TWM486507U - Laser machining system, detection module and determination circuit - Google Patents

Description

Laser processing system, detection module and judgment circuit

The present invention relates to a system, a module and a circuit, and more particularly to a laser processing system, a detection module and a judgment circuit.

The laser processing system generates a laser beam and irradiates the laser beam on the surface of the workpiece to be processed, and performs laser cutting, heat treatment, laser drilling, laser welding, etc., and has a wide range of uses, and the lightning irradiated on the workpiece. The beam needs to maintain a certain power level in order to maintain the processing quality, as shown in Figure 1.

However, when the laser processing system is unable to generate a stable laser beam due to some abnormal conditions, as shown in Fig. 2, the result after processing is uneven, resulting in serious quality problems.

Therefore, the first object of the present invention is to provide a laser processing system that detects the power of a laser beam and adjusts whether or not the laser beam is concentrated to maintain processing quality.

Therefore, the novel laser processing system is applicable to a workpiece and includes: a laser source for generating a laser beam; An optical path module receives the laser beam from the laser source and directs a transmission path of the laser beam, and generates a transmitted light associated with the laser beam, and is controlled by a control signal to determine whether Converging the laser beam to illuminate the surface of the workpiece for processing; and detecting a module electrically connecting the optical path module and receiving the transmitted light from the optical path module, and generating the light according to the power of the transmitted light a control signal; when the power of the transmitted light is not within a normal range, the control signal controls the optical path module not to converge the laser beam; and when the power of the transmitted light is within a normal range, the control signal controls the optical path module The laser beam is concentrated to illuminate the surface of the workpiece for processing.

A second object of the present invention is to provide a detection module that detects the power of a laser beam and adjusts whether or not to converge the laser beam.

Therefore, the detection module of the present invention comprises: a judgment circuit comprising: a photodetector, receiving a laser beam, converting the laser beam into a voltage signal and outputting, and a comparator, electrically connecting The photodetector receives the voltage signal, compares the voltage signal with a stored first threshold and a second threshold, and outputs a notification signal; when the voltage signal is greater than the first threshold The value is less than the second threshold, the logic level of the notification signal is a first logic level; when the voltage signal is less than the first threshold and greater than the second The threshold value, the logic level of the notification signal is a second logic level.

A third object of the present invention is to provide a judging module for judging whether the power of a laser beam is within a normal range.

Therefore, the present invention provides a judging circuit comprising: a photodetector that receives a laser beam and converts the laser beam into a voltage signal and outputs the same; and a comparator electrically connected to the photodetector to receive the photodetector a voltage signal, and comparing the voltage signal with a stored first threshold and a second threshold, and outputting a notification signal; when the voltage signal is greater than the first threshold or less than the second threshold The logic level of the output signal is a first logic level; when the voltage signal is less than the first threshold and greater than the second threshold, the logic level of the output signal is a second logic Level.

1‧‧‧Laser source

311‧‧‧Photodetector

2‧‧‧Light path module

312‧‧‧ Comparator

21‧‧‧First total reflection mirror

313‧‧‧First-stage operational amplifier circuit

22‧‧‧second total reflection mirror

23‧‧‧ Focusing mirror

312‧‧‧Second stage operational amplifier circuit

24‧‧‧Partial mirror

25‧‧‧Light Stopper

32‧‧‧Laser Control Card

26‧‧‧Acousto-optic modulator

33‧‧‧Microprocessor

3‧‧‧Detection module

4‧‧‧Feed module

31‧‧‧Judgement circuit

5‧‧‧Workpiece

Other features and effects of the present invention will be clearly shown in the embodiments with reference to the drawings, wherein: FIG. 1 is a measurement diagram illustrating a state in which the power of a conventional laser processing system is stable; FIG. Is a measurement, indicating that the power of the laser processing system is unstable; FIG. 3 is a block diagram illustrating a preferred embodiment of the novel laser processing system; 4 is a block diagram showing a laser beam of the preferred embodiment condensed to a focusing mirror; and FIG. 5 is a block diagram showing a photodetector of the preferred embodiment.

Referring to FIG. 3, a preferred embodiment of the laser processing system includes a laser source 1, an optical path module 2, a detection module 3, and a feed module 4 for use in a workpiece 5. The surface is laser processed.

The laser source 1 is used to generate a laser beam. In this example, the laser source 1 is placed horizontally, and the resulting laser beam is parallel to the workpiece 5.

The optical path module 2 is configured to guide the transmission path of the laser beam to the workpiece 5 so that the laser beam is perpendicular to the workpiece 5. The optical path module 2 includes a first total reflection mirror 21 and a second total reflection mirror. 22. A focusing mirror 23, a portion of the mirror 24, a light stop 25, and an acousto-optic modulator 26. The first and second total reflection mirrors 21, 22 are configured to receive and reflect the laser beam, and the first total reflection mirror 21 is disposed adjacent to the laser source 1, and the second total reflection mirror 22 is disposed adjacent to the workpiece 5. . The focusing mirror 23 is disposed above the workpiece 5 and receives the laser beam reflected from the second total reflection mirror 22, and condenses the laser beam into a high-energy beam to illuminate the surface of the workpiece 5. The partial mirror 24 is disposed between the first total reflection mirror 21 and the second total reflection mirror 22 for receiving the laser beam reflected from the first total reflection mirror 21 and reflecting most of the laser beam. And a small portion of the laser beam is transmitted through the partial mirror 24 to produce transmitted light associated with the laser beam. The light stop 25 is disposed adjacent to the second total reflection mirror 22 and configured to absorb the laser beam, so that the The laser beam does not converge to the focusing mirror 23. The acousto-optic modulator 26 is disposed between the partial mirror 24 and the second total reflection mirror 22 for receiving the laser beam reflected from the partial mirror 24 and electrically connected to the detecting module 3 A control signal is received, and the received laser beam is guided to the light stop 25 or the focusing mirror 23 according to the control signal.

The detection module 3 is configured to determine the power of the laser beam and adjust it, and includes a determination circuit 31, a laser control card 32, and a microprocessor 33. The determining circuit 31 has a photodetector 311 and a comparator 312.

Referring to FIG. 5, the photodetector 311 has a first stage operational amplifier circuit 313 and a second stage operational amplifier circuit 314. The first stage operational amplifier circuit 313 receives the transmitted light and converts the transmitted light into a current signal and outputs it. The second stage operational amplifier circuit 314 receives the current signal and converts the current signal into a voltage signal and outputs it.

Referring to FIG. 3, the comparator 312 internally stores a first threshold and a second threshold, and electrically connects the photodetector 311 to receive the voltage signal, and the voltage signal and the first threshold and the The second threshold is compared and a notification signal is output accordingly. The laser control card 32 is electrically connected to the comparator 312, the acousto-optic modulator 26 of the optical path module 2, and the laser source 1, and receives the notification signal, and generates the control signal according to the notification signal. The microprocessor 33 is electrically coupled to the laser control card 32 for setting the laser control card 32.

The feeding module 4 is used for holding the workpiece 5 and controlling the position of the workpiece 5 to be processed and the shape of the finished machining, that is, driving the workpiece 5, so that the workpiece The position to be processed of the piece 5 is moved to the focusing mirror 23 to receive the laser beam and perform laser processing.

When the processing is started, the laser source 1 emits the laser beam, and the laser beam is totally reflected by the first total reflection mirror 21 to the partial mirror 24, and most of the laser beam is completely covered by the partial mirror 24. Reflected to the acousto-optic modulator 26, a small portion of the laser beam passes through the partial mirror 24 to generate the transmitted light, and the photodetector 311 receives the transmitted light and converts the transmitted light into the voltage signal and outputs The comparator 312 receives the voltage signal and compares the voltage signal with the first threshold value and the second threshold value, and outputs the notification signal, and the laser control card 32 has the following two according to the notification signal. Kind of control status:

State one:

When the voltage signal is greater than the first threshold or less than the second threshold, that is, the power of the transmitted light is not within the normal range, and the voltage signal exceeds the first and second thresholds, the comparator 312 The logic level of the output of the notification signal is a first logic level. In this example, the first threshold is greater than the second threshold, and the first logic level is a high logic level. The laser control card 32 receives the notification signal and outputs the control signal to control the acousto-optic modulator 26 to cause the acousto-optic modulator 26 to direct the received laser beam to the light stop 25, and The laser beam is not concentrated. Then, the laser control card 32 outputs a trigger signal to the laser source 1, and triggers the laser source 1 to regenerate the laser beam.

State 2:

Referring to FIG. 4, when the voltage signal is less than the first threshold and is large When the second threshold is used, that is, the power of the transmitted light is within a normal range, so that the voltage signal does not exceed the first and second thresholds, the logic level of the notification signal output by the comparator 312 is A second logic level. In this example, the second logic level is a low logic level. The laser control card 32 receives the notification signal and outputs the control signal to control the acousto-optic modulator 26 to cause the acousto-optic modulator 26 to direct the received laser beam to the second total reflection mirror 22 Then, the laser beam is totally reflected to the focusing mirror 23 via the second total reflection mirror 22, and the focusing mirror 23 converges the laser beam to illuminate the surface of the workpiece 5 for subsequent laser processing.

In summary, the judging circuit 31 analyzes the transmitted light to determine whether the power level of the laser beam is within a normal range, and the notification output by the laser control card 32 according to the judging circuit 31. a signal to adjust whether the laser beam is to be concentrated to the focusing mirror 23 to ensure that the laser beam is processed within a normal power range to preserve the quality of the laser processing system during processing, so the present invention can be achieved The purpose.

However, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made in accordance with the scope of the present patent application and the contents of the patent specification, All remain within the scope of this new patent.

1‧‧‧Laser source

2‧‧‧Light path module

21‧‧‧First total reflection mirror

22‧‧‧second total reflection mirror

23‧‧‧ Focusing mirror

24‧‧‧Partial mirror

25‧‧‧Light Stopper

26‧‧‧Acousto-optic modulator

3‧‧‧Detection module

31‧‧‧Judgement circuit

311‧‧‧Photodetector

312‧‧‧ Comparator

32‧‧‧Laser Control Card

33‧‧‧Microprocessor

4‧‧‧Feed module

5‧‧‧Workpiece

Claims (13)

A laser processing system for a workpiece, comprising: a laser source for generating a laser beam; an optical path module for receiving the laser beam from the laser source and guiding the laser beam Passing a path and generating a transmitted light associated with the laser beam, and being controlled by a control signal to determine whether to converge the laser beam to illuminate the surface of the workpiece for processing; and a detecting module, electrical connection The optical path module further includes a determining circuit and receiving the transmitted light from the optical path module, and generating the control signal according to the power of the transmitted light; when the power of the transmitted light is not within a normal range, the control signal is controlled The optical path module does not converge the laser beam; when the power of the transmitted light is within a normal range, the control signal controls the optical path module to converge the laser beam to illuminate the surface of the workpiece for processing. The laser processing system of claim 1, wherein the determining circuit has: a photodetector, receiving the transmitted light, converting the transmitted light into a voltage signal and outputting, and a comparator electrically connecting the The photodetector receives the voltage signal, compares the voltage signal with a stored first threshold value and a second threshold value, and outputs a notification signal; when the voltage signal is greater than the first threshold value Or less than the second threshold, the logic level of the notification signal is a first logic level; When the voltage signal is less than the first threshold and greater than the second threshold, the logic level of the notification signal is a second logic level. The laser processing system of claim 2, wherein the detection module further comprises: a laser control card electrically connected to the comparator, the optical path module, and the laser source, and receiving the notification signal And generating the control signal according to the logic level of the notification signal; when the logic level of the notification signal is the first logic level, the control signal output by the laser control card controls the optical path module not to aggregate The laser beam; when the logic level of the notification signal is the second logic level, the control signal output by the laser control card controls the optical path module to converge the laser beam. The laser processing system of claim 3, wherein the first logic level is a high logic level and the second logic level is a low logic level. The laser processing system of claim 3, wherein when the control signal output by the laser control card controls the optical path module not to converge the laser beam, the laser control card outputs a trigger signal to the A laser source that triggers the laser source and regenerates the laser beam. The laser processing system of claim 1, wherein the optical path module comprises: a focusing mirror that receives the laser beam and condenses the laser beam to illuminate the workpiece; a portion of the mirror is disposed on the laser Between the source and the focusing mirror, Receiving and reflecting the laser beam and generating the transmitted light; a light stop for absorbing the laser beam so that the laser beam does not converge to the focusing mirror; an acousto-optic modulator disposed in the portion The mirror and the focusing mirror are configured to receive the laser beam, and are electrically connected to the detecting module for receiving the control signal, and according to the control signal, determining to receive the received laser beam to the stop light Or the focusing mirror. The laser processing system of claim 1, further comprising: a feed module for holding the workpiece and controlling the position to be processed and the finished shape of the workpiece. A detection module includes: a determination circuit, comprising: a photodetector, receiving a laser beam, converting the laser beam into a voltage signal and outputting, and a comparator electrically connecting the light detection Receiving the voltage signal, comparing the voltage signal with a stored first threshold value and a second threshold value, and outputting a notification signal; when the voltage signal is greater than the first threshold value or less than the a second threshold, the logic level of the notification signal is a first logic level; when the voltage signal is less than the first threshold and greater than the second threshold, the logic level of the notification signal is a second logic Level. The detection module of claim 8, further comprising: a laser control card electrically connecting the comparator and receiving the notification signal, and generating a control signal according to a logic level of the notification signal; when the logic level of the notification signal is the first logic level, The control signal outputted by the laser control card does not converge the laser beam; when the logic level of the notification signal is the second logic level, the control signal output by the laser control card controls the convergence of the laser beam. The detection module of claim 9, wherein the first logic level is a high logic level and the second logic level is a low logic level. The detection module of claim 9, wherein the laser control card outputs a trigger signal after the control signal output by the laser control card does not converge the laser beam. A judging circuit comprising: a photodetector that receives a laser beam and converts the laser beam into a voltage signal and outputs the same; and a comparator electrically connected to the photodetector to receive the voltage signal, and Comparing the voltage signal with a stored first threshold value and a second threshold value, and outputting a notification signal; when the voltage signal is greater than the first threshold value or less than the second threshold value, the output signal is output The logic level of the notification signal is a first logic level; when the voltage signal is less than the first threshold and greater than the second threshold, the logic level of the output signal is a second logic level . The determining circuit of claim 12, wherein the first logic level It is a high logic level, and the second logic level is a low logic level.