JPH01127186A - Laser beam machine - Google Patents

Abstract

PURPOSE:To improve safety of a worker by providing a laser beam oscillator to generate a first laser beam and arranging a second laser beam generation means with power feebler than it and producing an alarm via the change of the quantity of photodetection of a second laser beam. CONSTITUTION:A laser light source 1 to generate a laser luminous flux 2 is provided and a composite prism 3 consisting of two parts 3I and 3II is arranged to the inlet side to an optical system 6 of the laser luminous flux 2. The luminous flux 2 from the light source 1 is split into an intense luminous flux 4 of the central part and a feeble ring luminous flux 5 surrounding its periphery by the prism 3. When the hand, etc., of the worker to adjust the optical system 6 shut off the luminous fluxes 4 and 5, a signal of the quantity of photodetection of the ring luminous flux 5 is sent from a photodetecting element 7 to a comparator 9 and when the quantity of photodetection is reduced below a reference value, an alarm 11 functions. By this method, since the light source 1 is treated safely, the safety of the worker is improved.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a laser device that uses a laser beam.

(Prior Art) Conventionally, NC processing machines, video disk exposure devices, and the like have been used as laser-based machines. In particular, the video disc single-source device uses a laser beam fX of the original energy.
: [The eyes form a complex optical path. However, when adjusting the optical path, an obstacle may enter the optical path and the scattered light may enter the adjuster's eyes, or the limit adjuster's strength may enter the optical path and cause injury to Sae. There was a risk of being exposed. At times, infrared % outside laser? The risk of such an accident is high because the person handling the item cannot see the honor directly.

This 7) J: Eel C poses a serious problem in terms of safety (m71).

(The problem was solved: 9 and the peak) During the optical length adjustment work mentioned above, the worker was exposed to light as a TF concubine, or as scattered light. There was a potential for 0T to cause an injury accident.

Therefore, an object of the present invention is to provide a laser equipment #Lv that can be used safely and conveniently.

[Structure of the Invention] (Means for Solving Problems) The present invention includes a laser oscillator that generates a laser @1, a means for generating a laser @2 with a weaker power than this laser around this laser, means for receiving the second laser beam by this means; means for outputting a signal when the number of children receiving the laser beam by this means falls below a predetermined value; and an alarm means activated by the output signal from this means. %: Characteristic laser oscillator.

(Function) A weak light is spread around the laser, and if an injury from a hand or a lake enters during this light, the laser will be removed before the injury from the hand or a pond reaches the laser. It is possible to take measures such as stopping the oscillation or issuing an IF signal. Additionally, it is possible to provide a laser device f with extremely high safety.

(Implementation row) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a laser light source (1
The light beam (2) emitted from the prism (3) is divided into a strong center (4) and a weak ring (5) surrounding it.
). Weak center honor (4) and ring honor (5)
is an optical system (6) consisting of lenses, mirrors, etc. (not shown).
) enters the light receiving element (7) in x ways. The optical system (6) is currently being adjusted, and one worker's hands have a luminous flux of +41,
+51 Y: There is a possibility of blocking. A signal X proportional to the received light of the ring light (5) is sent from the light receiving element (7) to the comparator (9).

The comparator (91 is connected to this signal and the reference hawk input terminal (10
), and if the light shade is lower than the reference (direct), it sends a signal to the alarm (11).The alarm (11) is the section where the comparator (9171 Only with buzzer (12)? I-ring 1 The alarm was not emitted to the worker.

Current or shutter of laser light source (1)? Manipulated Shoten I
Decrease or stop tk. In response to this, Eli and the worker said,
The existence of obstacles can be vm before the lR book blocks the strong center honor (4) and can be automatically turned back on.

Figure 2 shows the optical splitting prism used in the present invention (Figure 1).
), this prism has two parts (3I
) (311), each of which is a rotating body whose central axis is the axis through which the luminous flux (2) passes, and at Vl, the prism (
3I) and (3■) should be fitted together without any gaps.

The honor (
A part of 2) is reflected by the conical reflecting surface a, and the full light is further reflected by the cone, resulting in a ring honor (5). Opposing cones [fia and b are set in opposite positions so that they are in a preliminary motion, the center value * (4) and the ring honor (
5) is a preliminary light. Prism (3) as mentioned above
is rotationally symmetric with respect to the luminous flux (2).
is the light intensity distribution Ik of the Gaussian beam, where the center beam (4) and the 0 beams (2) surrounding it are shown in FIG. The intensity ratio between the ring light (5:) and the center light (41) can be freely changed by selecting the reflectance of the conical surface aO.Also, by setting the entrance surface C and the exit surface dk- and + row surfaces, the ft,!!(21) and Chuo Koei (4) have the characteristic that except for the intensity, the Kuto area and the intensity distribution 1st do not change. Therefore, by installing this prism (3), the 1st
The influence on the optical system (6) in the figure is small, which shows that the present invention can be easily applied to any optical system.

By the way, during the adjustment of the optical system, the light beam is often read intermittently, so that short-term light ambiguity on the light-receiving element (7) often occurs. This TLE alerted all 1
In order to imitate a decrease in workability, -1? Injuries such as burns are caused by the product of % light intensity and bright light time (7).

If it lasts for a certain amount of time, it is considered that there is little danger. Therefore, if the light intensity decreases within a certain period of time, the configuration sequence that does not include [C] is shown in Fig. 4 as the second implementation da 1, and @5
The figure shows the signals of each part in Fig. 2.

The ring light (5) enters the light receiving element (7). The comparator (23) is connected to the received light signal tAl and the reference box input terminal (24).
When the signal from fK A') decreases from the reference (direct), the signal (81 is generated. 1δ+B+
is a signal t delayed by a certain time T due to delay 4-Raku (25)
The oAND circuit (26) serving as el takes the logical product D) of the % signal tel and the signal 1c) and sends it to the oscillator (27). IF
The oscillator 27) outputs a good news signal to the output terminal (28) to operate the light source and buzzer. With this configuration, an alarm will be issued only when the luminous flux is blocked for a certain period of time T or more, @
It is possible to prevent unnecessary alarms from occurring during adjustment as described above. Furthermore, even if the structure shown in FIG. 1 is modified such that the frequency characteristics of the light receiving element (7) are kept low so that it does not react to short-term drops in the optical antinode, the same effect as in the second embodiment can be obtained.

FIG. 6 shows a third embodiment 2 of the present invention.

The ring light (5) enters the light receiving element (7). The light reception signal passes through a differentiating circuit (33), becomes a signal proportional to the rate of change of light, and enters a comparator (34). The comparator (34) compares the differential signal e with the input from the reference 1fi input terminal (35), and sends a signal to the alarm (36) if the light weight reduction rate exceeds the reference value. The vibrator (36) receives the output of the comparator (34) 7) and outputs the alarm signal to the output terminal (37) to operate the light source and buzzer.

With this configuration, it is possible to prevent the occurrence of an alarm due to slow fluctuations in the light intensity of the laser light source, and to generate an i-report only when there is a sudden fluctuation in light caused by an obstacle entering the light source.

In the configurations shown in FIGS. 1 and 4, the low frequency components of the outputs of the light receiving elements (7) and (22) are multiplied by a positive constant of 1 or less! Create an arithmetic unit that generates a direct signal, and connect the output of the CD multiplier to the comparator reference direct input terminals (10) and (24).
The same effect as the third implementation column can be obtained by adding .

Further, the first embodiment shown in %1N and FIG.

Furthermore, in the AM series mentioned above, a prism was installed to split the beam from the laser light source and create a ring luminous flux. Second, it may be implemented without departing from the spirit of the present invention.

[Effects of the invention] If the present invention is applied to the above-mentioned device in detail, it will be possible to eliminate unnecessary threats by placing obstacles such as hands or tools in the high-energy beam, issue an i-report, and perform safety measures such as light shielding. can be carried out promptly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first implementation row of the present invention, FIG. 2 is a diagram showing a prism used in the present invention, FIG. 3 is a sectional view showing an optical path in the prism that generates a ring-shaped beam, Figure 4 is a configuration diagram showing the second embodiment of the present invention, Figure 5 is @2
FIG. 6 is a diagram showing a third practical example of the present invention. 1... Laser light source, 2... Honor, 3... Prism, 4... Central luminous flux & 5... Ring Honor % 6...
・Optical system, 7... Light receiving element, 8... Hand, 9... Comparator, 10... Reference direct input terminal, 11... g
I11 device, 12...Buzzer 123...Comparator, 24...Reference direct input terminal, 25...Delay circuit, 2
6...AND circuit, 27...U oscillator, 28...output terminal, 33...differentiation circuit, 34...comparator, 35...Hanawa quasi-input terminal, 36...alarm vessel, 37
...Output terminal. Agent Patent Attorney Norihiro Chika Udo Koyama Hikaru 2nd 1st
Figure 5

Claims (2)

[Claims] (1) A laser oscillator that generates a first laser, a means for generating a second laser with a weaker power than this laser around this laser, a means for receiving the second laser by this means, and this means 1. A laser device comprising means for outputting a signal when the amount of light received by the laser becomes less than a predetermined value, and an alarm means activated by the output signal from this means. (2) The means for receiving the second laser includes a delay circuit that delays the output from this means for a certain period of time, and an AND circuit that takes a logical product of a signal delayed by this delay circuit and a signal that does not go through the delay circuit. 2. The laser device according to claim 1, wherein the laser device comprises: a laser device comprising: a laser device; and an output of the circuit activates the alarm means.