JP6832357B2 - Screen printing device and printing condition setting method - Google Patents

Description

The present invention relates to a screen printing apparatus and a printing condition setting method.

Conventionally, a screen printing apparatus has been known in which a screen mask provided with an opening corresponding to a printing pattern is fixed on a substrate, and the opening is filled with solder by a squeegee to perform screen printing (for example, Patent Document). 1). In this screen printing device, the filling state of the solder in the opening is imaged, and when a defective filling portion is detected, the amount of solder supplied, the degree of pressure contact of the squeegee, the moving speed of the squeegee, etc. are adjusted as conditions that can be set for the filling operation. It is supposed to be.

Japanese Unexamined Patent Publication No. 10-337843

However, in the screen printing apparatus described above, it is not described what kind of filling defect is detected and how to specifically adjust the conditions related to the filling operation. For example, when a worker adjusts each condition, it is difficult for the worker to accurately predict how the filling state will change due to the adjustment, and the adjustment method depends on the skill and experience of the worker. It may vary. In addition, depending on the adjustment method of the operator, it is possible that the filling state may worsen.

An object of the present invention is to easily set more appropriate printing conditions in screen printing.

The present invention has taken the following measures to achieve the above-mentioned main object.

The screen printing apparatus of the present invention
A screen printing device that performs screen printing by filling the openings of a screen mask with a viscous fluid and applying it on a substrate.
Before the execution condition of the screen printing is set, the provisional condition setting means for setting the provisional condition which is the provisional execution condition and the provisional condition setting means.
Each time the screen printing is executed based on the tentative condition, either the state of the opening or the state of the viscous fluid coated on the substrate is acquired as an execution result in association with the tentative condition. Execution result acquisition means and
Execution condition setting means for selecting the provisional condition associated with the execution result closer to the reference result based on the execution result and the predetermined reference result, and setting the selected provisional condition as the execution condition. When,
The gist is to prepare.

The screen printing apparatus of the present invention corresponds to either the state of the opening of the screen mask or the state of the viscous fluid applied on the substrate each time the screen printing is executed based on the tentative condition. Attach and get as the execution result. Then, based on the execution result and the predetermined reference result, a tentative condition associated with the execution result closer to the reference result is selected and set as the execution condition for screen printing. As a result, screen printing can be executed while changing the provisional conditions as appropriate, and the provisional conditions associated with the execution results closer to the predetermined reference result can be set as the execution conditions for screen printing. Therefore, since it is possible to easily set an appropriate execution condition in which the actual execution result is closer to the reference result, the print quality can be easily improved.

In the screen printing apparatus of the present invention, an image pickup device capable of photographing the screen mask from below with the screen mask and the substrate separated from each other, and the image pickup device before the screen printing is executed. A reference result acquisition means for acquiring a reference image captured by the screen mask as the reference result is provided, and the execution result acquisition means captures the screen mask by the imaging device after the screen printing is executed. The printed image is acquired as the execution result in association with the provisional condition, and the execution condition setting means obtains the post-print image closer to the reference image based on the post-print image and the reference image. The associated provisional condition may be selected and the selected provisional condition may be set as the execution condition. In this way, the execution conditions for screen printing can be easily set based on the reference image as the reference result and the printed image as the execution result.

In the screen printing apparatus of the present invention, the execution condition and the provisional condition include a filling condition when filling the opening with a viscous fluid, and the execution condition setting means is the opening in the post-printing image. The filling condition as the provisional condition associated with the printed image in which the bleeding amount of the viscous fluid bleeding at the edge is closer to the bleeding amount in the reference image is selected and set as the filling condition as the execution condition. It may be the one to do. In this way, appropriate filling conditions can be easily set.

In the screen printing apparatus of the present invention, the execution condition and the provisional condition include a separation condition for separating the screen mask and the substrate after filling the opening with a viscous fluid, and the execution condition setting means. Selects the separation condition as the provisional condition associated with the post-print image in which the residual amount of the viscous fluid remaining in the opening in the post-print image is closer to the residual amount in the reference image. It may be set to the separation condition as the execution condition. In this way, an appropriate separation condition can be easily set.

In the screen printing apparatus of the present invention, the execution condition and the provisional condition include a separation condition for separating the screen mask and the substrate after filling the opening with a viscous fluid, and the execution condition setting means. Selects the separation condition as the provisional condition associated with the post-print image in which the amount of the viscous fluid dripping from the edge of the opening in the post-print image is closer to the dripping amount in the reference image. Therefore, it may be set as a separation condition as the execution condition. In this way, an appropriate separation condition can be easily set. The image pickup device in this case can be a device capable of capturing a three-dimensional image.

In the screen printing apparatus of the present invention, the reference image is an image in which a part of the screen mask provided with the opening is imaged by the imaging apparatus before the screen printing is executed. The post-print image may be an image in which a part of the region is captured by the image pickup device after the screen printing is executed. In this way, it is possible to set an appropriate execution condition by a simple process as compared with the case where the execution condition is set based on the image obtained by capturing the entire area of the screen mask.

The printing condition setting method of the present invention is
This is a printing condition setting method in screen printing in which the opening of a screen mask is filled with a viscous fluid and applied onto a substrate.
(A) A step of setting a tentative execution condition, which is a tentative execution condition, and a step before the execution condition of the screen printing is set.
(B) Each time the screen printing is executed based on the tentative condition, either the state of the opening or the state of the viscous fluid applied on the substrate is executed in association with the tentative condition. The steps to get as a result and
(C) A step of selecting the provisional condition associated with the execution result closer to the reference result based on the execution result and a predetermined reference result, and setting the selected provisional condition as the execution condition. When,
The gist is to include.

The printing condition setting method of the present invention executes screen printing while appropriately changing the provisional conditions, and screen prints the provisional conditions associated with the execution result closer to the predetermined reference result, similarly to the screen printing apparatus described above. Can be set as the execution condition of. Therefore, since it is possible to easily set an appropriate execution condition in which the actual execution result is closer to the reference result, the print quality can be easily improved.

It is a block diagram which shows the outline of the structure of the printing apparatus 10 of this embodiment. It is a block diagram which shows the electrical connection relationship of the control device 70 of a printing device 10. It is a flowchart which shows an example of the imaging process. It is a flowchart which shows an example of a print condition setting process. It is explanatory drawing which shows an example of a reference image. It is explanatory drawing which shows an example of the image after printing. It is a flowchart which shows the print condition setting process of the modification. It is explanatory drawing which shows an example of the bleeding amount of solder. It is a flowchart which shows the print condition setting process of the modification. It is explanatory drawing which shows an example of the amount of dripping of solder.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of the configuration of the printing device 10 of the present embodiment, and FIG. 2 is a block diagram showing an electrical connection relationship of the control device 70 of the printing device 10.

The printing apparatus 10 of the present embodiment is a screen in which a plurality of openings H (pattern holes) formed in a rectangular screen mask M are filled with a viscous fluid such as solder by moving a squeegee 31 and applied to a substrate S. It prints. Although solder is exemplified as a viscous fluid, the present invention is not limited to this, and an adhesive or a conductive paste may be used. Here, the left-right direction of FIG. 1 is the printing direction for moving the squeegee 31, and the direction from the back to the front (vertical direction to the paper surface) of FIG. 1 is the transport direction of the substrate S. As the screen mask M, different types are prepared depending on the type of the substrate S, and the mask thickness may differ depending on the type of the screen mask M. Further, the opening H may have various shapes and sizes depending on the type of the screen mask M, or may have a region densely formed in a part of the screen mask M.

As shown in FIG. 1, the printing apparatus 10 includes a base 12 and a housing 14 provided on the base 12. On the base 12, a substrate transfer device 21 that conveys the substrate S by driving a pair of left and right belt conveyors 21a and 21b, a side clamp device 22 that clamps the left and right side surfaces of the substrate S, and a substrate S are backed up from the lower surface. A backup device 24 is provided. The housing 14 is provided with a mask holder 16 that clamps and holds the screen mask M by a plurality of clamp cylinders (not shown), a printing unit 30 that performs screen printing, and a mark camera 18 that can image various marks and the like. ing.

The side clamp device 22 includes a pair of left and right side clamps 22a and 22b, and clamps both sides of the substrate S by the pair of side clamps 22a and 22b. The side clamp device 22 clamps the substrate S so that the upper surfaces of the side clamps 22a and 22b are at the same height as the upper surface of the substrate S. Further, in the side clamp device 22, the clamp elevating device 23 (see FIG. 2) raises the upper surface of the clamped substrate S to a printing position where the upper surface of the clamped substrate S abuts on the back surface of the screen mask M, or the substrate S after soldering has been applied. It descends until it is separated from the screen mask M at a predetermined separation position.

The backup device 24 includes a backup table 25 that can be raised and lowered by a lifting device (not shown), and a plurality of backup pins 26 that are installed on the backup table 25. The backup device 24 backs up the substrate S from the lower surface by the backup pin 26 by raising the backup table 25 in a state where the substrate S is transported by the substrate transport device 21.

The printing unit 30 includes a printing head 32 to which the squeegee 31 can be lifted and lowered by the squeegee lifting device 31a (see FIG. 2). The print head 32 moves in the left-right direction of FIG. 1 by driving a head motor (not shown) while pressing the squeegee 31 against the screen mask M to perform screen printing. The print head 32 can also be moved from the back of FIG. 1 to the front.

The mark camera 18 is configured to be capable of capturing images above and below, and can be moved in a horizontal plane between the substrate S and the screen mask M by driving the camera moving device 19 and is in a standby position (in FIG. 1). It moves from the dotted line position) to an arbitrary position in the horizontal plane (for example, the solid line position in FIG. 1). The mark camera 18 captures the substrate mark of the substrate S and the mask mark of the screen mask M in a state where the screen mask M and the substrate S are separated from each other. Further, the mark camera 18 captures an image of a region including the opening H of any one of the screen masks M.

In addition to this, the printing device 10 includes a touch panel type display operation panel 17 and a control device 70 that controls the entire device, as shown in FIG. The display operation panel 17 displays various information and accepts input operations from the operator. The operator selects and inputs the type of screen mask M to be used, and selects and inputs the type of solder to be used, through the display operation panel 17.

As shown in FIG. 2, the control device 70 is configured as a microprocessor centered on the CPU 71, and includes a ROM 72, a RAM 73, an HDD 74, an input / output interface 75, and the like in addition to the CPU 71. These are electrically connected to each other via a bus 76. The operation signal from the display operation panel 17 and various images captured by the mark camera 18 are input to the control device 70. On the other hand, from the control device 70, a display signal to the display operation panel 17, an imaging instruction signal to the mark camera 18, a drive signal to the camera moving device 19, a drive signal to the substrate transfer device 21, and a side clamp device 22. A drive signal, a drive signal to the backup device 24, a drive signal to the printing unit 30, and the like are output.

The printing apparatus 10 of the present embodiment has, as printing conditions in screen printing, a filling condition when filling the opening H (pattern hole) with solder and a case where the substrate S after solder application is separated from the screen mask M. It is possible to set the separation condition (plate separation condition) of. Various conditions that can be set are stored in the HDD 74 of the control device 70, and the CPU 71 sets the type of screen mask M used for screen printing and the substrate S to be screen-printed from the stored various conditions. Screen printing is executed based on the execution conditions set according to the type. As filling conditions, the CPU 71 sets the printing pressure PP, which is the pressure at which the squeegee elevating device 31a presses the squeegee 31 against the screen mask M, and the moving speed MS, which is the speed at which the head motor moves the print head 32 (squeegee 31). It can be set. Further, as the separation condition, the CPU 71 switches between the lowering speed DS, which is the speed at which the clamp elevating device 23 lowers the substrate S, and the lowering speed DS until the substrate S is lowered to a predetermined separation position, and the lowering speed DS. It is possible to set the switching position SP and the like when switching. When the squeegee 31 is configured to have a variable angle, the CPU 71 may set the angle of the squeegee 31 as a filling condition. Further, the CPU 71 may set the standby time at the switching position SP of the descending speed DS as the separation condition, or set whether or not the substrate S is re-elevated and then lowered after the standby. ..

Next, the operation of the printing device 10 of the present embodiment configured in this way, particularly the operation of the printing device 10 for setting the printing conditions for screen printing will be described. FIG. 3 is a flowchart showing an example of an imaging process, FIG. 4 is a flowchart showing an example of a print condition setting process, FIG. 5 is an explanatory diagram showing an example of a reference image, and FIG. 6 is a print. It is explanatory drawing which shows an example of the rear image. In the present embodiment, the operation of the CPU 71 to set an appropriate separation condition will be described, and default conditions will be set for the filling conditions such as the printing pressure PP and the moving speed MS.

In the imaging process of FIG. 3, the CPU 71 of the control device 70 first determines whether or not it is the imaging timing of the reference image before the execution of screen printing (S100). As shown in FIG. 5, the reference image is an image showing a reference state in which no solder remains or almost no solder remains in the opening H or the edge of the opening H as a reference result of screen printing. This is an image of a part of the screen mask M. Further, the imaging timing of the reference image is, for example, the timing from when the screen mask M is replaced with a new one according to the type of the substrate S until the first screen printing is executed, or the screen printing under the provisional conditions described later. Is executed and the screen mask M is cleaned until the next screen printing is executed. When the CPU 71 determines in S100 that it is the timing for capturing the reference image, the CPU 71 controls the camera moving device 19 to move the mark camera 18 to a predetermined position below the screen mask M (S110). The lower predetermined position is, for example, a lower position of a part of the screen mask M where the openings H are densely packed, or a part of the screen mask M where the opening H having a smaller opening diameter is formed. The lower position is applicable. Such a region is a region in which the solder tends to bleed on the edge of the opening H when the solder is filled, or the solder filled in the opening H tends to remain when the substrate S is separated. .. Therefore, by setting the screen printing execution conditions suitable for these areas in the printing condition setting process described later, it is possible to appropriately prevent the residual solder in the opening H and the solder bleeding at the edge of the opening H. It is possible to set the execution condition as the result. The CPU 71 captures a predetermined area (a part of the area) of the screen mask M with the mark camera 18 to acquire a reference image (S120), and stores the reference image in a storage unit such as a RAM 73 (S130). If the CPU 71 determines in S100 that it is not the acquisition timing of the reference image, the processing of S110 to S130 is skipped.

Next, the CPU 71 determines whether or not it is the imaging timing of the printed image after the execution of screen printing (S140). The post-printed image shows the solder remaining in the opening H of the screen mask M or the solder bleeding on the edge of the opening H as a result of performing the screen printing after the screen printing is executed based on the provisional conditions described later. It is an image for acquiring the state. Therefore, the imaging timing of the image after printing is the timing from the execution of screen printing based on the tentative conditions to the cleaning of the screen mask M. When the CPU 71 determines in S140 that it is the timing for capturing the image after printing, the CPU 71 controls the camera moving device 19 to move the mark camera 18 to a predetermined position below the screen mask M (S150). This predetermined position is the same position as when the reference image is captured. Then, the CPU 71 captures a predetermined area of the screen mask M with the mark camera 18 and acquires an image after printing (S160). Therefore, the printed image is an image of the same area as when the reference image was captured. When the CPU 71 acquires the printed image, the CPU 71 stores the printed image in a storage unit such as the RAM 73 in association with the provisional conditions (S170), and ends this process. If the CPU 71 determines in S140 that it is not the timing for capturing the image after printing, the CPU 71 skips the processes of S150 to S170 and ends this process.

In the print condition setting process shown in FIG. 4, the CPU 71 first determines whether or not the execution condition, which is the print condition for executing screen printing, has been set (S200), and determines that the execution condition has not been set. Then, it is determined whether or not it is the setting timing of the provisional condition which is the provisional execution condition (S210). The tentative condition is a condition used for screen printing that is executed while appropriately changing the print condition until the execution condition is set. The setting timing of the tentative condition is the timing before the screen printing is executed except while the screen printing is executed based on the tentative condition. For example, the post-print image of the screen printing executed based on the tentative condition. Corresponds to the timing after the is acquired and the print result is evaluated. When the CPU 71 determines in S200 and S210 that the execution condition has not been set and it is the timing for setting the provisional condition, the CPU 71 sets the separation condition (temporary separation condition) as the provisional condition (S220). As described above, the printing apparatus 10 can set the descending speed DS for lowering the substrate S, the presence / absence of switching of the descending speed DS, the switching position SP of the descending speed DS, and the like as separation conditions. In S220, the CPU 71 sets a temporary separation condition from a predetermined range of conditions suitable for the substrate S to be screen-printed this time and the type of solder among the settable separation conditions. Further, the CPU 71 sets a temporary condition (temporary separation condition) different from the temporary condition for which screen printing has already been executed. When the temporary separation condition is set in this way, the printing device 10 executes screen printing based on the temporary separation condition. Further, when screen printing is executed based on the temporary separation condition, the image after printing is captured in the imaging process of FIG. 3 and stored in association with the temporary separation condition. The operator cleans the screen mask M after the screen printing is executed based on the temporary execution condition (here, the temporary separation condition). If the CPU 71 determines in S200 that the print conditions for execution have been set, or if it determines in S210 that the timing is not the provisional condition setting timing, the processing of S220 is skipped.

Next, the CPU 71 determines whether or not it is the execution result confirmation timing for confirming the execution result of the screen printing under the provisional condition (S230). For example, when the printed image captured in S160 of the imaging process of FIG. 3 is stored in association with the provisional condition in S170, the CPU 71 determines that it is the execution result confirmation timing. When the CPU 71 determines that it is the execution result confirmation timing, it compares the printed image with the reference image, acquires the residual amount of solder in the opening H, and stores it in a storage unit such as the RAM 73 (S240). The CPU 71 also stores the residual amount of solder in association with the provisional conditions. The image after printing shown in FIG. 6 shows how the solder remains in the opening H. Residual solder mainly differs depending on the difference in separation conditions, and the residual amount of solder is large under the provisional condition 1 (for example, descending speed DS1, no speed switching) in FIG. 6 (a), and the provisional condition 2 (for example) in FIG. For example, at the descending speed DS2, without speed switching), the residual amount of solder is small. Assuming that the CPU 71 acquires the ratio of the residual area of the solder to the opening area of the opening H as the residual amount of the solder, in FIG. 6A, the residual amount such as about 40% is acquired, and FIG. 6B shows. Then, a residual amount such as about 5% will be obtained. If the CPU 71 determines in S230 that it is not the execution result confirmation timing, the processing in S240 is skipped.

Subsequently, the CPU 71 determines whether or not it is the setting timing of the execution condition, which is the print condition for execution (S250). Here, the execution condition setting timing can be the timing when the number of provisional conditions (temporary separation conditions) for which the execution result is confirmed reaches a predetermined number (plurality or the like). Alternatively, when the CPU 71 determines that the execution result (here, the residual amount of solder) acquired in S240 is within the permissible range even before the number of provisional conditions for which the execution result has been confirmed reaches a predetermined number. In addition, it may be determined that the execution condition setting timing has come. When the CPU 71 determines in S250 that it is not the execution condition setting timing, the CPU 71 ends the print condition setting process. Therefore, the CPU 71 sets a tentative condition different from the tentative condition in which screen printing is executed each time the tentative condition is set until the execution condition is set, and executes the executed screen printing. You will check the result.

Then, when the CPU 71 determines in S250 that it is the setting timing of the execution condition, the residual amount of the solder acquired in S240 is the minimum, that is, the temporary condition (temporary separation condition) corresponding to the printed image closer to the residual amount of the reference image. ) Is selected (S260), the selected provisional condition (temporary separation condition) is set as the execution condition (execution separation condition) (S270), and this process is terminated. After the execution conditions are set in this way, the printing device 10 will execute screen printing under the execution conditions. Here, the execution condition (execution separation condition) can be said to be an optimum execution condition that directly reflects the provisional separation condition in which the residual amount of solder in the opening H is minimized. As described above, in the present embodiment, the optimum execution conditions can be easily set regardless of the skill and experience of the worker. Therefore, in screen printing, it is possible to prevent solder from remaining in the opening H and improve the print quality.

Here, the correspondence between the components of the present embodiment and the components of the present invention will be clarified. That is, the printing device 10 of the present embodiment corresponds to the screen printing device of the present invention, and the control device 70 that executes the processes of S200 to S220 of the printing condition setting process of FIG. 4 corresponds to the provisional condition setting means. The control device 70 that executes the processes of S140 to S170 of the imaging process corresponds to the execution result acquisition means, and the control device 70 that executes the processes of S230 to S270 of the print condition setting process of FIG. 4 corresponds to the execution condition setting means. To do. Further, the mark camera 18 corresponds to the image pickup device, and the control device 70 that executes the processes S100 to S130 of the image pickup process of FIG. 3 corresponds to the reference result acquisition means. In the present embodiment, an example of the printing condition setting method of the present invention is also clarified by explaining the operation of the printing device 10.

The printing apparatus 10 of the present embodiment described above associates the state of the opening H of the screen mask M with the tentative condition as a post-print image (execution result) each time screen printing is executed based on the tentative condition. The tentative condition that is acquired and associated with the printed image that is closer to the reference image (reference result) is selected, and the selected tentative condition is set as the execution condition for screen printing. As a result, screen printing can be executed while changing the provisional conditions as appropriate, and a provisional condition closer to the reference image can be set as the execution condition for screen printing. Therefore, an appropriate execution condition whose actual execution result is closer to the reference can be set. It can be easily set and the print quality can be easily improved.

Further, the printing device 10 can easily acquire the reference image as the reference result and the printed image as the execution result by the mark camera 18, and can easily set the execution conditions for screen printing. Further, the mark camera 18 that captures a mark such as the screen mask M can also be used for capturing a reference image or a printed image. Therefore, the execution conditions can be set without providing a dedicated camera for capturing a reference image or a printed image.

Further, the printing apparatus 10 selects a separation condition as a provisional condition associated with the post-printing image in which the residual amount of solder remaining in the opening H in the post-printing image is closer to the residual amount in the reference image. Since the execution separation condition is set as the execution condition, an appropriate separation condition can be easily set.

Further, the printing device 10 uses an image in which a part of the area provided with the opening H is captured as a reference image before the screen printing is executed, and the part of the area is captured after the screen printing is executed as a post-printing image. Since the image is used, the execution conditions can be set by a simple process as compared with the image using the image obtained by capturing the entire area of the screen mask M.

It goes without saying that the present invention is not limited to the above-described embodiment, and can be implemented in various aspects as long as it belongs to the technical scope of the present invention.

For example, in the above-described embodiment, the execution separation condition is set as the execution condition of screen printing, but the present invention is not limited to this, and the execution filling condition as the execution condition may be set. FIG. 7 is a flowchart showing a print condition setting process of the modified example. In the modified example, the same step number is assigned to the same process as the print condition setting process of FIG. In the print condition setting process of the modified example, when the CPU 71 determines in S210 that it is the setting timing of the temporary condition, the CPU 71 sets the filling condition (temporary filling condition) as the temporary condition (S220a). As described above, the printing apparatus 10 can set the printing pressure PP of the squeegee 31 and the moving speed MS of the squeegee 31 as filling conditions. In S220a, the CPU 71 sets temporary filling conditions from a predetermined range of conditions as conditions suitable for the substrate S to be screen-printed this time and the type of solder.

Further, when the CPU 71 determines in S230 that it is the confirmation timing of the execution result, it compares the printed image with the reference image and acquires and stores the amount of solder bleeding on the edge of the opening H (S240a). Here, FIG. 8 is an explanatory diagram showing an example of the amount of bleeding of the solder. FIG. 8A is a reference image captured in the same manner as in FIG. Further, FIGS. 8 (b) and 8 (c) are images after printing, and solder bleeding occurs at the edge of the opening H. Such solder bleeding differs mainly depending on the difference in filling conditions, and the amount of solder bleeding is large under the provisional condition 1 (for example, printing pressure PP1 and moving speed MS1) of FIG. 8 (b), and the amount of solder bleeding is large in FIG. 8 (c). Under the provisional condition 2 (for example, printing pressure PP2, moving speed MS2), the amount of solder bleeding is small. Assuming that the CPU 71 acquires the ratio of the solder bleeding area to the opening area of the opening H as the solder bleeding amount, in FIG. 8B, the bleeding amount such as about 40% is acquired, and FIG. ), The amount of bleeding such as about 5% will be obtained. Then, when the CPU 71 determines in S250 that the execution condition is set, the CPU 71 selects a temporary filling condition corresponding to the printed image in which the amount of bleeding acquired from the printed image is the minimum, that is, the amount of bleeding in the reference image is closer. Then (S260a), the selected temporary filling condition is set as the execution filling condition (S270a), and the print condition setting process is completed.

As described above, the printing device 10 of the modified example is filled as a provisional condition in which the amount of solder bleeding on the edge of the opening H in the post-printing image is associated with the post-printing image closer to the amount of bleeding in the reference image. Since the conditions are selected and set as the execution filling conditions as the execution conditions, the appropriate filling conditions can be easily set.

It should be noted that the separation condition and the filling condition as the execution conditions may be set based on the result of executing the screen printing by setting the separation condition and the filling condition as the provisional conditions. In such a case, the CPU 71 sets temporary separation conditions and temporary filling conditions in S220 of the printing condition setting process, acquires the residual amount of solder and the amount of bleeding of solder in S240, and obtains the amount of solder bleeding in S260. Select a temporary separation condition with the minimum residual amount and a temporary filling condition with the minimum amount of solder bleeding. Then, the CPU 71 may set the selected temporary conditions (temporary separation condition, temporary filling condition) as execution conditions in S270, respectively.

In the above-described embodiment, the camera for acquiring the reference image and the printed image is also used as the mark camera 18, but the present invention is not limited to this, and a dedicated camera for acquiring the reference image and the printed image is provided. May be good. In this case, the camera is not limited to the one that captures the two-dimensional image, and a camera that captures the three-dimensional image may be provided, and the separation condition may be set as follows. FIG. 9 is a flowchart showing a print condition setting process of the modified example. In the print condition setting process of this modification, when the CPU 71 determines in S230 that it is the confirmation timing of the execution result, it compares the printed image with the reference image and acquires the amount of solder dripping from the edge of the opening H. And memorize (S240b). Here, FIG. 10 is an explanatory diagram showing an example of the amount of solder dripping. FIG. 10 (a) is a reference image, and FIGS. 10 (b) and 10 (c) are images after printing, in which solder drips from the edge of the opening H in an icicle shape. Such solder dripping mainly differs depending on the difference in the separation conditions, and the amount of solder dripping is large under the provisional condition 1 (for example, descending speed DS3, no speed switching) in FIG. 10 (b), and the amount of solder dripping is large in FIG. 10 (c). Under the tentative condition 2 (for example, descending speed DS4, no speed switching), the amount of solder dripping is small. Assuming that the CPU 71 acquires the height of the solder from the edge of the opening H as the amount of solder dripping, for example, in FIG. 10B, the amount of dripping such as several tens of μm is acquired, and in FIG. 10C, The amount of sagging such as several μ will be acquired. Then, when the CPU 71 determines in S250 that the execution condition is set, the CPU 71 selects a temporary separation condition corresponding to the post-print image in which the amount of sagging acquired from the post-print image is the minimum, that is, the sagging amount of the reference image is closer. Then (S260b), the selected temporary separation condition is set as the execution separation condition (S270), and the print condition setting process is completed.

As described above, the printing device 10 of the modified example selects the separation condition as a provisional condition associated with the post-printing image in which the amount of sagging from the edge of the opening H in the post-printing image is closer to the sagging amount in the reference image. Then, since the execution separation condition is set as the execution condition, an appropriate separation condition can be easily set. A camera that captures a two-dimensional image from the side of the screen mask M may be used to acquire the amount of solder dripping as a two-dimensional image.

In the above-described embodiment, the image captured by the camera is used as the execution result or the reference result of screen printing, but the present invention is not limited to this. For example, before and after the execution of screen printing, the result of confirming the presence or absence of solder in the opening H and the presence or absence of solder dripping from the opening H by using a reflective sensor or the like may be used.

In the above-described embodiment, the state of the opening of the screen mask M is acquired as the execution result or the reference result of screen printing, but the present invention is not limited to this, and the state of the solder applied to the substrate S is acquired. May be good. In this case, for example, the reference result of the solder normally applied to the substrate S in advance is acquired as a reference image such as a two-dimensional image from above, a two-dimensional image from the side, or a three-dimensional image. When screen printing is executed based on the tentative conditions, the state of the solder applied to the substrate S is acquired as the execution result as a post-print image captured by the same imaging method as the reference image. Even in this way, the execution conditions for screen printing can be set as in the embodiment.

Further, the image after printing may be captured at a predetermined frequency while the screen printing execution conditions are set and the screen printing is executed. Then, the printed image is compared with the reference image, and when, for example, the amount of solder bleeding on the edge of the opening H exceeds a predetermined amount, it is determined that the cleaning timing of the screen mask M has come. May be good. That is, the printing device 10 may not only set the execution conditions but also automatically recognize the determination of the cleaning timing by using the printed image and the reference image.

The present invention can be used in the manufacturing industry of a printing apparatus that performs screen printing.

10 printing equipment, 12 bases, 14 housings, 16 mask holders, 17 display operation panels, 18 mark cameras, 19 camera moving devices, 21 board transfer devices, 21a, 21b belt conveyors, 22 side clamp devices, 22a, 22b side Clamp, 23 Clamp lifting device, 24 Backup device, 25 Backup table, 26 Backup pin, 30 Printing unit, 31 Squeegee, 31a Squeegee lifting device, 32 Print head, 70 Control device, 71 CPU, 72 ROM, 73 RAM, 74 HDD , 75 input / output interface, 76 bus, H opening, M screen mask, S board.

Claims (4)

A screen printing device that performs screen printing by filling the openings of a screen mask with a viscous fluid and applying it on a substrate.
Before the execution condition of the screen printing is set, the provisional condition setting means for setting the provisional condition which is the provisional execution condition and the provisional condition setting means.
Each time the screen printing is executed based on the tentative condition, either the state of the opening or the state of the viscous fluid coated on the substrate is acquired as an execution result in association with the tentative condition. Execution result acquisition means and
Execution condition setting means for selecting the provisional condition associated with the execution result closer to the reference result based on the execution result and the predetermined reference result, and setting the selected provisional condition as the execution condition. When,
An image pickup apparatus capable of imaging the screen mask from below with the screen mask and the substrate separated from each other.
A reference result acquisition means for acquiring a reference image captured by the screen mask by the imaging device as the reference result before the screen printing is executed.
Equipped with a,
The execution condition and the tentative condition include a separation condition for separating the screen mask and the substrate after filling the opening with a viscous fluid.
After the screen printing is executed, the execution result acquisition means acquires a post-printing image in which the screen mask is captured by the image pickup apparatus in association with the provisional conditions as the execution result.
The execution condition setting means selects the tentative condition associated with the post-print image closer to the reference image based on the post-print image and the reference image, and executes the selected tentative condition. The condition is set as the provisional condition associated with the post-print image in which the amount of viscous fluid dripping from the edge of the opening in the post-print image is closer to the dripping amount in the reference image. Select the separation condition of and set the separation condition as the execution condition.
It cleans the printing device. The screen printing apparatus according to claim 1.
The execution conditions and the provisional conditions include filling conditions for filling the opening with a viscous fluid.
The execution condition setting means serves as the provisional condition associated with the post-print image in which the amount of bleeding of the viscous fluid bleeding at the edge of the opening in the post-print image is closer to the bleed amount in the reference image. A screen printing device that selects a filling condition and sets the filling condition as the execution condition. The screen printing apparatus according to claim 1 or 2.
The reference image is an image in which a part of the screen mask provided with the opening is captured by the imaging device before the screen printing is executed.
The post-printing image is a screen printing device that is an image in which a part of the region is captured by the imaging device after the screen printing is executed. This is a printing condition setting method in screen printing in which the opening of a screen mask is filled with a viscous fluid and applied onto a substrate.
(A) A step of setting a tentative execution condition, which is a tentative execution condition, and a step before the execution condition of the screen printing is set.
(B) Each time the screen printing is executed based on the tentative condition, either the state of the opening or the state of the viscous fluid applied on the substrate is executed in association with the tentative condition. The steps to get as a result and
(C) A step of selecting the provisional condition associated with the execution result closer to the reference result based on the execution result and a predetermined reference result, and setting the selected provisional condition as the execution condition. When,
(D) Before the screen printing is executed, the reference image in which the screen mask is imaged by an imaging device capable of imaging the screen mask from below with the screen mask and the substrate separated from each other is obtained. Steps to get as a reference result and
Only including,
The execution condition and the tentative condition include a separation condition for separating the screen mask and the substrate after filling the opening with a viscous fluid.
In the step (b), after the screen printing is executed, the printed image in which the screen mask is captured by the imaging device is acquired as the execution result in association with the provisional conditions.
In the step (c), the tentative condition associated with the post-print image closer to the reference image is selected based on the post-print image and the reference image, and the selected tentative condition is executed. The condition is set as the provisional condition associated with the post-print image in which the amount of viscous fluid dripping from the edge of the opening in the post-print image is closer to the dripping amount in the reference image. Select the separation condition of and set the separation condition as the execution condition.
Printing condition setting method.