JPS6037625B2 - Laser beam irradiation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser beam irradiation device suitable for use in various measurements, machining, etc.

In particular, the present invention relates to a safety device for protecting the human body from being erroneously irradiated with laser beams. Laser devices that emit sharp light beams have come to be used in various measuring instruments and work tools, but if the laser beam accidentally irradiates the human body, an unexpected accident may occur. The present invention provides a safety device for this purpose, and aims to provide a device that automatically detects when a person approaches the irradiated laser beam and stops or attenuates the laser beam. .

The present invention includes a lens system that condenses infrared rays emitted within a solid angle that includes the solid angle of the irradiated laser beam, and a photoelectric converter disposed at the convergence point of this lens system,
It is characterized in that it is configured to automatically stop or attenuate emission of the laser beam by the electrical output of this photoelectric converter. Here, so that the infrared rays detected by the photoelectric converter have a wavelength corresponding to the body temperature of a human body, it is preferable that the lens system or the photoelectric converter is provided with a transmission filter having a wavelength corresponding to that wavelength. This will be explained in more detail with reference to the drawings.

FIG. 1 is a plan view showing the overall configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is also a side view thereof. 1 indicates a laser beam irradiation device, and 2 indicates an object to be irradiated.

3 indicates Caesar ray.

This entire system is for measuring mechanical vibrations of the irradiated object 2 using a laser beam. A laser beam 3 is emitted from a laser 4, and the beam forms a solid angle shown by diagonal lines in the figure. The device 1 is equipped with the device 1.

FIG. 3 is a block diagram of the main parts of the apparatus according to the embodiment of the present invention.

That is, the laser 4 emits a laser beam 3, and the lens system 6 focuses the laser beam within a solid angle 5 that includes the solid angle of the laser beam 3. This lens system 6
The light beam focused by is passed through an infrared filter 7,
The light hits the photoelectric converter 8 placed at the focal point. The electrical output of the photoelectric converter 8 is applied to an amplification controller 101, and the output is guided to a control input of a switch 11.

This switch 11 connects the output of the power supply 12 to the laser driver 13.
is inserted into the passageway that supplies the The output of the laser driver 13 drives the laser 4. In the device configured as described above, when a heating element that emits infrared rays enters within the solid angle 5, the photoelectric converter 8 detects this and sends out an output, and the amplification controller 10 amplifies this. The switch 11 is controlled to open.

The infrared rays transmitted by the infrared filter 7 are absorbed by the body temperature (30
~40q0), and the gain of the amplification controller 10 is set high enough, the switch 11 can be configured to open when a part of the human body enters the range of the solid angle 5. Can be done. In the above embodiment, the laser beam is stopped by stopping the power supply of the laser driver, but there are also methods that reduce the power of the laser beam and attenuate it to a non-hazardous extent, and a mechanical device installed in front of the laser to stop the laser beam. Alternatively, the present invention can also be carried out by using a device provided with a filter. As described above, according to the present invention, when the heating element approaches the laser beam, the laser beam can be stopped or weakened to prevent danger.

In particular, the present invention is effective only when the object that approaches the laser beam is a heating element, so it has an excellent feature that it does not malfunction due to the approach of various devices or objects for testing using laser beams. be. By matching the wavelength of infrared rays to the wavelength of infrared rays corresponding to the human body's body temperature, it is possible to selectively detect the approach of a human body, and the laser beam is not stopped needlessly due to the approach of another object, making it safer. It is effective in ensuring that

[Brief explanation of the drawing]

FIG. 1 is a plan view of the entire apparatus according to the present invention. Figure 2 is its side view. FIG. 3 is a configuration diagram of an apparatus according to an embodiment of the present invention. 1... Laser beam irradiation device, 2...
・Irradiated object, 3... Laser beam, 4...
Laser, 5... Buddha body angle, 6... Lens system,
7...Infrared filter, 8...Photoelectric converter, 10...Amplification controller, 11...
Switch, 12...Power supply, 13...Laser driver. Boat 1 figure rare 2 figure rare figure

Claims (1)

[Scope of Claims] 1. A lens system that condenses infrared rays emitted within a solid angle that includes the solid angle of the irradiated laser beam, and a photoelectric converter disposed at the converging point of this lens system. A laser beam irradiation device comprising: an electric circuit means for automatically stopping or attenuating emission of the laser beam using the electric output of the photoelectric converter. 2. The laser beam irradiation device according to claim 1, wherein the infrared rays detected by the photoelectric converter are infrared rays of a wavelength corresponding to the body temperature of a human body.