JP2019010884A - Screen printing method, screen printing device, and component mounting line - Google Patents

Abstract

To provide a screen printing method capable of efficiently printing 2 kinds of paste having different thickness without increasing the size of whole device, a screen printing device, and a component mounting line.SOLUTION: After a printing head 17 is abutted against an intermediate region Rm in a state that a substrate 2 is in contact with a front masking region R1, the printing head 17 is moved to a region in an opposite side of the intermediate region Rm of the front masking region R1, and further the printing head 17 is moved to the intermediate region Rm to conduct primary printing on the substrate 2, after the substrate 2 is snapped off from a mask 13, the printing head 17 is moved from the intermediate region Rm to a region in an opposite side of the intermediate region Rm of a back masking region R2 with a state that the substrate 2 is in contact with the back masking region R2, and further the printing head 17 is moved to the intermediate region Rm to conduct secondary printing on the substrate 2. After primary printing is completed, the secondary printing is initiated while the printing head 17 is kept to be abutted against the intermediate region Rm.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a screen printing method for printing a paste on a substrate using a mask having openings formed therein, a screen printing apparatus, and a component mounting line including the screen printing apparatus.

  The screen printing apparatus prints the paste on the substrate by bringing the mask in which the opening is formed into contact with the substrate and filling the opening with the paste by the print head. The thickness of the paste printed on the substrate can be set according to the thickness of the mask. Usually, the thickness of the paste for a single substrate is single (one type). For a board on which a small part such as a chip part and a large part such as a connector are mixedly mounted, a larger amount of paste is required when joining a large part than when joining a small part. Sometimes it is necessary to print a seed paste. In this case, conventionally, two masks having different thicknesses and having openings formed in each other are arranged in parallel in the screen printing apparatus, and after printing with the thinner mask, Printing was performed with a thick mask (for example, Patent Document 1).

JP 2014-120745 A

  However, when two masks are arranged in one screen printing apparatus, there is a problem that the whole apparatus becomes large.

  Therefore, an object of the present invention is to provide a screen printing method, a screen printing apparatus, and a component mounting line capable of efficiently printing two types of pastes having different thicknesses without increasing the size of the apparatus.

  The screen printing method of the present invention has a first opening in the first region and a second opening in a second region having a thickness larger than that of the first region, and further includes the first opening. A screen printing method for printing paste on a substrate by a print head through a mask having an intermediate region between a region and the second region, wherein the substrate is in contact with the first region After the print head is brought into contact with the intermediate region, the print head is moved to a region of the first region opposite to the intermediate region, and the print head is further moved to the intermediate region. After performing primary printing on the substrate and separating the plate from the mask, the print head is moved from the intermediate region to the intermediate region in a state where the substrate is in contact with the second region. Contrary to region The secondary printing is performed on the substrate by moving the print head to the intermediate area, and the print head is kept in contact with the intermediate area after the primary printing is completed. The secondary printing is started.

  The screen printing apparatus of the present invention has a first opening in the first region and a second opening in a second region having a thickness larger than that of the first region, and further includes the first opening. A mask having an intermediate region between the region and the second region; and a paste is filled in the first opening in a state where the substrate is in contact with the first region, and the substrate is in the second region A print head that fills the second opening with a paste in contact with the substrate, and a substrate holding unit that holds the substrate and brings the substrate into contact with the first region or the second region, The print head contacts the intermediate region in a state where the substrate is in contact with the first region, and then moves to a region opposite to the intermediate region of the first region, and further to the intermediate region. Perform primary printing on the substrate by moving After the substrate is released from the mask, the substrate moves from the intermediate region to a region on the opposite side of the second region in contact with the second region, and further moves to the intermediate region. Thus, the secondary printing is performed on the substrate, and after the primary printing is finished, the secondary printing is started while being in contact with the intermediate region, and the substrate holding unit After printing, the substrate that is in contact with the first region is released from the plate and is brought into contact with the second region.

  A component mounting line according to the present invention includes the screen printing apparatus according to the present invention, and a component mounting apparatus that mounts a component on a substrate on which a paste is printed by the screen printing apparatus.

  According to the present invention, it is possible to efficiently print two types of pastes having different thicknesses without increasing the size of the apparatus.

The top view of the component mounting line in 1st Embodiment of this invention The top view of the board | substrate which the component mounting line in 1st Embodiment of this invention mounts components The top view of the screen printing apparatus in 1st Embodiment of this invention. The side view of the screen printing apparatus in 1st Embodiment of this invention. The top view of the mask with which the screen printing apparatus in 1st Embodiment of this invention is provided. Side sectional drawing of the mask with which the screen printing apparatus in 1st Embodiment of this invention is provided. (A) (b) The partial side view of the screen printing apparatus in 1st Embodiment of this invention. (A) (b) Side sectional view of the mask and substrate provided in the screen printing apparatus according to the first embodiment of the present invention. The block diagram which shows the control system of the screen printing apparatus in 1st Embodiment of this invention. (A) (b) Operation | movement explanatory drawing of the screen printing apparatus in 1st Embodiment of this invention. (A) (b) Operation | movement explanatory drawing of the screen printing apparatus in 1st Embodiment of this invention. (A) (b) The figure which shows the mask and board | substrate with which the screen printing apparatus in 1st Embodiment of this invention is provided. (A) (b) Operation | movement explanatory drawing of the screen printing apparatus in 1st Embodiment of this invention. (A) (b) The figure which shows the mask and board | substrate with which the screen printing apparatus in 1st Embodiment of this invention is provided. (A) (b) Operation | movement explanatory drawing of the screen printing apparatus in 1st Embodiment of this invention. (A) (b) Operation | movement explanatory drawing of the screen printing apparatus in 1st Embodiment of this invention. (A) (b) The figure which shows the mask and board | substrate with which the screen printing apparatus in 1st Embodiment of this invention is provided. (A) (b) Operation | movement explanatory drawing of the screen printing apparatus in 1st Embodiment of this invention. (A) (b) The figure which shows the mask and board | substrate with which the screen printing apparatus in 1st Embodiment of this invention is provided. Side view of the screen printing apparatus according to the second embodiment of the present invention. The side view of the mask with which the screen printing apparatus in 2nd Embodiment of this invention is provided. Side view of a screen printing apparatus according to a third embodiment of the present invention. The side view of the mask with which the screen printing apparatus in 3rd Embodiment of this invention is provided. (A) (b) The partial side view of the screen printing apparatus in 3rd Embodiment of this invention.

(First embodiment)
FIG. 1 shows a component mounting line 1 according to the first embodiment of the present invention. The component mounting line 1 is for manufacturing the mounting substrate 2J by mounting the component 3 on the substrate 2, and includes a screen printing device 4 and a component mounting device 5 arranged on the downstream process side. The screen printing device 4 receives the substrate 2 input from the upstream process side, screen-prints the paste Pst on the electrode 2D of the substrate 2, and transfers it to the component mounting device 5. The component mounting device 5 receives the substrate 2 from the screen printing device 4, and mounts the component 3 on the electrode 2D on which the paste Pst is printed. In the following description, for the sake of convenience, it is assumed that the left-right direction of the component mounting line 1 viewed from the operator OP is the X-axis direction, and the board 2 flows in the X-axis direction from left to right. Further, the front-rear direction of the component mounting line 1 viewed from the operator OP is defined as the Y-axis direction, and the vertical direction is defined as the Z-axis direction.

  As shown in FIG. 2, the electrode 2D included in the substrate 2 includes two types of electrodes (a first type electrode 2a and a second type electrode 2b). The first type electrode 2a is an electrode on which a small component 3 such as a chip component is mounted, and the second type electrode 2b is an electrode on which a large component 3 such as a connector is mounted. For this reason, the second type electrode 2b requires more paste Pst than the first type electrode 2a, and the screen printing apparatus 4 has a thicker paste for the second type electrode 2b than the first type electrode 2a. Print Pst. A region S1 shown in FIG. 2 indicates a region on the substrate 2 where the first type electrode 2a is provided, and a region S2 indicates a region on the substrate 2 where the second type electrode 2b is provided. .

  3 and 4, the screen printing apparatus 4 includes a substrate holding / moving mechanism 12 on a base 11, and a mask 13 is provided above the substrate holding / moving mechanism 12. On the upstream process side of the substrate holding and moving mechanism 12 on the base 11, a carry-in conveyor 14 is provided that receives the substrate 2 put in from the outside of the screen printing apparatus 4 and transports it to the substrate holding and moving mechanism 12. On the downstream process side of the substrate holding / moving mechanism 12 on the base 11, a carry-out conveyor 15 that receives the substrate 2 from the substrate holding / moving mechanism 12 and conveys it to the downstream process side apparatus (here, the component mounting apparatus 5) is provided. ing. A camera 16 is provided below the mask 13, and a print head 17 is provided above the mask 13.

  In FIG. 4, the substrate holding and moving mechanism 12 includes a substrate holding unit 21 and a moving table unit 22. The substrate holding part 21 includes a positioning conveyor 31 (see also FIG. 3), a lower receiving part 32, and a pair of clampers 33 (see also FIG. 3). The positioning conveyor 31 positions the substrate 2 sent from the carry-in conveyor 14 at a predetermined clamp position. The lower receiving portion 32 supports the substrate 2 positioned by the positioning conveyor 31 at the clamp position from below, and the clamper 33 clamps the substrate 2 from the Y-axis direction. Thus, the substrate 2 is held by the lower receiving portion 32 and the clamper 33. Of the two clampers 33 provided in the substrate holding unit 21, the one located on the worker OP side is referred to as a front clamper 33F, and the one located on the opposite side of the worker OP is referred to as a rear clamper 33R. The moving table unit 22 includes a multi-layered table mechanism, and moves the substrate holding unit 21 holding the substrate 2 in the horizontal plane direction and the vertical direction.

  In FIG. 5, the mask 13 has a rectangular flat plate shape extending in the XY plane. The outer periphery of the mask 13 is supported by a frame member 13w. The thickness of the front region and the rear region of the mask 13 is different, and the thickness of the rear region is larger than the thickness of the front region.

  As shown in FIGS. 4 and 5, the region on the front side of the mask 13 has a front masking region R <b> 1 (first region) as a region in contact with the substrate 2, and the region on the rear side of the mask 13. Has a rear masking region R2 (second region) as a region in contact with the substrate 2. A region between the front masking region R1 and the rear masking region R2 is an intermediate region Rm having a thickness difference (step) between the front masking region R1 and the rear masking region R2. In the first embodiment, the lower surface of the front masking region R1 and the lower surface of the rear masking region R2 are the same plane, and the lower surface height of the front masking region R1 and the lower surface height of the rear masking region R2 are equal (FIG. 6). ).

  A first type opening K1 (first opening) is provided in the front masking region R1, and a second type opening K2 (second opening) is provided in the rear masking region R2. The first type opening K1 is provided in a first pattern according to the arrangement of the first type electrode 2a, and the second type opening K2 is provided in a second pattern according to the arrangement of the second type electrode 2b. Yes. That is, the mask 13 has the first type opening K1 in the front masking region R1 and the second type opening K2 in the rear masking region R2 having a thickness larger than that of the front masking region R1.

  3 and 4, the camera 16 includes an upper imaging unit 16a with the imaging field of view facing upward and a lower imaging unit 16b with the imaging field of view facing downward. The camera 16 is driven by the camera moving mechanism 16K and moves in the XY plane. The upper imaging unit 16a of the camera 16 images the mask side mark 13m (FIG. 5) provided in each of the front masking area R1 and the rear masking area R2 of the mask 13 from below. The lower imaging unit 16b of the camera 16 images the substrate side mark 2m (FIG. 3) of the substrate 2 held by the substrate holding unit 21 from above.

  The substrate holding / moving mechanism 12 aligns the substrate 2 with respect to the mask 13 by referring to the relative positions of the mask side mark 13m and the substrate side mark 2m captured by the camera 16, and then raises the substrate 2 to mask it. 13 is brought into contact with the lower surface. When the paste Pst is printed on the first type electrode 2a, the substrate 2 is brought into contact with the front masking region R1 (FIG. 7A), and when the paste Pst is printed on the second type electrode 2b, the substrate 2 is placed in the rear masking region R2. Contact is made (FIG. 7B).

  When the substrate 2 held by the substrate holder 21 is brought into contact with the front masking region R1, the front clamper 33F is positioned in front of the front masking region R1, and the rear clamper 33R is positioned in the intermediate region Rm behind the front masking region R1. (FIG. 7A). On the other hand, when the substrate 2 held by the substrate holder 21 is brought into contact with the rear masking region R2, the rear clamper 33R is positioned behind the rear masking region R2, and the front clamper 33F is an intermediate region Rm in front of the rear masking region R2. (FIG. 7B). The paste Pst is supplied to the intermediate region Rm at the start of printing (FIG. 5).

  When the substrate 2 is brought into contact with the front masking region R1, the first type electrode 2a of the substrate 2 matches the first type opening K1 of the mask 13, and is exposed to the upper surface side of the mask 13 through the first type opening K1 (FIG. 8). (A)). The thickness T1 of the mask 13 in the front masking region R1 is the thickness of the paste Pst when the paste Pst is printed on the first type electrode 2a as it is. On the other hand, when the substrate 2 is brought into contact with the rear masking region R2, the second type electrode 2b matches the second type opening K2 of the mask 13, and is exposed to the upper surface side of the mask 13 through the second type opening K2 (FIG. 8 ( b)). The thickness T2 of the mask 13 in the rear masking region R2 is the thickness of the paste Pst when the paste Pst is printed on the second type electrode 2b as it is.

  3 and 4, the print head 17 is provided on the moving base 41, the moving base 41 extending in the X-axis direction, the two squeegees 42 disposed below the moving base 41 in the Y-axis direction, and the moving base 41. The squeegee 42 is composed of two squeegee lifting cylinders 43 that lift and lower the squeegee 42 with respect to the moving base 41. The moving base 41 is driven by the print head moving mechanism 17K to move in the Y-axis direction, whereby each squeegee 42 is moved in the Y-axis direction. Of the two squeegees 42 arranged side by side in the Y-axis direction, the one located on the front (right side in FIG. 4) is referred to as the front squeegee 42F, and the one located on the rear (left side in FIG. 4) is the rear squeegee. It is called 42R.

  The control device 50 (see FIG. 9) provided in the screen printing apparatus 4 controls each of the transfer operation of the substrate 2 by the carry-in conveyor 14, the holding and moving operation of the substrate 2 by the substrate holding and moving mechanism 12, and the transfer operation of the substrate 2 by the carry-out conveyor 15. ) Do. The control device 50 also controls the movement of the camera 16 by the camera movement mechanism 16K, the movement of the print head 17 by the print head movement mechanism 17K, the movement of the squeegee 42 by the squeegee lifting cylinder 43, and the imaging operation of the camera 16. Do. Image data obtained by imaging by the camera 16 is sent to the control device 50, and image recognition processing is performed in the image processing unit 50a (FIG. 9) of the control device 50.

  Next, the operation of the screen printing apparatus 4 configured as described above will be described. The screen printing apparatus 4 uses the first type opening K1 in the front masking region R1 to print the paste Pst on the first type electrode 2a (primary printing), and then uses the second type opening K2 in the rear masking region R2. The paste Pst is printed (secondary printing) on the second type electrode 2b.

  When the substrate 2 is loaded from the upstream process side, the carry-in conveyor 14 receives the substrate 2 and delivers it to the substrate holding unit 21. The substrate holding unit 21 positions the substrate 2 received from the carry-in conveyor 14 at a predetermined clamping position by the positioning conveyor 31, supports it from below by the lower receiving unit 32, and clamps it by the clamper 33 (FIG. 10A). Arrow A) shown in the figure. When the substrate holding unit 21 holds the substrate 2 in this way, the substrate holding / moving mechanism 12 moves the substrate holding unit 21 to position the substrate 2 below the front masking region R1 (FIG. 10B). Arrow B1).

  When the substrate 2 is positioned below the front masking region R1, the camera 16 moves, the upper imaging unit 16a images the mask side mark 13m in the front masking region R1, and the lower imaging unit 16b images the substrate side mark 2m ( FIG. 11 (a)). When the imaging by the camera 16 is completed, the substrate holding / moving mechanism 12 moves the substrate 2 so that the obtained mask side mark 13m and the obtained substrate side mark 2m coincide with each other in plan view, and then lifts the substrate 2 to move the front masking region R1. The substrate 2 is brought into contact with (FIG. 11 (b), arrow C1 shown in the figure). As a result, each first type electrode 2a is exposed on the upper surface side of the mask 13 in alignment with the corresponding first type opening K1. On the other hand, each second-type electrode 2b is covered with the mask 13 (FIG. 12 (a) → FIG. 12 (b)).

  When the substrate 2 comes into contact with the front masking region R1, the print head 17 lowers the rear squeegee 42R so that the lower end thereof contacts the intermediate region Rm of the mask 13. Then, the rear squeegee 42R is slid on the front masking region R1 by moving the rear squeegee 42R from the intermediate region Rm to the region in front of the front masking region R1 (in FIGS. 13 (a) and 14 (a)). Arrow D1) shown. When the rear squeegee 42R moves to the area in front of the front masking area R1, the print head 17 raises the rear squeegee 42R, and then lowers the front squeegee 42F and makes its lower end contact the mask 13. Then, the front squeegee 42F is slid on the front masking region R1 by moving the front squeegee 42F from the region in front of the front masking region R1 to the intermediate region Rm (arrow D2 shown in FIG. 13B). When the paste Pst is filled in each first type opening K1 by sliding the squeegee 42 (FIG. 14A), the substrate holding and moving mechanism 12 lowers the substrate holding portion 21 (FIG. 15A). The arrow C2) shown in FIG. As a result, a layer of paste Pst having a thickness corresponding to the thickness T1 of the mask 13 in the front masking region R1 is formed on each first type electrode 2a of the substrate 2 (FIG. 14B), and the primary printing is completed. To do.

  When the primary printing is completed, the substrate holding and moving mechanism 12 moves the substrate holding unit 21 to position the substrate 2 below the rear masking region R2 (arrow B2 shown in FIG. 15B). When the substrate 2 is positioned below the rear masking region R2, the camera 16 moves, the upper imaging unit 16a images the mask side mark 13m in the rear masking region R2, and the lower imaging unit 16b images the substrate side mark 2m ( FIG. 16 (a)). When the imaging by the camera 16 is completed, the substrate holding / moving mechanism 12 moves the substrate 2 so that the obtained mask side mark 13m and the obtained substrate side mark 2m coincide with each other in plan view, and then lifts the substrate 2 to move the rear masking region R2. The substrate 2 is brought into contact with (FIG. 16B, arrow C1 shown in the figure). As a result, each second type electrode 2b is exposed to the upper surface side of the mask 13 in alignment with the corresponding second type opening K2. On the other hand, the paste Pst printed on the first-type electrode 2a is accommodated in a recess H for avoiding interference provided in the rear masking region R2 (FIG. 17 (a) → FIG. 17 (b)). In addition, after the end of the primary printing, the front squeegee 42F remains stopped with the lower end abutting against the intermediate region Rm.

  The depression H is provided in the rear masking region R2 in a pattern corresponding to the arrangement of the first type electrode 2a (that is, in the first pattern). When the substrate 2 comes into contact with the rear masking region R2, the first recess H is formed. The paste Pst printed on the upper surface of the seed electrode 2a is completely accommodated. For this reason, during the secondary printing, it is avoided that the paste Pst printed on the first type electrode 2a by the primary printing contacts the lower surface of the mask 13.

  When the substrate 2 comes into contact with the rear masking region R2 of the mask 13, the print head 17 moves the front squeegee 42F over the rear masking region R2 by moving the front squeegee 42F from the intermediate region Rm to the region behind the rear masking region R2. Slide (arrow E1 shown in FIG. 18A). When the front squeegee 42F has moved to the area behind the rear masking area R2, the print head 17 raises the front squeegee 42F, and then lowers the rear squeegee 42R so that the lower end of the squeegee 42 abuts against the mask 13. Then, the rear squeegee 42R is slid on the rear masking region R2 by moving the rear squeegee 42R from the rear region of the rear masking region R2 to the intermediate region Rm (in FIGS. 18B and 19A). Arrow E2). When the paste Pst is filled in each of the second type openings K2 by sliding the squeegee 42 (FIG. 19A), the substrate holding and moving mechanism 12 lowers the substrate holding portion 21 to release the plate. As a result, a layer of paste Pst having a thickness corresponding to the thickness T2 of the mask 13 in the rear masking region R2 is formed on each second type electrode 2b of the substrate 2 (FIG. 19B), and the secondary printing is completed. To do.

  As described above, the squeegee 42 slides on the front masking region R1 of the mask 13 to fill the first type opening K1 with the paste Pst, and then stops at the intermediate region Rm between the front masking region R1 and the rear masking region R2. Thereafter, the movement from the intermediate region Rm is started and the rear masking region R2 is slid to fill the second type opening K2 with the paste Pst. That is, the squeegee 42 (specifically, the front squeegee 42F) is not separated from the mask 13 between the sliding operation on the front masking region R1 and the sliding operation on the rear masking region R2. For this reason, it is possible to print two types (two types of thickness) of pastes Pst having different thicknesses smoothly and efficiently.

  When the paste Pst is printed on each electrode 2D (first-type electrode 2a and second-type electrode 2b) on the substrate 2 as described above and the screen printing per one substrate 2 is completed, the substrate holding and moving mechanism 12 Opens the clamper 33 to release the holding of the substrate 2. Then, the positioning conveyor 31 is operated and delivered to the carry-out conveyor 15, and the carry-out conveyor 15 carries the received board 2 to the component mounting apparatus 5 on the downstream process side.

  In FIG. 1, the component mounting apparatus 5 picks up a substrate conveying conveyor 71 that conveys and positions a substrate 2, a parts feeder 72 that supplies components 3, and a component 3 that is supplied by the parts feeder 72 by a mounting head 73 to convey the substrate. A mounting mechanism 74 for mounting on the substrate 2 positioned by the conveyor 71 is provided. In the component mounting apparatus 5, a small component such as a chip component is mounted on the first type electrode 2a, and a large component such as a connector is mounted on the second type electrode 2b. When the mounting operation of the component 3 on the board 2 is completed, the component mounting apparatus 5 operates the board transport conveyor 71 to carry the board 2 to the downstream process side. In this way, the mounting board 2J is manufactured by the component mounting line 1.

(Second Embodiment)
FIG. 20 shows the screen printing apparatus 4 according to the second embodiment of the present invention. The screen printing apparatus 4 in the second embodiment is substantially the same as the screen printing apparatus 4 in the first embodiment and operates at the time of screen printing, but the configuration of the mask 13 is different. That is, the mask 13 of the screen printing apparatus 4 in the second embodiment is the inclined surface in which the upper surface of the intermediate region Rm connects the upper surface of the front masking region R1 and the upper surface of the rear masking region R2 in the mask 13 of the first embodiment. 13S (see also FIG. 21). As a result, the upper surface of the front masking region R1 and the upper surface of the rear masking region R2 are smoothly connected, and the movement of the paste Pst on the mask 13 becomes smooth, so that the scraping operation of the paste Pst becomes smooth.

(Third embodiment)
FIG. 22 shows the screen printing apparatus 4 according to the third embodiment of the present invention. The screen printing apparatus 4 in the third embodiment is substantially the same as the screen printing apparatus 4 in the first embodiment and operates at the time of screen printing, but the configuration of the mask 13 is different. That is, in the screen printing apparatus 4 according to the third embodiment, the upper surface of the front masking region R1 and the upper surface of the rear masking region R2 are the same plane, and the upper surface height of the front masking region R1 and the upper surface height of the rear masking region R2 are equal. (See also FIG. 23). For this reason, as in the second embodiment, the movement of the paste Pst on the mask 13 becomes smooth, and the scraping operation of the paste Pst becomes smooth.

  As can be seen from FIGS. 22 and 23, in the third embodiment, the lower surface height of the rear masking region R2 is lower than the lower surface height of the front masking region R1, and the step in both regions is formed on the lower surface side of the mask 13. Yes. Therefore, when the substrate 2 is brought into contact with the front masking region R1, the rear clamper 33R is brought into contact with the front masking region R1 (FIG. 24A). Further, when the substrate 2 is brought into contact with the rear masking region R2, the front clamper 33F is brought into contact with the rear masking region R2 (FIG. 24B). In the first embodiment and the second embodiment, the height when the substrate 2 contacts the front masking region R1 and the height when the substrate 2 contacts the rear masking region R2 are the same, but in the third embodiment, The height when the substrate 2 contacts the front masking region R1 and the height when the substrate 2 contacts the rear masking region R2 differ by the level difference.

  As described above, the screen printing apparatus 4 in the first to third embodiments described above has the first type opening K1 (first opening) in the front masking region R1 (first region) and the rear masking region. A mask 13 having a second type opening K2 (second opening) is provided in R2 (second region). The first type opening K1 is filled with the paste Pst while the substrate 2 is in contact with the front masking region R1, and then the paste is applied to the second type opening K2 while the substrate 2 is in contact with the rear masking region R2. By filling Pst, two types of pastes Pst having different thicknesses can be printed on the substrate 2. That is, one mask 13 has a function equivalent to two masks, and only one mask 13 is prepared. For this reason, according to the screen printing apparatus 4 in the first to third embodiments, two types of pastes Pst having different thicknesses can be printed without increasing the size of the apparatus.

  In the first to third embodiments described above, the print head 17 includes the squeegee 42 that slides on the mask 13 and fills the first type opening K1 and the second type opening K2 with the paste Pst. However, the print head 17 is not necessarily provided with the squeegee 42. For example, the first type opening K1 and the second type opening K2 may be filled with the paste Pst by moving on the mask 13 while discharging the paste Pst enclosed in the cartridge. In this case, if the paste Pst is filled into the second type opening K2 after the first type opening K1 is filled with the paste Pst, the moving direction of the print head 17 is arbitrary. Furthermore, in the above-described first to third embodiments, two regions (first region and second region) having different thicknesses are provided side by side in the front-rear direction of the mask 13, but this is an example. Yes, it may be provided side by side in a direction other than the front-rear direction of the mask 13.

  Provided are a screen printing method, a screen printing apparatus, and a component mounting line capable of efficiently printing two types of pastes having different thicknesses without increasing the size of the entire apparatus.

DESCRIPTION OF SYMBOLS 1 Component mounting line 2 Board | substrate 3 Component 4 Screen printing apparatus 5 Component mounting apparatus 13 Mask 13S Inclined surface 17 Print head 42 Squeegee R1 Front masking area | region (1st area | region)
R2 Back masking area (second area)
Rm Intermediate region K1 First kind opening (first opening)
K2 Second kind opening (second opening)
Pst paste

Claims (12)

The first region has a first opening and has a second opening in a second region having a thickness larger than that of the first region. Further, the first region, the second region, A screen printing method for printing a paste on a substrate by a print head through a mask having an intermediate region between,
After the print head is brought into contact with the intermediate region in a state where the substrate is in contact with the first region, the print head is moved to a region of the first region opposite to the intermediate region, and First printing is performed on the substrate by moving the print head to the intermediate region, and after the substrate is separated from the mask, the print head is moved in a state where the substrate is in contact with the second region. Moving the intermediate region from the second region to the region opposite to the intermediate region, and further performing the secondary printing on the substrate by moving the print head to the intermediate region;
The screen printing method, wherein after the primary printing is finished, the secondary printing is started while the print head is in contact with the intermediate region.   The screen printing method according to claim 1, wherein the print head includes a squeegee that slides on the mask and fills the first opening and the second opening with paste.   The screen printing method according to claim 1, wherein the lower surface height of the first region is equal to the lower surface height of the second region.   The screen printing method according to claim 3, wherein the intermediate area includes an inclined surface that connects an upper surface of the first area and an upper surface of the second area.   The screen printing method according to claim 1, wherein a top surface height of the first region is equal to a top surface height of the second region.   The screen printing method according to claim 1, wherein after the primary printing, the substrate is released from the mask and the substrate is brought into contact with the second region. The first region has a first opening and has a second opening in a second region having a thickness larger than that of the first region. Further, the first region, the second region, A mask having an intermediate region between,
A print head that fills the first opening with a substrate in contact with the first region, and fills the second opening with the substrate in contact with the second region;
A substrate holding unit for holding the substrate and bringing the substrate into contact with the first region or the second region;
The print head contacts the intermediate region in a state where the substrate is in contact with the first region, and then moves to a region opposite to the intermediate region of the first region, and further to the intermediate region. The primary printing is performed on the substrate by moving, and after the substrate is released from the mask, the intermediate region is opposite to the intermediate region from the intermediate region in contact with the second region. The secondary printing is performed on the substrate by moving to the intermediate area and further to the intermediate area, and after the primary printing is finished, the secondary printing remains in contact with the intermediate area. Start
The screen printing apparatus, wherein the substrate holding unit separates the substrate in contact with the first region after the primary printing and contacts the second region.   The screen printing apparatus according to claim 7, wherein the print head includes a squeegee that slides on the mask and fills the first opening and the second opening with paste.   9. The screen printing apparatus according to claim 7, wherein a lower surface height of the first region is equal to a lower surface height of the second region.   The screen printing apparatus according to claim 9, wherein the intermediate region includes an inclined surface that connects an upper surface of the first region and an upper surface of the second region.   11. The screen printing apparatus according to claim 7, wherein an upper surface height of the first region is equal to an upper surface height of the second region.   12. A component mounting line comprising: the screen printing apparatus according to claim 7; and a component mounting apparatus for mounting a component on a substrate on which a paste is printed by the screen printing apparatus.

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