CN220323681U - Auto-darkening filters and auto-darkening systems and welding masks including the same - Google Patents

Abstract

This application relates to an automatic darkening filter, which includes a liquid crystal cell component that controls the shading degree and a liquid crystal cell component that adjusts the color tone. The liquid crystal cell component that controls the shading degree includes a light state when no voltage is applied and a dark state when voltage is applied. At least one positive liquid crystal cell assembly; the liquid crystal cell assembly for adjusting the hue is fixed on one side of the liquid crystal cell assembly for controlling the shading degree, and the liquid crystal cell assembly for adjusting the hue includes a polarizer close to the side of the liquid crystal cell assembly for controlling the shading degree, The analyzer on the side away from the liquid crystal cell assembly that controls the shading, and the electronically controlled birefringent liquid crystal cell between the polarizer and the analyzer that can adjust the color tone based on the driving voltage. The polarization axis directions are non-parallel to each other and the electronically controlled birefringent liquid crystal cell has a liquid crystal twist angle greater than 90 degrees. The present application also relates to an automatic light-darkening system and a welding mask including an automatic light-darkening filter, enabling simultaneous control of shading and adjustment of color tone during welding operations.

Description

Auto-darkening filters and auto-darkening systems and welding masks including the same

Technical field

The utility model relates to the technical field of safety equipment for welding and cutting operations, in particular to an automatic darkening filter (ADF) used in an automatic darkening welding helmet or a mask. The utility model also relates to an automatic darkening filter including the automatic darkening filter. Automatic dimming system for mirrors and welding helmets.

Background technique

The usual automatic darkening filter controls the light transmittance or shading degree with the help of a combination of UV/IR filter, polarizer and liquid crystal cell to achieve filtering of harmful wavelengths or strong light sources generated during welding and other operations. Through the opacity control, the liquid crystal cell is set up to meet the J.A. Morgan condition, so that when light passes through the liquid crystal layer, the rotation of its polarization plane is independent of the wavelength. In other words, when the Morgan condition is met, the rotation angles of the polarization planes of the incident light of different wavelengths after passing through the liquid crystal layer are the same, the optical rotation rate is almost unchanged in the visible light range, and the optical rotation dispersion is basically eliminated, or this kind of shading degree If the controlled dispersion of the liquid crystal component cannot achieve definite color tone control, in general, the color tone of the automatically dimming opacity filter is basically the same as that of the light source, and can be regarded as a monochromatic filter.

In actual use, in view of the different visual preferences of welding operators, it is hoped to set different tones such as warmer or colder. For example, some want the auto-darkening filter to be more yellowish, while others want it to be more bluish, so as to achieve a comfortable visual state during welding work. In addition, since some welding operators are insensitive to certain hues due to personal reasons, it is necessary to provide a component and its function that enable the hue of the automatic darkening filter to be set, so that the automatic darkening filter can In addition to opacity control, defined tone control is provided to meet the above requirements.

It should be noted that the “Background Art” paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the “Background Art” paragraph may include some prior art that does not constitute prior art known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those skilled in the art before the application of the present invention.

Utility model content

The purpose of this utility model is to overcome the above-mentioned defects in the prior art and provide an automatic light-changing filter with adjustable color tone, a control system for controlling it, and a welding method including the above-mentioned automatic light-changing filter and control system. Compared with existing products on the market, the mask can be selectively adjusted between different tones according to the visual preferences of the welding operator, thereby achieving a more comfortable operating experience during the welding process.

In order to achieve the above purpose, the present invention provides an automatic light-changing filter, which includes a liquid crystal cell assembly for controlling the shading degree and a liquid crystal cell assembly for adjusting the color tone, wherein the liquid crystal cell for controlling the shading degree is The assembly includes at least one positive liquid crystal cell assembly that is in a bright state when no voltage is applied and is in a dark state when a voltage is applied; the liquid crystal cell assembly that adjusts the hue is fixed to the liquid crystal cell that controls the shading degree. One side of the assembly, wherein the liquid crystal cell assembly for adjusting the color tone includes a polarizing plate close to the liquid crystal cell assembly for controlling the shading degree, and a polarizer on the side away from the liquid crystal cell assembly for controlling the shading degree. The analyzer on the side, and an electronically controlled birefringent liquid crystal cell located between the polarizer and the analyzer that can adjust the hue based on the driving voltage, wherein the polarization of the polarizer and the analyzer is The axis directions are non-parallel to each other and the electronically controlled birefringent liquid crystal cell has a liquid crystal twist angle greater than 90 degrees.

Preferably, said at least one positive-working liquid crystal cell assembly includes two or more positive-working liquid crystal cell assemblies fixed together one above the other.

Preferably, the angle between the polarization axes of the polarizer and the analyzer is in a range from greater than 15 degrees to 90 degrees.

Preferably, a filter for filtering ultraviolet rays and/or infrared rays is further provided on the other side of the liquid crystal cell assembly that controls shading degree away from the liquid crystal cell assembly that adjusts hue.

Preferably, each of the at least one positive liquid crystal cell assembly includes a positive liquid crystal cell and polarizers located on both sides of the positive liquid crystal cell along the light traveling direction.

Preferably, the hue adjustable range of the liquid crystal cell assembly for adjusting hue is between 380 and 780 nm, the electronically controlled birefringent liquid crystal cell has a retardation greater than 600nm, and for the electronically controlled birefringent liquid crystal cell The driving voltage is between 0 and 4V.

Preferably, the liquid crystal molecules in the electronically controlled birefringent liquid crystal cell are arranged in any one of DAP mode, surface alignment mode and HAN mode.

According to another aspect of the present invention, an automatic light-changing system for a welding mask is provided, which includes the automatic light-changing filter described in the above description and a control system for controlling it. The control system includes : Micro control unit; photoelectric sensor detection unit for detecting arc starting operation; capable of pre-setting and inputting working parameters in the standby state of the control system and sending the working parameters to the micro control unit a parameter setting unit; and a liquid crystal driving circuit that sends a driving voltage to the liquid crystal cell assembly that controls the shading degree and to the liquid crystal cell assembly that adjusts the hue, and the micro control unit is capable of receiving the signal from the photoelectric sensor. The detection unit receives the detected arcing signal, receives operating parameters from the operating parameter setting unit, and sends a driving signal to the liquid crystal driving circuit to adjust the shading degree and chromaticity of the automatic darkening filter. Communicatively connected with the photoelectric sensor detection unit, the operating parameter setting unit and the liquid crystal driving circuit respectively.

Preferably, the working parameter setting unit includes buttons, knobs or touch screens for pre-setting and inputting the working parameters; and/or the automatic dimming system also includes a warmer or cooler tone for indicating the current configuration. LED indicator light.

According to another aspect of the present invention, a welding mask is provided, which includes a mask body and an automatic light-changing system according to the above description, wherein the automatic light-changing filter in the automatic light-changing system is used to shield light. The liquid crystal box assembly for controlling the degree of light facing outward and the liquid crystal cell assembly for adjusting the color tone facing inward are installed at the front opening of the mask body, and the control system in the automatic light-changing system is integrally installed on The mask body.

Description of the drawings

The above and other aspects of the present invention will be more thoroughly understood and recognized below in conjunction with the accompanying drawings, in which:

Figure 1 is a schematic structural diagram of an automatic darkening filter according to a preferred embodiment of the present invention;

Figure 2 is a schematic block diagram of an automatic dimming system according to the present invention;

Figure 3 is an overall schematic diagram of a welding helmet according to the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present utility model more clear, the present utility model will be further described in detail below with reference to the accompanying drawings and exemplary embodiments. It should be understood that the specific embodiments described here are only used to explain the present utility model, but are not used to limit the protection scope of the present utility model. Unless otherwise expressly stated in the drawings, the size, position, etc., and any distances between them, of various parts, features, elements, etc., and any distances between them are not necessarily to scale and may be disproportionate and/or exaggerated for clarity. of.

The terminology used herein is for the purpose of describing specific exemplary embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be appreciated that the terms "comprises," "comprising," and/or "consisting of," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components but do not exclude the presence of or add one or more other features, integers, steps, operations, elements, parts and/or combinations thereof. Unless otherwise indicated, when a range of values is recited, the upper and lower limits of the range are included, as well as any subranges therebetween. Unless stated otherwise, terms such as "first", "second", etc. are only used to distinguish one element from another element. For example, one element may be termed a "first element" and, similarly, another element may be termed a "second element", or vice versa. The paragraph headings used in this article are for organizational purposes only and should not be construed as limiting the subject matter described.

In this article, "lateral" and "medial" are defined relative to distance from the operator's eyes. Among them, the outer side refers to the side of the automatic darkening filter that is away from the operator's eyes (that is, the side of the welding mask that is incident by ambient light during operation), while the inner side refers to the side of the automatic darkening filter that is close to the operator. side of the eye. Correspondingly, "outward" or "toward the outside" refers to the direction from the inside of the automatic darkening filter to the outside, while "inward" or "toward the inside" refers to the direction from the outside of the automatic darkening filter. medial direction.

Unless expressly indicated otherwise, the terms "about," "approximately," "substantially" and the like mean that quantities, dimensions, formulations, parameters and other quantities and characteristics are not and need not be precise and may be approximate and/ Or larger or smaller as needed.

Unless expressly indicated otherwise, all connections and all operative connections may be direct or indirect. Likewise, all connections and all operative connections may be rigid or non-rigid unless expressly indicated otherwise.

Similar reference numbers refer to similar elements throughout. Accordingly, the same or similar reference numerals may be described with reference to other figures, even if they are neither mentioned nor described in the corresponding figure. Furthermore, even elements not labeled with reference numerals can be described with reference to other drawings.

Figure 1 is a schematic structural diagram of an automatic darkening filter according to the present invention, which clearly shows the relative positional relationship of each liquid crystal component. It should be noted that the dotted lines in the figures are only for the purpose of showing each liquid crystal component more clearly and do not mean that there is no interconnection relationship between them. As shown in the figure, the automatic light-darkening filter 10 includes a liquid crystal cell assembly 101 for controlling the shading degree and a liquid crystal cell assembly 102 for adjusting the color tone, wherein the liquid crystal cell assembly 101 for controlling the shading degree includes at least one The positive liquid crystal cell assembly, in this embodiment, is shown as being fixed together by two positive liquid crystal cell assemblies 101a and 101b stacked on each other, wherein the positive liquid crystal cell assembly 101a includes a positive liquid crystal cell LCD1 and a Polarizers 1011a and 1012a are provided on both sides of the light traveling direction; and the positive liquid crystal cell assembly 101b includes a positive liquid crystal cell LCD2 and polarizers 1011b and 1012b provided on both sides of the positive liquid crystal cell LCD2 along the light traveling direction. Further, the liquid crystal cell assembly 102 for controlling the hue is an electronically controlled birefringent liquid crystal cell assembly, which includes a polarizer 1021 and an analyzer 1022 arranged opposite to each other, and a polarizer located between the polarizer 1021 and the analyzer 1022. Electronically controlled birefringence liquid crystal cell LCD3, wherein the polarization axis directions of the polarizer 1021 and the analyzer 1022 are non-parallel to each other and the electronically controlled birefringence liquid crystal cell has a liquid crystal twist angle greater than 90 degrees. In this application, "non-parallel" means that the polarization axes of the polarizer 1021 and the analyzer 1022 have an obvious angle with each other, ranging from greater than 15 degrees to 90 degrees. More preferably, the directions of the polarization axes of the two are substantially perpendicular, that is, the angle between the polarization axes is in the range of 75 degrees to 90 degrees. It should be noted that the angle between polarization axes referred to in this article refers to the angle between the projection of the corresponding polarization axes on the polarization plane when viewed along the direction of light travel. With reference to Figure 1, the electronically controlled birefringence liquid crystal cell LCD3 is arranged on one side of the above-mentioned positive liquid crystal cell assembly (in practical operation, the side close to the operator's eyes, that is, the inner side) instead of being sandwiched between the positive liquid crystal cell assembly 101a and 101b. Further, the automatic darkening filter 10 can be provided with a filter for Filter 103 for filtering ultraviolet and/or infrared rays (UV/IR). Those skilled in the art can easily understand that the filter 103 can be implemented using an interference filter that reflects infrared radiation and absorbs the ultraviolet component of the welding light, or can also be implemented using a filter that reflects and/or absorbs ultraviolet or infrared rays alone. The purpose of the combination is to remove the invisible light component harmful to human eyes from high-intensity welding light. In addition, each liquid crystal cell assembly as shown in the figure can be driven by a different liquid crystal driving circuit (described in detail below) with a specific driving voltage via an electrical connector (not shown), so that when automatically changing light filtering When the mirror 10 is in the standby state, the positive liquid crystal cells LCD1 and LCD2 are not powered on and are in the standby bright state, and the electronically controlled birefringent liquid crystal cell LCD3 is in the initial default color when it is not powered on; and when welding work When , the positive liquid crystal cells LCD1 and LCD2 are both powered on and in the dark state during operation, and at the same time, the electronically controlled birefringent liquid crystal cell LCD3 is powered on to be in the desired chromaticity.

Further, FIG. 2 shows a schematic block diagram of the automatic dimming system according to the present invention. As shown in the figure, the automatic dimming system includes an automatic dimming filter 10 as shown in Figure 1 (each liquid crystal cell LCD1, LCD2, and LCD3 is symbolically shown in a block diagram for simplicity) and the automatic dimming filter 10. The ADF control system 20 controls the opacity and color tone of the optical filter 10 . Among them, the ADF control system 20 includes a micro control unit MCU, a photoelectric sensor detection unit 201 for detecting the arcing operation, and a liquid crystal driving circuit 202. The micro control unit MCU communicates with the photoelectric sensor detection unit 201 and the liquid crystal driving circuit 202 respectively. Ground connection, so that the micro control unit MCU can receive the detected arcing signal from the photoelectric sensor detection unit 201 and send the driving signal to the liquid crystal driving circuit 202, and the liquid crystal driving circuit 202 can receive the driving signal from the micro control unit MCU. Corresponding drives are respectively sent to the positive liquid crystal cells LCD1 and LCD2 in the liquid crystal cell assembly 101 that controls the shading degree and to the electronically controlled birefringent liquid crystal cell LCD3 in the liquid crystal cell assembly 102 that adjusts the color tone. Voltage to achieve dual adjustment of opacity and color of the automatic darkening filter. In addition, the ADF control system of the present application also includes a working parameter setting unit 203. The micro control unit MCU can receive working parameters preset or input from the working parameter setting unit 203 in the standby state. When arc welding occurs, the photoelectric sensor in the photoelectric sensor detection unit 201 detects changes in ambient light. After processing by the operational amplifier, the photoelectric sensor detection unit 201 transmits the detected arc starting signal to the micro control unit MCU. The micro control unit MCU can correspondingly set the shading degree and hue of the automatic darkening filter according to the intensity of the detected welding arc light or based on the operator's own settings or inputs. The microcontroller unit MCU may include a microcontroller. During operation, the microcontroller reads the working parameters preset or input by the user, and outputs corresponding control signals to the liquid crystal drive circuit 202 to respectively control the positive liquid crystal cell LCD1 and 2 pair welding. The darkness of the arc light after passing through these liquid crystals is adjusted, and the electronically controlled birefringence liquid crystal cell LCD3 is controlled to adjust the color tone of the welding arc light after passing through the liquid crystal cell, thereby protecting the operator's eyes from harm while improving the overall operating environment. under the operator's preferred hue.

Figure 3 shows an overall schematic diagram of a welding mask according to the present invention. The welding mask includes a mask body 30 and an automatic light-changing system as described above. The mask body 30 is used with a headband structure (not shown in the figure). ) connected to be worn on the operator's head. As further shown, the auto-darkening filter 10 is installed at the front opening of the mask body 30 and is oriented with the liquid crystal cell assembly for controlling light opacity facing outward and the liquid crystal cell assembly for adjusting color tone facing inward. , and the ADF control system 20 is integrally installed on the mask body 30 .

In practical operation, the ADF control system 20 is first started to enter the standby state. In the standby state, the working parameter setting unit 203 is used to preset or input working parameters, and the working parameters are sent to the micro control unit MCU. Among them, the preset or input working parameters include but are not limited to: welding parameters, ADF working mode, ADF hue adjustable color settings, and input and display methods of hue adjustment, etc. Further, the welding parameters include but are not limited to shading control parameters, sensitivity control parameters, delay control parameters, etc., and the ADF working modes include but are not limited to grinding, welding, cutting, etc. In this application, the electronically controlled birefringent liquid crystal cell LCD3 is set at the factory with a high liquid crystal twist angle (greater than 90°) and a high retardation (greater than 600nm), as well as appropriate deflection by the polarizer 1021 and the analyzer 1022 Setting, the preferred initial standby color display is warm yellow, and the driving voltage for the electronically controlled birefringent liquid crystal cell LCD3 is between 0 and 4V. When power is applied, the color changes to blue because the above high delay is reduced under the action of voltage. As for the input and display mode of hue adjustment, the working parameter setting unit 203 can include a button 2031. It is preferable to use a selection button setting method to input the hue to be adjusted. Those skilled in the art can also envision using knobs, resistive Or a capacitive touch screen or other methods to adjust the color tone displayed through the automatic darkening filter; in addition, the above-mentioned ADF control system 20 preferably also includes a display device such as an LED indicator light 204. During operation, the micro control unit MCU sends a driving signal to the LED indicator 204 for displaying the current setting type of the color tone preset, for example, displaying a warmer tone or a cooler tone. Those skilled in the art can also envision that Display the current setting type of the tone preset through LED, LCD display, etc.

Next, the welding arc light is detected by the photoelectric sensor in the photoelectric sensor detection unit 201 . When the photoelectric sensor does not detect the arc starting operation (for example, during the operator's confirmation of the welding workpiece or welding site before welding, or when the operator terminates the arc starting operation after the welding is completed), there is no arc starting (work). ) signal is generated and sent to the micro control unit MCU. At this time, the ADF control system 20 remains in the initial standby state. At this time, the positive liquid crystal cells LCD1 and LCD2 that control the shading degree are in a non-powered state. The LCD is in the bright state of standby, which means that the operator can clearly observe the working environment and its surrounding conditions through the automatic darkening filter. At the same time, the micro control unit MCU outputs a default hue setting signal to the corresponding liquid crystal driving circuit that drives the electronically controlled birefringence liquid crystal cell LCD3. At this time, the electronic control voltage output by the liquid crystal driving circuit is 0V, and accordingly the electronically controlled birefringence The liquid crystal box LCD3 displays the above-mentioned warmer (yellow) initial standby tone, and the tone LED indicator displays the preset tone indication in the standby state.

On the other hand, when the operator starts welding and performs arc starting operation, the photoelectric sensor in the photoelectric sensor detection unit 201 detects the welding arc light and further transmits the detected arc starting signal to the micro control unit MCU, and the micro control unit MCU sends a signal to the micro control unit MCU. The corresponding liquid crystal driving circuit 202 that drives the positive liquid crystal cells LCD1 and LCD2 outputs a control signal, and then the corresponding liquid crystal driving circuit 202 applies a certain voltage to the positive liquid crystal cells LCD1 and LCD2 respectively, and the alignment state of the liquid crystal molecules inside LCD1 and LCD2 occurs. Change, at this time, the polarization direction of the incident linearly polarized light will be perpendicular to the transmission axis direction of the outgoing polarizer and will be blocked, thereby being in a dark state, where the degree of shading is based on the previous setting unit 203 of the working parameters in the standby state. Determined by preset or input shading control parameters. At the same time, the micro control unit MCU also outputs the hue setting signal to the liquid crystal driving circuit that drives the electronically controlled birefringent liquid crystal cell LCD3. The liquid crystal driving circuit outputs the corresponding electronic control voltage to the electronically controlled birefringent liquid crystal cell LCD3 to control The electronically controlled birefringent liquid crystal cell LCD3 is set to a preset working tone. Among them, when the preset working color tone is warmer (yellow), the electronic control voltage of the electronically controlled birefringent liquid crystal cell LCD3 output by the liquid crystal driving circuit 202 is preferably set to 0V; When the color is cold (blue), the electrical control voltage of the electrically controlled birefringent liquid crystal cell LCD3 output by the liquid crystal driving circuit 202 is preferably set to 3V. In this application, the electronic control voltage of the liquid crystal driving circuit 202 that drives the electronically controlled birefringent liquid crystal cell LCD3 is set in the range of 0~4V, so that the adjustable range of the hue of the automatic darkening filter is 380~780nm. in between, that is, the maximum hue coverage range can be from red to purple, and the specific color setting can be realized according to the adjustment of the electronic control voltage of the above-mentioned liquid crystal driving circuit 202.

In summary, by adopting the technical solution of the present invention, on the basis of the traditional automatic darkening filter that controls the shading degree, it is possible to selectively switch between different tones according to the visual preferences of the welding operator. Adjustment for a more comfortable operating experience during welding.

It should be noted that the principles of the present invention are explained and described above by taking only preferred embodiments as examples. However, the present invention is not limited to the specific structure in the above-mentioned preferred embodiment, but can produce various modifications.

For example, in the above preferred embodiment, the liquid crystal cell assembly 101 for controlling the shading degree is explained by taking two positive liquid crystal cells LCD1 and LCD2 as an example. However, those skilled in the art can think of providing at least one positive liquid crystal cell. Among them, when the automatic darkening filter is only equipped with a positive liquid crystal cell to control the shading degree, the liquid crystal driving circuit can work at high voltage and low frequency to achieve the low cost of a single liquid crystal cell and high light transmittance. Get a relatively good view. When the automatic darkening filter is equipped with two or more positive liquid crystal cells, the corresponding liquid crystal drive circuit can work at low voltage and high frequency. At this time, the automatic darkening filter of the multi-piece liquid crystal cell can pass Partially changes the twisted state of liquid crystal molecules to adjust the transmittance of light in the dark state.

In addition, in the preferred embodiment shown in Figure 1, each positive liquid crystal cell 101a, 101b is provided with polarizers 1011a, 1012a and 1011b, 1012b respectively on both sides along the light traveling direction. The polarizers are pressed by Sensitive glue is fixed on both sides of the positive liquid crystal cell and has a roughly vertical polarization direction. The corresponding liquid crystal driving circuit applies a vertical electric field to control the rotation of liquid crystal molecules in the liquid crystal layer to change the transmittance of incident external light. In this case, each positive liquid crystal cell and the polarizers on both sides thereof can be manufactured in a modular manner as a whole. In other words, the positive liquid crystal cells LCD1 and LCD2 in the preferred embodiment can be made into modular components together with the polarizers on both sides, and then multiple modular components can be arranged in a stacked manner to control the shading degree. The liquid crystal cell assembly 101. Alternatively, a common polarizer can be provided between a plurality of positive liquid crystal cells, that is, the polarizer between any two adjacent positive liquid crystal cells serves as both a positive polarizer located on the opposite side and The polarizer on the light exit side of the liquid crystal cell also acts as the polarizer on the light entrance side of the positive liquid crystal cell located on the opposite side. In this case, darkening can be obtained by shifting the polarization directions of the two polarizers located at the outermost and innermost sides of the positive liquid crystal cell assembly relative to the normal direction of the polarization direction of the polarizer located between the positive liquid crystal cells. The shading degree is more uniform in the state, making it easier for the operator to observe the details of the processed objects.

In addition, the electronically controlled birefringent liquid crystal cell of the present application does not limit the arrangement of the liquid crystal molecules in it. The DAP method (the long axis of the liquid crystal molecules is arranged perpendicularly to the substrate surface on which the liquid crystal molecules are sandwiched) and the along-plane arrangement can be used as needed. (the long axes of the liquid crystal molecules are arranged parallel to the surface of the substrate on which the liquid crystal molecules are sandwiched) and the HAN mode (the long axes of the liquid crystal molecules are arranged vertically on one side of the substrate and parallel to the other side of the substrate).

Feasible but non-limiting implementations of the automatic light-changing filter according to the present invention have been described in detail above with reference to the accompanying drawings. For those of ordinary skill in the art, modifications and additions to technology and structures, as well as recombination of features in each embodiment, without departing from the scope and essence of the present disclosure as set forth in the following claims, should be regarded as included in the scope of this utility model. Therefore, these modifications and additions that can be imagined under the teachings of the present invention should be regarded as part of this disclosure. The scope of the disclosure is defined by the following appended claims, and includes both known equivalents and as yet unforeseen equivalents as of the filing date of the disclosure.

Claims (10)

1. An automatic light-changing filter (10), characterized in that it includes a liquid crystal cell assembly (101) for controlling the shading degree and a liquid crystal cell assembly (102) for adjusting the color tone, wherein the liquid crystal cell assembly (101) for controlling light opacity includes at least one positive liquid crystal cell assembly that is in a bright state when no voltage is applied and is in a dark state when voltage is applied; The liquid crystal cell assembly (102) for adjusting the hue is fixed on one side of the liquid crystal cell assembly (101) for controlling the shading degree, wherein the liquid crystal cell assembly (102) for adjusting the hue includes a liquid crystal cell assembly close to The polarizer (1021) on the side of the liquid crystal cell assembly (101) that controls the shading degree, and the analyzer (1022) on the side away from the liquid crystal cell assembly (101) that controls the shading degree, And an electronically controlled birefringent liquid crystal cell (LCD3) located between the polarizer (1021) and the analyzer (1022) that can adjust the hue based on the driving voltage, wherein the polarizer (1021) and the analyzer (1022) are The polarization axis directions of the analyzer (1022) are non-parallel to each other and the electronically controlled birefringent liquid crystal cell (LCD3) has a liquid crystal twist angle greater than 90 degrees. 2. The automatic darkening filter (10) according to claim 1, characterized in that the at least one positive liquid crystal cell assembly includes two or more positive liquid crystal cells fixed together in a stacked manner. Components (101a, 101b). 3. The automatic darkening filter (10) according to claim 1, characterized in that the angle between the polarization axes of the polarizer (1021) and the analyzer (1022) is greater than Range of 15 degrees to 90 degrees. 4. The automatic light-changing filter (10) according to any one of claims 1 to 3, characterized in that the liquid crystal cell assembly (101) that controls the shading degree is far away from the pair of The other side of the liquid crystal cell assembly (102) for adjusting the hue is also provided with a filter (103) for filtering ultraviolet and/or infrared rays. 5. The automatic darkening filter (10) according to any one of claims 1 to 3, characterized in that each positive liquid crystal cell assembly in the at least one positive liquid crystal cell assembly includes a positive liquid crystal cell assembly. A liquid crystal cell and polarizers located on both sides of the positive liquid crystal cell along the direction of light travel. 6. The automatic darkening filter (10) according to any one of claims 1 to 3, characterized in that the color tone adjustable range of the liquid crystal cell assembly (102) for adjusting the color tone is between 380 and 380 Between 780nm and 780nm, the electronically controlled birefringent liquid crystal cell (LCD3) has a retardation greater than 600nm, and the driving voltage for the electronically controlled birefringent liquid crystal cell (LCD3) is between 0 and 4V. 7. The automatic darkening filter (10) according to any one of claims 1 to 3, characterized in that the liquid crystal molecules in the electronically controlled birefringent liquid crystal cell (LCD3) are arranged along the surface in a DAP manner. Arrange in either mode or HAN mode. 8. An automatic light-changing system for a welding mask, characterized in that the automatic light-changing system includes the automatic light-changing filter (10) according to any one of claims 1 to 7 and an Controlled control system (20), the control system (20) includes: Microcontroller unit (MCU); A photoelectric sensor detection unit (201) used to detect arcing operations; Being able to preset and input working parameters in the standby state of the control system (20) and send the working parameters to the working parameter setting unit (203) of the micro control unit (MCU); and a liquid crystal driving circuit (202) that sends a driving voltage to the liquid crystal cell assembly (101) that controls the shading degree and the liquid crystal cell assembly (102) that adjusts the color tone, respectively, The micro control unit (MCU) is capable of receiving the detected arcing signal from the photoelectric sensor detection unit (201), receiving operating parameters from the operating parameter setting unit (203), and transmitting data to the liquid crystal driving circuit (202). ) to send driving signals to adjust the shading degree and chromaticity of the automatic darkening filter (10) are respectively related to the photoelectric sensor detection unit (201), the working parameter setting unit (203) and the The liquid crystal driving circuit (202) is communicatively connected. 9. The automatic dimming system according to claim 8, characterized in that the working parameter setting unit (203) includes a button (2031), a knob or a touch screen for pre-setting and inputting the working parameters; and/ Or the automatic dimming system further includes an LED indicator light (204) used to indicate the warmer or cooler color tone of the current configuration. 10. A welding mask, characterized in that it includes: a mask body (30) and an automatic light-changing system according to claim 8 or 9, wherein the automatic light-changing filter (10) in the automatic light-changing system ) is installed at the front opening of the mask body (30) in such a manner that the liquid crystal cell assembly (101) for controlling the shading degree faces outward and the liquid crystal cell assembly (102) for adjusting the color tone faces inward, and the The control system (20) in the automatic dimming system is integrally installed on the mask body (30).