KR20000043613A - Apparatus and method for preventing dazzling by means of frequency detection - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency detecting anti-glare device and a method for detecting an electromagnetic wave generated together with high illuminance light in a welding or cutting torch to protect an operator's eyes. An anti-glare device comprising an anti-glare plate for protecting a light source, the anti-glare device comprising: detection means for inputting electromagnetic waves generated by the welding or cutting torch through detection means for detecting the electromagnetic waves, and thus resonating and comparing with a set value; Control means for monitoring a change in a frequency signal input from an output of said detecting means; And light transmission control means for controlling the light transmittance conversion of the anti-glare plate according to the output signal of the control means, whereby the amount of change in the wavelength or illuminance of the input light in the welding or cutting torch becomes less than an appropriate amount per unit time. It is possible to prevent the malfunction of temporarily stopping light blocking, and to operate the anti-glare device irrespective of the type of welding and the type of the welding machine, and the continuous generation generated by electromotive force induced by the transformer in welding using a non-optical detection method. There is an advantage that the light blocking phenomenon is prevented.

Description

Frequency detection glare prevention device and method

The present invention relates to a frequency detecting anti-glare device, and more particularly, to a frequency detecting anti-glare device and a method for stably protecting an operator's eyes by detecting a frequency generated with high illumination light in a welding environment.

In general, anti-glare devices are used to protect the operator's eyes from the high roughness generated in welding and cutting torches. In the anti-glare device, light beams of 780 nm (IR) or more and less than 365 nm (UV) are filtered, and only light in the visible region is darkened.

The prior art uses an anti-glare device worn on the head of the operator to adjust the light generated from the welding or cutting torch, the anti-glare device blocks the high illumination light generated from the welding or cutting torch, and thus And a control circuit including a microcomputer for controlling the light transmittance of the anti-glare plate.

However, the above-described anti-glare device according to the prior art uses an optical sensor to detect welding light, so that when the amount of change in wavelength or illuminance of the input light becomes less than an appropriate amount per unit time, the signal cannot be detected. There is a problem that the welding light is directly applied to the eyes of the worker because the anti-glare device is malfunctioning during the welding to temporarily stop the light blocking.

In addition, when detecting a welding signal using only the optical sensor, there is a problem that the anti-glare device may malfunction because the detected signal is different according to the type of welding and the type of the welding machine.

In addition, an anti-glare device using a conventional non-optical detection method using electromotive force induced by a transformer is an unintended malfunction caused by the noise magnetic field when a magnetic field caused by noise is applied from the surrounding environment regardless of the welding operation. Since the continuous light blocking phenomenon occurs in the anti-glare device, the welding light can not be identified by the operator's eyes due to the light blocking phenomenon of the anti-glare device, there was a problem that can not confirm the welding work state.

Therefore, an object of the present invention for solving the above problems is to detect the electromagnetic waves generated with the high illumination light generated in the welding or cutting torch, and accordingly by changing the light transmittance of the anti-glare plate operator more stable The present invention provides a frequency detection anti-glare device and a method for protecting the eyes of the eye.

1 is a perspective view of a protective mask having an anti-glare device.

2 is a block diagram showing a frequency detection anti-glare device according to the present invention.

3 is a frequency detection circuit diagram of the anti-glare device according to the present invention.

4 is a flowchart illustrating a frequency detection method of the anti-glare device of FIG. 3.

<Description of the symbols for the main parts of the drawings>

1 .. Protective Mask 2 .. Anti-Glare

3 .. Solar cell 4 .. Optical sensor

5 .. Anti-glare plate 6 .. Antenna

14 .. Optical signal detector 16. RF signal detector

20. Control part 22. Light transmission control part

32. Resonator 34. Filter

36 .. Comparator 37 .. Comparator

38 .. City Constants

In order to achieve the above object, the frequency detecting anti-glare device of the present invention is an anti-glare device for protecting an operator's eyes from light generated by a welding or cutting torch, in the welding or cutting torch Detecting means for generating the generated electromagnetic waves through the detecting means for detecting the electromagnetic waves, thereby resonating and comparing the set values; Control means for monitoring a change in a frequency signal input from an output of said detecting means; And light transmission control means for controlling the light transmittance conversion of the anti-glare plate according to the output signal of the control means.

In order to achieve the above object, the frequency detection method of the anti-glare device of the present invention, the anti-glare device comprising an anti-glare plate for protecting the operator's eyes from the light generated by the welding or cutting torch, the welding or cutting The electromagnetic wave generated in the torch is inputted through the sensing element for detecting the electromagnetic wave to be resonated and compared with a set value; Calculating a control signal according to the compared signal as an input; And converting the light transmittance of the anti-glare plate according to the calculated result.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a perspective view of a protective mask having an anti-glare device.

As shown in the drawing, the protective mask 1 having the anti-glare device 2 provided on the front portion is an anti-glare plate 5 which is a liquid crystal display (LCD) included in the anti-glare device 2. Through to reduce the illuminance of the light having a high illuminance applied to the eyes of the operator.

That is, the light sensor 4 provided in the front portion of the anti-glare device 2 detects the light generated by the welding and cutting torch, and thus the light through which the control circuit embedded in the anti-glare device 2 passes. By darkly controlling the anti-glare plate 5 so as to be small, the eyes of the worker wearing the protective mask 1 are protected.

2 is a block diagram showing a frequency detection anti-glare device according to the present invention.

As shown, the frequency detecting anti-glare device according to the present invention includes a detecting means, a control means and a light transmitting means.

The detecting means is for detecting electromagnetic waves generated by the welding or cutting torch, and the RF signal is detected by resonating and detecting the electromagnetic waves through the antenna 6 which is a sensing means. to be.

The RF signal detector 16 is a circuit for receiving a frequency of a specific band from the signal of the electromagnetic wave applied to the antenna 5.

The control means is a control unit 20 which monitors the change in the frequency input from the output of the detection means and performs the calculation accordingly, preferably a micom or a control circuit including the same.

In addition, the optical signal detector 14 is a circuit including an optical sensor 4 for detecting light generated by the welding or cutting torch.

The optical signal detector 14 includes a filter and an amplifier to detect an optical signal that becomes a valid wavelength band from a signal input from the optical sensor 4.

3 is a frequency detection circuit diagram of the anti-glare device according to the present invention.

As shown, the RF signal detector 16 includes a resonator 32, a filter 34, a comparator 36 and a time constant 38.

The resonator 32 is switched by a frequency applied to the base through the coil L1 of the antenna 6, which is a sensing means, and an NPN transistor having a power supply Vcc applied to the collector through a resistor R1 ( Q1). However, when the electromagnetic wave is detected through the coil L1, the voltage between the emitter base of the transistor Q1 of the resonator unit 32 and the electromagnetic wave signal are resonated with each other by the electromagnetic wave signal applied to the base, whereby the transistor Q1 In operation, the output is generated through the collector.

The filter unit 34 includes a resistor R2 connected to ground between a capacitor C1 (C2) (C4) and a capacitor (C2) (C4) connected in series with the collector output of the transistor (Q1), Consists of a resistor (R3) (R4) connected in series across the capacitor (C2) (C4), and a capacitor (C3) connected to the ground between the resistor (R3) (R4), so that noise in the input signal Removed.

The comparison unit 36 has an output of the filter unit 34 is input to the inverting input terminal (-), the power supply (Vcc) is distributed by the resistor (R7) (R6) is input to the non-inverting input terminal (+) The output is composed of a comparator 37 which is fed back to the non-inverting input terminal (+) through a resistor (R9) to input a value set by the resistor (R7) (R6) and a signal input to the inverting input terminal (-). Compare.

The time constant 38 is configured such that the power supply Vcc is grounded through the resistor R8 and the capacitor C5, and the output of the comparator 36 is connected between the resistor R8 and the capacitor C5 and output. Smooth the signal OUT.

Hereinafter, the frequency detecting anti-glare device of the present invention configured as described above will be described with reference to a flowchart of the frequency detection method of the anti-glare device of FIG. 4.

First, in an anti-glare device including an anti-glare plate for protecting an operator's eyes from light generated by a welding or cutting torch, the electromagnetic wave 6 generated by the welding or cutting torch is a sensing element for detecting electromagnetic waves (6). It is input through and resonated, and compared with the set value (40 to 48).

That is, the amount of change of electromagnetic waves generated by the welding or cutting torch is detected by being applied to the coil L1 provided in the antenna 6 (40). At this time, the impedance design of the antenna 6 for the detection of electromagnetic waves is preferably designed to be suitable for the effective frequency to be detected in the welding environment, for example, in the range of 2KHz to 400KHz.

The transistor Q1 of the resonator 32 to which the electromagnetic wave is changed as the base is repeatedly turned on and off depending on the potential of the base, and thus the resistance ( In the collector to which the power source Vcc is applied through R1), the effective signal of the electromagnetic wave is output by resonating by the transistor Q1 (42).

The effective signal of the electromagnetic wave output by the resonance passes through the filter unit 34 including the resistors R2, R3, R4, and capacitors C1, C2, C3, and C4. Only the signal of the component is output 44 as a valid signal.

The signal from which the noise is removed from the filter unit 34 is input to the inverting input terminal (-) of the comparator 37 constituting the comparator 36. At this time, the non-inverting input terminal (+) of the comparator 37 is supplied by being distributed and input by the resistors R7 and R6 to which the power supply Vcc is set to become a comparison reference signal of the signal input from the filter unit 34. Accordingly, the comparator 37 compares the detection signal output through the filter unit 34 with the reference signal input to the non-inverting input terminal (+), and outputs the compared signal (OUT) (46). In addition, the comparator 37 has a hysteresis characteristic due to the resistor R9 connected to the output and the input of the comparator 37, so that the output voltage of the comparator 37 passes through the resistor R9 to the non-inverting input terminal (+). Because it increases the potential of, it operates less sensitively to the noise signal input to the inverting input terminal (-).

The output OUT signal is smoothed by an integrating circuit composed of a resistor R8 and a capacitor C5 of the time constant section 38 (48).

The smoothed signal as described above is input to the controller 20 and calculated to detect how much frequency is detected by the control circuit including the microcomputer or the microcomputer (50).

According to the result calculated in the operation 50, the control unit 20 detects the electromagnetic wave generated from the welding or cutting torch to convert the light transmittance of the anti-glare plate 5, and thus In operation 52, the electromagnetic wave is detected and controlled to protect the eyes of the worker more safely.

The drawings and specification are merely exemplary of the invention, which are used for the purpose of illustrating the invention only and are not intended to limit the scope of the invention as defined in the appended claims or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the present invention, when the amount of change in the wavelength or illuminance of the input light becomes less than an appropriate amount per unit time in a welding or cutting torch using an optical sensor, there is an advantage that a malfunction of the anti-glare device that temporarily stops light blocking is prevented.

In addition, since the welding signal is detected using the optical sensor and the antenna at the same time, there is an advantage that the anti-glare device can be operated regardless of the type of welding and the type of the welding machine.

In addition, when working in a welding environment using a non-optical detection method based on the principle of electromotive force in the transformer (trans), there is an advantage that the continuous light blocking phenomenon caused by the electromotive force is prevented.

Claims (6)

An anti-glare device comprising an anti-glare plate for protecting an operator's eyes from light generated by a welding or cutting torch, Detection means for inputting electromagnetic waves generated by the welding or cutting torch through the sensing means for sensing the electromagnetic waves, and thus resonating and comparing with a set value; Control means for monitoring a change in a frequency signal input from an output of said detecting means; And And a light transmission control means for controlling the light transmittance conversion of the anti-glare plate according to the output signal of the control means. The method of claim 1, wherein the detecting means, A resonator 32 in which electromagnetic waves input through the sensing means resonate; A filter unit 34 for removing noise from an output of the resonator unit 32; A comparison unit 36 for comparing the output of the filter unit 34 with a set value; And And a time constant unit (38) for smoothing the output of the comparing unit (36) as an input. An anti-glare device comprising an anti-glare plate for protecting an operator's eyes from light generated by a welding or cutting torch, The electromagnetic wave generated by the welding or cutting torch is input through the sensing element for detecting the electromagnetic wave to be resonated, and compared with a set value; Calculating a control signal according to the compared signal as an input; And converting the light transmittance of the anti-glare plate according to the calculated result. The method of claim 3, wherein the comparing step, Detecting an amount of change in electromagnetic waves applied to the sensing element for detecting electromagnetic waves; Resonating the detected signal with the amount of change; Removing noise from the resonated signal; Comparing the noise canceled signal with a set value; And And a step of smoothing the compared signal. The method of claim 4, wherein the resonating step comprises: And the input signal is resonated by a resonant circuit including a transistor. The method of claim 4, wherein the comparing step, And a comparator for comparing the input signal with a set value, wherein the comparator uses hysteresis characteristics.