JPH0428085B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser light protection wall that protects human bodies, processing machines, products, houses, etc. from high-output laser light.

With the advancement of science and technology, there is a demand in the field of machining technology for the development of technology for processing various mechanical parts with high precision and fineness, and in response to this demand, technology using laser light is progressing. However, in the case of machining etc. using laser light, it is necessary to use a high-power laser, and the irradiation of this laser light or reflected light not only causes serious injury to the human body, but also Irradiation of anything other than the product may cause serious accidents or damage such as destruction or fire.

Currently, acrylic plates, firebricks, carbon plates, etc. are used as protective walls for laser beams to prevent these disasters, but these protective walls do not have sufficient protection against powerful laser beams or reflected light. It cannot be said that it is fulfilling its role. For example, an acrylic material will no longer serve as a protection at 1w/ ^cm2 grade, a 5cm thick firebrick will last only about 30 seconds with a 200w/ ^cm2 laser beam, and a 5cm thick carbon plate will last only about 30 seconds. However, they all have short durability, as they will be damaged in about 10 hours with a 200w/cm ² laser beam. Moreover, since these are generally used as fixed protective walls, a large amount of cost is required when installing or relocating them.

In view of these points, the present invention provides a protective wall that is inexpensive and has a long durability by flowing water or an aqueous solution mixed with a dye in a layered manner and using this laminar flow as an absorbing material for laser light. .

For example, laser light from a carbon dioxide laser (CO ₂ ) has the property of being absorbed by water, and the present invention utilizes this property to construct a protective wall. The present invention will be described below with reference to the drawings.

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a side view thereof, showing an example in which the laser light or reflected light of a carbon dioxide laser travels in the direction of the arrow. water 1
is a pipe 2 that has a laminar flow function due to the propagation path, etc.
and reaches the upper part of the laminar flow guide 3. Since the pipe 2 is provided with an opening on the lower side, the flow becomes a laminar flow and falls through the laminar flow guide 3.

When laser light or its reflected light is directly incident on this laminar flow 1, the laminar flow itself acts as a laser light absorber, where it is almost completely absorbed.

However, the laminar flow referred to in this book is not limited to any form as long as the area to be protected from laser light can be continuously protected by an unbroken flow, and includes not only so-called laminar flow and turbulent flow, but also waterfalls. This is a comprehensive expression that includes forms such as flow (shower-like flow).

Rather than the specific form of the fluid, as mentioned above, (a) the laminar flow 1 is an uninterrupted continuous flow, and (b) the laser beam or its reflected light is It is important to directly enter this laminar flow 1.

When a laser beam with a powerful output is incident, even if the liquid part that absorbs it evaporates instantaneously, if there is no break in the laminar flow 1 as in (a) above, the incident The point is immediately supplied with the next fluid stream and can therefore continue to absorb such intense energy.

Also, as seen in (b) above, this laminar flow 1
Injecting laser light or its reflected light that should be directly absorbed into the laminar flow means, conversely, that the light energy does not pass through a glass plate or other medium before entering the laminar flow. However, of course, such solid materials cannot continue to stably absorb the high-output laser light that is the subject of the present invention for a fairly long period of time, and in most cases they will melt or break. This is because it will cause

However, the device itself that continuously supplies the laminar flow 1 without any break is not limited to the device system shown in the first diagram, and the present invention can also be realized by changing the method of introducing and outflowing the fluid flow. There is no necessity to define a particular method.

On the other hand, with respect to the laser light incident surface formed by the laminar flow 1, on the opposite side, simply put, on the back side of the laminar flow 1, there may be a laminar flow guide 3 as shown in the illustrated embodiment. In particular, if this laminar flow guide 3 is composed of a carbon plate or other material, even if laser light or its reflected light can pass through the laminar flow 1, this laminar flow guide will perform an additional protective function. , the result is even more desirable. In addition, in the figure, 4 is a foot, 5 is a foot of the laser beam protection wall, and 6 is a connection part to which the protection wall can be connected.

Furthermore, if it is necessary to adjust the thickness of the laminar flow according to the intensity of the laser beam, the pipe 2 may be replaced with a structure that can control the thickness of the laminar flow.
Further, in this embodiment, the laminar flow is constructed using gravity, but this can be changed depending on the location of machining etc. and the application. For example, when drilling small holes in a workpiece, the laser beam may be installed so as to irradiate it from above to below. In this case, the laminar flow flows horizontally with an appropriate inclination. Although the embodiment has been explained using a carbon dioxide laser, if a dye is mixed in depending on the wavelength of the laser light, it can function as a protective wall against other laser lights as well, as in the case of the CO ₂ laser.

As described above, the present invention can provide a protective wall that can sufficiently function as a protective wall for laser light by using water or an aqueous solution mixed with a dye, which is an inexpensive and simple method, so the practical effect is extremely large. be.

[Brief explanation of drawings]

FIG. 1 is a front view of the present invention, and FIG. 2 is a side view thereof. 1...Water, 2...Pipe having laminar flow function,
3...Laminar flow guide.

Claims (1)

[Claims] 1. Water or an aqueous solution mixed with a dye is formed into layers and flows continuously without any breaks, and this laminar flow is directly irradiated with a laser beam, and the laminar flow is converted into a laser beam absorber. A protective wall for laser light characterized by;