JPH07156528A - Marking method for electronic part - Google Patents

Abstract

PURPOSE:To prevent ink from being squeezed out of a part to be subjected to a predetermined marking without cooling rollers and a dampener-less lithographic plate to correctly make a marking on a predetermined position of an electronic part. CONSTITUTION:In a marking method for an electronic part 5 for marking information, such as characters or symbols, on a predetermined position of the electronic part 5 by transferring ink 3 using a dampener-less lithographic plate 14 and a transfer pad 15, the ink 3 in use has a viscosity of approximately 65,000cp or more at the time of marking on the electronic part 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marking method for electronic parts, and more particularly to a marking method for displaying information such as characters and symbols on electronic parts using a waterless planographic printing plate and a transfer pad.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As a marking method for displaying information such as characters and symbols on electronic parts, as shown in FIG.
After the ink 3 is attached to a predetermined position of the roll-shaped waterless planographic plate 2 and the ink 3 is transferred from the roll-shaped waterless planographic plate 2 to the transfer roller 4, the ink 3 is transferred to the predetermined position of the electronic component 5. There is a marking method for transferring.

As another marking method, as shown in FIG. 1, after the ink 3 is attached to the reciprocating roller 13 from the inking roller 11 via the roller 12, the reciprocating roller 1 is used.
3 to move the flat plate-shaped recess 14 of the waterless planographic plate 14
There is a marking method in which the ink 3 is attached to a, the ink 3 is transferred from the waterless planographic plate 14 to the transfer pad 15, and then the ink 3 is attached to a predetermined position of the electronic component 5.

In this marking method, the rolling heat of each roller such as the inking roller 11 and the waterless planographic printing plate 14 are used.
Since frictional heat is generated between the upper part and the reciprocating roller 13 which reciprocates on the upper part, the temperature rise range of the ink 3 becomes larger than that in the case of the marking method using the roll-shaped waterless planographic plate, and the ink is accordingly increased. The decrease rate of the viscosity of 3 becomes large.

As a result, the ink 3 is not sufficiently repelled on the surface of the waterless planographic plate 14 made of, for example, silicone rubber, and the ink 3 squeezes out to a place other than the concave portion 14a to which the ink 3 should adhere, and a predetermined amount of the electronic component 5 is provided. There is a problem that accurate marking cannot be performed on the position.

Further, the ink 3 transferred to the electronic component 5
However, if it sticks to an end surface electrode (not shown) or the like outside the portion where a predetermined display is to be made, there is a problem in that the electrical characteristics of the electronic component, which is a product, will be defective.

In order to solve such a problem, a method of wiping off the ink adhering to a portion other than the concave portion 14a of the waterless planographic plate 14 can be considered. In this method, the plate surface of the waterless planographic plate 14 is damaged. However, there is a problem of shortening the life. Further, the scratched portion of the plate surface becomes an image portion, and ink is printed in that pattern, so that there is a problem that a display defect occurs and the quality deteriorates.

As a method for solving the above problems, a method of sending cooling water or air to a roller or a waterless planographic plate to prevent the temperature of the ink from rising can be considered, but the process is complicated. Therefore, there is a problem that the cost is increased.

The present invention solves the above-mentioned problems and prevents the ink from protruding from a portion where a predetermined display is to be made, without cooling the roller or the waterless planographic printing plate. An object of the present invention is to provide a method for marking an electronic component that enables accurate marking on a predetermined position of the component.

[0010]

In order to achieve the above object, the method for marking an electronic component according to the present invention comprises transferring ink by using a waterless planographic printing plate and a transfer pad.
A marking method for displaying information such as characters and symbols at a predetermined position of an electronic component is characterized in that an ink having a viscosity of about 65,000 cp or more is used when marking the electronic component.

[0011]

In the marking process, the temperature of the ink is usually higher than room temperature due to the rolling heat of the roller and the friction heat between the roller and the waterless planographic plate. However, according to the marking method of the present invention, when marking electronic components, about 6
Since a high-viscosity ink having a viscosity of 5000 cp or more is used, even if the temperature of the ink rises due to the rolling heat of the roller or the frictional heat between the roller and the waterless planographic plate, it is not affected by it. It is possible to accurately mark a predetermined position on the part.

[0012]

EXAMPLES Examples of the present invention will be shown below to describe the features of the present invention in more detail.

FIG. 1 is a view showing an apparatus used for marking in this embodiment. This marking device is a flat plate-shaped waterless planographic plate 14 on which a thickening roller 11, a roller 12 facing the thickening roller 11, and a concave portion 14a having a predetermined pattern corresponding to characters or symbols to be displayed are formed. The reciprocating roller 13 reciprocates to attach the ink 3 to the recess 14a of the waterless planographic plate 14, and the ink 3 in the recess 14a of the waterless planographic plate 14 is adhered (transferred) and then pressed against the electronic component 5 A transfer pad 15 for attaching the ink 3 is provided at a predetermined position of the component 5.

In this embodiment, the ink 3
As for the epoxy-based UV curable ink, the viscosity at the time of marking (transferring) on the electronic component 5, that is, the viscosity at a temperature higher than room temperature due to rolling heat or frictional heat of each roller is about 65000 cp or more. .

Next, a process of marking an electronic component using this marking device will be described.

First, ink is attached from the inking roller 11 to the reciprocating roller 13 via the roller 12. then,
Move the reciprocating roller 13 to move the reciprocating roller 13 into a flat plate without water
The ink 3 is attached to the concave portion 14 a of No. 4.

Next, the transfer pad 1 is transferred from the waterless planographic printing plate 14.
After the ink 3 is transferred to 5, the transfer pad 15 is horizontally moved to a predetermined position, and then the transfer pad 15 is lowered and pressed against the electronic component 5, so that the ink 3 is attached to the predetermined position. Then, by repeating the above operation, the electronic component is continuously marked.

According to the experiment, as shown in FIG.
The temperature of the ink rises due to rolling heat and frictional heat of each roller and becomes almost constant at a temperature of about 35 ° C., which is 8 to 10 ° C. higher than that at room temperature, and the ink viscosity reverses with this temperature rise. It has been confirmed that the ink has a low viscosity, and that when the viscosity of the ink is lower than 65000 cp, the print stain starts to occur. Therefore, in this example, an ink that maintains a viscosity of 65,000 cp or higher at around 35 ° C. is selected.

As described above, in the marking method of the above-mentioned embodiment, about 6500 marks are applied when the electronic component 5 is marked.
Since the high-viscosity ink 3 having a viscosity of 0 cp or more is used, the temperature of the ink 3 rises due to rolling heat of each roller such as the inking roller 11 or frictional heat between the reciprocating roller 13 and the waterless planographic plate 14. Even in such a case, it is possible to perform accurate marking on a predetermined position of the electronic component 5 without being affected by the influence.

Therefore, it is not necessary to prevent the temperature rise of the ink by cooling each roller or the waterless planographic plate, and the cost increase due to the complicated process can be prevented.

In the above embodiment, the case where the epoxy UV curable ink is used has been described, but the kind of ink is not limited to this, and other kinds of ink used for displaying information of electronic parts can be used. It is also possible to use ink.

The marking device to which the marking method of the present invention can be applied is not limited to the marking device shown in the above embodiment, and various marking devices provided with a waterless planographic printing plate and a transfer pad. When the marking is performed by using, the marking method of the present invention can be widely applied.

The present invention is not limited to the above embodiments in other points as well, and various applications and modifications can be made within the scope of the gist of the invention.

[0024]

As described above, the method of marking an electronic component according to the present invention has about 650 when the electronic component is marked.
Since the ink having the viscosity of 00 cp or more is used, even if the temperature of the ink rises due to the rolling heat or frictional heat of the roller, the ink is not affected by the influence, and the ink can be accurately positioned at a predetermined position of the electronic component. Marking can be done.

Further, since it is possible to prevent the ink from adhering to the end surface electrodes of the electronic component, it is possible to eliminate the defective electrical characteristics of the product.

Further, since the ink does not adhere to the portions other than the concave portions of the waterless planographic plate and it is not necessary to wipe off the ink that has overflowed to the portions other than the concave portions, the plate surface of the waterless planographic plate is not damaged. The life can be extended.

Furthermore, since the plate surface is not damaged by wiping off the ink, the damaged portion of the plate surface serves as an image area, and it is possible to prevent the occurrence of display defects due to the ink being printed in the pattern.

[Brief description of drawings]

FIG. 1 is a diagram showing an apparatus used to carry out a method for marking an electronic component of the present invention.

FIG. 2 is a diagram showing the behavior of ink temperature and viscosity in the marking process.

FIG. 3 is a diagram illustrating an example of a conventional electronic component marking method.

[Explanation of symbols]

 3 Ink 5 Electronic Parts 11 Ink Roller 12 Roller Opposing Ink Roller 13 Reciprocating Roller 14 Waterless Planographic Plate 14a Waterless Flat Plate Recess 15 Transfer Pad

Claims (1)

[Claims] 1. A marking method for displaying information such as characters and symbols at a predetermined position of an electronic component by transferring ink using a waterless planographic printing plate and a transfer pad. A method for marking an electronic component, which comprises using an ink having a viscosity of 65000 cp or more.