JPH0639567A - Laser marking method - Google Patents

Abstract

PURPOSE:To enable the fine marking and to facilitate the change of the contents of the marking by irradiating the laser beam upon the ink ribbon which is brought close to or brought into close contact with the part to be marked, and executing the specified marking by the evaporated ink. CONSTITUTION:The laser beam 2 outputted from a laser beam oscillator 1 passes through a collimator 3, and then gets incident on a reflective mirror 4 and a f-theta lens 6 through a bi-axial galvanometer 5, and converges and irradiates upon an ink ribbon 8 which is brought close to a part 7 to be marked. The laser beam 2 converged on the ribbon 8 is scanned by the galvanometer 5 which is driven/controlled by a computer, and the locus indicates the letters or symbols to be marked. This constitution allows the marking which is not dependent on the workability of the stock to be marked, and enables a fine marking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser marking method used for marking electronic parts and the like.

[0002]

2. Description of the Related Art In recent years, marking of models, serial numbers, etc. on electronic parts using a laser has become popular. As a method that does not use a laser, an ink mark by a stamp is generally used, but it has problems that fine marking cannot be performed and that the stamp is replaced every time the model is changed.

FIG. 2 shows an example of conventional laser marking. In FIG. 2, 1 is a laser oscillator, 2 is a laser beam, 3 is a collimator, 4
Is a reflection mirror, 5 is a galvanometer, 6 is an f-θ lens, and 7 is a component for marking. The laser beam output from the laser oscillator is f−θ.
The light is focused on a part to be marked by a lens, and the movement trajectory of the focus is scanned by a galvanometer driven and controlled by a computer (not shown) so as to draw a predetermined character or symbol. Since the condensing point of the laser beam has a high energy density, a processing mark remains on the movement trajectory, and as a result, a predetermined character or symbol is marked. Further, the characters and symbols to be marked can be easily changed by computer software.

[0004]

In the conventional laser marking, the surface to be marked is subjected to removal processing by a laser beam, and a predetermined character or symbol is imprinted by the processing mark. Therefore, there is a drawback that good marking cannot be performed on a material having a low laser beam absorptivity or a material having a high heat resistance, which is difficult to process even with the energy density of a laser beam.

The present invention takes advantage of the features of laser marking, which enables fine marking and can easily change the marking content, and solves the problem that the workability differs depending on the material.

[0006]

In order to achieve this object, the laser marking method of the present invention irradiates a laser beam on an ink ribbon which is close to or in close contact with a portion to be marked, and a predetermined amount is obtained by the evaporated ink. Marking is performed.

[0007]

[Operation] With this configuration, it is possible to perform marking that is not affected by the workability of the material to be marked, fine marking is possible, and the feature of laser marking that the marking content can be easily changed is impaired. Absent.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a laser beam 2 output from an Nd: YAG laser oscillator 1 passes through a collimator 3 and then enters a f-θ lens 6 through a reflection mirror 4 and a biaxial galvanometer 5 for marking. 7 shows a configuration in which the ink ribbon 8 which is brought close to 7 is focused and irradiated. The laser beam 2 focused on the ink ribbon 8 is scanned by a galvanometer 5 which is driven and controlled by a computer (not shown), and its trajectory draws a character or symbol to be marked. The focal point of the laser beam causes the ink to evaporate while being scanned on the ink ribbon 8, and the evaporated ink sequentially adheres to the parts to draw out characters or symbols to be marked. By changing the color and type of ink according to the material of the component to be marked, good marking can be realized regardless of the material of the component.

Further, the characters or symbols to be marked can be changed easily by software of a computer. Further, the ink ribbon and the component to be marked are brought into close contact with each other to narrow the range in which the ink evaporates, so that the bleeding of characters or symbols can be suppressed and fine marking can be realized.

[0011]

As described above, according to the present invention, by providing a structure in which the laser beam is applied to the ink ribbon which is close to or in close contact with the portion to be marked, and the evaporated ink makes a predetermined marking, It is possible to make good markings regardless of the materials of the parts, by taking advantage of the features of the laser markings that fine markings are possible and the contents of markings can be easily changed.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a laser marking method according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a conventional laser marking method.

[Explanation of symbols]

 1 Laser oscillator 2 Laser beam 8 Ink ribbon

Claims (1)

[Claims] 1. A laser marking method, which comprises irradiating a laser beam to an ink ribbon which is close to or in close contact with a portion to be marked, and carrying out predetermined marking with the evaporated ink.