JPS6389273A - Laser marking device - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for marking a member to be marked with a laser beam or the like, and in particular to a laser beam suitable for uniformly marking a member to be marked that is combustible. This invention relates to a marking device.

[Conventional technology]

As a conventional laser marking device, for example,
As shown in No. 0-44194, marking was performed by melting the marking portion of a noncombustible member to be marked using a laser beam. At this time, the laser beam irradiation time is kept constant to obtain uniform marking.

[Problem that the invention seeks to solve]

The above device is suitable for marking non-combustible materials.

Good markings can be obtained, but it is not suitable for marking materials such as combustible materials such as wood.

In other words, when marking is performed with a constant laser beam irradiation time, it is difficult to perform good marking in places where the part to be marked is flammable, and there is a risk of ignition in places with high flammability. I have a problem.

The purpose of the present invention is to provide a laser marking device that uniformly marks a combustible member to be marked, in view of the above points. [Means for solving the problems] The above purpose consists of a detector that detects the temperature of the combustible member to be marked, and a controller that controls the output of the laser beam so that the temperature of the member to be marked is below the exothermic temperature in accordance with the detected value from the detector. This is achieved by

[Effect]

When marking a combustible material, the amount of heat generated by a laser oscillator is irradiated onto the marking section, increasing the amount of heat in the marking section, causing the marking section to burn with charcoal and marking.At this time, an infrared sensor, etc. The detector detects the humidity of the marking part using the wavelength of infrared rays generated from the marking part. Based on this detected temperature, the laser beam is controlled so that the temperature of the laser beam irradiated to the marking portion is constant. In other words, when the temperature of the marking part rises, the output of the laser light is reduced.

The laser beam oscillator is controlled to increase the laser beam output when the temperature of the marking part decreases.

〔Example〕

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

In Fig. 1, 1 is a laser mushroom oscillator, 2 is a direction changer that changes the vertical laser beam position of the laser beam generated from the laser beam oscillator 1, and 3 is a horizontal direction changer for the laser beam that has passed through the direction changer 2. A direction changer that changes the position of only the direction,
4 is a member to be marked made of a combustible material such as wood, which is irradiated with the laser light that has passed through the direction changer 2 and is engraved with a mark;
5 is an infrared sensor of a temperature detector that detects the surface temperature of the member to be marked 4 during marking; 6 is an air blower for removing flammable gas when it is generated on the member to be marked 4; and 7 is an infrared sensor for detecting the surface temperature of the member to be marked 4. To get the marking,
An amplifier that drives the direction converters 2 and 3 to change the direction of the laser beam and also changes the direction of air blowing, 8 is an infrared sensor 5
Control inputs the detected temperature of the member to be marked 4, and if the irradiation temperature of the member to be marked 4 is low, increases the laser light output and instructs the amplifier 7 to move the laser light to obtain a predetermined marking. 1. Next, the operation of the device of the present invention will be explained.

First, the command value (laser movement speed) is sent from the controller 8 to the amplifier 7.
Output. The amplifier 7 drives a motor that moves the vertical and horizontal direction converters 2 and 3 according to the command value. The same signal is also sent to the direction changing motor of the blower 6. In this way, the laser beam whose direction is changed by the direction changer 2.3 and the wind whose direction is changed by the direction change motor of the blower 6 can always be applied to the same point on the member 4 to be marked. At this time, the temperature of the member to be marked is obtained by detecting the wavelength of infrared rays using the infrared sensor 5. By detecting the wavelength of this infrared ray, the temperature of the marking part is calculated.

Then, the controller 8 compares the detected temperature with the marking setting fuX degree set individually for the member to be marked 4, and calculates the deviation.

By the way, the laser light output and the temperature at the marking part are
There is a relationship shown in the figure. That is, the relationship between the laser light output or the marking part temperature T is expressed by equation (1). (A is a constant specific to the part to be marked) X=AT
(1) In equation (1), equation (2) is obtained when the temperature of the marking part is constant.

AT' 工・工□ ...(2) Here, X
A command value is output to the laser beam oscillator 1 so that the laser beam output X' calculated from equation (2), where ' is the laser beam output and T' is the set temperature, is the laser beam output X'.

Therefore, the temperature of the marking part can be kept constant.

According to this embodiment, since the temperature of the marking part can always be kept constant, it is possible to make the charcoal burning by the member to be marked uniform, and it is also possible to prevent the occurrence of ignition, so that the marking surface due to one ignition can be It becomes possible to prevent carbonization of unnecessary parts.

Another embodiment of the present invention will be explained with reference to FIG. In this embodiment, the amount of air blown is removed from the previous embodiment.

Measuring the temperature of the marking part with the infrared sensor 5.
Ignition occurs in the marking portion when the laser beam is irradiated for a long time even with the same output power. By the way, when the laser output is the same, there is a relationship between the marking part temperature and the irradiation time to the marking part as shown in FIG. That is, there is a relationship between the irradiation time t and the marking part temperature T as shown in equation (3).

T=Bt (3) (B is a constant unique to the member to be marked) If the temperature of the marking part is constant, equation (3) can be changed to equation (4).

Here, t' is the irradiation time, and the laser beam moving speed V is calculated by the formula (5) so that the irradiation time is calculated by the formula (4)6. (a constant unique to the marking member) The V value calculated using equation (5) is commanded to the amplifier 7.

Moreover, if the output of the laser beam and the moving speed are kept constant, and only the air is blown to the marking part.

Combustible gas, which is one of the causes of ignition, can be removed.

〔Effect of the invention〕

According to the present invention, there are the following effects.

(1) Since the temperature of the marking part can be kept constant, uniform marking can always be applied even if the combustible material to be marked is uneven.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the laser marking device of the present invention, and FIG. 2 is a diagram showing the relationship between laser light output and marking part temperature in the present invention. FIG. 3 is a diagram showing the relationship between laser irradiation time and marking part temperature, and FIG. 4 is a schematic diagram showing another embodiment of the present invention. 1... Laser light oscillator, 2, 3... Direction changer, 4
... Member to be marked, 5... Infrared sensor, 7.
...Amplifier, 8...Controller.

Claims (1)

[Claims] 1. A laser marking device that is equipped with a laser beam oscillator that oscillates a laser beam and a converter that changes the direction of the laser beam, and that imprints a mark on a member to be marked using the laser beam. It is characterized by comprising a detector that detects the temperature of the member to be marked, and a controller that controls the output of the laser beam so that the temperature of the member to be marked is below the heat generation temperature according to the detected value from the detector. Laser marking equipment. 2. The laser marking device according to claim 1, wherein combustible gas generated from the combustible member to be marked is removed.