heat the tool 41 to evaporate and remove the organic solvent of the silver paste m. Cooling air is blown from the cold air blow nozzle 54 to cool the adhesive so that it does not adversely affect the immersion into the thermosetting adhesive r in a later step.

When the mounting head 5 reaches the component recognizing means 6, the IC component P sucked by the tool 41 is positioned on the component outer shape recognition camera 7, and the outer shape and the approximate suction position of the IC component P are recognized. I do. If an appropriate IC component P is not suctioned or the suction posture is not proper, the IC component P is discarded in the disposal box 15. When an appropriate IC component P is properly sucked, the positioning is performed such that a predetermined pattern or a positioning mark of the IC component P falls within the field of view of the high-precision recognition camera 7 according to the roughly detected position of the IC component P. Then, the suction position of the IC component P is recognized with high accuracy.

Next, the mounting head 5 is positioned so that the dispenser 44 is located immediately above the mounting position of the substrate B.
The dispenser 44 applies a thermosetting adhesive r to the center of the mounting position.

Next, the IC component P is positioned just above the mounting position of the substrate B, and the tool 41 is lowered, thereby pushing and spreading the thermosetting adhesive r applied earlier.
The IC component P is mounted so that the gap between the C component P and the substrate B is completely filled with the thermosetting adhesive r. At the time of mounting the IC component P, the mounting head 5 is mounted on the mounting head 5 based on the position data of the mounting position of the substrate B recognized by the substrate recognition camera 43 and the position data of the suction position of the IC component P recognized by the high precision recognition camera 8. The mounting position data is corrected, and the IC component P is mounted on the mounting position of the board B with high accuracy. Next, the pressurizing cylinder 48 pressurizes the tool 41 while the pressurizing force detection sensor 52 detects the pressurizing force and performs feedback control. While the tool 41 is heated by the heater 68, the IC component P is mounted on the board B by applying pressure and heating according to the profile shown in FIG.

At the time of pressurizing and heating, the reference side regulating means 8
6 and 87 are fixed, and the movable side restricting means 88 and 89 are
2 is retracted by the amount of thermal expansion of FIG.
As shown in FIG. 3A, the correct mounting position of the IC component P is displaced to the position indicated by the imaginary line.
Since the mounting position is fixed at the position indicated by the solid line at 1, the mounting position is displaced. Therefore, in this embodiment, FIG.
As shown in FIG. 3B, when the tool 41 presses and heats, the regulating roller 90 of the first reference-side regulating means 86, and the second reference-side regulating means 87 and the movable-side regulating means 88, 89.
Are moved by the cylinder 92 and the cylinder 95 from the regulation position shown by the solid line to the retreat position shown by the virtual line. By doing so, the substrate B thermally expands in all directions around the mounting position, so that there is no displacement of the mounting position.

After pressing and heating for a predetermined time, the bump b of the IC component P is joined to the electrode d of the substrate B with the silver paste m, and the thermosetting adhesive r is cured. Cooling air is blown from the cool air blow nozzle 54 toward the mounting portion to cool the device, and the pressure is released to complete the mounting operation.

For the substrate B on the substrate setting table 3,
The required IC components P are mounted on the board B by repeating the above operation. At this time, if the suction nozzle 35 or the tool 41 needs to be replaced because the shape or size of the IC component P to be mounted on one substrate B is different, the next IC component P Prior to the mounting operation, the moving body 32 is moved to the suction nozzle changer 13 and the mounting head 5 is moved to the tool changer 9 so that the suction nozzle 35 and the tool 41 corresponding to the next IC component P respectively.
Replace with

Positions that occur over time, such as a positional shift due to thermal expansion and contraction of the mounting robot 4 due to a change in ambient temperature, and a positional shift due to expansion and contraction of an adhesive used in an optical system due to a change in humidity. In order to correct the displacement, the displacement amount is measured at regular time intervals using the displacement detection means 12, and the mounting position data is automatically corrected.

Specifically, the upper jig plate 1 is
The mounting head 5 is positioned so as to be positioned on the optical axis of the high-precision recognition camera 8 in a state in which the center mark 126 is sucked, the center mark 126 is recognized, and then the tool 41 is rotated by 180 ° to set the center mark 126 again. recognize. Then these 2
The middle point of one recognition position is the center coordinate of the mounting head 5,
If the position has changed from the initial value, the amount of the change is used as the amount of displacement of the mounting head 5 to correct the offset data.

Next, the upper jig plate 124 is sucked by the tool 41 and the upper jig plate is picked up by the high-precision recognition camera 8 in order to correct a mounting position shift due to a position shift between the board recognition camera 43 and the tool 41. The position detecting marks 127a and 127b at diagonal positions of the position 124 are respectively recognized, and the suction position of the upper jig plate 124 is calculated from the recognized position and the position of the mounting head 5. Next, the mounting head 5 is moved onto the displacement detection means 12, and the displacement detection marks 128 a and 128 b of the lower jig plate 122 are respectively recognized by the board recognition camera 43 to determine the mounting position. The sucked upper jig plate 124 is mounted on the lower jig plate 122, and the upper jig plate 124 is fixed by suction through the suction holes 123. FIG. 19 shows the state in which the upper jig plate 124 is simulated and mounted.
As shown by the imaginary line in (b), the displacement detection marks 127a and 128a are placed in the field of view of the board recognition camera 43, and their relative positions are obtained. And the relative position between the lower jig plate 122 and the upper jig plate 124 are obtained by calculating the relative position between them. This operation is repeated a plurality of times, and the offset data between the board recognition camera 43 and the tool 41 is corrected by calculating the average value of the displacement amount. By performing the above-described correction processing at appropriate time intervals, it is possible to eliminate the occurrence of a displacement error due to a change with time, and to perform mounting with high accuracy.

In the above description of the embodiment, an example is shown in which the silver paste m is transferred by the transfer means 10 to the bumps b of the IC component P during the mounting operation. P can also be supplied, in which case it is needless to say that the transfer means 10 does not need to be provided.

Further, in the above embodiment, the example in which the IC component P composed of the flip-chip IC supplied in the face-up state is directly mounted on the circuit board B has been described. The present invention can also be applied in a form in which the IC component suction reversing and conveying means is omitted even when mounting on a circuit board with high precision.

[0056]

According to the IC component mounting method of the present invention, I
When mounting by heating the C component, by releasing the position regulation of the board at the time of mounting, even if the board thermally expands due to heating, it thermally expands around the mounting position.
There is no displacement of the mounting position on the substrate side due to thermal expansion, and high-precision mounting can be performed.

According to the IC component mounting apparatus of the present invention, in the case of mounting by heating, both the reference-side restricting means and the movable-side restricting means for restricting the substrate at the time of mounting are moved to the restriction releasing position. Thus, the regulation of the substrate can be released in all directions, and the IC component mounting method of the present invention can be implemented with a reasonable device configuration.

[Brief description of the drawings]

FIG. 1 is a flowchart of an IC component mounting operation according to an embodiment of the present invention.

FIG. 2 is an overall plan view of the IC component mounting apparatus of the embodiment.

FIG. 3 is an overall perspective view of the IC component mounting apparatus of the embodiment.

FIG. 4 is a perspective view of a tray plate and a magazine in the embodiment.

FIG. 5 is a perspective view of a lifter according to the embodiment.

FIG. 6 is a perspective view of a moving body of the IC component suction reversal conveyance means in the embodiment.

FIG. 7 is a perspective view of a mounting head according to the embodiment.

FIG. 8 is a schematic diagram of a pressing mechanism of the mounting head in the same embodiment.

FIG. 9 shows a tool mounting unit in the embodiment.
(A) is a partial sectional front view, and (b) is a longitudinal side view.

FIG. 10 is a perspective view of a tool changer in the embodiment.

FIG. 11 is a longitudinal sectional view showing temperature detecting means of a tool suction surface in the tool changer of the embodiment.

FIG. 12 is a perspective view of a substrate mounting table in the embodiment.

FIG. 13 is a plan view of a tilt adjusting means of the substrate mounting table in the embodiment.

FIG. 14 is a side view of the inclination adjusting means of the substrate mounting table in the embodiment.

FIG. 15 is a perspective view of a transfer unit in the embodiment.

FIG. 16 is a perspective view of a parallelism detecting unit in the embodiment.

FIG. 17 is a perspective view of a displacement detecting unit in the embodiment.

FIGS. 18A and 18B show a jig plate in the displacement detecting means of the embodiment, FIG. 18A is a plan view of a lower jig plate, and FIG. 18B is a bottom view of an upper jig plate.

FIGS. 19A and 19B show a state in which an upper jig plate is placed on a lower jig plate in the displacement detecting means of the embodiment, wherein FIG. 19A is a longitudinal sectional view and FIG.

FIG. 20 is a perspective view showing carry-in / transfer means and carry-out / transfer means in the embodiment.

FIG. 21 is an explanatory diagram of a step of sucking an IC component at a supply position in the embodiment.

FIG. 22 is an explanatory diagram of a step of measuring the inclination of the mounting position of the board in the example.

23A and 23B are explanatory diagrams of a state at the time of heating mounting, wherein FIG. 23A is an explanatory diagram of a conventional state for comparison, and FIG. 23B is an explanatory diagram of a state in the embodiment.

FIG. 24 is a vertical cross-sectional view of the mounted state of the IC component on the board in the embodiment.

FIG. 25 is a perspective view showing the state.

FIG. 26 is an explanatory diagram of a flow file of pressurization and heating at the time of mounting in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 IC component supply means 2 IC component adsorption | suction reversal conveyance means 3 Substrate setting table 5 Mounting head 6 Component recognition means 21 Tray 22 Tray plate 25 Extraction means 32 Moving body 35 Suction nozzle 36 Height detection sensor 37 Recognition camera 41 Tool 41a IC component Suction surface 41b Mounting surface 43 Substrate recognition camera 48 Pressurizing cylinder 52 Pressure detection sensor 57 Cooling jacket 60 Heat transfer regulation small cross section 61 Tool mounting part 62 Tool contact surface 66 Tool suction hole 68 Heater 69 Tool mounting part temperature detecting means Reference Signs List 80 tool suction surface temperature detecting means 86 first reference side regulating means 87 second reference side regulating means 88 movable side regulating means 89 movable side regulating means 98 fixed guide roller 99 pressing guide roller 102 height adjusting means B board P IC parts

 ──────────────────────────────────────────────────の Continued on the front page (72) Keiji Saeki 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Norihisa Watanabe 1006 Kadoma, Kazuma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference)

Claims (3)

[Claims] An IC component is picked up by a mounting head, a position of the IC component sucked by the mounting head is recognized, a reference position of the position-controlled board or an IC component mounting position is recognized, and the IC component is picked up on the board. An IC component mounting method for positioning and mounting at an IC component mounting position, wherein the IC component is heated at the time of mounting the IC component and the restriction on the position of the substrate is released. 2. An IC component supply means for supplying an IC component, a board installation table for regulating and holding a board on which the IC component is mounted, and a suction module for sucking the supplied IC component to a position where the IC component is mounted on the board. A mounting head including a tool to be mounted and a board recognizing means for recognizing an image of a reference position or an IC component mounting position of the board, a heating means of the tool provided on the mounting head, and recognizing a position of a component adsorbed by the tool. In the IC component mounting apparatus provided with a component recognizing means, the reference side regulating means for engaging with the side edge of the board and regulating the position is provided on two adjacent sides of the four sides of the board installation table. 2
Movable regulating means for pressing the board against the reference regulating means is provided on the side, and means for retreating the reference regulating means to the restriction releasing position are provided. An IC component mounting apparatus, wherein the reference-side restricting means is retracted to a restriction releasing position when mounting the IC component mounting apparatus. 3. A means for retracting the movable-side restricting means to the restriction releasing position, wherein when the IC component is mounted on the substrate with a heated tool, the movable-side restricting means is released together with the reference-side restricting means. 3. Retreating to a position
The IC component mounting apparatus according to any one of the preceding claims.