JPH0752358A - Holding equipment of board of screen printer - Google Patents

Abstract

PURPOSE:To enable execution of screen printing of excellent printing precision by providing a backup holding a printed circuit board, a recessed type backup block closing up the backup, and an elastic body being fitted fast on the top surface of the block and brought into close contact with the printed circuit board. CONSTITUTION:The lateral side and the upper side of a printed circuit board 1 are clamped by a support block 2 provided on a printing table 3. Besides, the lower side thereof is held by a backup 4a being an inactive liquid. This backup 4a is filled up in a backup block 5 formed in a recessed type by a liquid supply device 6. A through hole for supplying the backup 4a is provided in the support block 2 and, besides, an elastic body 7a to be brought into close contact with the printed circuit board 1 is fitted fast to the upper end of the backup block 5. When the printed circuit board 1 is carried onto the printing table 3, the backup block 5 rises, and when the elastic body 7a is brought into close contact with the lower side of the printed circuit board 1, the backup 4a is filled up so that the board be supported with an equal pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate holding device for a printed substrate screen printing machine that prints an adhesive, cream solder or the like on a printed substrate.

[0002]

2. Description of the Related Art Generally, a substrate holding device for a printed circuit board screen printing machine is constructed as disclosed in, for example, Japanese Utility Model Laid-Open No. 63-138968. That is, as shown in FIG. 4, the apparatus includes a printing table 3 having a support block 2 for clamping the side surface and the upper surface of the printed circuit board 1, and a backup block 4 positioned on the printing table 3 and supporting the substrate from the lower surface. And supports the printed circuit board from at least two directions during screen printing.

[0003]

Compared with the method of pushing up the lower surface of the printed circuit board with a plurality of pins, such a conventional device responds to the unevenness when there are parts or the like on the lower surface of the printed circuit board. Since there is no need to change the pin arrangement by using the method, there is an advantage that the process is simplified. However, since only the edge of the printed circuit board is pressed, it is not possible to support the entire lower surface of the circuit board with uniform pressure.
There is a problem that the warp of the substrate cannot be completely corrected and the printing accuracy is poor.

The present invention has been made in view of the above-mentioned conventional problems, and even when the lower surface of the printed board is uneven, the entire lower surface of the board can be supported by a uniform pressure, and screen printing with high printing accuracy can be performed. It is an object of the present invention to provide a printed circuit board holding device.

[0005]

In order to solve the above problems, the present invention provides a backup for holding a printed circuit board, a concave backup block for sealing the backup, and a printed circuit board fixed to the upper surface of the backup block. An elastic body that is in close contact is provided. Further, the present invention is configured such that a supply device for filling the backup in a space sealed by the backup block and the printed circuit board is provided.

[0006]

With the above structure, when the printed circuit board is carried onto the printing table, the backup block rises to bring the elastic body and the lower surface of the printed circuit board into close contact with each other, and further back up to the space enclosed by the printed circuit board and the backup block. Is filled, the entire lower surface of the printed board is supported with a uniform pressure. Further, the pressure can be easily set by using the supply device when the backup is filled in the backup block.

[0007]

[First Embodiment] FIG. 1 is a schematic configuration diagram of a first embodiment of the present invention. The same members as those in the conventional example shown in FIG. 4 will be described using the same reference numerals. The side surface and the upper surface of the printed circuit board 1 are clamped by a support block 2 provided on a printing table 3. The lower surface thereof is held by a backup 4a which is a perfluorotrialkylamine-based inert liquid. The backup 4a is filled in the concave backup block 5 by a chemical solution metering pump 6 which is a liquid supply device. In addition, a backup 4 is included in the support block 2.
A through hole for supplying a is provided, and an elastic body 7a made of silicon rubber or the like and adhered to the printed circuit board 1 is fixed to the upper end of the backup block 5.

When the printed circuit board 1 is carried onto the printing table 3, the backup block 5 rises and the elastic body 7
a and the lower surface of the printed circuit board 1 are in close contact with each other. Next, the chemical metering pump 6 is connected to the printed circuit board 1 and the backup block 5.
The backup space 4a is filled in the space sealed by and works so as to support the entire lower surface of the printed board 1 with a uniform pressure.

Therefore, the warp of the printed circuit board 1 is corrected and the screen printing can be performed with high accuracy. In this embodiment, in particular, an inert liquid that does not easily shrink is used as a backup, and therefore, there is an effect that the substrate supporting force is stronger than in other embodiments.

[0010]

[Second Embodiment] FIG. 2 is a schematic configuration diagram of a second embodiment of the present invention. The side surface and the upper surface of the printed circuit board 1 are clamped by the support block 2 provided on the printing table 3. Further, on the lower surface of the printed circuit board 1, a backup 4b filled in advance in the backup block 5 is provided.
Is crimped, and backup block 5 is attached to the bottom edge.
The elastic body 7a individually attached to the upper end is in close contact. First above
The difference from the embodiment is that the backup 4b is a fine granular material or powdery material such as Teflon, and that the backup supply device such as the chemical solution metering pump 6 is not used in advance.

When the printed board 1 is carried onto the printing table 3, the backup block 5 rises, and the backup 4b and the elastic body 7a come into close contact with the entire lower surface of the printed board 1. Therefore, the backup 4b is the printed circuit board 1
It works to support the entire lower surface with uniform pressure.

In the present embodiment, since solid fine particles or powder are used as the backup 4b, it is not necessary to supplement the backup every fixed number of times of printing. Therefore, the tact in the printing process can be shortened as compared with the other embodiments.

[0013]

[Third Embodiment] FIG. 3 is a schematic diagram of the third embodiment of the present invention. The side surface and the upper surface of the printed circuit board 1 are clamped by the support block 2 provided on the printing table 3. On the other hand, the elastic body 7b fixed to the upper end of the backup block 5 is in close contact with the lower surface of the printed circuit board 1. The elastic body 7b receives a certain pressure by the backup 4a filled in the backup block 5 by the chemical solution metering pump 6. The shape and configuration of the elastic body 7b differ from those of the other embodiments.

When the printed circuit board 1 is carried onto the printing table 3, the backup block 5 rises and the elastic body 7
b adheres to the entire lower surface of the printed circuit board 1. Then, the space sealed by the elastic body 7b and the backup block 5 is filled with the backup 4a by the chemical solution metering pump 6, so that the elastic body 7b uniformly presses the entire lower surface of the printed board on which the components are mounted. Work to support in.

According to this embodiment, since the elastic body 7b covers the entire upper opening of the backup block 5, even in a multilayer printed circuit board having a through hole, the backup 4a does not leak from the through hole and the printed circuit board is kept at a constant pressure. There is an effect that can support.

[0016]

According to the present invention, by pressing the lower surface of the printed circuit board by the backup filled in the concave type backup block, the entire lower surface of the printed circuit board can be supported with a uniform pressure. Even if there is unevenness or warpage, it is possible to obtain the effect of enabling screen printing with good printing accuracy.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a substrate holding device of a screen printing machine according to a conventional example of the present invention.

FIG. 2 is a schematic sectional view of a substrate holding device of a screen printing machine according to a first embodiment of the present invention.

FIG. 3 is a schematic sectional view of a substrate holding device of a screen printing machine according to a second embodiment of the present invention.

FIG. 4 is a schematic sectional view of a substrate holding device of a screen printing machine according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Printed circuit board 2 Support block 3 Printing table 4a, 4b Backup 5 Backup block 6 Chemical solution metering pump 7a, 7b Elastic body

Claims (2)

[Claims] 1. A printed circuit board screen printing machine for printing an adhesive, cream solder, etc. on a printed circuit board,
A substrate holding device for a screen printing machine, comprising: a backup that holds a printed circuit board; a concave backup block that seals the backup circuit; and an elastic body that is fixed to the upper surface of the backup block and is in close contact with the printed circuit board. 2. A supply device for filling the backup formed in the space formed in the backup block.
A substrate holding device for the screen printing machine described.