A sky light

Abstract

The application provides a sky lamp, comprising the following components: a plurality of light source modules arranged linearly along a first direction, the light source module comprising a light source emitting initial light and a lens receiving the initial light to form uniform light; an incident surface of a Rayleigh scatter element is parallel to the first direction and the uniform light is obliquely incident on the incident surface; the Rayleigh scatter element is used for transmitting and Rayleigh scattering the uniform light; the lens comprises opposite light-incident surfaces and a light-emitting surface and is divided into four regions, the initial light forms uniform light with uniform light intensity in the first direction after passing through the second region and the fourth region opposite along the first direction; the first region and the third region are opposite along a second direction parallel to the light-emitting surface and perpendicular to the first direction, the initial light forms uniform light with uniform light intensity in the second direction after being polarized by the first region and the third region. The sky lamp provided by the application can not only achieve a more uniform blue sky lighting effect, but also is more conducive to reducing the thickness of the sky lamp.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of lighting devices, and more particularly relates to a sky lamp. BACKGROUND

[0002] At present, as a new type of lamp capable of simulating sunlight irradiation and a blue sky scene, the blue sky lamp can not only emit light similar to sunlight and irradiate on a wall or a floor to form an illumination spot, but also can present a blue sky scene by using special Rayleigh scattering, so that people in the room can feel as if they are in an outdoor environment with sunlight irradiation, that is, they can experience a feeling of being connected with the outdoor space and effectively enhance the extension of the indoor space, thereby effectively solving the adverse emotional impact of people who cannot go outdoors in foggy and rainy weather, and making the indoor personnel feel more cheerful. However, the sky lamp on the market has the problems of relatively thick thickness and uneven light intensity due to the problems in the design of the light path, and needs to be further improved. SUMMARY

[0003] The purpose of the embodiment of the application is to provide a sky lamp to solve the technical problems of uneven light intensity and relatively thick thickness of the sky lamp in the prior art.

[0004] To achieve the above purpose, the technical solution adopted by the application is to provide a sky lamp, comprising:

[0005] a plurality of light source modules arranged linearly along a first direction, each of the light source modules comprising a light source and a lens arranged on the light emission side of the light source; the light source is used for emitting initial light, and the lens is used for receiving the initial light to form uniform light; and

[0006] a Rayleigh scattering element having an incident surface for receiving the uniform light, the incident surface being parallel to the first direction and the uniform light being obliquely incident on the incident surface; the Rayleigh scattering element is used for transmitting and Rayleigh scattering the uniform light;

[0007] The lens comprises oppositely arranged light incident surfaces and light emission surfaces, and the lens is divided into a first region, a second region, a third region and a fourth region; the second region and the fourth region are oppositely arranged along the first direction, and the initial light forms uniform light with uniform light intensity in the first direction after passing through the second region and the fourth region; in a second direction parallel to the light emission surface and perpendicular to the first direction, the first region and the third region are opposite to each other and are both arranged in a polarized manner, and the initial light forms uniform light with uniform light intensity in the second direction after being polarized by the first region and the third region.

[0008] Optionally, the lens is arranged in a shape gradually expanding in the light-out direction, the lens is provided with a receiving groove, the light source is built in the receiving groove, the inner wall of the receiving groove forms the light-in surface, the light-out surface is arranged in a plane, and the lens further comprises a total reflection surface connecting the light-in surface and the light-out surface;

[0009] The light-in surface comprises a first refractive surface, a second refractive surface, a third refractive surface and a fourth refractive surface, the first refractive surface and the third refractive surface are oppositely arranged along the second direction, and the second refractive surface and the fourth refractive surface are oppositely arranged along the first direction; the total reflection surface comprises a first reflection surface, a second reflection surface, a third reflection surface and a fourth reflection surface, the first reflection surface and the third reflection surface are oppositely arranged along the second direction, and the second reflection surface and the fourth reflection surface are oppositely arranged along the first direction;

[0010] The first region comprises the first refractive surface and the first reflection surface; the second region comprises the second refractive surface and the second reflection surface; the third region comprises the third refractive surface and the third reflection surface; and the fourth region comprises the fourth refractive surface and the fourth reflection surface.

[0011] Optionally, the first refractive surface and the third refractive surface are asymmetrically arranged relative to the central axis of the lens in the second direction, and the first reflection surface and the third reflection surface are also asymmetrically arranged relative to the central axis of the lens in the second direction.

[0012] Optionally, the first refractive surface comprises a first refractive top region opposite to the light source and a first refractive side region adjacent to the first refractive top region and located on the side of the light source; and the third refractive surface comprises a third refractive top region opposite to the light source and a third refractive side region adjacent to the third refractive top region and located on the side of the light source.

[0013] The light-in surface is divided into a far-end light-in region, a middle light-in region and a near-end light-in region, and the distances between the light source module and the far-end light-in region, the middle light-in region and the near-end light-in region decrease in turn.

[0014] Part of the initial light rays are incident to the far-end light-in region after being refracted by the first refractive side region and reflected by the first reflection surface in turn; part of the initial light rays are incident to the middle light-in region after being refracted by the first refractive top region and the third refractive top region; part of the initial light rays are incident to the near-end light-in region after being refracted by the third refractive side region and reflected by the third reflection surface; and the illumination intensities on the far-end light-in region, the middle light-in region and the near-end light-in region are equal.

[0015] Optionally, the first reflection surface is an outwardly convex arc surface, and the first reflection surface is arranged such that the farther from the light source, the more light rays are reflected; and the illumination intensities of the uniform light rays incident to the far-end light-in region are equal.

[0016] Optionally, the second reflection surface and the fourth reflection surface are symmetrically arranged relative to the central axis of the lens in the first direction; and the second refractive surface and the fourth refractive surface are symmetrically arranged relative to the central axis of the lens in the first direction.

[0017] Optionally, the initial light is refracted by the second refractive surface and reflected by the second reflective surface, and is refracted by the fourth refractive surface and reflected by the fourth reflective surface, and forms collimated uniform light which is perpendicular to the light-emitting surface and parallel to the central axis of the lens.

[0018] Optionally, the light-emitting surface is further provided with a plurality of stripe-shaped protrusions, and the protrusions are arranged in the second direction.

[0019] Optionally, the plurality of stripe-shaped protrusions are uniformly distributed in the first direction.

[0020] Optionally, the Rayleigh scattering member is in the shape of a plate, the first direction is parallel to the plate surface of the Rayleigh scattering member, and the Rayleigh scattering member is located obliquely below the light source module; and the plurality of light source modules are uniformly arranged in the first direction.

[0021] The sky lamp provided by the application has the beneficial effects that, compared with the prior art, the sky lamp of the application achieves the purpose of reducing the thickness of the lamp by tilting the light source module beside the Rayleigh scattering member. Meanwhile, the light source module is functionally divided into different regions, and the light is designed to be polarized in the second direction in the first region and the third region of the lens, so that the light is distributed in a specific manner, and thus the Rayleigh scattering plate can obtain a blue sky effect with uniform brightness. In other words, the sky lamp of the application has the advantages of thin thickness and uniform brightness. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 The structure perspective view of the sky lamp provided by an embodiment of the application;

[0024] Figure 2 The structure schematic view of the lens of the light source module of the sky lamp provided by an embodiment of the application;

[0025] Figure 3 The light path schematic view of the sky lamp provided by an embodiment of the application when the light source module is divided into regions and irradiated to the Rayleigh scattering member;

[0026] Figure 4 The light path schematic view of the light source module irradiated to the proximal end of the Rayleigh scattering member;

[0027] Figure 5 FIG. 6 is a schematic diagram of a light path of a lens in a light source module of a sky lamp according to an embodiment of the present application along a second direction;

[0028] Figure 6 FIG. 7 is a schematic diagram of a light path of a lens in a light source module of a sky lamp according to an embodiment of the present application along a first direction;

[0029] Figure 7 FIG. 8 is a schematic diagram of a structure of a lens in a light source module of a sky lamp according to another embodiment of the present application from another angle;

[0030] Figure 8 FIG. 9 is a schematic diagram of a light path of a lens in a light source module of a sky lamp according to another embodiment of the present application along a first direction.

[0031] BRIEF DESCRIPTION OF THE DRAWINGS

[0032]

[0033] DETAILED DESCRIPTION

[0034] In order to make the technical problems solved by the present application, the technical solutions and the beneficial effects clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should also be noted that the terms of left, right, up and down in the embodiments of the present application are only relative concepts or are referenced to the normal use state of the product, and should not be considered as limiting.

[0037] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, in which the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be considered as limiting the present application.

[0038] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate directions or positions based on the directions or positions shown in the drawings, and are used for convenience of description and simplification of description only, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0039] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0040] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0041] The embodiment of the present application provides a sky lamp.

[0042] Please refer to Figures 1 to 3 and Figure 5 In an embodiment, the sky lamp comprises a plurality of light source modules 100 and a Rayleigh scattering element 200. Wherein, as Figure 1As shown, the plurality of light source modules 100 are arranged linearly along a first direction, each of the light source modules 100 includes a light source 110 and a lens 120 arranged on a light emitting side of the light source 110, the lens 120 includes oppositely arranged light incident surface 125 and light emitting surface 126; the light source 110 is used to emit initial light, and the lens 120 is used to receive the initial light to form uniform light. The Rayleigh scattering element 200 has an incident surface 210 for receiving the uniform light, the incident surface 210 is parallel to the first direction and the uniform light is obliquely incident on the incident surface 210; the Rayleigh scattering element 200 is used to transmit and Rayleigh scatter the uniform light. Here, in order to improve the problem of weak light intensity at a distance caused by the oblique arrangement of the light source 110 beside the Rayleigh scattering element 200, the lens 120 can be divided into a first region 121, a second region 122, a third region 123 and a fourth region 124; the second region 122 and the fourth region 124 are oppositely arranged along the first direction, and the initial light forms uniform light with uniform light intensity in the first direction after passing through the second region 122 and the fourth region 124; in a second direction parallel to the light emitting surface 126 and perpendicular to the first direction, the first region 121 and the third region 123 are opposite and each is arranged in a polarized manner, and the initial light forms uniform light with uniform light intensity in the second direction after being polarized by the first region 121 and the third region 123.

[0043] It should be noted that the sky lamp is a lamp capable of producing a uniform blue sky light spot, and the lighting effect is based on Rayleigh scattering. Rayleigh scattering, also known as "molecular scattering", is a special scattering phenomenon. When the particle size is much smaller than the wavelength of the incident light (less than one tenth of the wavelength), the scattering intensity in each direction is not the same, and the intensity is proportional to the fourth power of the frequency of the incident light. Therefore, more blue light is scattered, and a blue sky scene is presented. The Rayleigh scattering member 200 uses the principle of Rayleigh scattering to add a certain amount of scattering particles in optical plastics, optical glasses and other materials, increasing the scattering of blue light. That is, the short-wavelength light in the light is scattered by the Rayleigh scattering member 200, so that the light emitting surface of the sky lamp presents a light emitting effect similar to the scene of a blue sky. At the same time, the long-wavelength light in the light can pass through the Rayleigh scattering member 200 to present a lighting light spot similar to sunlight on the wall or floor. Here, the light source 110 is usually preferably an environmentally friendly and efficient LED light source. The light spectrum of the LED light source is a white light spectrum including high color temperature and low color temperature, and of course can be one or a combination of a plurality of light spectrum light sources. In addition, the sky lamp also includes a shell 300 and a light bar substrate 130. The light source module 100 and the Rayleigh scattering member 200 are installed in the inner cavity of the shell 300, and the light bar substrate 130 is fixed on the inner side wall of the shell 300. The length extension direction of the light bar substrate 130 is the first direction, and a plurality of LEDs are fixed on the light bar substrate 130 in a linear interval. The end of the lens 120 away from the Rayleigh scattering member 200 is also fixed on the light bar substrate 130 through the corresponding support.

[0044] Based on the structure design, the sky lamp of the present application is inclined to the side of the Rayleigh scattering member 200 to reduce the thickness of the lamp. At the same time, the lens 120 in the light source module 100 is functionally divided, and the polarization design in the second direction of the first area 121 and the third area 123 of the lens 120 is used to make the light have a specific distribution. In this way, the light intensity at a position far from the light source 110 on the Rayleigh scattering plate is consistent with that at a position close to the light source 110, so that the Rayleigh scattering plate can present a blue sky effect with uniform brightness. In other words, the sky lamp in the present application has the advantages of thin thickness and uniform brightness.

[0045] For details, please refer to Figure 2 、 Figures 5 to 7In an embodiment, the lens 120 is arranged in a shape gradually expanding along the light-out direction, the lens 120 is provided with a receiving groove 140, the light source 110 is built in the receiving groove 140, the inner wall of the receiving groove 140 forms the light-in surface 125, the light-out surface 126 is arranged in a plane, and the lens 120 further comprises a total reflection surface 127 connecting the light-in surface 125 and the light-out surface 126, i.e. the lens 120 in this embodiment is a TIR (Total Internal Reflection) lens. It is also particularly pointed out that the material for manufacturing the lens 120 should be an optical plastic or optical glass resistant to high temperature, and the material quality thereof should be resistant to a temperature greater than 120 degrees Celsius.

[0046] Further subdivision, the light-in surface 125 comprises a first refractive surface 125a, a second refractive surface 125b, a third refractive surface 125c and a fourth refractive surface 125d, the first refractive surface 125a and the third refractive surface 125c are oppositely arranged along the second direction, and the second refractive surface 125b and the fourth refractive surface 125d are oppositely arranged along the first direction; the total reflection surface 127 comprises a first reflection surface 127a, a second reflection surface 127b, a third reflection surface 127c and a fourth reflection surface 127d, the first reflection surface 127a and the third reflection surface 127c are oppositely arranged along the second direction, and the second reflection surface 127b and the fourth reflection surface 127d are oppositely arranged along the first direction. The first region 121 comprises the first refractive surface 125a and the first reflection surface 127a; the second region 122 comprises the second refractive surface 125b and the second reflection surface 127b; the third region 123 comprises the third refractive surface 125c and the third reflection surface 127c; and the fourth region 124 comprises the fourth refractive surface 125d and the fourth reflection surface 127d. Here, if the first direction is the horizontal direction, the second direction is the vertical direction, the second region 122 and the fourth region 124 are distributed in the horizontal direction, the first region 121 and the third region 123 are distributed in the vertical direction, and the lens 120 has a polarized design in the vertical direction. In this way, through the refractive and reflective effects in different regions, the uniformity of the light intensity in the horizontal and vertical directions can be achieved.

[0047] Please refer to Figures 3 to 5 In an embodiment, the first refractive surface 125a and the third refractive surface 125c are asymmetrically arranged relative to the central axis of the lens 120 in the second direction, and the first reflection surface 127a and the third reflection surface 127c are also asymmetrically arranged relative to the central axis of the lens 120 in the second direction. In this way, through this asymmetric TIR lens design in the second direction, i.e. the vertical direction, the light rays incident by the light source 110 can be redistributed, achieving the optical effect of uniform light intensity.

[0048] Please refer to Figures 2 to 5In an embodiment, the first refractive surface 125a comprises a first refractive top region 125a1 opposite to the light source 110 and a first refractive side region 125a2 adjacent to the first refractive top region 125a1 and beside the light source 110; the third refractive surface 125c comprises a third refractive top region 125c1 opposite to the light source 110 and a third refractive side region 125c2 adjacent to the third refractive top region 125c1 and beside the light source 110.

[0049] Further, in order to achieve a better polarization design in the second direction, i.e. the longitudinal direction, and to obtain a better light distribution, as shown in Figure 3 and Figure 4 the incident surface 210 can be divided into a distal incident region 211, a middle incident region 212 and a proximal incident region 213, and the distances between the light source module 100 and the distal incident region 211, the middle incident region 212 and the proximal incident region 213 decrease in turn; part of the initial light rays are incident to the distal incident region 211 after being refracted by the first refractive side region 125a2 and reflected by the first reflecting surface 127a in turn; part of the initial light rays are incident to the middle incident region 212 after being refracted by the first refractive top region 125a1 and the third refractive top region 125c1; part of the initial light rays are incident to the proximal incident region 213 after being refracted by the third refractive side region 125c2 and reflected by the third reflecting surface 127c; the illumination intensities on the distal incident region 211, the middle incident region 212 and the proximal incident region 213 are equal.

[0050] As shown in Figure 3 the target illumination region, i.e. the incident surface 210 of the Rayleigh scatter element 200, is divided into three parts, i.e. the distal incident region 211, the middle incident region 212 and the proximal incident region 213, along the width direction of the incident surface 210, and then the light distribution is controlled by the aforementioned refractive regions and reflecting surfaces. For example, the light rays within a range of 60 degrees enter the lens 120 after being refracted by the first refractive side region 125a2, and then the light rays can be controlled by the first reflecting surface 127a to be incident to the distal incident region 211 located at the distal end, so as to strengthen the illumination intensity at the distal end. Similarly, the light rays within a range of 75 degrees enter the lens 120 after being refracted by the first refractive top region 125a1 and the third refractive top region 125c1, and then the light rays are incident to the middle incident region 212 from the light exit surface 126. The light rays within a range of 45 degrees enter the lens 120 after being refracted by the third refractive side region 125c2, and then the light rays can be controlled by the third reflecting surface 127c to be incident to the proximal incident region 213 located at the proximal end. Of course, in other embodiments, the division of the regions and the limitation of the angle range can be set according to actual conditions, which are not particularly limited herein.

[0051] Herein, the light redistribution of the lens 120 should follow the principle of equal illumination, which follows the following formula: if the included angle between the central light ray and the inclined light ray is θ, then the illumination intensity of the inclined light ray on the same plane is Eθ When the equal illumination, E θ = E0.

[0052]

[0053] wherein I0 is the central light intensity, E0 is the central illumination, h is the central distance,

[0054] Please refer to Figures 2 to 5 In an embodiment, the first reflecting surface 127a is an outward convex arc surface, and the first reflecting surface 127a is arranged to reflect more light at a position farther from the light source 110, so that the light intensity of the uniform light incident on the far end incident area 211 is equal. It can be understood that according to the equal illumination principle, more light is needed to maintain the light intensity consistent at the far end, and the outward convex arc surface of the first reflecting surface 127a can make the first reflecting surface 127a reflect more light at a position farther from the light source 110. Here, the coordinates of the points of the full reflecting surface 127 (including the first reflecting surface 127a, the second reflecting surface 127b, the third reflecting surface 127c, and the fourth reflecting surface 127d) can be calculated according to the light intensity of the target area. As shown in Figure 5 OA is the initial light, AB is the first refracted light after the third refractive side area 125c2, BC is the first reflected light after the third reflecting surface 127c, and CD is the second refracted light after the first reflected light is refracted by the lens 120 and emitted from the light emitting surface 126. Here, the light angle of each area can be divided into N units, for example, the 45-degree light of the third reflecting surface 127c is divided into 1000 unit angles at equal angles, that is, each unit angle is 45 / 1000 degrees. Then the first incident angle is θ1=0°, the second incident angle is θ2=0.045°, and so on. According to the equal illumination principle, more light is needed to maintain the light intensity consistent at a farther position, and thus the coordinates of the points of the reflecting surface can be obtained, thereby fitting a curve. Similarly, the coordinates of the points of other refractive surfaces and reflecting surfaces can also be obtained according to the same method.

[0055] In an embodiment, the second reflecting surface 127b and the fourth reflecting surface 127d are symmetrically arranged relative to the central axis of the lens 120 in the first direction; the second refractive surface 125b and the fourth refractive surface 125d are symmetrically arranged relative to the central axis of the lens 120 in the first direction. Further, please refer to Figure 6 In an embodiment, the initial light is refracted by the second refractive surface 125b and reflected by the second reflecting surface 127b, and is refracted by the fourth refractive surface 125d and reflected by the fourth reflecting surface 127d, forming collimated uniform light perpendicular to the light emitting surface 126 and parallel to the central axis of the lens 120. In this way, the uniformity of the light intensity in the first direction can be better achieved.

[0056] Referring to Figure 1 In an embodiment, the Rayleigh scattering member 200 is in a plate shape, the first direction is parallel to the plate surface of the Rayleigh scattering member 200, and the Rayleigh scattering member 200 is located obliquely below the light source module 100. In this way, the thickness of the sky lamp can be reduced, and the multiple light source modules 100 are uniformly spaced in the first direction, which is also conducive to further improving the uniformity of the light intensity in the first direction. In this embodiment, the Rayleigh scattering member 200 is specifically in a rectangular plate shape, and the lamp strip substrate 130 is parallel to the long side thereof. Of course, in other embodiments, the structure and shape of the Rayleigh scattering member 200 are not limited thereto, and can be set according to the actual specific shape, and can be but not limited to square, circular, elliptical, etc.

[0057] Referring to Figure 7 and Figure 8 In another embodiment, the light exit surface 126 is further provided with a plurality of stripe-shaped protrusions 128, and the protrusions 128 are arranged in the second direction. It can be understood that when the light exit surface 126 of the lens 120 is provided with a plurality of stripe-shaped protrusions 128, the collimated light rays emitted from the lens 120 are refracted by the stripe-shaped protrusions 128, and become the cross light rays as shown in Figure 8 , which can increase the exit range of the light rays and improve the uniformity of the light intensity. Here, as shown in Figure 8 , the multiple stripe-shaped protrusions are preferably uniformly distributed in the first direction, which is conducive to further improving the uniformity of the light intensity and making the sky lamp have better lighting effect.

[0058] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sky light, characterized in that The sky lamp comprises: a plurality of light source modules arranged linearly along a first direction, each of the light source modules comprising a light source and a lens arranged on a light emitting side of the light source, the light source being configured to emit initial light, and the lens being configured to receive the initial light to form uniform light; a Rayleigh scattering element having an incident surface configured to receive the uniform light, the incident surface being parallel to the first direction and the uniform light being obliquely incident on the incident surface, and the Rayleigh scattering element being configured to transmit and Rayleigh scatter the uniform light; wherein the lens comprises oppositely arranged light incident and light emitting surfaces, and the lens is divided into a first region, a second region, a third region and a fourth region, the second region and the fourth region being oppositely arranged along the first direction, and the initial light passing through the second region and the fourth region forms the uniform light with uniform illumination intensity in the first direction; in a second direction parallel to the light emitting surface and perpendicular to the first direction, the first region and the third region are oppositely arranged and each is arranged to be polarized, and the initial light passing through the first region and the third region forms the uniform light with uniform illumination intensity in the second direction; the lens is arranged in a shape gradually expanding along the light emitting direction, the lens is provided with a receiving groove, the light source is arranged in the receiving groove, an inner wall of the receiving groove forms the light incident surface, the light emitting surface is arranged in a plane, and the lens further comprises a total reflection surface connecting the light incident surface and the light emitting surface; the light incident surface comprises a first refractive surface, a second refractive surface, a third refractive surface and a fourth refractive surface, the first refractive surface and the third refractive surface are oppositely arranged along the second direction, and the second refractive surface and the fourth refractive surface are oppositely arranged along the first direction; the total reflection surface comprises a first reflection surface, a second reflection surface, a third reflection surface and a fourth reflection surface, the first reflection surface and the third reflection surface are oppositely arranged along the second direction, and the second reflection surface and the fourth reflection surface are oppositely arranged along the first direction; the first region comprises the first refractive surface and the first reflection surface, the second region comprises the second refractive surface and the second reflection surface, the third region comprises the third refractive surface and the third reflection surface, and the fourth region comprises the fourth refractive surface and the fourth reflection surface; the first refractive surface and the third refractive surface are asymmetrically arranged relative to a central axis of the lens in the second direction, and the first reflection surface and the third reflection surface are also asymmetrically arranged relative to the central axis of the lens in the second direction; wherein the sky lamp further comprises a housing and a light bar substrate, the light source modules and the Rayleigh scattering element are arranged in an inner cavity of the housing, and the light bar substrate is fixed to an inner side wall of the housing. the first refractive surface comprises a first refractive top region opposite to the light source and a first refractive side region adjacent to the first refractive top region and located beside the light source, and the third refractive surface comprises a third refractive top region opposite to the light source and a third refractive side region adjacent to the third refractive top region and located beside the light source.

2. The sky light of claim 1, wherein ​ The incident surface is divided into a distal incident area, a middle incident area and a proximal incident area, and the distances between the light source module and the distal incident area, the middle incident area and the proximal incident area are sequentially decreased. Part of the initial light is incident to the distal incident area after being refracted by the first refractive side area and reflected by the first reflecting surface; part of the initial light is incident to the middle incident area after being refracted by the first refractive top area and the third refractive top area; part of the initial light is incident to the proximal incident area after being refracted by the third refractive side area and reflected by the third reflecting surface; and the illumination intensity on the distal incident area, the middle incident area and the proximal incident area is equal.

3. The sky light of claim 2, wherein The first reflecting surface is an outward convex arc surface, and the first reflecting surface is arranged to reflect more light at a position farther from the light source, and the uniform light incident on the distal incident area has equal illumination intensity.

4. The sky light of claim 1, wherein The second reflecting surface and the fourth reflecting surface are symmetrically arranged relative to the central axis of the lens in the first direction; and the second refractive surface and the fourth refractive surface are symmetrically arranged relative to the central axis of the lens in the first direction.

5. A sky light as claimed in claim 4, characterized in that The initial light is refracted by the second refractive surface and reflected by the second reflecting surface, and is refracted by the fourth refractive surface and reflected by the fourth reflecting surface, and both form the collimated uniform light which is perpendicular to the light emitting surface and parallel to the central axis of the lens.

6. A sky light as claimed in any one of claims 1 to 5, characterized in that The light emitting surface is further provided with a plurality of stripe-shaped protrusions, and the protrusions are arranged to extend along the second direction.

7. A sky light as claimed in claim 6, characterized in that A plurality of the stripe-shaped protrusions are uniformly spaced along the first direction.

8. A sky light as claimed in any one of claims 1 to 5, characterized in that The Rayleigh scattering member is in the shape of a plate, the first direction is parallel to the plate surface of the Rayleigh scattering member, and the Rayleigh scattering member is located obliquely below the light source module; and a plurality of the light source modules are uniformly spaced in the first direction.

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