COB light source and lighting device

Abstract

The utility model discloses a COB light source and a lighting device. The COB light source comprises a substrate and an LED chip. A circular light-emitting area and an annular light-emitting area are arranged on the substrate, the circular light-emitting area and the annular light-emitting area are concentric, the inner diameter of the annular light-emitting area is larger than the diameter of the circular light-emitting area, and fluorescent powder is arranged in the circular light-emitting area and the annular light-emitting area; the LED chips are arranged in the circular light-emitting area and the annular light-emitting area and used for exciting the fluorescent powder to emit light. According to the COB light source, the circular light-emitting area and the annular light-emitting area which are concentric are arranged on the substrate to arrange the fluorescent powder, and the inner diameter of the annular light-emitting area is larger than the diameter of the circular light-emitting area, so that the whole fluorescent powder is annularly arranged around the circle on the substrate, and the color gamut of mixed light becomes wider compared with a traditional COB light source; after the fluorescent powder is excited by the LED chip, the light emitting effect of mixed color light emitted by the whole fluorescent powder is better, and the lighting requirements of more scenes can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of LEDs, in particular to a COB light source and a lighting device. Background Art

[0002] At present, COB light sources are widely used in our lives. COB (Chip on Board) light source technology is a high-efficiency integrated surface light source technology that directly attaches LED chips to a high-reflectivity mirror metal substrate. The structural design of the COB light source is very important, and the quality of the COB light source structure will directly affect the lighting effect of the lamp. The different color temperature displays of the COB light source are controlled by different phosphor types and the proportion of the configured phosphors. The traditional COB light source adopts a strip design due to the regional distribution structure of different phosphors on the substrate. There are structural limitations, which makes the color gamut of the mixed light narrow and the light output effect of the mixed color light poor, making it difficult to meet the lighting needs in some specific scenes. Utility Model Content

[0003] The embodiments of the utility model provide a COB light source and a lighting device, which solve the problem that the existing COB light source has a narrow light mixing color gamut resulting in poor light output effect.

[0004] In a first aspect, an embodiment of the utility model provides a COB light source, which includes:

[0005] A substrate, on which a circular light-emitting area and an annular light-emitting area are provided, wherein the annular light-emitting area is concentric with the circular light-emitting area, and the inner diameter of the annular light-emitting area is larger than the diameter of the circular light-emitting area, and phosphors are provided in both the circular light-emitting area and the annular light-emitting area;

[0006] LED chips are arranged in the circular light-emitting area and the annular light-emitting area to excite the fluorescent powder to emit light.

[0007] In the COB light source provided in the embodiment of the utility model, the annular light-emitting area includes a first annular light-emitting area and a second annular light-emitting area, the inner diameter of the first annular light-emitting area is larger than the diameter of the circular light-emitting area, and the inner diameter of the second annular light-emitting area is larger than the outer diameter of the first annular light-emitting area.

[0008] In the COB light source provided by the embodiment of the utility model, the phosphors in the circular light-emitting area, the first annular light-emitting area, and the second annular light-emitting area are cyan phosphors, yellow-green phosphors, and red phosphors, respectively.

[0009] In the COB light source provided by the embodiment of the utility model, the peak wavelength of the yellow-green phosphor is in the range of 480nm to 495nm, the peak wavelength of the cyan phosphor is in the range of 530nm to 550nm, and the peak wavelength of the red phosphor is in the range of 625nm to 645nm.

[0010] In a second aspect, an embodiment of the utility model provides a lighting device, the lighting device comprising:

[0011] case;

[0012] A COB light source is provided in the housing;

[0013] Wherein, the COB light source is any one of the COB light sources provided in the embodiments of the utility model.

[0014] In the lighting device provided by the embodiment of the utility model, the lighting device also includes a mixing lens, which is arranged in the shell and located above the COB light source. The side of the mixing lens facing the COB light source is concave to form a circular convex surface, and the side of the mixing lens away from the COB light source is concave to form a circular plane. A convex lens is defined between the circular convex surface and the circular plane, and the main optical axis of the convex lens is coaxial with the circular light-emitting area and the annular light-emitting area of ​​the COB light source.

[0015] In the lighting device provided by the embodiment of the utility model, the ratio of the diameter of the circular plane to the outer diameter of the annular light-emitting area of ​​the COB light source is greater than 6.

[0016] In the lighting device provided by the embodiment of the utility model, compound eyes distributed in clusters are convexly provided on both the circular convex surface and the circular plane.

[0017] In the lighting device provided in the embodiment of the utility model, the lighting device also includes a diffusion film for diffusing light, the diffusion film is arranged in the shell and covers the side of the mixing lens away from the COB light source, wherein the haze range of the diffusion film is 10% to 90%.

[0018] In the lighting device provided in the embodiment of the utility model, the lighting device also includes an anti-glare tube, one end of the anti-glare tube is arranged on the side of the mixing lens away from the COB light source, and the other end is exposed outside the shell, and the diameter of the anti-glare tube gradually expands from one end to the other end along its axial direction.

[0019] The embodiment of the utility model provides a COB light source and a lighting device, the COB light source includes a substrate and an LED chip; the substrate is provided with a circular light-emitting area and an annular light-emitting area, the annular light-emitting area is concentric with the circular light-emitting area, and the inner diameter of the annular light-emitting area is larger than the diameter of the circular light-emitting area, and phosphors are provided in the circular light-emitting area and the annular light-emitting area; the LED chip is arranged in the circular light-emitting area and the annular light-emitting area to excite the phosphors to emit light. The present application arranges concentric circular light-emitting areas and annular light-emitting areas on the substrate to arrange the phosphors, the inner diameter of the annular light-emitting area is larger than the diameter of the circular light-emitting area, so that the phosphors as a whole form a ring-shaped layout surrounding a circle on the substrate, the color gamut of the mixed light becomes wider than that of the traditional COB light source, and the mixed color light emitted by the phosphors as a whole after being excited by the LED chip has a better light-emitting effect, which can meet the lighting needs of more scenes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a COB light source provided by an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the structure of a COB light source provided by an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the color coordinates of the COB light source provided in the embodiment of the utility model in the CIE 1931 color space;

[0024] Figure 4 A schematic diagram of the structure of the lighting device provided by the embodiment of the utility model;

[0025] The reference numerals in the figures are:

[0026] 100, COB light source; 10, substrate; 11, circular light-emitting area; 12, annular light-emitting area; 120, first annular light-emitting area; 121, second annular light-emitting area; 20, LED chip; 30, electrode; 40, housing; 50, light-mixing lens; 51, convex lens; 510, circular convex surface; 511, circular plane; 60, diffusion membrane; 70, anti-glare tube. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only for reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0029] Reference Figure 1 and Figure 2 , which shows an embodiment of the COB light source provided by the utility model. The structure and working principle of the COB light source are described in detail below in conjunction with the drawings of the specification. The COB light source comprises a substrate 10 and an LED chip 20; the substrate 10 is provided with a circular light-emitting area 11 and an annular light-emitting area 12, the annular light-emitting area 12 is concentric with the circular light-emitting area 11, and the inner diameter of the annular light-emitting area 12 is greater than the diameter of the circular light-emitting area 11, and phosphors are provided in the circular light-emitting area 11 and the annular light-emitting area 12; the LED chip 20 is provided in the circular light-emitting area 11 and the annular light-emitting area 12 to excite the phosphors to emit light.

[0030] In a specific implementation, the substrate 10 is a plate-like structure with high reflectivity, which is usually designed with ceramic or aluminum. The overall area of ​​the substrate 10 is determined according to the light-emitting area planned thereon. The circular light-emitting area 11 and the annular light-emitting area 12 are both areas planned on the substrate 10. The circular light-emitting area 11 is a standard circular area, and the annular light-emitting area 12 is a standard circular ring area. The annular light-emitting area 12 is concentrically arranged with the circular light-emitting area 11, and the inner diameter of the annular light-emitting area 12 is greater than the diameter of the circular light-emitting area 11. The inner ring of the annular light-emitting area 12 is evenly spaced a certain distance from the outer circle of the circular light-emitting area 11. On the whole, the annular light-emitting area 12 surrounds the periphery of the circular light-emitting area 11. There is no limit on the number of annular light-emitting areas 12. When multiple annular light-emitting areas 12 are provided, the inner diameter and outer diameter of each annular light-emitting area 12 are not equal to each other, so that each annular light-emitting area 12 does not overlap with each other, forming a layout of one ring inside another on the substrate 10. In this embodiment, a plurality of tiny LED chips 20 are mounted in the circular light-emitting area 11 and the annular light-emitting area 12, and phosphors of different types and proportions are filled and set. The LED chips are arranged in the circular light-emitting area and the annular light-emitting area according to specific rules, and the phosphors are evenly covered on the LED chips. The substrate 10, the LED chips 20 and the phosphors are packaged as a whole by external sealing glue. Each LED chip 20 is a tiny light source that can convert electrical energy into light energy. The LED chip 20 is connected to the electrode 30 on the substrate 10, and the electrode 30 is connected to the corresponding control circuit for control. Phosphor is a luminescent material that can convert blue light or other short-wavelength light emitted by the LED chip 20 into long-wavelength light. Under the excitation of the LED chip 20, the phosphor is excited by the LED chip 20 to generate light of the corresponding wavelength. The LED chips 20 and phosphors in the circular light-emitting area 11 and the annular light-emitting area 12 can be adjusted according to needs. By adjusting phosphors of different types and different peak wavelengths in the circular light-emitting area 11 and the annular light-emitting area 12, the phosphors are distributed in the shape of a circle plus annulus. The circular light-emitting area 11 and the annular light-emitting area 12 each correspond to a different color temperature. By customizing the coordinate points of the color temperatures corresponding to the circular light-emitting area 11 and the annular light-emitting area 12, a dynamic spectrum with a wide color gamut can be easily adjusted, and the light output quality of the mixed light is higher.

[0031] In this embodiment, the phosphor is arranged by setting concentric circular light-emitting areas and annular light-emitting areas on the substrate. The inner diameter of the annular light-emitting area is larger than the diameter of the circular light-emitting area, so that the phosphor as a whole forms a ring-shaped layout surrounding the circle on the substrate. The color gamut of the mixed light becomes wider than that of the traditional COB light source. After the phosphor is excited by the LED chip, the overall mixed color light emitted has a better light-emitting effect, which can meet the lighting needs of more scenes.

[0032] In one embodiment, referring to Figure 2 , the annular light-emitting area 12 includes a first annular light-emitting area 120 and a second annular light-emitting area 121, the inner diameter of the first annular light-emitting area 120 is greater than the diameter of the circular light-emitting area 11, and the inner diameter of the second annular light-emitting area 121 is greater than the outer diameter of the first annular light-emitting area 120. In a specific implementation, the annular light-emitting area 12 is designed into two annular areas, namely the first annular light-emitting area 120 and the second annular light-emitting area 121, the inner diameter of the first annular light-emitting area 120 is greater than the diameter of the circular light-emitting area 11, the inner diameter of the second annular light-emitting area 121 is greater than the outer diameter of the first annular light-emitting area 120, and both the first annular light-emitting area 120 and the second annular light-emitting area 121 are concentric with the circular light-emitting area 11, so that a regional structure with the circular light-emitting area 11 as the center, the first annular light-emitting area 120 surrounding the circular light-emitting area 11, and the second annular light-emitting area 121 surrounding the first annular light-emitting area 120 is formed on the substrate 10. Different types and proportions of phosphors are respectively prepared in the circular light-emitting area 11, the first annular light-emitting area 120, and the second annular light-emitting area 121. Each of the three areas corresponds to a color temperature. Different proportions of phosphors of the three primary colors of RGB can be prepared in the three areas. The three primary colors of RGB include primary colors R, primary colors G, and primary colors B. In the three areas of the circular light-emitting area 11, the first annular light-emitting area 120, and the second annular light-emitting area 121, one area corresponds to a phosphor of a primary color. By using the three-primary color three-in-one method, the peak wavelengths of the three phosphors in the three areas are selected according to actual needs, and high-quality white light can be adjusted. It is also possible to mix and prepare the RGB three-primary color phosphors in each area. For example, in the three areas of the circular light-emitting area 11, the first annular light-emitting area 120, and the second annular light-emitting area 121, the phosphors in each area are freely mixed with phosphors of the primary colors R, primary colors B, and primary colors G in different proportions. When the phosphors of primary colors R, B, and G are freely mixed in a certain proportion, such as Figure 3 As shown, in this embodiment, a color space formed by connecting the coordinate points of the three primary colors on the CIE 1931 color space can be mixed out. Figure 3 All color coordinate points in the closed triangular area shown. Figure 3The middle curve TC represents the blackbody radiation curve, which is used to represent the visual representation of the light source color temperature color diagram. The three primary colors of RGB are: primary color R (red-white light, based on the first light-emitting unit), primary color B (sky blue light, based on the second light-emitting unit), and primary color G (light green light, based on the third light-emitting unit). The first light-emitting unit is located in a quadrilateral area surrounded by four coordinate points (0.665, 0.308), (0.681, 0.318), (0.578, 0.415), (0.558, 0.386), the second light-emitting unit is located in a quadrilateral area surrounded by four coordinate points (0.15, 0.115), (0.165, 0.125), (0.177, 0.212), (0.15, 0.2), and the third light-emitting unit is located in a quadrilateral area surrounded by four coordinate points (0.372, 0.57), (0.42, 0.54), (0.375, 0.45), (0.33, 0.455). It can be seen that through the structural design of the circular light-emitting area 11, the first annular light-emitting area 120, and the second annular light-emitting area 121, and the mixing of the RGB three primary colors in a specific proportion, the point coordinates of the mixed color are moved along the trajectory of the black body radiation curve. In practice, the coordinate points of the three color temperatures corresponding to the circular light-emitting area 11, the first annular light-emitting area 120, and the second annular light-emitting area 121 are customized, and it is easy to achieve infinite color adjustment from low color temperature to high color temperature along the black body radiation curve, and achieve high-quality white light and dynamic spectrum with a wide color gamut. The overall mixed color light effect is very good. In other embodiments, the types and proportions of the primary colors R, B, and G can be adjusted according to actual needs to obtain different coordinate points on the CIE 1931 color space, thereby obtaining different mixed light effects.

[0033] Furthermore, the phosphors of the circular light-emitting area 11, the first annular light-emitting area 120, and the second annular light-emitting area 121 are cyan phosphors, yellow-green phosphors, and red phosphors, respectively. In a specific implementation, in the circular light-emitting area 11, the first annular light-emitting area 120, and the second annular light-emitting area 121, each area corresponds to the phosphors of the three primary colors of RGB. In this embodiment, cyan phosphors are set in the circular light-emitting area 11, corresponding to the primary color B (sky blue light); yellow-green phosphors are set in the first annular light-emitting area 120, corresponding to the primary color G (light green light); and red phosphors are set in the second annular light-emitting area 121, corresponding to the primary color R (red-white light). The peak wavelengths of the above three phosphors can be selected as required, and the overall mixed color light-emitting effect is good, the mixed white light has a wider color gamut, a high color rendering index, and better MR performance.

[0034] Furthermore, the peak wavelength of the yellow-green phosphor is in the range of 480nm to 495nm, the peak wavelength of the cyan phosphor is in the range of 530nm to 550nm, and the peak wavelength of the red phosphor is in the range of 625nm to 645nm. In a specific implementation, a cyan phosphor is set in the circular light-emitting area 11, and the peak wavelength of the selected cyan phosphor is within the range of 480nm to 495nm. The first annular light-emitting area 120 is set with a yellow-green phosphor, and the peak wavelength of the selected cyan phosphor is within the range of 530nm to 550nm. The second annular light-emitting area 121 is set with a red phosphor, and the peak wavelength of the selected red phosphor is within the range of 625nm to 645nm. The corresponding type of phosphor can take any value within the corresponding peak wavelength range to obtain a high-quality white light spectrum. The specific value of the peak wavelength can be determined according to the application requirements, specifically, the color coordinate values ​​can be selected in the CIE1931 color space, the primary color R coordinate point (0.5915, 0.3976), the primary color B coordinate point (0.3761, 0.4774), and the primary color G coordinate point (0.1603, 0.1870). The primary color R can be realized by using a 455nm peak wavelength blue light LED chip 20 to excite a 625nm peak wavelength red powder, the primary color B can be realized by using a 455nm peak wavelength blue light LED chip 20 to excite a 540nm peak wavelength cyan powder, and the primary color G can be realized by using a 455nm peak wavelength blue light LED chip 20 to excite a 482nm peak wavelength yellow-green powder, and a high-quality white light spectrum can be obtained as a whole.

[0035] The utility model also provides a lighting device, such as Figure 4 As shown, the lighting device includes a housing 40 and a COB light source 100 and other components. The COB light source 100 is arranged inside the housing 40 and serves as a light source of the lighting device as a whole, providing a basic light source for the lighting device. The COB light source 100 in this embodiment can adopt any COB light source 100 provided by the utility model. Since the specific structure and working principle of the COB light source 100 have been described in detail in the previous description, they will not be repeated here for the sake of brevity.

[0036] Further, refer to Figure 4The lighting device further includes a light mixing lens 50, which is disposed in the housing 40 and located above the COB light source 100. The side of the light mixing lens 50 facing the COB light source 100 is concavely formed to form a circular convex surface 510, and the side of the light mixing lens 50 away from the COB light source 100 is concavely formed to form a circular plane 511. A convex lens 51 is defined between the circular convex surface 510 and the circular plane 511, and the main optical axis of the convex lens 51 is coaxial with the circular light-emitting area 11 and the annular light-emitting area 12 of the COB light source 100. In a specific implementation, after the COB light source 100 emits light, the most original light emitted is a multi-color mixed light. In order to enhance the mixing effect of the light source, the present embodiment uses the light mixing lens 50 to distribute light. The light mixing lens 50 is transparent as a whole, and is disposed above the COB light source 100 in the housing 40, and is in the direct direction of the light source of the COB light source 100. The central area of ​​the mixing lens 50 facing the COB light source 100 is concavely formed with a circular convex surface 510, and the central area of ​​the side away from the COB light source 100 is concavely formed with a circular plane 511. The circular convex surface 510 and the circular plane 511 are separated by a certain thickness, so that a convex lens 51 with one side flat and the other side convex is formed between the two, and the main optical axis of the convex lens 51 is coaxial with the circular light-emitting area 11 and the annular light-emitting area 12 in the COB light source 100. The specific optical parameters of the convex lens 51 can be designed according to the needs of light distribution. When the COB light source 100 emits light, the generated light source irradiates along the main optical axis of the convex lens 51, and the light source is gathered under the focusing effect of the convex lens 51 and irradiates at the corresponding angle.

[0037] Furthermore, refer to Figure 4 , the ratio of the diameter of the circular plane 511 to the outer diameter of the annular light-emitting area 12 of the COB light source 100 is greater than 6. In a specific implementation, light is generated by the circular light-emitting area 11 of the COB light source 100 and the fluorescent powder in the annular light-emitting area 12 under the excitation of the LED chip 20, and the inner diameter of the annular light-emitting area 12 is greater than the diameter of the circular light-emitting area 11 and is located outside the circular light-emitting area 11, so the light-emitting range of the annular light-emitting area 12 is used as the light-emitting range. The circular plane 511 serves as the light-emitting side of the mixing lens 50, that is, the light source is emitted from the circular plane 511. When designing the circular plane 511, it is designed according to the ratio of the diameter of the circular plane 511 to the outer diameter of the annular light-emitting area 12 being greater than 6, that is, the diameter of the circular plane 511 is more than 6 times the outer diameter of the annular light-emitting area 12, so that the light mixing effect of the light emitted by the COB light source 100 can be effective and the quality of the light output is higher.

[0038] In one embodiment, referring to Figure 4, the circular convex surface 510 and the circular plane 511 are both convexly provided with compound eyes distributed in clusters (not shown in the figure). In a specific implementation, compound eyes distributed in clusters are convexly provided on the circular convex surface 510 and the circular plane 511 of the mixing lens 50, and the compound eyes distributed in clusters are specifically a structure formed by a plurality of raised particles evenly gathered together. The circular convex surface 510 and the circular plane 511 can also be designed as frosted surfaces to replace the compound eyes, so that both the circular convex surface 510 and the circular plane 511 have a certain granularity. The circular convex surface 510 is the light input side of the mixing lens 50, and the circular plane 511 is the light output side of the mixing lens 50. The compound eye structure distributed in clusters is convexly provided on both, which can effectively filter the light emitted by the COB light source 100 and improve the quality of the output light.

[0039] In one embodiment, referring to Figure 4 The lighting device further includes a diffusion film 60 for diffusing light, the diffusion film 60 is arranged in the housing 40 and covers the side of the light mixing lens 50 away from the COB light source 100, wherein the haze of the diffusion film 60 ranges from 10% to 90%. In a specific implementation, the diffusion film 60 is a sheet structure with a haze of 10% to 90% and a certain area, and the diffusion film 60 covers the side of the light mixing lens 50 away from the COB light source 100 as a whole, and is in the direct direction of the light source. Haze is also called turbidity, which refers to the percentage of transmitted light intensity that deviates from the direction of incident light due to light scattering when the transmitted light passes through a material. The larger the haze value of an object, the lower the transparency and clarity. In this embodiment, the haze of the diffusion film 60 is in the range of 10% to 90%. The light emitted by the COB light source 100 is diffused by the diffusion film 60 after passing through the mixing lens 50. The diffusion film 60 with a haze in the range of 10% to 90% can effectively reduce the intensity of the light source after passing through the mixing lens 50, making the light softer and suitable for lighting.

[0040] In one embodiment, referring to Figure 4 The lighting device further includes an anti-glare tube 70, one end of which is disposed on the side of the light-mixing lens 50 away from the COB light source 100, and the other end is exposed outside the housing 40. The aperture of the anti-glare tube 70 gradually expands from one end to the other end along its axial direction. In a specific implementation, the anti-glare tube 70 is a structure with two transparent ends, one end with a large aperture and the other end with a small aperture. The aperture of the anti-glare tube 70 gradually expands along its axial direction. The end with a small aperture abuts against the side of the light-mixing lens 50 away from the COB light source 100, and the end with a large aperture is exposed outside the housing 40. Light enters from the end with a small aperture of the anti-glare tube 70, is gathered after diffuse reflection on the inner wall of the anti-glare tube 70, and finally comes out from the end with a large aperture. Under the action of the anti-glare tube 70, the light coming out is more gathered, which can avoid the glare problem.

[0041] The lighting device provided by the embodiment of the present invention adopts the COB light source provided by the present invention, and the light effect of the mixed color light is optimized and improved, which can meet the lighting needs of more scenes and has a better application prospect.

[0042] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A COB light source, characterized in that: include: A substrate, on which a circular light-emitting area and an annular light-emitting area are provided, wherein the annular light-emitting area is concentric with the circular light-emitting area, and the inner diameter of the annular light-emitting area is larger than the diameter of the circular light-emitting area, and phosphors are provided in both the circular light-emitting area and the annular light-emitting area; LED chips are arranged in the circular light-emitting area and the annular light-emitting area to excite the fluorescent powder to emit light.

2. The COB light source according to claim 1, characterized in that: The annular light-emitting area includes a first annular light-emitting area and a second annular light-emitting area. The inner diameter of the first annular light-emitting area is larger than the diameter of the circular light-emitting area, and the inner diameter of the second annular light-emitting area is larger than the outer diameter of the first annular light-emitting area.

3. The COB light source according to claim 2, characterized in that: The phosphors in the circular light-emitting area, the first annular light-emitting area, and the second annular light-emitting area are cyan phosphor, yellow-green phosphor, and red phosphor, respectively.

4. The COB light source according to claim 3, characterized in that: The peak wavelength of the yellow-green phosphor is in the range of 480nm to 495nm, the peak wavelength of the cyan phosphor is in the range of 530nm to 550nm, and the peak wavelength of the red phosphor is in the range of 625nm to 645nm.

5. A lighting device, characterized in that: include: case; A COB light source is provided in the housing; Wherein, the COB light source is the COB light source described in any one of claims 1-4.

6. The lighting device according to claim 5, characterized in that: The lighting device also includes a mixing lens, which is arranged in the shell and located above the COB light source. The side of the mixing lens facing the COB light source is concave to form a circular convex surface, and the side of the mixing lens away from the COB light source is concave to form a circular plane. A convex lens is defined between the circular convex surface and the circular plane, and the main optical axis of the convex lens is coaxial with the circular light-emitting area and the annular light-emitting area of ​​the COB light source.

7. The lighting device according to claim 6, characterized in that: The ratio of the diameter of the circular plane to the outer diameter of the annular light-emitting area of ​​the COB light source is greater than 6.

8. The lighting device according to claim 6, characterized in that: The circular convex surface and the circular plane are both convexly provided with compound eyes distributed in clusters.

9. The lighting device according to claim 6, characterized in that: The lighting device further comprises a diffusion film for diffusing light, wherein the diffusion film is arranged in the housing and covers a side of the light mixing lens away from the COB light source, wherein the haze range of the diffusion film is 10% to 90%.

10. The lighting device according to claim 6, characterized in that: The lighting device also includes an anti-glare tube, one end of which is arranged on the side of the mixing lens away from the COB light source, and the other end is exposed outside the shell, and the diameter of the anti-glare tube gradually increases from one end to the other end along its axis.

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