Methods, components, devices, processing equipment, and storage media for light protection

Abstract

This application discloses a method for light protection, a helmet assembly, a light protection device, a processing equipment, and a computer storage medium. The method involves determining whether the power of detected light exceeds a power threshold. If the power exceeds the power threshold, a target filter for protection is determined from a pool of candidate filters based on predetermined parameters and a mapping relationship between the predetermined parameters and filter types. The predetermined parameters include at least one of the optical density value of the filter and the wavelength value of the light. This allows for protection against light of different wavelengths, providing strong adaptability to light, high safety, and improved user experience.

Description

Technical Field

[0001] This disclosure relates to, but is not limited to, the field of laser protection, and particularly to a method for light protection, a helmet assembly, a light protection device, a processing equipment, and a computer storage medium. Background Technology

[0002] Currently, in devices involving light protection, such as goggles used for laser protection, protection of the human eye is achieved by filtering light sources of a fixed wavelength.

[0003] In related technologies, taking common red / green light as an example, goggles used for light protection either filter red light or green light. In practical applications, the protective devices have low intelligence, protect against only a single type of light, have poor adaptability, and cannot adapt to protective scenarios containing multiple light sources. Summary of the Invention

[0004] In view of this, the present disclosure provides a method for light protection, a helmet assembly, a light protection device, a processing device, and a computer storage medium.

[0005] According to a first aspect of the present disclosure, a method for light protection is provided, the method comprising:

[0006] In one embodiment, the method includes:

[0007] Determine whether the power of the detected light is greater than the power threshold;

[0008] If the power is greater than the power threshold, a target filter for protection is determined from the candidate filter filters according to predetermined parameters and the mapping relationship between the predetermined parameters and the filter type; wherein, the predetermined parameters include at least one of the following: the optical density value of the filter, the usage parameters of the filter, and the wavelength value of the light.

[0009] In one embodiment, before determining whether the power of the detected light is greater than a power threshold, the method further includes:

[0010] The light used for detection is filtered out from the ambient light.

[0011] According to a second aspect of the present disclosure, a helmet assembly is provided, the helmet assembly comprising:

[0012] Alternative filter films;

[0013] Guide rails are used to support multiple of the alternative filter plates;

[0014] A drive module is used to drive the alternative filter to move on the guide rail;

[0015] A control module, connected to the drive module, is configured to: determine a target filter for protection from candidate filter films based on predetermined parameters and a mapping relationship between the predetermined parameters and the filter film type; wherein the predetermined parameters include at least one of the optical density value of the filter film, the usage parameters of the filter film, and the wavelength value of the light; and control the drive module to drive the target filter film to move to a predetermined position.

[0016] In one embodiment, the guide rail includes a stationary rail and a moving rail connected to the stationary rail; the control module can control the alternative filter to move in a closed loop on the stationary rail and the moving rail; the moving rail has a first position state and a second position state relative to the stationary rail; the first position state corresponds to the state where the alternative filter is not used; the second position state corresponds to the state where the alternative filter is used.

[0017] In one embodiment, the guide rail includes an upper rail and a lower rail; the alternative filter is sandwiched between the upper rail and the lower rail.

[0018] In one embodiment, the upper rail is a fully annular structure, and the lower rail is an unclosed annular structure; the two ends of the lower rail are respectively provided with a component to be adsorbed and an adsorption component; the component to be adsorbed and the adsorption component are used to provide suction force that makes the lower rail close the loop.

[0019] In one embodiment, the helmet assembly further includes: a helmet body and an operating rope;

[0020] The helmet is equipped with a dimmable glass control unit.

[0021] The dimmable glass control unit includes: a bracket and a bracket guide groove;

[0022] The bracket is equipped with: a dimmable glass, a bracket positioning post, a helmet positioning post, and a positioning post guide groove;

[0023] The bracket is installed between the bracket guide grooves, and the bracket guide grooves are used to guide the direction of movement of the bracket and the dimmable glass on the bracket;

[0024] The helmet positioning post passes through the positioning post guide groove and is fixed to the helmet body;

[0025] The operating rope is wound between the helmet positioning post and the bracket positioning post; by pulling the operating rope, the operating rope between the bracket positioning post and the helmet positioning post contracts, thereby driving the bracket where the bracket positioning post is located to move.

[0026] In one embodiment, the bracket guide groove further includes a groove handle; the helmet assembly further includes a return spring; the return spring is located between the groove handle and the bracket; and is used to drive the bracket back to its initial position when it has not moved.

[0027] According to a third aspect of the present disclosure, a light protection device is provided, the device comprising:

[0028] The determining module is configured to: determine whether the power of the detected light is greater than a power threshold; if the power is greater than the power threshold, determine a target filter for protection from candidate filter filters according to predetermined parameters and the mapping relationship between the predetermined parameters and the filter type; wherein the predetermined parameters include at least one of the optical density value of the filter, the usage parameters of the filter, and the wavelength value of the light.

[0029] In one embodiment, the apparatus further includes:

[0030] A filtering module is used to filter out the light used for detection from ambient light.

[0031] According to a fourth aspect of the present disclosure, a processing apparatus is provided, comprising: a processor and a memory for storing a computer program capable of running on the processor, wherein...

[0032] The processor is used to execute the steps of the methods described in one or more of the foregoing technical solutions when running a computer program.

[0033] According to a fifth aspect of the present disclosure, a storage medium is provided.

[0034] In one embodiment, a computer program is stored on the storage medium, and when the computer program is executed by a processor, it implements the method described in one or more of the foregoing technical solutions.

[0035] In the technical solution provided by this disclosure, the target filter is determined based on predetermined parameters and the mapping relationship between the predetermined parameters and the filter. The predetermined parameters include at least one of the optical density value of the filter, the usage parameters of the filter, and the wavelength value of the light. That is, for different types of light, the predetermined parameters can be used to select a filter corresponding to the light source within the mapping relationship. Therefore, compared to light protection devices that can only filter a single light source, this technical solution can switch the corresponding target filter based on the wavelength value of the light, the usage parameters of the filter, and the optical density of the filter for different types of light sources. This allows for protection against light of different wavelengths, providing strong adaptability to light, high security, and improved user experience. Attached Figure Description

[0036] Figure 1 This is a schematic flowchart illustrating a method for protecting light according to an exemplary embodiment.

[0037] Figure 2 This is a schematic flowchart illustrating a method for protecting light according to an exemplary embodiment.

[0038] Figure 3 This is a schematic diagram illustrating the structure of a helmet assembly according to an exemplary embodiment.

[0039] Figure 4 This is a schematic diagram illustrating the structure of a helmet assembly according to an exemplary embodiment.

[0040] Figure 5 This is a schematic diagram illustrating the structure of a helmet assembly according to an exemplary embodiment. Detailed Implementation

[0041] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0043] To better understand the embodiments of this disclosure, the following exemplary embodiments illustrate the application scenarios of the technical term "light protection" in the related art:

[0044] Laser radiation can cause damage to the cornea, lens, and retina of the eye. The extent of the damage depends primarily on the wavelength of the light and the energy absorption properties of the eye's media. Laser-induced biological damage is caused by the accumulation of heat energy or photochemical processes in a very small area. Infrared, ultraviolet, and visible laser radiation can all damage the eye.

[0045] In some embodiments, please refer to Table 1, which shows the mapping relationship between light sources of different wavelengths and the sites of damage caused by the light sources.

[0046] Table 1

[0047] spectral region wavelength Key organizations under threat Ultraviolet C 100-280nm cornea Ultraviolet B 280-315nm cornea Ultraviolet A 315-400nm lens Visible light 400-760nm retina Infrared light A 760-1400nm retina Infrared light B 1.4-3.0μm cornea Infrared light C 3.0-1000μm cornea

[0048] like Figure 1 As shown, this disclosure provides a method for protecting against light. The method includes:

[0049] Step 11: Determine whether the power of the detected light is greater than the power threshold;

[0050] Step 12: If the power is greater than the power threshold, determine the target filter for protection from the candidate filter filters according to the predetermined parameters and the mapping relationship between the predetermined parameters and the filter type; wherein the predetermined parameters include at least one of the following: the optical density value of the filter, the usage parameters of the filter, and the wavelength value of the light.

[0051] Step 13: If the power is less than the power threshold, the protection mode is not activated.

[0052] In one embodiment, the optical density value of the filter is determined by an optical density meter. For example, the optical density value may be the average value measured for the same type of light under different environments; or, it may be the average value measured for light with wavelengths within the same preset range under the same environment.

[0053] In one embodiment, the detected light may be a laser incident within the periorbital area, including blue laser, green laser, and red laser; or, the detected light may include ultraviolet light, visible light, and infrared light, wherein the wavelength of the infrared light is greater than the wavelength of the visible light, and the wavelength of the visible light is greater than the wavelength of the ultraviolet light.

[0054] In one embodiment, whether to activate the protection mode is determined based on whether the power of the detected light is greater than a power threshold; if the power is greater than or equal to the power threshold, the protection mode is activated; otherwise, if the power is less than the power threshold, the protection mode is not activated. This reduces energy consumption, selecting the target filter only when light protection is required. Here, "greater than" can refer to cases greater than or equal to, and "less than" can refer to cases less than or equal to.

[0055] The preset range of the power threshold can be determined based on the light energy density parameter that the human eye can tolerate. Thus, the power threshold can be adapted to the light energy density parameter that the human eye can tolerate.

[0056] For example, the light energy density that the human eye can withstand is x, for example, x could be 50mW / m 2 The light energy density parameter is a value less than the light energy density. If the light energy density parameter is set to be less than a first value, the power threshold is also less than the first value; the power threshold is determined to be greater than a second value. The second value is used to prevent the protection mode from being activated for non-invasive light. Thus, the predetermined range of the determined power threshold can activate the protection mode for light that could harm the human eye; at the same time, it prevents the protection mode from being activated for non-invasive light due to the power threshold being too low.

[0057] In one embodiment, the power threshold can be manually configured at or above a set value based on the sensitivity of the optical power meter. For example, the set value could be 1mW.

[0058] In one embodiment, the power of the detected light can be converted into an electrical signal, and the power value corresponding to the value of the electrical signal can be determined; the power value can be compared with the power threshold to determine whether to enable the protection mode.

[0059] For example, the power value may be a power value measured for one detected light source; or it may be an average power value measured for multiple detected light sources.

[0060] For example, an optical power meter can be used to detect the power of the light rays.

[0061] In one embodiment, the wavelength value of the light can be detected before determining whether to enable the protection mode; or, the wavelength value of the light can be detected after determining whether to enable the protection mode, and a target filter for protection can be determined from candidate filter filters based on at least one of the wavelength value and the optical density value of the filter and the filter.

[0062] For example, the wavelength of the light is determined by a portable spectrometer.

[0063] In one embodiment, the determination of whether to activate the protection mode is based on the relationship between the wavelength value of the light and the power of the light and a set of safety thresholds, wherein the set of safety thresholds includes: wavelength thresholds and power thresholds.

[0064] Whether the wavelength value of the light is within the preset range of the wavelength threshold can be determined based on the light energy of light with different wavelength values ​​within a certain optical path. If the light energy is greater than a predetermined value, the wavelength value of the light is within the preset range.

[0065] If the wavelength of the light is within a preset range of the wavelength threshold and the power of the light is greater than the power threshold, the protection mode is activated; and / or, if the wavelength of the light is within a preset range of the wavelength threshold and the power of the light is less than the power threshold, the protection mode is deactivated. This reduces energy consumption, allowing the target filter to be selected only when light protection is required.

[0066] In one embodiment, a target filter for protection is determined from candidate filter films based on predetermined parameters and a mapping relationship between the predetermined parameters and filter film types; wherein the predetermined parameters include at least one of the optical density value of the filter film and the wavelength value of the light. For example, please refer to Table 2, which illustrates a predetermined parameter and a mapping relationship between the predetermined parameters and filter film types.

[0067] Table 2

[0068] spectral region wavelength Optical density value Filter type Ultraviolet light 100-400nm OD 6+ Low-band filter Visible light 400-760nm OD 3+ to OD 7+ Mid-band filter Infrared light 760nm-1000μm OD 5+ to OD13+ High-band filter

[0069] In one embodiment, the alternative filter may include: at least one low-band filter, at least one mid-band filter, and at least one high-band filter; the target filter is determined according to the mapping relationship between the wavelength value of light and the filter type; wherein, the filter type is determined by the type of light that the filter can protect against.

[0070] In one embodiment, the low-band filter is used to protect low-band light, the mid-band filter is used to protect mid-band light, and the high-band filter is used to protect high-band light; wherein, the low-band light is used to indicate light with a wavelength value less than a first wavelength value, the mid-band light is used to indicate light with a wavelength value between [a, b], and the high-band light is used to indicate light with a wavelength value greater than a second wavelength value. Wherein, 'a' indicates the first wavelength value, and 'b' indicates the second wavelength value.

[0071] In one embodiment, a target filter is selected based on the mapping relationship between the wavelength value of the light and the type of filter. This allows for the determination of the required target filter based on different wavelength values ​​of the light, resulting in highly targeted light protection. For example, if the detected light is mid-wavelength light, the mid-wavelength filter is selected as the target filter. Here, the protection range of the mid-wavelength filter can include only light with wavelengths within the [a, b] region, or it can include light with wavelengths outside that region. Similarly, the protection range of the low-wavelength filter and the high-wavelength filter is not limited. For example, the first wavelength value can be 400 nm, and the second wavelength value can be 760 nm. In this case, the low-wavelength light is ultraviolet light, the mid-wavelength light is visible light, and the high-wavelength light is infrared light. In one embodiment, the type of target filter is determined based on the mapping relationship between the optical density value of the filter and the standard absorbance corresponding to light with different wavelengths; the standard absorbance is used to indicate the optical density value of safe light that the filter can obtain after filtering various types of light.

[0072] In one embodiment, the light energy of the safety light is less than the maximum permissible exposure level, which refers to the maximum level of light emission to ensure that exposure to the light does not cause harmful effects or adverse biological changes to the eyes or skin. For example, the light energy of the safety light is less than one-tenth of the maximum permissible exposure level.

[0073] For example, the light energy of the safety light is A, and the standard absorbance corresponding to the light with wavelength B is C. Here, C indicates the optical density value of the safety light A that the filter can acquire after filtering various types of light. Therefore, when protecting the light, the optical density value of the selected target filter should be D; D is within a predetermined range determined by C. For example, a1 = 0.9C, b1 = 1.1C, and the range of D can be a1 < D < b1.

[0074] In one embodiment, a target filter is determined based on the wavelength of the light and the optical density of the filter, wherein the relationship between the wavelength of the light and the optical density of the filter for that light is inversely related. That is, the smaller the wavelength of the light, the greater the optical density of the target filter for protecting against that light.

[0075] For example, the optical density value of the low-band filter is greater than a first predetermined value, the optical density value of the mid-band filter is greater than a second predetermined value, and the optical density value of the high-band filter is greater than a third predetermined value. The first predetermined value indicates the standard absorbance for low-band light, the second predetermined value indicates the standard absorbance for mid-band light, and the third predetermined value indicates the standard absorbance for high-band light.

[0076] For example, if the wavelength of the light is less than 400 nm, a filter with an optical density greater than a second predetermined value is selected as the target filter. Thus, for light with a short wavelength, which has high light energy, selecting a filter with an optical density greater than the second predetermined value can effectively absorb the light energy, reducing the light energy incident on the eye and providing strong protection.

[0077] In one embodiment, a target filter for protection is determined from candidate filter sheets based on predetermined parameters and a mapping relationship between the predetermined parameters and the filter sheet type; wherein the predetermined parameters include at least one of the optical density value of the filter sheet, the usage parameters of the filter sheet, and the wavelength value of the light.

[0078] In one embodiment, the usage parameters may include at least one of the visible light transmittance and hazard parameters of the filter. Thus, based on user needs, a comprehensive comparison can be made to select the most suitable target filter for protecting against the light.

[0079] In one embodiment, the visible light transmittance and optical density values ​​of the filter are positively correlated with the protective properties of the filter, while the hazard parameters of the filter are negatively correlated with the protective properties of the filter.

[0080] In one embodiment, for light A with the same wavelength value, there are at least two types of filters that can protect the light from the wavelength value within the protection range. The type of the target filter is determined by comparing at least one of the usage parameters and optical density values ​​of the at least two filters. For example, if there are two filters, B and C, that can protect against light A, wherein filter B has a higher visible light transmittance than filter C, and filter B and C have the same optical density value and hazard parameter, then the type of the target filter is determined to be B.

[0081] In one embodiment, during the process of determining the type of target filter by comparing at least one of the visible light transmittance, hazard parameters, and optical density values ​​of at least two types of filters, a comparison priority exists. For example, when protecting against light A with the same wavelength value, the comparison priority is: hazard parameter > optical density value > visible light transmittance. Here, the comparison priority indicates the weight of each parameter during the comparison process. For example, if the optical density values ​​of filter B and filter C are close, and the visible light transmittance of filter B is greater than that of filter C, but the hazard parameter of filter B is also greater than that of filter C, then filter C is determined to be the target filter because the hazard parameter has the greatest weight in the comparison process.

[0082] For example, in one embodiment, the alternative filter may include: a wideband mode filter, a glass laser mode filter, and a coated glass filter. The wideband mode filter may be of model T5B02, and the optical density value of the T5B02 filter is OD1. + The visible light transmittance is 5%, and the wavelength range it can protect against is 400nm to 700nm, with low hazard parameters. The glass laser mode filter can be model T5H04, and the optical density value of the T5H04 filter is within OD 2. + To OD 8 +The protected wavelength range is 630nm to 1064nm, with a visible transmittance higher than 50%; the coated glass filter can be model T5K04, and the optical density value of the T5K04 filter is within the OD5 range. + To OD 13 + The wavelength range it can protect against is 830nm to 10600nm, and the visible transmittance is higher than 77%. However, the hazard parameter value of T5K04 is high, and the potential hazards include: very high reflected light intensity, which may cause damage to other people's eyes.

[0083] For example, when the wavelength of the light is 640nm, although the laser is within the protection range of the T5B02 filter, the visible light transmittance of the T5B02 filter is low; while the visible light transmittance of the T5H04 filter is high, and it can also protect the laser. In this case, in the mapping relationship, the target filter model corresponding to the 640nm wavelength laser is T5H04. This can be, but is not limited to, [the specific filter model].

[0084] For example, when the wavelength of light is 1000nm, although the optical density and visible light transmittance of the T5K04 filter are higher, the hazard parameter value of the T5K04 filter is high. Therefore, in the mapping relationship, the target filter model corresponding to the 1000nm laser is T5H04, so as to protect the detected light and not harm other people's eyes.

[0085] For example, when the wavelength of the light is 10000nm, although the hazard parameter value of the T5K04 filter is high, the wavelength of the laser exceeds the protection range of the T5H04 filter. In this case, in the mapping relationship, the target filter corresponding to the laser with a wavelength of 10000nm is the T5K04 filter.

[0086] In some embodiments, the alternative filter can be any filter existing in the related art. For example, the filter can be a polycarbonate filter, a glass filter, or a glass-coated filter, etc.

[0087] In the technical solution provided in this embodiment, it is determined whether the power of the detected light is greater than a power threshold; if the power is greater than the power threshold, a target filter for protection is determined from the candidate filter filters according to predetermined parameters and the mapping relationship between the predetermined parameters and the filter type; wherein, the predetermined parameters include at least one of the optical density value of the filter and the wavelength value of the light.

[0088] Here, the target filter is determined based on predetermined parameters and the mapping relationship between these parameters and the filter. These predetermined parameters include at least one of the filter's optical density value, its usage parameters, and the wavelength of the light. Therefore, compared to laser protection devices in related technologies that can only filter a single light source, this disclosed solution switches the corresponding target filter based on the wavelength of the light, the filter's usage parameters, and its optical density. This allows for protection against light sources of different wavelengths, resulting in high safety.

[0089] like Figure 2 As shown, this disclosure provides a method for protecting against light, the method comprising:

[0090] Step 21: Filter the light used for detection from the ambient light.

[0091] In some embodiments, the ambient light can be a general term for light sources that reflect light from objects in the environment; or, the ambient light can be used to indicate reflected light from the ground; or, the ambient light can be used to indicate the sum of natural and artificial light sources in the surrounding environment.

[0092] In some embodiments, ordinary ambient light in the ambient light can be filtered out by a filter or polarizer to obtain the light for detection, wherein the ordinary ambient light is used to indicate ambient light that will not cause harm to the human eye.

[0093] In some embodiments, the light used for detection may be laser light, infrared light, ultraviolet light, visible light, etc.

[0094] In this way, safe light sources in the environment, such as sunlight, can be filtered out, allowing protective measures to be taken only against aggressive light sources. This provides highly targeted and efficient protection.

[0095] like Figure 3 As shown, this disclosure provides a helmet assembly. The helmet assembly includes:

[0096] Alternate filter 10;

[0097] Guide rail 20 is used to carry multiple alternative filter sheets 10;

[0098] The drive module 30 is used to drive the alternative filter 10 to move on the guide rail 20;

[0099] The control module 40, connected to the drive module 30, is used to: determine a target filter for protection from the candidate filter sheets 10 according to predetermined parameters and the mapping relationship between the predetermined parameters and the filter sheet type; wherein the predetermined parameters include at least one of the optical density value of the filter sheet, the usage parameters of the filter sheet, and the wavelength value of the light; and control the drive module 30 to drive the target filter sheet to move to a predetermined position.

[0100] In one embodiment, the alternative filter 10 may include any of the filter filters described in the above embodiments.

[0101] In one embodiment, the guide rail 20 includes a stationary rail 201 and a moving rail 202 connected to the stationary rail 201 (e.g., ...). Figure 5 (as shown); the control module 40 can control the alternative filter 10 to achieve closed-loop movement on the stationary rail 201 and the moving rail 202; the moving rail 202 has a first position state and a second position state relative to the stationary rail 201; the first position state corresponds to the state where the alternative filter 10 is not used; the second position state corresponds to the state where the alternative filter 10 is used.

[0102] In one embodiment, the stationary rail 201 can be a hollow rail, and one end of the moving rail 202 can be fixed inside the stationary rail 201 (e.g., ...). Figure 5 (As shown). For example, one end of the moving rail 202 can be fixed to the tail end inside the stationary rail 201, or one end of the moving rail 202 can be fixed at any position inside the stationary rail 201.

[0103] In one embodiment, the stationary track 201 may be an open loop track. For example, the stationary track 201 may be a semi-loop track.

[0104] In one embodiment, the moving track 202 is a retractable track; the moving track 202 has a first position state and a second position state relative to the stationary track 201, wherein the first position state indicates that the moving track 202 retracts inside the stationary track 201; and the second position state indicates that the moving track 202 extends out of the stationary track 201. Exemplarily, the direction of retraction of the moving track 202 can be a circular direction indicated by the stationary track 201. The circular direction is determined by the closed circular track state formed by the unclosed circular track of the stationary track 201 and a virtual track, wherein the virtual track is an objectively non-existent track; it can be used to connect with the stationary track 201, thereby indicating the virtual state of the closed circular track.

[0105] For ease of understanding, one end of the moving rail 202 inside the stationary rail 201 is referred to as the first moving rail end, and the other end of the moving rail 202 is referred to as the second moving rail end; the port of the stationary rail 201 for the extension and retraction of the second moving rail end is referred to as the first stationary rail end, and the other end of the stationary rail 201 is referred to as the second stationary rail end.

[0106] In one embodiment, the second moving rail end may be provided with an operating handle, which is used to drive the moving rail 202 from the first position state to the second position state when it is pulled. Exemplarily, the moving rail 202 switches between the first and second position states by moving along the annular direction.

[0107] In one embodiment, the first position state corresponds to the state where the alternative filter 10 is not used; the second position state corresponds to the state where the alternative filter 10 is used. For example, when the moving rail 202 is in the first position state, the alternative filter 10 is stationary on the stationary rail 201; when the moving rail 202 is in the second position state, the driving module 30 drives the alternative filter 10 to move on the annular track formed by the moving rail 202 and the stationary rail 201. For example, the annular track may coincide with the closed loop track formed by the stationary rail 201 and the virtual track.

[0108] In one embodiment, the first moving end of the moving rail 202 is connected to the second stationary end inside the stationary rail 201 via a spring; the spring is used to change the moving rail 202 from the second position state to the first position state. Thus, when the second moving end of the moving rail 202 is disconnected from the second stationary end outside the stationary rail 201, the spring provides a pulling force to the moving rail 202, causing the moving rail 202 to return to its initial position and quickly reset.

[0109] In one embodiment, the predetermined position is a position relative to the front of the person's eyes within the space formed by the helmet assembly.

[0110] In one embodiment, the guide rail 20 includes an upper rail 203 and a lower rail 204; the alternative filter is sandwiched between the upper rail 203 and the lower rail 204.

[0111] In one embodiment, such as Figure 5 As shown, the upper rail 203 has a recessed groove on the side opposite to the lower rail 204; the alternative filter 10 is sandwiched between the recessed groove of the upper rail 203 and the lower rail 204.

[0112] In one embodiment, such as Figure 4As shown, the drive module includes: a gear 301, a rack 302, and a drive motor 303; as Figure 4 The upper rail 203 shown has an inner cavity with a rack 302 connected to the alternative filter 10. The upper rail 203 also has an opening, through which a gear 301 meshes with the rack 302. The drive motor 303 drives the alternative filter 10 to move within the annular area formed by the upper rail 203 and the lower rail 204 through the meshing of the gear 301 and the rack 302.

[0113] In one embodiment, such as Figure 5 As shown, the upper rail 203 is a fully annular structure, and the lower rail 204 is an unclosed annular structure; the two ends of the lower rail 204 are respectively provided with a component to be adsorbed 2042 and an adsorption component 2041; the component to be adsorbed 2041 and the adsorption component 2041 are used to provide suction force to close the lower rail 204.

[0114] In one embodiment, the lower rail 204 further includes, for example, Figure 5 The moving rail 202 and the stationary rail 201 are shown; one end of the stationary rail 201 and one end of the moving rail 202 are respectively provided with a component to be adsorbed 2042 and an adsorption component 2041; the component to be adsorbed 2042 and the adsorption component 2041 are used to provide suction force to form a closed loop between the moving rail 202 and the stationary rail 201.

[0115] In the first position, the lower rail 204 is an open ring structure, wherein the moving rail 202 is located inside the stationary rail 201; in the second position, the moving rail 202 extends out from the stationary rail 201, and the end of the second moving rail and the end of the second stationary rail 201 are connected by the suction force provided by the adsorption component and the adsorption component.

[0116] In one embodiment, the drive module 30 includes a gear 301 and a rack 302; the gear 301 meshes with the rack 302, and the rack 302 is fixedly connected to the alternative filter 10.

[0117] The drive module 30 further includes a drive motor 303; the drive motor 303 drives the alternative filter 10 to move on the lower rail 204 by meshing with the rack 302 via a drive gear 301.

[0118] In one embodiment, the control module 40 includes: a sensor; a mapping identifier is provided on each candidate filter 10, and the value of a predetermined parameter corresponding to the mapping identifier on each candidate filter 10 is different; the sensor determines the target filter for protection from the candidate filter 10 according to the detected mapping identifier.

[0119] For example, the mapping identifier can be a color, an image, or a magnetic sheet, etc., and correspondingly, the sensor can be a color sensor, an image sensor, or a magnetic field sensor, etc.

[0120] In some embodiments, the control module 40 can implement any of the light protection methods described in the embodiments of this disclosure.

[0121] When the moving rail 202 is in the second position state, it forms a ring track with the stationary rail 201, and the driving component is used to provide power to drive the target filter to move on the ring track.

[0122] In this embodiment, the control module 40 controls the driving module 30 to move the target filter to a predetermined position. The target filter is determined based on predetermined parameters and the mapping relationship between these parameters and the filter. The predetermined parameters include at least one of the optical density value of the filter and the wavelength value of the light. Therefore, compared to laser protection devices in related technologies that can only filter a single light source, this solution switches the corresponding target filter based on the wavelength value of the light and the optical density of the filter. This allows for switching between different target filters for light sources of different wavelengths, resulting in strong protection and high safety.

[0123] like Figure 4 As shown, this disclosure provides a helmet assembly. The helmet assembly includes:

[0124] The guide rail 20 includes a stationary rail 201 and a moving rail 202 connected to the stationary rail 201; the control module 40 can control the alternative filter 10 to achieve closed-loop movement on the stationary rail 201 and the moving rail 202; the moving rail 202 has a first position state and a second position state relative to the stationary rail 201; the first position state corresponds to the state where the alternative filter 10 is not used; the second position state corresponds to the state where the alternative filter 10 is used.

[0125] In one embodiment, the stationary rail 201 can be a hollow rail, and one end of the moving rail 202 can be fixed inside the stationary rail 201. For example, one end of the moving rail 202 can be fixed at the tail end inside the stationary rail 201, or one end of the moving rail 202 can be fixed at any position inside the stationary rail 201.

[0126] In one embodiment, the stationary track 201 can be an open loop track. For example, the stationary track 201 can be a semi-loop track.

[0127] In one embodiment, the moving track 202 is a retractable track; the moving track 202 has a first position state and a second position state relative to the stationary track 201, wherein the first position state indicates that the moving track 202 retracts inside the stationary track 201; and the second position state indicates that the moving track 202 extends out of the stationary track 201. Exemplarily, the direction of retraction of the moving track 202 can be a circular direction indicated by the stationary track 201. The circular direction is determined by the closed circular track state formed by the unclosed circular track of the stationary track 201 and a virtual track, wherein the virtual track is an objectively non-existent track; it can be used to connect with the stationary track 201, thereby indicating the virtual state of the closed circular track.

[0128] For ease of understanding, one end of the moving rail 202 inside the stationary rail 201 is referred to as the first moving rail end, and the other end of the moving rail 202 is referred to as the second moving rail end; the port of the stationary rail 201 for the extension and retraction of the second moving rail end is referred to as the first stationary rail end, and the other end of the stationary rail 201 is referred to as the second stationary rail end.

[0129] In one embodiment, the second moving rail end may be provided with an operating handle 2043, which is used to drive the moving rail 202 from the first position state to the second position state when it is pulled. Exemplarily, the moving rail 202 switches between the first and second position states by moving along the annular direction.

[0130] In one embodiment, the first position state corresponds to the state where the alternative filter 10 is not used; the second position state corresponds to the state where the alternative filter 10 is used. For example, when the moving rail 202 is in the first position state, the alternative filter 10 is stationary on the stationary rail 201; when the moving rail 202 is in the second position state, the driving module 30 drives the alternative filter 10 to move on the annular track formed by the moving rail 202 and the stationary rail 201. For example, the annular track may coincide with the closed loop track formed by the stationary rail 201 and the virtual track.

[0131] In one embodiment, the first moving end of the moving rail 202 and the first stationary end of the stationary rail 201 can be connected by a spring; the spring is used to change the moving rail 202 from the second position state to the first position state. Thus, the spring force quickly pulls the second moving end of the moving rail 202 back to its initial position.

[0132] like Figure 4 As shown, this disclosure provides a helmet assembly. Wherein,

[0133] The guide rail 20 includes an upper rail 203 and a lower rail 204; the alternative filter is sandwiched between the upper rail 203 and the lower rail 204.

[0134] In one embodiment, the cross-sections of the upper rail 203 and the lower rail 204 can be crescent-shaped.

[0135] In one embodiment, a recessed groove may be provided on the side of the upper rail 203 opposite to the lower rail 204; the alternative filter 10 is located between the recessed grooves of the upper rail 203 and the lower rail 204.

[0136] In one embodiment, the inner cavity of the upper rail 203 may be provided with a rack 302 connected to the alternative filter 10. The upper rail 203 may also be provided with an opening, through which a gear 301 meshes with the rack 302. The drive motor 303 drives the alternative filter 10 to move within the annular area formed by the upper rail 203 and the lower rail 204 through the meshing of the gear 301 and the rack 302.

[0137] In one embodiment, the bottom of the alternative filter 10 is also inlaid with ball bearings 101, which facilitates the movement of the alternative filter 10 and reduces the friction between the alternative filter 10 and the lower rail 204.

[0138] like Figure 5 As shown, this disclosure provides a helmet assembly. Wherein,

[0139] The upper rail 203 is a fully annular structure, and the lower rail 204 is an unclosed annular structure; the two ends of the lower rail 204 are respectively provided with a component to be adsorbed and an adsorption component; the component to be adsorbed and the adsorption component are used to provide suction force to close the lower rail 204.

[0140] In one embodiment, the upper rail 203 may be higher than the lower rail 204. Exemplarily, the upper rail may be positioned at the visor portion of the helmet assembly (e.g.,...). Figure 3 As shown in the image, this way, it will not obstruct people's view.

[0141] In one embodiment, the lower rail 204 further includes the moving rail 202 and the stationary rail 201. One end of the stationary rail 201 and one end of the moving rail 202 may be respectively provided with a component to be adsorbed and an adsorption component. The component to be adsorbed and the adsorption component are used to provide suction force that makes the moving rail 202 and the stationary rail 201 form a closed loop.

[0142] In the first position, the lower rail 204 is an open ring structure, wherein the moving rail 202 is located inside the stationary rail 201; in the second position, the moving rail 202 extends out from the stationary rail 201, and one end of the moving rail 202 and one end of the stationary rail 201 are connected by the suction provided by the adsorption component 2042 and the adsorption component 2041.

[0143] In one embodiment, the first moving end of the moving rail 202 and the first stationary end of the stationary rail 201 can be connected by a spring; the spring is used to change the moving rail 202 from the second position state to the first position state. Thus, after the adsorption component 2042 is disconnected from the adsorption component 2041, the spring force quickly pulls the second moving end of the moving rail 202 back to the initial position.

[0144] For example, the adsorption component 2041 can be an electromagnet, and the component to be adsorbed 2042 is an electromagnet-adsorbable component. For example, the electromagnet-adsorbable component is nickel-iron, cobalt, etc. Thus, when the lower rail 204 needs to be retracted after use, it is only necessary to cut off the power supply to the electromagnet. After the power is de-energized, the moving rail 202 will automatically retract into the stationary rail 201 under the action of the spring, thereby achieving the retraction of the moving rail 202.

[0145] like Figure 5 As shown, this disclosure provides a helmet assembly. The helmet assembly includes:

[0146] Helmet size 70, operating rope size 606;

[0147] The helmet body 70 is equipped with a dimmable glass control unit 60, which includes a bracket 601 and a bracket guide groove 602.

[0148] The bracket 601 is equipped with: a dimmable glass 50, a bracket positioning post 603, a helmet positioning post 604, and a positioning post guide groove 605.

[0149] The bracket 601 is installed between the bracket guide grooves 602, and the bracket guide grooves 602 are used to guide the direction of movement of the bracket 601 and the dimmable glass 50 on the bracket 601.

[0150] The helmet positioning post 604 passes through the positioning post guide groove 605 and is fixed on the helmet 70;

[0151] The operating rope 606 is wound between the helmet positioning post 604 and the bracket positioning post 603; by pulling the operating rope 606, the operating rope 606 between the bracket positioning post 603 and the helmet positioning post 604 contracts, thereby driving the bracket 601 where the bracket positioning post 603 is located to move.

[0152] In one embodiment, the dimmable glass 50 is made of a dimmable material, for example, the dimmable material is a cloud adhesive; or, a liquid crystal film is provided in the dimmable glass 50 shown.

[0153] In one embodiment, the tunable glass 50 may be made of PDLC film material. The PDLC film is used to switch the tunable glass 50 between transparent and opaque states, which indicate whether light can pass through or not. For example, the PDLC film is a giant parallel-plate capacitor, which can be used to control the polar liquid crystal molecules in the tunable glass 50 to be oriented or randomly arranged, thereby switching between transparent and opaque states.

[0154] For example, in the transparent state, the surrounding environment can be seen through the dimmable glass 50; in the shaded state, the surrounding environment cannot be seen through the dimmable glass 50.

[0155] In one embodiment, if the drive module 30 does not drive the target filter to move to the predetermined position, the dimmable glass 50 can be located in the upper middle part of the helmet body 70, so as not to affect the daily use of the helmet assembly.

[0156] In one embodiment, the helmet assembly may include two bracket guide slots 602, with the bracket 601 mounted between the two bracket guide slots 602; the bracket guide slots 602 are vertical empty slots used to guide the bracket 601 and the dimmable glass 50 on the bracket 601 to move up and down.

[0157] For example, when the dimmable glass 50 is located in the upper middle part of the helmet body 70, the dimmable glass 50 is in a shielded state. Thus, when the dimmable glass 50 moves downwards, there is no need to spend time switching from a transparent state to a shielded state, avoiding eye injury during the switching time. Instead, it is pre-set to be in a shielded state, directly blocking potentially harmful light.

[0158] In one embodiment, the guide rail 20 includes a lower rail 204, which is an open rail; one end of the lower rail 204 is connected to the operating rope 606, and when the lower rail 204 is turned into a closed state, it drives the operating rope 606 to move.

[0159] In one embodiment, the lower rail 204 includes a moving rail 202 and a stationary rail 201, and a handle 2043 is provided on the second moving rail end of the moving rail 202 (e.g., ...). Figure 5 As shown, the operating rope 606 is connected to the handle 2043; when the handle 2043 moves with the moving rail 202, the operating rope 606 is driven to move with the handle 2043.

[0160] In one embodiment, the second moving rail end of the moving rail 202 may also be provided with a retractable operating rope tube. The operating rope 606 passes through the retractable operating rope tube 2044 and is connected to the handle 2043. Thus, when the second moving rail end moves, the retractable operating rope tube 2044 extends, forming an arc-shaped guide tube similar in shape to the moving rail 202, preventing the retractable rope from being pulled horizontally in front of the person's eyes as the second moving rail end moves, thereby obstructing the person's view.

[0161] In this embodiment, by providing a plurality of support positioning posts 603 and support guide grooves 602 on the support 601 where the dimmable glass 50 is located, and simultaneously providing a helmet positioning post in the support guide groove 602, the support 601 can move under the action of the helmet positioning post. A control rope 606 is connected between the helmet positioning post and the support positioning post 603, and the control rope 606 is connected to a handle 2043 at the second moving rail end of the moving rail 202. When the second moving rail end moves, the control rope 606 can be pulled to move along with the moving rail 202, and the rope between the support positioning post 603 and the helmet positioning post 604 will contract, thereby driving the support 601 and the dimmable glass 50 on the support 601 to move downwards.

[0162] Here, the up-and-down sliding structure of the dimmable glass 50 and the annular movement of the alternative filter 10 on the annular guide rail make the layout of the helmet assembly in the thickness direction more compact, allowing the helmet to be designed to be thinner, with more dispersed force, and lighter.

[0163] In this embodiment, when aggressive light rays enter the range of the human eye, the dimmable glass 50 can act as a temporary blocking component to block the aggressive light rays. Once the target filter has moved to a predetermined position, the dimmable glass 50 is switched to a transparent state, allowing normal observation of the outside world. Thus, even during the switching between multiple alternative filter sheets 10, the eyes can still be protected from the harmful light rays.

[0164] like Figure 5As shown, this disclosure provides a helmet assembly. The bracket guide groove 602 further includes a groove handle 607; the helmet assembly also includes a return spring 608; the return spring 608 is located between the groove handle 607 and the bracket 601; and is used to drive the bracket 601 back to its initial position when it has not moved.

[0165] In one embodiment, after the second moving end of the moving rail 202 is connected to the second stationary end of the stationary rail 201, the moving rail 202 changes from a first position state to a second position state. The second moving end of the moving rail 202 drives the operating rope 606 to move. The operating rope 606 overcomes the upward force of the reset spring 608 and drives the bracket 601 and the dimmable glass 50 on the bracket 601 to move downward to a predetermined position.

[0166] In one embodiment, after the second moving end of the moving rail 202 is disconnected from the second stationary end of the stationary rail 201, the moving rail 202 returns to the first position, and the operating rope 606 connected to the second moving end of the moving rail 202 is retracted to its original position. At this time, under the upward force of the return spring 608, the bracket 601 and the dimmable glass 50 on the bracket 601 are driven to move upward to the initial position.

[0167] Thus, when the moving rail 202 is reset, the bracket 601 is also reset under the action of the reset spring 608, making the reset of the helmet assembly convenient and fast.

[0168] In this embodiment, the support 601 and the dimmable glass 50 on the support 601 are driven to move downward by the pulling of the telescopic rope 606 connected to the moving rail. The extension of the moving rail 202 and the sliding of the dimmable glass 50 are both integrated and linked. That is, when the moving rail 202 aligns with the stationary rail 201, the dimmable glass 50 slides down as the moving rail 202 aligns with the stationary rail 201. When the moving rail 202 resets, the support 601 also resets under the action of the reset spring 608, making the reset of the helmet assembly convenient and fast.

[0169] In order to implement the method of the present disclosure, the present application also provides a light protection device, which corresponds to the above-described light protection method. The steps in the above-described light protection method embodiment are also fully applicable to the light protection device embodiment.

[0170] The device includes a determining module, configured to: determine whether the power of the detected light is greater than a power threshold; if the power is greater than the power threshold, determine a target filter for protection from candidate filter filters based on predetermined parameters and a mapping relationship between the predetermined parameters and filter types; wherein the predetermined parameters include at least one of the optical density value of the filter, the usage parameters of the filter, and the wavelength value of the light.

[0171] In one embodiment, the device further includes a filtering module for filtering out the light used for detection from ambient light.

[0172] This embodiment also provides a processing device, the processing device comprising:

[0173] A processor and memory for storing computer programs that can run on the processor, wherein,

[0174] The processor is used to implement the light protection method described in any of the embodiments of this disclosure when running a computer program.

[0175] It is understood that memory can be volatile or non-volatile, or both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), ferromagnetic random access memory (FRAM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM); magnetic surface memory can be disk storage or magnetic tape storage. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), SyncLink Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM).The memories described in the embodiments of this application are intended to include, but are not limited to, these and any other suitable types of memories.

[0176] The light protection method disclosed in this disclosure can be applied to or implemented by the processor. The processor can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the light protection method can be completed by integrated logic circuits in the processor's hardware or by software instructions. The processor can be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor can implement or execute the methods, steps, and logic block diagrams disclosed in this disclosure. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this disclosure can be directly represented as being executed by a hardware decoding processor, or as being executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in a storage medium, specifically a memory. The processor reads information from the memory and, in conjunction with its hardware, completes the steps of the light protection method provided in this application.

[0177] In exemplary embodiments, this disclosure also provides a storage medium, namely a computer storage medium, specifically a computer-readable storage medium, such as a memory that stores a computer program, which can be executed by a processor of a processing device to complete the steps described in the methods of this application. The computer-readable storage medium may be a ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM, etc.

[0178] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

[0179] It should be noted that terms such as "first" and "second" are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0180] Furthermore, the technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0181] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for protecting against light, characterized in that, The method includes: Determine whether the power of the detected light is greater than the power threshold; If the power is greater than the power threshold, a target filter for protection is determined from the candidate filter filters according to predetermined parameters and the mapping relationship between the predetermined parameters and the filter type; wherein, the predetermined parameters include: the optical density value of the filter and the wavelength value of the light; The step of determining the target filter for protection from candidate filter films based on predetermined parameters and the mapping relationship between the predetermined parameters and the filter film type includes: If at least two types of filter films are determined from the candidate filter films based on the wavelength value of the detected light and the mapping relationship, the optical density values ​​of the at least two types of filter films are compared to determine the target filter film from the at least two types of filter films. The wavelength of the detected light is within the protection range of the at least two types of filter films.

2. The light protection method according to claim 1, characterized in that, Before determining whether the power of the detected light is greater than a power threshold, the method further includes: The light used for detection is filtered out from the ambient light.

3. A helmet assembly, characterized in that, The helmet assembly includes: Alternative filter films; Guide rails are used to support multiple of the alternative filter plates; A drive module is used to drive the alternative filter to move on the guide rail; A control module, connected to the drive module, is configured to: determine a target filter for protection from candidate filter films based on predetermined parameters and a mapping relationship between the predetermined parameters and the filter film type; wherein the predetermined parameters include: the optical density value of the filter film and the wavelength value of the light; and control the drive module to drive the target filter film to move to a predetermined position. The step of determining the target filter for protection from candidate filter films based on predetermined parameters and the mapping relationship between the predetermined parameters and filter film types includes: when at least two types of filter films are determined from the candidate filter films based on the wavelength value of detected light and the mapping relationship, comparing the optical density values ​​of the at least two types of filter films to determine the target filter film from the at least two types of filter films; wherein the wavelength value of the detected light is within the protection range of the at least two types of filter films.

4. The helmet assembly according to claim 3, characterized in that, The guide rail includes a stationary rail and a moving rail connected to the stationary rail; the control module controls the alternative filter to move in a closed loop on the stationary rail and the moving rail; the moving rail has a first position state and a second position state relative to the stationary rail; the first position state corresponds to the state where the alternative filter is not used; the second position state corresponds to the state where the alternative filter is used.

5. The helmet assembly according to claim 3, characterized in that, The guide rail includes an upper rail and a lower rail; the alternative filter is sandwiched between the upper rail and the lower rail.

6. A helmet assembly according to claim 5, characterized in that, The upper rail is a fully annular structure, and the lower rail is an open annular structure; the two ends of the lower rail are respectively provided with a component to be adsorbed and an adsorption component; the component to be adsorbed and the adsorption component are used to provide suction force to close the lower rail.

7. A helmet assembly according to claim 3, characterized in that, The helmet assembly also includes: a helmet body and an operating rope; The helmet is equipped with a dimmable glass control unit. The dimmable glass control unit includes: a bracket and a bracket guide groove; The bracket is equipped with: a dimmable glass, a bracket positioning post, a helmet positioning post, and a positioning post guide groove; The bracket is installed between the bracket guide grooves, and the bracket guide grooves are used to guide the direction of movement of the bracket and the dimmable glass on the bracket; The helmet positioning post passes through the positioning post guide groove and is fixed to the helmet body; The operating rope is wound between the helmet positioning post and the bracket positioning post; by pulling the operating rope, the operating rope between the bracket positioning post and the helmet positioning post contracts, thereby driving the bracket where the bracket positioning post is located to move.

8. The helmet assembly according to claim 7, characterized in that, The bracket guide groove further includes a groove handle; the helmet assembly further includes a return spring; the return spring is located between the groove handle and the bracket; and is used to drive the bracket to return to its initial position when it has not moved.

9. A light protection device capable of implementing the method described in any one of claims 1-2, characterized in that, The device includes: The determining module is configured to: determine whether the power of the detected light is greater than a power threshold; if the power is greater than the power threshold, determine a target filter for protection from candidate filter filters according to predetermined parameters and the mapping relationship between the predetermined parameters and the filter type; wherein the predetermined parameters include at least one of the optical density value of the filter, the usage parameters of the filter, and the wavelength value of the light.

10. The apparatus according to claim 9, characterized in that, The device further includes: A filtering module is used to filter out the light used for detection from ambient light.

11. A processing apparatus, characterized in that, include: A processor and memory for storing computer programs that can run on the processor, wherein, The processor, when running a computer program, performs the steps of the method according to any one of claims 1 to 2.

12. A storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 2.

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