Laser protection automatic light changing filter and welding mask

Abstract

The invention discloses a laser protection automatic light changing filter and a welding mask, and belongs to the technical field of laser welding filters, the laser protection automatic light changing filter comprises a filter lens group and a control circuit system, the filter lens group comprises a filter lens and a liquid crystal light valve plate, and the liquid crystal light valve plate is electrically connected with the control circuit system and used for changing the transmittance of visible light; at least one surface of the filter is plated with a reflecting film for reflecting infrared rays, ultraviolet rays and laser; the filter is arranged close to one side of the light source, the liquid crystal light valve plate is arranged close to one side of human eyes, and the filter and the liquid crystal light valve plate are bonded into a whole. Reflective filtering is performed on the laser in a mode of plating the reflecting film on the filter lens, damage and failure of the liquid crystal light valve caused by the fact that the laser enters the liquid crystal light valve are avoided, and the laser filtering capability of the filter lens group cannot be attenuated along with time.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding filters, and specifically, to a laser protection automatic dimming filter and a welding mask. Background Art

[0002] Laser welding has higher efficiency and better quality than traditional arc welding, and has lower requirements for the skills of operators. Therefore, laser welding is being rapidly popularized, and the market demand for laser welding protection products is increasing.

[0003] At present, the welding protection masks on the market are mostly used for arc welding. The automatic dimming filter lenses assembled on the masks lack protection against lasers during laser welding and cannot be applied to laser welding scenarios. In order to increase the protection function against lasers, the prior art, such as the Chinese patent document with the publication number CN220632353U, discloses a variable darkness protection filter lens and a protection device applicable to various welding methods. The protection filter lens includes: a liquid crystal light valve, which is connected to a control circuit and is used to change the transmittance of visible light; a first cut-off filter layer, which is arranged on one side of the liquid crystal light valve; a second cut-off filter layer, which is arranged on one side of the liquid crystal light valve; wherein, the first cut-off filter layer is used to reduce the transmittance of infrared rays and ultraviolet rays, and the second cut-off filter layer is used to cut off the laser infrared band.

[0004] Although the above protection filter lens can cut off the laser infrared band through the second cut-off filter layer, the laser passing through the first cut-off filter layer and entering the liquid crystal light valve will damage the liquid crystal and reduce the service life of the liquid crystal light valve, and adding the second cut-off filter layer will increase the production cost and process complexity. Summary of the Invention

[0005] The purpose of the present invention is to provide a laser protection automatic dimming filter and a welding mask, so as to solve the problems in the prior art that the protection filter lens uses multiple cut-off filter lenses to filter ultraviolet rays, infrared rays and lasers, resulting in increased production cost and process complexity, and the laser entering the liquid crystal light valve will damage the liquid crystal.

[0006] To achieve the above purpose, the present invention provides a laser protection automatic dimming filter, which includes a filter lens group and a control circuit system. The filter lens group includes a filter lens and a liquid crystal light valve sheet. The liquid crystal light valve sheet is electrically connected to the control circuit system and is used to change the transmittance of visible light. At least one side of the filter lens is coated with a reflective film for reflecting infrared rays, ultraviolet rays and lasers. The filter lens is arranged close to the light source side, and the liquid crystal light valve sheet is arranged close to the human eye side. The filter lens and the liquid crystal light valve sheet are adhered together as a whole.

[0007] Furthermore, a transparent protection sheet is arranged on the side of the liquid crystal light valve sheet facing the human eye, and the transparent protection sheet is adhered to the liquid crystal light valve sheet as a whole.

[0008] Further, the light transmittance of the filter lens group in the bright state in the visible light band is greater than 3.2%.

[0009] Further, the light transmittance of the filter lens group in the dark state in the visible light band is between 3.2% and 0.00016%.

[0010] Further, the protection level of the filter lens group against the laser with a wavelength of 900 nm to 1100 nm reaches OD6 or above in the bright state or the dark state.

[0011] Further, the reflective film is formed by vacuum coating, and the reflective film is a multi-layer structure.

[0012] Further, the light transmittance of the filter lens for ultraviolet rays with a wavelength of 200 nm to 400 nm is less than 0.003%, and the light transmittance for infrared rays with a wavelength of 780 nm to 2000 nm is less than 0.014%.

[0013] Further, the light transmittance of the filter lens for visible light with a wavelength of 500 nm to 780 nm is greater than 30%.

[0014] Further, the filter lens, the liquid crystal light valve sheet and the transparent protection sheet are bonded together by optical glue, and at least one liquid crystal light valve sheet is provided.

[0015] The present invention also provides a welding mask, including a mask main body and the above-mentioned automatic dimming filter. A viewing window is opened on the front surface of the mask main body, and the automatic dimming filter is detachably installed in the viewing window.

[0016] Adopting the technical solution provided by the present invention, compared with the existing well-known technologies, the following beneficial effects are achieved:

[0017] The laser protection automatic dimming filter of the present invention filters infrared rays, ultraviolet rays and lasers by plating a reflective film on a filter lens. That is, the reflective film can reflect the ultraviolet rays and infrared rays generated during laser welding, and the protection level against the laser with a wavelength of 900 nm to 1100 nm reaches OD6 or above, while the visible light has a relatively high light transmittance. The reflective film directly reflects the laser, avoiding the laser from entering the liquid crystal light valve and prolonging the service life of the liquid crystal light valve. The light transmittance of the visible light is mainly controlled by the liquid crystal light valve sheet and the control circuit system, and the visible light has an appropriate light transmittance to meet the requirements for protecting against laser welding and electric welding and observing the workpiece before arcing. Moreover, compared with the prior art, the filter lens group structure of the present application is more concise, and only one filter lens is required to filter ultraviolet rays, infrared rays and lasers, which is beneficial to reducing the thickness, weight and cost of the filter lens group and improving the wearing comfort.

[0018] Obviously, the elements or features described in the above single embodiment can be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the drawings, the dimensions and ratios do not represent the dimensions and ratios of the actual products. The drawings are merely illustrative, and certain non-essential elements or features are omitted for clarity.

[0020] Figure 1 is a schematic structural diagram (one) of the filter lens group in an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram (two) of the filter lens group in an embodiment of the present invention;

[0022] Figure 3 is the protection principle diagram of the filter lens in an embodiment of the present invention;

[0023] Figure 4 is the protection principle diagram of the liquid crystal light valve sheet in an embodiment of the present invention;

[0024] Figure 5 is the protection principle diagram of the filter lens group in an embodiment of the present invention;

[0025] Figure 6 is the spectral curve diagram of the filter lens in an embodiment of the present invention;

[0026] Figure 7 is the spectral curve diagram of the filter lens group when the liquid crystal light valve is in the bright state in an embodiment of the present invention.

[0027] DESCRIPTION OF THE REFERENCE NUMERALS

[0028] 1. Filter lens; 2. Liquid crystal light valve sheet; 3. Transparent protection sheet; 4. Control circuit system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the present invention will be described in detail with reference to the drawings. What is described here is only the preferred embodiment of the present invention. Those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0030] Refer to Figures 1-7, this application provides a laser protection automatic dimming filter, which includes a filter lens group and a control circuit system 4. The filter lens group includes a filter lens 1 and a liquid crystal light valve 2. The liquid crystal light valve 2 is electrically connected to the control circuit system 4 and is used to change the transmittance of visible light. One side or both sides of the filter lens 1 are coated with a reflective film, which is used to reflect infrared rays, ultraviolet rays and lasers. The filter lens 1 filters out the laser by reflection, and the laser filtering ability of the filter lens group will not decay with time. Moreover, compared with the prior art, the structure of the filter lens group of this application is more concise. Only one filter lens 1 is needed to filter out ultraviolet rays, infrared rays and lasers, which is beneficial to reducing the thickness and weight of the filter lens group and simplifying the production process, and improving the wearing comfort. The reflective film can also reflect the ultraviolet rays and infrared rays generated during laser welding, and the laser wavelength protection level for 900nm - 1100nm reaches OD6 and above. The reflective film directly reflects the laser, avoiding the laser from entering the liquid crystal light valve 2 and prolonging the service life of the liquid crystal light valve 2. The transmittance of visible light is mainly controlled by the liquid crystal light valve 2 and the control circuit system 4. The visible light has a variable transmittance, meeting the requirements for the protection of laser welding and electric welding and observing the workpiece before arc starting. The filter lens 1 is arranged on the side close to the light source, so that the ultraviolet rays, infrared rays and lasers in the light source generated by welding are preferentially reflected. The liquid crystal light valve 2 is arranged on the side close to the human eye. The filter lens 1 and the liquid crystal light valve 2 are adhered together as a whole, which can overall improve the optical performance of the dimming filter.

[0031] It should be noted that a frame is provided on the outside of the dimming filter. The filter lens group and the control circuit system 4 are installed in the frame, and the frame also plays a role in protecting the filter lens group. The liquid crystal light valve 2 is a prior art. The liquid crystal light valve 2, a mature device commonly used in automatic dimming electric welding filters, is used to adjust the visible light transmittance of this filter. The liquid crystal light valve 2 is made of electronic glass, liquid crystal, polarizer and electrode pins, etc. The control circuit system 4 is provided with a PCB, electronic components, batteries, solar cells, infrared receiving tubes and wires, etc., and can have various layout methods, which also belong to the prior art and will not be elaborated here.

[0032] In order to improve the scratch resistance of the filter lens group, in some embodiments of this application, such as Figure 1 and Figure 2As shown in the figure, a transparent protection sheet 3 is provided on the side of the liquid crystal light valve sheet 2 facing the human eye, and the transparent protection sheet 3 is bonded to the liquid crystal light valve sheet 2 integrally. The filter lens 1 and the transparent protection sheet 3 sandwich the liquid crystal light valve sheet 2 in the middle to form a protection structure for the liquid crystal light valve sheet 2. The transparent protection sheet 3 is made of one of glass material, PMMA material or PC material, which can ensure the scratch resistance of the filter lens group. Further, the filter lens 1, the liquid crystal light valve sheet 2 and the transparent protection sheet 3 are bonded together by optical glue. Through this fixing method, the optical performance and moisture resistance of the filter lens group can be ensured. Specifically, the optical glue is optical UV glue or optical silicone. At least one liquid crystal light valve sheet 2 is provided. According to actual working needs, two or three liquid crystal light valve sheets 2 can be provided. It can be understood that the filter lens 1 is made of one of glass material, PMMA material or PC material and is made by optical coating.

[0033] As Figure 3 , Figure 4 and Figure 5 shown in the figure, the filter lens 1 reflects laser, infrared rays, ultraviolet rays and part of visible light through the reflection film. Part of the visible light passes through the filter lens 1 and reaches the position of the liquid crystal light valve sheet 2. The liquid crystal light valve sheet 2 controls the transmittance of the visible light through the control circuit system 4, so that the visible light suitable for the intensity of the human eye passes through the liquid crystal light valve sheet 2. The visible light suitable for the intensity of the human eye passes through the transparent protection sheet 3 and enters the human eye, and the operator can observe the solder joints and the welding workpiece. The filter lens group formed by the filter lens 1, the liquid crystal light valve sheet 2 and the transparent protection sheet has the advantages of ultra-high reflectivity, high-bandwidth reflection, high visible light transmittance, continuous reflection without attenuation, precise control of the spectrum and scratch resistance. Among them, the reflection film is formed by vacuum coating, and the reflection film is a multi-layer film structure. The specially designed multi-layer film has the ability to selectively reflect harmful wavelengths particularly, retains the transmission of visible light, and makes the structure of the filter lens group simple.

[0034] Further, as Figure 6 shown in the figure, the transmittance of the filter lens 1 to visible light with wavelengths of 500nm - 780nm is greater than 30%, ensuring a relatively high transmittance of part of the visible light. The transmittance of the filter lens 1 to ultraviolet rays with wavelengths of 200nm - 400nm is less than 0.003%, the transmittance to infrared rays with wavelengths of 780nm - 2000nm is less than 0.014%, and the transmittance to blue light with wavelengths of 400nm - 500nm is also close to 0, having good filtering properties.

[0035] Specifically, as Figure 7 shown in the figure, the transmittance of the filter lens group in the bright state in the visible light band is greater than 3.2%. It should be noted that when the liquid crystal light valve sheet 2 does not work and does not block the visible light, it is in the bright state; when the liquid crystal light valve sheet 2 works and blocks part of the visible light, it is in the dark state.

[0036] In addition, the light transmittance of the filter lens group in the visible light band in the dark state is between 3.2% and 0.00016%. The protection level of the filter lens group against laser light with a wavelength of 900 nm to 1100 nm in the bright state or the dark state reaches OD6 or above, and can also reach above OD7 and OD8.

[0037] On the other hand, the present application provides a welding mask, including a mask body and an auto-darkening filter on the mask body. A viewing window is provided on the front surface of the mask body, and the auto-darkening filter is detachably installed in the viewing window. The laser filtering ability of this welding mask does not decay over time, and the auto-darkening filter can be detached, which is convenient for the care and replacement of the auto-darkening filter.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] The protection scope of the present invention is only defined by the claims. Benefiting from the teachings of the present invention, those skilled in the art can easily recognize that alternative structures of the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. An automatically variable light laser protection filter, comprising a filter lens group and a control circuit system (4), the filter lens group including a filter lens (1) and a liquid crystal light valve sheet (2), the liquid crystal light valve sheet (2) being electrically connected to the control circuit system (4) for changing the transmittance of visible light; characterized in that, At least one side of the filter lens (1) is coated with a reflective film for reflecting infrared rays, ultraviolet rays, and laser light; the filter lens (1) is disposed closer to the light source side, and the liquid crystal light valve sheet (2) is disposed closer to the human eye side. The filter lens (1) and the liquid crystal light valve sheet (2) are adhesively bonded into one body.

2. The automatic variable light filtering laser protection filter according to claim 1, characterized in that, A transparent protective sheet (3) is disposed on the side of the liquid crystal light valve sheet (2) facing the human eye, and the transparent protective sheet (3) and the liquid crystal light valve sheet (2) are adhesively bonded into one body.

3. The laser protection automatic dimming filter according to claim 1, characterized in that The light transmittance of the filter lens group in the bright state in the visible light band is greater than 3.2%.

4. The laser protection automatic dimming filter according to claim 3, characterized in that, The light transmittance of the filter lens group in the dark state in the visible light band is between 3.2% and 0.00016%.

5. The automatic variable light filtering laser protection filter according to claim 1, characterized in that, The protection level of the filter lens group against laser light with a wavelength of 900 nm to 1100 nm reaches OD6 or above in the bright state or the dark state.

6. The automatic dimming laser protection filter according to claim 1, wherein The reflective film is formed by vacuum coating, and the reflective film is a multi-layer structure.

7. The automatic variable light filtering laser protection filter according to claim 1, characterized in that, The light transmittance of the filter lens (1) for ultraviolet rays with a wavelength of 200 nm to 400 nm is less than 0.003%, and the light transmittance for infrared rays with a wavelength of 780 nm to 2000 nm is less than 0.014%.

8. The laser protection automatic dimming filter according to claim 7, characterized in that The light transmittance of the filter lens (1) for visible light with a wavelength of 500 nm to 780 nm is greater than 30%.

9. The laser protection automatic dimming filter according to claim 2, wherein, The filter lens (1), the liquid crystal light valve sheet (2), and the transparent protective sheet (3) are adhesively bonded into one body by optical glue, and at least one liquid crystal light valve sheet (2) is provided.

10. A welding mask, characterized in that, It includes a mask body and the auto-darkening filter according to any one of claims 1-9. A window is provided on the front surface of the mask body, and the auto-darkening filter is detachably installed in the window.

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