JPH0445939A - Printer - Google Patents

Abstract

PURPOSE:To easily perform accurate registration when conductor paste is printed on both sides of a circuit substrate by a method wherein a first reflecting mirror and a second reflecting mirror which register a screen plate to a circuit substrate are installed to a printing table. CONSTITUTION:A first reflecting mirror 11 and a second reflecting mirror 13 are fitted to a printing table 10. Then, a printing base 14 is set on the printing table 10 to which the reflecting mirror 11 is installed, and a first side screen plate negative film 12 is fixed onto the printing base 14. Then, a ceramic substrate 9 is fixed by registration onto said negative film 12. By registering a second side by refering to a printing pattern formed by printing on the first side by providing the first reflecting mirror and the second reflecting mirror 13 in the printing table 10, the ceramic substrate 9 of which the printing patterns on the first side and the second side registered with each other, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a printing apparatus for circuit boards made of ceramic substrates (including ceramic multilayer substrates) used in hybrid integrated circuits and the like.

BACKGROUND OF THE INVENTION In recent years, electronic devices have become smaller and more densely packaged, and the ceramic substrates mounted on them are also changing from single-sided to double-sided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A conventional printing apparatus for printing circuit boards such as ceramic boards will be described below with reference to the drawings.

Figure 2 shows the main parts of a conventional ceramic substrate printing device. In the figure, 1 is a squeegee rubber, 2 is a conductive paste, 3 is a screen plate, 4 is a ceramic substrate,
5 is a print table.

The operation will be explained below.

A predetermined screen plate is attached to a printing machine, and a ceramic substrate 4 is positioned and set on a printing table 5.

Next, in order to correctly print the printing pattern on the ceramic substrate 4, after adjusting and aligning the position of the screen plate 3, the conductive paste 2 is placed on the screen plate 3, and the squeegee rubber 1 is moved. As a result, a printed pattern is formed on the ceramic substrate 4. After drying, a printed pattern is generally formed on the opposite side of the ceramic substrate 4 using the conductive paste 2 in the same manner as described above.

Problems to be Solved by the Invention However, in the conventional printing apparatus described above, when conducting an electrical continuity test after printing and drying the conductive paste 2 on both sides of the ceramic substrate and firing, the printed pattern on both sides of the ceramic substrate 4 may be misaligned. Therefore, there was a problem in that it was very difficult to align the measurement probe of the electrical continuity tester.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide an excellent printing device that can easily perform correct positioning when printing conductive paste on both sides of a circuit board.

Means for Solving the Problems In order to achieve the above object, the present invention provides a printing table with a first reflecting mirror and a second reflecting mirror for aligning the screen plate with the circuit board.

Effect of the present invention With the above-described configuration, after printing and drying a paste such as a conductor on the first side of a circuit board, the circuit board is turned over and when the paste such as a conductor is printed on the second side, the printing table is used. A negative film of a screen plate for printing on the first side is positioned and fixed on top, and a reflective mirror installed in the printing table is used to distinguish between the printing pattern printed on the first side of the circuit board and the first side. This is designed to overlap the negative film pattern of the screen plate for surface printing.

Therefore, it is possible to easily align the second side printing screen plate provided with the printing pattern to be printed next on the second side of the circuit board, and when printing the conductive paste on the second side, the screen plate for printing the second side can be easily aligned. The pattern printed on the first side and the pattern on the second side will no longer be misaligned.

Embodiment A printing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of the main parts of a printing device in one embodiment of the present invention. In the figure, 6 is a squeegee rubber, 7 is a conductive paste, 8 is a screen plate, and 9 is a circuit board. A ceramic substrate, 10 a printing table on which a first reflecting mirror is installed, 2 a negative film of the screen plate 8, 3 a second reflecting mirror, and 14 a printing table.

As shown in the figure, a first reflecting mirror 11 is placed on the printing table 10.
Then, the second reflecting mirror 13 is attached, and then the printing table 14 is set on the second side of the printing table 10 on which the reflecting mirror 11 is installed, and the negative film 12 of the screen plate of the first surface circumference is placed on the second side of the printing table 14. to be fixed. Next, the negative film 12
The ceramic substrate 9 is positioned and fixed on the second side.

The operation will be explained below.

FIG. 1 shows a conductive paste 7 on the second surface of a ceramic substrate 9.
This shows a case where a negative film 12 of a screen plate (not shown) on the first side is fixed on the printing table 14, and a conductive pattern printed on the first side of the ceramic substrate 9 is printed. The pattern of the negative film 12 of the screen plate on the first side facing downward and the printing pattern printed on the first side of the ceramic substrate 9 are transferred to the first reflecting mirror 11 installed in the printing table 10 and the second reflecting mirror 11 installed in the printing table 10. It is fixed while aligning using the reflecting mirror 13 of. Next, a screen plate 8 having a second surface circumference is aligned with the second surface of the fixed ceramic substrate 9, and a conductive paste 7 is placed on it and printed. In this way, a ceramic substrate 9 with no misalignment of printed patterns on the first and second surfaces is obtained.

As described above, according to the above embodiment, by providing the first reflecting mirror 11 and the second reflecting mirror 13 in the printing table 10, the second reflecting mirror 11 and the second reflecting mirror 13 are formed based on the printing pattern printed on the first surface. By aligning the positions of the surfaces, it is possible to obtain a ceramic substrate 9 in which the printed patterns printed on the first surface and the second surface are not misaligned.

In this embodiment, instead of the first screen negative film 12 set on the printing table 14, a transparent film having marks useful for positioning may be used.

Further, instead of the ceramic substrate 9, it is also possible to use a circuit board made of glass epoxy resin or the like.

Effects of the Invention As is clear from Example 1, the present invention provides a first reflector and a second reflector for aligning the screen plate to the circuit board on the printing table, thereby improving the alignment of the circuit board. This has the effect that the printed patterns on the first and second surfaces can be easily aligned, and therefore a circuit board having printed patterns on both sides without misalignment can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a printing apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a conventional printing apparatus. 6...Squeegee rubber, 7...Conductor paste, 8...Screen plate, 9...
Ceramic substrate (circuit board), 10... Printing table, 1 piece... First reflecting mirror, 13...
...Second reflecting mirror, 14...Printing table.

Claims (1)

[Claims] In a printing apparatus, a printing table is installed on which a circuit board is placed on a printing table, and a conductive paste is printed on the upper surface of the circuit board by moving a squeegee rubber from above the printing table through a screen plate. A printing apparatus comprising a table provided with a first reflecting mirror and a second reflecting mirror for aligning the screen plate with the circuit board.