Reflection type silica gel lens, preparation method thereof and LED light-emitting device

Abstract

The reflective silica gel lens comprises a lens body, a light source cavity is formed in the bottom of the lens body, a light incident surface is arranged on the wall of the light source cavity, a total reflection curved surface is arranged on the top of the lens body, and the section of the total reflection curved surface is of a V-shaped structure. A deep V-shaped cone structure is arranged at the end, close to the light incident face, of the total reflection curved face, the curvature of the total reflection curved face is smaller than that of the deep V-shaped cone structure, the vertex of the deep V-shaped cone structure is located at the central axis of the lens body, and at least one annular protruding structure is arranged on the total reflection curved face. The side wall of the lens body is provided with a light emitting surface, the light emitting surface is arranged between the total reflection curved surface and the light incident surface, through triple improvement of structure-material-process, the divergence angle is increased, the optical effect is improved, large-angle uniform light spots are formed, and the purpose of reducing the use number of chips and silica gel lenses is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of LED display and lighting, and in particular to a reflective silicone lens and a preparation method thereof, and an LED light-emitting device. Background Art

[0002] With the rapid development of display technology, consumers' requirements for LCD TV picture quality have significantly increased, especially in terms of color gamut coverage, color saturation and contrast. The current mainstream LCD TV direct-type TV backlight technology still uses LED chips combined with phosphors to emit light. The basic principle is to use blue LEDs to excite yellow phosphors to mix into white light. Since the phosphor luminescence mechanism relies on secondary spectral conversion, the lack of pure green light components and insufficient purity of monochromatic light lead to limited color gamut, making it difficult to meet the requirements of ultra-high-definition high color gamut standards, and the display effect is limited; and in order to achieve uniform illumination and high brightness, existing high-end LCD TVs need to densely arrange LED chips and use complex lens groups, which leads to excessively high costs. If the chip spacing or the number of lenses is simply reduced, it will easily cause problems such as uneven backlight and local dark areas, thus falling into a technical bottleneck where cost control and optical performance are difficult to balance. Summary of the invention

[0003] In order to solve the above problems, one of the purposes of the present invention is to provide a reflective silicone lens, comprising: a lens body, which is a rotating body of a plane figure rotating around a central axis, a light source-shaped cavity for placing a light source is provided at the bottom of the lens body, and a light incident surface is provided on the wall of the light source-shaped cavity, and the light incident surface satisfies the free surface formula Among them, z represents the height of the curved surface; a total reflection curved surface is arranged on the top of the lens body, and the cross-section of the total reflection curved surface is a V-shaped structure. The V-shaped structure is arranged to extend in an arc shape and tilt toward the outer side of the lens body, and a deep V-shaped cone structure is arranged at one end of the total reflection curved surface close to the light incident surface. The curvature of the total reflection curved surface is smaller than that of the deep V-shaped cone structure, and the apex of the deep V-shaped cone structure is located at the central axis position of the lens body, and at least one annular protrusion structure is arranged on the total reflection curved surface; a light emitting surface is arranged on the side wall of the lens body, and the light emitting surface is arranged between the total reflection curved surface and the light incident surface.

[0004] Preferably, there are 2 to 5 annular protrusion structures, and the annular protrusion structures are arranged continuously.

[0005] Preferably, there are 2 to 5 annular protrusion structures, and the annular protrusion structures are arranged at intervals.

[0006] Preferably, the light emitting surface is formed by a curve rotated around the central axis of the lens body.

[0007] Preferably, sparkle patterns and sawtooth patterns are also provided on the side wall of the lens body, and the sparkle patterns and the sawtooth patterns are alternately provided.

[0008] Preferably, a fan-shaped column foot is also provided at the bottom of the lens body.

[0009] Preferably, a glue overflow groove is further provided at the bottom of the lens body, and the glue overflow groove is radially centered on the light source-shaped cavity.

[0010] Preferably, the light emitting surface is a polished surface with a polishing finish of 5 to 25 nm. The polished surface here means that the surface of the silicone lens is mechanically processed to be very smooth to reduce the roughness and scattering of the silicone lens surface, thereby improving the transmittance and uniformity of light.

[0011] Another object of the present invention is to provide a method for preparing a reflective silicone lens, comprising the following steps: placing 5 to 15 parts of quantum dot phosphor composite particles, 40 to 60 parts of silicone, 10 to 14 parts of hydrogenated silicone oil, 24 to 28 parts of vinyl silicone oil, and 1 to 3 parts of a platinum catalyst in a container according to weight fractions, mixing them evenly, and then heating them to 110 to 130° C. to react for 1 to 2 hours to form a mixed glue, injecting the mixed glue into a molding mold for a silicone lens and evacuating the mold until there are no bubbles visible to the naked eye, and curing the vacuumized mixed glue at 80 to 180° C. for 1 to 2 hours to obtain a reflective silicone lens;

[0012] The preparation process of quantum dot phosphor composite particles includes the following steps:

[0013] In a light-proof environment, 7 to 9 parts of hydrophilic CdSe / ZnS quantum dots, 10 to 16 parts of phosphors (with a particle size range of 0.1 to 0.5 μm), and 12 to 16 parts of nano-titanium dioxide are added to deionized water according to their weight, and treated with an ultrasonic disperser for 0.5 to 1 hour under nitrogen protection to form a uniform suspension, with the power of the ultrasonic disperser being 300 to 500 W; the suspension is heated to 40 to 60° C. in a water bath, and then 45 to 65 parts of polystyrene microspheres are slowly added to the suspension while stirring at a stirring speed of 200 to 400 rpm, and the reaction is carried out for 1 to 2 hours; the temperature is then gradually raised to 60 to 80° C. ℃, then add 3 to 7 parts of vinyl-terminated polydimethylsiloxane and 3 to 7 parts of ammonium polyacrylate to the suspension, adjust the pH of the suspension to 8 to 9 with ammonia water, and shear emulsify at 8000 to 12000 rpm for 10 to 20 min to obtain a mixed system, transfer the mixed system to a vacuum reaction vessel, heat to 80 to 100℃, maintain for 2 to 3 hours to complete the cross-linking reaction, control the pressure of the vacuum reaction vessel at -0.05 to -0.08 MPa, and then spray dry the mixed system after the cross-linking reaction to obtain a primary product, and perform surface passivation treatment on the primary product under a nitrogen atmosphere to obtain quantum dot phosphor composite particles.

[0014] Another object of the present invention is to provide an LED light-emitting device, comprising the above-mentioned reflective silicone lens.

[0015] Beneficial effects:

[0016] This application increases the divergence angle and improves the optical effect through triple improvements in structure, material and process, forming a uniform light spot with a large angle, thereby reducing the number of chips and silicone lenses used. The divergence angle of the improved silicone lens is nearly 30° larger than that of the traditional silicone lens, and the color temperature uniformity ΔCCT < 100K;

[0017] 1. In terms of structure, firstly, the incident angle of the light source is controlled by designing a light-entering surface with a special angle. Secondly, the deep V-shaped cone structure is set on the silicone lens, which can not only focus and diffuse the central light source, but also the steep side wall can make the axial light reflect twice, which complements the total reflection surface with a smaller curvature. In addition, the annular protrusion is set to form a Fresnel-type phase delay phenomenon, reduce the interference effect, and greatly improve the uniformity of the light spot. At the same time, the alternately set spark pattern and sawtooth pattern can produce a diffraction grating effect, decomposing a single exit angle into multiple diffraction angles. Combined with the rotationally symmetrical design, the divergence angle can be close to 150°. The total reflection surface with a V-shaped cross-section and the V-shaped structure extending in an arc shape toward the outside of the lens body can bend the edge light to a large angle direction, and with the negative spherical aberration compensation of the light exit surface, the edge of the light spot is softer.

[0018] 2. In terms of materials, the quantum dot phosphor composite particles prepared in this application can effectively change the propagation direction of light and significantly increase the divergence angle through the light absorption and re-emission of quantum dots and phosphors, combined with the scattering effect of nano-titanium dioxide and polystyrene microspheres. At the same time, the addition of vinyl-terminated polydimethylsiloxane and ammonium polyacrylate can ensure that quantum dots and phosphors are stably dispersed in polystyrene microspheres, achieving uniform distribution of light.

[0019] 3. In terms of technology, the alkoxy groups in the vinyl-terminated polydimethylsiloxane can be hydrolyzed to generate silanol (Si-OH), which then undergoes a condensation reaction with the silanol on the surface of the silica gel to form a silicon-oxygen-silicon bond (Si-O-Si), thereby increasing the compatibility of the quantum dot phosphor composite particles with the silica gel. At the same time, by adding vinyl silicone oil and co-crosslinking with the silica gel, the quantum dot phosphor composite particles are further anchored in the silica gel network, thereby preventing the quantum dot phosphor composite particles from migrating or agglomerating during the curing process of the silica gel, and allowing the quantum dot phosphor composite particles to be stably dispersed in the silica gel network for a long time. When these quantum dot phosphor composite particles are embedded in the silica gel lens, the propagation path of the incident light will be changed, causing the light to be reflected and refracted multiple times inside the silica gel lens, making the energy distribution of the light more uniform, thereby forming a uniform light spot at a large angle.

[0020] In summary, after the quantum dot phosphor composite particles are embedded in the silicone lens, the light enters the silicone lens through the light incident surface at a special angle, and then is repeatedly changed by the quantum dot phosphor composite particles to change the propagation path of the light, and then goes out from the total reflection surface and the light output surface. In this way, the quantum dot phosphor composite particles and the silicone lens structure work together to finally form a uniform light spot at a large angle, successfully achieving the goal of reducing the number of chips and silicone lenses used. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of the reflective silicone lens of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the reflective silicone lens of the present application from another viewing angle;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the reflective silicone lens of this application;

[0025] Figure 4 A comparison photo of the light spot effect between an existing reflective silicone lens and a reflective silicone lens prepared in Example 2 of the present application;

[0026] In the figure: 1. lens body; 2. light incident surface; 3. total reflection curved surface; 31. annular convex structure; 4. deep V-shaped cone structure; 5. light emitting surface; 6. fan-shaped column foot; 7. glue overflow groove. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0028] The following embodiments are only used to illustrate the present invention, but are not limited to the scope of the present invention. Based on the specific embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work belong to the protection scope of the present invention.

[0029] In the examples of the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art; in the examples of the present invention, unless otherwise specified, the technical means used are conventional means well known to those skilled in the art.

[0030] Source of raw materials:

[0031] Hydrogenated silicone oil was purchased from Shandong Juneng Chemical Co., Ltd.

[0032] Vinyl silicone oil was purchased from Shandong Dayi Chemical Co., Ltd.;

[0033] Hydrophilic CdSe / ZnS quantum dots were purchased from Xi’an Ruixi Biotechnology Co., Ltd.;

[0034] Phosphor was purchased from Shenzhen Yaodexing Technology Co., Ltd.;

[0035] Nano-titanium dioxide was purchased from Zhejiang Manli Nanotechnology Co., Ltd.;

[0036] Polystyrene microspheres were purchased from Jiangsu Xianfeng Nanomaterials Technology;

[0037] Vinyl-terminated polydimethylsiloxane was purchased from Green Union (Jining) Chemical Technology Co., Ltd.

[0038] Ammonium polyacrylate was purchased from Bashifu (Shanghai) Biopharmaceutical Technology Co., Ltd.

[0039] The remaining reagents are commercially available.

[0040] Example 1

[0041] See also Figures 1 to 3 , Figure 1 This is a schematic diagram of the overall structure of the reflective silicone lens of this application. Figure 2 This is a schematic diagram of the structure of the reflective silicone lens of this application from another viewing angle. Figure 3 This is a schematic diagram of the cross-sectional structure of the reflective silicone lens of the present application. This embodiment provides a reflective silicone lens, comprising: a lens body 1, which is a rotating body of a plane figure rotating around a central axis, a light source-shaped cavity for placing a light source is provided at the bottom of the lens body, and a light incident surface 2 is provided on the wall of the light source-shaped cavity, and the light incident surface 2 satisfies the free surface formula Wherein, z represents the height of the curved surface; a total reflection curved surface 3 is arranged on the top of the lens body 1, and the cross section of the total reflection curved surface 3 is a V-shaped structure, and the V-shaped structure is arranged to extend in an arc shape and tilt toward the outer side of the lens body 1, and a deep V-shaped cone structure 4 is arranged at one end of the total reflection curved surface 3 close to the light incident surface 2, and the curvature of the total reflection curved surface 3 is smaller than that of the deep V-shaped cone structure 4, and the vertex of the deep V-shaped cone structure 4 is located at the central axis position of the lens body 1, and at least one annular convex structure 31 is arranged on the total reflection curved surface 3. In this embodiment, there are two annular convex structures 31, and the annular convex structures 31 are arranged at least one annular convex structure 31. The structure 31 is continuously arranged; a light emitting surface 5 is arranged on the side wall of the lens body 1, and the light emitting surface 5 is a polished surface or a mirror surface with a polishing finish of 25nm. The light emitting surface 5 is formed by a curve rotating around the central axis of the lens body, and the light emitting surface 5 is arranged between the total reflection curved surface 3 and the light incident surface 2. Spark patterns and sawtooth patterns are also arranged on the side wall of the lens body 1, and the spark patterns and sawtooth patterns are arranged alternately. A fan-shaped column foot 6 and an overflow glue groove 7 are also provided at the bottom of the lens body 1. The bottom texture of the fan-shaped column foot 6 is a frosted surface to increase the friction and push-pull force of the lens, and the overflow glue groove 7 is radial with the light source shaped cavity as the center.

[0042] The above-mentioned method for preparing a reflective silicone lens comprises the following steps: placing 5 parts of quantum dot phosphor composite particles, 60 parts of silicone, 10 parts of hydrogenated silicone oil, 24 parts of vinyl silicone oil, and 1 part of a platinum catalyst in a container according to weight proportions, mixing them evenly, and then heating them to 110° C. to react for 1 hour to form a mixed glue, injecting the mixed glue into a molding mold for a silicone lens and evacuating the mold until there are no bubbles visible to the naked eye, and curing the vacuumized mixed glue at 80° C. for 2 hours to obtain the reflective silicone lens;

[0043] The process for preparing the quantum dot phosphor composite particles comprises the following steps:

[0044] In a light-proof environment, 7 parts of hydrophilic CdSe / ZnS quantum dots, 10 parts of phosphor (particle size range is 0.1 μm), and 12 parts of nano-titanium dioxide are added to deionized water according to their weight fractions, and treated with an ultrasonic disperser for 0.5 h under nitrogen protection to form a uniform suspension, the power of which is 300 W; the suspension is heated to 40° C. in a water bath, and then 65 parts of polystyrene microspheres are slowly added to the suspension while stirring, the stirring speed is 200 rpm, and the reaction is carried out for 1 hour; then the temperature is gradually raised to 60° C., and then the suspension is heated to 40° C., and then the suspension is heated to 200 rpm. 3 parts of vinyl-terminated polydimethylsiloxane and 3 parts of ammonium polyacrylate are added to the suspension, and the pH of the suspension is adjusted to 8-9 with ammonia water, and shear emulsification is performed at 8000rpm for 20 minutes to obtain a mixed system, and the mixed system is transferred to a vacuum reaction container, heated to 80°C, and maintained for 2 hours to complete the cross-linking reaction. The pressure of the vacuum reaction container is controlled at -0.05MPa, and the mixed system after the cross-linking reaction is spray-dried to obtain a primary product, and the primary product is subjected to surface passivation treatment under a nitrogen atmosphere to obtain the quantum dot phosphor composite particles.

[0045] This embodiment also provides an LED light-emitting device, including the above-mentioned reflective silicone lens.

[0046] Example 2

[0047] The difference between this embodiment and embodiment 1 is that in this embodiment, there are three annular protruding structures 31, the annular protruding structures 31 are arranged at intervals, and the polishing finish of the light-emitting surface is 5nm. The preparation method of the reflective silicone lens includes the following steps: 10 parts of quantum dot phosphor composite particles, 50 parts of silicone, 12 parts of hydrogenated silicone oil, 26 parts of vinyl silicone oil, and 2 parts of platinum catalyst are placed in a container according to mass fractions, mixed evenly, and then heated to 120°C to react for 1.5 hours to form a mixed glue, the mixed glue is injected into the molding mold of the silicone lens and evacuated until there are no bubbles visible to the naked eye, and the vacuumed mixed glue is cured at 130°C for 1.5 hours to obtain the reflective silicone lens;

[0048] The process for preparing the quantum dot phosphor composite particles comprises the following steps:

[0049] In a light-proof environment, 8 parts of hydrophilic CdSe / ZnS quantum dots, 13 parts of phosphor (particle size range is 0.3 μm), and 14 parts of nano-titanium dioxide are added to deionized water according to their weight fractions, and treated with an ultrasonic disperser for 0.75 h under nitrogen protection to form a uniform suspension, the power of the ultrasonic disperser is 400 W; the suspension is heated to 50° C. in a water bath, and then 55 parts of polystyrene microspheres are slowly added to the suspension while stirring, the stirring speed is 300 rpm, and the reaction is carried out for 1.5 hours; then the temperature is gradually raised to 70° C., and then the suspension is heated to 400 W. 5 parts of vinyl-terminated polydimethylsiloxane and 5 parts of ammonium polyacrylate are added to the suspension, and the pH value of the suspension is adjusted to 8-9 with ammonia water, and shear emulsification is performed at 10000 rpm for 15 minutes to obtain a mixed system, and the mixed system is transferred to a vacuum reaction container, and the temperature is raised to 90° C. and maintained for 2.5 hours to complete the cross-linking reaction. The pressure of the vacuum reaction container is controlled at -0.07 MPa, and the mixed system after the cross-linking reaction is spray-dried to obtain a primary product, and the primary product is subjected to surface passivation treatment under a nitrogen atmosphere to obtain the quantum dot phosphor composite particles.

[0050] Example 3

[0051] The difference between this embodiment and embodiment 1 is that in this embodiment, there are 5 annular protrusion structures 31, the annular protrusion structures 31 are arranged continuously, and the polishing finish is 15nm. The above-mentioned method for preparing a reflective silicone lens comprises the following steps: 15 parts of quantum dot phosphor composite particles, 40 parts of silicone, 14 parts of hydrogenated silicone oil, 28 parts of vinyl silicone oil, and 3 parts of platinum catalyst are placed in a container according to mass fractions, mixed evenly, and then heated to 130°C for reaction for 2 hours to form a mixed glue, the mixed glue is injected into a molding mold of a silicone lens and evacuated until there are no bubbles visible to the naked eye, and the vacuumized mixed glue is cured at 180°C for 1 hour to obtain the reflective silicone lens;

[0052] The process for preparing the quantum dot phosphor composite particles comprises the following steps:

[0053] In a light-proof environment, 9 parts of hydrophilic CdSe / ZnS quantum dots, 16 parts of phosphors (with a particle size range of 0.5 μm), and 16 parts of nano-titanium dioxide were added to deionized water according to their weight fractions, and treated with an ultrasonic disperser for 1 hour under nitrogen protection to form a uniform suspension, the power of which was 500 W; the suspension was heated to 60° C. in a water bath, and 45 parts of polystyrene microspheres were slowly added to the suspension while stirring at a stirring speed of 400 rpm, and the reaction was carried out for 2 hours; the temperature was gradually raised to 80° C., and then the suspension was added to the 7 parts of vinyl-terminated polydimethylsiloxane and 7 parts of ammonium polyacrylate are added, and the pH value of the suspension is adjusted to 8-9 with ammonia water, and shearing and emulsifying is performed at 12000rpm for 10 minutes to obtain a mixed system, and the mixed system is transferred to a vacuum reaction container, and the temperature is raised to 100°C and maintained for 3 hours to complete the cross-linking reaction. The pressure of the vacuum reaction container is controlled at -0.08MPa, and the mixed system after the cross-linking reaction is spray-dried to obtain a primary product, and the primary product is subjected to surface passivation treatment under a nitrogen atmosphere to obtain the quantum dot phosphor composite particles.

[0054] Comparative Example 1

[0055] The difference between this comparative example and Example 2 is that no hydrogen-containing silicone oil and vinyl silicone oil are added during the preparation of the reflective silicone lens, and the other components and experimental steps are the same as those in Example 2.

[0056] Comparative Example 2

[0057] The difference between this comparative example and Example 2 is that no vinyl-terminated polydimethylsiloxane is added during the preparation of the reflective silicone lens, and the other components and experimental steps are the same as those in Example 2.

[0058] Comparative Example 3

[0059] The difference between this comparative example and Example 2 is that no quantum dot phosphor composite particles are added during the preparation of the reflective silicone lens.

[0060] Comparative Example 4

[0061] This comparative example is an existing reflective silicone lens purchased from Dongguan Dengfeng Optical Technology Co., Ltd.

[0062] The performance of the silicone lenses obtained in Examples 1 to 3 and Comparative Examples 1 to 4 was tested, and each sample was tested 3 times to take the average value.

[0063] Test method:

[0064] The divergence angle is tested according to GB / T 24824-2009 standard;

[0065] Color temperature uniformity is tested according to GB / T 24908-2010 standard;

[0066] The test results are shown in Table 1.

[0067]

[0068] The experimental data show that the reflective silicone lens prepared in each embodiment of the present application can form a large-angle uniform light spot, and its divergence angle is nearly 30° larger than that of the existing reflective silicone lens (Comparative Example 4), and the color temperature value reaches more than 10000, the color is bluish white, giving people a bright and cool feeling, and the color temperature uniformity difference ΔCCT <100K. During the experiment, it was observed that the edge of the light spot was soft and uniform, and the attached Figure 4 The following is a comparison photo of the light spot effect of the existing reflective silicone lens and the reflective silicone lens prepared in Example 2 of the present application. It can be seen that the light spot formed in Example 2 of the present application is larger and more uniform than that in Example 4, with softer edges, achieving the expected design goal. Further analysis of the experimental data shows that the divergence angle of Example 1 is significantly reduced, while the difference in the uniformity of the light spot color temperature is significantly increased. This may be because after Example 1 lacks hydrogen-containing silicone oil and vinyl silicone oil, the quantum dot phosphor composite particles cannot be anchored in the silicone network, resulting in a decrease in the divergence angle of the silicone lens and a deterioration in the uniformity of the light spot color temperature, and a large-angle uniform light spot cannot be formed. However, since comparative example 2 lacks terminal vinyl polydimethylsiloxane, it cannot undergo addition cross-linking reaction with ammonium polyacrylate to form a stable three-dimensional siloxane network structure. When quantum dots, phosphors and nano-titanium dioxide are attached to the surface of polystyrene microspheres by physical adsorption or electrostatic action, the lack of a three-dimensional siloxane network structure makes it impossible for components such as quantum dots, phosphors and nano-titanium dioxide to be effectively fixed on the surface of polystyrene microspheres. They are easily fallen off from the surface of polystyrene microspheres during subsequent stirring, spray drying and other processes, resulting in uneven particle size of the quantum dot phosphor composite particles, which in turn leads to a decrease in the divergence angle of the silicone lens and a deterioration in the uniformity of the color temperature of the light spot. In comparative example 3, quantum dot phosphor composite particles are not added, only for the purpose of investigating the influence of the reflective silicone lens structure on the divergence angle and the uniformity of the color temperature of the light spot. From the experimental data, it can be seen that after the quantum dot phosphor composite particles are not added, the divergence angle and the uniformity of the color temperature of the light spot of the silicone lens are better than those of comparative examples 1, 2 and 4, but not as good as those of embodiments 1 to 3, which means that although the divergence angle can be enlarged and the uniformity of the color temperature of the light spot can be improved to a certain extent by improving the silicone lens structure, if the quantum dot phosphor composite particles are added, they will synergize with the silicone lens structure to achieve the superposition of light effects. In addition, the color temperature of comparative example 3 is greater than that of embodiments 1 to 3. This may be because there is a lack of quantum dot phosphor composite particles to effectively convert and regulate the wavelength of light, which changes the spectral distribution of the light and increases the blue light component, thereby increasing the color temperature.

[0069] In summary, this application increases the divergence angle, improves the optical effect, and forms a uniform light spot at a large angle through triple improvements in structure, material, and process, thereby achieving the purpose of reducing the number of chips and silicone lenses used. The divergence angle of the improved silicone lens is expanded by nearly 30° compared to the traditional silicone lens, and the color temperature uniformity ΔCCT is less than 100K.

[0070] The above is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A reflective silicone lens, characterized in that: include: The lens body (1) is a rotating body of a plane figure rotating around a central axis. The bottom of the lens body is provided with a light source-shaped cavity for placing a light source. The wall of the light source-shaped cavity is provided with a light incident surface (2). The light incident surface (2) satisfies the free surface formula wherein z represents the height of the curved surface; a total reflection curved surface (3) is arranged on the top of the lens body (1); the cross section of the total reflection curved surface (3) is a V-shaped structure; the V-shaped structure is arranged to extend in an arc shape and tilt toward the outer side of the lens body (1); a deep V-shaped cone structure (4) is arranged at one end of the total reflection curved surface (3) close to the light incident surface (2); the curvature of the total reflection curved surface (3) is smaller than that of the deep V-shaped cone structure (4); the apex of the deep V-shaped cone structure (4) is located at the central axis position of the lens body (1); and at least one annular protrusion structure (31) is arranged on the total reflection curved surface (3); a light emitting surface (5) is arranged on the side wall of the lens body (1); the light emitting surface (5) is arranged between the total reflection curved surface (3) and the light incident surface (2).

2. The reflective silicone lens according to claim 1, characterized in that: The number of the annular protrusion structures (31) is 2 to 5, and the annular protrusion structures (31) are arranged continuously.

3. The reflective silicone lens according to claim 1, characterized in that: There are 2 to 5 annular protrusion structures (31), and the annular protrusion structures (31) are arranged at intervals.

4. The reflective silicone lens according to claim 1, characterized in that: The light emitting surface (5) is formed by a curve rotated around the central axis of the lens body.

5. The reflective silicone lens according to claim 1, characterized in that: The side wall of the lens body (1) is also provided with sparkle patterns and sawtooth patterns, and the sparkle patterns and the sawtooth patterns are arranged alternately.

6. The reflective silicone lens according to claim 1, characterized in that: The bottom of the lens body (1) is also provided with a fan-shaped column foot (6).

7. The reflective silicone lens according to claim 1, characterized in that: The bottom of the lens body (1) is also provided with a glue overflow groove (7), and the glue overflow groove (7) is radially arranged with the light source-shaped cavity as the center.

8. The reflective silicone lens according to claim 1, characterized in that: The light emitting surface (5) is a polished surface with a polishing finish of 5 to 25 nm.

9. A method for preparing a reflective silicone lens as claimed in claim 1, characterized in that: The method comprises the following steps: placing 5 to 15 parts of quantum dot phosphor composite particles, 40 to 60 parts of silica gel, 10 to 14 parts of hydrogenated silicone oil, 24 to 28 parts of vinyl silicone oil, and 1 to 3 parts of a platinum catalyst in a container according to weight proportions, mixing them evenly, and then heating them to 110 to 130° C. to react for 1 to 2 hours to form a mixed glue; injecting the mixed glue into a molding mold for a silicone lens and evacuating the mold until there are no bubbles visible to the naked eye; and curing the vacuumized mixed glue at 80 to 180° C. for 1 to 2 hours to obtain the reflective silicone lens; The process for preparing the quantum dot phosphor composite particles comprises the following steps: In a light-proof environment, 7 to 9 parts of hydrophilic CdSe / ZnS quantum dots, 10 to 16 parts of phosphors (with a particle size range of 0.1 to 0.5 μm), and 12 to 16 parts of nano-titanium dioxide are added to deionized water according to their weight fractions, and treated with an ultrasonic disperser for 0.5 to 1 hour under nitrogen protection to form a uniform suspension, wherein the power of the ultrasonic disperser is 300 to 500 W; the suspension is heated to 40 to 60° C. in a water bath, and then 45 to 65 parts of polystyrene microspheres are slowly added to the suspension while stirring, and the stirring speed is 200 to 400 rpm, and the reaction is carried out for 1 to 2 hours; the temperature is then gradually raised to 60 to 80° C., and then 3 to 7 parts of vinyl-terminated polydimethylsiloxane and 3 to 7 parts of ammonium polyacrylate are added to the suspension, and the pH value of the suspension is adjusted to 8 to 9 with ammonia water, and shear emulsification is performed at 8000 to 12000 rpm for 10 to 20 minutes to obtain a mixed system, the mixed system is transferred to a vacuum reaction container, the temperature is increased to 80 to 100° C., and the cross-linking reaction is completed for 2 to 3 hours. The pressure of the vacuum reaction container is controlled at -0.05 to -0.08 MPa, and the mixed system after the cross-linking reaction is spray-dried to obtain a primary product, and the primary product is subjected to surface passivation treatment under a nitrogen atmosphere to obtain the quantum dot phosphor composite particles.

10. An LED light emitting device, characterized in that: It comprises the reflective silicone lens as claimed in claim 1.

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