WO2015033402A1

WO2015033402A1 - Screen printer

Info

Publication number: WO2015033402A1
Application number: PCT/JP2013/073802
Authority: WO
Inventors: 毅近藤
Original assignee: 富士機械製造株式会社
Priority date: 2013-09-04
Filing date: 2013-09-04
Publication date: 2015-03-12
Also published as: JPWO2015033402A1; JP6307086B2

Abstract

This specification discloses a screen printer provided with the following: a screen mask; a circuit-board raising/lowering mechanism that holds a circuit board and moves said circuit board upwards toward the screen mask; and a stage-driving mechanism that makes a stage contact the top surface of the screen mask and move along said screen mask. This screen printer is also provided with the following: a circuit-board imaging device that is capable of moving within a horizontal plane and images a recognition mark on the circuit board from above said circuit board; a circuit-board measurement device that is capable of moving together with the circuit-board imaging device and acquires geometry data for the top surface of the circuit board; and a control device that controls the operation of the circuit-board raising/lowering mechanism and the stage-driving mechanism. The control device in this screen printer controls the operation of the circuit-board raising/lowering mechanism and/or the stage-driving mechanism on the basis of the circuit-board top-surface geometry data acquired by the circuit-board measurement device.

Description

Screen printing machine

This specification relates to a screen printer.

Japanese Patent Laid-Open No. 2012-158129 discloses a screen mask, a circuit board lifting / lowering mechanism that holds the circuit board and lifts it toward the screen mask, and moves the squeegee along the screen mask while abutting on the upper surface of the screen mask. A screen printing machine having a squeegee drive mechanism is disclosed. The screen printing machine includes a circuit board measuring device that acquires shape data of the upper surface of the circuit board, and a control device that controls the operation of the circuit board lifting mechanism. In this screen printing machine, the holding position of the circuit board by the circuit board lifting mechanism is adjusted based on the shape data of the upper surface of the circuit board acquired by the circuit board measuring device.

In the technique disclosed in Japanese Patent Application Laid-Open No. 2012-158129, in order to acquire shape data of the upper surface of the circuit board, the circuit board is moved below the circuit board measuring apparatus, and then the circuit board measuring apparatus is moved. Since the distance is measured by scanning the upper surface of the circuit board, the tact time of the screen printer is long. A technology that can further reduce the tact time of a screen printing machine is expected.

This specification discloses a technique for solving the above problems. The present specification provides a technique capable of further reducing the tact time in a screen printing machine that controls the operation of a circuit board lifting mechanism and a squeegee driving mechanism based on shape data of the upper surface of a circuit board.

The present specification includes a screen mask, a circuit board lifting mechanism that holds the circuit board and lifts the circuit board toward the screen mask, and a squeegee driving mechanism that moves the squeegee along the screen mask while abutting the upper surface of the screen mask. Disclosed is a screen printer. The screen printing machine is movable in a horizontal plane, and is capable of moving integrally with the circuit board imaging device that images the recognition mark of the circuit board from above the circuit board, and the upper surface of the circuit board. A circuit board measuring device that acquires the shape data of the circuit board, and a control device that controls the operation of the circuit board lifting mechanism and the squeegee driving mechanism. In the screen printing machine, the control device controls the operation of the circuit board lifting mechanism and / or the squeegee driving mechanism based on the shape data of the upper surface of the circuit board acquired by the circuit board measuring device.

Generally, a screen printing machine includes a circuit board imaging device that images a recognition mark provided on a circuit board in order to align the screen mask and the circuit board. In the screen printing machine disclosed in this specification, a circuit board imaging device that images a recognition mark on a circuit board from above the circuit board and a circuit board measurement device that acquires shape data of the upper surface of the circuit board are integrated in a horizontal direction. It is possible to move. With such a configuration, the shape data of the upper surface of the circuit board can be acquired in parallel with the operation of imaging the recognition mark on the circuit board. According to the screen printing machine, the tact time can be shortened.

The above-described screen printing machine is movable in a horizontal plane, and can be moved integrally with the screen mask imaging device that images the recognition mark of the screen mask from below the screen mask. The apparatus further includes a screen mask measuring device that acquires the shape data of the lower surface, and the control device acquires the shape data of the upper surface of the circuit board acquired by the circuit board measuring device and the lower surface of the screen mask acquired by the screen mask measuring device. On the basis of the shape data, the operation of the circuit board lifting mechanism and / or the squeegee driving mechanism can be controlled.

Many screen printing machines also include a screen mask imaging device for imaging the recognition mark of the screen mask in addition to the circuit board imaging device for imaging the recognition mark of the circuit board for alignment of the screen mask and the circuit board. Yes. In the screen printing machine disclosed in this specification, a screen mask imaging device that captures a screen mask recognition mark from below the screen mask and a screen mask measurement device that acquires shape data of the lower surface of the screen mask are integrated in the horizontal direction. It is possible to move. With such a configuration, the above-described screen printing machine can perform a printing operation in consideration of not only the flexure of the circuit board but also the flexure of the screen mask. Further, according to the above-described screen printing machine, the shape data of the lower surface of the screen mask can be acquired in parallel with the operation of imaging the recognition mark of the screen mask, and the tact time can be shortened.

The above-described screen printing machine can be configured such that the circuit board imaging device, the circuit board measuring device, the screen mask imaging device, and the screen mask measuring device are held by the same moving mechanism.

According to the screen printing machine, the moving mechanism for moving the circuit board imaging device and the circuit board measuring device in the horizontal plane, and the moving mechanism for moving the screen mask imaging device and the screen mask measuring device in the horizontal plane are provided. By making them common, it is possible to reduce the number of parts and save space.

In the screen printing machine, the control device moves up and down the circuit board based on the shape data of the upper surface of the circuit board acquired by the circuit board measuring device and the shape data of the lower surface of the screen mask acquired by the screen mask measuring device. It can comprise so that the raising amount of the circuit board by a mechanism may be adjusted.

According to the above-described screen printing machine, it is possible to control the operation of the circuit board lifting mechanism so that the circuit board and the screen mask are in close contact with each other in consideration of the bending of the circuit board and the bending of the screen mask.

The screen printing machine is configured such that the control device sets the distance from the upper surface of the circuit board to the lower surface of the screen mask in the vicinity of the edge of the circuit board as the amount of the circuit board raised by the circuit board lifting mechanism. be able to. Alternatively, in the screen printing machine, the control device sets the distance from the upper surface of the circuit board to the lower surface of the screen mask in the vicinity of the center portion of the circuit board as the amount of rise of the circuit board by the circuit board lifting mechanism. Can be configured. Alternatively, the screen printing machine can be configured such that the control device sets the minimum value of the distance from the upper surface of the circuit board to the lower surface of the screen mask as the amount of rise of the circuit board by the circuit board lifting mechanism. . Alternatively, the screen printing machine described above can be configured such that the control device sets the maximum value of the distance from the upper surface of the circuit board to the lower surface of the screen mask to the rising amount of the circuit board by the circuit board lifting mechanism. .

The side view which shows typically the structure of the screen printer 2 of an Example. The top view which shows typically the structure of the circuit board positioning device 24 in the screen printer 2 of an Example. The top view which shows typically the structure of the screen mask 28 and the squeegee apparatus 30 in the screen printer 2 of an Example. The figure which looked at the screen mask 28 in the screen printer 2 of an Example from the downward direction. The figure which shows the example of the bending method of the screen mask 28 and the circuit board C in the screen printer 2 of an Example. The figure which shows another example of the bending method of the screen mask 28 and the circuit board C in the screen printer 2 of an Example. The side view which shows typically the structure of the modification of the screen printer 2 of an Example.

(Example)
Hereinafter, the screen printer 2 of the embodiment will be described with reference to the drawings. As shown in FIG. 1, the screen printing machine 2 mainly includes a control device 20, an interface device 22, a circuit board positioning device 24, an imaging measurement device 26, a screen mask 28, and a squeegee device 30. Yes. The screen printing machine 2 receives the circuit board C from the upstream side of the mounting line, screen-prints a desired pattern of solder on the circuit board C, and then sends the circuit board C to the downstream side of the mounting line. In the following description, in the screen printing machine 2, the transport direction of the circuit board C is the X direction, the direction orthogonal to the X direction in the horizontal plane is the Y direction, and the direction orthogonal to the X direction and the Y direction is the Z direction. And

The control device 20 can communicate with a production management computer (not shown) that manages the overall operation of the mounting line. The control device 20 controls the operation of each component of the screen printing machine 2 in accordance with an instruction from the production management computer. In addition, the control device 20 transmits data indicating the state of solder printing work in the screen printer 2 to the production management computer.

The interface device 22 presents the setting state and work state of the screen printing machine 2 to the worker via a monitor or the like, and accepts various inputs from the worker via a switch or the like.

The circuit board positioning device 24 includes a Y direction moving mechanism 40, an X direction moving mechanism 42, a rotating mechanism 44, an elevating mechanism 46, an X direction transport mechanism 48, a clamp mechanism 50, and a support mechanism 52. .

The Y-direction moving mechanism 40 is supported on the base of the screen printing machine 2. The Y-direction moving mechanism 40 can be moved relative to the base of the screen printing machine 2 in the Y direction by driving an actuator (not shown).

The X direction moving mechanism 42 is supported by the Y direction moving mechanism 40. The X-direction moving mechanism 42 can be moved relative to the Y-direction moving mechanism 40 in the X direction by driving an actuator (not shown).

The rotating mechanism 44 is supported by the X-direction moving mechanism 42. The rotation mechanism 44 can be rotated around the Z axis with respect to the X-direction movement mechanism 42 by driving a motor (not shown).

The elevating mechanism 46 is supported by the rotating mechanism 44. The lifting mechanism 46 can be moved relative to the rotating mechanism 44 in the Z direction by driving an actuator (not shown).

The X-direction transport mechanism 48, the clamp mechanism 50, and the support mechanism 52 are supported by the lifting mechanism 46. The X-direction transport mechanism 48 includes a pair of conveyor belts 54 arranged along the X direction and servo motors (not shown) that drive the respective conveyor belts 54. As shown in FIG. 2, the X-direction transport mechanism 48 places both ends of the circuit board C in the Y direction on a pair of conveyor belts 54, and drives the servo motor to move the circuit board C in the X direction. It can be transported. Depending on the size of the circuit board C, the distance between the pair of conveyor belts 54 can be adjusted.

As shown in FIG. 2, the clamp mechanism 50 can hold the circuit board C with a desired width by sandwiching the circuit board C from both ends in the Y direction. The support mechanism 52 can support the circuit board C from the lower surface side by bringing the tips of the support pins 56 into contact with the lower surface of the circuit board C held by the clamp mechanism 50.

The screen mask 28 is a metal plate-like member formed in a rectangular shape, and is supported on four sides by a mask support frame 66 whose position is fixed with respect to the base of the screen printing machine 2. In the central portion of the screen mask 28, an opening is formed corresponding to the solder pattern to be printed on the circuit board C. Hereinafter, the opening formed in the screen mask 28 is also referred to as a print pattern 28a.

As shown in FIG. 2, a recognition mark F is formed on the upper surface of the circuit board C. As shown in FIG. 4, a recognition mark 28 b is formed on the lower surface of the screen mask 28. In the screen printing machine 2, the circuit board C and the screen mask 28 are aligned based on the recognition mark F on the circuit board C and the recognition mark 28 b on the screen mask 28.

The imaging measuring device 26 includes an XY direction moving mechanism 60, a circuit board imaging device 62a, a screen mask imaging device 62b, a circuit board measuring device 64a, and a screen mask measuring device 64b. The XY direction moving mechanism 60 can be moved relative to the base of the screen printing machine 2 in the X direction and the Y direction by driving an actuator (not shown). The circuit board imaging device 62a, the screen mask imaging device 62b, the circuit board measuring device 64a, and the screen mask measuring device 64b are held by the XY direction moving mechanism 60.

The circuit board imaging device 62a includes illumination and a camera for imaging the circuit board C, and can image the upper surface of the circuit board C. The control device 20 can process the image data picked up by the circuit board imaging device 62a and specify the position of the recognition mark F on the circuit board C.

The screen mask imaging device 62b includes illumination and a camera for imaging the screen mask 28, and can image the lower surface of the screen mask 28. The control device 20 can process the image data captured by the screen mask imaging device 62b and specify the position of the recognition mark 28b of the screen mask 28.

The circuit board measuring device 64a is a laser length measuring device that measures the distance in the Z direction from the imaging measuring device 26 to the circuit board C. By moving the XY direction moving mechanism 60 in the XY direction and measuring the distance in the Z direction from the imaging measurement device 26 to the circuit board C by the circuit board measurement device 64a, the control device 20 allows the upper surface of the circuit board C to be measured. Shape data can be acquired.

The screen mask measuring device 64b is a laser length measuring device that measures the distance in the Z direction from the imaging measuring device 26 to the screen mask 28. By moving the XY direction moving mechanism 60 in the XY direction and measuring the distance in the Z direction from the imaging measuring device 26 to the screen mask 28 by the screen mask measuring device 64b, the control device 20 causes the lower surface of the screen mask 28 to move. Shape data can be acquired.

As shown in FIGS. 1 and 3, the squeegee device 30 includes a Y-direction moving mechanism 72, a squeegee head 74, and

squeegees

76a and 76b.

The Y-direction moving mechanism 72 is supported on the base of the screen printing machine 2. The Y-direction moving mechanism 72 can be moved relative to the base of the screen printing machine 2 in the Y direction by driving an actuator (not shown).

The squeegee head 74 is supported by the Y-direction moving mechanism 72. The squeegee head 74 can be moved relative to the Y-direction moving mechanism 72 in the Z direction by driving an actuator (not shown).

The

squeegees

76a and 76b are supported by the squeegee head 74. The

squeegees

76a and 76b can be tilted with respect to the squeegee head 74 by driving a servo motor (not shown). The

squeegees

76a and 76b squeeze the solder supplied to the upper surface of the screen mask 28 from a solder supply device (not shown) on the print pattern.

As shown in FIG. 2, the screen printing machine 2 further includes a receiving and conveying device 80 and a sending and conveying device 82. The receiving and conveying device 80 includes a pair of conveyor belts 84 arranged along the X direction, and servo motors (not shown) that drive the respective conveyor belts 84. The receiving and conveying device 80 receives the circuit board C sent from the substrate conveying device T1 on the upstream side of the screen printer 2, and sends the circuit board C to the X-direction conveying mechanism 48 of the circuit board positioning device 24. The delivery conveying device 82 includes a pair of conveyor belts 86 arranged along the X direction, and servo motors (not shown) that drive the respective conveyor belts 86. The sending / conveying device 82 receives the circuit board C sent from the X-direction carrying mechanism 48 of the circuit board positioning device 24, and sends it to the substrate carrying device T 2 on the downstream side of the screen printing machine 2. Similar to the pair of conveyor belts 54 of the X-direction transport mechanism 48, the distance between the pair of conveyor belts 84 of the receiving transport apparatus 80 and the distance between the pair of conveyor belts 86 of the delivery transport apparatus 82 are the size of the circuit board C to be transported. It can be adjusted according to.

The operation of the screen printer 2 will be described. When the circuit board C is sent from the upstream board transfer device T1, the control device 20 drives the receiving transfer device 80 to receive the circuit board C. Then, the control device 20 controls the Y-direction moving mechanism 40, the X-direction moving mechanism 42, the rotating mechanism 44, and the raising / lowering so that the X-direction conveying mechanism 48 is in a position where the circuit board C can be received from the receiving conveying device 80. The mechanism 46 is driven. Then, the control device 20 drives the receiving and conveying device 80 and the X-direction conveying mechanism 48 to deliver the circuit board C from the receiving and conveying device 80 to the X-direction conveying mechanism 48.

When the circuit board C is delivered to the X-direction transport mechanism 48, the control device 20 drives the X-direction transport mechanism 48 to transport the circuit board C to the X-direction position corresponding to the print pattern 28a of the screen mask 28. . Then, the control device 20 drives the clamp mechanism 50 and the support mechanism 52 to hold the circuit board C. Then, the control device 20 moves the XY direction moving mechanism 60 of the imaging measurement device 26 in the XY direction, images the upper surface of the circuit board C by the circuit board imaging device 62a, and the circuit board C by the circuit board measurement device 64a. The acquisition of the shape data of the upper surface, the imaging of the lower surface of the screen mask 28 by the screen mask imaging device 62b, and the acquisition of the shape data of the lower surface of the screen mask 28 by the screen mask measuring device 64b are performed.

The control device 20 processes the image data picked up by the circuit board image pickup device 62a to identify the position of the recognition mark F on the circuit board C, and also processes the image data picked up by the screen mask image pickup device 62b to obtain a screen. The position of the recognition mark 28b of the mask 28 is specified, and a positional deviation between the two is detected. When the positional deviation is detected, the control device 20 drives the Y-direction moving mechanism 40, the X-direction moving mechanism 42, and the rotating mechanism 44 to finely adjust the position of the circuit board C.

Further, the control device 20 uses the circuit board C based on the shape data of the upper surface of the circuit board C acquired by the circuit board measuring device 64a and the shape data of the lower surface of the screen mask 28 acquired by the screen mask measuring device 64b. Set the amount of increase. When the rising amount of the circuit board C is set, the control device 20 drives the elevating mechanism 46 to raise the circuit board C and bring the circuit board C into contact with the lower surface of the screen mask 28. The control device 20 connects the shape data of the upper surface of the circuit board C acquired by the circuit board measurement device 64a and the shape data of the lower surface of the screen mask 28 acquired by the screen mask measurement device 64b to the control device 20. May be sent to the production management computer.

The circuit board C and the screen mask 28 cannot maintain an ideal planar shape and have a deflection in the Z direction. Usually, the screen mask 28 is bent into a downwardly convex shape as shown in FIGS. The circuit board C may be bent into a convex shape as shown in FIG. 5 or may be bent into a convex shape as shown in FIG.

As shown in FIG. 5, when the circuit board C is bent into an upwardly convex shape, the control device 20 can detect the circuit board C from the lower surface of the screen mask 28 in the vicinity of the end of the circuit board C in the Y-axis direction. The distance L1 in the Z direction to the upper surface is calculated, and the calculated distance L1 is set as the rising amount of the circuit board C. In such a case, by raising the circuit board C by the distance L1, squeezing can be performed in a state where the entire surface of the circuit board C is in close contact with the screen mask 28.

As shown in FIG. 6, when the circuit board C is bent in a downwardly convex shape, the control device 20 is in the vicinity of the center of the circuit board C (in other words, at the position where the circuit board C is bent most downward). Then, the distance L2 in the Z direction from the lower surface of the screen mask 28 to the upper surface of the circuit board C is calculated, and the calculated distance L2 is set as the rising amount of the circuit board C. In such a case, the circuit board C can be brought into contact with the screen mask 28 while the screen mask 28 is loosened by raising the circuit board C by the distance L2. By pressing the screen mask 28 from above with the

squeegees

76a and 76b, squeezing can be performed with the circuit board C in close contact with the screen mask 28.

Alternatively, the rising amount of the circuit board C may be set regardless of whether the circuit board C is bent into a convex shape or bent downward. For example, the minimum value of the distance in the Z direction from the lower surface of the screen mask 28 to the upper surface of the circuit board C may be set as the rising amount of the circuit board C. In such a case, the adhesion degree of the entire circuit board C is lowered, and the circuit board C can be smoothly separated from the screen mask 28 after the solder printing. Alternatively, the maximum value of the distance in the Z direction from the lower surface of the screen mask 28 to the upper surface of the circuit board C may be set as the rising amount of the circuit board C. In such a case, the degree of adhesion of the entire circuit board C is increased, and high fillability in solder printing can be realized.

Alternatively, when the circuit board C is bent into a wavy shape, a location where the difficulty of the solder printing operation is high, that is, a location where defects are likely to occur in the solder printing operation is specified, and a screen mask at that location The distance in the Z direction from the lower surface of 28 to the upper surface of the circuit board C may be calculated, and the calculated distance may be set as the rising amount of the circuit board C. In such a case, the degree of adhesion between the screen mask 28 and the circuit board C at a location where the difficulty level of the solder printing work is high increases, and the occurrence of defects in the solder printing work can be suppressed.

The acquisition of the shape data of the upper surface of the circuit board C and the setting of the amount of increase of the circuit board C associated therewith may be performed for all the circuit boards C, or the production lot of the circuit board C is limited. It may be performed each time it changes, or may be performed every time the type of the circuit board C changes. The acquisition of the shape data of the lower surface of the screen mask 28 may be performed every time the screen mask 28 is replaced, or may be performed periodically (for example, every time a predetermined time elapses).

In parallel with the positioning of the circuit board C as described above, the control device 20 supplies solder to the upper surface of the screen mask 28 by a solder supply device (not shown). When the circuit board C comes into contact with the lower surface of the screen mask 28 and solder is supplied to the upper surface of the screen mask 28, the control device 20 drives the squeegee head 74 so that one of the squeegees (for example, the squeegee 76a) is moved to the screen mask. After making contact with the upper surface of 28, the Y-direction moving mechanism 72 is driven to perform squeezing on the print pattern 28a of the screen mask 28. As a result, the solder is printed in a pattern corresponding to the print pattern 28 a on the circuit board C held in contact with the lower surface of the screen mask 28.

When the solder printing on the circuit board C is completed, the control device 20 drives the Y-direction moving mechanism 72 and the squeegee head 74 to return the squeegee device 30 to the standby position. In addition, the control device 20 drives the lifting mechanism 46, the clamp mechanism 50, and the support mechanism 52 to transfer the circuit board C to the X-direction transport mechanism 48 again. Further, the control device 20 sets the Y-direction moving mechanism 40, the X-direction moving mechanism 42, and the rotating mechanism 44 so that the X-direction conveying mechanism 48 is at a position where the circuit board C can be delivered to the delivery conveying device 82. To drive.

Then, the control device 20 drives the X-direction transport mechanism 48 and the send-out transport device 82 to deliver the circuit board C from the X-direction transport mechanism 48 to the send-out transport device 82. Thereafter, the control device 20 drives the delivery / conveyance device 82 to deliver the circuit board C to the downstream substrate conveyance device T2.

As described above, in the screen printing machine 2 of this embodiment, the circuit board measuring device 64a is held by the XY direction moving mechanism 60 that holds the circuit board imaging device 62a. By adopting such a configuration, the shape data of the upper surface of the circuit board C can be acquired in parallel with the imaging operation of the recognition mark F of the circuit board C, and the tact time of the screen printing machine 2 can be shortened. it can. In the screen printing machine 2 of the present embodiment, the screen mask measuring device 64b is held by the XY direction moving mechanism 60 that holds the screen mask imaging device 62b. With such a configuration, the shape data of the lower surface of the screen mask 28 can be acquired in parallel with the recognition operation of the recognition mark 28b of the screen mask 28, and the tact time of the screen printing machine 2 can be shortened. it can.

Note that the shape data of the upper surface of the circuit board C acquired by the circuit board measuring device 64a and / or the shape data of the lower surface of the screen mask 28 acquired by the screen mask measuring device 64b specify the rising amount of the circuit board C. It can also be used for other purposes. For example, as shown in FIG. 6, when the circuit board C is bent in a downwardly convex shape, the control device 20 automatically determines a position where the circuit board C is bent downward beyond a predetermined threshold value. Alternatively, the support pin 56 may be arranged and pushed upward. Alternatively, the control device 20 urges the operator via the interface device 22 to place the support pin 56 and push it upward in a place where the circuit board C is bent downward beyond a predetermined threshold value. May be. With such a configuration, it is possible to improve the productivity by suppressing the occurrence of defects in the solder printing operation.

Instead of providing the circuit board measuring device 64a and the screen mask measuring device 64b separately as in the above embodiment, as shown in FIG. 7, a measuring device 92 that is a single laser length measuring device is used to measure the imaging measuring device. The distance in the Z direction from the circuit board C to the circuit board C and the distance in the Z direction from the imaging measurement device 26 to the screen mask 28 may be measured. In the example shown in FIG. 7, the measuring device 92 is held by the XY direction moving mechanism 60 via the rotating mechanism 90. The rotation mechanism 90 can be rotated around the Y axis with respect to the XY direction movement mechanism 60 by driving a motor (not shown). The control device 20 can measure the distance in the Z direction from the imaging measurement device 26 to the circuit board C by driving the rotation mechanism 90 and directing the measurement device 92 toward the circuit board C. By driving and directing the measuring device 92 toward the screen mask 28, the distance in the Z direction from the imaging measuring device 26 to the screen mask 28 can also be measured.

In the above embodiment, the case where a laser length measuring device is used as the circuit board measuring device 64a, the screen mask measuring device 64b, and the measuring device 92 has been described. However, the circuit board measuring device 64a, the screen mask measuring device 64b, and the measuring device 92 are used. As long as the distance to the object can be measured, another length measuring device such as an ultrasonic length measuring device may be used. Alternatively, the imaging measuring device 26 may be further provided with a Z-direction moving mechanism to measure the distance to the circuit board C and the screen mask 28 by focusing the image. In this case, the control device 20 images the circuit board C or the screen mask 28 with the circuit board imaging device 62a or the screen mask imaging device 62b while changing the position of the imaging measuring device 26 in the Z direction, and the imaging at the time when the focus is achieved. Based on the position of the measuring device 26 in the Z direction, the distance to the circuit board C or the screen mask 28 is calculated.

In the above embodiment, when a displacement is detected between the circuit board C and the screen mask 28, the control device 20 drives the Y-direction moving mechanism 40, the X-direction moving mechanism 42, and the rotating mechanism 44, and the circuit board. The configuration for finely adjusting the position of C has been described, but instead of these mechanisms, a mechanism for adjusting the Y-direction position, the X-direction position, and the angle around the Z-axis of the screen mask 28 is provided. A configuration for finely adjusting the position may be employed.

In the above-described embodiment, the distribution in the XY plane of the distance in the Z direction from the circuit board measuring device 64a to the upper surface of the circuit board C, obtained by the circuit board measuring device 64a, and the shape data of the upper surface of the circuit board C However, any data may be used as the shape data of the upper surface of the circuit board C as long as the control device 20 can recognize the shape of the upper surface of the circuit board C. Similarly, in the above-described embodiment, the distribution in the XY plane of the distance in the Z direction from the screen mask measuring device 64b to the lower surface of the screen mask 28, which is obtained by the screen mask measuring device 64b, is represented by the lower surface of the screen mask 28. However, the shape data of the lower surface of the screen mask 28 may be any data as long as the control device 20 can recognize the shape of the lower surface of the screen mask 28.

In the above embodiment, based on the shape data of the upper surface of the circuit board C acquired by the circuit board measuring device 64a and the shape data of the lower surface of the screen mask 28 acquired by the screen mask measuring device 64b, The configuration for setting the rising amount has been described. However, when it is not necessary to acquire the shape data of the lower surface of the screen mask 28, such as when the deflection of the screen mask 28 is negligibly small, it is acquired by the circuit board measuring device 64a. Alternatively, the rising amount of the circuit board C may be set based only on the shape data of the upper surface of the circuit board C.

In the above embodiment, based on the shape data of the upper surface of the circuit board C acquired by the circuit board measuring device 64a and the shape data of the lower surface of the screen mask 28 acquired by the screen mask measuring device 64b, Although the configuration for setting the ascent amount has been described, the configuration is configured to control the operations of the lifting mechanism 46 of the circuit board positioning device 24, the Y-direction moving mechanism 72 of the squeegee device 30, and the squeegee head 74 in a different manner. May be. For example, in the above embodiment, the circuit board is based on the shape data of the upper surface of the circuit board C acquired by the circuit board measuring device 64a and the shape data of the lower surface of the screen mask 28 acquired by the screen mask measuring device 64b. The number of stages of plate separation operation from the screen mask 28 of C, the descending distance or descending speed of the circuit board C at each stage of the plate separating operation, or the printing speed or printing pressure by the squeegee device 30 are adjusted. May be.

Specific and non-limiting specific examples of the present invention have been described in detail with reference to the drawings. This detailed description is intended merely to present those skilled in the art with the details for practicing the preferred embodiments of the present invention and is not intended to limit the scope of the invention. Also, the disclosed additional features and inventions can be used separately from or together with other features and inventions to provide further improved screen printers.

Further, the combinations of features and steps disclosed in the above detailed description are not indispensable when practicing the present invention in the broadest sense, and are only for explaining representative specific examples of the present invention. It is described. Moreover, various features of the representative embodiments described above, as well as various features of what is recited in the claims, are described herein in providing additional and useful embodiments of the present invention. They do not have to be combined in the specific examples or in the order listed.

All the features described in the specification and / or claims are described in the disclosure and the claims at the beginning of the application separately from the configuration of the features described in the embodiments and / or claims. It is intended that the specific details provided be disclosed separately and independently of one another. Further, all numerical ranges and descriptions regarding groups or groups are intended to disclose intermediate configurations thereof as a limitation to the specific matters described in the original disclosure and the claims.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

Claims

A screen comprising a screen mask, a circuit board lifting mechanism for holding the circuit board and raising it toward the screen mask, and a squeegee driving mechanism for moving the squeegee along the screen mask while abutting the upper surface of the screen mask A printing press,
A circuit board imaging device which is movable in a horizontal plane and images a recognition mark of the circuit board from above the circuit board;
A circuit board measuring device that is movable integrally with the circuit board imaging device and acquires shape data of an upper surface of the circuit board;
A control device for controlling the operation of the circuit board lifting mechanism and the squeegee driving mechanism;
The screen printing machine, wherein the control device controls operations of the circuit board lifting mechanism and / or the squeegee driving mechanism based on shape data of the upper surface of the circuit board acquired by the circuit board measuring device.
A screen mask imaging device which is movable in a horizontal plane and images a recognition mark of the screen mask from below the screen mask;
A screen mask measuring device that is movable integrally with the screen mask imaging device and that acquires shape data of a lower surface of the screen mask;
Based on the shape data of the upper surface of the circuit board acquired by the circuit board measuring device and the shape data of the lower surface of the screen mask acquired by the screen mask measuring device, the control device moves the circuit board lifting mechanism. The screen printing machine according to claim 1, wherein the operation of the squeegee driving mechanism is controlled.
The screen printing machine according to claim 2, wherein the circuit board imaging device, the circuit board measuring device, the screen mask imaging device, and the screen mask measuring device are held by the same moving mechanism.
Based on the shape data of the upper surface of the circuit board acquired by the circuit board measuring device and the shape data of the lower surface of the screen mask acquired by the screen mask measuring device, the control device moves the circuit board lifting mechanism. The screen printing machine according to claim 3, wherein the amount of rise of the circuit board is adjusted.
The control device sets the distance from the upper surface of the circuit board to the lower surface of the screen mask in the vicinity of the end of the circuit board as the amount of the circuit board raised by the circuit board lifting mechanism. Screen printing machine.
5. The control device according to claim 4, wherein the control device sets the distance from the upper surface of the circuit board to the lower surface of the screen mask in the vicinity of the center portion of the circuit board as the amount of rise of the circuit board by the circuit board lifting mechanism. Screen printing machine.
The screen printing machine according to claim 4, wherein the control device sets a minimum value of a distance from an upper surface of the circuit board to a lower surface of the screen mask as an amount of the circuit board raised by the circuit board lifting mechanism.
The screen printing machine according to claim 4, wherein the control device sets a maximum value of a distance from an upper surface of the circuit board to a lower surface of the screen mask to an amount of the circuit board raised by the circuit board lifting mechanism.