JP6318368B2 - Screen printing apparatus and screen printing method - Google Patents

Description

  The present invention relates to a screen printing apparatus and a screen printing method for printing a paste on a substrate by filling the opening area provided in the mask plate with a paste by sliding a squeegee on the mask plate.

  2. Description of the Related Art Conventionally, there is known a screen printing apparatus that prints a paste on a substrate by filling the opening area provided in the mask plate by sliding the squeegee on the mask plate and scraping the paste on the mask plate. Yes. In such a screen printing apparatus, in addition to the non-fine pitch area where the electrodes are arranged at a normal density on the substrate, there is a fine pitch area where the electrodes are arranged at a relatively higher density than the non-fine pitch area. When they are mixed, it is necessary to print the paste at a higher printing pressure on the electrodes in the fine pitch region than on the electrodes in the non-fine pitch region. For this reason, conventionally, when the paste is filled in the opening area of the mask plate corresponding to the fine pitch area, the attack angle is relatively smaller than when the paste is filled in the opening area of the mask plate corresponding to the non-fine pitch area. A small squeegee is used.

  In addition, a screen printing apparatus has been devised in which the attack angle can be switched during the sliding operation of the squeegee on the mask plate by giving the squeegee rotation about the horizontal axis (for example, the following patents) Reference 1). In this screen printing apparatus, when the squeegee fills the opening area corresponding to the fine pitch area with the paste, the squeegee attack angle is larger than when the squeegee fills the opening area corresponding to the non-fine pitch area. Switch so that becomes smaller. For this reason, even when the opening area corresponding to the fine pitch area and the opening area corresponding to the non-fine pitch area are mixed on the mask plate, the paste can be printed by one squeegee sliding operation.

JP 2006-315329 A

  However, in the screen printing apparatus configured to switch the attack angle of the squeegee during the sliding operation of the squeegee as described above, the direction in which the opening regions having different paste filling pressures are orthogonal to the sliding direction of the squeegee (longitudinal direction of the squeegee) In the case where they are lined up, the attack angle has to be set according to one of the opening areas, and the paste cannot be printed with an appropriate filling pressure in any opening area. .

  Therefore, an object of the present invention is to provide a screen printing apparatus and a screen printing method capable of filling a paste with an appropriate filling pressure in each of a plurality of opening areas having different paste filling pressures.

  The screen printing apparatus of the present invention includes: a mask plate that is in contact with a substrate; and the mask that slides on the mask plate that is in contact with the substrate and scrapes the paste on the mask plate on a paste scraping surface. A screen printing apparatus including a squeegee for filling a paste in an opening area provided in a plate, wherein the screen printing apparatus has an attack angle different from an attack angle of the squeegee at a position facing a part of the paste scraping surface. An additional squeegee was attached.

  The screen printing method of the present invention includes a substrate contacting step of bringing a substrate into contact with a mask plate, sliding a squeegee on the mask plate in contact with the substrate, and a paste on the mask plate on a paste scraping surface of the squeegee A paste filling step of filling the opening area provided in the mask plate with a paste filling step, wherein the squeegee is placed at a position facing a part of the paste scraping surface. The paste filling step is executed in a state where an additional squeegee having an attack angle different from the attack angle is attached.

  ADVANTAGE OF THE INVENTION According to this invention, a paste can be filled with a suitable filling pressure with respect to each of several opening area | regions from which the filling pressure of a paste differs.

The perspective view of the screen printing apparatus in one embodiment of this invention The perspective view of the principal part of the screen printing apparatus in one embodiment of this invention The side view of the squeegee with which the screen printing apparatus in one embodiment of this invention is provided The squeegee with which the screen printing apparatus in one embodiment of the present invention is provided is shown with an attachment squeegee. (A) Front view (b) Side view (A) Rear view (b) Partially exploded rear view of an attachment squeegee included in a screen printing apparatus according to an embodiment of the present invention The side view of the squeegee where the attachment squeegee in one embodiment of this invention was attached The figure explaining the attachment position with respect to the squeegee of the attachment squeegee in one embodiment of this invention

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a screen printing apparatus 1 according to an embodiment of the present invention. This screen printing apparatus 1 carries in the substrate 2 from the upstream process side (left side as viewed from the operator OP), prints the paste Pst on each electrode 2d (FIG. 2) on the substrate 2, and downstream the process side (worker) It is carried out to a component mounting apparatus (not shown) on the right side as viewed from the OP. In the present embodiment, the left-right direction viewed from the operator OP is the X-axis direction, the front-rear direction viewed from the operator OP is the Y-axis direction, and the up-down direction is the Z-axis direction.

  In FIG. 1, the screen printing apparatus 1 includes a carry-in conveyor 11, an intermediate conveyor 12, and a carry-out conveyor 13 in order from the left side of the base 10, and these carry-in conveyor 11, intermediate conveyor 12, and carry-out conveyor 13 are transport paths for the substrate 2. Is forming. The carry-in conveyor 11 carries the substrate 2 from the outside and delivers it to the intermediate conveyor 12, and the carry-out conveyor 13 carries the substrate 2 received from the intermediate conveyor 12 to the outside. The intermediate conveyor 12 constitutes a part of a substrate holding and moving unit 14 that holds and moves the substrate 2 loaded by the loading conveyor 11.

  In FIG. 1, a mask plate 15 is installed in a horizontal position above the substrate holding and moving unit 14. The mask plate 15 is made of a metallic plate-like member, and four sides are supported by a rectangular frame member 15w (see also FIG. 2). In FIG. 2, the mask plate 15 is provided with a large number of openings 16 (see also FIG. 3). The arrangement of the openings 16 corresponds to the arrangement of the electrodes 2d of the substrate 2.

  In FIG. 2, in addition to the non-fine pitch region R1 in which the electrodes 2d are arranged at a normal density on the substrate 2, the fine pitch in which the electrodes 2d are arranged at a relatively higher density than the non-fine pitch region R1. The region R2 is mixed, and the non-fine pitch region R1 and the fine pitch region R2 are arranged in the X-axis direction. Therefore, the mask plate 15 is also disposed in correspondence with the area of the opening 16 (first opening area S1) corresponding to the non-fine pitch area R1 of the substrate 2 and the fine pitch area R2 of the substrate 2. The first opening region S1 and the second opening region S2 are aligned in the X-axis direction. As described above, in the present embodiment, the mask plate 15 is provided with the first opening region S1 and the second opening region S2 arranged side by side in the X-axis direction.

  1 and 2, a reciprocating body 17 is provided above the mask plate 15 so as to extend in the X-axis direction. The reciprocating body 17 reciprocates in the Y-axis direction by the operation of the reciprocating body moving mechanism 18 including a ball screw mechanism. Two screen printing squeegees 20 are provided below the reciprocating member 17 so as to face each other in the Y-axis direction.

  2 and 3, two elevating cylinders 21 are provided side by side in the Y-axis direction on the upper surface of the reciprocating body 17. Each lifting cylinder 21 has its piston rod 21 a protruding below the reciprocating body 17. A squeegee 20 is connected to the piston rod 21a of each elevating cylinder 21 (see also FIG. 3). For this reason, when the elevating cylinder 21 projects and retracts the piston rod 21 a downward, the squeegee 20 connected to the piston rod 21 a moves up and down with respect to the reciprocating body 17. By operating the two lifting cylinders 21 individually, the two squeegees 20 can be lifted and lowered independently of each other.

  2 and 3, each squeegee 20 has a shape extending in the X-axis direction, and includes a blade holding portion 31 and a spatula-like blade 32 held by the blade holding portion 31. . The blade holding part 31 includes a main part 41 connected to the piston rod 21 a of the elevating cylinder 21, a backup part 42 provided in contact with the main part 41, and a screw 43 screwed into the main part 41. It has a holding part 44 attached to. The upper half of the blade 32 is sandwiched between the backup unit 42 and the pressing unit 44. A first locking groove 41m extending in the X-axis direction is formed on the upper surface of the main portion 41, and a second locking groove 44m extending in the X-axis direction is formed in the pressing portion 44.

  In FIG. 3, the lower half portion of the blade 32 protrudes obliquely below the blade holding portion 31 with the upper half portion of the blade 32 held between the blade holding portions 31. The direction in which the blade 32 protrudes below the blade holding portion 31 is the front lower side in the case of the blade 32 of the squeegee 20 on the front side (the squeegee 20 on the right side of FIG. 3), and the squeegee 20 on the rear side (in FIG. 3). If it is the blade 32 of the squeegee 20) on the left side of the page, it is the rear lower side. The surface on the rear side of the blade 32 of the squeegee 20 on the front side and the surface on the front side of the blade 32 of the squeegee 20 on the front side are each scraped when the paste Pst on the mask plate 15 is scraped by the squeegee 20. It becomes the surface 32a.

  Each squeegee 20 has a standby position where the lower end of the blade 32 is separated from the upper surface of the mask plate 15 by the elevating cylinder 21 (see the squeegee 20 on the right side in FIG. 3), and the lower end of the blade 32 is the upper surface of the mask plate 15. And a contact position (see the squeegee 20 on the left side of the paper shown in FIG. 3). The squeegee 20 is normally positioned at the standby position, and when the paste Pst on the mask plate 15 is scraped, only the squeegee 20 on the side used for scraping the paste Pst is positioned at the contact position. When the squeegee 20 positioned at the contact position is the front squeegee 20, the reciprocating body 17 is moved backward, and the squeegee 20 positioned at the contact position is the rear squeegee 20. (FIG. 3), the reciprocating body 17 is moved forward (arrow A shown in FIG. 3). As a result, the paste Pst on the mask plate 15 is scraped by the paste scraping surface 32a of the blade 32 provided in the squeegee 20 located at the contact position. When the lower end of the blade 32 passes through the opening 16 of the mask plate 15, the opening 16 is filled with the paste Pst. In FIG. 3, the opening 16 filled with the paste Pst is indicated by reference numeral 16A, and the opening 16 not yet filled with the paste Pst is indicated by reference numeral 16B.

  In the state where the lower end of the blade 32 is in contact with the mask plate 15, an attack angle (referred to as a first attack angle θ 1, which is defined by a first attack angle θ 1. FIG. 3) between the paste scraping surface 32 a of the blade 32 and the upper surface of the mask plate 15. This parameter is related to the filling pressure of the paste Pst into the opening 16, and the smaller the value of the first attack angle θ1, the larger the filling pressure of the paste Pst into the opening 16. In the present embodiment, the first attack angle θ1 exhibits the optimum filling pressure for the opening 16 in the first opening region S1, which is the opening region of the mask plate 15 corresponding to the non-fine pitch region R1 of the substrate 2. Is set to a possible value.

  4 (a) and 4 (b), an attachment squeegee 50 (additional squeegee 50) is positioned at the front side of the traveling direction (referred to as the front viewed from the squeegee 20) when the paste Pst of the squeegee 20 is scraped. ) Is attached. The attachment squeegee 50 has an attack angle (second attack angle θ2) different from the attack angle (first attack angle θ1) of the squeegee 20 at a position facing a part of the paste scraping surface 32a of the squeegee 20. The paste Pst is filled. The attachment squeegee 50 is responsible for filling the paste Pst into the opening 16 in the second opening region S2, which is an opening region corresponding to the fine pitch region R2 of the substrate 2.

  4A, 4B, 5A, and 5B, an attachment squeegee 50 includes a base member 51 attached to the squeegee 20, an additional blade member 52 held by the base member 51, 2 It comprises two urging members (a first urging spring 53 and a second urging spring 54) and a fixing screw 55.

  4A, 4B, 5A, and 5B, the base member 51 includes a vertical portion 61 and a vertical portion 61 that extend in the vertical direction on the front surface side of the pressing portion 44 of the blade holding portion 31. A horizontal portion 62 extending rearward from the upper end of the main portion 41 of the blade holding portion 31, a first obliquely extending portion 63 extending obliquely downward and rearward from the lower end of the vertical portion 61, and a first obliquely extending portion 63. A second obliquely extending portion 64 extending rearward and obliquely upward from the lower end and a pair of side wall portions 65 extending rearward from both side portions of the vertical portion 61 are provided. A first locking portion 62 a that protrudes downward is provided at the rear end of the horizontal portion 62, and a second locking portion 61 a that extends obliquely upward rearward is provided at the vertical middle portion of the vertical portion 61. Yes. A screw hole 61b is provided at a position above the second locking portion 61a at the middle portion in the vertical direction of the vertical portion 61, and the fixing screw 55 is screwed into the screw hole 61b.

  5 (a) and 5 (b), the additional blade member 52 includes a base portion 71 covered with a first diagonally extending portion 63, a second diagonally extending portion 64 and a pair of side wall portions 65 of the base member 51, and a base portion. An extending portion 72 extending downward from 71 is provided. The first biasing spring 53 is a first biasing spring provided in the first biasing spring support hole 63 h provided in the first obliquely extending portion 63 of the base member 51 and the base 71 of the additional blade member 52 so as to open forward. The additional blade member 52 is brought into close contact with the paste scraping surface 32a of the blade 32.

  The second biasing spring 54 is provided to open above the second biasing spring support hole 61 h provided in the second locking portion 61 a of the base member 51 and the base 71 of the additional blade member 52. It is contracted between the spring housing hole 71 b and urges downward so that the lower surface of the base 71 of the additional blade member 52 is pressed against the second diagonally extending portion 64 of the base member 51. In a state where the lower surface of the base portion 71 of the additional blade member 52 is in contact with the second obliquely extending portion 64 of the base member 51 from above, the lower end of the additional blade member 52 is positioned at substantially the same height as the lower end of the blade 32. As described above, in the present embodiment, the second biasing spring 54 is provided between the base member 51 and the additional blade member 52 and biases the additional blade member 52 below the base member 51. It has become.

  The attachment squeegee 50 is configured such that the first locking portion 62a of the base member 51 is positioned in the first locking groove 41m and the second locking portion 61a is positioned in the second locking groove 44m, whereby the blade holding portion The posture with respect to 31 is maintained. On the other hand, the attachment squeegee 50 is slidable in the X-axis direction with respect to the blade holding portion 31, is detachable with respect to the squeegee 20, and can change the position with respect to the squeegee 20. With the attachment squeegee 50 positioned with respect to the squeegee 20, the fixing screw 55 is screwed into the screw hole 61 b, and the tip of the fixing screw 55 is pressed against the front surface of the holding portion 44, thereby attaching the attachment squeegee 50 to the blade holding portion 31. Can be fixed against.

  When the squeegee 20 with the attachment squeegee 50 attached is lowered from the standby position, the lower end of the extension 72 of the additional blade member 52 first comes into contact with the mask plate 15. The squeegee 20 continues to descend while pressing and contracting the second urging spring 54, and the squeegee 20 is positioned at the contact position when the lower end of the blade 32 contacts the mask plate 15 (FIG. 6). In this state, the front surface of the extension portion 72 of the additional blade member 52 (referred to as the extension portion front surface 72a) is a surface that scrapes the paste Pst instead of the blade 32 on the front surface side of the blade 32. In addition, the surface of the extended portion front surface 72 a that includes the lower end of the extended portion 72 that contacts the upper surface of the mask plate 15 and faces the upper surface of the mask plate 15 pushes the paste Pst into the opening 16 of the mask plate 15. This surface is referred to as an additional blade side paste filling surface 72b.

  The attack angle (second attack angle θ2) formed by the additional blade side paste filling surface 72b and the upper surface of the mask plate 15 with the lower end of the additional blade member 52 in contact with the mask plate 15 is the paste to the opening 16 It is a parameter related to the filling pressure of Pst. The smaller the value of the second attack angle θ2, the larger the filling pressure of the paste Pst into the opening 16.

  As described above, since the attachment squeegee 50 is responsible for filling the paste Pst into the opening 16 constituting the second opening region S2, which is the opening region corresponding to the fine pitch region R2, the paste of the squeegee 20 is used. Of the scraping surface 32a, it is attached to a portion passing above the opening (opening in the second opening region S2) filled with the paste Pst with a higher filling pressure than the squeegee 20. The second attack angle θ2 of the attachment squeegee 50 is smaller than the first attack angle θ1 of the squeegee 20 so that the optimum filling pressure can be exerted on the opening 16 in the second opening region S2. Is set to

  As described above, the attachment squeegee 50 according to the present embodiment includes the base member 51 attached to the squeegee 20 and the additional blade member 52 held by the base member 51, and the squeegee 20 slides with respect to the mask plate 15. When this is done, the additional blade member 52 fills the paste Pst with an attack angle (second attack angle θ2) different from the attack angle (first attack angle θ1) of the squeegee 20.

  Next, the procedure of the screen printing method for printing the paste Pst on the substrate 2 by the screen printing apparatus 1 will be described. First, the attachment squeegee 50 is attached to each of the two squeegees 20 included in the screen printing apparatus 1. Specifically, the attachment squeegee 50 is an opening 16 (an opening region corresponding to the fine pitch region R2) filled with the paste Pst with a higher filling pressure than the squeegee 20 in the paste scraping surface 32a of the squeegee 20. It is attached to a portion passing above the opening 16) in the second opening region S2.

  In the present embodiment, since the mask plate 15 has two second opening regions S2 in the X-axis direction (the direction in which the squeegee 20 extends), both squeegees 20 correspond to the two second opening regions S2. The attachment squeegee 50 is attached to (Fig. 7). At this time, the attachment squeegee 50 is attached so as to cover the width dimension D (FIG. 7) in the X-axis direction of the second opening region S2 provided in the mask plate 15. Two or more attachment squeegees 50 may be adjacent to the longitudinal direction (X-axis direction) of the squeegee 20 so as to cover the width dimension D of one second opening region S2. Although FIG. 7 shows only the attachment squeegee 50 attached to one squeegee 20, the attachment squeegee 50 is attached to the other squeegee 20 in the same manner.

  When the attachment squeegee 50 is attached to each of the two squeegees 20 included in the screen printing apparatus 1, the screen printing apparatus 1 is operated. In the screen printing apparatus 1, the substrate 2 is carried in by the carry-in conveyor 11 and transferred to the intermediate conveyor 12, and then the substrate holding and moving unit 14 holds the substrate 2. Then, the substrate 2 is moved in the horizontal plane direction and the vertical direction, and the substrate 2 is brought into contact with the lower surface of the mask plate 15 so that the electrode 2d of the substrate 2 matches the opening 16 of the mask plate 15 (substrate contact process).

  When the screen printing apparatus 1 brings the substrate 2 into contact with the mask plate 15, one of the squeegees 20 is lowered by the elevating cylinder 21 and the lower end thereof is brought into contact with the upper surface of the mask plate 15. As a result, the lower end of the additional blade member 52 of the attachment squeegee 50 attached to the lowered squeegee 20 also comes into contact with the upper surface of the mask plate 15.

  The screen printing apparatus 1 operates the reciprocating body moving mechanism 18 to move the reciprocating body 17 in the Y-axis direction. As a result, the squeegee 20 and the attachment squeegee 50 attached to the squeegee 20 slide on the mask plate 15 in contact with the substrate 2 and scrape the paste Pst previously supplied on the mask plate 15 on the mask plate 15. As a result, the opening 16 in the first opening region S1 of the mask plate 15 is filled with the paste Pst by the blade 32 of the squeegee 20 at the first attack angle θ1, and the opening in the second opening region S2 of the mask plate 15 is performed. 16 is filled with the paste Pst at the second attack angle θ2 by the additional blade member 52 of the attachment squeegee 50 (paste filling step, FIGS. 3 and 6).

  In the present embodiment, in the paste filling step, the additional blade member 52 of the attachment squeegee 50 is urged downward by the second urging spring 54, and the additional blade member 52 is in close contact with the upper surface of the mask plate 15. Since the state is maintained, the attachment squeegee 50 exhibits an intended filling pressure.

  When the paste Pst is filled in the opening 16 in the first opening region S1 and the opening 16 in the second opening region S2 of the mask plate 15 as described above, the screen printing apparatus 1 moves the substrate holding / moving unit 14 over. By actuating, the substrate 2 is separated from the mask plate 15 (plate separation). Then, the substrate 2 is transferred from the intermediate conveyor 12 to the carry-out conveyor 13, and the substrate 2 is carried out from the carry-out conveyor 13 to the apparatus on the downstream process side.

  As described above, in the screen printing apparatus 1 and the screen printing method in the present embodiment, the attack angle (first attack angle θ1) of the squeegee 20 is located at a position facing a part of the paste scraping surface 32a of the squeegee 20. The paste filling step is executed in a state in which the attachment squeegee 50 having an attack angle (second attack angle θ2) different from () is attached. Therefore, the paste Pst is applied at an appropriate filling pressure to each of the plurality of opening regions (first opening region S1 and second opening region S2) arranged in the longitudinal direction of the squeegee 20 and having different filling pressures of the paste Pst. Can be filled.

  For example, as shown in the above-described embodiment, the opening 16 provided in the mask plate 15 is not aligned with the longitudinal direction (X-axis direction) of the squeegee 20 perpendicular to the sliding direction (Y-axis direction) of the squeegee 20. If there is a first opening region S1 corresponding to the fine pitch region R1 and a second opening region S2 corresponding to the opening region corresponding to the fine pitch region R2, the first opening region S1 is the first opening region S1. The paste Pst is filled with an appropriate filling pressure by a squeegee 20 having an attack angle θ1, and the paste Pst is filled with an appropriate filling pressure by an attachment squeegee 50 having a second attack angle θ2 for the second opening region S2. Can be filled.

  Further, in the screen printing apparatus 1 according to the above-described embodiment, the attachment squeegee 50 is detachably attached to the squeegee 20, so that the attachment squeegee 50 only needs to be attached to the squeegee 20 and the existing squeegee 20 is used. be able to. Further, since the attachment squeegee 50 can be exchanged with another attachment squeegee 50 having a different value of the second attack angle θ2, it corresponds to the density of the electrodes 2d in the fine pitch region R2 corresponding to the second opening region S2. If the attachment squeegee 50 having the second attack angle θ2 is prepared, an appropriate paste Pst can be printed regardless of the density of the electrodes 2d of the substrate 2. Furthermore, since the attachment squeegee 50 can be slid in the longitudinal direction of the squeegee 20 to change the position of the attachment squeegee 20, the positioning of the attachment squeegee 50 with respect to the squeegee 20 is easy and the workability is excellent.

  Provided are a screen printing apparatus and a screen printing method capable of filling a paste with an appropriate filling pressure in each of a plurality of opening regions having different paste filling pressures.

DESCRIPTION OF SYMBOLS 1 Screen printing apparatus 2 Board | substrate 15 Mask plate 20 Squeegee 32a Paste scraping surface 50 Attachment squeegee (additional squeegee)
S1 First opening region (opening region)
S2 Second opening region (opening region)
Pst paste

Claims (7)

By sliding on the mask plate in contact with the substrate and on the mask plate in contact with the substrate, and scraping the paste on the mask plate on the paste scraping surface, an opening region provided in the mask plate is formed. A screen printing apparatus comprising a squeegee for filling a paste,
A screen printing apparatus, wherein an additional squeegee having an attack angle different from the attack angle of the squeegee is attached at a position facing a part of the paste scraping surface.   The additional squeegee is attached to a portion of the paste scraping surface that passes above the opening area where the paste is filled with a higher filling pressure than the squeegee, and the attack angle of the additional squeegee is that of the squeegee. The screen printing apparatus according to claim 1, wherein the screen printing apparatus is set to a value smaller than an attack angle.   The screen printing apparatus according to claim 1, wherein the additional squeegee is detachably attached to the squeegee.   The screen printing apparatus according to claim 1, wherein the additional squeegee can be replaced with another additional squeegee having a different attack angle.   The screen printing apparatus according to claim 1, wherein the position of the additional squeegee can be changed by sliding the additional squeegee in a longitudinal direction of the squeegee. A substrate contacting step for contacting the substrate with the mask plate; and sliding the squeegee on the mask plate in contact with the substrate, and scraping the paste on the mask plate on the paste scraping surface of the squeegee. A screen printing method including a paste filling step of filling a paste in an opening area provided in a plate,
A screen printing method, wherein the paste filling step is performed in a state where an additional squeegee having an attack angle different from the attack angle of the squeegee is attached at a position facing a part of the paste scraping surface.   The additional squeegee is attached to a portion of the paste scraping surface that passes above the opening region where the paste is filled with a higher filling pressure than the squeegee, and the additional squeegee has an attack angle of the additional squeegee. The screen printing method according to claim 6, wherein the screen printing method is set to a value smaller than the attack angle.

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