JPS60182792A - Mark forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a mark forming device that obtains a rectangular pattern such as a bar code by irradiating a workpiece with a laser beam or the like, and in particular a mark forming apparatus that has a rectangular slit between the workpiece and a light source. The present invention relates to a mark forming apparatus that forms a rectangular pattern on the surface of a workpiece by arranging a mask having a mask and a cylindrical lens, and effectively utilizes energy from a light source.

(b) Prior Art and Problems Conventionally, when forming a mark on a printed board or the like for identification, conventional mark forming devices of this type form a circular mark by irradiating a beam directly onto the printed board from a laser light source. was. As means for arbitrarily changing the diameter of the mark, the distance Filt between the light source and the workpiece has been changed, or a mask having a circular slit in the middle has been arranged.

However, if the mark has a circular shape as described above, it is difficult to read the mark by a machine because the area of the mark changes as the mark moves during scanning. Furthermore, only a portion of the energy of the laser beam can be used by the mask used to control the mark size, making it impossible to utilize the energy effectively. Therefore, a high output laser oscillator was required.

(c) Purpose of the Invention The present invention has been made in view of the above circumstances, and is a method in which a mask having a rectangular slit and a cylindrical lens are arranged between the workpiece and the light source to form a rectangular pattern on the surface of the workpiece. An object of the present invention is to provide a mark forming device that effectively utilizes energy from a light source.

(d) Structure of the Invention and the above-mentioned object is, according to the present invention, a mark forming device that forms a mark on the surface of a workpiece by irradiating energy from a light source, which has a rectangular slit between the light source and the workpiece. This is achieved by providing a mark forming device characterized by arranging a mask and a cylindrical lens.

(E) Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a schematic explanatory diagram of a mark forming apparatus according to the present invention. A mask 3 and a cylindrical lens 4 are arranged between the laser oscillator 1 and the workpiece 2. The laser oscillator 1 is a laser using, for example, yttrium-aluminum-garnet crystal, and the workpiece 2 is a printed board or the like, the surface of which is coated with ink. The mask 3 is made of phosphor bronze, brass, or the like, which does not melt even when exposed to laser light, and has a rectangular slit 5 with dimensions AXB formed inside. This slit 5 is large enough to cover most of the area of the beam 6. Further, the cylindrical lens 4 narrows down the dimension in the A direction of the beam 6 that has passed through the rectangular slit 5, but leaves the dimension in the B direction unchanged.

To explain in detail the present invention according to the above configuration, first, the beam 6 irradiated from the laser oscillator 1 is cut into a rectangular shape by the slit 5, and the beam 6 that has passed through the slit 5 is cut into a rectangular shape by the slit 5.
only the light is incident on the cylindrical lens 4. Here, the rectangular beam 6 reaches the surface of the workpiece 2 with only the A dimension narrowed down while the 8 dimensions of the slit 5 remain fixed. The surface of the workpiece 2 absorbs the laser beam and is heated to a high temperature by the beam 6 focused into a rectangular shape with the vertical and horizontal dimensions of bx2, and the ink applied to the surface of the workpiece 2 is melted and decomposed.

Therefore, the surface color of the workpiece 2 is exposed only in the core portion, and the mark 7 is formed.

In this case, most of the area of the beam 6 is used as the area of the slit 5, so that energy can be used effectively. Note that although the above value approximates the B value of the slit 5, it does not strictly match due to light diffraction and the like. Therefore, the final dimension of the mark 7 is determined by changing the position of the cylindrical lens 4 within the optical path or by using cylindrical lenses 4 having different focal lengths.

Next, in FIG. 2, a mask 8 and a cylindrical lens 9.10 are placed between the laser oscillator 1 and the workpiece 2. In FIG.

Inside the mask 8, there is an A' inscribed in the diameter of the beam 6.
A square slit 11 with dimensions X'A' is formed, and the cylindrical lenses 9 and 10 are provided so that the generating lines of their cylindrical surfaces are perpendicular to each other. In the case of the above configuration, when the beam 6 passes through the mask 8, it becomes A'XA' of the square slit 11, and each dimension is the same as that of the cylindrical lens 9.
10 to form a rectangular mark 12 of a'Xb' on the surface of the workpiece 2. In this case, even more efficient energy use can be achieved.

Furthermore, in FIG. 3, a mask 13 is placed between the laser oscillator 1 and the workpiece 2, and the mask 13 has an A"
A rectangular sulin 1-14 with dimensions of ×B" is drilled. In this case, the beam 6 is directly transmitted without using a lens.
is made into a rectangular shape with slit 14 as it is as work 2
By irradiating the surface of the slit 14, a mark 15 having dimensions a"xb" approximately equal to the dimensions of the slit 14 is formed. In this case, the energy efficiency is low, or the rectangular mark 15 can be formed with a simple structure simply by arranging the mask 13.

Although the above description has been made using the laser oscillator 1 as an example of the light source, the present invention is not limited to this; for example, it is also possible to use a method of coloring using heat rays such as infrared rays as the light source and using thermal paper as the workpiece 2. .

(F) Effects of the Invention Since the present invention is configured as described above, a mask 3 having rectangular slits 5 and 11 between the light source 1 and the workpiece 2 is provided.
, 8 and cylindrical lens 4. 9. 10, it is possible to obtain a mark 7.degree. 121 of any size with a simple structure and by effectively utilizing the energy of the light source 1.

[Brief explanation of the drawing]

Figure 1 shows a mark forming device with one cylindrical lens placed between the light source and the workpiece, Figure 2 shows a mark forming device with two cylindrical lenses, and Figure 3 shows mark forming using only a mask. FIG. 2 is a schematic explanatory diagram of the device. ■...Laser oscillator 2...Work 3.8.13...Mask 4.9.10...Cylindrical lens 5.11.14...Slit 6...Beam 7.12.15... ...Marks Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a mark forming device that forms marks on the surface of a workpiece by irradiating energy from a light source, a mask having a rectangular sulin +- and a cylindrical lens are arranged between the light source and the workpiece. A mark forming device characterized by: 2. The mark forming device according to claim 1, wherein two cylindrical lenses are provided so that the generating lines of their respective cylindrical surfaces intersect with each other.