KR101673242B1

KR101673242B1 - Mask for Weldingk

Info

Publication number: KR101673242B1
Application number: KR1020150097084A
Authority: KR
Inventors: 김백섭
Original assignee: 한림대학교 산학협력단
Priority date: 2015-07-08
Filing date: 2015-07-08
Publication date: 2016-11-07

Abstract

The present invention provides an electric welding mask, which protects eyes of a worker by providing image data photographed through a photographing device such that the worker is not directly in contact with a welding arc, and improves wearing comfort of the worker by arranging a light-shielding liquid crystal only on a front surface of the photographing device and simply configuring the mask. To this end, the electric welding mask comprises: a mask main body including at least one photographing device arranged on a front surface thereof, a light-shielding liquid crystal arranged next to the photographing device, and a display device arranged on a rear surface thereof; and an arc image control unit for filtering arc image data with respect to a welding arc in an image photographed by the photographing device, and displaying the arc image data on the display device so as to prevent the eyes of the worker from being directly exposed to the welding arc. The arc image control unit is capable of equalizing the brightness of images obtained before the welding arc is generated and after the welding arc is generated.

Description

[0002] Mask for Weldingk [0003]

The present invention relates to a welding mask, and more particularly, to an electronic welding mask for protecting a worker by solving the problem of a response speed delay which is a disadvantage of a conventional optical welding mask and by blocking a welding flame instantaneously applied to an operator .

Welding masks used to protect workers from welding arcs that occur during welding operations use a method of weakening the welding arc reaching the operator by mounting brown glass on the front side. Welding arc is harmful to the operator's eyes because it includes intense visible rays and ultraviolet ray around 380 nm, and the worker tends to avoid welding arc, which may cause safety accidents during work. In addition, the conventional optical welding mask protects the operator's eyes by lowering the light transmittance, which means that the operator is prevented from recognizing the surrounding objects.

On the other hand, Patent No. 10-0254713 discloses a light transmission control device and a liquid crystal assembly including an optical filter, a sensor, an optical band filter, a light transmission control device, a welding helmet using the same, A protective device has been proposed.

Patent No. 10-0254713 discloses a technique for limiting the welding arc directed toward the operator's eye by increasing or decreasing the transmittance of the liquid crystal disposed on the front surface of the welding helmet when a welding arc is detected using a sensor provided on the outer periphery of the welding helmet, The liquid crystal is in a transparent state. When the welding arc is detected, the transmittance of the liquid crystal is lowered according to the intensity, and the transparency of the welding arc is lowered to protect the operator's eyes.

In addition, Japanese Patent No. 10-193935 proposes a welding mask which improves the difficulty in confirming the workpiece by the light shielding glass of the welding mask just before the welding operation, and displays the image captured by the camera on the display device before the welding operation have. Japanese Patent Laid-Open No. 10-1179354 discloses a technique in which a worker grasps a workpiece using an image picked up by a camera immediately before a welding operation and grasps a welding object using light transmitted through a light- .

However, since the method of increasing or decreasing the transmittance of the liquid crystal by controlling the liquid crystal after the welding arc is detected in the sensor, the patent 10-0254713 has a limitation in completely blocking the welding arc projected to the operator immediately after the welding arc occurs . An electronic welding mask that detects the welding arc and increases or decreases the transmittance of the liquid crystal according to the intensity of the detected welding arc may be exposed to an intense welding arc by the operator during the detection delay time of the sensor.

Even when the exposure time to the welding arc is extremely short, the impact on the operator's eye is not small and when the impact accumulates, the operator's eyes may not be fully protected.

In addition, the patent document No. 10-1179354 is similar to the conventional welding mask in that the welding operation is performed using the light shielding glass, and the image data acquired by using the camera is turned off at the same time that the welding operation is started do. This means that the image data obtained by the camera stops the function at the same time that the welding operation is started, which means that the bright light of the welding arc observes the reflection from the workpiece with the light shielding glass. Since the intensity of the light transmitted to the operator differs between before and after the welding operation, the semi-electronic welding mask is used for the workpiece viewed through the light-shielding glass during the welding operation, The object may be discriminated and the discrimination may be deteriorated.

It is an object of the present invention to solve at least one of the above problems of the prior art.

It is another object of the present invention to solve the problem that the welding arc is not directly transmitted to the operator so that the operator is not exposed to the welding arc and the optical welding mask gives the operator a dark and low vision, And it is an object of the present invention to provide an electronic welding mask that minimizes the weight of the liquid crystal provided in the mask so that the operator can easily wear and use the mask.

According to an embodiment of the present invention, there is provided an image pickup apparatus including a mask body having at least one image pickup element disposed on a front surface thereof, a light shielding liquid crystal disposed adjacent to the image pickup element, And an arc image control unit for filtering the arc image data for the welding arc and displaying the arc image data on the display device so as to block the operator's eyes from being directly exposed to the welding arc, Is achieved by an electronic welding mask which equalizes the image brightness after the occurrence of the incident light.

According to the present invention,

Since the operator can not directly touch the welding arc, the operator's eyes can be protected. Unlike the optical welding mask using brown glass, the image of the work can be seen through the clean image, The work safety is improved and the size of the light shielding liquid crystal becomes small enough to correspond to the size of the image pickup device, so that the weight due to the liquid crystal can be reduced and the wearer's comfort can be improved.

1 shows a front view of an electronic welding mask according to an embodiment of the invention.
Fig. 2 shows a rear view of the electronic welding mask shown in Fig.
Fig. 3 shows a side view of the electronic welding mask shown in Fig.
4 is a cross-sectional view for explaining the arrangement relationship between the sensor and the image pickup device along the direction A-A 'in Fig.
Fig. 5 shows a conceptual diagram of the control logic of an electronic welding mask according to an embodiment.

The welding arc referred to herein may refer to a spark or spark spark that occurs when welding a metal using a welder.

The light-shielding liquid crystal referred to in this specification can refer to the increase or decrease of the light transmittance by a control signal applied from the outside. The light shielding liquid crystal may be the same as applied to a conventional electronic welding mask.

The image data referred to in this specification may refer to image data captured by the image pickup device and the arc image data may specifically refer to an image corresponding to the wavelength band of the welding arc among the image data. For example,

Image data including a wavelength band of 300 nm to 400 nm,

- image data with excessively high luminance and

- It can refer to one of the image data corresponding to the video segment whose luminance value surges from the previous value.

As used herein, the term " rear surface "may refer to a surface facing the user's face when the user wears the electronic welding mask according to the embodiment.

Thus, "front side " as referred to herein may refer to an external side that does not face the user's face when the user wears the electronic welding mask according to the embodiment. In this case, the "front surface" may correspond to the exposed surface exposed to the outside as viewed from the user ' s face, and may be in contact with the welding arc.

The display devices herein may be one, two, or more. When the display device is conceptually described, only reference numeral "150" is assigned. However, when there are a plurality of display devices and a separate explanation is required, reference numerals for the display device are divided into 151, 152 and 153 .

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 shows a front view of an electronic welding mask according to an embodiment of the present invention, Fig. 2 shows a rear view of the electronic welding mask shown in Fig. 1, Fig. 3 shows an electronic welding mask Fig.

1 to 3, an electronic welding mask 100 according to an embodiment includes a mask body 110, an imaging element 120, a protective cover 130, a mask body 110 covering a face of an operator, A rotating shaft 140, a display device 150 and an arc sensor 160. The mask body 110 may include a top cover 111 and a bottom cover 112. [

The mask body 110 may be formed of a light metal material such as plastic, aluminum, or duralumin, and may be mounted on the operator's face to protect the operator's face.

The mask body 110 is mounted on the face of the user and its shape can be determined along the face shape of the user. For example, the mask body 110 should be formed so that the nose portion protrudes when worn by a user, and the display device 150 may be disposed on the rear surface of the mask body 110 facing the user's face. The display device 150 may be formed as a rectangle indicated by a dotted line in FIG. 2 to provide a large and uniform image data to the user, or a pair of display devices 151 and 152, And may be disposed on the rear surface of the main body 110 to provide images to the left and right eyes of the user, respectively. In this case, the image data provided to the user may be provided in the form of a three-dimensional stereoscopic image with a parallax with respect to the time when the left eye and the right eye of the user are provided.

A pair of image pickup devices 120 may be disposed on the front surface of the mask body 110. The imaging device may be a CCD (Charge Coupled Device) device or a CMOS device, and may be combined with a lens for securing an imaging angle and zooming. Further, a shielding liquid crystal may be attached to the image pickup device 120. [ The light blocking liquid crystal is a liquid crystal in which the light transmittance is increased or decreased according to an electric signal, and the intensity of external light applied to the image capturing device 120 is increased or decreased. Preferably, the light blocking liquid crystal may be used to reduce the intensity of the welding arc and transfer it to the imaging element 120.

Here, the size of the light shielding liquid crystal can be determined according to the area of the image pickup device 120, and it can be seen that the size of the light shielding liquid crystal is very small as compared with that of the conventional light shielding liquid crystal. The area of the light shielding liquid crystal may be 100% to 150% of the area of the image sensing device 120, and the area of the light shielding liquid crystal may decrease according to the area ratio, and the weight may decrease accordingly. Accordingly, the weight of the electronic welding mask 100 according to the embodiment is similar to the weight of the light shielding liquid crystal, and the weight of the electronic welding mask 100 is reduced, and when the operator wears it, Can be improved. However, the conventional electronic welding mask in which the light shielding liquid crystal is disposed on the front face of the mask body has no theoretical point in that the feeling of wearing is reduced by the weight of the light shielding liquid crystal.

Meanwhile, the mask body 110 can expose part of the face of the operator to the outside according to the needs of the operator. The mask body 110 is composed of a top cover 111 and a bottom cover 112. The bottom cover 112 is rotated in the direction D0 around the rotation axis 140 so that the lower part of the face of the operator can be exposed to the outside have. Likewise, the top cover 111 may also be rotated in the direction D1 about the rotary shaft 140 so that the top of the operator's face may be exposed to the outside.

A pair of display devices 150 may be provided on the rear surface of the mask body 110, that is, the surface facing the operator's face. The electronic mask 100 according to the embodiment protects the operator's eyes by a method of picking up a front surface of the mask body 110 by the imaging element 120 and displaying the picked-up image on the display device 150. [

The conventional electronic mask protects the operator's eyes by increasing or decreasing the light transmittance of the liquid crystal depending on the intensity of the welding arc detected by the sensor,

The electronic mask according to the embodiment may be configured such that in the image captured by the image pickup device 120, the operator filters the arc image data on the welding arc generated during the welding operation and reproduces the filtered image on the display device 150 Difference.

Here, the arc image data

1) image data of a wavelength range of a welding arc, for example, a wavelength range of 300 nm to 400 nm,

2) the image data of the section where the luminance rises rapidly or the image data whose luminance is equal to or higher than the reference value.

The electronic welding mask according to the embodiment differs from the conventional method of adjusting the light transmittance of the welding arc directed to the operator's eye according to the intensity of the welding arc measured by the sensor,

The welding arc is differentiated in that it can not be directly irradiated towards the operator's eye. The welding arc and the surrounding image are imaged and displayed on the display device 150 adjacent to the operator's eye and the welding arc is filtered before display on the display device 150 and the brightness can be corrected. In other words, the electronic mask 100 according to the embodiment filters the arc image data of the welding arc in the image captured by the image pickup device 120 so that the welding arc is indirectly transferred without being directly transmitted to the operator's eye. have.

The electronic welding mask according to the embodiment provides the operator with an image captured by the imaging element 120 only until the welding operation is completed before the welding operation is started. Therefore, before the welding work, the image signal should be controlled so that the image of the object to be worked as well as the surrounding environment can be seen easily by the operator,

During the welding operation, it is necessary to control the image signal so that the operator can identify both the surrounding environment and the welding arc by lowering the luminance of the welding arc. Accordingly, in the electronic welding mask according to the embodiment,

3) The luminance of the video signal is adjusted so that the luminance value is uniform before the welding arc occurs and after the welding arc occurs,

4) After filtering the arc image data, it can be equalized with the image value (for example, luminance value) before the welding arc occurs.

3, in the electronic welding mask according to the embodiment, the top cover 111 and the bottom cover 112 can be moved in the directions D1 and D2, respectively. 3, an opening S1 may be formed between the top cover 111 and the bottom cover 112 as the top cover 111 and the bottom cover 112 move in the directions D1 and D2, respectively, At this time, the user may expose a part of the face, for example, the eyes and nose of the face to the outside of the mask body 110 through the opening S1. The user can open the opening to observe the workpiece in detail, or open the opening for ventilation to the face. At this time, the top cover 111 and the bottom cover 112 can rotate in the directions of D1 and D2, respectively, about the rotation axis 140 to form the opening S1. The rotation axis 140 includes a screw The head is exposed in the mask body 110 and the shaft can be fixed through the top cover 111 and the bottom cover 112.

4 is a cross-sectional view for explaining the arrangement relationship between the sensor and the image pickup device along the direction A-A 'in Fig.

4, the electromagnetic welding mask 100 according to the embodiment includes a light shielding glass 171 disposed on the outer circumference of the mask body 100 and an arc sensor 160 disposed inside the light shielding glass 171 . The arc sensor 160 is an optical sensor that, when exposed to a welding arc, can detect the light wavelength or luminance value of the welding arc.

Unlike the light shielding liquid crystal, the light shielding glass 171 does not change the light transmittance by an external control signal and corresponds to what is commonly called a brown glass attached to a welding mask. The light shielding glass 171 is used to lower the light intensity of the welding arc to the arc sensor 160 and may be provided to prevent the arc sensor 160 from being damaged due to an excessively high luminance of the welding arc.

The imaging device 120 is embedded in the mask body 110 and can capture the front direction of the mask body 110. At this time, the blocking liquid crystal 181 may be disposed on the image pickup surface of the image pickup device 120, and the blocking liquid crystal 181 may be controlled by the arc image control unit to be described later to increase or decrease the light transmittance.

The blocking liquid crystal 181 applied to the present embodiment reduces the brightness of the welding arc applied to the image pickup device 120 to protect the image pickup device 120 and protects the image 120 for the arc image data of strong luminance It is possible to reduce the burden and time required for the processing.

However, if the welding operation is continued, the light transmittance is lowered and the brightness of the image data applied to the image pickup device 120 can be lowered .

In the electromagnetic welding mask according to the embodiment, the blocking liquid crystal 181 is provided to reduce the time and resources required for the image processing, and it is possible to directly control the light transmittance of the welding arc directed from the conventional electronic mask to the operator's eyes . This is because the electronic welding mask 100 according to the embodiment is distinguished from the conventional electronic welding mask in that the light shielding liquid crystal of the conventional electronic welding mask 100 is exposed to the welding arc for a short time Since the image data processed from the beginning is reproduced in the display device 150, unlike the case in which the user's eyes are exposed to a welding arc having a strong luminance, the user is discriminated in that it is not directly exposed to a welding arc having a strong luminance Feature.

Fig. 5 shows a conceptual diagram of the control logic of an electronic welding mask according to an embodiment.

5 will be described with reference to Figs. 1 to 4. Fig.

5, the control logic of the electronic welding mask 100 according to the embodiment includes an arc sensor 160, a light blocking liquid crystal 181, an image pickup device 120, an arc image control unit 191, an image processing unit 192 And a display device 150. [0033]

One or more of the arc sensors 160 may be disposed on the front surface of the mask body 110. When a user performs a welding operation, the arc sensor 160 detects a welding arc occurring in the welding object and transmits the welding arc to the arc image control unit 191 . In addition, the arc sensor 160 may detect the ultraviolet wavelength band generated in the welding arc. For example, the arc sensor 160 may detect ultraviolet rays in the 300 nm to 400 nm band.

The arc image control unit 191 is connected to the arc sensor 160, the light shielding liquid crystal 181 and the image sensor 120. The arc image controller 191 filters the arc image data from the image data captured and provided from the image sensor 120, And may transmit the image data to the image processing unit 192. At this time, the arc image control unit 191 may filter the arc image data according to the following calls.

1) The image data of a predetermined reference luminance or more is lowered to the reference luminance to filter the arc image data.

2) Image data at the time when ultraviolet rays (300 nm to 400 nm) are generated through the arc sensor 160 are converted into reference images according to reference brightness.

At this time, the reference luminance may be 0.5 cd / cm 2, but the reference luminance may be lower or higher. However, it is not limited.

3) When the luminance value is rapidly changed in the image data, it is recognized as the arc image data, and the sequential filtering can be performed in which the luminance values are sequentially increased so that the user does not feel the sudden change in luminance.

For example, when the luminance of image data is rapidly changed to 0.4 cd / cm 2 at a certain time in the state of 0.2 cd / cm 2, the luminance value of the image data is changed from 0.2 -> 0.4 to 0.2 -> 0.3 -> 0.4 So that the user is not affected by visual shock or shock due to a rapid change in luminance.

The arc image control unit 191 may control the light shielding liquid crystal 181 according to the luminance value measured from the arc sensor 160 to increase or decrease the light transmittance of the light shielding liquid crystal 181.

When the arc sensor 160 detects a luminance value equal to or higher than a reference luminance (for example, 0.5 cd / cm 2), the arc image control unit 191 controls the arc image sensor 181 in accordance with the luminance value detected by the arc sensor 160 The light transmittance is controlled to be increased or decreased to equalize the luminance value of the welding arc transmitted to the image pickup device 120 thereafter. Direct exposure of the image pickup device 120 to a strong luminance can affect the lifetime and reliability of the image pickup device 120 and the luminance of the image data transmitted from the image pickup device 120 also fluctuates greatly, The image processing burden of the image processing unit 191 can also be increased. Accordingly, the arc image controller 191 can adjust the light transmittance of the light blocking liquid crystal 181 according to the detection result of the arc sensor 160, thereby equalizing the brightness of the image data.

The image data obtained by filtering the arc image data in the arc image control unit 191 is then supplied to the image processing unit 192. The image processing unit 192 divides the image into one or more images according to the display device 150, Device 150 as shown in FIG.

The arc image controller 191 refers to the luminance value detected by the arc sensor 160 and calculates the luminance value of the image data before the arc image is generated and the luminance value of the image data before the arc image is detected The luminance values of the sensed image data can be compared and the both can be made uniform.

Before the arc image is generated, it may mean a time at which the operator observes the surrounding environment and the workpiece through the display device 150 before the worker performs the welding operation.

When the time of observing the workpiece and the brightness of the image data after the occurrence of the welding arc are largely different from each other, the worker may be difficult to identify the workpiece by the image data differentiated before and after the welding operation, . In contrast, the arc image controller 191 controls the arc image controller 191 such that the luminance value of the image data transmitted from the image sensor 120 after the welding arc is detected on the basis of the luminance value before the welding arc is detected, The luminance value can be made uniform so as to coincide with each other in the range of. In this case, the operator can comfortably watch the image data whose brightness value is equalized through the display device 150 before and after the welding operation.

As described above, the display device 150 may be mounted on the rear surface of the mask body 110, or more than two may be mounted depending on the positions of the left and right eyes of the user. If only one is mounted on the rear,

The image processing unit 192 processes the image data according to the resolution of the single display device 153 and displays it on the display device 153,

When the display devices 151 and 152 are mounted on the left and right eyes of the user, the image data for each imaging device may be divided and displayed on the left and right display devices 151 and 152, respectively. In addition, the image processor 192 may adjust the luminance, chroma, and brightness of the arc image data filtered by the arc image controller 191 to perform image control so that the image is optimal for the user. In this case, the user may customize brightness, brightness, and saturation.

150: display device 160: arc sensor
181: Light blocking liquid crystal 191:
192:

Claims

At least one imaging element is arranged on the front face,
A mask body having a light liquid crystal disposed thereon and having a display device on its rear surface;
An arc image control unit for filtering the arc image data for the welding arc in the image picked up by the image pickup device and displaying the arc image data on the display device so as to block the operator's eyes from being directly exposed to the welding arc; And
And an arc sensor disposed on the front surface and detecting the welding arc,
The arc image control unit may control the arc image before the welding arc is generated,
The image brightness after the occurrence is equalized,
Wherein the arc image control unit increases or decreases the light transmittance of the light shielding liquid crystal according to the detection result of the arc sensor,
Wherein the light shielding liquid crystal is disposed adjacent to the imaging element and has an area of 100% to 150% of the area of the imaging element,
The display device is disposed at a position corresponding to the left eye and the right eye of the operator when the operator wears the mask body, and the image data is displayed on the left and right eyes of the user, Dimensional stereoscopic image with time lag with respect to the time point provided in the stereoscopic image,
Wherein the mask body is constituted by a top cover and a bottom cover, and one area of the top cover and the bottom cover is fastened by a rotation shaft.

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