JPH0314062Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] The present invention is a screen printing device for conductive paste that fills paste into through holes of a substrate by printing.

In the work process using such a printing machine, the paste seeping out from the through holes contaminates the surface of the substrate table. To prevent this, conventionally, paper was manually inserted between the substrate and the substrate table. The work was done by inserting sheets such as, but this work was extremely inefficient and complicated, so
In order to improve this, the above-mentioned sheets are automatically fed and inserted between the substrate and the substrate table at regular intervals, thereby increasing efficiency by automating the work.

[Industrial Application Field] The present invention relates to a screen printing device for conductive paste, and in particular, when filling a board with paste with through holes, it prevents the paste pushed out from the through holes from contaminating the board table. The invention relates to an automatic sheet feeding mechanism for

In recent years, thick film printing has been used in various manufacturing processes for semiconductor devices, hybrid ICs, display devices, and the like.

This thick film printing usually involves applying an emulsion to a mesh-like mask, applying a predetermined pattern to the emulsion, bonding it to a substrate, and applying the paste to be printed over the mask using a squeegee. By moving the paste while pressing it, the paste is printed according to the pattern of the mask.

However, for example, in the manufacturing process of IC packages, there is a printing process in which a paste such as tungsten conductive material is filled into the through holes of the substrate before firing, which are made by kneading ceramic powder and a binder. The paste pushed out by the squeegee adheres to the substrate table.

Conventionally, a sheet of paper or other material is inserted between the table and the substrate to prevent contamination of the substrate table, but replacing the sheet is manual and inefficient, so improvements are desired. ing.

[Prior Art] FIG. 3 is a perspective view of main parts of a conventional screen printing apparatus for conductive paste.

There is a printing machine 2 and a substrate table 3 arranged on a printing device stand 1, and the substrate table is used to place a substrate 5 having a through hole 4 between the substrate table position on which the substrate is placed and the position of the printing machine. It moves back and forth on the rail 6.

The printing press 2 is equipped with a screen mask 7 under which a substrate table 3 can be moved in and out.

Further, in order to press the screen mask 7 and print the paste on the substrate, a squeegee 8 that moves on the mask surface is moved left and right on the mask surface as shown by an arrow by a hydraulic device.

Conventionally, in order to print on a board, a standard sheet 9 such as Indian paper, for example, is manually inserted between the board table 3 and the board 5, and the paste seeping out from the through hole 4 is deposited on the board table. This prevents it from adhering to the surface.

This manual replacement of the sheet has the disadvantage that it is necessary to replace each board one by one, which significantly reduces work efficiency.

[Problems to be solved by the invention] In conventional conductive paste screen printing equipment, when filling a board with through holes with paste, each printed board is shielded with a sheet to prevent contamination of the board table. The problem is that the sheets have to be replaced manually, which reduces work efficiency.

[Means for solving the problems] The present invention proposes a screen printing device for conductive paste to solve the above problems.
The solution is to use a screen printing device for conductive paste, which is equipped with a board table on which the board is placed, a screen mask, and a squeegee. In order to prevent the paste from contaminating the substrate table, a sheet that is opaque to the conductive paste, which is automatically fed at a fixed pitch, is inserted between the substrate and the substrate table to reduce the time required to replace the sheet. It is a streamlined version of

[Function] In order to prevent the substrate table on which a substrate with through holes is placed from being contaminated by the paste exuding from the through holes, the present invention provides an automatic conductive paste that is not permeable to the conductive paste. By using a feeding roll sheet and replacing the board by moving the roll sheet one by one at predetermined pitches, the replacement time is significantly shortened and work efficiency is improved.

[Embodiment] FIG. 1 shows a perspective view of the main parts of a screen printing apparatus according to the present invention.

There is a printing machine and a substrate table 13 arranged on a printing device stand 11, and the substrate table carries a substrate 15 having a through hole 14 and moves back and forth between a position where the substrate is placed and a printing position. .

The printing machine includes a screen mask 16 and a squeegee 17 that presses the paste on the screen mask surface, and this squeegee is connected to a hydraulic device 18.
to move on the mask surface in the direction of the arrow. The automatic sheet feeding device 19 and automatic sheet receiving device 20 according to the present invention are placed on the side surface of the substrate table,
When the printed substrate is removed, the control device 21 sends out a sheet 22, for example a roll sheet, with a length corresponding to one substrate.

Normally, the time for one printing is 16 to 20 seconds, but this varies depending on the size of the substrate, so a versatile control device is required. It can be easily controlled by using an off switch or a photoelectric device.

FIG. 2 is a schematic front view of main parts showing an example of a sheet feeding device.

The sheet 22 on the substrate table 13 is transported by an automatic sheet feeding device 19 and an automatic sheet receiving device 20. The device 20 is placed on the side surface of the substrate table, and a sensor 23 detects when the printed substrate is removed. Then, the control device 21 is activated, and the sheet 22 is sent out in a length corresponding to one board.

By adopting such an automatic sheet feeding mechanism, automation of the printing apparatus becomes possible, and work efficiency is significantly improved.

[Effects of the Invention] As described above in detail, by installing the automatic sheet feeding device according to the present invention, extremely efficient printing work becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of the screen printing apparatus of the present invention, FIG. 2 is a front view of the main parts of the sheet feeding device of the invention, and FIG. 3 is a perspective view of the main parts of the conventional screen printing apparatus. In the figure, 11 is a printing device stand, 12 is a printing machine, 13 is a substrate table, 14 is a through hole, 15 is a substrate, 16 is a screen mask, 17 is a squeegee, 18 is a hydraulic system, 19 is an automatic sheet feeding device, 20 21 shows an automatic sheet receiving device, 21 a control device, 22 a seat, and 23 a sensor, respectively.

Claims (1)

[Scope of utility model registration request] A substrate table on which a substrate having a through hole is placed; a screen mask and a squeegee for filling the through hole of the substrate with conductive paste; A screen printing apparatus for a conductive paste, comprising a device for automatically feeding and inserting a non-transparent sheet into the conductive paste at predetermined intervals between the surface of the substrate table and the conductive paste.