JPS6245496A - Reflection type mask for laser - Google Patents

Abstract

PURPOSE:To execute marking without line disconnection by providing a reflection surface having the shape of a character or figure on one surface of a substrate having laser light transmittability and covering the inside and circumference thereof with a light scattering surface or antireflection surface. CONSTITUTION:A reflection type mask 5 has the reflection surface 1 formed by subjected one surface of the substrate 4 having the laser light transmittability to reflection coating having the shape of the character or figure and the light scattering surfaces or the antireflection surfaces 2, 3 subjected to antireflection coating. The pulse laser light emitted from a TEA-CO2 laser light source 6 is reflected only in the part of the marking pattern by the mask 5 and is imaged to the surface 8 to be worked by a condenser lens 7. The marking without the line disconnection is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for quickly and effectively marking characters, numbers, trademarks, etc.
This invention relates to a laser marker mask using a Co2 laser.

2. Description of the Related Art A mask used in a conventional TEA Cot laser marker has a substrate 14 with characters, as shown in FIG. 2(a).
Transmissive aperture 11 and reflective surface 12 in the shape of numbers, trademarks, etc.
and 13. And this mask 15
is used as a part of a laser marker as shown in FIG. 2(b). A pulsed laser beam emitted from a TEA Co laser light source 6 is reflected by a reflecting mirror 17 and irradiates this transmission type mask 15 . The light passing through the transmission aperture 11 is
An image is formed on the surface to be processed 8 by the condensing lens 7 . The light irradiated onto areas other than the transmission aperture is reflected by the reflection surface 12 or 13, and the shape of the transmission aperture 11 is marked on the surface 8 to be processed.

Problems to be Solved by the Invention In the conventional TEA CO and laser marker masks described above, the transmission aperture and the reflection surface are made of a metal plate such as Al, and the shape of the transmission aperture 11 is a letter or a number. In cases such as A, if the internal reflective surface 13 is completely cut out, it will fall off, so a connecting portion 16 must be provided between the internal reflective surface 13 and the external reflective surface 12. When the connecting portion 16 is provided, the characters marked on the surface to be processed 8 will have line breakage, which will degrade the quality.

Means for Solving the Problems The laser reflective mask of the present invention includes a reflective surface coated with a reflective coating in the shape of letters or numbers on a substrate that is transparent to laser light. Its interior and surroundings are covered with a light-scattering surface or an anti-reflection surface with an anti-reflection coating.

Function: The laser reflective mask according to the present invention can cut lines by irradiating it with laser light and processing it using the reflected light.
It becomes possible to make markings without markings.

Example Next, the present invention will be explained with reference to the drawings.

FIG. 1(a) is a perspective view of an embodiment of the present invention. A laser reflective mask 5 according to the present invention has a reflective surface 1 coated with an optical thin film on one side of a substrate 4 made of a transparent material such as Si or Ge, and a reflective surface 1 coated with a light scattering surface or an optical thin film. Anti-reflective surfaces 2 and 3 are provided with anti-reflective coatings. The reflective surfaces 1 are shaped like letters or numbers, and two of the antireflection surfaces are external antireflection surfaces and three are internal antireflection surfaces. A coupling portion (corresponding to 16 in FIG. 2(a)) connecting the outer antireflection surface 2 and the inner antireflection surface 3 is unnecessary. Therefore, line breaks in characters do not occur.

An example of the use of this laser reflective mask is shown in FIG. 1(b). The pulsed laser beam emitted from the TEACO laser light source 6 is reflected by the reflective mask 5 according to the present invention at a portion of the marking pattern λ, and is imaged onto the workpiece surface 8 by the condenser lens 7, resulting in marking without line breakage. will be held.

The above is a case using TEA Co and a laser, but if the material of the substrate 4 of the reflective mask 5 is glass, it can also be applied to a YAG laser or the like.

Effects of the Invention As explained above, according to the present invention, a reflective surface in the shape of letters or the like is provided on one side of the substrate, and a light scattering surface or an antireflection surface is provided inside and around the reflective surface. It is possible to mark round characters such as O without line breakage, and has the effect of improving the quality of the marking pattern.

[Brief explanation of the drawing]

Fig. 1(a) is a perspective view of an embodiment of the present invention, Fig. 1fb)
is a configuration diagram of a laser marker using this, Figure 2 (a) is a perspective view of a conventional laser marker mask, Figure 2 (fb)
is a configuration diagram of a laser marker using this. 1... Reflective surface, 2... External reflection prevention (
3...Internal reflection prevention (or light scattering) surface, 4...Substrate, 5...Reflective mask for laser, 6... ...Laser light source, 7.
... Condensing lens, 8... Surface to be processed. -Kasha (d) 壬 1 Figure

Claims (1)

[Claims] A reflective surface coated with a reflective coating having the shape of letters, numbers, etc. to be marked on one side of the board;
1. A reflective laser mask characterized by comprising a light-scattering surface or an anti-reflection surface coated with an anti-reflection coating inside and around the mask.