JPS5816590A - Screen plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screen plate used for screen printing.

Recently, there has been an urgent need to put ceramic substrates with ultra-high density wiring into practical use. This substrate has 20 to 30 conductive layers and 20 to 30 insulating layers 1, respectively. In this lamination method, the thickness j,
A printing lamination method in which conductor and insulating layers are alternately printed and laminated by screen printing on one 6 mrn green sheet,
Very thin green sheet 20-3 with a thickness of 0.2 am
There is a sheet lamination method in which a conductor pattern for each layer is printed on one sheet, and then the sheets are aligned and laminated. In the case of the printed lamination method, since the insulating layer needs to be printed two to three times for each conductor layer, 100 to 150 printings are required to manufacture one board. Further, the number of through holes (hole diameter 0.15 msnφ) required for interlayer conduction is as large as 600,000 per substrate, and it is difficult to form these through holes by printing. For these reasons, the latter sheet lamination method is being actively studied.

The sheet lamination method uses a thin green sheet (raw ceramic sheet) with a thickness of 0.2 mm, but since this sheet is like a clay plate, it has no stiffness and is easily broken. In order to avoid deforming the sheets, which are difficult to handle, and to improve the accuracy of alignment during stacking, #! The method shown in Figure 1 is being considered. In this method, a green sheet 1 is pasted on a picture frame-like frame 2 with adhesive, and subsequent through-hole formation, printing, and lamination are performed using positioning guide holes 3 provided at both ends of the frame 2. It's a method. The frames used in this method require high dimensional accuracy and are very expensive. Since it is necessary to recycle and use the nine-frame frame, an extensive adhesive removal process is required. In addition, there are many drawbacks such as distortion of the frame during the removal process, adhesive remaining in the positioning guide hole, and poor yield of frames that can be recycled. Methods are being considered.

In this method, when fixing the green sheet to the frame, the green sheet 1 is sandwiched between two frame-like frames 2' and 2'' and fixed with screws, etc., without using adhesive. Now, fill the through cape 4 with conductive paste, and fill it with the side with the larger diameter of the easily inserted through hole (the diameter of the through hole is different on the front and back sides).

) can be printed. Second, it can be printed on a surface suitable for fine line printing (green sheets have different surface roughness on the front and back sides). Furthermore, although through-hole drilling has many advantages, such as being able to drill from a surface where defects are unlikely to occur, there is a major problem in that it cannot be printed with currently commercially available screen plates.

FIG. 5 is a schematic cross-sectional view when printing using a conventionally used commercially available screen plate. Figure 5 shows the vacuum l
After fixing and setting the green sheet 1 to the #l marking frames 2' and 2'' using the second WJ on the print stage 7 equipped with the J pulling plate 8, the green sheet 1 is evacuated through the exhaust hole 9 and vacuum suction is applied, and the screen is This is a state in which a mesh (screen) 6 is stretched over a frame 5 and a screen plate on which a printing pattern is formed is fixed.When printing in this state, as shown in Fig. 4, a green sea) 1
The screen mesh contacts the fixed frame 2', 2'' and cannot print on the print surface of the green sheet. In this case, if you press down the mesh 6 with the squeegee 10 at s!l.

The mesh 6 may be torn at the part A, the printed pattern may be honey-shaped, and the positional deviation of the pattern may be large, resulting in poor printing.

To use the conventional screen plate, frame-like frame 2°
, 2" must be made thinner, or the green sheet must be made larger. However, if the frame 2', 2" is made thinner, screwing, variations in the thickness of the green sheet,
Twisting or deformation may occur due to handling, etc.), high precision alignment (±20
μm) and cannot withstand repeated use. Also, green sheet 1 is 9! There are many practical problems, such as weak IK, deformation due to its own weight and sag when made over a large area, and misalignment between layers during lamination due to highly precisely printed pattern dE f shape.

On the other hand, it is possible to make the screen version smaller,
In reality, since the print pattern occupies a large proportion of the size of the screen plate, the plate separation is poor even when printed, and short circuits and positional deviations of wiring patterns occur frequently. There are many problems, such as the fact that it may not be possible to squeegee the entire surface of the printed pattern.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a screen plate that can print with high precision on a printing surface with steps.

The screen plate according to Akira Hongo is fixed by a frame that protrudes toward the screen plate side.The screen plate has a size larger than the width of the printing substrate on which the printing material is printed, and the screen portion having the printing pattern is A screen characterized in that it is stretched over a fixed rod that is slightly smaller than the width of the printing medium and projects toward the printing medium, and a screen without a printed pattern is stretched between the screen frame and the fixed rod. It is a version.

In a preferred embodiment of the screen plate according to the invention,
A spacer having a standard gap thickness is provided on the periphery of the screen having the printing pattern on the side that is in contact with the printed material.

In another preferred embodiment of the screen plate according to the invention, the thickness of the fixing rod is 2 to 20 mm.

Hereinafter, a screen plate according to the present invention will be described in detail based on drawings of embodiments. Figure @5 is a schematic cross-sectional view of an embodiment of the screen plate according to the present invention.

To make this screen version, first, the size is 100'.
A screen with a printing pattern (MEC: L) on which a printing pattern of X100i+m was formed (composed of emulsion and metal).

) 6 with a tensile strength of 9 to 15 kg, the printed pattern is in the center, and the outer diameter is 150) 1.
50mm, inner diameter 130x130mm, thickness 2~20m
A stainless steel screen (mesh) (165
~250 mesh) 6I is stretched with a tensile strength of 12 to 15 kg and adhered to the opposite side of the fixed frame 11 to which the screen 6 was previously adhered. At this time, at the same time, glue the reinforcing frame 12 on the opposite side of the screen 6' glued to the fixed frame 11.
Secure with adhesive. The reinforcing frame 12 is fixed with adhesive to prevent the solvent from seeping in since the adhesive is sensitive to solvents, and to prevent peeling from the end surface since the bonded surface has low beer strength. This also applies to the printed patterned screen 6 adhered to the fixed frame 12, but the subbed t13, which will be described later, also plays this role.

Once the adhesive has hardened, the screen 6 inside the fixed frame 11 is
' and the screen 6 outside the fixed frame 11 are removed, the tensile strength of the screen 6' is adjusted to 12 to 14 kg, and then fixed to the screen frame 5 of 400 x 400 mm with adhesive or with a fixture. Further, a spacer 13 having a standard gap thickness is bonded to the peripheral edge of the screen 6 with a printing pattern that is in contact with the printed material, that is, to the opposite side of the portion bonded to the fixed frame 11. In screen printing, the gap between the screen and the printing surface is a very important condition. However, in this screen version, the screen surface is frame 2.
It is not possible to adjust the ninth gap that goes inside the '. With this measure, the spacer 13i has the same thickness as the reference gap.

FIG. 6 is a schematic cross-sectional view of an enlarged end portion (B section in FIG. 115) of a screen plate having a shape of "m-t" used for actual printing.As shown in FIG. 0, the green sheet fixing frame 2 Even though there was a difference in level between ' and the green sheet 1, good printing was possible.In actual printing, there is a limit to the thickness of the screen fixing frame 11.

1! lIm] When it gets thinner, there is no difference with no fixed frame, 2
011Im) When the thickness increases, the shape of the printed pattern deteriorates rapidly. This is to ensure that the printing pattern section moves when the squeegee moves and the plate separates.

Since the screen plate according to the present invention is constructed and used as described above, even when printing a large screen plate (as compared to the width of the printing substrate) and a printing substrate fixed with a frame projecting from the screen plate side. By using the screen plate of the present invention, it is possible to print with high precision, and by laminating green sheets printed in this way, it is possible to manufacture a ceramic multilayer wiring board.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a green sheet fixed with a conventional frame, Fig. 2 is a sectional view of an example of a green sheet and fixed frame to be printed using the screen plate of the present invention, and Fig. 3 is a perspective view of a green sheet fixed with a conventional frame.
4 and 4 are schematic cross-sectional views showing the state of printing on the green sheet shown in FIG. 2 using a conventional screen plate, FIG. 5 is a cross-sectional view of an embodiment of the screen plate of the present invention, and FIG.
5 is a schematic partial cross-sectional view showing a state in which printing is performed using the screen plate shown in FIG. 5. FIG. 1... Green sheet, 2, 2', 2"... Green sheet fixed frame, 5... Screen frame, 6... Mark J
iilJ patterned screen (mesh), 116
°...Screen (mesh) without a printing pattern,
7... Printing stage, 8... Vacuum suction plate, 11...
- Screen fixing frame, 12... Reinforcement frame, 15... Spacer. Agent Patent Attorney Bo 1) Lixin Gu l Figure 1 Ya 21!1 )X3 [! 1 g4 Figure z, syA tcA /1

Claims (3)

[Claims] (1) In a screen plate that is fixed by a frame that protrudes toward the screen plate side and is larger than the width of the printing material on which the printing material is printed, the screen portion having the printing pattern is larger than the width of the printing material. A screen plate characterized in that a slightly small fixed frame is stretched and protrudes toward the printing substrate, and a screen without a printing pattern is stretched between the screen frame and the fixed rod. (2) The screen plate according to claim 1, wherein a spacer having a standard gap thickness is provided on the periphery of the screen having the printing pattern that is in contact with the printing material. (3) The screen plate according to claim 2, wherein the fixing rod has a thickness of 2 to 20 mm.