Condenser lens and luminaire

Abstract

The utility model provides a kind of condenser lens and lamp, the outer contour of condenser lens is similar to circular table, lens includes the light exit surface of large diameter end, the light inlet hole and total reflection perimeter that are recessed from the end face of small diameter end to condenser lens, wherein, light inlet hole includes normal incidence surface and side incidence surface, normal incidence surface is opposite to light exit surface, the middle part of normal incidence surface is formed arc convex surface by bulging towards the aperture of light inlet hole, side incidence surface includes first perimeter section and second perimeter section, first perimeter section is located between aperture and second perimeter section, and first perimeter section is equipped with sunning structure;Light exit surface includes a plurality of concentric distribution of tooth ring, the tooth top of tooth ring protrudes away from aperture, the tooth width of multiple tooth rings gradually decreases from inner ring to outer ring, the tooth inclination angle of multiple tooth rings gradually increases from inner ring to outer ring, the tooth height of tooth ring gradually decreases from the direction of optical axis of condenser lens to outer circumference;Lamp is equipped with the condenser lens, and the condensing lens can reduce volume and has good condensing effect.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, specifically to a focusing lens and a lighting fixture equipped with the focusing lens. Background Technology

[0002] Existing total internal reflection lenses have drawbacks such as large structural size and mediocre light focusing effect when achieving small-angle collimation of light, making them difficult to adapt to small lighting devices with high size constraints, such as flashlights, thus limiting their application expansion in small and compact lighting scenarios. Utility Model Content

[0003] The primary objective of this invention is to provide a light-concentrating lens that can reduce size while maintaining good light-concentrating effect.

[0004] The second objective of this invention is to provide a lamp equipped with the aforementioned focusing lens.

[0005] To achieve the first objective of this utility model, a condensing lens is provided. The outer contour of the condensing lens is shaped like a frustum. The lens includes an emitting surface at the large diameter end, an entrance aperture recessed into the condensing lens from the small diameter end, and a total internal reflection circumferential surface. The entrance aperture includes a front entrance surface and a side entrance surface. The front entrance surface is opposite to the emitting surface. The middle part of the front entrance surface is raised towards the opening of the entrance aperture to form an arc-shaped convex surface. The side entrance surface includes a first circumferential section and a second circumferential section. The first circumferential section is located between the opening and the second circumferential section and has a textured structure. The emitting surface includes multiple toothed rings distributed in concentric circles. The tooth tips of the toothed rings protrude away from the opening. The tooth width of the multiple toothed rings gradually decreases from the inner circle to the outer circle, the tooth inclination angle of the multiple toothed rings gradually increases from the inner circle to the outer circle, and the tooth height of the toothed rings gradually decreases from the optical axis of the condensing lens in the direction of the outer circumference.

[0006] As can be seen above, when the light emitted from the light-emitting module enters the light-inlet aperture, the light projected onto the front light-inlet surface is directly refracted onto the light-emitting surface, while the light projected onto the side light-inlet surface is first refracted onto the total internal reflection surface, and then refracted onto the light-emitting surface through the total internal reflection surface. Through the structural design of the light-emitting surface and the light-inlet aperture, the incident light is precisely controlled, so that the incident light is focused into collimated light, achieving the effect of collimated light at a small angle. At the same time, the size and weight of the condenser lens can be reduced, making the condenser lens suitable for small lighting devices with high volume constraints, such as flashlights.

[0007] A further approach is to decrease the tooth width of multiple toothed rings from the inner ring to the outer ring by a decreasing ratio of [percentage missing]. , The increasing ratio of the tooth inclination angle of multiple toothed rings from the inner ring to the outer ring is: , .

[0008] As can be seen from the above, since the incident light surface plays a preliminary focusing role, by designing the tooth width and angle of each tooth ring, the light-emitting surface can first perform secondary focusing treatment on the light refracted by the incident light surface and the total internal reflection circumferential surface, so that the emitted light rays form collimated and focused light, thereby ensuring the light control effect and achieving the effect of collimated light rays at a small angle.

[0009] A further proposed solution is to set the maximum range of the tooth inclination angle of the toothed ring to be... Where n is the refractive index of the condenser lens material. , It is half the beam angle of the light source.

[0010] As can be seen from the above, by designing the maximum tilt angle of the toothed ring, the optical efficiency of the condenser lens can be guaranteed, the light projected onto the toothed ring can be prevented from being totally reflected back into the condenser lens, the light control accuracy of the condenser lens can be guaranteed, and the collimation and focusing effect of the condenser lens can be guaranteed.

[0011] A further proposed solution is that the optical axis and the center of the aperture form a first intersection point, the front light-incident surface and the side light-incident surface have a second intersection point, a line is connected between the first intersection point and the second intersection point, and the line and the optical axis form a light source beam angle, which is between 10° and 45°.

[0012] As can be seen from the above, by designing the beam angle of the light source, the light entering the normal incident surface and the total reflection peripheral surface is ensured, thereby ensuring the overall light control effect and light emission effect of the condenser lens.

[0013] A further alternative is to make the condenser lens from polycarbonate, polymethyl methacrylate, silicone, or glass.

[0014] As can be seen from the above, the condenser lens made of the above materials has excellent light transmittance, ensuring the lighting effect.

[0015] A further option is to have a tooth width between 0.5 mm and 3 mm.

[0016] As can be seen from the above, by designing the tooth width, it is possible to ensure that the light-emitting surface has a sufficient number of tooth rings to refract the light from the incident light surface and the total internal reflection circumferential surface, thereby ensuring the collimation and focusing effect of the light refracted by the light-emitting surface. In addition, the tooth tilt angle design of the tooth rings helps to reduce the size and weight of the focusing lens while satisfying the focusing effect.

[0017] A further proposed solution is to make the height of the first circumferential section along the axial direction of the light entrance aperture 0.2 to 1 times the maximum depth of the light entrance aperture.

[0018] As can be seen from the above, the range of the textured structure of the first ring segment can be flexibly adjusted according to the characteristics of the LED package to adapt to the light emission angle and light intensity distribution of different LED light sources, so that the focusing lens can be used in different application scenarios and ensure the light control accuracy and light control effect.

[0019] A further proposed approach is to use a Bezier surface, a circular arc surface, or a freeform surface for the front light-incident surface, and a straight line for the generatrix of the side light-incident surface.

[0020] As can be seen from the above, by designing the light-incident surface and the side light-incident surface, the refraction effect of the light-incident aperture on the incident light can be ensured, so as to cooperate with the total internal reflection circumferential surface to refract all the incident light onto the light-out surface as required.

[0021] A further proposed solution is to make the second perimeter section smooth.

[0022] As can be seen from the above, this design allows non-yellow light wavelengths and / or light with a low proportion of yellow light from the LED light source entering the second peripheral section to enter the total internal reflection peripheral surface with less interface loss, thereby ensuring the light efficiency of the focusing lens.

[0023] To achieve the second objective of this utility model, this utility model provides a lamp, including a light-emitting module, which further includes the aforementioned focusing lens, wherein the light-emitting end of the light-emitting module is arranged facing the light-inlet hole and located at the opening of the hole.

[0024] As can be seen from the above, by setting the above-mentioned focusing lens, the lamp can achieve the collimation and emission effect of light at a small angle, and it also helps to make the lamp miniaturized. Attached Figure Description

[0025] Figure 1 This is a structural diagram of an embodiment of the condensing lens of this utility model.

[0026] Figure 2 This is a schematic diagram of an embodiment of the focusing lens of this utility model.

[0027] Figure 3 This is a first partial cross-sectional view of an embodiment of the condenser lens of this utility model.

[0028] Figure 4 This is a second partial cross-sectional view of an embodiment of the condenser lens of this utility model.

[0029] Figure 5 This is a schematic diagram of light refraction in an embodiment of the focusing lens of this utility model.

[0030] Figure 6 This is a structural diagram of an embodiment of the lamp of this utility model.

[0031] Figure 7 This is a schematic diagram of light emission from an embodiment of the lamp of this utility model.

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0033] Condensing Lens Example Reference Figure 1 and Figure 2 The outer contour of the condenser lens 101 is roughly frustum-shaped. The condenser lens 101 includes a light-emitting surface 1, an entrance aperture 2, and a total internal reflection surface 3. The light-emitting surface 1 is located at the large-diameter end face of the frustum-shaped condenser lens 101 (i.e., the lower base of the frustum-shaped condenser lens 101). The entrance aperture 2 is recessed into the condenser lens 101 along its height direction from the small-diameter end face (i.e., the upper base of the frustum-shaped condenser lens 101). The total internal reflection surface 3 is the side surface of the frustum-shaped condenser lens 101.

[0034] The light-emitting surface 1 includes multiple toothed rings 11, each with a different diameter, and the multiple toothed rings 11 are arranged concentrically. The tips of the teeth of each toothed ring 11 protrude away from the opening of the light-entry aperture 2, that is, the tips of the teeth of each toothed ring 11 protrude away from the end face of the smaller diameter end of the frustum-shaped condenser lens 101. The center of each toothed ring 11 is preferably located on the optical axis L1 of the condenser lens 101, and the multiple toothed rings 11 together form a Fresnel sawtooth structure, with the optical axis L1 being substantially parallel to the height direction of the condenser lens 101.

[0035] Combination Figure 3 The tooth height of the tooth ring 11 (referring to the tooth height of a single tooth ring 11) gradually decreases from the optical axis L1 to the outer periphery. That is, in the radial direction of the tooth ring 11, the tooth height of the tooth ring 11 near the optical axis L1 is greater than the tooth height of the tooth ring 11 away from the optical axis L1, so as to bring the light closer to the optical axis L1 of the condenser lens 101 and make the outgoing light collimated and focused.

[0036] Furthermore, the tooth width of the plurality of toothed rings 11 gradually decreases from the inner ring to the outer ring. Specifically, the decreasing ratio of the tooth width of the plurality of toothed rings 11 from the inner ring to the outer ring is as follows: , For example, suppose the tooth widths of the toothed rings 11 from the innermost to the outermost ring are d1, d2, d3, ..., d4 respectively. n-1 d n Therefore, the tooth width of the second ring tooth 11 (counting outwards from the optical axis L1 of the condenser lens 101) The tooth width of the third ring tooth 11 ..., the tooth width of the outermost toothed ring 11 .

[0037] Combination Figure 4The tooth inclination angle of the multiple toothed rings 11 gradually increases from the inner ring to the outer ring. Specifically, the increasing ratio of the tooth inclination angle of the multiple toothed rings 11 from the inner ring to the outer ring is as follows: , For example, suppose the tooth inclination angles of the tooth rings 11 from the innermost to the outermost rings are respectively... 1. 2. 3, ... n-1 , n Therefore, the tooth tilt angle of the second ring tooth 11 (counting the outermost circumference from the optical axis L1 of the condenser lens 101) The tooth inclination angle of the third ring tooth 11 ..., the tooth inclination angle of the outermost toothed ring 11 .

[0038] The maximum range of the tooth inclination angle of the tooth ring 11 is as follows: , where n is the refractive index of the condenser lens material 101. , The angle θ is half of the light source beam angle. By designing the maximum value of the tooth tilt angle of the toothed ring 11, the optical efficiency of the condenser lens 101 can be guaranteed, preventing the light projected onto the toothed ring 11 from being totally reflected back into the condenser lens 101, ensuring the light control accuracy of the condenser lens 101, and ensuring the collimation and focusing effect of the condenser lens 101. This is because when the tooth tilt angle of the toothed ring 11 exceeds the aforementioned design value, the optical efficiency of the condenser lens 101 will be very low. At this time, most of the light will be totally reflected back into the condenser lens 101 by the toothed ring 11, making it impossible for the condenser lens 101 to achieve collimation and focusing of the light. In addition, by introducing m to control the maximum value of the tooth tilt angle of the toothed ring 11, the maximum value of the tooth tilt angle of the toothed ring 11 can be adjusted according to the LED package type, so that the condenser lens 101 always maintains excellent optical efficiency.

[0039] The condenser lens 101 is preferably made of polycarbonate, polymethyl methacrylate, silicone or glass, so that the condenser lens 101 has excellent light transmittance and ensures the lighting effect.

[0040] Furthermore, the tooth width of the toothed ring 11 is between 0.5 mm and 3 mm. This tooth width design ensures that the light-emitting surface 1 has a sufficient number of toothed rings 11 to refract light rays from the incident light surface 21 and the total internal reflection peripheral surface 3, thereby guaranteeing the collimation and focusing effect of the light rays refracted by the light-emitting surface 1. In addition, the tooth tilt angle design of the toothed ring 11 helps to reduce the size and weight of the condenser lens 101 while satisfying the focusing effect. This design also ensures a moderate number of toothed rings 11, avoiding excessive complexity in the structure of the condenser lens 101 while meeting optical processing requirements, and preventing excessive tooth height of the toothed rings 11.

[0041] The light entrance aperture 2 includes a front light entrance surface 21 and a side light entrance surface 22. The front light entrance surface 21 is opposite to the light exit surface 1, and the side light entrance surface 22 is arranged around the front light entrance surface 21 in the circumferential direction. That is, the front light entrance surface 21 is the bottom of the light entrance aperture 2, and the side light entrance surface 22 is the hole wall of the light entrance aperture 2.

[0042] The center of the positive incident light surface 21 bulges towards the opening of the light entrance aperture 2 along the axial direction of the light entrance aperture 2, forming an arc-shaped convex surface, thereby enabling the positive incident light surface 21 to achieve a preliminary focusing effect on the incident light. Preferably, the positive incident light surface 21 is a Bezier surface, a circular arc surface, or a freeform surface.

[0043] The side-entry light surface 22 includes a first circumferential section 221 and a second circumferential section 222. The first circumferential section 221 is located between the aperture and the second circumferential section 222, and the first circumferential section 221 has a textured structure. Along the axial direction of the light entrance aperture 2, the height h of the first circumferential section 221 is 0.2 to 1 times the maximum depth H of the light entrance aperture 2, i.e. The maximum depth H of the light entrance aperture 2 is one-third to two-thirds of the height of the condenser lens 101. Due to the characteristics of LED packaging, the yellow spot in the large-angle direction is more severe than the yellow spot in the small-angle direction. Therefore, by setting a textured structure of a certain height (i.e., the first peripheral segment 221), the color of the light from the LED at large angles can be homogenized to adapt to the light emission angle and light intensity distribution of different LED light sources, making the condenser lens 101 suitable for different application scenarios and ensuring light control accuracy and effect. For example, when the yellow light in the large-angle direction of the LED is relatively weak, the height h of the first peripheral segment 221 can be designed to be shorter, that is, the value of height h is smaller; when the yellow light in the large-angle direction of the LED is relatively strong, the height h of the first peripheral segment 221 can be designed to be higher, that is, the value of height h is larger. It can be seen that the setting range of the textured structure of the first peripheral segment 221 can be flexibly adjusted according to the characteristics of the LED packaging.

[0044] In this design, the generatrix l of the side-incident light surface 22 is a straight line. The design of the light-incident surface and the side-incident light surface 22 ensures the refraction effect of the light-incident aperture 2 on the incident light, thus cooperating with the total internal reflection peripheral surface 3 to refract all the incident light onto the light-exiting surface 1 as required. Furthermore, the second peripheral surface section 222 is preferably a smooth surface. Light from the LED light source in the second peripheral surface section 222, in the non-yellow light band and / or with a low proportion of yellow light, enters the total internal reflection peripheral surface 3 with less interface loss, thereby ensuring the light efficiency of the condenser lens 101.

[0045] Since the light intensity distribution of an LED approximates a Lambertian distribution, with the strongest light intensity at its center and a weaker light intensity as the emission angle increases, the focusing lens 101 achieves focusing by designing the light-incident surface 21 of the light-incident aperture 2 as described above. This allows the lens to initially focus the light projected onto the light-incident surface 21. Correspondingly, the tooth inclination angle of the toothed ring 11 in the central part of the light-emitting surface 1 (i.e., near the optical axis L1) is designed to be relatively small, enabling collimation and focusing of the light refracted onto this part of the toothed ring 11. Furthermore, the toothed ring 11 can be made relatively wide. Figure 5 As shown, the total internal reflection peripheral surface 3 is used to refract the light refracted by the side-incident light surface 22 onto the light-emitting surface 1. Since the total internal reflection peripheral surface 3 has strong light control capability and the light energy reflected by the upper part of the total internal reflection peripheral surface 3 is relatively high, the tooth tilt angle of the tooth ring 11 of the condenser lens 101 closer to the outer periphery is designed to be larger, which can ensure that this part of the light is collimated and focused. In order to make the light uniform and avoid the tooth protrusion of the tooth ring 11 too large, the tooth width of the tooth ring 11 closer to the outer periphery is designed to be smaller than the tooth width of the tooth ring 11 closer to the center. Thus, based on the light intensity distribution, the tooth width of the multiple tooth rings 11 gradually decreases from the inner circle to the outer circle.

[0046] Furthermore, the optical axis L1 intersects the center of the aperture at a first intersection point O1, and the front light-incident surface 21 and the side light-incident surface 22 intersect at a second intersection point O2. A line L2 connects the first intersection point O1 and the second intersection point O2, and this line L2 intersects the optical axis L1 to form a light source beam angle θ, which is between 10° and 45° (i.e., ...). ） By designing the light source beam angle θ, the light entering the incident surface 21 and the total reflection peripheral surface 3 is ensured, thereby ensuring the overall light control effect and light emission effect of the condenser lens 101; Because when the light source beam angle θ is less than 10°, too little light is received by the incident light surface 21, affecting the control of this part of the light. Similarly, when the light source beam angle θ is greater than 45°, too little light is received by the total reflection peripheral surface 3. Since the total reflection peripheral surface 3 has a strong light control capability, too little light entering the total reflection peripheral surface 3 will have a negative effect on the overall effect of the condenser lens 101.

[0047] In summary, the design of the condenser lens 101 ensures that when the light emitted from the light-emitting module enters the light entrance aperture 2, the light projected onto the front light entrance surface 21 is directly refracted by the front light entrance surface 21 onto the light exit surface 1 for initial focusing. The light projected onto the side light entrance surface 22 is first refracted onto the total internal reflection peripheral surface 3, and then refracted onto the light exit surface 1 via the total internal reflection peripheral surface 3, allowing the light exit surface 1 to perform secondary focusing on the emitted light. With the cooperation of the light exit surface 1 and the light entrance aperture 2, precise light control of the incident light is achieved, enabling the incident light to be focused into collimated light, achieving the effect of collimated light at a small angle. At the same time, the size and weight of the condenser lens 101 can be reduced, making the condenser lens 101 suitable for small lighting devices with high volume constraints, such as flashlights.

[0048] Lighting Fixture Examples Reference Figure 6 and Figure 7 The lamp 100 includes a focusing lens 101, a lamp body 102, and a light-emitting module 103. This embodiment uses a flashlight as an example for illustration. It can be understood that the lamp 100 can also be other types of lamps, including but not limited to downlights, spotlights, and track lights.

[0049] The condenser lens 101 is the same as the condenser lens 101 described in the above embodiment. Both the condenser lens 101 and the light-emitting module 103 are installed inside the lamp body 102. The light-emitting end of the light-emitting module 103 is positioned facing the light entrance hole 2 of the condenser lens 101, and the light-emitting end of the light-emitting module 103 is located at the opening of the light entrance hole 2. Under the action of the condenser lens 101, the light emitted by the light-emitting module 103 can be collimated and focused by the condenser lens 101, achieving a small-angle collimation effect.

[0050] As can be seen, by setting a focusing lens 101, the lamp 100 can achieve the collimated emission effect of light at a small angle, which also helps to reduce the size of the design.

[0051] Finally, it should be emphasized that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A condensing lens, wherein the outer contour of the condensing lens is shaped like a frustum, the lens comprising a light-emitting surface located at the large-diameter end, a light-entry aperture recessed into the condensing lens from the end face of the small-diameter end, and a total internal reflection circumferential surface, characterized in that: The light inlet aperture includes a front light inlet surface and a side light inlet surface. The front light inlet surface is opposite to the light outlet surface. The middle part of the front light inlet surface is raised towards the opening of the light inlet aperture to form an arc-shaped convex surface. The side light inlet surface includes a first circumferential section and a second circumferential section. The first circumferential section is located between the opening and the second circumferential section. The first circumferential section is provided with a textured structure. The light-emitting surface includes multiple toothed rings arranged in concentric circles. The tooth tips of the toothed rings protrude away from the aperture. The tooth width of the multiple toothed rings gradually decreases from the inner circle to the outer circle. The tooth inclination angle of the multiple toothed rings gradually increases from the inner circle to the outer circle. The tooth height of the toothed rings gradually decreases from the optical axis of the condensing lens in the direction of the outer periphery.

2. The condenser lens according to claim 1, characterized in that: The decreasing ratio of the tooth width of the plurality of toothed rings from the inner ring to the outer ring is as follows: , ; The tooth inclination angle of the plurality of toothed rings gradually increases from the inner ring to the outer ring in an increasing ratio of . , .

3. The condensing lens according to claim 2, characterized in that: The maximum range of the tooth inclination angle of the toothed ring is: n is the refractive index of the condenser lens material. , It is half the beam angle of the light source.

4. The condenser lens according to claim 3, characterized in that: The optical axis and the center of the aperture form a first intersection point, the front light-incident surface and the side light-incident surface have a second intersection point, a line is connected between the first intersection point and the second intersection point, and the light beam angle between the connecting line and the optical axis is formed between 10° and 45°.

5. The condensing lens according to claim 3, characterized in that: The condenser lens is made of polycarbonate, polymethyl methacrylate, silicone or glass.

6. The condensing lens according to any one of claims 1 to 5, characterized in that: The tooth width is between 0.5 mm and 3 mm.

7. The condenser lens according to claim 6, characterized in that: Along the axial direction of the light entrance aperture, the height of the first circumferential section is 0.2 to 1 times the maximum depth of the light entrance aperture.

8. The condenser lens according to claim 7, characterized in that: The incident light surface is a Bézier surface, a circular arc surface, or a freeform surface; The generatrix of the side-incident light surface is a straight line.

9. The condenser lens according to claim 8, characterized in that: The second peripheral section is smooth.

10. A lighting fixture, including a light-emitting module, characterized in that, It also includes a focusing lens as described in any one of claims 1 to 9, wherein the light-emitting end of the light-emitting module is disposed facing the light-inlet hole and located at the opening of the hole.

Images