KR100611935B1 - Device for preventing from dazzling with detecting microwave - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave detection anti-glare device that detects electromagnetic waves generated with high illuminance light in a welding or cutting torch to protect an operator's eyes. Minimize the malfunction of the anti-glare device caused by the electromagnetic wave generated in the environment, and also prioritize the detection of light and electromagnetic waves so that the correct position can be checked and the work can be started during the work, and also according to the surrounding environment The present invention provides an electromagnetic wave detection anti-glare device to select whether or not to use the detection method.

Anti-glare device, resistance voltage divider, electromagnetic wave detection means start signal

Description

Electromagnetic wave detection glare prevention device {DEVICE FOR PREVENTING FROM DAZZLING WITH DETECTING MICROWAVE}

1 is a perspective view of a protective mask with a conventional anti-glare device

FIG. 2 is a view illustrating a user interface for adjusting shade, light detection sensitivity, and delay of a conventional anti-glare device.

3 is a block diagram showing an electromagnetic wave detection anti-glare device according to the present invention

Figure 4 is a circuit diagram of the electromagnetic wave detection means of the electromagnetic wave detection anti-glare device according to the present invention

5 is an exemplary view showing a user interface of the electromagnetic wave detection anti-glare device according to the present invention

6 to 9 are views showing screens displayed on the display means in the case of the first A mode, the first B mode, the first C mode, and the second mode, respectively.

10 is a flowchart illustrating the operation of the anti-glare device according to the present invention when the user selects the second mode.

(Explanation of symbols for the main parts of the drawing)

 1 .. Protective Mask 2 .. Anti-Glare

 3 .. Solar cell 4 .. Light sensing means

 5. Anti-glare plate 6. Shading control means

 7. Light detection sensitivity control means 8. Time delay adjustment means

 9. Power switch 10. Battery

11. Low voltage indicator 20. Optical detection means

30 .. Electromagnetic wave detection means 31 .. Electromagnetic wave detection means

32. Resonator 33. Electromagnetic wave detection means enable signal

34. Filter part 35. Voltage divider

36 .. Comparator 37 .. Comparator

38 .. Time constant 40 .. User interface

50. Control means 60. Light transmission control means

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave detection antiglare device, and more particularly, to an electromagnetic wave detection glare prevention device that stably protects an operator's eyes by detecting electromagnetic waves generated with high illumination light in a welding or cutting environment.

Conventionally, in order to control the transmittance of light generated from a welding or cutting torch, an anti-glare device which is worn on the head of an operator and uses optical detection means is used.

1 is a perspective view of a protective mask with a conventional anti-glare device.

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

That is, the light sensing means 4 such as a photodiode provided on the front portion of the anti-glare device 2 detects the light generated by the welding and cutting torch, and thus the control inherent in the anti-glare device 2. By darkly controlling the anti-glare plate 5 so that the circuit reduces the illuminance of the light passing through the anti-glare plate, the eyes of the worker wearing the protective mask 1 are protected.

FIG. 2 is a diagram illustrating a user interface for adjusting shade, light detection sensitivity, and time delay of the conventional anti-glare device 2.

Referring to FIG. 2, the user interface of the conventional anti-glare device 2 includes light blocking adjusting means 6, light detecting sensitivity adjusting means 7, and time delay adjusting means 8.

Light blocking adjusting means 6 is a means for adjusting the shade value of the anti-glare plate (5). The shading value is a value indicating the dark state of the anti-glare plate 5. By adjusting the shading value with the shading adjusting means 6, the light transmittance of the anti-glare plate 5 is adjusted.

The light detection sensitivity adjusting means 7 is a means for adjusting the light detection sensitivity of the anti-glare device 2. The light detection sensitivity is a numerical value representing the degree to which the control circuit of the anti-glare device 2 responds to the output signal of the light sensing means 4. The higher the light detection sensitivity, the better the response at low illumination.

The time delay adjusting means 8 is a means for adjusting the time delay of the anti-glare device 2. If the time delay is low, the control circuit of the anti-glare device 2 quickly switches the anti-glare plate 5 from a dark state to a bright state when the light detecting means 4 detects that the welding operation is completed. On the contrary, when the time delay is high, the transition from the dark state to the bright state takes more time.

Typically, in the anti-glare industry, the shading value is 5 to 13, the light detection sensitivity value is 0 to 10, and the time delay value is 0 to 10.

In addition, the user interface of the conventional anti-glare device 2 includes a power switch 9 for turning the power on and off, a battery 10 for supplying power, and a low voltage indicator 11 for indicating a low voltage state of the device.

However, when only the optical detection means is used as described above, malfunctions frequently occur due to the difference in detection signals and interference light that may occur depending on the type of the welding machine and the welding machine.

That is, when only the optical detection means is used, the light detection sensitivity is increased during low current welding, outdoor welding, and thin plate welding. At this time, the anti-glare plate 5 should be brightened in response to the interference light of the surroundings, but it is not darkened and is continuously dark. If there is a malfunction, such as gradually brightens even if brightened.

In order to prevent such a malfunction as described above, there is known an anti-glare device further comprising an electromagnetic wave detecting means.

The anti-glare device provided with the electromagnetic wave detection means is used for outdoor work directly exposed to sunlight, low current welding in which the illumination intensity of the welding light is not very high in preparation for ambient illumination, or illumination with high linearity and high illumination at the welding position. The light transmittance of the anti-glare plate may be usefully controlled through the electromagnetic wave detection method in an environment in which it is difficult to discriminate the welding light due to the high illumination of the surroundings to be welded, such as the use of the welding light.

However, since the conventional anti-glare device equipped with the electromagnetic wave detection means is set to use the electromagnetic wave detection method regardless of the working environment, rather than in an environment where a lot of electromagnetic waves are generated in the surrounding environment other than the welding or cutting torch of the operator Due to the electromagnetic waves generated in the surrounding environment, the light transmittance of the anti-glare plate was unnecessarily lowered during the work, which prevented the operator from working correctly.

In addition, since the anti-glare device having the conventional electromagnetic wave detection means has a fixed electromagnetic wave detection sensitivity, electromagnetic waves generated by other than worker welding or cutting machine, such as electromagnetic waves generated by devices of other workers nearby, It could be detected, and malfunctions due to this could not be avoided.

In addition, the conventional anti-glare device provided with the electromagnetic wave detection means, even if the work to be accurately identified and the position to be welded or cut until the work is started, so that the light detection means and the electromagnetic wave detection means to operate independently Since the electromagnetic wave is generated before the light at the welding or cutting machine when the power is applied to the welding or cutting machine or when the welding or cutting start switch is turned on, the light transmittance is lowered by the detected electromagnetic wave even though no light is generated. There was a problem that the operator is obstructed to check the correct welding or cutting site and work.

An object of the present invention for solving the above problems is to use only the optical detection means or the optical detection means and the electromagnetic wave detection means at the same time according to the conditions of the surrounding environment, efficient control is possible only by the optical detection means and electromagnetic wave detection On the contrary, an object of the present invention is to provide an anti-glare device which does not use the electromagnetic wave detection means in a situation that may cause a malfunction.

In addition, an object of the present invention for solving the above problems is to detect only electromagnetic waves generated by the user's welding or cutting machine using an electromagnetic wave sensor that is not significantly affected by the ambient light intensity or the welder current, and other surrounding environment The present invention provides an electromagnetic wave detection anti-glare device which minimizes a malfunction such as unnecessarily reducing the light transmittance during operation by providing an electromagnetic wave detection sensitivity adjusting means so as not to detect the electromagnetic wave generated in the.

In addition, an object of the present invention for solving the above problems is to prioritize the electromagnetic wave is detected only after a certain level of light starts to be detected in the welding or cutting of the operator, so that the light of the anti-glare plate before the light is detected The present invention provides an electromagnetic wave detection anti-glare device which prevents a phenomenon in which transmittance is reduced and enables a worker to perform a welding or cutting operation after confirming an accurate welding or cutting portion.

Electromagnetic wave detection anti-glare device according to an embodiment of the present invention for achieving the above object is an anti-glare device comprising an anti-glare plate for protecting the eyes of the operator from the light generated from the welding or cutting torch, the welding or Optical detection means for detecting light generated from the cutting torch; Electromagnetic wave sensing means for sensing electromagnetic waves generated by the welding or cutting torch; An electromagnetic wave detecting means for comparing the resonated signal inputted through the electromagnetic wave detecting means with a reference value that is variably set when the electromagnetic detecting means enable signal is applied; Control means for monitoring the change of the electromagnetic wave signal input from the output of the electromagnetic wave detecting means by applying the electromagnetic wave detecting means enable signal to the electromagnetic wave detecting means as light detection is started in the optical detecting means; And light transmission control means for controlling a change in the light transmittance of the anti-glare plate according to the output signal of the control means.

In addition, the electromagnetic wave detection anti-glare device according to the present invention, mode selection that can select any one of the first mode using only the optical detection means, and the second mode using both the optical detection means and the electromagnetic wave detection means. It further comprises a user interface comprising means and display means for displaying the selected mode.

In addition, the control means is preferably set to apply the electromagnetic wave detection enable signal only when the second mode is selected by the mode selection means.

The electromagnetic wave detecting means may include a resonator unit in which electromagnetic waves inputted through the electromagnetic wave detecting means are resonated; A filter unit for removing noise from an output of the resonator unit; A comparison unit for comparing the output of the filter unit with a reference value that is variably set when the electromagnetic wave detecting means enable signal is applied; And a time constant part for smoothing the output of the comparator as an input.

In addition, the comparison unit, the electromagnetic wave detection means enable signal is input to the power supply terminal, the output of the filter unit is input to the inverting input terminal, the electromagnetic wave detection means enable signal to the non-inverting input terminal includes at least one variable resistor. And a comparator to which the signal divided by the resistance divider is input.

In addition, the user interface further includes digital adjustment means for varying the resistance value of the variable resistor.

Moreover, it is preferable that the said display means also displays the electromagnetic wave detection sensitivity numerical value.

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

3 is a block diagram showing an electromagnetic wave detection anti-glare device according to the present invention, Figure 4 is a circuit diagram of the electromagnetic wave detection means 30 of the electromagnetic wave detection anti-glare device according to the present invention.

As shown in Figure 3, the electromagnetic wave detection anti-glare device according to the invention, the optical detection means 20, the electromagnetic wave detection means 30, the user interface 40, the control means 50 and the light transmission control means ( 60).

The optical detection means 20 is for detecting the light generated from the welding or cutting torch, and includes a filter and an amplifier. The optical detection means 20 compares the signal input from the light detection means 4 with the output of the solar cell 3 to determine the light. Detect the amount of change.

The electromagnetic wave detection means 30 is for detecting electromagnetic waves generated from the welding or cutting torch, and the signals inputted through the electromagnetic wave detection means 31 are resonated and filtered by the electromagnetic waves generated from the welding or cutting torch of the operator. The electromagnetic waves of a specific band are detected by comparison with the values.

In addition, the electromagnetic wave detecting means 30 preferably compares the output of the filter portion 34 with a reference value that is variably set when the electromagnetic wave detecting means enable signal 33 is applied, In the non-inverting input terminal, the power distributed by the resistor voltage divider 35 including at least one variable resistor whose variable value can be varied by a variable volume, a contact switch or a digital control means is inputted to variably set the reference value. Will be.

5 is an exemplary view showing a user interface 40 of the electromagnetic wave detection anti-glare device according to the present invention.

The user interface 40 is a means for mode selection and mode display, and adjustment of light shielding, light detection sensitivity, time delay and electromagnetic wave detection sensitivity.

Referring to FIG. 5, the user interface 40 includes a mode selection means 42, a display means 44, and a digital adjustment means 46.

The mode selecting means 42 makes it possible to select one of the first mode using only the optical detecting means 20 and the second mode using both the optical detecting means 20 and the electromagnetic wave detecting means 30.

The display means 44 displays the mode and the shading value, the light detection sensitivity value, the time delay value and the electromagnetic wave detection sensitivity value selected by the user on the LCD. In addition, the low voltage display is displayed in letters and shapes.

The digital adjustment means 46 is a means for allowing a user to adjust the shading value, the light detection sensitivity value, the time delay value and the electromagnetic wave detection sensitivity value.

Specifically, the digital adjustment means 46 may include a shading numerical value adjusting button part 461 for adjusting the shading value, a sensitivity numerical value adjusting button part 462 for adjusting the light detection sensitivity and an electromagnetic wave detection sensitivity, and a time delay value. Consists of adjustable time delay numerical adjustment button portion 463.

Each of the button parts 461 to 463 has a button for increasing the value and a button for decreasing the value, respectively, and widened the distance between the buttons for convenience of button operation.

In addition, the sensitivity value adjustment button unit 462 may adjust the light detection sensitivity value in the first mode, and adjust the electromagnetic wave detection sensitivity value in the second mode.

On the other hand, the first mode using only the optical detection means 20 is subdivided into three modes, 1A mode, 1B mode and 1C mode according to the type of welding operation.

6 to 9 are views showing screens displayed on the display means 44 in the case of the 1A mode, the 1B mode, the 1C mode, and the second mode, respectively.

Referring to FIG. 6, the first A mode is a mode when a welding machine is used, and when the user selects the first A mode by the mode selecting means 42, the display means 44 displays "WELD". In addition, in the case of the 1A mode, the range of the shading value that can be changed by the shading value adjustment button portion 461 is 9 to 13, and the range of the light detection sensitivity value that can be changed by the sensitivity value adjustment button portion 462 is obtained. The variable range is 0 to 10 and the time delay variable range that can be changed by the time delay numeric control button unit 463 is set to 0 to 10.

Referring to FIG. 7, the first B mode is a mode in which a cutting torch is used, and when the user selects the first B mode by the mode selecting means 42, the display means 44 displays " CUTTING " Is displayed. In the case of the first B mode, the range of the shading value that can be changed by the shading value adjustment button portion 461 is 5 to 8, and the variable range of the light detection sensitivity value that can be changed by the sensitivity value adjustment button portion 462. 0 to 10, the time delay variable range of the time delay that can be changed by the numeric adjustment button unit 463 is set to 0 to 10.

Referring to Fig. 8, the first C mode is a mode in which a grinder is used. When the user selects the first C mode by the mode selecting means 42, the display means 44 shows " GRIND " under the " CUTTING " The message “Protective eye wear” is displayed next to “GRIND”, that is, the message of wearing protective glasses. In the case of the 1C mode, the shading value of the anti-glare plate 5 is fixed to 4 irrespective of the signal output from the optical detection means 20.

Referring to FIG. 9, when the user selects the second mode, the display means 44 displays "X mode" under the "GRIND" display portion, and "Outdoor welding", "Low current welding" and " An information message "Electromagnetic wave Detector" is displayed. That is, when the outdoor welding, low current welding and electromagnetic wave detection, a guide message to convert to use the second mode is output.

In the case of the second mode, the variable range of the shading value that can be changed by the shading value adjusting button part 461 is 9 to 13, and the variable range of the electromagnetic wave detection sensitivity value that can be changed by the sensitivity value adjusting button part 462. 0 to 10, the variable time delay value that can be changed by the time delay value control button unit 463 is set to 0 to 10.

That is, when the second mode is selected, the light detection sensitivity cannot be adjusted by the digital adjusting means 46, and only the electromagnetic wave detection sensitivity can be adjusted.

The first A mode, the first B mode, the first C mode, and the second mode are sequentially changed each time the mode selecting means 42 is pressed.

Preferably, the control means 50 is a microcomputer or a control circuit including the same. When the first mode (1A mode to 1C mode) is selected by the mode selection means 42, the electromagnetic wave detection enable signal (33) is not applied so that the light transmittance of the anti-glare plate can be controlled only through light detection.

In addition, when the second mode is selected by the mode selection means 42, the control means 50 starts optical detection by the optical detection means 20, and the output is input to the control means 50. The electromagnetic wave detection means enable signal 33 is applied to the detection means 30 to determine its rank so as to start detecting the electromagnetic wave input through the electromagnetic wave detection means 31, and is input from the output of the optical detection means 20. The change of the light and the change of the electromagnetic wave input from the output of the electromagnetic wave detecting means 30 are monitored, and if the change does not occur, the operation is stopped until the change occurs.

The light transmission control means 60 is operated when the power applied from the solar cell 3 becomes a predetermined value or more, and the light of the anti-glare plate 5 according to the output signal of the control means 50. Control the transmittance.

Hereinafter, with reference to FIG. 4 again, the preferred embodiment of the electromagnetic wave detection means 30 of the anti-glare device according to the present invention.

As shown in FIG. 4, the electromagnetic wave detecting means 30 includes a resonator 32, a filter 34, a comparator 36, and a time constant 38.

The resonator 32 is switched by an electromagnetic wave applied to the base through the coil L1 of the electromagnetic wave sensing means 31, and an NPN transistor Q1 to which a power supply Vcc is applied to the collector through a resistor R1. It is composed of However, when the electromagnetic wave is detected through the coil L1, the voltage between the emitter and the 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. Will generate the corresponding output 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), It consists of a resistor (R3) (R4) connected in series across the capacitor (C2) (C4), and a capacitor (C3) connected to ground between the resistors (R3) and (R4), so that noise in the input signal Removed.

The comparison unit 36 inputs the electromagnetic wave detecting means enable signal 33 to a power supply terminal, an output of the filter unit 34 to an inverting input terminal (-), and an electromagnetic wave to a non-inverting input terminal (+). The detecting means enable signal 33 includes a comparator 37 to which a signal divided by a resistor voltage divider 35 including at least one variable resistor is input.

Since the electromagnetic wave detecting means enable signal 33 is input to the power supply terminal of the comparator 37, the comparator 37 operates only when the electromagnetic wave detecting means enable signal 33 is applied from the control means 50.

In addition, the output of the comparator 37 is fed back to the non-inverting input terminal (+) through a resistor (R9), the comparator 37 is a reference value and the inverting input terminal (-) set by the resistor voltage divider (35). Compare the input signal with.

The resistor voltage divider 35 is composed of two resistors R6 and R7, and the electromagnetic wave detecting means operating signal 33 applied to one end of the resistor R7 is distributed at a ratio determined according to the voltage division law, thereby resonating. A reference value for comparing the electromagnetic signal passing through the unit 32 and the filter unit 34 is set at the contacts of the two resistors R6 and R7.

In addition, at least one of the two resistors R6 and R7 constituting the resistor divider 35 is a variable resistor, and the voltage input to the non-inverting input terminal (+) can be variably determined by adjusting the variable resistor. Through this, the reference value of the comparator 36 can be set variably so that the operator can adjust the electromagnetic wave detection sensitivity. At this time, the size of the variable resistor is to be adjusted by the digital adjusting means 46. Of course, in addition to the digital adjustment means 46, a variable volume or a contact switch can be used.

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 operation and operation of the electromagnetic wave detection anti-glare device according to the present invention.

When the user selects the first mode by the mode selection means 42, the control means 50 does not apply the electromagnetic wave detection enable signal 33 to control the light transmittance of the anti-glare plate 5 only by light detection. You can do it.

An operation and action of the electromagnetic wave detection anti-glare device according to the present invention when the user selects the second mode will be described with reference to FIG. 10.

10 is a flowchart illustrating the operation of the anti-glare device according to the present invention when the user selects the second mode.

Referring to Fig. 10, when the change of the light generated in the welding or cutting torch is detected by the optical detecting means 20 (step S1) and the signal is input to the control means 50 (step S2), the control means ( The electromagnetic wave detecting means enable signal 33 is applied from the 50 to the electromagnetic wave detecting means 30 (step S3), and the electromagnetic wave detecting means 30 compares the electromagnetic signal input from the electromagnetic wave detecting means 31 with the set reference value. (Steps S10 to S40).

That is, the amount of change of electromagnetic waves generated by the welding or cutting torch is sensed by being applied to the coil L1 provided in the electromagnetic wave detecting means 31 (step S10). At this time, the impedance design of the electromagnetic wave sensing means 31 for the detection of the electromagnetic wave is preferably designed to be suitable for the effective electromagnetic wave to be detected in the welding environment, for example, 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 via R1), the effective signal of the electromagnetic wave is output by resonating by the transistor Q1 (step S20).

The effective signal of the electromagnetic wave output by resonating as described above passes through the filter unit 34 including the resistors R2, R3, R4, and capacitors C1, C2, C3, and C4 to remove noise. Only the signal of the AC component is output as a valid signal (step S30).

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 electromagnetic wave detecting means enable signal 33 is distributed by the resistance divider resistors R7 and R6 to the non-inverting input terminal + of the comparator 37 to be compared with the signal input from the filter unit 34. It becomes the reference value.

Accordingly, the comparator 37 compares the signal output through the filter unit 34 with the reference value input to the non-inverting input terminal (+), and outputs the compared signal (OUT). 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 signal is smoothed by an integrating circuit composed of the resistor R8 and the capacitor C5 of the time constant section 38 (step S50).

The signal smoothed as described above is inputted to the control means 50 and calculated to detect how much electromagnetic waves have been detected by the microcomputer or the control circuit including the microcomputer (step S60).

According to the result calculated in the operation (step S60), the control means 50 detects electromagnetic waves generated from the welding or cutting torch to change the light transmittance of the anti-glare plate 5, thereby generating in the environment of welding It is operated to detect and control the electromagnetic wave together with the light to protect the eyes of the worker more safely (step S70).

The drawings and description 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 claims or the 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.

Since the anti-glare device according to the present invention can select whether to use the electromagnetic wave detection means according to the surrounding environment, it is possible to efficiently control the optical detection means alone, and in the situation where the electromagnetic wave detection may cause a malfunction, without using the electromagnetic wave detection means, In the situation where it is difficult to effectively control the optical detection means alone, the electromagnetic wave detection means may be additionally used according to the user's selection, and thus, the anti-glare plate may be most efficiently operated according to the surrounding environment.

In addition, since the electromagnetic wave detection sensitivity can be adjusted when using the electromagnetic wave detection means, it is possible to minimize the detection of electromagnetic waves generated from the surrounding environment of the operator, thereby preventing malfunctions such as unnecessarily reducing the light transmittance during the operation. It has the advantage of enabling precise work.

In addition, the anti-glare device according to the present invention is configured to prioritize the electromagnetic wave is detected only after the light is detected, so that the light transmittance of the anti-glare plate is reduced immediately after the operation is started, that is, immediately after the light is generated, There is an advantage to be able to check and work correctly the welding or cutting part.

Claims (7)

delete Optical detection means for detecting light generated from a welding or cutting torch, electromagnetic wave detecting means for detecting electromagnetic waves, and an electromagnetic wave detecting means movable signal are applied, and a resonant signal input through the electromagnetic wave detecting means is variably set. The electromagnetic wave detection means compared with the reference value and the optical detection means starts applying the electromagnetic wave detection means activation signal to the electromagnetic wave detection means, and changes the electromagnetic signal input from the output of the electromagnetic wave detection means. Monitoring means for monitoring; And a light transmission control means for controlling a change in light transmittance of the anti-glare plate in accordance with an output signal of the control means. The optical detection means 20 selects a mode for selecting any one of a first mode using only optical detection means and a second mode using both the optical detection means 20 and the electromagnetic wave detection means 30. And means (42) and a display means (44) for displaying the selected mode. The method of claim 2, And said control means is configured to apply an electromagnetic wave detection enable signal only when the second mode is selected by said mode selection means. delete delete The method of claim 2, wherein the user interface, And electromagnetic control means for varying the resistance of the variable resistor. The method of claim 6, wherein the display means, An electromagnetic wave detection anti-glare device, which also displays an electromagnetic wave detection sensitivity value.

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