JPH06226961A - Code mark printer - Google Patents

Abstract

PURPOSE:To provide a code mark printer which can print, at a low cost, an identifying code mark wherein a thickness of the code mark does not cause bleeding of creamy solder in a silk screen printing process of the creamy solder on a printed board. CONSTITUTION:In a code mark printer which prints an identifying code mark 2 on a printed board 1, a heating means 5 which heats a code mark printing position of the printed board 1 before code mark printing, and a printing means 3 which prints, without any contact, the code mark on the heated code mark printing position by an ink jet system are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for processing a printed circuit board for an electronic circuit, and more particularly to a code for providing a printed circuit board with an identification code mark for managing the processing history of the printed circuit board in the mounting process. The present invention relates to a mark giving device.

[0002]

2. Description of the Related Art In recent years, in the process of mounting a printed circuit board, in order to manage the processing history of each printed circuit board, a code mark for identification is attached to each printed circuit board, and the code mark is read in each process to The processing history is managed.

In order to give this kind of identification code mark to a printed circuit board, it has been conventional to use the Japanese Patent Publication No. 4-4 shown in FIG.
The method described in Japanese Patent No. 179184 is generally used.

As shown in FIG. 2, Japanese Patent Publication No. 4-17918.
In the conventional example described in Japanese Patent Publication No. 4, the code mark label 102 on which a code mark for identification is printed is glued to the ear portion of the printed circuit board 101.

[0005]

However, in the structure of the above-mentioned conventional example, the thickness of the glued code mark / label 102 is about 10 to 20 μm. There is a problem that the gap between the screen and the screen becomes so large that the cream solder oozes out, and the bleeding of the cream solder causes defects.

Further, the code mark label 102 is about 1
There is a problem that the cost is high with about 0 yen / sheet.

The present invention solves the above-mentioned problems, and in a screen printing process of cream solder on a printed circuit board, a code mark for identification in which the thickness of the code mark does not cause the bleeding of the cream solder is provided at a low cost. Another object is to provide a code mark printing device capable of printing on a printed circuit board.

[0008]

In order to solve the above-mentioned problems, a code mark printing apparatus of the present invention includes heating means for heating a code mark printing position on a printed circuit board before code mark printing, and a heated code. It is characterized by having a printing means for printing a code mark in a non-contact manner by an inkjet method at a mark printing position.

Further, according to the present invention, a printed board carry-in means, a positioning means for positioning the code mark printing position of the carried-in printed board, and a printed board on which the code mark is printed are carried out to the above-mentioned code mark printing apparatus. It is preferable to add a carrying-out means for carrying out.

[0010]

The code mark printing device of the present invention prints a code mark on a printed circuit board by an ink jet method. However, if the code mark for identification is printed on the printed circuit board at the time of manufacturing the printed circuit board, the identification is performed. The code mark for is the serial number of the printed circuit board, but it is extremely difficult to control the process of each line of the mounting process for each printed circuit board by this serial number. Therefore, in order to perform process control of each line of the mounting process by the identification code mark printed on the printed circuit board, the printing of the identification code mark on the printed circuit board is supplied to each line for each mounting line. The printed circuit board to be printed must be determined and put in place before it can be carried out. Therefore, this printing is performed directly before the mounting line for each mounting line. However, at this stage, the printed circuit board has already been coated with various fluxes necessary for the mounting process. The solvent of this flux has a function of causing ink to be bleeded when a code mark is printed on a printed circuit board in a non-contact manner by an inkjet method.

As a measure against this, in the code mark printing apparatus of the present invention, the heating means heats the code mark printing position of the printed circuit board before the code mark printing,
The solvent of the flux is evaporated to prevent the printing ink from bleeding.

In the code mark printing apparatus of the present invention, the printing means prints the code mark on the heated code mark printing position in a non-contact manner by the ink jet method. Solvent has already evaporated, and since the solvent of the ink printed by the inkjet method is also easily evaporated, the printing ink does not bleed and the thickness of the printing ink for the code mark is about 2 to 3 μm. When screen-printing the cream solder, the cream solder does not exude from the gap between the printed circuit board and the screen. Then, according to the inkjet method, by controlling the operation of the nozzle of the jet, it is possible to print a code mark suitable for process control, such as a serial number for control, on the printed circuit board to be printed. Also, the cost is about 1 yen / sheet,
The cost will be lower.

If the code mark inspecting means is arranged in the code mark printing apparatus of the present invention to inspect the printed code mark, highly reliable code mark printing can be performed. It is suitable.

Further, the code mark printing apparatus of the present invention carries out the printed board carry-in means, the positioning means for positioning the code mark print position of the carried-in printed board, and the printed board on which the code mark is printed. By adding the carrying-out means, the printed circuit board directly connected to the printed circuit board mounting apparatus and having the identification code mark printed thereon can be supplied to the printed circuit board mounting apparatus.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration and operation of one embodiment of the code mark printing apparatus of the present invention will be described with reference to FIG.

In FIG. 1, the printed circuit board 1 to which the soldering flux has been applied in the previous step is placed on the belt 8, guided by the rails 7, carried in the direction of the arrow 10, and previously indicated by the arrow 11. The code mark printing position is positioned by being restricted by the positioning means 9 which is rising in the rising direction. The uniaxial reciprocating means 6 previously moved to the left of the arrow 12 in FIG. 1 moves to the right of the arrow 12, and the heating means 5 attached to the uniaxial reciprocating means 6 is attached.
However, the printed position of the code mark in the ear portion of the printed circuit board 1 which has been positioned is 150 ° C. to 30 ° C. without contact.
Heat to 0 ° C. By this heating, the solvent of the flux applied to the code mark printing position is evaporated and the solvent of the ink to be printed later is easily evaporated, so that the printed ink does not bleed.

When this heating is completed, the printing means 3 attached to the uniaxial reciprocating means 6 prints the code mark 2 on the code mark printing position of the printed board 1 in a non-contact manner by the ink jet method. The printing ink used in this case may be any ink as long as it can be used in the inkjet system. As described above, the printed printing ink is heated to evaporate the flux solvent,
Moreover, since the temperature is as high as 150 ° C. to 300 ° C., the solvent of the printing ink evaporates immediately and the printing does not bleed. Then, by controlling the operation of the nozzles of the inkjet type jet, the data necessary for process control is printed on the printed circuit board to be printed, including code marks suitable for process control, such as serial numbers for control. To do.

When the printing is completed, the code mark inspection means 4 attached to the uniaxial reciprocating means 6 inspects the printed code mark 2.

When the inspection is completed, the positioning means 9 moves in the descending direction of the arrow 11, and the belt 8 carries out the printed board 1 in which the inspection of the code mark is completed in the direction of the arrow 10.

The code mark printing apparatus of the present invention is not limited to the above-mentioned embodiment, but various modes are possible. For example, the design of the positioning mechanism for the printed board 1, the heating means 5, the printing means 3, and the code mark inspection means 4 is not limited to the mechanism of the embodiment, and can be freely designed.

As the heating means 5, any means can be used as long as it can be heated without contact. The heating temperature is also 150
The temperature is not limited to ° C to 300 ° C, and may be any temperature at which the printed circuit board 1 can withstand the evaporation of the flux solvent. The heating time may be any time as long as the printed circuit board 1 can withstand the evaporation of the flux solvent.

[0022]

According to the code mark printing apparatus of the present invention, the code mark printing position is heated by the heating means to evaporate the solvent of the flux applied to the printed circuit board and to easily evaporate the solvent of the printing ink. The effect that the code mark can be printed without bleeding the ink is obtained.

Further, since the print thickness of the code mark is thin,
This has the effect of preventing the cream solder from seeping out when screen-printing the cream solder.

Further, there is an effect that the cost can be significantly reduced as compared with the pasting of the code mark / label in the conventional example.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a code mark printing device of the present invention.

FIG. 2 is an operation diagram of a conventional code mark providing method.

[Explanation of symbols]

 1 Printed Circuit Board 2 Code Mark 3 Printing Means 4 Code Mark Inspecting Means 5 Heating Means 6 Unidirectional Reciprocating Means 7 Rails (Loading / Unloading Means) 8 Belts (Loading / Unloading Means) 9 Positioning Means

Claims (2)

[Claims] 1. A code mark printing apparatus for printing a code mark for identification on a printed circuit board, a heating means for heating a code mark printing position of the printed circuit board before the code mark is printed, and an ink jet at the heated code mark printing position. A code mark printing apparatus comprising a printing unit for printing a code mark in a non-contact manner according to a method. 2. The printed circuit board carry-in means, the positioning means for positioning the code mark printing position of the carried-in printed circuit board, and the carry-out means for carrying out the printed circuit board having the code mark printed thereon. Code mark printing device.