JPS62203692A - Laser marking method - Google Patents

Abstract

PURPOSE:To make a mark multi-colored and clarified by forming the coating layer having various colors on the surface of a base metal in plural layers, then by removing upto the necessary color layer by projecting laser light. CONSTITUTION:The 1st-4th paints 2, 3, 4, 5 having various colors are coated in layers in order on a base metal 1 respectively. Then, laser light is projected on the necessary pattern part, the laser energy is controlled as well and upto the layers of paint in the necessary depth are respectively removed. In this way, a multicolor mark can be formed by changing an exposing layer. Moreover, the mark having good contrast is formed due to the majority of the laser light being absorbed in the paint. Consequently the multi-coloring and clarification of the mark are enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a laser marking method, and in particular to a method for forming color marks that can be used on name plates with multicolored characters.

[Conventional technology]

Conventional laser marking methods involve irradiating and heating only the required portions of the substrate surface to cause deterioration or removal, or coating the substrate surface as described in JP-A No. 60-204392. The mark was formed by irradiating the coated film with a laser beam to remove only the coat, and creating a contrast between the part of the base material irradiated with the laser light and other parts.

[Problem that the invention seeks to solve]

Among the conventional marking methods mentioned above, in which the substrate is directly irradiated with a laser beam, the color of the area irradiated with the laser beam turns brown, so there is a difference between the area of the substrate irradiated with the laser beam and other areas. There was a problem that the contrast between the marks was so low that it was difficult to recognize them as marks. In addition, the method of removing the film by irradiating the film coated on the surface of the base material with laser light improves the contrast and produces marks that are relatively easy to recognize, but there is the problem that multicolored marks cannot be obtained. was there.

This invention was made in view of the problems mentioned above.
It is an object of the present invention to provide a laser marking method that can make the mark part in various colors so that it is easily recognized and can form a high-quality mark.

[Means for solving problems]

The laser marking method according to the present invention includes the steps of first applying several layers of paint of different colors onto a base material, and then irradiating the coated paint layers of the base material with a laser beam to form a desired pattern up to the desired layer. It consists of a step of removing.

[Effect]

In this invention, since several layers of paint are applied on the base material, even if not only an appropriate amount of laser energy but also an excessive amount of laser energy is applied, most of the laser light will be absorbed by the paint, causing damage to the base material. The pattern becomes clearer. Furthermore, by controlling the laser energy, it is possible to remove up to the desired paint layer, making multicolor marking possible.

〔Example〕

@1 Figure is a cross-sectional view 1 showing a state in which a base material is marked by a laser marking method according to an embodiment of the present invention.
, 82 is a sectional view showing a base material used in the same laser marking method, and FIG. 6 is a perspective view showing a base material subjected to shimmer marking by the same laser marking method.

In the figure, (1) is the base material, (2) is the first paint, and (3)
is the second paint, (4) is the fifth paint, and (5) is the fourth paint, and these first to fourth paints (3), (4), and (5) have different colors. (6) is a laser beam, (
2a) is the exposed part of the first paint (2), (3a) is the exposed part of the second paint (3), and (4a) is the exposed part of the sixth paint (4).
) is the exposed part.

Next, the laser marking method of this embodiment will be explained.

First, as shown in FIG. 2, a first paint (2) is applied to the surface of a base material (1). After that, $2f4 fee (3), 3rd
Paint (4), 4th paint (5)? : Apply sequentially to the base material (
1) Form multiple coating layers of various colors on the surface.

Next, as shown in FIG. 1, a laser beam (6) is irradiated onto a desired pattern portion. At that time, the laser energy is controlled to remove the paint layer to a desired depth, and by changing the exposed paint layer, a multicolored mark is formed. Third
The figure shows an example of the mark, where the first paint (2) is applied on the same base material (1).
) is exposed (2a), the second paint (3) is exposed (3m), the fifth paint (4) is exposed (4a)
The mark is a six-color pattern. Also, at this time,
Even if excessive laser energy is input, the first to fourth
Paint (2), (3), (4).

Since most of the laser energy is absorbed in (5),
The pattern becomes clear without damaging the base material (1).

〔Effect of the invention〕

As explained above, this invention is based on coating several layers of paint on a base material so that not only an appropriate amount of laser energy but also a large amount of laser energy is absorbed by the paint so that most of the laser light is absorbed.
As a result, markings with good contrast can be formed without thermally affecting the substrate, and since the laser energy can be controlled to remove up to the desired paint layer, the desired butter/multicolor markings can be formed. It has the effect of being

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a state in which a υ base material is marked by a laser marking method according to an embodiment of the present invention;
FIG. 2 is a sectional view showing a base material used in the same laser marking method, and FIG. 6 is a perspective view showing a base material marked by the same laser marking method. In the figure, (1) is the base material, (2) is the first paint, and (3)
is the second paint, (4) is the third paint, (5) is the fourth paint, (
6) is a laser beam. In each figure, the same reference numerals indicate the same or equivalent parts.O Agent Patent Attorney Masaru Sato

Claims (1)

[Claims] A laser marking method comprising forming a plurality of coating layers of various colors on the surface of a base material and irradiating the coating layers with laser light to remove even the coating layers of a desired color in a desired pattern.