JPS6347640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engraving method using a laser, and more specifically, it is an engraving method that attempts to form countless needle-like small protrusions in recesses that have conventionally all disappeared or been deleted.

When using a carbon dioxide laser beam to engrave a pattern cut out on the metal mask plate by overlapping a metal mask plate etc. on the surface of the engraving material and scanning the laser beam from above the metal mask plate, all the cut out parts are It was carved into a deep concave shape. Therefore, the masked part that is not engraved with the laser beam and the part that is engraved with the laser beam are simply expressed as unevenness of the same depth. For this reason, it cannot be denied that the resulting engravings inevitably give a dull feel, and even if the depth of the recess is changed by changing the output of the laser beam, for example, the change in image will be minimal. can be,
Furthermore, in that case, the operation would be complicated, and no significant changes in design could be expected compared to conventional methods.

Therefore, the present invention provides an engraving method that can form countless needle-like small protrusions on the engraving surface of the cutout part of the mask board, that is, the part that has been carved to a certain depth until now, and provides a warm engraving method. The purpose is to obtain a sculpture that not only gives an image but also has improved design and commercial value.

To give an overview of the method of the present invention, until now engraving was performed by scanning a laser beam from above the mask plate without any gaps (or overlapping), but in the present invention, the laser beams are scanned at certain intervals. The first scan is performed in parallel with the same distance as the first scan, and the second scan is performed in such a way that the scanning direction intersects the first scan direction at a certain angle. It scans and engraves.

The present invention relates to a method for engraving a desired pattern on a wood board, etc. by controlling a laser beam using a mask plate, etc. The present invention relates to a method for engraving a desired pattern on a wood board, etc. by controlling a laser beam using a mask plate, etc. After scanning in parallel with a certain interval (for example, about 0.5 to 1.5 times the convergence width or more), the laser beam is scanned in parallel with at least the same interval as above by making the scanning direction intersect with the previous scanning direction. This is a laser engraving method that is characterized by scanning the surface and engraving a non-mask surface such as wood into countless small protrusions.

The invention will now be further explained with reference to the drawings. As shown in FIG. 1, a metal mask board 2 on which a pattern 4 is provided by hollowing out is closely attached to a carving material 1 such as a wood board. The metal mask plate 2 may be a conventionally used brass plate or the like with a cut-out pattern etched thereon, or chrome plating or the like to improve its durability against laser beams. Next, a laser beam is irradiated from above the metal mask plate 2. At this time, as shown by the arrows in FIG. 2, the first scanning is performed in parallel with a distance between the spots of the laser beam on the surface of the engraving material so that they do not overlap. That is, a laser beam is irradiated and the laser beams are scanned at intervals so that the erased engraved grooves are lined up in parallel with the non-engraved portion sandwiched between them. After the laser beam is scanned in this manner, as shown in FIG. 3, it becomes as if a parallel line was drawn just at the cutout part of the mask plate. Next, change the scanning direction of the laser beam to 1 as shown by the arrow in Figure 3.
Change the scanning direction so that it is perpendicular to the first scanning direction, and change the scanning width to two in parallel with a certain interval as in the first scanning.
This is the second scan. As a result of this second scanning, the removed portions of the mask plate are divided into squares by engraving grooves of the laser beam. As described above, the surface of the engraving material exposed from the hollowed out part of the mask plate by the first and second laser beam scanning has many needle-shaped small protrusions 3 arranged vertically and horizontally as shown in Fig. 4. It is formed. The height of the small needle-like protrusions 3 can be arbitrarily changed by changing the scanning interval of the laser beam as shown in FIG. 6. For example, as shown in FIG. If the V-shaped engraving grooves 5 overlap below the surface of the engraving material, needle-like small protrusions 3 will be formed.
In addition, as shown in FIG. 6B, if the scanning interval is relatively wide so that the V-shaped engraving grooves 5 of the laser beam do not overlap below the surface of the engraving material, the maximum It is possible to obtain the same height as the non-engraved part. Moreover, if the scanning interval of the laser beams is made narrower than that of FIG. 6A so that they almost overlap, it is possible to completely eliminate small protrusions as in the conventional case. Note that when the interval is widened, the reproduction of the image becomes rougher in proportion to the width, so it is necessary to take the scanning interval into consideration depending on the image to be engraved. It goes without saying that the spacing between the small needle-like protrusions 3 can also be changed arbitrarily depending on the laser beam scanning interval.

Therefore, if the scanning interval of the laser beam is set so that the height of the small needle-like protrusions to be formed is lower than the initial height of the surface of the engraving material, a large number of needles will be created as shown in Figure 5. It is possible to obtain a sculpture in which a pattern appears to be floating inside the small protrusions.
At this time, since the laser beam irradiation part becomes high temperature, the small protrusion is burnt to a large extent around the circumference, and becomes a rounded needle-like small protrusion 3. Also, if we talk about the angle at which the scanning direction changes between the first and second laser beam scans, the intersection angle is not limited to the right angle, but also the scanning interval (related to the roughness of the pattern expression), the interval of the needle-like protrusions, and the shape. , size (related to the expression of parts other than the pattern and the appearance of the pattern), etc., should be taken into consideration when selecting, but usually the intersection angle is fixed at a right angle and only the scanning interval is changed. Therefore, various expressions are possible.

The metal mask plate 2 is removed from one side of the engraving material that has been engraved in this way, the one side of the engraving material is washed with sodium hypochlorite, etc., and the slag is removed to complete the engraving.

The engraved product obtained by the method of the present invention has a pattern 4 floating on a large number of needle-like small protrusions 3, and has surface reflection characteristics of the non-engraved part and the engraved part with small protrusions. This difference gives a feeling as if the design is floating on top of the jutan, giving the sculpture a warm feel not seen in conventional sculptures.

In addition, engraved items with the tip of the small protrusion formed at the same height as the non-engraved surface can be used to stably place a cup, glass, or other ornament between the non-engraved surface and the engraved surface. It is.

[Brief explanation of drawings]

The drawings are explanatory diagrams showing the present invention, and FIGS. 1 to 4 are schematic explanatory diagrams thereof, FIG. 5 is a cross-sectional view of the carved product, and FIG. 6 is a cross-sectional diagram showing the relationship between the scanning interval and the small protrusions. It is a diagram. 1... Carving material, 2... Metal mask plate, 3...
Needle-like small protrusions, 4, 4'...design, 5...laser beam V-shaped engraving groove.

Claims (1)

[Claims] 1 Regarding a method of engraving a desired pattern on a wood board, etc. by controlling a laser beam using a mask plate, etc., the laser beam is applied to the engraving surface at a certain interval that approximates the beam convergence width on the irradiation surface or is slightly wider than the convergence width. After scanning in parallel, the laser beam is scanned in parallel with at least a certain interval similar to the above, with the scanning direction intersecting the previous scanning direction, and the non-mask surface such as wood is covered with countless small protrusions. A laser engraving method characterized by engraving.