JPS62211165A - Marking method - Google Patents

Abstract

PURPOSE:To enable uniform and sharp printing to be performed by combining a process for brushing or blowing a work to be marked with a process for emitting a laser beam to and marking the work to be marked. CONSTITUTION:A laser beam (A) focused in the form of a square or a strap- shaped beam by a focusing lens 1 is projected to a work to be marked 4 through a stencil 2 and an image formation lens 3, printing the pattern of the stencil 2. after emission of a laser beam for a prearranged time, a compressed air (B) is blown onto the work 4, and the remaining waste of the work generated by the emission of a laser beam is blown off. Later the laser beam is emitted again for a prearranged time. Thus sharp printing can be performed by alternately repeating a laser beam emission process and a blowing process several times.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a marking method for printing various patterns on the surface of an object using a laser beam.

[Conventional technology] More than 20 years after its invention, lasers are now used for drilling holes.

It is attracting attention in various processing technology fields such as cutting and welding. Marking devices that print various patterns on the surface of objects using laser beams are also already known.

As a conventional marking device using a laser beam, there is one that prints a pattern by irradiating a laser beam onto an object to be marked through a stencil in which a printing pattern is punched out.

FIG. 2(a) is a diagram showing an example of a conventional marking method using one laser beam, and FIG. 2(b) is a sectional view of an object to be marked printed with a laser beam.

In this figure, 21 is a condensing lens that condenses the laser beam, 22 is a stencil arranged in the path of the laser beam and has a printed pattern punched out, 23 is a 1/lens imager, and 24 is a glass plate, etc. This is the object to be marked.

In this conventional marking method, a print pattern punched out on a stencil 22 is printed on the object to be marked 24 using a laser beam.

When a glass plate or the like is used as the object to be marked 24, a desirable mark cannot be obtained. In other words, it is preferable that marks are printed as shown in dotted lines on the object to be marked 24 shown in FIG. 2(b). However, in reality, uneven printing will be obtained.

[Problems to be solved by the invention] As described above, in the conventional marking method using a laser beam, when marking is performed with a laser beam on an object to be marked such as a glass plate, the depth of the marking is There were problems in that the print was shallow and had many irregularities, resulting in uneven and unclear prints.

In view of these problems, it is an object of the present invention to provide a marking method that can provide uniform and clear printing even when marking an object to be marked, such as a glass plate, with a laser beam. It is.

[Means for Solving the Problems] In order to achieve this object, the present invention combines the step of irradiating the object to be marked with a laser beam to mark it with the step of brushing or blowing the object to be marked.

[Operation] By doing this, it becomes possible to print uniformly and clearly, like when marking a plastic plate with a laser beam. The reason may be as follows. That is,
When marking a glass plate by irradiating a laser beam, unlike when irradiating a plastic plate with a laser beam, the glass plate does not melt and evaporate to form the marking.

Printing is achieved by locally generating a thermal crank and partially peeling off the flakes. Therefore, small pieces peeled off by irradiation with one norther beam remain in the irradiated area. Since the laser beam is further irradiated from above the remaining glass pieces, it is thought that the printing becomes uneven and uneven as shown in FIG. 2(b). By the way, in the case of the marking method according to the present invention, a brushing or blowing step is also combined, so that by this step, the small pieces that have been molten by the laser beam irradiation are removed from the surface of the object to be marked. It is thought that when laser beam irradiation is performed subsequently, the bad shadow caused by the glass particles disappears, and uniform printing becomes possible.

[Example] Hereinafter, the present invention will be explained in detail with reference to the drawings. Figure 1 (,) shows 1. FIG. 1(b) is a diagram showing an outline of an embodiment of the marking method according to the second invention, and FIG. FIG. 3 is a cross-sectional view of a marked object. In this figure, 1 is a condenser lens, 2
3 is an imaging lens, 4 is an object to be marked such as a glass plate, and 5 is a blower for blowing compressed air onto the object 4 to be marked.

Next, details of this marking method will be explained. Laser light emitted from a laser light source is focused into a rectangular or 41'-shaped beam by a focusing lens 1. This laser beam is stepped onto the object 4 to be marked via the stencil 2 and the imaging lens 3, and the pattern punched out in the stencil 2 is printed on the object 4 to be marked.

After irradiating the laser beam for a predetermined period of time, the blower 5 is turned on and compressed air is blown onto the object 4 to be marked, thereby removing small pieces that are the remains of the object to be marked, which are generated by the irradiation of the laser beam. (Figure 1 (a))
5 tepl, 5 tep2).

Then again. Laser beam irradiation is performed for a predetermined period of time. As shown in step 2, by repeating the laser beam irradiation process and the blowing process several times alternately, clear printing becomes possible (step 3 in Figure 1 (,)). In the embodiment, the laser beam irradiation step and the blowing step are alternately repeated, but both steps may be performed simultaneously, or the surface of the object to be marked may be machined instead of the blowing step. It is also possible to use a process of brushing. It goes without saying that when a brushing process is used, it is necessary to alternately repeat the laser beam irradiation process and the brushing process.

Further, in one or more embodiments, printing is performed by projecting a pattern punched out by a stencil onto the object to be marked, but the stencil and the object to be marked are placed close together without using an imaging lens. This is also possible in the case of a close-contact type. In this case, compressed air can also be blown from the gap between the stencil and the object to be marked.

Furthermore, even when printing is performed by using a cylindrical lens in the condensing lens 1 to obtain a belt-shaped beam and scanning this beam, it is possible to combine the laser beam irradiation process and the blowing process. be.

[Effects of the Invention] As is clear from the above description, according to the present invention, laser beam l, By combining the process of irradiating and marking with the process of brushing or blowing the object to be marked, uniform and bright printing becomes possible.

[Brief explanation of drawings]

FIG. 1(a) is a diagram schematically showing an embodiment of the marking method according to the present invention, and FIG. 1(b) is a diagram illustrating the process in which an object to be marked is printed by the marking method according to the present invention. Figure 2 (, ) is a cross-sectional view of the object to be marked at each stage. FIG. 2(b), which is a diagram showing an example of a conventional marking method, is a cross-sectional view of an object to be marked printed using the conventional marking method. In the figure, 2: stencil 4: object to be marked 5 nib blower

Claims (2)

[Claims] (1) In a method of marking an object by irradiating the object with a laser beam, it is possible to combine the step of irradiating the object with a laser beam to mark the object and the step of brushing or blowing the object. Characteristic marking method. (2) Claim (1) characterized in that the step of irradiating the object to be marked with a laser beam to mark it and the step of brushing or blowing the object to be marked are repeated at least twice. marking method.