JPS6251456A - Laser marking device - Google Patents

Abstract

PURPOSE:To provide a correct and clear image of a symbol field by marking a work using a laser reflected from the surface of a reflection mask. CONSTITUTION:A total reflection mirror 3 is arranged inclined at 45 degrees on the optical axis of a laser 2 emitted from a laser oscillator 1. In addition, a reflection mask 5 is arranged inclined at about 45 degrees at a prearranged distance from the total reflection mirror 3 on the optical axis of a laser 4 set at a right angle with a laser 2. On the optical axis of a laser 6 reflected by the reflection mask 5, a lens 7 and a work 8 are sequentially arranged at a prearranged distance from the reflection mask 5. Next, the reflection mask 5 is composed of a symbol field 9 containing characters which reflect the laser 4 and a mask substrate 10 which allow irregular reflection or permeation of a laser. Thus the use of the reflection mask 5 enables symbols such as characters to be marked extremely accurately.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to improvements in laser marking devices.

[Background technology and its problems]

Conventionally, a laser marking device is configured as shown in FIG. 4, and includes a laser oscillator 1, a total reflection mirror 3, a mask 11,
A lens 7 and a workpiece 8 are sequentially arranged at a predetermined interval. During operation, Y emitted from the laser oscillator 1
Laser light 2 such as AG laser light or CO2 laser light is
It is reflected and transmitted by a total reflection mirror 3 and becomes a laser beam 4,
It passes through a thin mask 11 in which letters and the like are hollowed out. The image of the hollowed-out characters is then formed on the workpiece 8 by the lens 7, and the hollowed-out characters are marked on the mask 11.

By the way, in the conventional laser marking apparatus as described above, the mask 11 is made up of a mask substrate 13 and a letter, for example, k12, cut out in the mask substrate 13, as shown in FIG. 5, for example. An image is marked onto the workpiece 8. However, due to the character 112 being hollowed out on the mask substrate 13, the character A12 has a missing part 14.15, and the laser beam 4 is not transmitted through this missing part 14°15 but is reflected, so that the character cannot be accurately written. It is not.

In addition, as another example of the mask 11, as shown in FIG. 6, the letters AJ5 are made of glass so that the laser beam 4 passes through, and the mask substrate 12 other than the letters 116 is made of glass so that the laser beam 4 is reflected. There is a type of glass with a vapor-deposited film applied to it. However, in this example, a YAG laser beam can be used as the laser beam 2, but a CO□ laser beam cannot be used.

[Purpose of the invention]

An object of the present invention is to provide a laser marking device in which images of symbols such as characters marked on a workpiece are extremely accurate and clear, and reliability is significantly improved.

[Summary of the Invention] The present invention provides a laser marking device that reflects and transmits a laser beam emitted from a laser oscillator by a total reflection mirror, and further marks a workpiece through a mask.
The mask is characterized in that a reflective mask is used, and the laser beam reflected on the surface of the reflective mask is used to mark the workpiece. This laser marking device consists of a symbol portion and a mask substrate other than the character portion that diffusely reflects or transmits laser light.

[Embodiments of the invention]

The laser marking device of the present invention is constructed as shown in FIG. 1, and the same parts as in the conventional example (FIG. 4) are given the same reference numerals.

That is, on the optical axis of a laser beam 2 such as a YAG laser beam or a C02 laser beam emitted from a laser oscillator 1, a total reflection mirror 3 is disposed at an angle of 45 degrees with respect to the optical axis. Further, on the optical axis of the laser beam 4 perpendicular to the optical axis of the laser beam 2, a reflective mask 5 is arranged at a predetermined distance from the total reflection mirror 3 and inclined at an angle of about 45 degrees with respect to the optical axis of the laser beam 4. It is arranged as follows. On the optical axis of the laser beam 6 reflected by the reflective mask 5, a lens 7 and a workpiece 8 are sequentially arranged at a predetermined distance from the reflective mask 5.

However, in this case, the workpiece 8 is arranged substantially parallel to the reflective mask 5. Optimally, the dimensions of each part shown in FIG. 2 should be arranged so as to satisfy the following formula.

Next, the reflective mask 5, which is a feature of the present invention, is constructed as shown in FIG.
It consists of a mask substrate 10 other than the above. - For example, the mask substrate 10 is made of Cu and has a rough surface so as to reflect diffusely, and the symbol portion 9 is made of Cu and has a mirror surface 5 to reflect laser light.

In this case, the types of laser light that can be used are YAG and C
Both O2 are possible. Other specific examples of the combination of the symbol part 9 of the reflective mask 5 and the material and shape of the mask substrate 10, as well as the relationship with the types of laser beams that can be used, are as shown in Table 1. Become. In Table 1, ■ is □ in the above example.

Table 1 During operation, a laser beam 2 emitted from a laser oscillator 1 is reflected and transmitted by a total reflection mirror 3 to become a laser beam 4, and this laser beam 4 irradiates a reflective mask 5. Laser light 6 reflected by this reflective mask 5
is focused by the lens e7, and is imaged on the workpiece 8,
An image of a symbol such as a character drawn on the reflective mask 5 is marked.

〔Effect of the invention〕

According to this invention, since the reflective mask 5 is used as the mask, symbols such as characters can be marked on the workpiece 8 with great accuracy. In addition, the above conventional example (
In FIG. 6), CO2 laser light could not be used as the laser light, but in this invention, both YAG laser light and CO2 laser light can be used.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a laser marking device according to an embodiment of the present invention, FIG. 2 is a configuration diagram showing the dimensional relationship of main parts in the laser marking device of the present invention, and FIG.
The figure is a perspective view showing a reflective mask used in the present invention, and FIG. 4 is a schematic configuration diagram showing a conventional laser marking device.
FIGS. 5 and 6 are plan views showing two examples of masks used in conventional laser marking devices. DESCRIPTION OF SYMBOLS 1... Laser oscillator, 2... Laser light, 3... Total reflection mirror, 4... Laser light, 6... Reflective mask, 6... Laser light, 7... Lens, 8... Workpiece, 9... Symbol part, 10... Mask substrate. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1-2 Figure 3 Figure 4 b Figure 5 Figure 6

Claims (3)

[Claims] (1) In a laser marking device that reflects and transmits laser light emitted from a laser oscillator by a total reflection mirror and then marks the workpiece through a mask, a reflective mask is used as the mask, and the reflective mask is used as the mask. A laser marking device characterized in that the workpiece is marked with a laser beam reflected on the surface of the workpiece. (2) The laser marking device according to claim 1, wherein the reflective mask comprises a character portion that reflects laser light and a mask substrate other than the character portion that diffusely reflects or transmits laser light. (3) The laser marking device according to claim 1 or 2, wherein the reflective mask and the workpiece are arranged substantially parallel to each other.