Blue light proof lamp bead

Abstract

The utility model provides a kind of anti-blue light lamp bead, comprising: lens assembly;The lens assembly includes lens body, the light entrance surface of lens body and the light exit surface of lens body, the side towards the light exit surface in the lens body is provided with the light reflection layer for reflecting light distribution, the side close to the light entrance surface is provided with composite anti-blue light layer, the composite anti-blue light layer includes blue light reflection layer, wavelength conversion layer and light diffusion layer for homogenizing light sequentially arranged from bottom to top, the blue light reflection layer selectively reflects the specific waveband blue light emitted by LED chip, the wavelength conversion layer contains fluorescent material that can be excited by blue light in it;Support is arranged at the bottom of the lens assembly;Groove for accommodating LED chip is arranged in the support, the LED chip is connected with the support by metal wire, and fluorescent powder layer is further arranged in the groove to wrap the LED chip and the metal wire.

Description

Technical Field

[0001] This utility model relates to the field of LED packaging, and in particular to an anti-blue light LED bead. Background Technology

[0002] With the rapid development of LED lighting technology, blue LED chips are widely used in various lighting and display products due to their high luminous efficiency and stability.

[0003] However, the high-energy blue light emitted by LED chips (typically in the wavelength range of 400–500 nm) may cause potential damage to the human retina. In particular, long-term exposure to high blue light radiation may accelerate visual fatigue and affect physiological rhythms.

[0004] In existing technologies, current LED chips typically use surface coatings to filter blue light or convert some blue light through phosphors to reduce blue light hazards. However, these methods have the following problems: traditional coating layers usually only block blue light through absorption, resulting in a large amount of light energy being converted into heat energy, reducing luminous efficiency and accelerating material aging; phosphor coatings are usually directly applied to the chip surface, which is prone to thermal quenching, leading to a decrease in conversion efficiency and poor light uniformity; some reflective layers have simple structures that cannot accurately match the chip's emission wavelength, resulting in effective light loss; and the packaging structure has problems such as uneven light distribution and obvious glare, affecting the user experience. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a blue light blocking LED bead that can effectively solve the shortcomings of the prior art.

[0006] A blue light blocking LED bead, comprising: Lens assembly; The lens assembly includes a lens body, an incident light surface of the lens body, and an exit light surface of the lens body. A reflective layer for reflecting and distributing light is disposed on the side of the lens body facing the exit light surface. A composite blue light blocking layer is disposed on the side near the incident light surface. The composite blue light blocking layer includes a blue light reflecting layer, a wavelength conversion layer, and a light diffusion layer for uniform light, arranged sequentially from bottom to top. The blue light reflecting layer selectively reflects blue light of a specific wavelength emitted by the LED chip. The wavelength conversion layer contains a fluorescent material that can be excited by blue light. A bracket is installed at the bottom of the lens assembly; The bracket has a recess for accommodating an LED chip, which is connected to the bracket via a metal wire. A phosphor layer that encapsulates the LED chip and the metal wire is also provided in the recess.

[0007] Compared with existing technologies, the beneficial effects of this invention are as follows: The LED chip emits blue light of a specific wavelength. This blue light first penetrates the phosphor layer surrounding the LED chip. During this process, some blue light photons are absorbed by the phosphor, exciting the phosphor to emit photons of a longer wavelength, achieving the first wavelength conversion. Some blue light photons are not absorbed by the phosphor layer, or pass through the gaps between the phosphor particles and continue to the upper blue light reflective layer. The blue light reflective layer reflects the blue light photons that were not absorbed by the phosphor layer back towards the groove. These blue light photons reflected back by the blue light reflective layer have the opportunity to be absorbed by the phosphor particles again, thereby exciting the phosphor to emit light of the target color again, thus significantly reducing the absorption rate of the light. The waste of photons significantly improves fluorescence conversion efficiency and fundamentally reduces the direct leakage of original blue light, thus lowering the risk of blue light hazards. By setting up a wavelength conversion layer, a small portion of non-peak blue light with slightly longer or shorter wavelengths that penetrates the blue light reflection layer is absorbed by the blue light-excited fluorescent material in the wavelength conversion layer and converted into safer light with longer wavelengths. This improves the luminous efficiency and spectral quality of the light source, while making the wavelength conversion layer a second strong line of defense against blue light, greatly further reducing the possibility of harmful blue light escaping. The reflective layer inside the lens body achieves directional reflection and light distribution control of light. Combined with the light diffusion layer's uniform light distribution effect, it significantly improves the uniformity of light output and reduces glare.

[0008] Furthermore, the blue light reflective layer is a distributed Bragg reflective layer, and the blue light band reflected by the blue light reflective layer matches the peak value of the main wavelength of the LED chip.

[0009] Furthermore, red or amber phosphor particles are uniformly dispersed inside the wavelength conversion layer.

[0010] Furthermore, the reflective layer is close to the light-emitting surface, and the reflective layer is arranged in the form of a spherical or ellipsoidal surface.

[0011] Furthermore, the bracket is made of a material with light-reflecting properties, the sidewalls of the groove are inclined and the top of the groove forms a funnel-shaped opening, the sidewalls of the groove are connected to the bottom of the groove by an arc, and the composite blue light blocking layer covers the top of the groove.

[0012] Furthermore, an overflow groove is provided on the top of the bracket, and an overflow hole is provided at the bottom of the overflow groove. The overflow groove is connected to the groove through the overflow hole. The height of the overflow hole near the groove end is greater than or equal to the height of the phosphor layer, which is greater than the height of the metal wire.

[0013] Furthermore, a gel groove is provided at the top of the support, the gel groove is arranged around the overflow groove, and the diameter of the light-incident surface is between the outer diameter and the inner diameter of the gel groove.

[0014] Furthermore, the composite blue light blocking layer is disposed within the lens body and the blue light reflecting layer is close to the light incident surface.

[0015] Furthermore, the composite blue light blocking layer is disposed outside the lens body and the light diffusion layer is close to the light incident surface.

[0016] Furthermore, an annular notch for attaching the composite blue light blocking layer is provided on the top of the bracket. The annular notch is located on the side of the adhesive overflow groove facing the groove, and the depth of the annular notch is less than the depth of the adhesive overflow groove. Attached Figure Description

[0017] Figure 1 This is a schematic cross-sectional view of the overall structure of the anti-blue light LED bead in Embodiment 1 of this utility model; Figure 2 for Figure 1 A magnified schematic diagram of part A in the middle; Figure 3 This is a schematic cross-sectional view of the overall structure of the anti-blue light LED bead in Embodiment 2 of this utility model; Figure 4 for Figure 3 A magnified schematic diagram of part B in the middle; Explanation of key component symbols:

[0018] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Example 1 Please see Figures 1 to 2 The blue light blocking LED bead in Embodiment 1 of this utility model includes: Lens assembly; The lens assembly includes a lens body 10, a light-incident surface 11 of the lens body 10, and a light-exiting surface 12 of the lens body 10. A reflective layer 13 for reflecting and distributing light is disposed inside the lens body 10 on one side facing the light-exiting surface 12. A composite blue light blocking layer is disposed on one side near the light-incident surface 11. The composite blue light blocking layer includes a blue light reflecting layer 21, a wavelength conversion layer 22, and a light diffusion layer 23 for uniform light distribution, arranged sequentially from bottom to top. The blue light reflecting layer 21 selectively reflects blue light of a specific wavelength emitted by the LED chip. The wavelength conversion layer 22 contains a fluorescent material that can be excited by blue light. A bracket 30 is disposed at the bottom of the lens assembly; A groove 31 for accommodating an LED chip 40 is provided in the bracket 30. The LED chip 40 is connected to the bracket 30 via a metal wire 50. A phosphor layer 32 that wraps the LED chip 40 and the metal wire 50 is also provided in the groove 31.

[0023] Understandably, the LED chip 40 emits blue light of a specific wavelength. This blue light first penetrates the phosphor layer 32 surrounding the LED chip 40. During this process, some blue light photons are absorbed by the phosphor, exciting the phosphor to emit photons of a longer wavelength, achieving the first wavelength conversion. Some blue light photons are not absorbed by the phosphor layer, or pass through the gaps between the phosphor particles, and continue to be emitted towards the upper blue light reflective layer 21. The blue light reflective layer 21 reflects the blue light photons that were not absorbed by the phosphor layer 32 back towards the groove 31. These blue light photons reflected back by the blue light reflective layer 21 have the opportunity to be absorbed by the phosphor particles again, thereby exciting the phosphor to emit light of the target color again, thus significantly reducing light intensity. This significantly improves fluorescence conversion efficiency and fundamentally reduces the direct leakage of original blue light, thus lowering the risk of blue light hazards. By setting the wavelength conversion layer 22, a small portion of non-peak blue light with slightly longer or shorter wavelengths that penetrates the blue light reflection layer is absorbed by the blue light-excited fluorescent material in the wavelength conversion layer 22 and converted into safer light with longer wavelengths. This improves the luminous efficiency and spectral quality of the light source, while making the wavelength conversion layer 22 a second line of defense against blue light, greatly further reducing the possibility of harmful blue light escaping. The reflective layer 13 in the lens body 10 achieves directional reflection and light distribution control of light. Combined with the light diffusion layer's uniform light distribution effect, it significantly improves the uniformity of light output and reduces glare.

[0024] Furthermore, the blue light reflective layer 21 is a distributed Bragg reflective layer, and the blue light band reflected by the blue light reflective layer 21 matches the peak value of the main wavelength of the LED chip 40.

[0025] Understandably, the distributed Bragg reflector has high reflectivity and narrowband reflectivity. By setting the blue light reflector 21 as a distributed Bragg reflector, it can accurately match the peak wavelength of the LED chip 40, achieve efficient reflection of specific blue light bands, avoid light energy loss in ineffective bands, and overcome the problem that traditional broadband reflectors cannot accurately match the chip wavelength, resulting in loss of effective light.

[0026] Furthermore, red or amber phosphor particles are uniformly dispersed inside the wavelength conversion layer 22.

[0027] Understandably, by uniformly dispersing red or amber phosphor particles inside the wavelength conversion layer 22, the red or amber phosphor particles can be excited by blue light and emit long-wavelength light, effectively supplementing the red light component, improving the color rendering index, and further reducing the proportion of blue light, thus solving the problems of incomplete spectrum and poor color rendering after conversion by a single phosphor.

[0028] Furthermore, the reflective layer 13 is close to the light-emitting surface 12, and the reflective layer 13 is arranged in the form of a spherical or ellipsoidal surface.

[0029] Understandably, the reflective layer 13 with a spherical or ellipsoidal surface is more in line with the laws of optical reflection, enabling precise control and efficient light distribution, improving light output efficiency. Furthermore, by reducing the light output intensity at the top of the LED chip through the reflective layer 13, the light intensity at the top is reflected, thereby increasing the light output intensity at the side. This can reduce the distance between the LED chip and the film, and reduce the thickness of the display module using the LED chip.

[0030] Furthermore, the bracket 30 is made of a material with light-reflecting properties, the sidewall of the groove 31 is inclined and the top of the groove 31 forms a funnel-shaped opening, the sidewall of the groove 31 is connected to the bottom of the groove 31 by an arc, and the composite anti-blue light layer covers the top of the groove 31.

[0031] Furthermore, an overflow groove 33 is provided on the top of the bracket 30, and an overflow hole 34 is provided at the bottom of the overflow groove 33. The overflow groove 33 is connected to the groove 31 through the overflow hole 34. The height of the end of the overflow hole 34 near the groove 31 is greater than or equal to the height of the phosphor layer 32, which is greater than the height of the metal wire 50.

[0032] Understandably, by providing an overflow groove 33 at the top of the bracket 30, and an overflow hole 34 at the bottom of the overflow groove 33, with the overflow groove 33 connected to the groove 31 via the overflow hole 34, adhesive can overflow from the groove 31 into the overflow groove 33 through the overflow hole 34 during the dispensing process. Atmospheric pressure will cause the height of the adhesive in the groove 31 and the overflow groove 33 to be level, allowing the height of the adhesive to be observed through the overflow groove 33 and preventing overflow. By setting the height of the overflow hole 34 near the groove 31 to be greater than or equal to the height of the phosphor layer 32 and greater than the height of the metal wire 50, the dispensing process can be stopped when adhesive overflows from the groove 31 into the bottom of the overflow groove 33 through the overflow hole 34. The adhesive dispensing process facilitates worker assessment of the dispensing status, increasing work efficiency. By tilting the sidewalls of the groove 31 and creating a funnel-shaped opening at the top, the light-emitting angle of the LED chip 40 can be increased. The arc-shaped connection between the sidewalls and bottom of the groove 31 further increases the light reflection angle of the LED chip 40 towards the junction of the sidewalls and bottom of the groove 31, thereby increasing the spacing between LEDs in the display module and reducing the number of LEDs required. Using a material with light-reflecting properties for the bracket 30 increases the reflectivity of light emitted by the LED chip 40 towards the interior of the groove 31, thus increasing luminous intensity.

[0033] Furthermore, a gel groove 35 is provided on the top of the bracket 30, the gel groove 35 is arranged around the overflow groove 33, and the diameter of the light-incident surface 11 is between the outer diameter and the inner diameter of the gel groove 35.

[0034] It is understandable that by setting the gel groove 35, the mold of the lens body 10 can be placed in the gel groove 35, thereby increasing the stability and convenience of manufacturing the lens body 10.

[0035] Furthermore, the composite blue light blocking layer is disposed within the lens body 10 and the blue light reflecting layer 21 is close to the light incident surface 11.

[0036] Understandably, by placing the composite blue light blocking layer inside the lens body 10, the blue light reflecting layer 21 is prevented from being exposed to air for a long time, which would lead to moisture absorption and oxidation, resulting in a decrease in reflectivity. This greatly improves the reliability and lifespan of the product during long-term use. Furthermore, the composite blue light blocking layer is protected by the hard lens body 10 and will not be damaged or have its performance reduced by wiping, scratching, or dust contamination, ensuring that the optical interface remains clean. In addition, there is no need to add a precision step of attaching the blue light blocking film on the LED chip packaging production line, reducing production processes and time, and lowering the risk of yield loss due to additional process steps.

[0037] Example 2 Please see Figures 3-4 The image shown is an anti-blue light LED bead in Embodiment 2 of this utility model, which differs from the anti-blue light LED bead in Embodiment 1 in that: The composite blue light blocking layer is disposed outside the lens body 10 and the light diffusion layer 23 is close to the light incident surface 11.

[0038] An annular notch 36 for attaching the composite blue light blocking layer is provided on the top of the bracket 30. The annular notch 36 is located on the side of the overflow groove 33 facing the groove 31, and the depth of the annular notch 36 is less than the depth of the overflow groove 33.

[0039] Understandably, by placing the composite blue light blocking layer outside the lens body 10, a series of products with different blue light blocking levels and color temperatures can be quickly derived by using the same LED chip and bracket and replacing the blue light reflecting layer 21 with different specifications. Moreover, the blue light blocking effect can be flexibly configured according to customer order requirements, realizing large-scale customized production and greatly reducing R&D costs and inventory pressure. Furthermore, during the LED packaging process, high temperatures are generated in dispensing, curing, and other stages. If the wavelength conversion layer 22 containing organic adhesives and phosphors is built into the lens, it needs to withstand these high temperatures. The external mounting solution allows the composite blue light blocking layer to completely avoid the high-temperature stages in the packaging process, preventing high temperatures from causing phosphor efficiency to decrease or optical adhesives to yellow, thereby better maintaining its initial performance.

[0040] In summary, the blue light blocking LED bead in the above embodiments of this utility model works as follows: the LED chip emits blue light of a specific wavelength. This blue light first penetrates the phosphor layer surrounding the LED chip. During this process, some blue light photons are absorbed by the phosphor, exciting the phosphor to emit photons of a longer wavelength, achieving the first wavelength conversion. Some blue light photons are not absorbed by the phosphor layer, or pass through the gaps between the phosphor particles and continue to the upper blue light reflecting layer. The blue light reflecting layer reflects the blue light photons that were not absorbed by the phosphor layer back towards the groove. These blue light photons reflected back by the blue light reflecting layer have the opportunity to be absorbed by the phosphor particles again, thereby exciting the phosphor to emit light of the target color again, thus significantly reducing the blue light emission. This design eliminates photon waste, significantly improves fluorescence conversion efficiency, and fundamentally reduces the direct leakage of original blue light, thus lowering the risk of blue light hazard. By setting a wavelength conversion layer, a small portion of non-peak blue light with slightly longer or shorter wavelengths that penetrates the blue light reflection layer is absorbed by the blue light-excited fluorescent material in the wavelength conversion layer and converted into safer light with longer wavelengths. This improves the luminous efficiency and spectral quality of the light source, while also making the wavelength conversion layer a second, robust line of defense against blue light, greatly further reducing the possibility of harmful blue light escaping. The reflective layer inside the lens body enables directional reflection and light distribution control of light. Combined with the light diffusion layer's uniform light distribution, this significantly improves the uniformity of light output and reduces glare.

[0041] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or particular described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or particulars described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A blue light blocking LED bead, characterized in that, include: Lens assembly; The lens assembly includes a lens body, a light-incident surface of the lens body, and a light-exiting surface of the lens body. A reflective layer for reflecting and distributing light is disposed on the side of the lens body facing the light-exiting surface. A composite blue light blocking layer is disposed on the side near the light-incident surface. The composite blue light blocking layer includes a blue light reflecting layer, a wavelength conversion layer, and a light diffusion layer for uniform light, arranged sequentially from bottom to top. The blue light reflecting layer selectively reflects blue light emitted by the LED chip, and the wavelength conversion layer contains a fluorescent material that can be excited by blue light. A bracket is installed at the bottom of the lens assembly; The bracket has a recess for accommodating an LED chip, which is connected to the bracket via a metal wire. A phosphor layer that encapsulates the LED chip and the metal wire is also provided in the recess.

2. The blue light blocking LED bead according to claim 1, characterized in that, The blue light reflective layer is a distributed Bragg reflective layer, and the blue light band reflected by the blue light reflective layer matches the peak value of the main wavelength of the LED chip.

3. The blue light blocking LED bead according to claim 1, characterized in that, The wavelength conversion layer contains uniformly dispersed red or amber phosphor particles.

4. The blue light blocking LED bead according to claim 1, characterized in that, The reflective layer is close to the light-emitting surface, and the reflective layer is arranged in the form of a spherical or ellipsoidal surface.

5. The blue light blocking LED bead according to claim 1, characterized in that, The bracket is made of a material that reflects light. The sidewalls of the groove are inclined, forming a funnel-shaped opening at the top of the groove. The sidewalls of the groove are connected to the bottom of the groove by an arc. The composite blue light blocking layer covers the top of the groove.

6. The blue light blocking LED bead according to claim 1, characterized in that, An overflow groove is provided on the top of the bracket, and an overflow hole is provided at the bottom of the overflow groove. The overflow groove is connected to the groove through the overflow hole. The height of the overflow hole near the groove is greater than or equal to the height of the phosphor layer, which is greater than the height of the metal wire.

7. The blue light blocking LED bead according to claim 6, characterized in that, A gel groove is also provided at the top of the bracket, the gel groove is arranged around the overflow groove, and the diameter of the light-incident surface is between the outer diameter and the inner diameter of the gel groove.

8. The blue light blocking LED bead according to claim 1, characterized in that, The composite blue light blocking layer is disposed within the lens body and the blue light reflecting layer is close to the light incident surface.

9. The anti-blue light LED bead according to claim 1, characterized in that, The composite blue light blocking layer is disposed outside the lens body and the light diffusion layer is close to the light incident surface.

10. The anti-blue light LED bead according to claim 7, characterized in that, An annular notch for attaching the composite blue light blocking layer is provided on the top of the bracket. The annular notch is located on the side of the adhesive overflow groove facing the groove, and the depth of the annular notch is less than the depth of the adhesive overflow groove.

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