Optical lens and light source module

Abstract

The utility model discloses an optical lens and light source module, this optical lens includes lens main body, the lens main body includes the light entrance portion, the reflection side wall and the light exit portion that connect gradually, is equipped with the light entrance groove on the light entrance portion, the light entrance groove is used for accommodating light source and recessing to light exit portion one side, the groove bottom of light entrance groove is first light entrance face, the groove wall of light entrance groove is second light entrance face, the reflection side wall has the reflection face, and the light exit portion has the light exit face, wherein, the light that enters the lens main body inside by first light entrance face directly passes the light exit face and emits, and the light that enters the lens main body inside by second light entrance face is reflected to the light exit face and emits through reflection face. In the utility model, the part center light of light source is supplemented to the side light area, avoids appearing the phenomenon that side light area illumination is too low, and then effectively improves the light beam uniformity of the illuminated surface.

Description

Technical Field

[0001] This utility model relates to the field of lens technology, and in particular to an optical lens and a light source module. Background Technology

[0002] LEDs have advantages such as low power consumption, high efficiency, and long lifespan, and are widely used as light sources in lighting equipment. However, LED light sources have a relatively large divergence angle, and the light energy is strongest at the center. The larger the angle, the weaker the light intensity. Therefore, lighting devices need to incorporate optical lenses to change the light emission angle. Existing optical lenses have aspherical structures on their light-emitting surfaces to refract the light from the center and sides of the LED light source into parallel beams. When the lighting device is used for billboards, three-dimensional walls, etc., the long projection distance between the lighting device and the illuminated surface results in low beam uniformity after the light from the light source is projected onto the illuminated surface by existing optical lenses, which cannot meet the requirements of practical applications. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an optical lens and a light source module to solve the problem of low beam uniformity after long-distance projection of existing optical lenses.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an optical lens, comprising a lens body, the lens body including a light-incident part, a reflective sidewall, and a light-exiting part connected in sequence, the light-incident part having a light-incident groove for accommodating a light source and recessed to one side of the light-exiting part, the bottom of the light-incident groove being a first light-incident surface, and the groove wall being a second light-incident surface; the reflective sidewall having a reflective surface, and the light-exiting part having a light-exiting surface; wherein, light entering the interior of the lens body from the first light-incident surface directly passes through the light-exiting surface and exits, and light entering the interior of the lens body from the second light-incident surface is reflected by the reflective surface to the light-exiting surface and exits.

[0005] Furthermore, in the optical lens described in this utility model, the first incident surface includes a first incident surface and a second incident surface, and the first incident surface and the second incident surface together form a convex curved surface.

[0006] Furthermore, in the optical lens described in this utility model, the second light-incident surface includes a third incident surface and a fourth incident surface, the third incident surface and the fourth incident surface are located on opposite sides of the first light-incident surface, and the third incident surface and the fourth incident surface are inclined relative to the vertical height direction.

[0007] Furthermore, in the optical lens described in this utility model, the tilt angle 'a' of the third incident surface relative to the vertical height direction satisfies: 4°≤a≤5°; and the tilt angle 'b' of the fourth incident surface relative to the vertical height direction satisfies: 4°≤b≤5°.

[0008] Furthermore, in the optical lens described in this utility model, the tilt angle c of the reflecting surface relative to the vertical height direction satisfies: 32°≤c≤39°.

[0009] Furthermore, in the optical lens described in this utility model, the light-emitting surface is a prism.

[0010] Furthermore, the optical lens described in this utility model also includes a mounting part, which is disposed on the lens body.

[0011] Furthermore, in the optical lens described in this utility model, a sealing groove is provided on the lens body, and the sealing groove is arranged around the periphery of the light entrance groove.

[0012] Accordingly, this utility model also provides a light source module, which includes a light source and an optical lens as described above, wherein the light source is disposed at the opening of the light entrance groove of the optical lens.

[0013] Furthermore, the light source module of this utility model also includes a lamp board, which is detachably mounted on the optical lens, and the light source is mounted on the lamp board.

[0014] The beneficial effects of this invention are as follows: Based on the first light-incident surface and the light-exit surface, the central light of the light source can be partially projected onto the central light region and partially onto the side light region. Based on the second light-incident surface, the reflecting surface, and the light-exit surface, the side light of the light source can be projected onto the side light region. Since the side light region is projected by the side light and part of the central light in tandem, it can effectively increase the illumination intensity of the side light region, thereby improving the phenomenon in the prior art where the central light region is excessively bright and the side light region is excessively dim due to excessive central light energy. This effectively improves the uniformity of illumination and reduces the appearance of yellow spots. In other words, the optical lens provided by this invention can correct and output the side light and central light of the light source separately. After long-distance projection, part of the central light of the light source can supplement the illumination area of ​​the side light of the light source, resulting in high beam uniformity on the illuminated surface. It has the advantages of soft, stable, highly uniform, and high light intensity. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the light source module described in this utility model from one perspective in one embodiment.

[0016] Figure 2This is an exploded view of the light source module described in this utility model from one perspective under one embodiment.

[0017] Figure 3 This is a schematic diagram of the optical lens described in this utility model from one perspective in one embodiment.

[0018] Figure 4 This is a partial schematic diagram of a top view of the optical lens described in one embodiment of the present invention.

[0019] Figure 5 for Figure 4 The diagram shows a cross-sectional view of the optical lens shown.

[0020] Figure 6 for Figure 4 The diagram shows a cross-sectional view of the optical lens shown.

[0021] Figure 7 This is a cross-sectional schematic diagram of the optical lens and lamp source combination described in this utility model.

[0022] Figure 8 This is a schematic diagram of the optical path of the optical lens described in this utility model.

[0023] Figure 9 This is another optical path diagram of the optical lens described in this utility model.

[0024] Figure 10 This is a schematic diagram of the projection path of the central light from the optical lens described in this utility model.

[0025] Figure 11 This is a schematic diagram of the light projection path on the left side of the optical lens described in this utility model.

[0026] Figure 12 This is a schematic diagram of the light projection path on the right side of the optical lens described in this utility model.

[0027] Figure 13 This is a schematic diagram of the projection path of the left and right light rays of the optical lens described in this utility model.

[0028] Figure 14 The illuminance distribution of a single lens in a single LED simulation is shown.

[0029] Figure 15 The far-field light intensity distribution of the optical lens is shown in a single LED simulation.

[0030] Figure 16 The illuminance distribution in the whole lamp simulation is shown.

[0031] Figure 17The far-field light intensity distribution of the optical lens is shown in the whole-lamp simulation.

[0032] Figure 18 This is a diagram illustrating the illumination effect of an optical lens under simulated conditions.

[0033] Figure 19 This is a diagram showing the illumination effect of the optical lens under actual measurement conditions.

[0034] Label Explanation: 1. Lens body; 2. Entrance groove; 21. First entrance surface; 22. First incident surface; 23. Second entrance surface; 24. Second entrance surface; 25. Third entrance surface; 26. Fourth entrance surface; 3. Reflective surface; 4. The surface that produces light; 5. Installation Department; 6. Sealing groove; 7. Light panel; 71. Light source. Detailed Implementation

[0035] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0036] Please refer to Figure 1 as well as Figure 3 This utility model provides an optical lens, which includes a light-incident section, a reflective sidewall, and a light-exiting section. The light-incident section has a light-incident groove 2, which is used to accommodate a light source 71 and is recessed to one side of the light-exiting section. The bottom of the light-incident groove 2 is a first light-incident surface 21, and the groove wall of the light-incident groove 2 is a second light-incident surface 24. One end of the reflective sidewall is connected to the light-incident section, and the other end of the reflective sidewall is connected to the light-exiting section. The reflective sidewall has a reflective surface 3. The light-exiting section has a light-exiting surface 4. The light entering the lens from the first light-incident surface 21 is directly emitted through the light-exiting surface 4, and the light entering the lens from the second light-incident surface 24 is reflected by the reflective surface 3 to the light-exiting surface 4 for emission.

[0037] In practical applications, the light source 71 (such as a lamp bead) is placed at the center of the light entrance slot 2 so that the center light and side light of the light source 71 can enter the optical lens through the first light entrance surface 21 and the second light entrance surface 24, respectively. Specifically: (1) Please refer to Figure 8 , Figure 9 as well as Figure 10The central light from light source 71 enters the lens through the first incident surface 21, where it is remixed and then diverged again within the optical lens (between the first incident surface 21 and the exiting surface 4). Because this polarized beam diverges within the lens, the refracted beam from the exiting surface 4 is projected more evenly onto the billboard surface, resulting in a wider illumination area. For example... Figure 9 as well as Figure 10 As shown, part of the central light can supplement the side light illumination area (i.e., the side light area) of the light source 71, thereby making the uniformity of the first concentric beam formed when the central light of the light source 71 is projected onto the billboard surface over a long distance high. (2) At the same time, as Figure 11 , Figure 12 as well as Figure 13 As shown, the side light and stray light of the light source 71 can be refracted to the reflective surface 3 of the reflective sidewall through the second light-incident surface 24. The reflective surface 3 reflects the side light and stray light of the light source 71 so that the side light and stray light of the light source 71 form multiple converging beams (i.e., the second concentric beams) between the reflective surface 3 and the light-emitting surface 4. The multiple converging beams are refracted by the light-emitting surface 4 and projected onto the side light region.

[0038] In summary, based on the first light-incident surface 21 and the light-exiting surface 4, the central light of the light source 71 can be partially projected onto the central light region and partially onto the side light region. Based on the second light-incident surface 24, the reflecting surface 3, and the light-exiting surface 4, the side light of the light source 71 can be projected onto the side light region. Since the side light region is projected by the side light and part of the central light in tandem, it can effectively improve the illumination intensity of the side light region, thereby improving the phenomenon in the prior art where the central light region is too bright and the side light region is too dim due to the excessive energy of the central light. This can effectively improve the uniformity of illumination and reduce the occurrence of yellow spots. That is, the optical lens provided by this invention can correct and output the side light and central light of the light source 71 respectively. After long-distance projection, part of the central light of the light source 71 can supplement the illumination area of ​​the side light of the light source 71, so that the beam uniformity of the illuminated surface is high, and it has the advantages of soft, stable, highly uniform, and high light intensity.

[0039] Furthermore, such as Figure 5 As shown, in the optical lens of this invention, the first incident surface 21 includes a first incident surface 22 and a second incident surface 23, which together form a convex curved surface. It should be noted that designing the first incident surface 22 and the second incident surface 23 as irregular curved surfaces is to refract the light at the center of the LED bead into a gradually changing parallel beam through the curved structure. When the lighting device is applied to billboards, three-dimensional walls, etc., it allows for a gradient light distribution design with high uniformity and high light intensity of the light spot formed on the illuminated surface after the light from the LED bead is projected through the optical lens of this invention.

[0040] In practical applications, such as Figure 5 As shown, the height of the first incident surface 22 in the vertical direction is greater than the height of the second incident surface 23 in the vertical direction, and the connection between the first incident surface 22 and the second incident surface 23 is relatively smooth. In practical applications, the tilt angle of the second incident surface 23 relative to the first horizontal direction can be approximately 23~26°, and the tilt angle of the first incident surface 22 relative to the second horizontal direction can be approximately 33~35°.

[0041] As can be seen from the above description, the curved first incident surface 22 and the second incident surface 23 can more effectively collect the light emitted by the light source 71, thereby increasing the light intensity emitted by the light source 71.

[0042] Furthermore, such as Figure 6 As shown, in the optical lens of this utility model, the second light-incident surface 24 includes a third incident surface 25 and a fourth incident surface 26. The third incident surface 25 and the fourth incident surface 26 are located on opposite sides of the first light-incident surface 21, and the third incident surface 25 and the fourth incident surface 26 are inclined relative to the vertical height direction.

[0043] As can be seen from the above description, by setting the third incident surface 25 and the fourth incident surface 26 on both sides of the first incident surface 21, it is ensured that the side light energy emitted by the light source 71 at a large angle is effectively captured and guided to the reflective sidewall, thereby reducing light loss and spillage and improving light utilization.

[0044] Furthermore, such as Figure 7 As shown, in the optical lens of this utility model, the tilt angle α of the third incident surface 25 relative to the vertical height direction satisfies: 4°≤a≤5°; the tilt angle b of the fourth incident surface 26 relative to the vertical height direction satisfies: 4°≤b≤5°.

[0045] As described above, by limiting the tilt angle range of the third incident surface 25 and the fourth incident surface 26 relative to the vertical height direction, the incident angle of side light and stray light is precisely controlled, ensuring that the light rays hit the reflecting surface 3 along the optimal path and avoiding stray light or ineffective refraction.

[0046] Furthermore, such as Figure 7 As shown, in the optical lens of this utility model, the tilt angle c of the reflecting surface 3 relative to the vertical height direction satisfies: 32°≤c≤39°.

[0047] As described above, by limiting the tilt angle of the reflective surface 3 relative to the vertical height direction, it is ensured that the side light entering through the second light-incident surface 24 can be accurately reflected to the exit side light area, achieving full integration with the center light, improving edge illuminance, and enhancing the uniformity of overall illumination.

[0048] Furthermore, in the optical lens described in this utility model, the light-emitting surface 4 is a prism.

[0049] As can be seen from the above description, by defining the light-emitting surface 4 as a smooth prism, the emitted light is made softer and more uniform based on the diverging effect of the prism of the light-emitting surface 4, thereby reducing the occurrence of yellow spots and bright and dark spots on the illuminated surface.

[0050] Furthermore, such as Figure 6 As shown, the optical lens of this utility model also includes a mounting part 5, which is disposed on the lens body 1.

[0051] As can be seen from the above description, by providing the mounting part 5, the optical lens can be embedded into the housing through the mounting part 5, which facilitates the installation and removal of the optical lens.

[0052] Furthermore, such as Figure 6 As shown, in the optical lens of this utility model, a sealing groove 6 is provided on the lens body 1, and the sealing groove 6 is arranged around the periphery of the light entrance groove 2.

[0053] As described above, by opening a sealing groove 6 around the light inlet groove 2, sealing rings and other components can be installed to prevent dust and moisture from entering the optical cavity, maintain the optical performance of the lens, extend its service life, and improve the reliability and durability of the product.

[0054] Correspondingly, such as Figure 1 as well as Figure 2 As shown, this utility model also provides a light source 71 module, which includes a light source 71 and an optical lens as described above. The light source 71 is disposed at the opening of the light entrance groove 2 of the optical lens.

[0055] Furthermore, the light source 71 module of this utility model also includes a lamp plate 7, which is detachably mounted on the optical lens, and the light source 71 is mounted on the lamp plate 7. In practical applications, a lamp plate 7 can be set on the optical lens, and multiple light sources 71 can be arranged in an array on the lower surface of the lamp plate 7, so that the light source 71 can be located at the opening of the light entrance slot 2.

[0056] Please refer to Figure 3One embodiment of this utility model is as follows: An optical lens includes a lens body 1 and a mounting part 5, which is disposed at the bottom edge of the lens body 1. The cross-section of the lens body 1 is approximately trapezoidal in shape with a recessed notch at the top. A light entrance groove 2 and a sealing groove 6 are formed on the upper surface of the lens body 1. The sealing groove 6 is located around the periphery of the light entrance groove 2. The bottom surface of the lens body 1 is a light exiting surface 4, which is a prismatic surface. The two sides of the trapezoidal lens body 1 are reflective sidewalls, and each of the two reflective sidewalls is provided with a reflective surface 3. The two reflective surfaces 3 are symmetrically arranged, and the inclination angle c of the reflective surface 3 relative to the vertical height direction satisfies: 32°≤c≤39°.

[0057] In this embodiment, as Figure 3 as well as Figure 5 As shown, the light entrance groove 2 is used to accommodate the light source 71 and is recessed towards the light exit surface 4. The light source 71 is placed at the opening of the light entrance groove 2 of the optical lens. Figure 5 As shown, the bottom of the light-incident groove 2 is the first light-incident surface 21, which includes a first incident surface 22 and a second incident surface 23. The first incident surface 22 and the second incident surface 23 together form a convex curved surface. Figure 6 As shown, the wall of the light-incident groove 2 is the second light-incident surface 24. The second light-incident surface 24 includes a third incident surface 25 and a fourth incident surface 26. The third incident surface 25 and the fourth incident surface 26 are located on opposite sides of the first light-incident surface 21, and the third incident surface 25 and the fourth incident surface 26 are inclined relative to the vertical height direction. In practical applications, the inclination angles of the third incident surface 25 and the fourth incident surface 26 are the same.

[0058] In practical applications, the central light entering the lens from the first light-incident surface 21 exits directly through the light-exiting surface 4, while the light rays entering the lens from the second light-incident surface 24 (such as side light or stray light) are reflected by the reflecting surface 3 and exited through the light-exiting surface 4.

[0059] In this embodiment, to verify the actual optical performance of this optical lens in detail, the following analysis and explanation are conducted through simulation and actual measurement comparisons, focusing on three aspects: the effect of a single LED chip, the effect of the entire lamp, and the effect of actual installation and application. The key indicators such as the illuminance, luminous flux efficiency, light distribution, and uniformity of this optical lens are as follows: (1) Simulation of a single LED bead Figure 18The display shows the illuminance distribution of a single lens at a distance of 1 meter, with a maximum illuminance of 0.167 lux and an illuminance uniformity exceeding 50% within a 2m × 1.2m area. The screen collects a total luminous flux of 16,955 lumens, corresponding to a lens light extraction efficiency of 84.77%. If the transmittance of the lens material itself is taken into account (assumed to be 92%), the actual luminous efficacy of the injection-molded product is expected to exceed 82%.

[0060] Figure 19 The far-field light intensity distribution (light distribution curve) of the optical lens is further given. The solid line represents the distribution along the length of the billboard light body, with a half-peak beam angle width of approximately ±40°; the dashed line represents the distribution perpendicular to the length of the billboard, with a half-peak beam angle width of approximately ±20°. The overall light distribution is a slightly polarized batwing shape, which helps to achieve wide and uniform side illumination.

[0061] Based on the actual simulation of the single LED bead, it can be seen that the optical lens of this utility model has excellent optical performance, with a light output efficiency of over 84%, and can form an asymmetric batwing-shaped light distribution (approximately ±40° in the horizontal direction and approximately ±20° in the vertical direction) which is beneficial for billboard lighting. At the same time, the uniformity exceeds 50% within the test range, indicating that this optical lens can effectively improve light utilization and uniformity.

[0062] (2) Simulation effect of the whole lamp In the whole lamp simulation, Figure 16 The display shows a maximum illuminance of 13.36 lux for the light spot at a distance of 1 meter, and a uniformity of over 50% within a 2m x 1.2m area. The screen collects a total luminous flux of 1672.6 lumens, which translates to a lens luminous efficiency of 84.474%. Considering the transmittance of the lens material itself, assuming a transmittance of 92%, the actual efficiency of the injection-molded lens product will exceed 82%.

[0063] Figure 17 The far-field light intensity distribution (light distribution curve) of the optical lens is further given, where: the solid line represents the far-field angular distribution along the length of the billboard light body, with a beam angle width of approximately +40° at half the peak light intensity; the dashed line represents the far-field angular distribution perpendicular to the length of the billboard, with a beam angle width of approximately +20° at half the peak light intensity. The light distribution curve of the lens in the direction perpendicular to the length of the billboard is a slightly polarized batwing distribution.

[0064] Based on the above simulation of the entire lamp, it can be seen that since the efficiency of the entire lamp system remains above 84%, and the light distribution shape and beam angle are highly consistent with those of a single lens, it can be concluded that the lenses have stable performance and good expandability when used in combination, and can meet the overall requirements for spot brightness, uniformity and polarization control in practical applications.

[0065] (3) Comparison of simulated and actual results of the whole lamp To verify the reliability of the simulation results, an actual installation test of the entire lamp was conducted. Under simulated conditions ( Figure 18 The entire light fixture, with an installed power of 15W and a luminous flux of 1950 lm, was placed on top of a billboard 0.6 meters wide × 1.5 meters high. The measured average illuminance was 357 LX, and the uniformity was 0.098. (Measured results) Figure 19 Under the same installation conditions, the overall luminous flux is 1971 lm, the average illuminance is 383 LX, and the uniformity is improved to 0.24.

[0066] The simulated and measured data show consistent trends, with slight differences in uniformity results. The actual uniformity is better, indicating that this lens has good light distribution performance and practical effect in real-world scenarios.

[0067] In summary, the optical lens and light source 71 module provided by this utility model have the following advantages: When the light emitted by the optical lens of this utility model is projected over a long distance and then illuminated, part of the central light from the light source 71 can supplement the illumination area of ​​the side light from the light source 71, resulting in high light intensity and high uniformity on the illuminated surface. Furthermore, the central light, side light, and stray light from the light source 71 are diffused by the facets of the light-emitting surface 4, ensuring that the illuminated surface is free of yellow spots and bright / dark spots. In other words, the optical lens provided by this utility model can correct and output the side light and central light from the light source 71 respectively. When applied to lighting devices on facades such as billboards, the output light has high intensity and high uniformity after long-distance projection, and the illuminated surface will not produce yellow spots or bright / dark spots. This optical lens has the advantages of soft, stable, highly uniform, and high light intensity.

[0068] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An optical lens, comprising a lens body, characterized in that, The lens body includes a light-incident section, a reflective sidewall, and a light-exiting section connected in sequence. The light-incident section has a light-incident groove for accommodating a light source and is recessed towards the light-exiting section. The bottom of the light-incident groove is a first light-incident surface, and the groove wall is a second light-incident surface. The reflective sidewall has a reflective surface, and the light-exiting section has a light-exiting surface. Light entering the lens body from the first light-incident surface is directly emitted through the light-exiting surface, and light entering the lens body from the second light-incident surface is reflected by the reflective surface to the light-exiting surface for emission.

2. The optical lens according to claim 1, characterized in that, The first incident surface includes a first incident surface and a second incident surface, which together form a convex curved surface.

3. The optical lens according to claim 1, characterized in that, The second light-incident surface includes a third incident surface and a fourth incident surface, which are located on opposite sides of the first light-incident surface and are inclined relative to the vertical height direction.

4. The optical lens according to claim 3, characterized in that, The inclination angle 'a' of the third incident surface relative to the vertical height direction satisfies: 4° ≤ a ≤ 5°; the inclination angle 'b' of the fourth incident surface relative to the vertical height direction satisfies: 4° ≤ b ≤ 5°.

5. The optical lens according to claim 1, characterized in that, The tilt angle c of the reflective surface relative to the vertical height direction satisfies: 32°≤c≤39°.

6. The optical lens according to claim 1, characterized in that, The light-emitting surface is a prism.

7. The optical lens according to claim 1, characterized in that, It also includes a mounting part, which is disposed on the lens body.

8. The optical lens according to claim 1, characterized in that, A sealing groove is provided on the lens body, and the sealing groove is arranged around the periphery of the light entrance groove.

9. A light source module, characterized in that, It includes a light source and an optical lens as described in any one of claims 1 to 8, wherein the light source is disposed at the opening of the light entrance groove of the optical lens.

10. The light source module according to claim 9, characterized in that, It also includes a lamp panel, which is detachably mounted on the optical lens, and the light source is mounted on the lamp panel.

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