KR880003020Y1 - Mask for welding - Google Patents

Abstract

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Description

Welding goggles

1 is a cross-sectional view showing the configuration and principle of the present invention.

2 is a front view showing an embodiment of a welding mask to which the present invention is applied.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a front view showing another embodiment of a welding mask to which the present invention is applied.

5 is a cross-sectional view taken along the line B-B in FIG.

6 is a front view showing another embodiment of a welding mask to which the present invention is applied.

7 is a perspective view of a light shielding eye shield to which the present invention is applied.

8 is a cross-sectional view taken along the line C-C of FIG.

The present invention relates to a flash blocking device that can protect the eyes from the intense light generated during flashing, for example, arc welding or gas welding. It does not interfere with the flash, and when the welding is started and the flash is detected, it operates instantly to block the flash to protect the eyes from the flash, but it does not interfere with normal activities or tasks where the flash does not occur. Relates to a device.

In general, in order to keep the electric arc welding while blocking or weakening the intense arc discharge light generated during electric welding, the worker wears a protective device with a shading window with a deep color filter layer and works. Until the intense light is emitted, the welding position can't be accurately identified through the shading window of the protective equipment. After selecting the approximate position, the electric welding work is performed, which not only reduces the welding accuracy but also reduces the work efficiency. In the process, there was a defect that severely damages the worker's eyes by intense light irritating the eyes.

In addition, in the related art, a mechanical light shielding device has been devised to improve such a problem. However, the mechanical drawbacks include problems such as low reliability, operation noise, and closed speed in any manner. In order to improve the mechanical problem, even in the case of the light shielding device using an electrically operated transparent ceramic plate, a high voltage of 100-300 volts was required, so it had to be connected to a separate power supply.

In recent years, a polarizing filter and a liquid crystal plate are used to detect flashes only when flashes are generated to block the flashes, and the flashes are normally kept in a state where the flashes are not detected to protect the eyes from the flashes. The light shielding filter etc. which have no obstacle to normal observation of objects (such as observation and identification of welds before welding) are disclosed in Japanese Laid-Open Utility Model Publication Nos. 59-26618, 52-162224, and As in So 60-37317, So 50-84525 and So 56-127720.

However, except for No. 52-162224 in such a light shielding filter, a separate power source for driving a liquid crystal plate, that is, a battery is used, and thus a battery accommodating part is required, and a means for connecting a power supply battery to the liquid crystal plate is required. There is a need for a separate sensor (light-receiving sensor) for detecting the structure, which is complicated and inconvenient to use.

In addition, although the lamp of the head 52-162224 uses a photovoltaic cell as a power source, a separate sensor for strobe detection is required, and the structure is complicated and causes a cost increase because it is used to charge electricity generated from the photocell. There was a back lung.

The present invention was devised to solve the problems of the conventional closed and closed, inserting a liquid crystal plate that operates quickly with low voltage, low current between the polarizing plate cross the polarization side, the liquid crystal plate serves as both the detection of light and power To provide a scintillator shield for photovoltaic operation.

Since the polarizing plate has a polarizing plane of cross section as is known, when the incident light having a random polarizing plane passes through the polarizing plate, only the light component of the polarization axis of the polarizing plate passes. Therefore, the incident light passing through the polarizing plate firstly has only a Guam component having a polarization plane in a certain direction, and when passing through the polarizing plate secondly, it passes through the primary polarizing plate when the polarization axis of the secondary polarizing plate crosses the polarization direction of the primary polarizing plate. Since the polarization plane of one incident light crosses the polarization axis of the secondary polarizer, the incident light does not pass through the secondary polarizer. However, when the liquid crystal layer (twisted nematic liquid crystal layer) is inserted between the two polarizing plates, the twisted nematic liquid crystal passes through the primary polarizing plate and twists and rotates the incident light having a single polarization plane, thereby causing the primary polarizing plate. It facilitates the passage of the secondary polarizing plate crossed with the polarization direction.

In other words, when the incident light does not pass through the two polarizing plates intersecting the polarization axes, the incident light passes through the two polarizing plates when a twisted nematic liquid crystal plate is inserted between the two polarizing plates without a voltage applied thereto. However, when voltage is applied to the liquid crystal panel, the torsion characteristic of the field effect type twist nematic liquid crystal disappears, and since it is arranged in a direction parallel to the direction of incident light, the incident light is not affected by the liquid crystal panel, and the polarization side crosses due to the influence of only two polarizing plates. It will not pass through the two polarizers.

Therefore, when intense incident light shines on, photoelectrons detect incident light and apply voltage to the liquid crystal panel. In weak light below a critical amount of light, two polarizing plates attached to front and rear surfaces of the liquid crystal plate that transmit incident light shield the incident light. At this time, the shielding amount of incident light can be adjusted according to the control of the crossing angle of the polarization axis of the two polarizing plates and the polarization ability of the polarizing plate.

In the flash detection shield device of the present invention, in order to operate the liquid crystal panel only at the critical amount of light which is the lowest amount which is desired to shield or weaken the light by operating the liquid crystal plate, the amount of light incident toward the photocell is weakened by the threshold light control filter to enter the photocell. By reducing the voltage and current of the photovoltaic cell to meet the threshold voltage and the current amount, which are the minimum thresholds required for the operation of the liquid crystal panel, the liquid crystal panel may be operated to shield or weaken the light only above a predetermined threshold amount of light. In addition, by installing a power control unit including a variable resistor between the photovoltaic cell and the liquid crystal plate, when the voltage and current generated from the photocell by the incident light amount are transferred to the liquid crystal plate, the voltage and current amount can be easily changed according to the threshold voltage and current amount of the arbitrarily set liquid crystal plate. By adjusting the, the threshold amount to shield or weaken the light can be determined.

The flash detection shield device of the present invention operated in this way can be used as a shading window or flash shield safety glasses for the purpose of automatically weakening immediately upon the intense light irritating to the eyes such as arc welding. It can also be used to protect eyes exposed to sudden intense headlights from night-time cars or outdoors.

Referring to the flash detection shield device according to the present invention in detail as follows.

FIG. 1 shows the structure and principle of the flash sensing device according to the present invention. The liquid crystal plate 2 is formed by attaching protective transparent plates 4 and 4 'on both sides of the liquid crystal 3, and the transparent plates on both sides thereof. (4) Attaching polarizing plates 5 and 5 'on which polarization sides cross each other on both sides of 4' to constitute a light shield window 1 and facing the light incident side together with the polarizing plate 5 A photovoltaic cell 7 is connected to both the liquid crystals 3 on both sides of the liquid crystals 3 through a power supply control unit 8, and a critical light intensity control filter 10 is formed on the bottom of the photovoltaic cell 7. It is constructed by attaching.

The transparent electrode films 6 and 6 'are interposed between the liquid crystal 3 constituting the liquid crystal plate 2 and both transparent plates 4 and 4' and connected to the photovoltaic cell 7. .

Referring to the operation of the flash detection shield according to the present invention having such a configuration as follows.

When the weak light shines, the light is weakened by the threshold light amount control filter 10 attached to the front surface of the photo cell 7 so that the photovoltaic cell 7 has a threshold voltage and a current amount sufficient to operate the liquid crystal plate 2. It doesn't happen. Therefore, since the twisted nematic liquid crystal 3 of the liquid crystal plate 2 maintains its intrinsic torsional characteristics, incident light passes through two polarizing plates 5 and 5 'having the polarization axes intersected.

However, when intense light is emitted, the liquid crystal 3 immediately becomes larger than the generated voltage of the photovoltaic cell 7 and the threshold voltage and current amount for the operation of the liquid crystal plate 2 according to the amount of light passing through the threshold light amount control filter 10. The liquid components of are arranged in parallel with the electric field direction in a twisting state capable of beneficiation, so that light can be blocked or attenuated according to the crossing angle of the polarization axes of the two polarizing plates 5 and 5 '.

The flash detection shield according to the present invention, which operates by such a light shielding method, does not operate below a threshold light amount arbitrarily set according to the intended use, but above the threshold light amount, the voltage generated in the photocell 7 does not operate the liquid crystal 3. Since the liquid crystal 3 is operated above the threshold voltage, the incident light is blocked. However, it is necessary to change the threshold light amount easily for each application because the threshold light amount must be arbitrarily determined according to the use purpose.

In order to operate the liquid crystal 3 only above the threshold light amount, which is the minimum amount of light that the liquid crystal 3 wants to operate, the area of the photovoltaic cell 7 is adjusted or connected in parallel to the minimum voltage necessary for the operation of the liquid crystal 3. The amount of current can also be adjusted, and the light shielding window 1 and the photocell 7 are attached to the front surface of the photocell 7 by attaching a critical light amount control filter 10, which is a colored film, in which the amount of pigment or dye is added according to the set threshold light amount. By regulating in advance whether the amount of incoming light is required to be shielded or weakened, the amount of voltage and current generated from the photovoltaic cell 7 is a threshold voltage and amount of current which is the minimum required to operate the liquid crystal panel 2. Only when abnormal is the liquid crystal plate 2 can be operated to shield or weaken the light.

In addition, when the power control unit 8 including the variable resistor is provided between the photo cell 7 and the liquid crystal panel 2, the power control unit can be easily changed in accordance with the change of the threshold light amount of incident light requiring the operation of the liquid crystal panel 2. By increasing or decreasing the resistance of (8), the amount of voltage and current generated from the photovoltaic cell 7 can be arbitrarily changed.

In addition to the variable resistor, the power regulator 8 is composed of a circuit for changing direct current into alternating current and an auxiliary power supply. Field effect type liquid crystals used in the liquid crystal plate 2, as known in the art, are driven by alternating current rather than direct current, thereby extending their service life.

In the case where incident light having a critical amount of light or more passes through the light shielding window 1, the adjustment of the amount of incident light passing through the light shielding window 1 is determined in accordance with the angle of intersection of the polarization axes of the two polarizing plates 5, 5 ′. Here, when the crossing angle of the polarization axis is 90 °, the light shielding is the maximum value, and as the crossing angle decreases, the amount of transmitted light gradually increases. At this time, it is more effective to coat the direction control film of the liquid crystal for adjusting the linear light angle of the twisted nematic liquid crystal to be equal to the crossing angle of the polarization axis in a manner known on the transparent electrode films 6 and 6 '.

The direction control film of the liquid crystal is generally coated with an organic polymer material or an inorganic material on the transparent electrode film 6 (6 ') and subjected to a so-called rubbing treatment which rubs the surface with a cotton or cloth in a certain direction or uses silicon oxide. It is made using a method such as deposition.

Another method of controlling the amount of transmitted light is possible by adjusting the polarization capabilities of the two polarizers 5 and 5 '. The polarization axes of the two polarizing plates 5 and 5 'were crossed at the same angle. Even though the amount of transmitted light is changed according to the difference in the polarization ability of the polarizing plate itself. In general, the polarizing ability of the polarizing plate can be easily adjusted by adjusting the amount of dye or pigment for forming the polarization axis of the polarizing plate.

In addition, when the transparent transparent plates 4 and 4 'of the liquid crystal 3 are themselves used as polarizing plates, the structure of the light shielding device may be simplified and manufacturing cost may be reduced.

When explaining the embodiments of the flash detection shield according to the present invention by the drawings as follows. However, the present invention is not limited to the examples described below.

Example 1

2 shows an example in which the present invention is applied to a welding mask, and the light shielding window 1 of the glare sensing shielding device according to the present invention is attached to the window 12 of the welding mask 11 instead of a known optical filter. The photovoltaic cell 7 is attached to one side of the window 12.

In addition, as shown in FIG. 3, the front protective glass plate 14, the threshold light intensity control filter 10, the photovoltaic cell 7, the first polarizing plate 5, and the transparent support plate of the liquid crystal from the front surface inside the fixing frame 13 4, the transparent electrode film 6, the liquid crystal 3, the transparent electrode film 6 ', the transparent support plate 4' of the liquid crystal, the second polarizing plate 5 ', and the rear protective glass plate 14'. It is a structure attached to the window 12 of the mask 11 for welding assembling in order.

In the welding operation using the welding mask 11 according to the present embodiment, unlike the conventional welding mask, the liquid crystal panel 2 does not operate to weak light below the set threshold light amount, so that the light shielding field 1 is transparent. As it is kept in the state, the object to be worked on can be seen clearly and the welding can be performed quickly while accurately selecting the working position. Once welding starts and intense light is applied to the welded area, the voltage formed from the photovoltaic cell 7 due to the amount of light incident through the threshold light intensity control filter 10 becomes more than the threshold voltage of the liquid crystal plate 2, so that the twist By aligning the liquid crystal molecules of the liquid crystal 3 in the same direction as the electric field direction of the liquid crystal 3, the intense light is weakened depending on the crossing angle of the polarization axes of the two polarizing plates 5 and 5 '.

Therefore, the intense light generated during the welding operation is automatically weakened as soon as it is incident through the window 12 of the welding mask 11 and enters the worker's eyes, so that the worker can continue welding without being irritated by the eyes. Will be.

When the welding operation is interrupted and the intense light disappears, the voltage generated from the photovoltaic area 7 becomes a threshold for the operation of the liquid crystal plate 2 as the amount of light incident through the critical light amount control filter 10 becomes less than the critical light amount. Since the voltage falls below, the liquid crystal molecules of the liquid crystal 3 which are inwardly parallel to the electric field direction immediately return to the original twist arrangement. Therefore, since the incident light amount passes through the shading window 1 without being weakened, unlike the conventional welding mask, the worker can prepare for the next work while continuing to see the welding work position without interruption. There is an advantage.

In addition, a large amount of ultraviolet rays may be generated during arc welding, and the ultraviolet rays may be applied to the front protective glass plate 14, the first polarizing plate 5, the transparent transparent plate 4 of the liquid reservoir, the transmissive polar membrane 6, and the like. In the case of special welding that absorbs most of the UV light in the course of passing through, it is possible to extend the life of the liquid crystal 2 by replacing the front protective glass plate 14 with a glass plate added with a UV absorber separately. have.

Example 2

4 shows another embodiment of a welding mask to which the present invention is applied, in which photovoltaic cells 7 are provided on both sides of the welding mask 11.

That is, the photovoltaic cell 7 is attached together with the critical light amount control filter 10 on both sides between the front protective glass plate 14 and the polarizing plate 5 of the light shielding window 1, and the front protective glass plate 14 and the photocell 4 The wide angle control plate 15 for controlling the distance between the two is installed on both sides of the front inner surface of the fixing frame (13).

In the present embodiment, since photo cells 7 are attached to both side surfaces of the light shielding window 1, in the case of light incident from the side of the light shielding window 1 rather than from the front side of the light shielding window 1, the light shielding window 1 is covered with the fixing frame 13. The light is incident to the inside of the photocell 7, so that only a part of the front surface of the photocell 7 receives incident light. Therefore, in the photovoltaic cell 7, only a voltage below the threshold voltage for operating the liquid crystal plate 2 is generated, so that the liquid crystal 3 maintains the optical beneficiary characteristic which is not affected by an electric field. By the light shielding window (1) is not affected by only the light incident from the front of the light shielding window (1) is activated to weaken or shield the incident light.

In order to adjust the incident angle of the incident light requiring the light shielding of the light shielding window 1, the thickness of the wide angle control plate 15 may be adjusted.

As the thickness of the wide angle control plate 15 becomes thicker, the wide angle of the incident light capable of light shielding the light shielding window 1 becomes narrower, so that the light shielding of the light shielding window 1 may be controlled only by the incident light shining from the front.

As shown in FIG. 2, when the photovoltaic cell 7 is attached to one side of the front surface, intense light generated from welding of another person working on the side is not incident to the eye through the light shielding window 1. If not, the photocell 7 attached to the front surface of the shading window 1 may be incident to the threshold amount of light or more, so that the light shielding device is operated so that the light shielding of the shading window 1 occurs so that the worker can see the object. The drawback is that there will be no. However, when the photovoltaic cell 7 is attached to both sides of the light shielding window 1 as in the present embodiment, the intense light emitted from the side does not cause light shielding of the light shielding window 1 of the mask 11 for welding. Welding can be carried out with exact confirmation.

Example 3

6 shows an embodiment in which the glare sensing shielding device of the present invention is provided only on a part of the window 12 of the welding mask 11, and the other part is provided with a known optical filter glass plate 16. As shown in FIG.

In the present embodiment, since the light shielding window 1 including the liquid crystal plate 2 is more expensive than the known optical filter glass plate 16, the light shielding window 1 can sufficiently perform the role of the light shielding window while reducing the cost.

The smaller the area of the liquid crystal panel 2, the lower the manufacturing cost, but the narrower field of view that can be seen through the view becomes narrower. Therefore, the light shielding plate 1 is attached to a part of the light shielding window 1 with the minimum area necessary for the confirmation of the welded area. By attaching the well-known optical filter glass plate 16, the light filter window plate 16 is continuously checked by the intense light generated during the welding by checking the welding part through the small shading window 1 and immediately before welding. Through it, you can work while viewing and confirming the welding state of the welded part with a wider field of view.

Example 4

7 shows an embodiment applied to the light shielding goggles 17 which weaken the intense light by using the principle of the flash detection shield of the present invention, and FIG. 8 is a cross-sectional view taken along line C-C of FIG.

In the light shielding goggles 17 according to the present embodiment, a pair of light shielding windows 1 are installed on the spectacle frame 18, a photocell 7 is attached to the front surface thereof, and the light shielding window 1 has two polarizing plates 5. It consists of the structure which inserted the liquid crystal plate 2 between (5 ').

The critical light amount control filter 10 is attached to the front of the photovoltaic cell 7 to adjust the degree of light shielding. (9) and 9 'are conductive wires connecting the photovoltaic cell 7 and the transparent electrode films 6 and 6' of the liquid crystal plate 2 to each other.

In addition to arc welding, the shielding safety glasses 17 according to the present embodiment have intense light on the eyes during operation of oxygen welding or high temperature furnaces (furnace, etc.), and headlights that shine from cars coming at night or outdoors daylight. Even if the eye is irritated by the back, it can be useful and convenient to immediately protect the eye from such irritating light.

Claims (1)

A light-transmitting window 1 in which a field effect liquid crystal plate 5 is inserted between two polarizing plates 5 and 5 'whose polarization axes cross each other, and a photovoltaic cell 7 for obtaining driving power of the liquid crystal plate 2. In the safety glasses for welding, the critical light amount control filter 10 is attached to the front surface of the photovoltaic cell 7, and the power output part 8 of the photovoltaic cell 7 includes a variable resistor. And the field effect liquid crystal plate (2) is connected to the field effect liquid crystal plate (2) to drive the field effect liquid crystal plate (2) when a predetermined voltage or more is generated in the photovoltaic cell (7).