JP3468823B2 - Screen in screen printing - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates are those which relate <br/> the pattern openings on the screen to be used at the so-called screen printing.

[0002]

Conventionally, screen used in a so-called screen printing (hereinafter, screen abbreviated) pattern on the printed circuit board as an object to be printed surface before Symbol screen printing (hereinafter, P- plate abbreviated) of the main A conductor line pattern on the surface (hereinafter abbreviated as a surface) that substantially corresponds to the shape and contour is used.

A conventional example will be described below with reference to the drawings. Figure 5 is an example of a pattern on the screen, 20 of figure A denotes a linear pattern, such as a single strip corresponding to the conductor line path P- plate therewith on the P- plate Both the shape and contour are faithfully traced.
Dotted lines 21, wherein the printing material permeable surface of the conductor line 20 (hereinafter, the opening abbreviation) means a printing material placed on (e.g., solder paste). That is, when the skis are moved in the P direction and printing is performed, the printing material 21 is placed on the line surface of the P- plate through the opening of the conductor line 20. This is indicated by the solid diagonal line 22.

At this time, as can be seen from FIG. 1B, a so-called "chip" (hereinafter, abbreviated as "chip") in which the printing material is not placed may occur at the end of printing. This tendency is not limited to the case of the above strip-shaped pattern, even if it is curved or has a corner where a straight line is bent, it occurs at the end of the pattern near the end in the printing direction, In particular, it is remarkable in gap type screen printing in which a squeeze is moved by providing a slight gap between the screen and the P-plate surface. Therefore, conventionally, when printing the same pattern, for example, 180 ° with the direction (P) in FIG.
We have tried to prevent the above defects by performing repeated printing in the opposite direction.

Further, when a plurality of lines are close to each other so as to be in contact with each other, the printing material placed through the opening faithful to the line shape as described above is so-called "load collapse" on the line. (Printing material spreads in the width direction of the track)
Each line is short-circuited. This will be described with reference to FIG.

As in the case of FIG. 5, reference numeral 23 in FIG. A indicates a pattern on the screen, and dotted line portion 24 indicates a printing material placed on the opening of the pattern. (1, 2) correspond to lines that are close to each other.

FIG. 2B shows a P-board surface printed through the screen of FIG. That is, each symbol has the same meaning as before, and the intersection area 26 of the actual diagonal lines is caused by the collapse of the load of the printing material represented by the actual diagonal line portion 25. If a screen having an opening narrower than the line width on the P-plate is used in order to prevent the short circuit due to the load collapse, the short circuit is prevented, but instead, a significant "chip" is generated. This will be described with reference to FIG.

Reference numeral 27 in FIG.
Means an opening having an opening narrower than the line width and a printing material placed thereon. Reference numeral 29 in FIG. 9B indicates a printing material applied on the P-plate surface through the opening 28, and other symbols and other meanings are the same as the above. That is, although the collapse of the load is prevented, a larger chipping is produced at the end of the pattern than that of the conventional example shown in FIG.

[0009]

As is known from the above description, it is possible to perform screen printing using a screen having an opening having a conventional shape, which has been remarkably advanced in pattern definition and density in recent years. For example, chipping of the line end near the end of printing on the P-plate and load collapse between adjacent lines may occur, resulting in an increase in the number of printing processes and a reduction in the yield of the final P-plate plate making. Will be difficult.

[0010] The present invention removes the drawbacks possessed by the above prior art, in order to solve the problem of improving the man-hour reduction and yield in the screen printing, there is provided a SCREEN having an opening of a new shape.

[0011]

In order to solve the above problems SUMMARY OF THE INVENTION The screen in the screen printing according to the present invention, among the conductor line patterns positioned on the printed circuit board main surface of the printing surface of the screen printing,
The basic feature is that the longitudinal end of the pattern opening corresponding to the linear or curved conductor line on the screen is set to have a larger opening area than the central portion in the longitudinal direction. is there.

That is, the conductor line may be formed in a similar shape even if it has a linear shape, a curved shape, or even a straight bent corner portion.
Regarding the adjacent conductor lines that are adjacent to each other, a screen having the shape of the opening is used in which the concave portions and the convex portions in the width direction are alternately opposed to each other between the lines.

[0013]

The screen according to the present invention has the above-mentioned structure to prevent the pattern end portion from being chipped at the printing end portion, and it is not necessary to take the step of repeatedly and repeatedly printing in the opposite direction. In the case of lines that are close to each other and adjacent to each other, in order to prevent the collapse of the load of the printing material, a structure in which the concave portions and the convex portions in the width direction are alternately opposed to each other is provided so that the closest distance between them, that is, the line gap is almost the same. Achieve by making uniform.

By performing screen printing using the screen according to the present invention, no additional steps are required,
The yield of P-plate making is also sufficiently improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The gist of the present invention will now be described based on embodiments with reference to the drawings. FIG. 1 is a drawing for explaining the basic structure of a screen according to the present invention, in which 1 and 4 mean the same shape and contour as the conductor lines 1 and 4 on the P-plate, 2 and Reference numeral 5 denotes an opening on the screen inside which the printing material can penetrate, which is indicated by a dotted line.
Reference numerals 3 and 6 respectively represent the printing material placed on the P-plate line through the opening of the screen.

That is, the lines A and B and the lines C and D in the figure correspond to the linear and curved lines, respectively. As is clear from the figure, the area of both ends of the opening 2 is set to be a kind of dumbbell-shaped larger than the central portion in the length direction of the conductor line.
There is the basic characteristic feature was, by using the fact that also determined the magnitude of the surface tension by the magnitude of the adhesion surface and collapsing phenomena in coming P- plate line from the material properties of the print material, printing of the print end portion It is indicated by the shaded area that the "chip" that the material takes on the screen film is prevented from occurring on the end side of the conductor line and that the printing material is uniformly loaded in the width direction. There is.

FIG. 2 shows a shape developed and deformed from FIG. 1, and 7 and 9 correspond to the line pattern surface on the P-plate surface. 8 in FIG. 1A is shorter than the opening 2 in FIG. 1A.
3 openings in series along the longitudinal direction of the conductor line.
Individually arranged and the shape of each opening is formed to be almost the same shape
did. That is, the subscript in brackets the corresponding a number of juxtaposed in the longitudinal direction of the short form. FIG B is common in the case of FIG. A, it indicates that the through openings print material P- plate on line is placed in the same form as in Figure 1. Of course, the modification of FIG. 2 can also be applied to the cases of FIGS. 1C and D. In other words, it is sufficient to bend each drawing of FIG. 2 in the longitudinal direction.

FIG. 3 is also a development of FIG. 1, and in the case where the straight road is bent and has corners, the corners are also enlarged as compared with other central portions in the longitudinal direction. To
Means forming an opening on the screen. That is, 12 in FIG. A represents the outer shape of the P-plate line, and 13 represents the shape of the opening on the screen. The meanings of other symbols and lines are exactly the same as before. Of course, it is permissible to apply the shape of FIG. 2 to the structure of FIG. 3 as in the case of FIG.

FIG. 4 is a drawing for explaining another basic structure of the screen according to the present invention, in which the line width and the pitch in screen printing in recent years have become 1 mm or less, and in the future it can be 100 μ or less. It corresponds to.

That is, reference numerals 15 and 16 in FIG. A and 19 and 20 in FIG. B indicate P-plate lines provided in close proximity to each other with a line width and a pitch being substantially the same, and wavy lines at both ends are the first line. In the present invention described with reference to FIG. 4, since the end portion is not directly involved, the end portion is intentionally used in a sense not shown. Same figure A
17 and 18 are openings of the screen which are the same as before, and are exactly the same as the shape of FIG. 2A. However, the ends whose area is larger than the central part in the lengthwise direction mutually expand the area of the other party.
That faces the central portion which is not large and is different.
The subscripts have the same meaning, indicating that the upper pattern 17 is provided with three dumbbell-shaped patterns and the lower pattern 18 is provided with four dumbbell-shaped openings of the same kind. For example, the facing portion in the length direction of the area expansion portion of 17 (1) and 17 (2) is the central portion of 18 (2),
(2) and the opposed portion in the length direction of the enlarged portion 18 (3) that represents that the respectively central face 17 (2). Fig B has line pattern to make the printing material placed on the P- plate line through the opening of Figure A, it indicates that the ho in the width direction Isuzu crucible to form the same gap.

A shape easily inferred from the above embodiments
Of course, a structure is also included in the gist of the present invention, but the most obvious example is a screen having a combination of some of the above-described embodiments.

[0022]

As is apparent from the above description, the present invention
Screen marking using a screen with openings based on
If printing is done, the "lack" in conventional screen printing
And “shorts” are prevented and additional
No process required, shortening the printing process and yielding P-plate making
The improvement of the ball is also expected.

[Brief description of drawings]

1 to 4 are views for explaining the shape of an opening for penetrating the printing material on the screen used for screen printing according to the present invention and the effect of the screen printing method using them, and FIG. 5 to FIG. FIG. 7 is a diagram for explaining the shapes of the openings on the screen which have been conventionally used in screen printing and the problems of the screen printing method using them.

[Explanation of Codes ] 1, 4, 7, 9, 12, 15, 16, 19, 20, ... P
-Plate line pattern shape, 1 ', 4', 7 ', 9', 12 ', 15', 16 ', 1
9 ', 20' ... P-Pattern on a plate line, 2,5,8,10,13,17,18,21 ... Screen opening and printing material placed on it, 3,6,11 , 14, 22 ... P-printing material placed on a plate track

Continuation of the front page (56) Reference JP-A-4-361589 (JP, A) JP-A-58-216250 (JP, A) JP-A-64-76702 (JP, A) JP-A-5-85078 (JP , A) JP-A-4-43086 (JP, A) JP-A-1-186388 (JP, A) JP-A-63-115169 (JP, A) Actually open 2-12868 (JP, U) Actually open 63-185275 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41N 1/24 B41C 1/14

Claims (3)

(57) [Claims] [Claim 1] of the conductor line patterns positioned on the printed circuit board main surface of the printing surface of the screen printing, a linear or pattern openings on the screen corresponding to the curved conductor line longitudinal edge
And set the large opening area than the central portion in the longitudinal direction
A screen in screen printing characterized by the above . 2. Among the conductor line patterns positioned on the printed circuit board main surface of the printing surface of the screen printing, the pattern opening on the screen corresponding to the straight or curved conductor lines, said conductor On the track
The plurality of openings are arranged in series along the longitudinal direction
The shape of the parts is formed to be substantially the same shape.
The screen in screen printing according to 1 . 3. The conductor line is folded at a predetermined position in the longitudinal direction.
While bending, the opening is bent along the conductor line.
To form both ends of the opening and the bent portion,
Set larger than the area of the part between the bent part and
The screen in screen printing according to claim 1 or 2 .