KR101157157B1 - Unit for aligning printed circuit board and chip mounter having the same - Google Patents

Abstract

 The present invention provides a printed circuit board aligning unit. The printed circuit board aligning unit includes a transfer unit for supporting the plurality of areas of the printed circuit board along the longitudinal direction of the printed circuit board having the alignment marks to transfer the printed circuit board, And a control unit controlling the conveyance unit to be conveyed in different directions in a plurality of areas of the printed circuit board. The present invention also provides a surface mounting apparatus having the above-described printed circuit board aligning unit. Therefore, according to the present invention, it is possible to align the printed circuit board at a component mounting position by correcting the degree of misalignment before and after the alignment, and to mount the components on the printed circuit board in a correct position.

Printed circuit board, distortion, correction, alignment

Description

Technical Field [0001] The present invention relates to a printed circuit board aligning unit and a surface mounting apparatus having the same,

1 is a perspective view showing a conventional surface mounting apparatus.

2 is a perspective view showing a printed circuit board aligning unit and a surface mounting apparatus having the same according to the present invention.

3 is a perspective view showing an operation state of a printed circuit board aligning unit according to the present invention.

4A is a plan view showing that the alignment coordinates of the printed circuit board are recognized by the vision unit according to the present invention with the circuit board misaligned.

4B is a plan view showing that the alignment coordinates of the printed circuit board are recognized by the vision unit according to the present invention in a state where the circuit board is aligned.

5 is a block diagram showing a printed circuit board aligning unit of the present invention.

6 is a flowchart showing a method of aligning a printed circuit board of a printed circuit board aligning unit of the present invention.

DESCRIPTION OF REFERENCE NUMERALS

10: align mark

50: PRINTED CIRCUIT BOARD (PCB)

70:

71: Guide

100:

110: 1st feed belt

111: first roller

120: 2nd feed belt

121: second roller

131: first drive motor

132: second drive motor

200: back-up table

300: Nozzle

400:

500: vision part

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount apparatus, and more particularly, to a surface mount apparatus that aligns a printed circuit board after correction of the degree of deflection of a printed circuit board at a component mounting position, mount unit and a surface mounting apparatus having the same.

Generally, semiconductor devices are fabricated by repeatedly or sequentially performing a number of unit processes such as diffusion, deposition, exposure, etching, ion implantation, and cleaning processes. The semiconductor devices thus manufactured are arranged in a plurality of alignment on the wafer. A plurality of semiconductor elements arranged on the wafer are individually drawn out and made into a semiconductor chip.

The semiconductor chips thus manufactured are mounted on the printed circuit board through the surface mounting apparatus at the component mounting position.

1 is a perspective view showing a conventional surface mounting apparatus.

Referring to FIG. 1, a conventional surface mounting apparatus includes a circuit board transferring unit for transferring semiconductor chips sequentially, a circuit board transferring unit for transferring the printed circuit board to a component mounting position, and a semiconductor And a head unit (not shown) which draws a chip and places it on the printed circuit board 50 and mounts the chip on the printed circuit board 50 at a component mounting position.

Therefore, the semiconductor chip must be mounted on the printed circuit board 50 at the correct component mounting position.

Accordingly, the conventional surface mounting apparatus has a separate printed circuit board aligning unit for aligning the printed circuit board 50 at the component mounting position.

A conventional printed circuit board aligning unit includes a conveying belt 90 for supporting both side bottom surfaces of a printed circuit board 50 to convey the printed circuit board 50 to a component mounting position, A drive motor 95 for driving the rollers 91 and an edge fixer 95 for pushing the side surface of the printed circuit board 50 at the component mounting position 80).

The edge picker 80 uses a single-acting cylinder, and the single-acting cylinder has a cylinder axis 81 for generating a displacement in the horizontal direction.

The operation of the conventional printed circuit board aligning unit having the above structure will be described.

Referring to Fig. 1, the printed circuit board 50 is seated on the feed belt 90 so that its bottom side surfaces are in contact with the upper surface of the feed belt 90. The driving motor 95 drives the rollers 91. [ As the rollers 91 are driven, the feed belt 90 is horizontally moved. Thus, the printed circuit board 50 mounted on the upper surface of the transfer belt 90 is transferred to the component mounting position. The conveying belt 90 having the printed circuit board 50 transferred to the component mounting position can be stopped by the stopping operation of the driving motor 95.

At this time, the edge fixer 80 aligns the printed circuit board 50 by applying a constant force to the side portions of the printed circuit board 50 transferred to the component mounting position. That is, since the edge picker 80 is constituted by a single-acting cylinder, the cylinder shaft 81 of the single-acting cylinder is drawn out to a predetermined length and a displacement in the horizontal direction is generated.

Therefore, the printed circuit board 50 can be aligned by contacting one end of the cylinder shaft 81 where the displacement is generated.

However, since the cylinder shaft 81 is displaced along the horizontal direction to momentarily push the side surface of the printed circuit board 50 to align the printed circuit board 50, It is often difficult to align properly.

Therefore, when the semiconductor chips are mounted on the printed circuit board 50 whose alignment is not normally performed, there is a problem that the semiconductor chips are mounted at the mounting position.

Meanwhile, in the case of arranging the single-acting cylinder in a plurality of the single-acting cylinders, the printed circuit board 50 is aligned by operating the respective cylinder shafts 81, Is increased.

On the other hand, since the edge picker 80 uses a separate single-acting cylinder, its structural configuration is complicated, and the number of parts required for the edge picker 80 increases.

SUMMARY OF THE INVENTION Accordingly, it is a primary object of the present invention to provide a printed circuit board aligning unit capable of aligning a printed circuit .

A second object of the present invention is to provide an aligning unit and a surface mounting apparatus having the same, which can reduce the time required for aligning a printed circuit board.

A third object of the present invention is to provide an aligning unit and a surface mounting apparatus having the same, which can reduce the manufacturing cost by simplifying the mechanical structure for aligning the printed circuit board.

The present invention provides a printed circuit board aligning unit for achieving the above object.

The printed circuit board aligning unit includes a transfer unit for supporting the plurality of areas of the printed circuit board along the longitudinal direction of the printed circuit board having the alignment marks to transfer the printed circuit board, And a control unit for controlling the conveyance unit to be conveyed in different directions in a plurality of areas of the PCB.

The conveying unit includes a first conveying belt that supports the bottom surface of one side of the printed circuit board and first rollers are disposed at both ends of the first conveying belt, a second conveying belt that supports the bottom surface of the other side of the printed circuit board, And a second drive motor that receives signals from the control unit and drives the first rollers and a second drive motor that receives the signals from the control unit and drives the second rollers Do.

The control unit is electrically connected to a vision unit that recognizes the alignment coordinates of the alignment marks, compares the alignment coordinates recognized from the vision unit with preset alignment coordinates, The correction value of the deflection of the printed circuit board is calculated so that the coordinate value of the printed circuit board becomes the predetermined coordinate value.

It is preferable that the controller drives the first driving motor and the second driving motor in accordance with the correction value of the deflection of the printed circuit board to make the feeding directions of the first feeding belt and the second feeding belt different from each other Do.

In addition, it is preferable that a stopper is further provided in the vicinity of the conveyance portion for contacting the conveyed printed circuit board to stop the printed circuit board.

The present invention provides a surface mounting apparatus having a printed circuit board aligning unit to achieve the above object.

The surface mount apparatus includes a main body having a guide having a predetermined length, and a plurality of regions of the printed circuit board, which are disposed on the guide and support a plurality of regions of the printed circuit board along a longitudinal direction of the printed circuit board having the alignment marks, A backup table which is located at the bottom of the transfer unit and fixes the transferred printed circuit board, and a backup table which is located in the vicinity of the transfer unit and which mounts the electronic parts on the transferred printed circuit board And a control unit for controlling the transport unit to be transported in different directions in a plurality of areas of the printed circuit board along the longitudinal direction of the supported printed circuit board.

The conveying unit includes a first conveying belt that supports the bottom surface of one side of the printed circuit board and first rollers are disposed at both ends of the first conveying belt, a second conveying belt that supports the bottom surface of the other side of the printed circuit board, And a second drive motor that receives signals from the control unit and drives the first rollers and a second drive motor that receives the signals from the control unit and drives the second rollers Do.

The control unit is electrically connected to a vision unit for recognizing the alignment coordinates of the alignment marks, compares the alignment coordinates recognized from the vision unit with preset alignment coordinates, The correction value of the deflection of the printed circuit board is calculated so that the coordinate value of the printed circuit board becomes the predetermined coordinate value.

It is preferable that the controller drives the first driving motor and the second driving motor in accordance with the correction value of the deflection of the printed circuit board to make the feeding directions of the first feeding belt and the second feeding belt different from each other Do.

In addition, it is preferable that a stopper is further provided in the vicinity of the conveyance portion for contacting the conveyed printed circuit board to stop the printed circuit board.

Hereinafter, a printed circuit board aligning unit and a surface mounting apparatus having the same according to the embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the surface mount apparatus of the present invention will be described, and the printed circuit board aligning unit will be described.

2 is a perspective view showing a printed circuit board aligning unit and a surface mounting apparatus having the same according to the present invention. 3 is a perspective view showing an operation state of a printed circuit board aligning unit according to the present invention. 4A is a plan view showing that the alignment coordinates of the printed circuit board are recognized by the vision unit according to the present invention with the circuit board misaligned. 4B is a plan view showing that the alignment coordinates of the printed circuit board are recognized by the vision unit according to the present invention in a state where the circuit board is aligned. 5 is a block diagram showing a printed circuit board aligning unit of the present invention. 6 is a flowchart showing a method of aligning a printed circuit board of a printed circuit board aligning unit of the present invention.

2 and 5, the surface mounting apparatus of the present invention has a main body 70 provided with a guide 71 having a constant width. The main body 70 has a transfer unit 100 for transferring the printed circuit board 50 from the inside of the guide 71 to an alignment position.

The transfer unit 100 supports the plurality of areas of the printed circuit board 50 along the longitudinal direction of the printed circuit board 50 having the alignment marks 10 to transfer the printed circuit board 50 .

The main body 70 has a vision unit 500 for recognizing the alignment mark 10 and recognizing the alignment coordinates X1, Y1 (X2, Y2).

The main body 70 has a control unit 400 for aligning the PCB 50 transferred to the alignment position through the transfer unit 100.

Here, the PCB alignment unit of the present invention has the transfer unit 100 and the control unit 400.

The configuration of the transfer unit 100 will be described in more detail.

The conveyance unit 100 includes a pair of conveyance belts 110 and 120 located on both sides of the guide 71 and drive motors 131 and 132 for driving the conveyance belts 110 and 120. The pair of conveying belts 110 and 120 may support both side bottom regions of the printed circuit board 50 and transfer the printed circuit board 50 along the lengthwise direction of the printed circuit board 50.

The conveying belts 110 and 120 are disposed at one side of the inside of the guide 71 and include a first conveying belt 110 for supporting a bottom surface of one side of the printed circuit board 50, A second conveying belt 120 located on the other side of the first conveying belt 110 and supporting the bottom surface of the other side of the printed circuit board 50 and first rollers 120 laid on both ends of the first conveying belt 110, A first driving motor 131 for driving the first rollers 111 and a second driving motor 121 for driving the first and second rollers 111 and 121. The first and second rollers 121 and 121, And a second drive motor 132 for driving the rollers 121. [ The first driving motor 131 and the second driving motor 132 may be electrically connected to the controller 400.

The vision unit 500 may be positioned above the conveyance path of the printed circuit board 50. The vision unit 500 may be electrically connected to the controller 400. The vision unit 500 may be a camera. The camera can recognize the alignment coordinate values X1, Y1 (X2, Y2) of the alignment marks 10 formed on the printed circuit board 50 to be transferred. The vision unit 500 may transmit the alignment coordinate values X1 and Y1 (X2 and Y2) to the controller 400. FIG.

The control unit 400 may set the reference coordinate values Xo1, Yo1 (Xo2, Yo2). The reference coordinate values Xo1, Yo1 (Xo2, Yo2) may be the case where the printed circuit board 50 transferred from the guide 71 is properly aligned. The normally aligned position may be a case where the reference coordinate values Xo1, Yo1 (Xo2, Yo2) are equal to the recognized aligned coordinate values (X1, Y1) (X2, Y2).

The control unit 400 controls the conveyance unit 100 so that the recognized alignment coordinate values X1 and Y1 (X2 and Y2) become equal to the reference alignment coordinate values Xo1 and Yo1 (Xo2 and Yo2) Can be driven. The control unit 400 transmits driving signals to the first and second driving motors 131 and 132 so that the driving directions of the first and second conveyance belts 110 and 120 are reversed can do.

In addition, the main body 70 has a nozzle 300. The nozzle 300 may be positioned above the alignment position. The nozzle 300 may be moved up and down and horizontally by a driving device not shown in the drawing. The nozzle 300 can adsorb the electronic component, and the adsorbed electronic component can be mounted on the printed circuit board 50 aligned at the alignment position. Of course, the driving device of the nozzle 300 may be electrically connected to the controller 400, and may be driven in accordance with an electrical signal transmitted from the controller 400.

Hereinafter, the functions and effects of the above-described printed circuit board aligning unit and the surface mounting apparatus having the same will be described.

Referring to FIG. 2, the printed circuit board 50 on which electronic parts are not mounted can be stood in a state in which both side bottom surfaces thereof are supported on the upper surfaces of the first and second conveyance belts 110 and 120.

Referring to FIGS. 3 and 6, the printed circuit board (PCB) is transferred to the aligned position (S110).

That is, the control unit 400 transmits the driving signals to the first and second driving motors 131 and 132, and the first and second driving motors 131 and 132 rotate the first and second rollers 111 and 121 in the same direction . As the first and second rollers 111 and 121 roll in the same direction and at the same rotational speed, the first and second transport belts 110 and 120 can travel in one direction. Thus, the printed circuit boards 50 supported on their upper surfaces are transported along their running directions.

Then, the printed circuit board 50 can be stopped according to the stopping operation of the first and second conveyance belts 110 and 120 in the aligned position. The printed circuit board 50 may be stopped while being contacted with one end of a stopper S installed to be rotated by the guide 71 while being transported. The control unit 400 stops the driving of the first and second driving motors 131 and 132 when the printed circuit board 50 contacts the one end of the stopper S, It can also be stopped.

Next, the alignment coordinates of the printed circuit board are recognized (S120).

4A and 4B, the vision unit 500 can recognize the alignment marks 10 formed on the upper surface of the printed circuit board 50 to be transferred to the alignment position. The vision unit 500 can recognize the aligned coordinate values X1, Y1 (X2, Y2) according to the recognized alignment marks 10. [ The vision unit 500 may transmit the recognized alignment coordinate values X1, Y1 (X2, Y2) to the controller 400. FIG.

The controller 400 may compare the recognized alignment coordinate values X1 and Y1 and the reference alignment coordinate values Xo1 and Yo1 Xo2 and Yo2 with each other. The recognized aligned coordinate values (X1, Y1) (X2, Y2) and predetermined reference aligned coordinate values (Xo1, Yo1) (Xo2, Yo2) are illustrated in FIG.

Then, the controller 400 determines that the recognized alignment coordinate values X1, Y1 (X2, Y2) are equal to the reference alignment coordinate values Xo1, Yo1 (Xo2, Yo2) The correction coordinate values? X and? Y, which are correction values, can be calculated (S200).

The controller 400 determines whether the recognized aligned coordinate values X1, Y1 (X2, Y2) are equal to the reference aligned coordinate values Xo1, X2 based on the corrected coordinate values? X, Yo1) (Xo2, Yo2) of the transfer unit 100. In this case,

That is, the control unit 400 controls the operation of the conveyance unit 100 so as to correct the deviation of the printed circuit board 50, thereby reversing the conveyance direction of the first and second conveyance belts 110 and 120 S210).

More specifically, the controller 400 may transmit driving signals to the first and second driving motors 131 and 132, respectively. The driving signal may be an electrical signal for driving the first and second conveyance belts 110 and 120 to travel in a reverse direction.

The first driving motor 131 receiving the electrical signal from the controller 400 rotates the first rollers 111 at a predetermined speed and rotates the first rollers 111, The running direction of the vehicle 110 is made to run in the arrow direction as shown in FIG.

The second driving motor 132 receives an electrical signal from the controller 400 and rotates the second rollers 121 at a predetermined speed in a direction opposite to the rotating direction of the first rollers 111, The running direction of the second feeding belt 120 having both ends thereof straddled by the second rollers 121 is made to run in the leftward direction of the arrow in the reverse direction of the arrow right direction as shown in FIG.

Therefore, the traveling direction of the first and second transport belts 110 and 120 is reversed, and the traveling speed of the belts 110 and 120 is preferably constant. Of course, the control unit 400 may control the first and second driving motors 131 and 132 to vary the traveling speed of the first and second conveyance belts 110 and 120, or may be different from each other.

4B, when the recognized alignment coordinate values X1, Y1 (X2, Y2) are equal to the reference alignment coordinate values Xo1, Yo1) (Xo2, Yo2) (S230).

4B, the controller 400 determines whether the recognized alignment coordinate values X1, Y1 (X2, Y2) are equal to the reference alignment coordinate values Xo1, Yo1 (Xo2, Yo2, the operation of the conveyance unit 100 can be stopped.

Thus, the printed circuit board 50 can be aligned at an aligned position. At this time, the printed circuit board 50 may be fixed by the backup table 200 at an aligned position.

When the alignment of the printed circuit board 50 is completed at the alignment position, the nozzle 300 may be lowered to mount a predetermined electronic component of the printed circuit board 50 (S300). The nozzle 50 may be re-mounted after returning to the original position after mounting other predetermined electronic components on the printed circuit board 50.

Then, the control unit 400 can release the stopper S from the printed circuit board 50 by rotating it.

Then, the control unit 400 can operate the conveyance unit 100 again. At this time, the control unit 400 may form the traveling direction of the first and second conveyance belts 110 and 120 in the same direction through the first and second driving motors 131 and 132. At this time, the running direction of the belts 110 and 120 follows the direction in which the printed circuit board 50 is taken out

Accordingly, the printed circuit board 50 on which the electronic components are mounted is supported by the first and second conveyance belts 110 and 120 at both side portions thereof, and is conveyed to a predetermined position. And can be drawn out to the outside (S310).

As described above, the present invention has the effect of aligning the printed circuit boards by supporting the opposite side bottoms of the printed circuit board and orienting the conveying belts for conveying in opposite directions.

In addition, since the present invention controls the traveling direction of the conveyance belts to align the printed circuit board, it is possible to efficiently reduce the time required for aligning the printed circuit boards, Effect.

Further, since the present invention controls only the traveling direction of the conveyance belts, it is possible to simplify the mechanical structure for aligning the printed circuit board, thereby effectively lowering the manufacturing cost of the electronic product.

Claims (10)

A transferring part for supporting the plurality of areas of the printed circuit board along the longitudinal direction of the printed circuit board having alignment marks and transferring the printed circuit board; And The control unit controls the both ends of the conveyance unit to run in opposite directions in accordance with the deformation of the printed circuit board that is conveyed along the conveyance unit in a plurality of areas of the printed circuit board along the longitudinal direction of the supported printed circuit board, And a control unit for correcting the deviation. The method according to claim 1, Wherein the conveying portion includes a first conveying belt for supporting a bottom surface of one side of the printed circuit board and first rollers laid on both ends of the first conveying belt and a second conveying belt for supporting a bottom surface of the other side of the printed circuit board, A second drive motor for receiving signals from the control unit and driving the first rollers and a second drive motor for receiving the signals from the control unit and driving the second rollers, Printed circuit board alignment unit. 3. The method of claim 2, The control unit is electrically connected to a vision unit that recognizes the alignment coordinates of the alignment marks, And compares an alignment coordinate value recognized from the vision unit with a preset alignment coordinate value to calculate a distortion correction value of the printed circuit board so that the recognized alignment coordinate value becomes a predetermined alignment coordinate value A printed circuit board alignment unit. The method of claim 3, Wherein the controller corrects the error correction value of the printed circuit board, Wherein the first driving motor and the second driving motor are driven to make the feeding directions of the first feeding belt and the second feeding belt different from each other. The method according to claim 1, Wherein a stopper is further provided in the vicinity of the conveying portion for contacting the conveyed printed circuit board to stop the printed circuit board. A body provided with a guide having a predetermined length; A transfer unit disposed in the guide and supporting a plurality of regions of the printed circuit board along a longitudinal direction of the printed circuit board having alignment marks to transfer the printed circuit board to a predetermined position; A back-up table positioned at a bottom of the conveying unit and fixing the conveyed printed circuit board; A nozzle positioned in the vicinity of the conveyance unit for mounting an electronic component on the conveyed printed circuit board; And The control unit controls the both ends of the conveyance unit to run in opposite directions in accordance with the deformation of the printed circuit board that is conveyed along the conveyance unit in a plurality of areas of the printed circuit board along the longitudinal direction of the supported printed circuit board, And a control unit for correcting the deviation. The method according to claim 6, Wherein the conveying portion includes a first conveying belt for supporting a bottom surface of one side of the printed circuit board and first rollers laid on both ends of the first conveying belt and a second conveying belt for supporting a bottom surface of the other side of the printed circuit board, A second drive motor for receiving signals from the control unit and driving the first rollers and a second drive motor for receiving the signals from the control unit and driving the second rollers, A surface mount apparatus having a printed circuit board alignment unit. 8. The method of claim 7, The control unit is electrically connected to a vision unit that recognizes the alignment coordinates of the alignment marks, And compares the alignment coordinate value recognized from the vision unit with a predetermined alignment coordinate value to calculate a correction value for correction of the printing circuit board so that the recognized alignment coordinate value becomes a predetermined alignment coordinate value And a printed circuit board aligning unit. 9. The method of claim 8, Wherein the controller corrects the error correction value of the printed circuit board, Wherein the first driving motor and the second driving motor are driven to make the conveying directions of the first conveying belt and the second conveying belt different from each other. The method according to claim 6, Wherein a stopper is further provided in the vicinity of the conveying portion for stopping the printed circuit board in contact with the conveyed printed circuit board.

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