JP2000062139A - Screen printer and printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a forward end shape of squeegee in which reproducibility and initially set accuracy can be ensured by confirming the shape of squeegee from the underside of an object to be printed by means of a transparent screen and the object to be printed before a wiring is formed on a green sheet. SOLUTION: After a squeegee g is set in an optimal state at the time of starting printing, a printing press stage a is moved to a box d incorporating a sensor and movement of the squeegee g is stopped at the sensor detection coordinate of the box d. A displacement gauge sensor b is then scanned in the direction perpendicular to the movement of the squeegee under that state and the degree of deformation of the squeegee g is stored as an initial set value. Subsequently, the screen is replaced by a transparent screen h for every specified number of printed sheets and the shape of the squeegee is detected in order to perform automatic adjustment by altering the height of the stage a. According to the method, a forward end shape of squeegee ensuring reproducibility and initially set accuracy can be obtained.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a screen printing method and apparatus.

[0002]

2. Description of the Related Art A method for manufacturing a ceramic multilayer wiring board is as follows.
Many are described in JP-A-63-103273 and the like.

A method of manufacturing a ceramic multilayer wiring board includes
The following procedures are included. First of all, a through hole is made in the green sheet. Second, the conductive paste is used to fill the through holes and form the wiring. And third, stack the green sheets. Finally, it becomes a substrate by sintering.

Among these, the wiring technique of the second stage is
It is generally known that a conductive paste is supplied onto a screen made of a metal material, and a squeegee (elastic plate) is pressed against the upper side of the screen and moved in parallel to print on an object to be printed (green sheet etc.). Such a screen printing method and apparatus are disclosed in Japanese Patent Publication No. 1-992.
86, etc.

In order to maintain the printing film thickness and the printing shape accuracy with high accuracy, the squeegee condition is checked by periodically measuring the squeegee condition with a measuring instrument such as a caliper.
In case of non-standard, it is necessary to adjust by changing various adjusters. As a method for checking the shape of the squeegee, the weight at the time of printing is applied through the screen and the weight is measured. Alternatively, set the amount of deformation of the squeegee by crushing it (squeegee drop amount) in advance and use the method to determine the contact shape. The shape of the squeegee tip that the squeegee is actually working on, regardless of which method is used, is
The printing operation is performed without knowing whether the reproducibility and the initially set accuracy have been obtained.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a squeegee contact shape during a printing operation is measured by a displacement screen in a short time by using a displacement screen, and analysis / evaluation is made, and the contact shape is corrected and controlled. Thus, the squeegee tip shape should be reproducible and have the initially set accuracy.

[0007]

A ceramic multilayer substrate having a constant wiring film thickness is provided with a permeable squeegee (rubber) and a squeegee (rubber) from the lower side of the printing object before a wiring is formed on a green sheet. This is achieved by confirming the shape of the elastic body such as a plate made of steel.

[0008]

1 to 4 show an embodiment of the present invention.

Generally, the wiring film thickness is determined by the hardness of the squeegee, the speed, the attack angle and other conditions of the squeegee.

In order to keep this film thickness constant, it is necessary to manually confirm and adjust the squeegee state as described in the above-mentioned prior art.

According to the present invention, this squeegee state is measured by a displacement sensor incorporated in the main body of the printing machine, the squeegee state is controlled by changing the stage height, and stable printing of a film thickness can be continuously performed. It is a thing.

Hereinafter, details of a method for stabilizing the printed wiring film thickness will be described.

FIG. 1 shows the structure of a wiring printer according to the present invention. This printing press has a general printing press stage a with a top surface transparent box d having a displacement sensor b and an illumination c built in at the same plane height.

2 to 3 show how to use this printing machine.

A general wiring printing method is a method in which a conductive paste f is supplied onto a screen e, a squeegee g (elastic plate) is pressed against the upper side of the screen e, and a parallel movement is carried out for printing. When printing is performed in this way, the squeegee g state changes, and the printed film thickness becomes unstable. Therefore, it is necessary to check the state of the squeegee g every time a certain number of copies are printed. Therefore, in this method, first, the squeegee g is set to the optimum state at the start of printing, and then the printing press stage a is moved to the horizontal sensor built-in box d, and the squeegee g movement is performed up to the sensor detection coordinates of the box d part and stopped.

Then, in this state, as shown in FIG. 3, the displacement sensor b is scanned in the vertical direction of the squeegee motion, and the degree of deformation of the squeegee g shape taken in is stored as an initial setting value.

After that, the screen e is replaced by a transparent screen h after every fixed number of prints, the shape of the squeegee g is detected by the above method, and the height of the stage a is automatically adjusted.

[0018]

According to the above-mentioned invention, it is possible to continuously form a wiring having a stable wiring film thickness, and the following effects can be given.

Since additional repair due to wire breakage is unnecessary,
The process can be shortened.

Since the design of reliability and durability evaluation of the additional portion of the wiring is unnecessary, the evaluation period can be shortened.

Since it is possible to form a wiring having a stable cross-sectional area, it is possible to suppress variations in signal propagation speed.

It is possible to reduce the number of adjustment steps required for continuous printing.

[Brief description of drawings]

FIG. 1 is a sectional view of a printer according to the present invention.

FIG. 2 is a sectional view of a sensor box portion of a printing device showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view in the scanning direction of a displacement gauge sensor unit of a printing apparatus showing an embodiment of the present invention.

[Explanation of symbols]

a Printing machine stage section b Displacement meter line sensor c lamp lighting d Top transparent sensor box e screen f Conductive paste g squeegee h transparent screen

Continued front page    F term (reference) 2C035 AA06 FA27 FC07 FD01 FD15                       FF26                 2H113 AA01 AA05 BA10 BA14 BB22                       BB32 BC12 CA17                 5E343 BB72 FF02 FF04 FF13 FF30                       GG11

Claims (2)

[Claims] 1. A screen printing method of supplying a conductive paste to a print target by a squeegee operation after aligning the print target and the screen, and forming a squeegee contact shape during operation through a transparent screen after printing a certain number of sheets. A screen printing method characterized by performing actual measurement analysis and evaluation judgment in a short time using a displacement meter, etc., and correcting and controlling the printing press stage. 2. A screen printing apparatus having means for aligning a printing object with a screen and means for supplying a conductive paste to the printing object by a squeegee operation, which operates through a transparent screen after printing a certain number of sheets. A screen printing apparatus comprising: a means for measuring, evaluating, and determining the contact shape of a squeegee in the middle by a displacement meter or the like in a short time;