Laser protection automatic light changing filter and welding mask

Abstract

The utility model discloses a laser protection auto-dimming filter and a welding mask, which belong to the technical field of laser welding filters, and comprise 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 is 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. According to the utility model, laser is filtered in a reflecting manner by plating the reflecting film on the filter lens, so that the laser is prevented from entering the liquid crystal light valve to cause damage and failure of the liquid crystal light valve, and the laser filtering capability of the filter lens group is not attenuated along with time.

Description

Technical Field

[0001] This utility model relates to the field of laser welding filter technology, specifically to a laser protective automatic light-changing filter and welding mask. Background Technology

[0002] Laser welding is more efficient and produces better quality than traditional arc welding, and it requires less skill from operators. As a result, laser welding is rapidly becoming more widespread, and the market demand for laser welding protective products is increasing.

[0003] Currently, most welding protective masks on the market are used for arc welding. The automatic dimming filters mounted on these masks lack laser protection during laser welding and cannot be used in laser welding scenarios. To increase laser protection, existing technologies, such as Chinese patent document CN220632353U, disclose a variable darkness protective filter and protective device suitable for various welding methods. This protective filter includes: a liquid crystal light valve connected to a control circuit to change the transmittance of visible light; a first cutoff filter layer disposed on one side of the liquid crystal light valve; and a second cutoff filter layer disposed on one side of the liquid crystal light valve. The first cutoff filter layer is used to reduce the transmittance of infrared and ultraviolet rays, and the second cutoff filter layer is used to cut off the infrared band of laser light.

[0004] Although the aforementioned protective filter can block the infrared band of the laser through the second cutoff filter layer, the laser passing through the first cutoff filter layer into the liquid crystal light valve will damage the liquid crystal and reduce the service life of the liquid crystal light valve. Furthermore, adding a second cutoff filter layer will increase production costs and process complexity. Utility Model Content

[0005] The purpose of this invention is to provide a laser protection automatic light-changing filter and welding mask, which solves the problems in the prior art where the protective filter uses multi-layer cutoff filter to filter out ultraviolet rays, infrared rays and lasers, resulting in increased production costs and process complexity, and the problem that lasers entering the liquid crystal light valve will damage the liquid crystal.

[0006] To achieve the above objectives, this utility model provides a laser protection automatic light-changing filter, including a filter lens assembly and a control circuit system. The filter lens assembly includes a filter lens and a liquid crystal light valve. The liquid crystal light valve 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, ultraviolet and laser rays. The filter lens is disposed near the light source, and the liquid crystal light valve is disposed near the human eye. The filter lens and the liquid crystal light valve are bonded together.

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

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

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

[0010] Furthermore, the filter lens group achieves an OD6 or higher protection level against lasers with wavelengths of 900nm to 1100nm in both bright and dark states.

[0011] Furthermore, the reflective film is formed by vacuum deposition and has a multi-layer structure.

[0012] Furthermore, the transmittance of the filter element to ultraviolet light with wavelengths of 200nm to 400nm is less than 0.003%, and the transmittance of infrared light with wavelengths of 780nm to 2000nm is less than 0.014%.

[0013] Furthermore, the transmittance of the filter element for visible light in the wavelength range of 500nm to 780nm is greater than 30%.

[0014] Furthermore, the filter element, the liquid crystal light valve element, and the transparent protective film are bonded together with optical adhesive, and at least one liquid crystal light valve element is provided.

[0015] This utility model also provides a welding mask, including a mask body and the aforementioned automatic light-changing filter. The front of the mask body has a viewing window, and the automatic light-changing filter is detachably installed in the viewing window.

[0016] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:

[0017] This invention discloses a laser protection automatic light-changing filter that filters out infrared, ultraviolet, and laser light by coating a single filter element with a reflective film. Specifically, the reflective film reflects away ultraviolet and infrared light generated during laser welding, providing OD6 or higher protection against lasers with wavelengths from 900nm to 1100nm, while maintaining high transmittance for visible light. The reflective film directly reflects the laser light, preventing it from entering the liquid crystal light valve and extending its lifespan. The transmittance of visible light is primarily controlled by the liquid crystal light valve and the control circuit system, ensuring suitable transmittance to meet the protection requirements for laser and electric welding and for observing the workpiece before arc initiation. Furthermore, compared to existing technologies, the filter element assembly of this application has a more streamlined structure, requiring only one filter element to filter out ultraviolet, infrared, and laser light, thus reducing the thickness, weight, and cost of the filter element assembly and improving wearing comfort.

[0018] It is obvious that the elements or features described in the above individual embodiments can be used alone or in combination in other embodiments. Attached Figure Description

[0019] The dimensions and scales in the accompanying drawings do not represent the actual dimensions and scales of the product. The drawings are for illustrative purposes only, and some non-essential elements or features have been omitted for clarity.

[0020] Figure 1 This is a schematic diagram of the structure of the filter lens assembly in an embodiment of this utility model (I);

[0021] Figure 2 This is a schematic diagram (II) of the structure of the filter lens assembly in an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram illustrating the protective principle of the filter element in this embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the protection principle of the liquid crystal light valve sheet in this embodiment of the utility model;

[0024] Figure 5 This is a schematic diagram of the protective principle of the filter lens assembly in this embodiment of the present invention;

[0025] Figure 6 This is a spectral curve of the filter element in an embodiment of this utility model;

[0026] Figure 7 This is a spectral curve of the filter lens group in the bright state of the liquid crystal light valve in an embodiment of this utility model.

[0027] Explanation of reference numerals in the attached figures

[0028] 1. Filter sheet; 2. Liquid crystal light valve sheet; 3. Transparent protective sheet; 4. Control circuit system. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings. The embodiments described herein are merely preferred embodiments of the present invention. Those skilled in the art can conceive of other ways to implement the present invention based on the preferred embodiments, and such other ways also fall within the scope of the present invention.

[0030] Reference Figures 1-7 This application provides a laser protection automatic light-changing filter, including a filter lens assembly and a control circuit system 4. The filter lens assembly 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. The filter lens 1 has a reflective film coated on one or both sides to reflect infrared, ultraviolet, and laser light. The filter lens 1 filters out laser light through reflection, and the filtering capability of the filter lens assembly does not decrease over time. Moreover, compared with the prior art, the filter lens assembly structure of this application is more streamlined. Only one filter lens 1 is needed to filter out ultraviolet, infrared, and laser light, which helps to reduce the thickness and weight of the filter lens assembly, simplify the manufacturing process, and improve wearing comfort. The reflective film can also reflect ultraviolet and infrared light generated during laser welding and provides a protection level of OD6 or higher for laser wavelengths of 900nm to 1100nm. The reflective film directly reflects the laser light, preventing it from entering the liquid crystal light valve 2 and extending its service life. The transmittance of visible light is mainly controlled by the liquid crystal light valve 2 and the control circuit system 4. The transmittance of visible light is variable, which meets the requirements for protection in laser welding and electric welding and for observing the workpiece before arc initiation. The filter 1 is placed closer to the light source to preferentially reflect ultraviolet rays, infrared rays and lasers generated by welding. The liquid crystal light valve 2 is placed closer to the human eye. The filter 1 and the liquid crystal light valve 2 are bonded together to enhance the overall optical performance of the variable light filter.

[0031] It should be noted that a frame is provided on the outside of the light-changing filter, and the filter lens assembly and control circuit system 4 are installed inside the frame. The frame also serves to protect the filter lens assembly. The liquid crystal light valve 2 is existing technology, employing a mature device commonly used in automatic light-changing welding filters, and 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 leads. The control circuit system 4 includes a PCB, electronic components, battery, solar cell, infrared receiver, and wires, and can have various layouts, which are also existing technology and will not be described in detail here.

[0032] To improve the scratch resistance of the filter lens assembly, some embodiments of this application, such as Figure 1 and Figure 2As shown, a transparent protective sheet 3 is provided on the side of the liquid crystal light valve 2 facing the human eye, and the transparent protective sheet 3 is bonded to the liquid crystal light valve 2 as a whole. The filter sheet 1 and the transparent protective sheet 3 sandwich the liquid crystal light valve 2 in the middle, forming a protective structure for the liquid crystal light valve 2. The transparent protective sheet 3 is made of one of the following materials: glass, PMMA, or PC, which can ensure the scratch resistance of the filter lens assembly. Furthermore, the filter sheet 1, the liquid crystal light valve 2, and the transparent protective sheet 3 are bonded together with optical adhesive. This fixing method can ensure the optical performance and moisture resistance of the filter lens assembly. Specifically, optical UV adhesive or optical silicone is used. At least one liquid crystal light valve 2 is provided, and two or three liquid crystal light valve 2 can be provided according to actual working needs. It can be understood that the filter sheet 1 is made of one of the following materials: glass, PMMA, or PC, and is made with an optical coating.

[0033] like Figure 3 , Figure 4 and Figure 5 As shown, filter lens 1 reflects laser, infrared, ultraviolet, and some visible light through a reflective film. A portion of the visible light passes through filter lens 1 to the position of liquid crystal light valve 2. Liquid crystal light valve 2, through a control circuit system 4, controls the transmittance of visible light, allowing visible light of suitable intensity for the human eye to pass through it. Visible light of suitable intensity for the human eye passes through transparent protective film 3 and enters the human eye, allowing operators to observe the weld points and the welded workpiece. The filter lens assembly formed by filter lens 1, liquid crystal light valve 2, and transparent protective film has advantages such as ultra-high reflectivity, high bandwidth reflection, high visible light transmittance, continuous reflection without attenuation, precise spectral control, and scratch resistance. The reflective film is formed through vacuum deposition and has a multi-layer film structure. The specially designed multi-layer film system has a particularly high selective reflection capability for harmful wavelengths while retaining the transmission of visible light, simplifying the structure of the filter lens assembly.

[0034] Furthermore, such as Figure 6 As shown, filter 1 has a transmittance of more than 30% for visible light with wavelengths of 500nm to 780nm, ensuring a high transmittance for some visible light. Filter 1 has a transmittance of less than 0.003% for ultraviolet light with wavelengths of 200nm to 400nm, less than 0.014% for infrared light with wavelengths of 780nm to 2000nm, and is also close to 0 for blue light with wavelengths of 400nm to 500nm, demonstrating good filtration performance.

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

[0036] Furthermore, the transmittance of the filter assembly in the visible light band is between 3.2% and 0.00016% in the dark. In both bright and dark conditions, the filter assembly provides protection against lasers with wavelengths from 900nm to 1100nm at a level of OD6 or higher, and can also reach OD7 or OD8 or higher.

[0037] Another aspect of this application provides a welding mask, including a mask body and an automatic light-changing filter. A viewing window is provided on the front of the mask body, and the automatic light-changing filter is detachably installed within the viewing window. This welding mask's ability to filter laser light does not decrease over time, and the automatic light-changing filter is detachable, facilitating its maintenance and replacement.

[0038] In the description of this utility model, it should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The scope of protection of this utility model is defined only by the claims. Thanks to the teachings of this utility model, those skilled in the art will readily recognize that alternative structures to the disclosed structure can be used as feasible alternative implementations, and that the disclosed implementations can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. A laser protection automatic light-changing filter, comprising a filter lens assembly and a control circuit system (4), wherein the filter lens assembly comprises a filter lens (1) and a liquid crystal light valve (2), the liquid crystal light valve (2) being electrically connected to the control circuit system (4) for changing the transmittance of visible light; characterized in that, The filter element (1) has a reflective film on at least one side for reflecting infrared, ultraviolet and laser light; the filter element (1) is disposed near the light source, the liquid crystal light valve (2) is disposed near the human eye, and the filter element (1) and the liquid crystal light valve (2) are bonded together.

2. The laser protection automatic light-changing filter according to claim 1, characterized in that, A transparent protective sheet (3) is provided on the side of the liquid crystal light valve (2) facing the human eye, and the transparent protective sheet (3) is bonded to the liquid crystal light valve (2) as a whole.

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

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

5. A laser protection automatic light-changing filter according to claim 1, characterized in that, The filter lens group achieves an OD6 or higher protection level against lasers with wavelengths of 900nm to 1100nm in both bright and dark states.

6. A laser protection automatic light-changing filter according to claim 1, characterized in that, The reflective film is formed by vacuum deposition and has a multi-layer structure.

7. A laser protection automatic light-changing filter according to claim 1, characterized in that, The filter (1) has a transmittance of less than 0.003% for ultraviolet light with wavelengths of 200nm to 400nm and a transmittance of less than 0.014% for infrared light with wavelengths of 780nm to 2000nm.

8. A laser protection automatic light-changing filter according to claim 7, characterized in that, The filter (1) has a transmittance of more than 30% for visible light with wavelengths of 500nm to 780nm.

9. A laser protection automatic light-changing filter according to claim 2, characterized in that, The filter sheet (1), the liquid crystal light valve sheet (2), and the transparent protective sheet (3) are bonded together with optical adhesive, and at least one liquid crystal light valve sheet (2) is provided.

10. A welding mask, characterized in that, The mask includes a main body and an automatic light-changing filter as described in any one of claims 1-9, wherein a viewing window is provided on the front of the main body of the mask, and the automatic light-changing filter is detachably installed in the viewing window.

Images