LED lamp bead ball head, lamp bead and lamp

Abstract

The invention discloses an LED lamp bead ball head, a lamp bead and a lamp, belonging to the technical field of LED lighting devices, and provides an empirical formula of the ball head area A and the light-emitting angle. By matching the light-emitting angle of the LED chip and the curvature radius of the lamp bead ball head, the maximized effective area of ​​the ball head can be obtained. The increase in the effective area can collect more light, and at the same time, considering the influence of different wavelengths, the optimal curvature radius parameters under each wavelength are given through a fitting formula, thereby improving the photoelectric conversion efficiency, providing theoretical guidance for the design of the LED lamp bead ball head, making the lamp bead ball head design more accurate; providing a fitting formula of the ball head area A and the light effect P; and improving the light effect of the LED lamp bead. The invention solves the problem of low light efficiency of the LED lamp bead ball head designed based on experience in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of LED lighting devices, and more specifically to an LED lamp bead ball head, a lamp bead and a lamp. Background Art

[0002] LED is widely used in various lighting products due to its advantages such as high efficiency, long life and environmental protection. LED lamp ball head is a key component of LED lighting products, and its light efficiency and lighting effect directly affect the performance of the entire product. At present, improving the light efficiency and lighting performance of LED lamp ball head is the direction that technicians in this field are constantly exploring.

[0003] The existing LED ball heads are mainly spherically symmetrical structures, which have low space utilization and are difficult to achieve high light efficiency. In addition, the luminous angle of the spherically symmetrical LED ball head is basically the same in all directions, which also reduces the utilization of light. Some manufacturers use non-spherical LED ball heads, which can control the luminous angle to a certain extent and improve the light efficiency.

[0004] The Chinese patent application, application number CN111834512A, published on October 27, 2020, discloses a high-efficiency LED lamp bead with a spherical structure, including a packaging bracket and a spherical light-transmitting body. A reflective bowl is provided in the center of the packaging bracket. The reflective bowl is a cone-shaped structure with a small bottom and a large opening. The bottom end of the packaging bracket is fixedly connected to a lamp bead driving board. A light-emitting wick is welded and fixed on the upper part of the lamp bead driving board. The light-emitting wick is located at the center of the bottom end of the reflective bowl. The inner cavity of the reflective bowl is filled with packaging silicone, which covers the light-emitting wick. The top surface of the packaging silicone is flush with the top surface of the packaging bracket and is etched with an etched rough surface. However, the scheme only provides that the spherical height of the spherical light-transmitting body is between 0.1 and 0.2 times its maximum cross-sectional diameter, and does not provide a technical solution to match the light-emitting angle and the radius of curvature of the ball head to provide light efficiency. Summary of the invention

[0005] 1. Technical problems to be solved

[0006] In view of the problem of low lighting efficiency of LED lamp bead ball heads in the prior art, the present invention provides an LED lamp bead ball head, a lamp bead and a lamp, which can obtain a maximized effective area of ​​the ball head by matching the light-emitting angle of the LED chip and the curvature radius of the lamp bead ball head, and then improve the photoelectric conversion efficiency by fitting the effective area of ​​the ball head and the wavelength of the light wave, thereby improving the lighting efficiency of the LED lamp bead.

[0007] 2. Technical solution

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] An LED lamp bead ball head, comprising:

[0010] The photoelectric conversion efficiency is calculated by the following formula:

[0011] P=∫A∫λI(λ)dλdA

[0012] Among them, P represents the photoelectric conversion efficiency of the lamp bead, A represents the area of ​​the ball head, λ represents the wavelength, and I(λ) represents the light intensity; the luminous area and the wavelength of the light wave are important parameters for calculating the photoelectric conversion efficiency. The transmission difference of light of different wavelengths (colors) emitted by the LED chip in the ball head is different, so the influence of wavelength needs to be considered, which can make the blue light, green light and red light get the best directional transmission in the ball head and obtain the best chromaticity and mixed light effect.

[0013] A is calculated by the following formula:

[0014]

[0015] Where r is the radius, Indicates the luminous angle. The luminous angle of the LED chip and the curvature radius of the lamp bead ball head are matched to maximize the effective area of ​​the ball head. The increase in effective area can collect more light and improve the photoelectric conversion efficiency.

[0016] Furthermore, the luminous angle The value range is 120° to 170°. Too small a light-emitting angle is not conducive to color mixing and diffuse reflection of light, and cannot provide a uniform light environment; too small a light-emitting angle (less than 120°) will lead to greater light loss, reduce the effective amount of light and reduce conversion efficiency. This is because a large light-emitting angle means that more light is directly irradiated in useless directions, and according to the Lambertian distribution, the light intensity at a large light-emitting angle is smaller. In addition, a large light-emitting angle will also produce more serious total reflection losses.

[0017] Furthermore, the LED lamp bead ball head is an ellipsoidal ball head, and the LED lamp bead ball head includes: an LED chip. For LEDs with a large light-emitting angle, the light in the hemispherical ball head is prone to multiple reflections and loss. In this case, a non-spherical ball head such as an ellipsoidal ball head can be selected. The curvature radius is different in the horizontal and vertical directions, which can reduce total reflection and increase light transmittance.

[0018] Furthermore, the main curvature radius of the ellipsoid ranges from 1.5mm to 1.75mm. The main curvature radius of the ellipsoidal ball head matches the horizontal luminous angle, and the secondary curvature radius matches the vertical luminous angle, which can obtain the best collection effect and the most accurate output in different directions, reducing or avoiding refraction loss. A larger main curvature radius can collect wide-angle horizontal light, and a smaller secondary curvature radius can reduce the refraction loss of horizontal external light. This can better match the wide-angle light emission of the LED.

[0019] Furthermore, the ball head is made of high-transmittance silicone material. The wavelength conversion efficiency of LED depends on the bandgap width and luminescence mechanism of the chip material. The photon matching degree of different materials and different wavelengths determines its conversion efficiency. For example, GaN material has a wide luminous range and high conversion efficiency, while GaP is lower. PN junction luminescence also requires that the photon energy matches the bandgap width, otherwise it will be lost as heat, reducing the conversion efficiency.

[0020] Furthermore, the refractive index of the optical ball head material to light ranges from 1.3 to 1.5. The refractive index of the optical ball head material is between that of the LED chip and air, which can increase the critical angle of total reflection, reduce total reflection loss, and improve transmittance and utilization.

[0021] An LED lamp bead comprises the above-mentioned LED lamp bead ball head.

[0022] Furthermore, the LED lamp bead also includes a bracket and a connecting part; the bracket is used to install the LED chip; the connecting part is used to fix the distance between the LED chip and the lamp bead ball head.

[0023] Furthermore, the connecting part is a cylinder, and the cylinder and the lamp bead ball head have the same axis and are tangent in space. The influence of the connecting part on the transmission and emission of light in the lamp bead ball head can be minimized. Due to the tangent in space, the connecting part will not block the incident or outgoing light of the lamp bead ball head, and will not produce additional light loss or shadow effect, which can ensure that the light in the lamp bead ball head is used to the maximum extent. The spatial tangent connection method does not require complex positioning and alignment mechanisms, and it is easier to achieve machine automated connection and welding, which is conducive to standardized design and mass production of products and reduces costs.

[0024] An LED lamp includes the above-mentioned LED lamp bead, which obtains a maximized effective area of ​​the ball head by matching the light-emitting angle of the LED chip and the curvature radius of the ball head of the lamp bead, and then improves the photoelectric conversion efficiency by fitting the effective area of ​​the ball head and the wavelength of the light wave, thereby improving the luminous efficacy of the LED lamp.

[0025] 3. Beneficial effects

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] An empirical formula for the ball head area A and the luminous angle is given. The maximum effective area of ​​the ball head is obtained by matching the luminous angle of the LED chip and the curvature radius of the lamp bead ball head. The increase in the effective area can collect more light. At the same time, considering the influence of different wavelengths, the optimal curvature radius parameters at each wavelength are given through a fitting formula, thereby improving the photoelectric conversion efficiency. This provides theoretical guidance for the design of LED lamp bead ball heads, making the design of lamp bead ball heads more accurate; a fitting formula for the ball head area A and the light effect P is given; and the refractive index range of the ball head material is given, further improving the utilization of light. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of an LED lamp bead of the present invention;

[0029] Figure 2 It is a schematic diagram of a hemispherical ball head of the present invention;

[0030] Figure 3 It is a schematic diagram of the ellipsoidal ball head of the present invention.

[0031] Description of the numbers in the figure:

[0032] 1. LED lamp bead; 2. Lens; 3. Connecting part; 4. Bracket. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Glossary:

[0035] LED light: It is a lighting device that uses LED (Light Emitting Diode) as a light source. The working principle of LED light is to activate the LED chip through direct current, generate electrons and holes in the semiconductor material, release energy in the recombination process, and emit visible light. The material and structure of the LED chip determine the color and brightness of its light. Common LED lights include monochrome LED lights, multi-color LED lights and white light LED lights.

[0036] LED lamp beads: LED lamp beads refer to light-emitting devices composed of LED chips, packaging glue and packaging bodies. LED lamp beads use semiconductor light sources and are packaged from light-emitting diode chips, which can be used directly for lighting. They are usually composed of a blue light chip and a phosphor to emit white light.

[0037] Lamp bead ball head: The lamp bead ball head refers to the top part of the lamp bead assembled on the lamp, which is usually a round or spherical structure. The lamp bead ball head is designed to protect the lamp bead and provide proper heat dissipation. The lamp bead ball head can protect the lamp bead, prevent dust, water vapor and other external substances from entering the lamp bead, and reduce the risk of damage to the lamp bead. It can prevent the lamp bead from being exposed to the external environment and extend the service life of the lamp bead. LED lamp beads will generate a certain amount of heat when working, and the lamp bead ball head usually uses heat dissipation materials or heat dissipation structures to help dissipate heat. It can quickly conduct the heat generated by the lamp bead to the surrounding environment through the thermal conductivity of the heat dissipation material, maintain the normal operating temperature of the lamp bead, and prevent overheating damage. The lamp bead ball head usually has an appropriate optical design, which can adjust the emission direction and angle of light so that the light can better illuminate the target area. It can change the light scattering and focusing characteristics of the lamp bead to provide better lighting and visual effects.

[0038] Bracket: LED lamp bead bracket can provide a stable fixing point to fix the LED chip and encapsulation glue in the right position. It can ensure the alignment and connection between the LED chip and the encapsulation glue, and maintain the stability and consistency of the lamp bead. LED lamp bead brackets usually have a heat dissipation guide design to help heat be exported from the LED chip. Through appropriate heat dissipation design, the heat dissipation effect of LED lamp beads can be improved, the temperature can be reduced, and the service life of LEDs can be extended. LED lamp bead brackets usually have metal sheets or metal wires for electrical connections. It can provide the function of current transmission and connection of LED chips, ensure the normal supply of current, and keep the normal operation of LEDs.

[0039] Connector: The connecting part between the ball head and the bracket in the LED lamp bead. This connecting part is used to connect the ball head of the lamp bead and the bracket together to ensure the stability and electrical connection of the lamp bead. The connecting part usually has an electrical connection: The connecting part provides an electrical connection to connect the circuit between the ball head of the lamp bead and the bracket. It usually includes metal contacts or pins for transmitting current and signals to ensure the normal operation of the LED lamp bead. The connecting part has the function of firm fixing to ensure that the connection between the ball head of the lamp bead and the bracket is firm. It can use threads, buckles or other fixing mechanisms to enable the connecting parts to be firmly fixed together and not easy to loosen.

[0040] Photoelectric conversion efficiency: In LED lamps, photoelectric conversion efficiency refers to the efficiency of LED devices in converting electrical energy into light energy. Photoelectric conversion efficiency can be calculated by the following formula: Photoelectric conversion efficiency = (output light power / input electrical power) * 100%, where output light power refers to the power of the light energy emitted by the LED device, and input electrical power refers to the power of the electrical energy consumed by the LED device.

[0041] Ball head area: refers to the surface area of ​​the spherical part of the LED lamp bead. LED lamp beads are usually wrapped with a spherical transparent or translucent shell that wraps the LED chip. The size of the ball head area depends on the size and shape of the LED lamp bead. The ball head area of ​​the LED lamp bead affects its optical performance and heat dissipation performance. A larger ball head area can provide a wider angle of light emission, so that the light is more evenly distributed in the surrounding space. A smaller ball head area can provide a more concentrated beam, which is suitable for scenes that require directional lighting. In addition, a larger ball head area can also provide a larger surface area for heat dissipation, which helps the heat dissipation effect of the LED lamp bead.

[0042] Beam angle: In LED lights, the beam angle refers to the angle range of light emitted from the LED lamp bead. It describes the degree of widening or focusing of the LED lamp's light beam. The beam angle of LED lights can be determined by measuring the beam widening angle or focusing angle of the light. The beam widening angle refers to the range of light dispersion after the light is emitted from the LED lamp bead; the focusing angle refers to the range of light concentration after the light is emitted from the LED lamp bead. The beam angle has an important impact on the lighting effect and application of LED lights. A larger beam angle means that the LED lamp can widely illuminate the surrounding space and provide uniform lighting effects, which is suitable for scenes that require a larger range of lighting, such as indoor lighting. A smaller beam angle means that the LED lamp can provide a more concentrated beam, which is suitable for scenes that require directional lighting, such as outdoor landscape lighting or stage lighting.

[0043] Ellipsoidal ball head: A spherical shell of an LED lamp bead, which is shaped like an ellipsoid. The ellipsoidal ball head can provide a larger surface area, allowing the light to be more evenly distributed into the surrounding space, providing a softer lighting effect. Secondly, the ellipsoidal ball head can also provide a larger space for heat dissipation, effectively reducing the temperature of the LED lamp bead and increasing the life and stability of the LED. The design of the ellipsoidal ball head can also make the light distribution more uniform and have a larger light-emitting angle.

[0044] Principal curvature radius: The principal curvature radius of an ellipsoidal ball head refers to the radius of the principal curvature on the spherical surface of an ellipsoidal ball head. The principal curvature is an indicator that describes the degree of curvature of a surface at a certain point, and the principal curvature radius indicates the magnitude of the curvature. The principal curvature radius of an ellipsoidal ball head determines the curvature and shape of the ball head. A smaller principal curvature radius means that the curvature of the ball head is greater and the spherical surface is steeper. A larger principal curvature radius means that the curvature of the ball head is less and the spherical surface is flatter. The size of the principal curvature radius affects the propagation and output of light inside the ball head. A smaller principal curvature radius can make it easier for light to be refracted and focused by the ball head, which is suitable for scenes that require directional lighting. A larger principal curvature radius can make it easier for light to be scattered and broadened by the ball head, which is suitable for scenes that require a larger range of lighting.

[0045] High light transmittance silicone material: High light transmittance silicone material is a silicone material with excellent light transmittance, mainly used as the encapsulation material of the ball head part of LED lamp beads. It is made by adding transparent transmittance enhancers to silicone or using special formulas and processes to provide high transmittance characteristics. The transmittance of high light transmittance silicone material is usually above 90%, which can maximize the transmission of light, reduce light loss, and provide high brightness and uniform light output. High light transmittance silicone material has good heat resistance and weather resistance, and can maintain the stability of its light transmittance and physical properties under high temperature and harsh environment. High light transmittance silicone material has a low refractive index and scattering rate, which can effectively control the propagation and diffraction of light and provide clear and uniform light output. High light transmittance silicone material has good plasticity and processability, and can flexibly prepare ball heads in different shapes and sizes to meet the design requirements of different LED lamp beads.

[0046] Example 1

[0047] The purpose of the present invention is achieved through the following technical solutions.

[0048] The luminous area and wavelength of the light wave are important parameters for calculating the photoelectric conversion efficiency. The transmission difference of light of different wavelengths (colors) emitted by the LED chip in the ball head is different, so the influence of wavelength needs to be considered, which can make the blue light, green light and red light get the best directional transmission in the ball head and obtain the best chromaticity and mixed light effect. The luminous angle of the LED chip and the curvature radius of the ball head of the lamp bead are matched to obtain the maximum effective area of ​​the ball head. The increase of effective area can collect more light and improve the photoelectric conversion efficiency.

[0049] When the luminous angle is large, a larger principal radius of curvature is required to effectively collect light and achieve accurate output, otherwise a large light loss will occur. However, an increase in the principal radius of curvature will also lead to an increase in the volume and weight of the ball head, and an increase in cost, which is contrary to small and lightweight products. The area of ​​the ball head affects the photoelectric conversion efficiency, so the photoelectric conversion efficiency changes with the principal radius of curvature and the luminous angle. When the two are best matched, the photoelectric conversion efficiency reaches the maximum value. Therefore, the relationship curve and calculation formula between the luminous angle, principal radius of curvature and photoelectric conversion efficiency can be obtained through fitting experiments.

[0050] For LEDs with a large emitting angle, the light in the hemispherical ball head is prone to multiple total reflections and losses. In this case, a non-spherical ball head such as an ellipsoidal ball head can be selected. Its curvature radius is different in the horizontal and vertical directions, which can reduce total reflection and improve utilization. The main curvature radius of the ellipsoidal ball head matches the horizontal emitting angle, and the secondary curvature radius matches the vertical emitting angle. The best collection effect and the most accurate output can be obtained in different directions, reducing or avoiding refraction losses. A larger main curvature radius can collect wide-angle horizontal light, and a smaller secondary curvature radius can reduce the refraction loss of horizontal external light. This can better match the wide-angle emission of LEDs. Too small an emitting angle is not conducive to the mixing and diffuse reflection of light, and cannot provide a uniform light environment; too large an emitting angle (more than 120°) will lead to greater light loss, reduce the effective light volume and reduce the conversion efficiency. This is because a large emitting angle means that more light is directly irradiated in useless directions, and according to the Lambertian distribution, the light intensity at a large emitting angle is smaller. In addition, a large emitting angle will also produce more serious total reflection losses.

[0051] The wavelength conversion efficiency of LED depends on the bandgap width of the chip material and the luminescence mechanism. The photon matching degree of different materials and different wavelengths determines its conversion efficiency. For example, GaN material has a wide luminescence range and high conversion efficiency, while GaP is lower. PN junction luminescence also requires that the photon energy matches the bandgap width, otherwise it will be lost as heat, reducing the conversion efficiency. The specific technical solution is as follows:

[0052] Figure 1 Schematic diagram of the LED lamp bead of the present invention, as shown in Figure 1 As shown, the LED lamp bead 1 of the present invention includes: a lens 2, a connecting part 3 and a bracket 4. Among them, the lens 2 is made of a high refractive index material such as high-transmittance silicone. By selecting different refractive indices, the luminous angle in different directions can be controlled to reduce light loss. The bracket 4 is used to install the LED chip and provide circuit connection so that the light emitted by the LED chip is accurately incident into the lens 2 to avoid full-shot loss of light. The connecting part 3 is used to fix the distance between the lens 2 and the LED chip. The connecting part 3 is coaxially arranged with the lens 2. The connecting part is preferably a cylindrical structure. The connecting part and the lens 2 are tangent in space so that the connecting part 3 and the lens 2 can achieve a smooth transition of geometric shapes for easy installation. The cylinder has the same axis as the lamp bead ball head and is tangent in space. The influence of the connecting part on the transmission and emission of light in the lamp bead ball head can be minimized. Due to the tangent space, the connecting part will not block the incident or emitted light of the lamp bead ball head, and will not produce additional light loss or shadow effect, which can ensure that the light in the lamp bead ball head is maximized. The spatial tangent connection method does not require complex positioning and alignment mechanisms, and is easier to achieve machine automated connection and welding, which is conducive to standardized product design and mass production and reduces costs.

[0053] Figure 2Schematic diagram of the hemispherical ball head of the present invention, as shown in Figure 2 As shown, when the lens 2 is a hemispherical ball head, the light emitted by the LED chip has a light intensity according to the Lambertian distribution, and the light intensity is a cosine function of the light-emitting angle. The larger the light-emitting angle, the smaller the amount of light in the same solid angle. The light emitted by the LED chip will suffer total reflection loss after being refracted into the air. When the light-emitting angle exceeds the critical angle of the LED chip refractive index of 1, a large total reflection loss will be generated. A larger light-emitting angle exceeding 120° causes a large portion of the light emitted by the LED chip to directly irradiate the LED packaging structure or in useless directions, resulting in the loss of this part of the light energy. This results in a reduction in the amount of effective light and a reduction in the electro-optical conversion efficiency. A light-emitting angle exceeding 120° will result in a large light loss and reduce the conversion efficiency. A smaller light-emitting angle is not conducive to obtaining a larger illumination area and improving PPE.

[0054] Figure 3 Schematic diagram of the ellipsoidal ball head of the present invention, as shown in Figure 3 As shown, lens 2 is an ellipsoidal ball head. With an ellipsoidal ball head, the luminous angle and curvature radius in different directions can be adjusted, and light loss can be reduced while taking into account light color mixing, achieving high light efficiency and uniform lighting. The principal curvature radius of the ellipsoid ranges from 1.5mm to 1.75mm, where the principal curvature refers to the two principal curvatures in the normal direction of the surface at any point on the surface. They are the maximum and minimum curvatures on the surface, and the principal curvature describes the degree and direction of the curvature of the surface at that point. The material of lens 2 is a high-transmittance silicone material, and the refractive index of the high-transmittance silicone material ranges from 1.3 to 1.5.

[0055] Specifically, taking λ as 660nm peak band light as an example, the maximum light-emitting angle of the chip is 150° and 160°; the bracket size is 3030 (3mm*3mm) and 3535 (3.5mm*3.5mm); the chip size is 70mil, 65mil, 60mil, and 55mil (square size, the above sizes are side length sizes); simulate the optimal ball head design data, H is the cylinder height, r is the ball head radius (the cylinder radius is the same as the ball head radius).

[0056] The simulation data is shown in Table 1. The above simulation parameters are normalized and the empirical formula is extracted to obtain the photoelectric conversion efficiency calculation formula and the ball head area calculation formula as follows:

[0057] The ball head area A is calculated by the following formula:

[0058]

[0059] Where r is the radius, Indicates the luminous angle. The ball head is a non-spherical structure ball head.

[0060] The photoelectric conversion efficiency is calculated by the following formula:

[0061] P=∫A∫λI(λ)dλdA

[0062] Among them, P represents the photoelectric conversion efficiency of the lamp bead, A represents the area of ​​the ball head, λ represents the wavelength, and I(λ) represents the light intensity;

[0063] Table 1 Simulation data

[0064]

[0065]

[0066] Taking an LED lamp bead as an example, the LED lamp bead includes the above-mentioned LED lamp bead ball head, wherein λ is the 660nm peak band light as an example, the luminous angle of the LED lamp bead generated according to the empirical formula, it can be concluded that the PPE before improvement is 3.96umol / J, and the PPE of the LED lamp bead ball head produced according to the empirical formula is 4.28umol / J, which increases the PPE by 8%. The highest luminous efficiency of the improved LED lamp bead ball head reaches 4.46umol / J, and the highest luminous efficiency of the single bin reaches 4.53umol / J, which are 4.2% and 1.8% higher than those of OSRAM respectively, that is, the luminous efficiency of the improved LED lamp bead ball head exceeds the international level.

[0067] An LED lamp includes the above-mentioned LED lamp bead, which obtains a maximized effective area of ​​the ball head by matching the light-emitting angle of the LED chip and the curvature radius of the ball head of the lamp bead, and then improves the photoelectric conversion efficiency by fitting the effective area of ​​the ball head and the wavelength of the light wave, thereby improving the luminous efficacy of the LED lamp.

[0068] Through parameter fitting, the empirical formula of photoelectric conversion efficiency PPE and ball head area A was obtained, which provides theoretical guidance for the design of LED lamp bead ball heads, making the design process more accurate and systematic, and the effect more controllable. The ellipsoidal ball head structure and its main curvature radius and luminous angle range are adopted to achieve higher space utilization and light efficiency. The improved PPE and the single maximum light efficiency value both exceed the existing products and the international advanced level.

[0069] The above schematically describes the invention and its implementation methods, which is not restrictive. Without departing from the spirit or basic features of the invention, the invention can be implemented in other specific forms. What is shown in the accompanying drawings is only one of the implementation methods of the invention. The actual structure is not limited to this, and any figure mark in the claims should not limit the claims involved. Therefore, if a person of ordinary skill in the art is inspired by it, without departing from the purpose of the invention, a structural method and an embodiment similar to the technical solution are designed without creativity, which should all fall within the scope of protection of this patent. In addition, the word "including" does not exclude other elements or steps, and the word "one" before the element does not exclude the inclusion of "multiple" elements. The multiple elements stated in the product claim can also be implemented by one element through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any specific order.

Claims

1. An LED lamp bead head, characterized in that: The photoelectric conversion efficiency is calculated by the following formula: P=∫A∫λI(λ)dλdA Wherein, P represents the photoelectric conversion efficiency of the lamp bead, A represents the area of ​​the ball head, λ represents the wavelength, and I(λ) represents the light intensity; A is calculated by the following formula: Where r is the radius, Indicates the luminous angle; The light emitting angle The value range of is 120° to 170°; The LED lamp bead ball head is an ellipsoidal ball head, and the LED lamp bead ball head includes an LED chip; The main curvature radius of the ellipsoidal ball head ranges from 1.5 mm to 1.75 mm.

2. The LED lamp bead head according to claim 1, characterized in that: The material of the ellipsoidal ball head is a highly light-transmitting silicone material.

3. The LED lamp bead head according to claim 2, characterized in that: The refractive index of the optically highly transparent silicone material to light ranges from 1.3 to 1.

5.

4. An LED lamp bead, characterized in that: It comprises the lamp bead ball head as described in any one of claims 1 to 3.

5. The LED lamp bead according to claim 4, characterized in that: The LED lamp bead also includes a bracket and a connecting part; The bracket is used to install the LED chip; The connecting part is used to fix the distance between the LED chip and the lamp bead ball head.

6. The LED lamp bead according to claim 5, characterized in that: The connecting part is a cylinder, and the cylinder and the lamp bead ball head have the same axis and are tangent in space.

7. An LED lamp, characterized in that: The LED lamp comprises the lamp bead described in claim 6.

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