JP2009298116A - Printing method and screen printing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To excellently print a paste regardless of the presence or absence oof a through-hole. <P>SOLUTION: A screen printing apparatus spreads paste while moving a squeeze along a mask sheet. The printing apparatus has a control part body 51 including a main control part 511, a printing condition set part 512 and a storage part 513 or the like. The printing condition set part 512 sets an independent printing condition to a first kind substrate having the through-hole and a second kind substrate having no through-hole using the contact angle and contact pressure of the squeeze 6a as the printing condition. The main control part 511 controls the driving of a printing head 6 or the like corresponding to the printing condition. The printing condition part 512 sets each printing condition so that a value of directional component parallel to the thickness directional component of the substrate in the direction component of force acted on the paste through the squeeze 6a is made larger in the printing of the first kind substrate than that in the second kind substrate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a screen printing apparatus for applying paste such as cream solder to a substrate such as a printed circuit board.

  Conventionally, a printed circuit board (PCB) or the like and a mask sheet are overlaid, and paste such as cream solder or conductive paste supplied on the mask sheet is moved to the mask sheet while being moved by a squeegee. There is known a screen printing apparatus configured to apply (print) on a substrate through a printing opening (mask opening) to be formed.

With conventional screen printing equipment, it is possible to print on a circuit board that does not have a through-hole while ensuring a predetermined print quality, but through-holes for mounting leaded components such as circuit boards DIP, PGA, ZIP, etc. In the case of printing on a circuit board having the above, there is a problem that the paste is not sufficiently filled in the through hole, which causes a contact failure of a component with a lead later. In order to solve this problem, there has been proposed a printing apparatus that applies a negative pressure to a substrate through a support table of the substrate and draws paste into a through hole by this negative pressure (Patent Document 1).
Japanese Patent No. 2558775

  However, such a configuration is not meaningful for a circuit board having no through-holes, and causes a significant increase in cost. In addition, even with such a device having a paste suction function, for example, if the number and size (diameter) of through holes vary depending on the type of substrate, it may be possible to receive paste filling properties as expected.

  The present invention has been made in view of the circumstances as described above, and an object of the present invention is to allow a paste to be printed satisfactorily without incurring a significant increase in cost regardless of the presence or absence of a through hole. is there.

  In order to solve the above-described problems, the printing method of the present invention causes a squeegee to abut against a mask sheet on which a substrate is overlaid with a predetermined contact angle and pressing force, and moves the squeegee along the mask sheet. In the printing method of applying a predetermined paste on the substrate through the printing opening of the mask sheet while moving the predetermined paste on the mask sheet by the squeegee, printing at least one of the contact angle or the pressing force of the squeegee As a condition, printing is performed by setting individual printing conditions for the first type substrate having a through hole and the second type substrate having no through hole, and the direction component of the force acting on the paste through the squeegee. The printing conditions are set so that the size of the direction component parallel to the thickness direction of the substrate is larger at the time of printing the first type substrate than at the time of printing the second type substrate. It is obtained as a constant.

  According to this printing method, when performing the printing process on the first type substrate, the direction component parallel to the thickness direction of the substrate to be printed out of the direction component of the force acting on the paste is applied to the second type substrate. As compared with the same component when applied, the paste filling property to the through hole is enhanced. Therefore, the paste filling property to the through hole of the first type substrate can be improved while printing on both the first and second type substrates in a common printing apparatus, and as a result, the first type substrate is obtained. In addition, it is possible to perform good printing on both the second type substrate and the second type substrate.

  On the other hand, a screen printing apparatus according to the present invention includes a printing head that is equipped with a squeegee and is relatively movable along a mask sheet on which a substrate is overlaid, and a head driving unit that drives the printing head. For printing the mask sheet while moving the predetermined paste with the squeegee by bringing the squeegee into contact with the mask sheet with a predetermined contact angle and pressing force and moving along the mask sheet. In a screen printing apparatus for coating on a substrate through an opening, the first type substrate and the second type are selected depending on whether the substrate to be printed is a first type substrate having a through hole or a second type substrate having no through hole. And a control means for controlling the head driving means according to printing conditions individually determined for the substrate. A dynamic rate, in which are defined as than when printing a second type substrate is more at the time of printing of the one substrate becomes slow.

  According to this printing apparatus, when the printing process is performed on the first type substrate, the pressing time of the paste against the mask sheet per unit movement amount of the squeegee is longer than the same time when the printing process is performed on the second type substrate. Also gets longer. Further, when the first type substrate is subjected to the printing process, the influence of the inertia in the squeegee moving direction of the paste moving through the land portion having no opening is reduced, and the paste filling property to the through hole is improved. The paste filling property to the through hole is improved. Therefore, the paste filling property to the through hole of the first type substrate can be improved while printing on both the first and second type substrates in a common printing apparatus, and as a result, the first type substrate is obtained. In addition, it is possible to perform good printing on both the second type substrate and the second type substrate.

  Further, another screen printing apparatus according to the present invention includes a printing head equipped with a squeegee and provided relatively movable along a mask sheet on which a substrate is overlaid, and a head for driving the printing head. A squeegee driving means for changing a contact angle of the squeegee with respect to the mask sheet by driving the squeegee, and a pressing force of the squeegee against the mask sheet by relatively displacing the mask sheet and the squeegee in the vertical direction. At least one of the pressing force changing drive means for changing the squeegee, bringing the squeegee into contact with the mask sheet at a predetermined contact angle and pressing force, and moving the squeegee along the mask sheet, While being moved by the squeegee, the coating applied onto the substrate through the printing opening of the mask sheet. In the lean printing apparatus, printing determined individually for the first-type substrate and the second-type substrate depending on whether the substrate to be printed is a first-type substrate having a through-hole or a second-type substrate having no through-hole. Control means for controlling the driving means in accordance with conditions, wherein the printing condition is at least one of the contact angle and the pressing force, and is greater when printing the first type substrate than when printing the second type substrate. The contact angle is determined to be smaller or / and the pressing force is determined to be larger when printing the first type substrate than when printing the second type substrate. It is.

  According to this screen printing apparatus, when performing the printing process on the first type substrate, the direction component parallel to the thickness direction of the substrate to be printed among the direction components of the force acting on the paste is printed on the second type substrate. As a result, the paste filling property with respect to the through hole is improved. Therefore, the paste filling property to the through hole of the first type substrate can be improved while printing on both the first and second type substrates in a common printing apparatus, and as a result, the first type substrate is obtained. In addition, it is possible to perform good printing on both the second type substrate and the second type substrate.

  In this screen printing apparatus, the printing condition further includes a moving speed of the squeegee, and the moving speed is determined to be slower when printing the first type substrate than when printing the second type substrate. It may be.

  According to this configuration, the pressing time of the paste against the mask sheet per unit movement amount of the squeegee when performing the printing process on the first type substrate becomes longer than the same time when performing the printing process on the second type substrate. As a result, the paste filling property to the through hole is improved. Further, when the first type substrate is subjected to the printing process, the influence of the inertia in the squeegee moving direction of the moving paste in the land portion having no opening is reduced, and the paste filling property to the through hole is enhanced.

  In the screen printing apparatus as described above, it is preferable that the printing condition of the first type substrate is set based on a parameter related to the filling property of the paste with respect to the through hole.

  Specifically, the parameter is at least one of a through-hole diameter, a substrate thickness, and a paste viscosity, and the printing condition of the first type substrate is that the substrate thickness decreases as the through-hole diameter decreases. The thicker the paste is, the higher the viscosity of the paste is.

  According to this configuration, printing is performed in accordance with the specific configuration of the first type substrate, that is, the printing conditions in consideration of the through-hole diameter, the substrate thickness, and the paste viscosity. Therefore, it is possible to perform printing in accordance with user's needs and other desired printing conditions according to various circumstances.

  When the parameters include a plurality of parameters among through-hole diameter, substrate thickness, and paste viscosity, the printing conditions for the first type substrate are set according to weighting data set in advance for the plurality of parameters. It is suitable.

  According to this configuration, printing is performed according to printing conditions that place importance on specific elements among the through-hole diameter, the substrate thickness, and the viscosity of the paste. Therefore, it is possible to perform printing in accordance with user's needs and other desired printing conditions according to various circumstances.

  The screen printing apparatus includes at least one of a storage unit that is provided in the printing apparatus main body and stores the printing conditions, and an interface unit that is provided in the printing apparatus main body and takes in the printing conditions from outside the main body. The control unit may control the driving unit based on the printing condition stored in the storage unit or the printing condition taken in via the interface unit. The main body includes a printing condition setting unit that sets the printing condition of the first type substrate. When the printing target substrate is the first type substrate, the control unit sets the printing set by the printing condition setting unit. The driving means may be controlled based on conditions.

  The screen printing apparatus includes a type detection unit that detects whether the substrate is the first type substrate or the second type substrate from identification information provided on the print target substrate, and the control unit includes the type detection unit. It is preferable that the driving unit is controlled in accordance with a printing condition corresponding to the type detected by.

  According to this configuration, it is possible to automate a series of printing operations including determination as to whether the substrate to be printed is the first type substrate, which is effective in increasing the productivity of the substrate. Here, “identification information” means various types of information for recognizing a substrate attached to or incorporated in a substrate to be printed, such as an ID number / mark attached to the substrate.

  In addition, the control means may include board type data input via an input means provided in the printing apparatus main body, or a board type input from outside the printing apparatus main body via an interface means provided in the printing apparatus main body. It may be determined whether the substrate to be printed is the first type substrate or the second type substrate based on the data, and the driving unit is controlled according to the printing condition corresponding to the type.

  Further, in the above screen printing apparatus, a plurality of conditions including at least one of the contact angle of the squeegee, the pressing force, and the moving speed of the squeegee are used as the printing conditions for the first type substrate. In the case of the first type substrate, it is preferable that the control unit controls the driving unit in accordance with the printing conditions set based on weighting data set in advance for the plurality of printing conditions.

  According to this configuration, printing is performed according to printing conditions in which particular elements are emphasized among the contact angle of the squeegee, the contact pressure, and the moving speed of the squeegee. Therefore, it is possible to perform printing in accordance with user's needs and other desired printing conditions according to various circumstances.

  In addition, when the printing process is repeated and the paste on the mask sheet is consumed, it is conceivable that the filling property of the paste with respect to the through hole is reduced accordingly. Therefore, the screen printing apparatus further includes a paste amount detection unit capable of detecting the current paste amount on the mask sheet during printing of the first type substrate, and based on a detection result by the paste amount detection unit. It is preferable that the control means controls the driving means according to the printing condition to be changed.

  According to this configuration, it is possible to avoid the above-described inconvenience that the filling property of the paste with respect to the through hole is reduced as the paste is consumed, and the print quality of the first type substrate can be maintained more stably for a longer period of time. It becomes possible to do.

  Further, in the above screen printing apparatus, the control unit includes a first region in which a substrate to be printed is a first type substrate and includes a through hole as a region to be printed, and a second region that does not include a through hole. And, when these areas are arranged in the moving direction of the squeegee, the second area is based on the first printing condition for the first type substrate having the through hole for the first area of the board. Preferably, the driving means is controlled to perform printing based on the second printing condition for the second type substrate having no through hole.

  According to this configuration, it is possible to print the region including the through hole and the other region in one sheet of the first type substrate in accordance with different printing conditions. Compared with printing in accordance with the same printing conditions, it is possible to further improve the print quality of the entire substrate.

  According to the present invention, it is possible to perform printing on both the first-type substrate having a through hole and the second-type substrate having no through hole with a common printing apparatus, and also has a negative pressure suction function. Without providing a special device, it is possible to improve the paste filling property with respect to the through hole when the first type substrate is printed. Therefore, it is possible to print the paste satisfactorily on both the first-type and second-type substrates regardless of the presence or absence of through holes and without incurring a significant increase in cost.

  A preferred embodiment of the present invention will be described with reference to the drawings.

<First Embodiment>
1 and 2 schematically show a screen printing apparatus according to the present invention (a printing apparatus in which a printing method according to the present invention is used), and FIG. 2 is a front view, each showing a screen printing apparatus. In the drawings used in this description including this figure, XYZ rectangular coordinate axes are shown in order to clarify the directional relationship.

  As shown in these drawings, on the base 1 of the screen printing apparatus, a carry-in conveyor 2a and a carry-out conveyor 2b are arranged in the Y-axis direction with a print stage 3A interposed therebetween, and a printed circuit board or the like. The substrate to be printed W (hereinafter abbreviated as “substrate W”) is carried into the printing stage 3A by the carry-in conveyor 2a, and after being subjected to printing processing, is carried out by the carry-out conveyor 2b. .

  A 4-axis unit 10 is disposed on the printing stage 3A. The 4-axis unit 10 supports the substrate W, and positions and overlaps the substrate W with respect to the mask sheet 4 described later from the lower side thereof. The substrate W loaded by the carry-in conveyor 2a is horizontally disposed. And are displaceably supported in each direction of the X axis, Y axis, Z axis, and R axis (around the Z axis).

  More specifically, the four-axis unit 10 is supported by a fixed table 11 fixed on the base 1, and is movably supported in the X-axis direction relative to the fixed table 11, and a servo motor is driven by An X-axis table 12 driven by a ball screw mechanism or the like, and a ball screw mechanism or the like that is supported so as to be movable in the Y-axis direction relative to the X-axis table 12 and also uses a servo motor as a drive source. A driven Y-axis table 13, an R-axis table 14 supported on the Y-axis table 13 so as to be rotatable about the Z-axis and driven by a servo motor, and supported so as to be movable up and down with respect to the R-axis table 14 And a lift table 15 driven by a ball screw mechanism or the like using a servo motor as a drive source. Then, by supporting the substrate W by the support unit 16 provided on the elevating table 15, the substrate W is made to be X-axis, Y-axis, Z-axis and the like according to the driving of the tables 12, 13, 14, and 15. It can be moved to any position in the R-axis (around the Z-axis) direction.

  The support unit 16 is provided on the elevating table 15 and supports the substrate W so as to be movable in the Y-axis direction. The support unit 16 is provided on the elevating table 15 via the conveyor 19 and can be projected and retracted in the Z-axis direction. And a support mechanism 17 that supports the substrate W by avoiding the through-hole Wa (see FIG. 12) by the support pins, and is also provided on the lifting table 15 via the conveyor 19 to clamp the substrate W. And a clamping mechanism 18 for That is, when the substrate W is loaded onto the conveyor 19 of the support unit 16 from the carry-in conveyor 2a, the support unit 16 protrudes the support pins of the support mechanism 17 to bring the substrate W from the lower side (back side). In addition to supporting, the clamp mechanism 18 clamps the substrate W from both sides in the X-axis direction, thereby positioning and fixing the substrate W with respect to the lifting table 15.

  An inspection stage 3B is provided on the side of the printing stage 3A (on the right side in FIG. 1) on the base 1, and the 4-axis unit 10 is connected to the printing stage 3A by driving the X-axis table 12. It is provided to be movable between this inspection stage 3B.

  An imaging unit 8 is provided in the inspection stage 3B. The imaging unit 8 includes a camera 8a (shown in FIG. 5) on which an imaging element such as a CCD area sensor is mounted, an illumination device 8b (shown in FIG. 5) having an illumination light source such as an LED, and the like.

  The imaging unit 8 is disposed above the inspection stage 3B so that the imaging direction is downward. When the four-axis unit 10 is disposed on the inspection stage 3B, the substrate supported by the support unit 16 is provided. The printing surface of W is imaged from the upper side, and the image signal is output to the control device 50 described later.

  Further, the imaging unit 8 images not only the inspection of the substrate W after printing but also images fiducial marks at a plurality of locations on the substrate W before printing, and further images the identification ID and the like of the substrate W. When the substrate W is overlaid on the mask sheet 4, a plurality of fiducial marks are imaged, while a plurality of alignment marks corresponding to the mask sheet 4 are imaged with a camera (not shown). The unit 10 moves the substrate W in the X-axis, Y-axis, Z-axis, and R-axis (around the Z-axis) directions and aligns with the mask sheet 4. In addition, the imaging unit 8 captures the identification ID of the substrate W, thereby classifying whether the substrate W is a first type substrate having a through hole Wa or a second type substrate having no through hole Wa. Detection is possible in the screen printing apparatus itself. That is, in this case, the imaging unit 8 or the like constitutes a type detection unit according to the present invention.

  A mask sheet 4 having a printing opening 4a (see FIG. 12) is stretched above the printing stage 3A, and a conductive material such as paste (cream solder, conductive paste) is provided above the mask sheet 4. A printing head 6 for moving along the mask sheet 4 while expanding the binder) is provided.

  The print head 6 (hereinafter simply referred to as the head 6) is supported so as to be movable in the X-axis direction and the Z-axis direction, and is driven by a servo motor.

  Specifically, a pair of fixed rails 7 extending in the X-axis direction are provided above the mask sheet 4, and the head support member 5 is horizontally mounted across the fixed rails 7 and is movable with respect to the fixed rails 7. And is driven by a ball screw mechanism (not shown) using the servo motor 60 as a drive source. The servo motor 60 serves as a head driving means for moving the head 6 in the X-axis direction according to the present invention. The head support member 5 is provided with a fixed rail 22 in the Z-axis direction, and the head 6 is movably mounted on the fixed rail 22 and connected to a ball screw 24 driven by a servo motor 23. Yes. With this configuration, the head 6 moves in the X-axis direction integrally with the head support member 5 by driving the servo motor (not shown), while the head 6 moves Z with respect to the head support member 5 by driving the servo motor 23. It is configured to move in the axial direction. As will be described later, the servo motor 23 raises and lowers the squeegee 6a during printing, and makes the contact pressure of the squeegee 6a with respect to the mask sheet 4 variable. Become.

  The head 6 is equipped with a squeegee 6a. The squeegee 6a moves the paste along the mask sheet 4, and is pressed onto the mask sheet 4 as the head 6 moves in the Z-axis direction with respect to the head support member 5. In this state, the head support member 5 is pressed. With the movement, the paste on the mask sheet 4 is moved along the sheet 4 while being expanded in the X-axis direction by moving together with the head 6 in the X-axis direction.

  3 and 4 show a specific configuration of the head 6, FIG. 3 is a perspective view, and FIG. 4 shows the head 6 in a front view (viewed in the direction of arrow A in FIG. 3).

  As shown in these drawings, the head 6 has a main frame 20 and is supported by the head support member 5 via the frame 20. An arm member 25 having an inverted L-shaped cross section is fixed to the frame 20, and a support portion 28 of the squeegee 6 a is suspended from the arm member 25 via a load sensor 26. The load sensor 26 is composed of, for example, a load cell. As will be described later, when the squeegee 6a comes into contact with the mask sheet 4 as the head 6 descends, the ground reaction force is detected as an input load, and the load sensor 26 corresponds to the load. The electrical signal is output to the control device 50 described later.

  A subframe 30 is swingably supported by the support portion 28. Specifically, a first support shaft 29 extending in the X-axis direction is provided on the support portion 28, and the sub frame 30 is rotatably supported by the first support shaft 29 via a bearing or the like.

  The subframe 30 is equipped with a unit assembly member 32 and a drive mechanism for rotationally driving the unit assembly member 32.

  The unit assembling member 32 is a plate-like member extending in the Y-axis direction, and is rotatably supported by the subframe 30 via an arm portion 32a provided at a midway portion in the longitudinal direction. Specifically, a second support shaft 34 extending in the Y-axis direction is supported with respect to the subframe 30 so as to be rotatable around the axis, and the arm portion 32 a is supported by the second support shaft 34. It is fixed. With this configuration, the unit assembly member 32 is supported with respect to the subframe 30 so as to be swingable about an axis parallel to the Y axis.

  The second support shaft 34 passes through the subframe 30 and protrudes to the opposite side (opposite side of the arm portion 32a: left side in FIG. 3), and the gear 44 is fixed to the protruding portion. A servo motor 40 as a drive source is fixed to the subframe 30, and a drive gear 41 attached to the output shaft of the motor 40 is connected to the gear 44 via intermediate gears 42 and 43 supported by the subframe 30. Meshed with each other. That is, when the servo motor 40 is operated, the rotational driving force is transmitted to the second support shaft 34 via the gears 41 to 44, whereby the unit assembly member 32 is rotationally driven integrally with the second support shaft 34. It has a configuration. That is, the servo motor 40 is a squeegee driving means of the present invention.

  A squeegee unit 45 is assembled to the unit assembly member 32. The squeegee unit 45 includes a squeegee 6a and a squeegee holder 46 that holds the squeegee 6a.

  Although not shown in detail, the squeegee unit 45 is superimposed on the unit assembly member 32 in a state where a pair of screw shafts provided in the squeegee holder 46 is passed through the guide grooves 32b formed in the unit assembly member 32. The nut assembly 48 is screwed and attached to the screw shaft so as to be detachably fixed to the unit assembly member 32. In FIG. 4, the nut member 48 is not shown for convenience.

  The squeegee 6a is a rectangular plate-like member elongated in the Y-axis direction and made of, for example, hard urethane or stainless steel, and is superimposed on the squeegee holder 46, which is also elongated in the Y-axis direction, as shown in FIG. And is fixed to the holder 46. Side leakage prevention plates 47 are provided at both ends in the longitudinal direction of the squeegee holder 46. During printing, the lateral leakage prevention plates 47 prevent lateral leakage of paste to the side of the squeegee 6a (outside in the Y-axis direction). It is configured to prevent. Each side leakage prevention plate 47 can rotate about an axis parallel to the Y axis with respect to the squeegee holder 46 and is elastically held at a neutral position (see FIG. 4) with respect to the squeegee 6a. With this configuration, the side leakage prevention plate 47 can be slid along the mask sheet 4 without any gap during printing regardless of the contact angle of the squeegee 6a with the mask sheet 4.

  In this screen printing apparatus, after the substrate W is supported by the support unit 16 and the substrate W is superimposed on the mask sheet 4 in accordance with the operation of the four-axis unit 10, the substrate W is printed as follows. Is advanced.

  First, the head 6 is disposed above a predetermined work start position at one end in the X-axis direction of the mask sheet 4, and the squeegee unit 45 is rotationally driven integrally with the unit assembly member 32 by the operation of the servo motor 40. As a result, the squeegee 6a is set in a state of being bent forward (acute angle) toward the traveling direction. For example, in FIG. 4, when the traveling direction is the right side, the squeegee 6a is set in a state where it is tilted forward and bent to the right as shown by the solid line in FIG. At this time, the squeegee 31 is set to a predetermined attack angle. The attack angle is a contact angle of the squeegee 6a with respect to the mask sheet 4, that is, an inclination angle of the squeegee 6a with respect to the mask sheet 4 when the squeegee 6a is brought into contact with the mask sheet 4 (see symbol R in FIG. 4).

  Next, the head 6 is lowered with respect to the head support member 5, and the edge portion of the squeegee 6 a is pressed against the work start position on the mask sheet 4. At this time, the head 6 is driven and controlled in accordance with the output from the load sensor 26, so that the squeegee 6a is controlled by the preset pressing force (the squeegee 6a is driven by the driving force of the servo motor 23 via the mask sheet 4). ) A value obtained by dividing the pressing force (a downward force in the Z-axis direction, which can be detected by the load sensor 26) by the substrate W by the contact length of the squeegee 6a that contacts the mask sheet 4 by line contact. ) Is pressed against the mask sheet 4. A part of the pressing force opposes the elastic force that holds the side leakage prevention plate 47, and not all of the pressing force acts on the tip of the squeegee 6a, but the elastic force is small in comparison and can be ignored for control.

  When the squeegee 6a is pressed against the mask sheet 4 in this way, the paste is supplied onto the mask sheet 4 by a supply device (not shown) or manually by an operator.

  When the head support member 5 is driven, the head support member 5 and the head 6 are integrally moved in the X-axis direction, and the paste is printed on the substrate W along with this movement (forward movement). More specifically, as the head 6 moves in the X-axis direction, the paste moves along the mask sheet 4 while being pressed by the squeegee 6 a, and thereby the substrate W passes through the printing opening 4 a formed in the mask sheet 4. The paste will be applied on top.

  When the squeegee 6a reaches a predetermined work end position, after the head 6 is lifted, the inclination direction of the squeegee 6a is switched as shown by the two-dot chain line in FIG. The substrate W is replaced by the operation of the four-axis unit 10.

  When the next substrate W is mounted on the mask sheet 4, the squeegee 6 a is pressed onto the mask sheet 4 and then the head support member 5 is driven, and the squeegee 6 a is attached to the mask sheet 4 in the same manner as described above. The paste is applied on the substrate W by moving (returning) along the direction, and then the tilt direction of the squeegee 6a is switched and the substrate W is replaced.

  Thus, thereafter, the head 6 reciprocates along the mask sheet 4 while the direction of the squeegee 6a is reversed, so that paste is sequentially applied (printed) onto the substrate W.

  The screen printing apparatus is provided with a control device 50 as shown in FIG. 5 that comprehensively controls the printing operation by the head 6 and the like as described above.

  The control device 50 includes a control unit main body 51, an input means 58 such as a keyboard / mouse, a display means 59 such as an LCD monitor, a motor control circuit 61, an image processing circuit 62, an illumination control circuit 63, and the like. And it is connected with the external storage device 57 etc. via LAN etc.

  The control unit main body 51 includes various CPUs such as a well-known CPU 52 that executes logical operations, a ROM 53 that stores various programs for controlling the CPU 52 in advance, a RAM 54 that temporarily stores various data during operation of the apparatus, an OS, and the like. An HDD 55 and an I / O controller (IOC) 56 that store programs and various data related to the substrate to be printed W and paste are provided, and the CPU 62 and the like are connected to each other via an internal bus.

  The input means 58 and the display means 59 are connected to the IOC 56 (corresponding to the interface means according to the present invention), the motor control circuit 61 such as the servo motors 23 and 40, the image processing circuit 62 of the camera 8a, the illumination. The illumination control circuit 63 of the device 8b is connected. Then, in accordance with a command from the CPU 52, the input of various control signals and various data between the control circuit 61 and the control unit main body 51 is controlled by the IOC 56, so that the operation of the head 6 and the 4-axis unit 10 is performed. The control unit 51 is controlled in a centralized manner.

  In the figure, only the motors 23 and 40 are shown as a servo motor for convenience. Various other servo motors such as a servo motor for driving each table of the 4-axis unit 10, a servo motor for driving a head support member, etc. Is omitted.

  FIG. 6 schematically shows, in a block diagram, a part mainly related to the present invention, that is, a part related to setting of printing conditions, among the functional configurations included in the control unit main body 51. As shown in the figure, the control unit main body 51 includes a main control unit 511, a printing condition setting unit 512, a storage unit 513, and the like as its functional configuration.

  The main control unit 511 (corresponding to the control means according to the present invention) comprehensively controls the servo motor 40 and the like via the motor control circuit 61 so as to execute a predetermined printing operation in accordance with a program stored in advance. Various determinations, calculations, and the like are performed in accordance with input information based on the operation of the input means 58.

  The printing condition setting unit 512 (corresponding to the printing condition setting unit according to the present invention) sets printing conditions corresponding to the type of the substrate W based on the data stored in the storage unit 513. The driving of the head 6 and the like is controlled according to the printing conditions set here.

  The storage unit 513 stores various data such as substrate related data, paste related data, and printing condition data.

  The substrate-related data is various data for each substrate to be printed, and includes, for example, the size, shape (thickness), printing position (coordinates), type of paste to be printed, presence / absence of through hole Wa, and the like. The substrate having the hole Wa further includes through hole Wa related data such as the size (diameter) of the through hole Wa and the necessity of printing. The paste-related data includes data such as paste properties (main components and viscosity), production lots, and the like.

  The printing condition data is a driving condition of the head 6 or the like at the time of printing. In this embodiment, two types of printing condition data are stored. Specifically, printing condition (hereinafter referred to as first printing condition) data for a substrate W having a through hole Wa (hereinafter referred to as a first type substrate) and a substrate W (without a through hole Wa) ( Hereinafter, printing condition (hereinafter referred to as a second printing condition) data for a second type substrate) is stored.

  Each printing condition data includes a plurality of printing conditions, and specifically includes an attack angle R, a contact pressure P, and a moving speed V of the head 6 (squeegee 6a). As described above, the attack angle R is the inclination angle of the squeegee 6a (paste pressing surface) with respect to the mask sheet 4 at the time of printing (see FIG. 4; in the case of FIG. 4, the squeegee 6a moves in the + direction of the X axis). The pressure P is the contact pressure of the squeegee 6a with respect to the mask sheet 4 during printing (the value obtained by dividing the pressing force by the contact length, also referred to as printing load), and the moving speed V is the squeegee 6a during printing (head This is the moving speed in the X-axis direction of the support member 5).

Here, the first printing condition data (R ₁ , P ₁ , V ₁ ) and the second printing condition data (R ₂ , P ₂ , V ₂ ) are directional components of the force acting on the paste via the squeegee 6a during printing. Specifically, the size of the direction component parallel to the thickness direction (Z-axis direction) of the substrate W is larger when printing the first type substrate than when printing the second type substrate. , R ₁ <R ₂ , P ₁ > P _2, and the movement speed of the squeegee 6a is slower when printing the first type substrate than when printing the second type substrate (V ₁ <V ₂ ), each printing condition is predetermined.

  Next, the printing operation control of the substrate W by the control device 50 (control unit main body 51) will be described with reference to the flowchart of FIG.

  When the substrate W is loaded into the support unit 16 of the 4-axis unit 10 and the substrate W is loaded on the mask sheet 4, this flowchart starts. First, the main control unit 511 reads the substrate-related data of the substrate to be printed W from the storage unit 513, refers to the through-hole related data in the data, and determines whether or not the substrate W has the through-hole Wa. It is determined whether or not the substrate to be printed W is the first type substrate (steps S1 to S3). In this case, based on the identification ID of the substrate W read by the imaging unit 8, it may be determined whether the substrate is the first type substrate.

If YES is determined, the first printing condition data (R ₁ , P ₁ , V ₁ ) is read from the storage unit 513 to the printing condition setting unit 512 (step S4), and the printing condition setting unit 512 The first printing condition data is set as the printing condition for the substrate W. Thereby, the main control unit 511 starts printing in accordance with the first printing condition data (step S6).

Specifically, to drive the servo motor 40, and sets the squeegee 6a at a predetermined angle of attack R ₁ by controlling the driving based on the output from the encoder built in the motor 40. Thereafter, the servo motor 23 is driven to lower the head 6 to press the squeegee 6a against the mask sheet 4, and the driving of the motor 23 is controlled based on the output from the load sensor 26, the squeegee 6a, pressed through a mask sheet 4 at a predetermined contact pressure P _1. Then, by driving a servo motor (not shown), the head support member 5 is moved in the X-axis direction along the fixed rail 7, and the drive of the motor is controlled based on the output from the encoder incorporated therein. it allows moving squeegee 6a (the head 6) at a predetermined moving speed _{V 1.} Thus, the main control unit 511 applies the paste on the substrate W by driving the head 6 and the like according to the first printing condition data.

On the other hand, if NO is determined in step S3, the second print condition data (R ₂ , P ₂ , V ₂ ) is read from the storage unit 513 to the print condition setting unit 512 (step S5). Thus, the main control unit 511 controls driving of the head 6 and the like according to the second printing condition data (step S6).

  According to the screen printing apparatus as described above, the printing process is performed on both the first type substrate having the through hole Wa as a printing target and the second type substrate not having the through hole Wa as a printing target. However, since the head 6 and the like are controlled according to the individual printing conditions as described above, it is possible to receive good print quality for both the first-type substrate and the second-type substrate. That is, by following the above-mentioned printing conditions, the direction component parallel to the thickness direction of the substrate to be printed out of the direction component of the force acting on the paste during printing is larger than that during printing of the second type substrate. As a result, the filling property of the paste into the through hole Wa is improved. In addition, when the first type substrate is printed, the moving speed of the squeegee 6a is lower than when the second type substrate is printed. In other words, the pressing time of the paste against the mask sheet 4 per unit moving amount of the squeegee 6a is longer, In addition, the influence of the inertia in the moving direction of the squeegee 6a, which is caused by the viscosity of the paste moving in the land portion having no opening, is small, and this also enhances the paste filling property to the through hole Wa.

  Therefore, according to this screen printing apparatus, it is possible to improve the printing quality especially for the first type substrate having the through hole Wa, and as a result, it is better for both the first type substrate and the second type substrate. It becomes possible to enjoy the print quality.

  By the way, the filling property of the paste with respect to the through hole Wa is improved as the value of the direction component parallel to the thickness direction of the substrate to be printed among the direction components of the force acting on the paste through the squeegee 6a during printing increases. The value of the direction component parallel to the thickness direction increases as the attack angle R decreases. Further, the squeegee 6a deforms the opening of the mask sheet 4 by the pressing force during the movement, and the tip slightly enters the opening, thereby serving as a paste guide to the back of the opening. Thereby, the greater the pressing force, that is, the greater the contact pressure P, the greater the paste filling property. Furthermore, the filling property of the paste with respect to the through hole Wa becomes larger as the moving speed V is slower (lower) as described above. On the other hand, the filling property of the paste into the through hole Wa is such that the smaller the diameter φ of the through hole Wa, the larger the substrate thickness dimension T, the higher the paste viscosity N, and the remaining amount Q of the paste on the mask sheet 4. There is a tendency that it gets worse as the number decreases.

Accordingly, the printing conditions (R ₁ , P ₁ , V ₁ ) of the first type substrate are determined in consideration of the parameters (φ, T, N, Q) relating to the paste filling property. It is desirable to do.

Specifically, the printing conditions (R ₁ , P ₁ , V ₁ ) can be determined based on the correlation data as shown in FIGS. 8A to 8D, for example. These data are based on a predetermined standard attack angle R ₀ (the current attack pressure Pl, Pm, Ph (Pl <Pm <Ph)) or a moving speed V1, Vm, Vh (Vl <Vm <Vh). In the example, it is a result of a test examination in relation to each of the above parameters that how much the attack angle is increased / decreased with respect to R ₀ = 45 °) the paste is satisfactorily filled into the through hole Wa. .

  For example, the data shown in FIG. 6A shows the correlation between the through-hole diameter φ (average value) and the attack angle increase / decrease angle θ1, but as shown in the data, a constant contact pressure P (or movement) is shown. In the case of the speed V), if the increase / decrease angle θ1 is determined so that the attack angle R becomes smaller as the through-hole diameter φ becomes smaller, the filling property of the paste can be improved. On the other hand, if the contact hole P is the same (or the moving speed V is larger) if the through-hole diameter φ is the same, if the increase / decrease angle θ1 is set so that the attack angle R becomes smaller, the filling property of the paste is improved. be able to.

Therefore, after specifying the contact pressure P ₁ and the moving speed V ₁ in advance among the printing conditions, the parameters (φ, T, N, Q) are based on the correlation data (FIGS. 8A to 8D). the decrease angle θ1~θ4 attack angle R corresponding to the determined, may be determined attack angle R ₁ from the following equation.

If the printing conditions (R ₁ , P ₁ , V ₁ ) of the first type substrate are determined in this way, it is possible to perform a higher quality printing process on the first type substrate.

In this case, in addition to obtaining the first printing condition data (R ₁ , P ₁ , V ₁ ) in advance and storing it in the storage unit 513, for example, the correlation data is stored in the storage unit 513. In response to the operator's input operation such as the type of the substrate W to be printed, the contact pressure P _1, or the moving speed V _{1, the} print condition setting unit 512 calculates the attack angle R ₁ based on the input data and the correlation data. And the printing conditions (R ₁ , P ₁ , V ₁ ) may be stored in the storage unit 513.

<Second Embodiment>
Next, a second embodiment of the screen printing apparatus according to the present invention will be described.

  The apparatus of the second embodiment is configured to generate first printing condition data on the basis of substrate related data or the like at the time of printing the first type substrate, and to drive and control the head 6 and the like according to the data. In this respect, the configuration is different from the screen printing apparatus of the first embodiment, and the other configurations are basically the same as those of the first embodiment.

  That is, in the apparatus of the second embodiment, the storage unit 513 stores only the second print condition data as the print condition data.

In addition, when the first type substrate is to be printed, the printing condition setting unit 512 reads the substrate related data and the paste related data corresponding to the substrate W from the storage unit 513, and the filling of the paste among the data is performed. The above-mentioned parameters related to the properties, that is, the through-hole diameter φ, the thickness dimension T of the substrate W, and the viscosity N of the paste are referred to, and the first printing condition data (R ₁ , P ₁ , V ₁₎ to create a.

Here, Rs, Ps, Vs, φs, Ts, Ns, φ, T, and N are respectively
Rs: standard attack angle,
Ps: reference contact pressure,
Vs: reference moving speed,
φs: Reference through hole diameter,
Ts: Reference thickness dimension of the substrate,
Ns: Reference viscosity of paste,
φ: Minimum through-hole diameter of the printed circuit board,
T: thickness dimension of the substrate to be printed,
N: the viscosity of the paste to be printed.

  Α1, α2, and α3 are weighting data (α1: α2: α3) indicating the degree of importance of reflection of each of the above parameters (minimum through-hole diameter φ, substrate thickness T, paste viscosity N) in printing conditions, respectively. (0 <= α1, α2, α3 <= 1)), β1, β2, and β3 are weighting data (β1) indicating the degree of reflection importance of each printing condition (attack angle R, contact pressure P, and moving speed V), respectively. : Β2: β3 (0 <= β1, β2, β3 <= 1)). Reference attack angle Rs, reference contact pressure Ps, reference moving speed Vs, reference through hole diameter φs, substrate reference thickness dimension Ts, paste reference viscosity Ns, weighting (α1, α2, α3 and β1, β2, β3) These data are stored in advance in the storage unit 513 as print condition setting data.

That is, as described above, the filling property of the paste into the through hole Wa tends to become worse as the diameter φ becomes smaller, the substrate thickness dimension T becomes larger, and the paste viscosity N becomes higher. Therefore, the attack angle R, contact pressure P, and moving speed V when a good printing (filling) state can be obtained by printing a specific paste on a specific substrate W are set in advance as reference printing conditions (Rs , Ps, Vs), and the through-hole diameter φ, substrate thickness dimension T, and paste viscosity N of the substrate W at that time are standard parameters (φs, Ts, Ns), respectively, The excess and deficiency of the printing conditions necessary for obtaining good paste filling properties is obtained based on the ratio between the values (φ, T, N) of the parameters of the substrate W and the reference values (φs, Ts, Ns). The first printing conditions (R ₁ , P ₁ , V ₁ ) are obtained by correcting the reference printing conditions (Rs, Ps, Vs) based on the excess / deficiency.

  FIG. 9 is a flowchart illustrating printing operation control of the substrate W by the control unit main body 51 (main control unit 511) according to the second embodiment.

In the printing operation control of the second embodiment, the process of step S7 in the control flow (FIG. 7) of the first embodiment is replaced with the process of steps S4 · 1 to 4 · 3 surrounded by a broken line in FIG. Is. That is, in the second embodiment, when the main control unit 511 determines YES in the determination in step S3, the printing condition setting unit 512 reads the substrate related data and paste related data of the substrate W to be printed from the storage unit 513. , Reference printing conditions (Rs, Ps, Vs), reference parameters (φs, Ts, Ns), and weighting data ((α1: α2: α3) (β1, β2, β3)) are read from the storage unit 513, and the above numbers The first printing condition data (R ₁ , P ₁ , V ₁ ) is calculated based on the two equations, and the first printing condition data is updated and stored (steps S 4-1 to 4-3). Thereafter, the main control unit 511 starts printing according to the first printing condition data (step S6).

  According to the screen printing apparatus of the second embodiment as described above, when printing the first type substrate, the through-hole diameter φ, the substrate thickness size T, and the paste viscosity N are taken into account according to the type of the substrate W. Since the first printing condition is obtained and the head 6 and the like are driven and controlled in accordance with the first printing condition data, the filling performance of the paste with respect to the through hole Wa can be improved.

  In particular, regarding the calculation of the first printing conditions, as described above, the weighting data (α1: α2: α3) of the minimum through hole diameter φ, the thickness T of the substrate W, the viscosity N of the paste, the attack angle R, and the contact pressure P And weighting data (β1: β2: β3) of the moving speed V are determined in advance, and the first printing condition is obtained by taking these weighting data into consideration, so that appropriate and effective in consideration of various circumstances on the user side. There is an advantage that a certain first printing condition can be set.

  That is, depending on the specific configuration of the substrate W, when it is desired to set printing conditions with emphasis on specific elements of the parameters (φ, T, N), or in relation to a specific apparatus configuration, For example, since the allowable range (adjustable range) of the contact pressure P is small, even when it is desired to set the printing conditions with an emphasis on other conditions (attack angle R, moving speed V), the above-described apparatus can provide such a situation. There is an advantage that it is possible to respond flexibly to.

  In this embodiment, the through-hole diameter φ, the substrate thickness dimension T, and the paste viscosity N are applied as parameters related to the paste filling property with respect to the through-hole Wa. The first printing condition may be obtained in consideration of the above. In this case, the paste remaining amount Q can be obtained by the method of the third embodiment described later.

<Third embodiment>
Next, a third embodiment of the screen printing apparatus according to the present invention will be described.

  The apparatus of the third embodiment is configured to change the first printing conditions according to the amount of paste consumed during printing of the first type substrate. In this respect, the apparatus and the structure of the first embodiment are configured. Is different. Other configurations are basically the same as those in the first embodiment.

  That is, as shown in FIG. 10, the control unit main body 51 of the third embodiment further includes a paste remaining amount detection unit 514 (corresponding to the paste amount detection means according to the present invention) as its functional configuration. This paste remaining amount detection unit 514 calculates the current paste remaining amount on the mask sheet 4 based on the paste consumption data per printing and the number of production (printing) substrates when printing the first type substrate. Is. Paste consumption data per printing is stored in advance in the storage unit 513 as print condition setting data.

Further, in the third embodiment, the printing condition setting unit 512 performs the following equation 3 each time the paste on the mask sheet 4 decreases by a certain amount or more based on the remaining amount obtained by the paste remaining amount detecting unit 514. The first printing condition data (R ₁ , P ₁ , V ₁ ) is created based on the first printing condition data (R ₁ , P ₁ , V ₁ ), and the storage unit 513 creates the first printing condition data (R ₁ , P ₁ , V ₁ ). The remaining amount of paste when it is applied is updated and stored.

Here, Rc, Pc, Vc, Qc, Qp are respectively
Rc: current attack angle,
Pc: current contact pressure,
Vc: current moving speed,
Qc: Current paste remaining amount Qp: Paste remaining amount at the time of previous printing condition determination.

  Further, γ1, γ2, and γ3 are weighting data (γ1: γ2: γ3 (0 <= γ1, γ2, γ3 <0, respectively) indicating the degree of reflection importance of each printing condition (attack angle R, contact pressure P, moving speed V). = 1)), and this data is stored in advance in the storage unit 513 as print condition setting data.

That is, the filling property of the paste with respect to the through hole Wa tends to deteriorate as the paste on the mask sheet 4 decreases as described above. Therefore, when a paste exceeding a certain amount is consumed, an excess / deficiency value of printing conditions necessary for improving the filling property of the paste with respect to the through hole Wa is obtained according to the reduction ratio of the paste, and based on this excess / deficiency value. By correcting the current printing conditions (Rc, Pc, Vc), new first printing conditions (R ₁ , P ₁ , V ₁ ) are obtained.

  The printing operation control of the third embodiment is performed according to a control flow in which the process of step S4 in the flowchart of the first embodiment shown in FIG. 7 is replaced with the process of FIG. 11 (the process of steps S10 to S16). Is called.

  That is, in the third embodiment, when the main control unit 511 determines YES in the process of step S3 in FIG. 7, the first print condition data (Rc) currently stored in the print condition setting unit 512 from the storage unit 513. , Pc, Vc) is read (step S10 in FIG. 11).

  Next, the printing condition setting unit 512 reads the paste remaining amount data at the time of updating the printing condition from the storage unit 513, the value Qp, and the current remaining paste amount Qc on the mask sheet 4 obtained by the remaining paste amount detecting unit 514. Based on the above, it is determined whether or not it is necessary to change the printing conditions (steps S11 and S12). Specifically, the determination is made based on whether the value of Qp−Qc exceeds a predetermined set value X. Note that, as an initial value of the paste remaining amount Qp at the time of determining the printing conditions, the amount of paste initially put on the mask sheet 4 is stored.

  If NO is determined in step S12, the process proceeds to step S6 in FIG. 7, and the main control unit 511 starts printing according to the first print condition data (Rc, Pc, Vc) read in step S10. .

In contrast, if YES is determined in step S12, the print condition setting unit 512 obtains new first print condition data (Rc, Pc, Vc). That is, the printing condition setting unit 512 reads the weighting data (γ1: γ2: γ3) from the storage unit 513, this data, the current first printing condition data (Rc, Pc, Vc), and the previous printing condition update time. New first printing condition data (R ₁ , P ₁ , V ₁ ) is created based on the above equation 3 on the basis of the paste remaining amount data Qp and the current paste remaining amount data Qc, and this data is stored. The data is stored in the unit 513 in an updated manner, and the current paste remaining amount data Qc is updated and stored as paste remaining amount data when the printing conditions are updated (steps S13 to S16).

Thereafter, the process proceeds to step S6 in FIG. 7, and the main control unit 511 starts printing according to the new first print condition data (R ₁ , P ₁ , V ₁ ) stored in step S15.

  According to the screen printing apparatus of the third embodiment as described above, when printing the first type substrate, the first printing condition is reset according to the paste remaining amount on the mask sheet 4, and the newly set printing is performed. Since the subsequent printing process is performed according to the conditions, the paste filling performance to the through hole Wa can be maintained well even when a large number of sheets are continuously printed on the first type substrate of the same type. . Therefore, there is an advantage that high print quality can be stably maintained for a long time.

  In this embodiment, the paste remaining amount detection unit 514 is configured to calculate the current paste remaining amount based on paste consumption data per print and the number of production (printing) substrates. For example, as schematically shown in FIG. 12, a laser displacement meter 70 is fixedly mounted on the head 6, and the distance to the paste surface pressed by the squeegee 6a is actually measured by the laser displacement meter 70. The remaining paste amount may be obtained based on the above. In this case, for example, correlation data obtained by examining the correlation between the measured value and the paste remaining amount in advance is stored in the paste remaining amount detecting unit 514, and the paste remaining amount is determined based on the actually measured value by the laser displacement meter 70 and the correlation data. What is necessary is just to ask for quantity.

  The printing operation control in such a configuration is as shown in the flowchart of FIG. 13, for example. The control flow in the figure corresponds to the process after the start of printing on the first type substrate (the process after step S6) in the control flow (FIG. 7) of the first embodiment.

That is, when the main control unit 511 starts printing processing of the first type substrate according to the first printing condition data (Rc, Pc, Vc) (step S20), the remaining paste amount detecting unit 514 performs laser displacement during the printing. The paste remaining amount is obtained on the basis of the actually measured value by the total 70 and the correlation data (step S21). When printing is completed (YES in step S22), new first printing condition data (R ₁ , P ₁ , V ₁ ) is received by the printing condition setting unit 512 as necessary according to the processing in steps S23 to S28. Desired. The specific contents of steps S23 to S28 are the same as the process contents of steps S11 to S16 of FIG. 9 described above.

  According to such a configuration, the physical quantity (in this example, the distance from the laser displacement meter 70 to the paste surface) associated with the remaining paste amount on the mask sheet 4 is measured, and the remaining paste amount is determined based on this measured value. Because it requires, the reliability of the required paste remaining amount is high.

  Therefore, there is an advantage that the new first printing condition required based on the paste remaining amount is also more reliable. In the case of this configuration, the laser displacement meter 70 and the paste remaining amount detection unit 514 constitute paste amount detection means according to the present invention.

<Fourth embodiment>
Next, a screen printing apparatus according to a fourth embodiment of the present invention will be described.

  The screen printing apparatus according to the fourth embodiment is configured to perform the printing process while changing the printing conditions for each specific region (area) of one substrate W during the printing process of the first type substrate. The other basic configuration is the same as that of the second embodiment.

  That is, when the substrate W to be printed is the first type substrate, the printing condition setting unit 512 of the fourth embodiment reads the substrate related data corresponding to the substrate W from the storage unit 513, and sets the through hole Wa. A plurality of areas (regions) along the Y-axis direction (moving direction of the squeegee 6a) with respect to the substrate W depending on the presence / absence and presence / absence of a circuit pattern to be printed (printed portion other than the through hole Wa). Set. In this case, the printing condition setting unit 512 sets an area including only the through hole Wa as much as possible.

  FIG. 14 is an example of a set print area. In FIG. 14, a print area A1 that performs only pattern printing, a print area A2 that performs only through-hole printing, and a print that performs both pattern printing and through-hole printing. Area A3 is set. In the figure, reference numerals 401 and 402 are openings for printing the inner pattern of the opening 4a for printing formed in the mask sheet 4, and reference numerals 403 and 404 are openings for through-hole printing. In this embodiment, the print area A1 corresponds to the second area according to the present invention, and the print areas A2 and A3 correspond to the first area according to the present invention.

Further, the printing condition setting unit 512 prints the printing condition data (R ₁₁ , P ₁₁ , V ₁₁ ), (R ₂₁ , P ₂₁ , V ₂₁ ), (R ₃₁ , P ₃₁ ) for each of the printing areas A1 to A3. , V ₃₁ ). In this case, for the printing areas A2 and A3 including the through hole Wa, the printing condition setting unit 512 creates the printing condition data according to the above equation 2 as in the second embodiment. On the other hand, for the printing area A1 that does not include the through hole Wa, the printing condition setting unit 512 applies the second printing condition data for second type substrate printing stored in the storage unit 513.

  The printing operation control of the fourth embodiment is basically the same as the control flow of FIG. 9 of the second embodiment, but when the substrate W to be printed is the first type substrate, FIG. Instead of the processes of steps S4 · 1 to S4 · 3, S6, the printing process proceeds according to the control flow of FIG.

  That is, when it is determined that the printing substrate W is the first type substrate (YES in step S3 in FIG. 9), the printing condition setting unit 512 reads the substrate related data of the printing substrate W from the storage unit 513, Based on this data, the print area is set (step S30 in FIG. 15). Here, a description will be given assuming that three print areas A1 to A3 (number of divisions N = 3) are set as described above (see FIG. 14).

  Next, the printing condition setting unit 512 sets an initial value “1” to the area counter value i (step S31), arranges the squeegee 6a at a predetermined work start position on the mask sheet 4, and places it on the mask sheet 4. Supply paste. Specifically, after setting the squeegee 6a at a predetermined initial attack angle, the head 6 is lowered with respect to the head support member 5 to press the squeegee 6a against the mask sheet 4, and in this state, the squeegee 6a Supply paste just before. As a result, a print standby state is entered.

  When the print standby state is entered, the print condition setting unit 512 obtains print condition data of the first print area A1, that is, the print area through which the head 6 passes first (print area A1 in FIG. 14) during printing (step SS32).

  When the print condition data of the first print area A1 is created, the main control unit 511 performs the operation based on the current position (work start position) of the squeegee 6a and the print start position P1s (see FIG. 14) of the print area A1. It is determined whether or not the attack angle can be changed to the printing condition angle by the print start position P1s (step S33).

If YES is determined, the main control unit 511 controls the head 6 and the like based on the printing condition data (R ₁₁ , P ₁₁ , V ₁₁ ) created in step S32. As a result, the attack angle of the squeegee 6a is changed, and the squeegee 6a is moved at a predetermined moving speed along the mask sheet 4 in a state where the squeegee 6a is in contact with the mask sheet 4 at a predetermined attack angle and contact pressure (step). S34-S37). Thus, printing is performed on the printing area A1 of the substrate W.

On the other hand, if NO is determined in step S33, the main control unit 511 stops the movement of the head 6 (maintains the stopped state when the head 6 is stopped), and in this state, Based on the printing condition data (R ₁₁ , P ₁₁ , V ₁₁ ), the attack angle of the squeegee 6a is changed, and the squeegee 6a is brought into contact with the mask sheet 4 with a predetermined contact pressure (steps S39 to S41).

  When the change of the attack angle is completed (YES in step S41), the main control unit 511 starts moving the head 6 (steps S42 and S37), and thereby applies the paste to the print area A1 of the substrate W.

When the head 6 (squeegee 6a) reaches the print end position P1e of the print area A1, the main control unit 511 determines whether or not the counter value i of the print area is equal to or greater than the set number (division number N) (step S1). S38) If NO is determined here, the main control unit 511 increments the counter value i of the area, and then proceeds to step S32 to print the printing condition data (R ₂₁ , P _{21) of the} next printing area A2. , V ₂₁ ), the process proceeds to step S33.

  In this way, the remaining printing areas A2 and A3 are sequentially printed while changing the printing conditions, and if YES is finally determined in step S38, that is, the head 6 (squeegee 6a) is applied to all the printings A1 to A3. When the main control unit 511 determines that has moved, the main control unit 511 ends the printing process on the substrate W, drives the 4-axis unit 10 to separate the substrate W from the mask sheet 4, and ends the present flowchart.

  In the screen printing apparatus of the fourth embodiment as described above, when printing the first type substrate, the surface of the substrate W is divided into a print area having a through hole Wa and a print area other than the print area. Since it is configured to proceed with the printing process while sequentially changing the printing conditions by individually creating the printing condition data for each, the printing area having the through hole Wa is good for the through hole Wa. On the other hand, the other printing areas can be satisfactorily printed with a pattern without inconvenience such as penetration of the paste between the mask sheet 4 and the substrate W. .

  Therefore, even when a portion that performs through-hole printing and a portion that performs pattern printing coexist, it is possible to print well on all print target portions, and it is possible to enjoy even higher printing quality. There is an advantage of becoming.

  Although not mentioned in detail in the description of the above embodiment, in the screen printing apparatus according to the first embodiment, the first printing condition data and the second printing condition data, or the correlation data are previously stored in the control device. 50 is stored in an external storage device 57 connected to the external storage device 57 via a data bus, or in an external storage device 57 built in a host computer (not shown) connected via a LAN or the like (a host computer for mounting line control), Substrate related data of the substrate W to be printed in the production program fetched into the storage unit 513 for each printing lot, identification ID data of the substrate W read by the imaging unit 8, or type data of the substrate W manually input by the operator Based on the printing condition selected by the printing condition setting unit 512 or based on the above equation (1). Conditions may be a so as incorporated in the storage unit 513. Further, the printing condition setting unit 512 may be provided in the host computer via a LAN or the like.

  Further, in the production program for each printing lot created by a production program creation device (not shown), the printing substrate W type data and printing conditions based on selection or calculation corresponding to this type data are included. By taking this production program into the storage unit 513, the control unit main body 51 may drive-control the head drive means (servo motors 23, 60, etc.) and the squeegee drive means (servo motor 40, etc.).

  Also in the screen printing apparatus according to the second or fourth embodiment described above, the substrate-related data and the paste-related data are stored in the external storage device 57 and are stored in the storage unit 513 for each printing lot. Based on the substrate-related data of the printed substrate W in the program, the identification ID data of the substrate W read by the imaging unit 8, or the type data of the substrate W manually input by the operator, the control unit main body 51 or a host (not shown) The printing condition may be calculated in the printing condition setting unit 512 provided in the computer. In addition, in the production program for each printing lot created by a production program creation device (not shown), the type data of the substrate W to be printed and the printing conditions calculated corresponding to this type data are included. By taking this production program into the storage unit 513, the control unit main body 51 may drive-control the drive means (servo motors 23, 60, etc.) and the squeegee drive means (servo motor 40, etc.).

  Furthermore, in the screen printing apparatus according to the third embodiment described above, the printing condition is calculated in the printing condition setting unit 512 provided in the host computer (not shown) using the remaining paste amount data during printing. The drive means (servo motors 23, 60, etc.) and the squeegee drive means (servo motor 40, etc.) may be driven and controlled via the control unit main body 51.

  The screen printing apparatuses according to the first to fourth embodiments described above are examples of preferable embodiments of the screen printing apparatus according to the present invention (screen printing apparatus to which the printing method of the present invention is applied). The specific configuration and printing method are appropriately changed without departing from the gist of the present invention. Further, although not specifically mentioned in the embodiments, the methods and configurations employed in each embodiment that can be applied to other embodiments can be appropriately applied to other embodiments. . That is, a configuration (method) in which the first to fourth embodiments and their modifications are appropriately combined is also within the scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view showing a first embodiment of a screen printing apparatus according to the present invention (screen printing apparatus in which a printing method according to the present invention is used). It is a front schematic diagram showing a screen printing apparatus. It is a perspective view which shows the specific structure of a printing head. FIG. 4 is a front view showing a specific configuration of a printing head (a view taken in the direction of arrow A in FIG. 3). It is a block diagram which shows the control system of a screen printing apparatus. It is a block diagram which shows the function structure of a control part main body. It is a flowchart which shows an example of printing operation control by a control part main body (main control part). It is a figure which shows the relationship (correlation data) between the various parameters linked | related with the paste filling performance with respect to a through hole, and an attack angle (increase / decrease). It is a flowchart which shows an example of printing operation control by the control part main body (main control part) of the screen printing apparatus (2nd Embodiment) which concerns on this invention. It is a block diagram which shows the function structure of the control part main body of the screen printing apparatus (3rd Embodiment) which concerns on this invention. It is a flowchart which shows an example of printing operation control by a control part main body (main control part). It is a principal part schematic diagram of the head for printing which shows the structure in the case of measuring the residual amount of a paste with a laser displacement meter. It is a flowchart which shows an example of printing operation control by a control part main body (main control part). It is a plane schematic diagram of a mask sheet and a substrate showing an example of setting a print area. It is a flowchart which shows an example of printing operation control by the control part main body (main control part) which concerns on 4th Embodiment.

Explanation of symbols

3A printing stage 3B inspection stage 4 mask sheet 5 head support member 6 printing head 6a squeegee 10 4-axis unit 16 support unit 50 control device 51 control unit main body 511 main control unit 512 printing condition setting unit 513 storage unit

Claims (14)

The squeegee is brought into contact with the mask sheet on which the substrate is overlaid with a predetermined contact angle and pressing force, and the squeegee is moved along the mask sheet, whereby the predetermined paste is moved on the mask sheet by the squeegee. While in the printing method of applying on the substrate through the printing opening of the mask sheet,
With at least one of the contact angle or the pressing force of the squeegee as a printing condition, printing is performed by setting individual printing conditions for the first type substrate having a through hole and the second type substrate having no through hole, Of the directional components of the force acting on the paste via the squeegee, the magnitude of the directional component parallel to the thickness direction of the substrate is greater when printing the first type substrate than when printing the second type substrate. The printing method is characterized in that the printing conditions are set in the printing method. A printing head equipped with a squeegee and provided so as to be relatively movable along a mask sheet on which a substrate is overlaid, and a head driving means for driving the printing head, the squeegee being attached to the mask sheet The screen is applied to the substrate through the printing opening of the mask sheet while the predetermined paste is moved by the squeegee by making contact with the mask sheet with a predetermined contact angle and pressing force and moving the mask along the mask sheet. In the printing device,
The head drive according to printing conditions individually determined for the first type substrate and the second type substrate depending on whether the substrate to be printed is a first type substrate having a through hole or a second type substrate having no through hole. Control means for controlling the means,
The screen printing apparatus according to claim 1, wherein the printing condition is a moving speed of the squeegee, and is set to be slower when printing the first type substrate than when printing the second type substrate. A printing head equipped with a squeegee and provided so as to be relatively movable along a mask sheet on which a substrate is overlaid, and a head driving means for driving the printing head, and further driving the squeegee At least one of the squeegee driving means for changing the contact angle of the squeegee with respect to the mask sheet and the pressing force changing driving means for changing the pressing force of the squeegee against the mask sheet by relatively displacing the mask sheet and the squeegee in the vertical direction. A squeegee is brought into contact with the mask sheet at a predetermined contact angle and pressing force, and moved along the mask sheet, thereby moving a predetermined paste with the squeegee and opening a mask sheet printing opening. In a screen printing apparatus for coating on a substrate via
The drive means according to printing conditions individually determined for the first type substrate and the second type substrate depending on whether the substrate to be printed is a first type substrate having a through hole or a second type substrate having no through hole. Control means for controlling
The printing condition is at least one of the contact angle and the pressing force, and is determined so that the contact angle is smaller when printing the first type substrate than when printing the second type substrate. Alternatively, and / or a screen printing apparatus, wherein the pressing force is determined to be larger when the first type substrate is printed than when the second type substrate is printed. The screen printing apparatus according to claim 3.
The screen further includes a moving speed of the squeegee as the printing condition, and the moving speed is determined to be slower when printing the first type substrate than when printing the second type substrate. Printing device. The screen printing apparatus according to any one of claims 2 to 4,
The screen printing apparatus according to claim 1, wherein the printing condition of the first type substrate is set based on a parameter associated with a filling property of the paste with respect to the through hole. The screen printing apparatus according to claim 5, wherein
The parameter is at least one of a through-hole diameter, a substrate thickness, and a viscosity of the paste. The printing conditions of the first type substrate are the paste as the through-hole diameter decreases and the substrate thickness increases. The screen printing apparatus is set so that the paste filling property to the through hole becomes higher as the viscosity of the screen becomes higher. The screen printing apparatus according to claim 6.
The parameters include a plurality of parameters of through-hole diameter, substrate thickness, and paste viscosity, and the printing conditions of the first type substrate are set according to weighting data set in advance for the plurality of parameters. A screen printing apparatus. The screen printing apparatus according to any one of claims 2 to 7,
At least one of storage means provided in a printing apparatus main body for storing the printing conditions, and interface means provided in the printing apparatus main body for taking in the printing conditions from outside the main body; and the control means includes the storage means A screen printing apparatus that controls the driving unit based on the printing condition stored in the printer or the printing condition fetched through the interface unit. The screen printing apparatus according to any one of claims 2 to 7,
The printing machine main body includes a printing condition setting unit that sets the printing condition of the first type substrate. When the printing target substrate is the first type substrate, the control unit is set by the printing condition setting unit. A screen printing apparatus that controls the driving unit based on the printing conditions. The screen printing apparatus according to any one of claims 2 to 9,
A type detection unit that detects whether the substrate is the first type substrate or the second type substrate from identification information provided on the print target substrate, and the control unit performs printing corresponding to the type detected by the type detection unit. A screen printing apparatus that controls the driving means according to conditions. The screen printing apparatus according to any one of claims 2 to 9,
The control means converts the board type data input via the input means provided in the printing apparatus main body or the board type data input from the outside of the printing apparatus main body via the interface means provided in the printing apparatus main body. A screen printing apparatus comprising: discriminating whether a substrate to be printed is the first type substrate or the second type substrate, and controlling the driving unit according to a printing condition corresponding to the type. The screen printing apparatus according to any one of claims 2 to 11,
A plurality of conditions including at least one of the contact angle of the squeegee, the pressing force, or the moving speed of the squeegee is set as the printing condition of the first type substrate, and when the substrate to be printed is the first type substrate, A screen printing apparatus, wherein the control unit controls the driving unit according to the printing condition set based on weighting data set in advance for a plurality of printing conditions. The screen printing apparatus according to any one of claims 2 to 12,
A paste amount detection unit capable of detecting a current paste amount on the mask sheet during printing of the first type substrate is further provided, and the printing condition is changed based on a detection result by the paste amount detection unit. A screen printing apparatus, wherein the control means controls the driving means. The screen printing apparatus according to any one of claims 2 to 13,
The control means includes a first region in which the substrate to be printed is a first type substrate and includes a through region as a printing region and a second region that does not include a through hole, and these regions are included in the squeegee. When arranged side by side in the moving direction, the second region having no through-hole in the second region based on the first printing condition for the first-type substrate having the through-hole in the first region of the substrate. A screen printing apparatus, wherein the drive means is controlled to perform printing based on a second printing condition for a substrate.

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