Lens and lamp
By designing a frustum-shaped lens and utilizing a gradient toothed ring structure and a Bezier surface, the problem of mismatched light intensity distribution in existing lenses within luminaires was solved, achieving uniform lighting and ambient decorative effects around the luminaire.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-03-17
AI Technical Summary
Existing total internal reflection lenses do not match the light intensity distribution characteristics of specific ambient lighting scenarios such as gift box ambient lighting, making it difficult to effectively illuminate the area around the lamp and/or the surface patterns around the lamp.
Design a lens with an outer contour shaped like a frustum. The light inlet includes a front light inlet surface and a side light inlet surface. The light outlet surface has a gradually changing toothed ring structure. Axisymmetric polarization of light is achieved by controlling the tooth width and tooth tilt angle. Combined with a Bezier surface design, the light utilization rate is improved.
It achieves uniform lighting around the lamps, enhances the decorative effect of ambient lighting, and improves light utilization efficiency.
Smart Images
Figure CN121676903A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of lighting technology, and more specifically to a transparent lighting fixture with the lens. Background Technology
[0002] The maximum light intensity of existing total internal reflection lenses is in the direction of the collimated optical axis, making them difficult to adapt to specific ambient lighting scenarios such as gift box ambient lighting. The requirement for this type of ambient lighting is to illuminate the area around the lamp and / or the surface pattern around the lamp, while the requirements for the illumination range and intensity in the axial direction of the lamp are relatively low. The light intensity distribution characteristics of existing lenses do not match the requirements of this type of scenario. Summary of the Invention
[0003] To address the aforementioned problems, the main objective of this invention is to provide a lens that can illuminate the area surrounding a lamp and / or the pattern around the lamp.
[0004] Another object of the present invention is to provide a lamp with the above-described lens.
[0005] To achieve the first objective of this invention, the present invention provides a lens with an outer contour shaped like a frustum. The lens includes a light-emitting surface located at the large-diameter end, a light-entry aperture recessed into the lens from the end face of the small-diameter end, and a total internal reflection circumferential surface. The light-entry aperture includes a front light-entry surface and a side light-entry surface. The front light-entry surface is opposite to the light-emitting surface. The front light-entry surface includes a plurality of first toothed rings arranged concentrically. The tooth tips of the first toothed rings extend toward the light-emitting surface. The first tooth width of the plurality of first toothed rings gradually increases from the inner circle to the outer circle. The side light-entry surface is a curved surface. The curvature of the curved surface near the front light-entry surface is less than the curvature of the curved surface near the end face. The light-emitting surface includes a plurality of second toothed rings arranged concentrically. The tooth tips of the second toothed rings extend away from the end face. The second tooth width of the plurality of second toothed rings gradually increases from the inner circle to the outer circle. The tooth inclination angle of the plurality of second toothed rings gradually increases from the inner circle to the outer circle.
[0006] As can be seen from the above, by designing the light-emitting surface and light-entry aperture of the lens, when light is emitted through the lens, under the axially symmetrical polarization of the lens, the main light intensity direction is around the luminaire with this lens (the luminaire body is made of light-transmitting material), thereby illuminating the decorative panels around the luminaire body, and also illuminating the luminaire itself, thus playing a decorative lighting role and enhancing the ambient lighting effect around the luminaire.
[0007] A further approach is to have the first tooth width of multiple first tooth rings gradually increase from the inner ring to the outer ring in an increasing ratio of [missing information]. , .
[0008] As can be seen from the above, since the light distribution curve of the LED light source is approximately Lambertian, the light intensity decreases from the central optical axis to a larger angle. Therefore, by increasing the tooth width of the first tooth width on the incident light surface from the middle to the outside, the light-gathering efficiency can be improved and the light can be effectively controlled with as few Fresnel turns as possible.
[0009] A further proposed solution is that the second tooth width of multiple second tooth rings gradually increases from the inner ring to the outer ring at a progressively larger ratio. , The increasing ratio of the tooth inclination angle of multiple second toothed rings from the inner ring to the outer ring is: , .
[0010] As can be seen from the above, based on the lens's requirement for controlling the light trend, the second tooth width and tooth tilt angle of the second toothed ring on the light-emitting surface increase progressively. This is because the light control capability of the lens's total internal reflection peripheral surface is higher than that of the lens's central incident light surface. Furthermore, the upper part of the total internal reflection peripheral surface corresponds to the second toothed ring near the outer ring of the light-emitting surface, and the light energy reflected from the upper part of the total internal reflection peripheral surface is relatively high. Therefore, in order to achieve a larger angle of polarization for this part of the light, the second width and tooth tilt angle of the outer second toothed ring are made larger (the larger the tooth tilt angle, the larger the polarization refraction angle), which can improve the overall polarization angle of the lens. In addition, the smaller tooth tilt angle of the second toothed ring in the middle part of the light-emitting surface can make the overall light spot of the lens uniform and avoid obvious dark areas in the center of the light spot. The larger the tooth tilt angle of the second toothed ring further out, the higher the light energy reflected from the upper part of the aforementioned total internal reflection peripheral surface, ensuring better achievement of the polarization target.
[0011] A further proposed solution is to have the maximum range of the tooth inclination angle of the second toothed ring be [missing value]. , where n is the refractive index of the lens material.
[0012] As can be seen from the above, by designing the maximum angle of the second tooth ring, the light is prevented from being totally reflected back into the lens, thus preventing the lens from failing to refract the light to the periphery of the light-emitting surface.
[0013] A further proposed solution is that the optical axis of the lens intersects with the center of the entrance aperture, and there is a line connecting the intersection point to the tip of the first toothed ring on the outermost ring. The angle between the line and the optical axis is between 5° and 30°.
[0014] As can be seen above, light rays within the angle range between the connecting line and the optical axis are refracted from the direct light-incident surface, while light rays larger than this angle range are refracted from the side light-incident surface and undergo total internal reflection at the lens's total internal reflection periphery, ultimately causing all light rays to be refracted out from the lens's exit surface. Therefore, by setting the range of the angle, the refraction effect of the incident light rays at the entrance aperture can be ensured, and the overall light spot after emission can be made uniform, preventing the occurrence of local dark areas.
[0015] A further proposed solution is to use a Bezier surface for the side-incident light surface.
[0016] As can be seen from the above, using a Bezier surface instead of a traditional flat surface can reduce Fresnel reflections on the lens surface, allowing more light to enter the lens and thus improving the lens's optical efficiency.
[0017] A further proposed design is that the width of the first tooth is between 0.5 mm and 2.5 mm, and the width of the second tooth is between 0.5 mm and 3 mm; the tooth height of the first tooth ring gradually increases from the optical axis of the lens in the direction of the outer periphery, and the tooth height of the second tooth ring gradually increases from the optical axis in the direction of the outer periphery.
[0018] As can be seen from the above, based on a lens of conventional size, the design of the first tooth width allows the incident light surface to have a sufficient number of first tooth rings to refract light, thereby allowing the light to be better refracted onto the second tooth ring; the design of the second tooth width allows the exiting light surface to have a sufficient number of second tooth rings to refract light from the incident light surface and the total internal reflection peripheral surface, thereby making the principal intensity direction of the light refracted through the exiting light surface the periphery of the lens's exiting light surface.
[0019] A further proposed solution is that multiple first toothed rings together form a first Fresnel serration structure; and multiple second toothed rings together form a second Fresnel serration structure.
[0020] As can be seen from the above, this design gives the lens a gradient double Fresnel sawtooth structure, achieving axially symmetric polarization of the light emitted from the lens. This allows luminaires equipped with this lens to be used for ambient lighting or other similar lighting applications, achieving both ambient lighting effects and area lighting effects around the luminaire. In addition, the gradient double Fresnel sawtooth structure also helps to reduce the size and weight of the lens.
[0021] A further alternative is to make the lens from polycarbonate, polymethyl methacrylate, silicone, or glass.
[0022] As can be seen from the above, lenses made of the aforementioned materials have excellent light transmittance, ensuring lighting effects.
[0023] To achieve the second objective of this invention, this invention provides a lamp, including a light-transmitting lamp body and a light source module, wherein the light source module is installed in the light-transmitting lamp body, and the lamp also includes the aforementioned lens, with the light-emitting end of the light source module located at the light entrance hole of the lens.
[0024] As can be seen from the above, by configuring the above-mentioned lens, the luminaire can be used for ambient lighting or other similar lighting applications to achieve ambient lighting effects and zonal lighting effects on the area around the luminaire. Attached Figure Description
[0025] Figure 1 This is a structural diagram of the lens embodiment of the present invention from a first perspective.
[0026] Figure 2 This is a structural diagram of the lens embodiment of the present invention from a second perspective.
[0027] Figure 3 This is a cross-sectional view of an embodiment of the lens of the present invention.
[0028] Figure 4 This is a first partial cross-sectional view of an embodiment of the lens of the present invention.
[0029] Figure 5 This is a second partial cross-sectional view of an embodiment of the lens of the present invention.
[0030] Figure 6 This is a schematic diagram of light refraction in an embodiment of the lens of the present invention.
[0031] Figure 7 This is a third partial cross-sectional view of an embodiment of the lens of the present invention.
[0032] Figure 8 This is a schematic diagram of the illumination of an embodiment of the lamp of the present invention.
[0033] Figure 9 This is a diagram illustrating the lighting effect of an embodiment of the lamp of the present invention.
[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation
[0035] Lens Examples Reference Figure 1 and Figure 2 The outer contour of lens 100 is roughly frustum-shaped. Lens 100 includes a light-emitting surface 1, a total internal reflection surface 2, and an entrance aperture 3. The light-emitting surface 1 is located at the end face of the large-diameter end of the frustum-shaped lens 100 (i.e., the lower base of the frustum-shaped lens 100). The total internal reflection surface 2 is the side surface of the frustum-shaped lens 100. The entrance aperture 3 is recessed into the lens 100 from the small-diameter end face of the frustum-shaped lens 100 (i.e., the upper base of the frustum-shaped lens 100) along the height direction of the lens 100. Figure 3 The light inlet 3 includes a front light inlet surface 31 and a side light inlet surface 32. The front light inlet surface 31 is opposite to the light outlet surface 1, and the side light inlet surface 32 is arranged around the front light inlet surface 31. That is, the front light inlet surface 31 is the bottom of the light inlet 3, and the side light inlet surface 32 is the hole wall of the light inlet 3.
[0036] The light-emitting surface 1 includes a plurality of second toothed rings 11, which have different diameters and are arranged in concentric circles. The tips of the teeth of the second toothed rings 11 extend away from the small-diameter end face of the lens 100. The center of the second toothed rings 11 is preferably located on the optical axis L of the lens 100, and the plurality of second toothed rings 11 together form a second Fresnel sawtooth structure.
[0037] Combination Figure 4 The tooth height of the second toothed ring 11 (referring to the tooth height of a single second toothed ring 11) gradually increases from the optical axis L towards the outer periphery (i.e., in the radial direction of the second toothed ring 11, the tooth height of the second toothed ring 11 near the optical axis L is smaller than the tooth height away from the optical axis), so as to refract light to the periphery of the light-emitting side of the lens 100; and the second tooth width of the multiple second toothed rings 11 gradually increases from the inner circle to the outer circle. Specifically, the increasing ratio of the multiple second tooth widths from the inner circle to the outer circle is... , For example, suppose the second tooth widths of the second tooth ring 11 from the innermost to the outermost ring are D1, D2, D3, ..., D... n-1 D n Therefore, the second tooth width of the second ring 11 (counting outwards from the optical axis L of lens 100) is... The second tooth width of the second tooth ring 11 on the third ring ..., the second tooth width of the outermost second tooth ring 11 .
[0038] In addition, combined Figure 5 The tooth inclination angles of the multiple second toothed rings 11 gradually increase from the inner ring to the outer ring. Specifically, the increasing ratio of the tooth inclination angles of the multiple second toothed rings 11 from the inner ring to the outer ring is as follows: , For example, suppose the tooth inclination angles of the second toothed ring 11 from the innermost to the outermost ring are respectively 1. 2. 3, ... n-1 , n Then, the tooth tilt angle of the second ring 11 (counting outwards from the optical axis L of lens 100) is... The tooth inclination angle of the second tooth ring 11 in the third ring ..., the tooth inclination angle of the outermost second toothed ring 11 .
[0039] Based on the light control requirements of lens 100, the second tooth width and tooth tilt angle of the multiple second toothed rings 11 on the light-emitting surface 1 increase from the inner ring to the outer ring. This is because the light control capability of the total internal reflection peripheral surface 2 of lens 100 is higher than that of the central incident light surface 31 of lens 100, and the upper end of the total internal reflection peripheral surface 2 is closer to the outer ring of the second toothed ring 11 on the light-emitting surface 1. Figure 6 It can be seen that the light energy reflected from the upper part of the total internal reflection peripheral surface 2 is relatively high. Therefore, in order to achieve a larger angle of polarization of this part of the light and improve the overall polarization angle of the lens 100, the second tooth width and tooth tilt angle of the second tooth ring 11 located on the outer ring are designed to be larger than those of the second tooth ring 11 located on the inner ring (the larger the tilt angle, the larger the polarization refraction angle). In addition, making the tilt angle of the second tooth ring 11 near the optical axis L of the lens 100 smaller can also make the overall light spot of the lens 100 uniform, thereby avoiding obvious dark areas in the center of the light spot. The tooth tilt angle of the second tooth ring 11 on the outer ring is larger because the light intensity of the second tooth ring 11 on the outer ring of the light-emitting surface 1 of the lens 100 corresponding to the total internal reflection peripheral surface 2 of the lens 100 is stronger, thus better achieving the polarization target.
[0040] Furthermore, the maximum range of the tooth inclination angle of the second toothed ring 11 is... Where n is the refractive index of the lens 100 material. When the maximum value of the tooth tilt angle of the second toothed ring 11 exceeds... In such cases, the optical efficiency of lens 100 will be very low, resulting in most of the light being totally reflected back into lens 100, preventing lens 100 from refracting the light to the periphery of the light-emitting surface 1. Lens 100 is preferably made of polycarbonate, polymethyl methacrylate, silicone, or glass, so that lens 100 has excellent light transmittance and ensures illumination effect.
[0041] The light-incident surface 31 includes multiple first toothed rings 311, each with a different diameter, and the multiple first toothed rings 311 are concentrically distributed. The tips of the teeth of the first toothed rings 311 extend towards the light-emitting surface 1; the centers of the first toothed rings 311 are preferably located on the optical axis L of the lens 100, and the multiple first toothed rings 311 together form a first Fresnel sawtooth structure. Through the distribution design of the multiple first toothed rings 311 and multiple second toothed rings 11, the lens 100 has a gradient double Fresnel sawtooth structure, achieving axially symmetric polarization of the light emitted from the lens 100. This allows luminaires equipped with this lens 100 to be used for ambient lighting or other similar applications, achieving both ambient lighting effects and area lighting effects around the luminaire. Furthermore, the gradient double Fresnel sawtooth structure helps reduce the size and weight of the lens 100.
[0042] Combination Figure 7The first tooth width of the multiple first tooth rings 311 gradually increases from the inner ring to the outer ring; specifically, the increasing ratio of the multiple first tooth widths from the inner ring to the outer ring is as follows: , For example, suppose the first tooth widths of the first tooth ring 311 from the innermost to the outermost ring are d1, d2, ..., d... n-1 d n Therefore, the width of the first tooth of the first tooth ring 311 of the second ring (counting outwards from the optical axis L of lens 100) The first tooth width of the first tooth of the third ring 311 ...the first tooth width of the outermost ring 311 Since the light distribution curve of the LED light source is approximately Lambertian, the light intensity decreases from the optical axis L to a larger angle. Therefore, by increasing the tooth width of the first tooth width of the incident light surface 31 from the middle to the outside, the light-gathering efficiency can be improved and the light can be effectively controlled with as few Fresnel turns as possible.
[0043] Furthermore, the first tooth width is between 0.5 mm and 2.5 mm. This design is based on a conventionally sized lens 100. By designing the first tooth width, the incident light surface 31 can have a sufficient number of first toothed rings 311 to refract light, thereby allowing light to be better refracted onto the first toothed rings 311, and ensuring that the number of first toothed rings 311 is moderate and that the tooth height of the first toothed rings 311 is not too high. The second tooth width is between 0.5 mm and 3 mm. Similarly, based on a conventionally sized lens 100, by designing the second tooth width, the emitting light surface 1 can have a sufficient number of second toothed rings 11 to refract light from the incident light surface 31 and the total internal reflection peripheral surface 2, thereby ensuring that the principal intensity direction of the light refracted through the emitting light surface 1 is around the circumference of the emitting light surface 1 of the lens 100, and ensuring that the number of second toothed rings 11 is moderate, preventing the structure of the lens 100 from becoming overly complex, and avoiding that the tooth height of the second toothed rings 11 is not too high. It should be noted that when the lens 100 is applied to a large lighting fixture, the lens 100 can be enlarged proportionally. At this time, the width of the first tooth and the width of the second tooth are also larger than the above range values due to the proportional enlargement. Of course, when the lens 100 is applied to a large lighting fixture and the lens 100 is not enlarged proportionally, the number of turns of the first tooth ring 311 and the second tooth ring 11 can be increased, and the tooth width of the first tooth ring 311 and the second tooth ring 11, as well as the tooth tilt angle of the second tooth ring 11, can also be appropriately increased.
[0044] In this design, the optical axis L of the lens 100 intersects with the center of the entrance aperture 3 at point o. A line l connects point o to the tooth tip of the outermost first toothed ring 311. The angle θ between the line l and the optical axis L is preferably between 5° and 30°. Light rays within the angle θ range between the line l and the optical axis L are refracted from the front entrance surface 31, while light rays larger than this angle range are refracted from the side entrance surface 32 and undergo total internal reflection at the total internal reflection circumferential surface 2 of the lens 100. Ultimately, all light rays are refracted out from the exit surface 1 of the lens 100. Therefore, by setting the range of the angle θ, the refraction effect of the entrance aperture 3 on the incident light can be ensured, and the overall light spot after emission is uniform, preventing local dark areas.
[0045] In addition, the tooth height of the first tooth ring 311 (referring to the tooth height of a single first tooth ring 311 itself) gradually increases from the optical axis L to the outer periphery. That is, in the radial direction of the first tooth ring 311, the tooth height of the first tooth ring 3111 near the optical axis L is smaller than the tooth height away from the optical axis, so as to refract the light to the four sides of the light-emitting side of the lens 100.
[0046] The side-incident surface 32 is curved, preferably a Bézier surface. Using a Bézier surface instead of a traditional straight surface as the side-incident surface 32 can reduce Fresnel reflections on the surface of the lens 100, allowing more light to enter the interior of the lens 100, thereby improving the optical efficiency of the lens 100. In addition, the curvature of this surface near the front-incident surface 31 is less than the curvature of the end face of the surface near the small diameter end (or at the opening of the light entrance aperture 3).
[0047] In summary, by designing the light-emitting surface 1 and the light-entry aperture 3 of the lens 100, when light is emitted through the lens 100, under the axially symmetrical polarization of the lens 100, the main light intensity direction is around the luminaire equipped with the lens 100 (the luminaire body is made of a light-transmitting material), thereby illuminating the decorative panels around the luminaire body and also illuminating the luminaire itself, thus playing a decorative lighting role and enhancing the ambient lighting effect around the luminaire.
[0048] Lighting Fixture Examples Reference Figure 8 The lamp 4 includes a light-transmitting lamp body 41, a light source module 42, and a lens 100; wherein, the lens 100 is the lens 100 described in the above-mentioned lens embodiment. The light source module 42 and the lens 100 are installed inside the light-transmitting lamp body 41, and the light source module 42 and the lens 100 are preferably located at the top of the light-transmitting lamp body 41. The light-emitting end of the light source module 42 is arranged facing the bottom of the light-transmitting lamp body 41, and the lens 100 is located at the light-emitting end of the light source module 42, and the light-emitting end of the light source module 42 is located at the light entrance hole 3 of the lens 100.
[0049] The light-transmitting lamp body 41 can be made of transparent or semi-transparent materials, allowing light from the light source module 42 to pass through it. The shape of the light-transmitting lamp body 41 can be a cylinder, prism, frustum, or similar shape. In addition, patterns can be set on the light-transmitting lamp body 41.
[0050] Combination Figure 9 When the light emitted by the light source module 42 shines from the top of the light-transmitting lamp body 41 to the bottom of the light-transmitting lamp body 41, due to the axially symmetrical polarization effect of the lens 100, the main light intensity direction is around the lamp 4. While illuminating the decorative panels around the light-transmitting lamp body 41, the area around the lamp 4 is also illuminated, which plays the role of decorative lighting and enhances the ambient lighting effect around the lamp 4.
[0051] In summary, by configuring the lens 100, the lamp 4 can be used for ambient lighting or other similar lighting applications to achieve ambient lighting effects and provide area lighting for the area around the lamp 4.
[0052] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1.A lens, the lens having a shape of a frustum, the lens comprising an out-coupling surface at a large diameter end, an in-coupling aperture recessed into the lens from an end surface at a small diameter end, and a total internal reflection peripheral surface, wherein: the in-coupling aperture comprises a normal in-coupling surface opposite to the out-coupling surface, the normal in-coupling surface comprises a plurality of first tooth rings arranged in concentric circles, the first tooth rings have tooth crests extending towards the out-coupling surface, a first tooth width of the plurality of first tooth rings gradually increases from an innermost circle to an outermost circle, the in-coupling aperture comprises a curved surface, a curvature of the curved surface near the normal in-coupling surface is smaller than a curvature of the curved surface near the end surface; and the out-coupling surface comprises a plurality of second tooth rings arranged in concentric circles, the second tooth rings have tooth crests extending away from the end surface, a second tooth width of the plurality of second tooth rings gradually increases from the innermost circle to the outermost circle, and a tooth inclination angle of the plurality of second tooth rings gradually increases from the innermost circle to the outermost circle. 2.The lens of claim 1, wherein: the normal in-coupling surface comprises a plurality of first tooth rings arranged in concentric circles, the first tooth rings have tooth crests extending towards the out-coupling surface, a first tooth width of the plurality of first tooth rings gradually increases from an innermost circle to an outermost circle, and the in-coupling aperture comprises a curved surface, a curvature of the curved surface near the normal in-coupling surface is smaller than a curvature of the curved surface near the end surface. 3.The lens of claim 2, wherein: the out-coupling surface comprises a plurality of second tooth rings arranged in concentric circles, the second tooth rings have tooth crests extending away from the end surface, a second tooth width of the plurality of second tooth rings gradually increases from the innermost circle to the outermost circle, and a tooth inclination angle of the plurality of second tooth rings gradually increases from the innermost circle to the outermost circle. 4.The lens of claim 3, wherein: the normal in-coupling surface comprises a plurality of first tooth rings arranged in concentric circles, the first tooth rings have tooth crests extending towards the out-coupling surface, a first tooth width of the plurality of first tooth rings gradually increases from an innermost circle to an outermost circle, the in-coupling aperture comprises a curved surface, a curvature of the curved surface near the normal in-coupling surface is smaller than a curvature of the curved surface near the end surface, the out-coupling surface comprises a plurality of second tooth rings arranged in concentric circles, the second tooth rings have tooth crests extending away from the end surface, a second tooth width of the plurality of second tooth rings gradually increases from the innermost circle to the outermost circle, and a tooth inclination angle of the plurality of second tooth rings gradually increases from the innermost circle to the outermost circle. The increasing ratio of the first tooth width of the plurality of first tooth rings gradually increasing from the inner ring to the outer ring is , . 5.The lens of claim 4, wherein: an intersection between an optical axis of the lens and a center of the in-coupling aperture has a line of intersection with a tooth crest of the first tooth ring of the outermost circle, and an angle between the line of intersection and the optical axis is between 5° and 30°. The increasing ratio of the second tooth width of the plurality of second tooth rings gradually increasing from the inner ring to the outer ring is , ; The increasing ratio of the tooth inclination angle of the plurality of second tooth rings gradually increasing from the inner ring to the outer ring is , . 6.The lens of claim 4, wherein: the curved surface is a Bessel surface. The maximum value range of the tooth inclination angle of the second tooth ring is n is the material refractive index of the lens. 7.The lens of any one of claims 1 to 6, wherein: the first tooth width is between 0.5 mm and 2.5 mm, and the second tooth width is between 0.5 mm and 3 mm; a tooth height of the first tooth ring gradually increases from the optical axis of the lens to an outer periphery, and a tooth height of the second tooth ring gradually increases from the optical axis to the outer periphery. 8.The lens of claim 7, wherein: the plurality of first tooth rings collectively form a first Fresnel sawtooth structure, and the plurality of second tooth rings collectively form a second Fresnel sawtooth structure. 9.The lens of claim 8, wherein: the lens is made of polycarbonate, polymethyl methacrylate, silica gel, or glass. 10.A lamp, comprising a light-transmitting lamp body and a light source module, the light source module being installed in the light-transmitting lamp body, wherein: the lamp further comprises the lens of any one of claims 1 to 9, and a light-emitting end of the light source module is disposed at the in-coupling aperture of the lens.