JPH07186361A - Screen printing method, mask used for the printing method, and device for placing and locking object to be printed - Google Patents

Abstract

PURPOSE:To clearly print a solid pattern containing a group of linear graphics of parallel lines at small intervals without bleeding on an objected to be printed. CONSTITUTION:A mask 1 in use is provided with printing screen holes 2 for a group of linear graphics of parallel lines at small intervals and printing screen holes 3 for a solid pattern spaced a fixed distance from the screen holes 2. Firstly, a group of linear graphics is printed using ink, a cream solder, or the like of a loading amount smaller than that of a solid pattern. Next, the solid pattern is printed so that the cream solder, ink, or the like of the group of linear graphics applied to an objected to be printed is prevented from adhering to the rear surface of the mask.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing method suitable for printing a group of parallel line patterns having a narrow mutual spacing and an entire pattern having the line patterns at predetermined positions on a single substrate. The present invention relates to a mask used in the screen printing method and a printing material placing and fixing device suitable for carrying out the screen printing method.

[0002]

2. Description of the Related Art In screen printing, cream solder, ink, etc. are placed on a mask on which a predetermined pattern is formed by a large number of screen holes, and a squeegee is brought into sliding contact to push out the cream solder, ink, etc. This is a printing method in which the material is transferred to a printing material fixed below.

In such a conventional method, for example, FIG.
As shown in FIG. 1, a whole pattern C composed of a large number of figures B, B, B ...
When printing a group of line graphics D that are parallel to each other and have a small mutual spacing, a screen hole in which a group of line graphics is mixed in the entire pattern is drilled, as in the case shown in FIG. It will be printed using a mask.

However, in the case of such a mask, since the squeegee slides uniformly over the entire surface of the whole pattern, the amount of cream solder, ink, etc. applied to the group of line figures D is too large. It will be. Also, because of this, cream solder, ink, etc. spread laterally on the back side of the mask, and since these line figures have an extremely small mutual interval, adjacent lines may be connected to each other.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a group of line figures and an entire pattern are separately printed before and after, and a group of line figures are also cream soldered. , Screen printing that makes it possible to print the entire pattern including a group of line figures clearly without blurring to one print substrate by making the application amount of ink etc. smaller than that of the whole pattern It is intended to provide the law.

Further, the present invention also provides a mask used in the screen printing method according to the present invention and an object-to-be-printed material mounting and fixing device suitable for carrying out the screen printing method according to the present invention.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a group of line graphics that are parallel and have a small mutual spacing, and an overall pattern that includes the line graphics at a predetermined location. In the screen printing method for printing on, a mask in which these groups of line figure printing screen holes and the whole pattern printing screen holes are provided separately is used. The screen printing method is characterized by printing with a small application amount of, and then printing the entire pattern so that a group of line-shaped cream solder, ink, etc. applied to the printing object does not adhere to the back surface of the mask. It is in.

Further, in carrying out the above-mentioned printing method, a group of printing screen holes for line figures which are parallel and have a narrow mutual spacing and a printing screen hole for the whole pattern are provided with a required spacing. Further, while the portion of the printing screen hole of the group of line figures is made thin by shaving the surface side on which cream solder, ink, etc. are placed, a group of line figures between the printing screen holes of the whole pattern is formed. From the viewpoint of work efficiency, it is preferable to use a screen printing mask characterized by shaving the printed surface side of the printing portion deeper than the thickness of the printing screen hole portion of the group of line figures.

Furthermore, in carrying out the above-mentioned printing method, a base, and a conveyor belt arranged on the upper part of the base,
A first mounting table and a second mounting table, which are arranged below the transport belt at a predetermined distance and are respectively lifted and lowered by a lifting cylinder at a predetermined timing, and the first front surface of the base, The pair of sandwiching members are disposed in front of and behind each of the second substrate in the conveying direction of the printed material, and are lifted and lowered by a lifting cylinder at a predetermined timing to sandwich the printed material conveyed by the conveyor belt from the front-rear direction. It is also preferable from the standpoint of work efficiency to use a screen printing substrate placement and fixing device.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a mask (metal mask) suitable for use in the present invention.
Is provided with a group of line graphic printing screen holes 2 which are parallel to each other and have a small mutual spacing on the left side of the center, and an overall pattern printing screen hole 3 is provided on the right side of the center.

The part of the group of line figure printing screen holes 2 is thinned by scraping off the surface on which cream solder, ink, etc. are placed, while the whole pattern printing screen hole 3 is formed. The print surface side of the portion for printing the group of line figures in between is cut deeper than the thickness of the portion of the printing screen hole 2 for the group of line figures. In addition, 4 and 5 show the removed parts, respectively.

Thus, in the screen printing method according to the present invention, the mask 1 is used to first print a group of line figures on the object to be printed by the group of screen screens 2 for printing line figures, and then the entire pattern is printed. The entire pattern is printed by the screen hole 3 for use.

When a squeegee (not shown) slides on the mask 1, the printing screen hole 2 for a group of line figures is thinned by scraping off the surface on which cream solder, ink, etc. are placed. Therefore, the amount of cream solder, ink, etc. extruded from the screen hole is small, and therefore these do not spread on the back side of the mask 1.

Further, when the whole pattern is printed next time, the surface of the object to be printed of the group of line graphics, which is located between the screen holes 3 for printing the whole pattern, has a group of line screen printing screen holes 2 for printing. Since it is scraped deeper than the thickness of the portion, the cream solder, ink, etc. already applied do not contact the mask 1.

Further, in the case of printing using the mask 1, if the two printing materials are set under the mask 1 and printed at the same time, and the printing materials are sequentially moved to the right side after printing, the work progresses. . One suitable for carrying out this is the printing material placing and fixing device shown in FIGS. 3 to 5.

In the figure, 6 is a base. Further, the base 6 is provided with a horizontal long hole 6a in the front surface.
Reference numerals 7 and 7 denote conveyor belts arranged on the upper portion of the base 6, and reference numerals 8 and 8 denote pulleys thereof. Reference numeral 9 is a first mounting table disposed below the conveyor belt 7. 10 is the first
A cylinder that raises and lowers the mounting table 9 at a predetermined timing, and is vertically fixed to the base 6. Further, in the cylinder 10, the upper end portion of the piston rod 10a is connected to the lower surface of the first mounting table 9.

Reference numerals 11 and 11 denote guide posts vertically provided on the lower surface of the first mounting table 9, which are slidably fitted into guide sleeves 12 and 12 provided on the base 6. Reference numeral 13a is a tray fixed to the lower surface of the first mounting table 9, and 13b is a tray fixed to the upper surface of the second mounting table described later.

Reference numeral 14 is below the conveyor belt 7.
The second mounting table is arranged at a predetermined distance from the first mounting table 9. Reference numeral 15 is a cylinder for raising and lowering the second mounting table 14. Reference numeral 15a is a piston rod of the cylinder 15. 16 and 16 are guide posts, and 17 and 17 are guide sleeves.

Reference numerals 18 and 19 denote a pair of holding members arranged in front of and behind the first mounting table 9 in the conveying direction of the printed material. 20
Is a cylinder for raising and lowering the one holding member 18 at a predetermined timing, and 21 is a connecting rod. Reference numeral 22 is a cylinder for moving the other holding member 19 up and down at a predetermined timing, and 23 is a connecting rod. Reference numeral 24 is a cylinder that is horizontally fixed to the connecting rod 23 and that moves the holding member 19 forward and backward in a horizontal direction at a predetermined timing.

Reference numerals 25 and 26 are fixing pins 25a and 26a.
And a pair of fixing members disposed between the pair of sandwiching members 18 and 19 and used when a hole is formed in an object to be printed such as a printed circuit board. The pair of fixing members 25 and 26 are connected to the cylinders 29 and 30 via connecting rods 27 and 28, respectively. The cylinder 2
Reference numerals 9 and 30 are for raising and lowering the pair of fixing members 25 and 26 at a predetermined timing.

Reference numeral 31 is a support member for the cylinders 20 and 29, and a projection 31a which is movably fitted in the long hole 6a of the base 6 is provided at the rear portion. 32 is the cylinder 2
2, 30 support members, and the long hole 6 of the base 6 at the rear
A protrusion 32a that is movably fitted to a is provided. These support members 31 and 32 can be moved in the horizontal direction according to the pitch of the pattern.

Numerals 33 and 34 are a pair of sandwiching members arranged in front of and behind the second mounting table 14 in the conveying direction of the printed material. Three
Reference numeral 5 is a cylinder for moving up and down the one holding member 33 at a predetermined timing, and 36 is a connecting rod. 37 is a cylinder for moving up and down the other holding member 34 at a predetermined timing, and 38 is a connecting rod. Also, 39
Is a cylinder that is horizontally fixed to the connecting rod 38 and that moves the holding member 34 forward and backward in a horizontal direction at a predetermined timing.

Reference numerals 40 and 41 are a pair of fixing members having fixing pins 40a and 41a and arranged between the pair of holding members 33 and 34. Further, the pair of fixing members 40, 4
1 is a cylinder 44, 45 through a connecting rod 42, 43 respectively
Connected to.

Reference numeral 46 is a support member for the cylinders 35 and 44, and a projection 46a which is movably fitted in the long hole 6a of the base 6 is provided at the rear portion. 47 is the cylinder 3
7, 45 supporting members, and the long hole 6 of the base 6 at the rear portion.
A protrusion 47a that is movably fitted to a is provided.

The operation of the printing material placing and fixing device is as follows. The clamping members 18, 33 on the front side in the transport direction are raised by a signal from the supply side of the printed material, and the printed material (printed circuit board) transported by the transport belt 7 is stopped. At this time, the operation of the conveyor belt 7 is also stopped. Next, the other holding members 19 and 34 are raised,
After the cylinders have been completely raised, they are moved forward by the cylinders 24 and 39, respectively. As a result, the material to be printed is sandwiched between the pair of sandwiching members 18, 19, 33, 34.

Next, the first mounting table 9 and the second mounting table 14 are raised to support the printing material from below. And in this state, the mask and squeegee descend, cream solder,
A squeegee slides on a mask on which ink or the like is placed for printing.

At this time, using the mask 1, the printing screen holes 3 for the entire pattern are placed on the first mounting table 9, and the printing screen holes 2 for a group of line patterns are placed on the second mounting table 14. If they are positioned and printed, it is possible to print on two printing materials at the same time. Then, after printing, if the print substrate is sequentially transferred to the mounting table on the front side in the transport direction,
The pattern shown in FIG. 6 can be automatically printed.

The operation after printing will be described below.
First, each member is separated from the printing material by the procedure reverse to the above. Next, the conveyor belt 7 starts to operate again and moves the material to be printed forward. Then, the sandwiching members 18, 33 on the front side in the transport direction again rise at a predetermined timing, and thereafter, the printing material is fixed by the same procedure as described above.

[0029]

According to the printing method of the present invention, it is possible to clearly print an entire pattern including a group of line figures that are parallel to each other and have a small mutual interval without bleeding on a printing object. Further, by using the mask and the printing material placing and fixing device according to the present invention, it is possible to automatically and continuously perform printing, which is extremely effective in mass production.

[Brief description of drawings]

FIG. 1 is a surface view of a mask used in a screen printing method according to the present invention.

FIG. 2 is a back view of a mask used in the screen printing method according to the present invention.

FIG. 3 is a front view of the printing material placing and fixing device used in the screen printing method according to the present invention.

FIG. 4 is a side view of the printing material placing and fixing device used in the screen printing method according to the present invention.

FIG. 5 is a plan view of a printing material placing and fixing device used in the screen printing method according to the present invention.

FIG. 6 is a surface view of a printing medium in which a whole pattern including a group of line figures is printed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mask 2 Screen hole for printing a group of line figures 3 Screen hole for printing an entire pattern 4, 5 Scraped part 6 Base 6a Long hole 7, 7 Conveyor belt 9 1st mounting table 10 Cylinder 14 2nd mounting table 15 Cylinder 18, 19 A pair of clamping members 20 Cylinder 22 Cylinder 24 Cylinder 25, 26 A pair of fixing members 29 Cylinder 30 Cylinder 31, 32 Cylinder supporting member 33, 34 A pair of clamping members 35 Cylinder 37 Cylinder 39 Cylinder 40, 41 A pair of fixing Member 44 Cylinder 45 Cylinder 46, 47 Cylinder support member

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // H05K 3/12 C 7511-4E D 7511-4E A 7511-4E

Claims (4)

[Claims] 1. A screen printing method for printing a group of parallel line patterns having a narrow mutual interval and an entire pattern including the group of line patterns at predetermined locations on a printing medium, and a screen for printing the group of line patterns. Using a mask provided with the holes and the screen for printing the whole pattern separated, first, a group of line figures were printed with a smaller amount of cream solder, ink, etc. applied than the whole pattern, and then applied to the substrate. A screen printing method that prints the entire pattern so that a group of line-shaped cream solder, ink, etc. does not adhere to the back surface of the mask. 2. A group of line figure printing screen holes that are parallel and have a small mutual spacing, and a whole pattern printing screen hole are provided at required intervals, and the group of line figure printing screens are further provided. The hole portion is made thin by shaving the surface side on which cream solder, ink, etc. are placed, while the print surface side of the group to print a group of line figures between the printing screen holes of the overall pattern A screen printing mask characterized by being cut deeper than the thickness of a group of line drawing printing screen holes. 3. A base, a conveyor belt disposed on the upper part of the base, and a conveyor disposed below the conveyor belt at a predetermined distance, and each of which is lifted and lowered by a lifting cylinder at a predetermined timing. The first mounting table, the second mounting table, and the front surface of the base table are arranged in front of and behind each of the first and second mounting tables in the conveying direction of the printed material. A screen-printing object placing and fixing device comprising a pair of nipping members for nipping the to-be-printed object conveyed by a conveyor belt from the front-rear direction. 4. A pair of fixing members, which are moved up and down at a predetermined timing by an elevating cylinder and insert a fixing pin into a perforated portion of a printing object, are arranged on a front surface of a base between a pair of holding members. The printing material placing and fixing device for screen printing according to claim 3.