A diffuse light type SMD LED lamp bead

Abstract

The present invention discloses a diffuse light type patch LED lamp bead, belonging to the technical field of semiconductor electrical components. The diffuse light type patch LED lamp bead comprises a heat sink, a light emitting part and a lens. A packaging shell is provided at the surface of the heat sink where the light emitting part is installed. A resin block is provided at the light source of the light emitting part corresponding to the heat sink. The packaging shell comprises a shell. A stepped hole with a vertical axis is provided at the middle of the shell. The lens is embedded and installed in the stepped hole. Washers 1 and 2 are symmetrically provided at the edges of the horizontal end faces of the lens. The lens and the cover plate are stacked just above the light source of the light emitting part. Silicone oil is filled between the resin block and the lens, and between the cover plate and the lens to form a transition layer with a medium refractive index, so as to avoid the effect of serious total reflection caused by excessive refractive index difference at the junction, so that the light generated by the light emitting part can be fully transmitted and diverged, so as to avoid excessive brightness loss and prevent excessive light from being confined in the lamp bead and causing high operating temperature.

Description

Technical Field

[0001] The invention belongs to the technical field of semiconductor electrical components, and in particular relates to a scattered light type SMD LED lamp bead. Background Art

[0002] Astigmatism type SMD LED lamp beads are a type of surface mount LED lamp beads. Astigmatism type SMD LED lamp beads do not have traditional needle-shaped pins, but use sheet pins. With surface mounting technology, they can be directly mounted on circuit boards. Their characteristics are that the light-emitting angle is large, usually exceeding 120 degrees, so that the emitted light can be more evenly distributed.

[0003] In order to achieve the astigmatism effect, existing astigmatism-type SMD LED lamp beads will install astigmatism lenses on the path of the light-emitting chip to scatter and refract the light emitted by the light source to achieve a larger light-emitting angle;

[0004] In actual production, because the lens of the astigmatism type lamp bead needs to scatter and refract the light, the lens surface is usually designed with a special curved surface or microstructure to make the refractive index larger, while the refractive index of the packaging resin is lower, resulting in a large difference in the refractive index of the interface between the lens and the packaging resin. The light undergoes excessive total reflection in the package. If a high-power light source is used or a scene that requires a higher lighting brightness is used, the lamp bead may overheat and the brightness may be insufficient. In view of this, a astigmatism type SMD LED lamp bead is provided. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a diffuse light type SMD LED lamp bead.

[0006] The technical solution adopted to solve the above technical problems is:

[0007] A diffuse light type SMD LED lamp bead, comprising a heat sink, a light emitting component and a lens, wherein a packaging shell is provided at the surface of the heat sink where the light emitting component is mounted, and a resin block is provided at the light source of the light emitting component corresponding to the heat sink;

[0008] The packaging shell comprises a shell, a stepped hole with a vertical axis is opened in the middle of the shell for the light emitting element, the lens is embedded and installed in the stepped hole, a washer 1 and a washer 2 are symmetrically arranged at the edge of the horizontal end face of the lens, and a cover plate is installed at one end of the shell away from the light emitting element;

[0009] The lens comprises a main body, the main body is a cylindrical body coaxial with the stepped hole, and the main body is provided with astigmatism curved surfaces at two horizontal end surfaces;

[0010] A cavity 1 is formed between the cover plate, the horizontal end surface of the main body and the inner wall of the gasket 1, and a cavity 2 is formed between the horizontal end surface of the resin block and the main body and the inner wall of the gasket 2. The cavity 1 and the cavity 2 are filled with silicone oil.

[0011] Furthermore, the astigmatism curved surface includes an arcuate concentric annular groove 1 and an arcuate concentric annular groove 2 with equal radius, the arcuate concentric annular groove 1 is arranged on the top surface of the main body, and the arcuate concentric annular groove 2 is arranged on the bottom surface of the main body, and boundary rings are arranged at the junctions of the adjacent arcuate concentric annular grooves 1 and 2.

[0012] Through the above technical solution, the arc surface concentric annular groove one and the arc surface concentric annular groove two are concentric ring shaped, and the end faces of all the arc surface concentric annular grooves one can be combined with each other to form a complete concave arc surface, which, together with the arc surface concentric annular groove two, can achieve the divergence effect of a concave mirror. At the same time, compared with the concave mirror with a continuous end face, the segmented arc surface concentric annular groove one and the arc surface concentric annular groove two make the thickness of the lens edge thinner, reduce the weight of the lens and the overall thickness of the lamp bead, and the thinner vertical side wall of the lens blocks less light, so that light can escape from the lens more easily.

[0013] Furthermore, the astigmatism curved surface includes a first arc-surface concentric annular groove and a second arc-surface concentric annular groove with unequal radii, and the radius of the first arc-surface concentric annular groove corresponding to the upper and lower arc-surface concentric annular groove is greater than the radius of the second arc-surface concentric annular groove.

[0014] Through the above technical solution, the shape of the concentric rings can easily produce annular apertures with lower brightness between the rings. The staggered arrangement of the arc concentric ring groove 1 and the arc concentric ring groove 2 allows the high-brightness and low-brightness apertures to overlap with each other, thereby ensuring the uniformity of light output from the low-brightness lamp beads.

[0015] Furthermore, the shell is provided with a through hole coaxially connected with the stepped hole near the light emitting part, the resin block is inserted and installed in the through hole, and the shell is provided with an embedding groove away from the light emitting part, and the cover plate is embedded and installed in the embedding groove.

[0016] Through the above technical solution, the through hole and the resin block are directly opposite, the alignment degree of the light-emitting component and the lens is high, which reduces the situation where light cannot effectively escape from the resin block. The cover plate is recessed in the groove, which can reduce wear and tear compared to the protruding design, improve the smoothness and ensure the smooth emission of light.

[0017] Furthermore, the cover plate comprises a flat plate, and a lug is installed at the edge of the flat plate. The lug extends vertically perpendicular to the horizontal end surface of the flat plate, and the bottom surface of the lug is lower than the bottom surface of the flat plate.

[0018] Through the above technical solution, the flat plate is made of highly light-transmitting material and has ears at the edges, has a large surface area and has mutually perpendicular outer surfaces, which effectively prevents it from falling off during installation.

[0019] Furthermore, a through hole is opened at the shell corresponding to the support ear, the outer wall of the support ear is in sliding contact with the inner wall of the through hole, and an extension block is provided on the circumferential side wall of the resin block, and the support ear is in pressing contact with the extension block.

[0020] Through the above technical solution, the size of the through-hole corresponds to that of the support ear, and plug-in installation can be performed. After the support ear passes through the through-hole, it is in direct contact with the extension block of the resin block, so that part of the heat at the resin block can be transferred to the cover plate position to supplement the heat dissipation of the light-emitting component. At the same time, the top and bottom surfaces of the lens are heated evenly, reducing the expansion deformation caused by excessive heating on one side of the lens, thereby optimizing the propagation path of light and reducing the possibility of total reflection.

[0021] Furthermore, the cover plate further comprises a bent edge, wherein the bent edge is arranged at an edge of the cover plate facing an end face of the light emitting component, and the width of the bent edge gradually decreases as it moves away from the cover plate.

[0022] Through the above technical solution, the bent edge is designed at the edge of the cover plate, which increases the thickness of the cover plate at the edge and improves the overall structural strength of the cover plate.

[0023] Furthermore, the shell is provided with a receiving groove corresponding to the bent edge, the inner diameter of the receiving groove is equal to the maximum position of the bent edge width, the bent edge is inserted into the receiving groove, and the bottom surface of the bent edge is in pressing contact with the bottom surface of the receiving groove.

[0024] Through the above technical solution, the bent edge can be buckled into the receiving groove to improve the sealing effect. The thickness of the bent edge gradually decreases, making it easier to insert into the receiving groove, thereby facilitating assembly and positioning.

[0025] Furthermore, the light-emitting element includes pins, the pins are connected to a control chip via gold wires, and the control chip is electrically connected to the light-emitting chip.

[0026] Through the above technical solution, the pins can be connected to the contacts of the circuit board for power supply and control, and the control chip is used to receive control signals and control the power on and off of the light-emitting chip.

[0027] Furthermore, the heat sink also includes a substrate, a notch is opened on the substrate corresponding to the pin, the light emitting chip is installed in the middle of the substrate, and the substrate cooperates with the resin block to completely wrap the light emitting chip and the control chip.

[0028] Through the above technical solution, the light-emitting chip and the control chip are completely wrapped by the resin block, which effectively ensures the protection effect. The substrate adopts insulating and heat-conductive materials such as ceramics. The light-emitting chip and the control chip are directly fixed on the substrate. Part of the heat generated by the light-emitting chip can be transferred to the closely attached circuit board, thereby reducing the temperature inside the resin block.

[0029] The beneficial effects of the present invention are as follows:

[0030] (1) The present invention arranges a packaging shell, stacks a lens and a cover plate just above the light source of the light-emitting component, and fills silicone oil between the resin block and the lens, and between the cover plate and the lens to form a transition layer with a medium refractive index, so as to avoid a large refractive index difference at the junction that causes serious total reflection, so that the light generated by the light-emitting component can be fully transmitted and diverged, avoiding excessive brightness loss, and preventing excessive light from being confined in the lamp bead and causing high operating temperature;

[0031] (2) The present invention optimizes the lens so that the light passing through the lens is refracted and scattered by the astigmatism curved surface and then diverges in all directions. The astigmatism curved surface is designed as an annular groove with an arc surface and connected by a junction ring, thereby reducing the thickness of the lens edge without affecting the astigmatism effect. It can also prevent the light path from being blocked due to the excessive thickness of the lens edge and the large thickness of the lamp bead wall, so that the light can be more easily evenly distributed within a larger angle range;

[0032] (3) The present invention improves the cover plate. The silicone oil combined with the cover plate with ears can balance the temperature difference between the two end faces of the lens, so that the top and bottom ends of the lens are heated relatively evenly, reducing the deformation of the lens caused by uneven thermal expansion. In addition, the cover plate is in direct contact with the outside atmosphere, which can supplement the heat dissipation of the light-emitting component and prevent the temperature of the light-emitting component from being too high. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 It is a schematic diagram of the splitting of the present invention;

[0035] Figure 3 is an enlarged schematic cross-sectional view of the lens of the present invention;

[0036] Figure 4 is a structural schematic diagram of another cover plate of the present invention;

[0037] Figure 5 is with Figure 4 A schematic diagram of a disassembled heat sink sheet adapted to the cover plate;

[0038] Figure 6 is with Figure 4 A schematic diagram of the structure of the packaging shell adapted to the cover plate in FIG.

[0039] Figure 7 yes Figure 4 The cover plate in Figure 5 The heat sink in Figure 6 Schematic diagram of assembly between the packaging shells;

[0040] Figure 8 yes Figure 7 A schematic diagram of the structure enlarged at a in FIG.

[0041] Fig. 9 is a schematic diagram for comparing the cross-sectional structures of the lens and the concave mirror of the present invention;

[0042] Fig.10 It is a schematic diagram of an enlarged cross section of another lens of the present invention.

[0043] Figure numerals: 1. heat sink; 11. substrate; 12. resin block; 13. extension block; 2. light-emitting part; 21. pin; 22. light-emitting chip; 23. control chip; 3. packaging shell; 31. shell; 32. through hole; 33. stepped hole; 34. embedded groove; 35. through opening; 36. accommodating groove; 4. cover plate; 41. flat plate; 42. ear; 43. bent edge; 5. lens; 51. main body; 52. arc surface concentric annular groove one; 53. arc surface concentric annular groove two; 54. junction ring; 55. integral arc surface groove; 56. concave mirror; 6. gasket one; 7. gasket two; 8. cavity one; 9. cavity two. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] like Figure 1 - Fig.10 As shown, this embodiment provides a diffuse light type SMD LED lamp bead, including a heat sink 1, a light emitting element 2 and a lens 5, referring to Figure 1 The heat sink 1 is used as a base to provide installation space for the light emitting element 2 and the lens 5. The heat sink 1 is provided with a packaging shell 3 on the surface where the light emitting element 2 is installed. Figure 2 The packaging shell 3 provides mechanical and electrical protection for the light emitting element 2 and the lens 5, wherein a resin block 12 is provided at the heat sink 1 corresponding to the light source of the light emitting element 2, and the resin block 12 is made of a transparent material, which seals the light emitting element 2 to ensure that the light emitting element 2 emits light stably for a long time;

[0046] Because the lens 5 of the astigmatism lamp bead needs to scatter and refract the light, that is, the refractive index of the surface of the lens 5 is relatively large, while the refractive index of the material of the resin block 12 is relatively low, resulting in a large difference in the refractive index of the interface between the lens 5 and the resin block 12, which cannot effectively guide the light to escape from the packaging material, and may cause the light to be totally reflected in the package, thereby causing the lamp bead to overheat and insufficient brightness. According to the actual problems existing in the astigmatism lamp bead, a specific improvement plan is proposed;

[0047] For the package case 3, refer to Figure 2 The encapsulation shell 3 includes a shell 31, which is made of a light-proof resin material. The hard shell 31 can play an effective protective role. The light-emitting element 2 in the middle of the shell 31 is provided with a stepped hole 33 with a vertical axis. The stepped hole 33 is opened just above the light-emitting element 2, and the lens 5 is embedded and installed in the stepped hole 33. The stepped hole 33 provides an installation position for the lens 5 and plays a positioning role, ensuring that the lens 5 is also just above the light-emitting element 2, which can provide a sufficient passage path for the light emitted by the light-emitting element 2, so that as much light as possible can be emitted outward after passing through the lens 5, thereby improving the insufficient brightness;

[0048] For lens 5, refer to Figure 2 The lens 5 includes a main body 51. The main body 51 is a cylindrical body coaxial with the stepped hole 33. The outer diameter of the main body 51 is smaller than the inner diameter of the stepped hole 33, so that the main body 51 can be smoothly installed. The main body 51 is provided with astigmatism curved surfaces at two horizontal end surfaces. The design of the astigmatism curved surfaces increases the scattering angle of the light, so that the light of the LED can cover a wider area.

[0049] It should be emphasized that gasket 1 6 and gasket 2 7 are symmetrically arranged at the edge of the horizontal end surface of the lens 5, a cover plate 4 is installed at one end of the shell 31 away from the light-emitting element 2, gasket 1 6 and gasket 2 7 have a certain thickness, and the lens 5 can be suspended between the cover plate 4 and the light-emitting element 2, and a cavity 1 8 is formed between the cover plate 4, the horizontal end surface of the main body 51 and the inner wall of the gasket 1 6, and a cavity 2 9 is formed between the horizontal end surface opened by the resin block 12 and the main body 51 and the inner wall of the gasket 2 7, and the cavity 1 8 and the cavity 2 9 are filled with silicone oil. Because the refractive index of the resin block 12 of the light-emitting element 2 is low, the refractive index of the lens 5 is high, and the refractive index of the cover plate 4 is low, silicone oil or modified silicone oil is used as a transition layer to obtain silicone oil with a refractive index between the resin block 12, the cover plate 4 and the lens 5, thereby reducing the refractive index difference at the junction of the resin block 12, the lens 5 and the cover plate 4, so that the light can pass through the lens 5 smoothly, reduce the occurrence of total reflection, and prevent the lamp beads from overheating due to excessive total reflection.

[0050] In a further embodiment, since there are many astigmatism curved surfaces that can scatter and refract, a specific configuration is disclosed, referring to Figure 3 and Fig. 9 , because the concave mirror 56 is thick around and thin in the middle, it has the function of diverging light, but it has an integral arc groove 55, which causes the concave mirror 56 to be thick around. When used as a lens 5 of a lamp bead, the thicker edge will cause the packaging shell 3 of the lamp bead to be thicker, affecting the overall size of the lamp bead. At the same time, the thicker edge of the concave mirror 56 will also cause more light to be reflected and blocked by its circumferential side wall, so that too much light is confined in the concave mirror 56, and the area that the light can cover is limited. Therefore, referring to Figure 3By dividing the overall arc surface groove 55 into multiple circular ring structures, and then processing them separately on the end face of the lens 5 with uniform thickness, a corresponding astigmatism curved surface can be formed, wherein the arc surface concentric annular groove 1 52 and the arc surface concentric annular groove 2 53 with equal radius are included. The arc surface concentric annular groove 1 52 is a plurality of concentric circular rings, and forms an arc-shaped annular end face on the top face of the lens 5. Similarly, the arc surface concentric annular groove 2 53 has the same shape as the arc surface concentric annular groove 1 52, but is arranged on the bottom face of the lens 5. Because there is a drop at the junction of the adjacent arc surface concentric annular groove 1 52 and the arc surface concentric annular groove 2 53, a junction ring 54 is provided for transition. On the premise of having the astigmatism function of the concave mirror 56, the edge thickness of the lens 5 itself can be reduced, the thickness of the finished product can be effectively reduced, and the light passing efficiency can be improved.

[0051] In a further embodiment, due to the large number of astigmatism surfaces that can scatter and refract, another specific configuration is disclosed, referring to Fig.10 If a concentric ring groove structure is used for astigmatism, a brightness difference will be formed at the junction of the junction ring 54 and the arc surface concentric ring groove 1 52 and the arc surface concentric ring groove 2 53 due to the height difference of the junction ring 54 and the change in the bending direction. In addition, the radius of the concentric rings on the top and bottom surfaces of the lens 5 is consistent, and this brightness will be superimposed, resulting in an aperture with a large brightness difference, which is more obvious in low-brightness astigmatism lamp beads. In view of this, the radius of the upper and lower corresponding arc surface concentric ring groove 1 52 is larger than the radius of the arc surface concentric ring groove 2 53, so that the junction rings 54 on the upper and lower surfaces of the lens 5 are staggered with each other, reducing the brightness difference and making the brightness of the lamp beads more uniform.

[0052] In a further embodiment, referring to Figure 3 A through hole 32 coaxially connected to the stepped hole 33 is provided at the shell 31 near the light-emitting component 2. The resin block 12 is inserted and installed in the through hole 32. The inner diameter of the through hole 32 is consistent with the outer diameter of the resin block 12, which plays a positioning role. The resin block 12 is sealed by the shell 31 and will not contact the outside air and moisture, which can delay the aging of the surface, ensure its optical performance is stable, and prevent more light from being totally reflected on the surface of the resin block 12. The stepped hole 33 is coaxially connected to the through hole 32. The alignment degree of the light-emitting component 2 and the lens 5 is high, ensuring that the light diffusion path is open and reducing the situation where the light cannot effectively escape from the resin block 12. A groove 34 is provided at the shell 31 away from the light-emitting component 2. The cover plate 4 is embedded and installed in the groove 34. The cover plate 4 is recessed in the groove 34. The top surface of the cover plate 4 is lower than the ground of the groove 34. Compared with the protruding design, it can reduce wear and tear, improve the smoothness and ensure the smooth emission of light.

[0053] In a further embodiment, considering the influence of high temperature on the shape of the lens 5, refer to Figure 4In high-power lamp beads, a new cover plate 4 is designed to optimize the heat distribution inside the lamp beads. The cover plate 4 includes a flat plate 41. The flat plate 41 is made of a high-light-transmittance material and has ears 42 at the edge. The ears 42 have a large surface area and have mutually perpendicular outer surfaces, which can effectively prevent them from falling off during installation. The ears 42 extend vertically perpendicular to the horizontal end surface of the flat plate 41. The bottom surface of the ears 42 is lower than the bottom surface of the flat plate 41 and can be inserted into the shell 31 to extend out, closer to the light-emitting component 2, and transfer more heat from the light-emitting component 2 to the position of the cover plate 4 for dissipation, thereby reducing the temperature at the position of the light-emitting component 2.

[0054] In a further embodiment, in order to adapt to the improved cover plate 4, a specific housing 31 and resin block 12 are provided, referring to Figure 5 - Figure 8 A through hole 35 is provided at the shell 31 corresponding to the ear 42, and the outer wall of the ear 42 is in sliding contact with the inner wall of the through hole 35. The size of the through hole 35 corresponds to that of the ear 42, so plug-in installation can be performed, and the installation is fast and the positioning is accurate. At the same time, an extension block 13 is provided on the circumferential side wall of the resin block 12, and the ear 42 is in pressure contact with the extension block 13. After the ear 42 passes through the through hole 35, it is in direct contact with the extension block 13 of the resin block 12, so that part of the heat at the resin block 12 can be more directly transferred to the position of the cover plate 4, and the larger surface area of ​​the cover plate 4 is used for supplementary heat dissipation of the light-emitting component 2. At the same time, the lens 5 is located between the light-emitting component 2 and the cover plate 4. This heat conduction can make the top and bottom surfaces of the lens 5 evenly heated, reduce the edge deformation caused by excessive heating on one side of the lens 5, ensure the flatness of the lens 5, thereby optimizing the propagation path of light and reducing the possibility of total reflection.

[0055] In a further embodiment, referring to Figure 4 The cover plate 4 also includes a bent edge 43, which is arranged at the edge of the cover plate 4 facing the end face of the light-emitting element 2, increasing the thickness of the edge of the cover plate 4 and improving the overall structural strength of the cover plate 4. It should be emphasized that fluorescent powder is coated on the surface of the cover plate 4. When the LED chip emits ultraviolet light or blue light, these lights will excite the phosphor in the fluorescent powder to emit visible light. Through the conversion of the fluorescent powder, the LED lamp beads can generate more visible light, thereby improving the overall light effect.

[0056] In a further embodiment, referring to Figure 7 and Figure 8Since the cover plate 4 is mostly made of glass and is relatively fragile, a receiving groove 36 is provided at the shell 31 corresponding to the bent edge 43. The width of the bent edge 43 gradually decreases as it moves away from the cover plate 4. The inner diameter of the receiving groove 36 is equal to the maximum position of the width of the bent edge 43. The bent edge 43 is inserted into the receiving groove 36. The bent edge 43 can be buckled into the receiving groove 36 to improve the sealing effect. The thickness of the bent edge 43 gradually decreases, and it can be more easily inserted into the receiving groove 36, which is convenient for assembly and positioning. The bottom surface of the bent edge 43 is pressed and contacted with the bottom surface of the receiving groove 36, which supports the edge of the cover plate 4 after installation is completed to avoid damage caused by pressure on the edge during installation.

[0057] In a further embodiment, referring to Figure 5 The light-emitting element 2 includes a pin 21, which can be connected to the contact of the circuit board to supply power current and transmit control signals. The pin 21 is connected to a control chip 23 through a gold wire. The control chip 23 is used to receive control signals and control the power on and off of the light-emitting chip 22. The control chip 23 is electrically connected to the light-emitting chip 22. The light-emitting chip 22 is made of silicon or gallium nitride and can emit continuous light when powered on.

[0058] In a further embodiment, referring to Figure 5 The heat sink 1 also includes a substrate 11. A notch is opened at the position of the substrate 11 corresponding to the pin 21 to facilitate the combination and positioning of the pin 21. The light-emitting chip 22 is installed in the middle of the substrate 11. The substrate 11 is made of insulating and heat-conductive materials such as ceramics. The light-emitting chip 22 and the control chip 23 are directly fixed on the substrate 11 and are electrically connected to each other by welding gold wires. A part of the heat generated by the light-emitting chip 22 can be transferred to the circuit board or other components in direct contact, thereby reducing the temperature inside the resin block 12. The resin block 12 completely wraps the light-emitting chip 22 and the control chip 23, effectively ensuring the protection effect.

[0059] The working principle of this embodiment is as follows:

[0060] During production, the lens 5 and the cover plate 4 are stacked just above the light source of the light emitting element 2, and silicone oil is filled between the resin block 12 and the lens 5, and between the cover plate 4 and the lens 5 to form a transition layer with a medium refractive index, so as to avoid a large difference in refractive index at the junction that causes severe total reflection, so that the light generated by the light emitting element 2 can be fully transmitted and avoid excessive brightness loss;

[0061] When in use, the light emitting element 2 as a light source will generate a point light source and continue to emit light under the protection of the resin block 12. When the light passes through the lens 5, it is refracted and scattered by the astigmatism surface and diverges in all directions. The astigmatism surface is designed as an arc-shaped annular groove, which reduces the thickness of the edge of the lens 5 and plays the role of astigmatism of the concave mirror 56. It can also prevent the light path from being blocked due to the large wall thickness of the lamp bead caused by the excessive thickness of the edge of the lens 5, so that the light can be more easily evenly distributed in a larger angle range;

[0062] Silicone oil, as a heat-conducting liquid, can disperse the heat of the lens 5 near the light-emitting element 2 to the entire lens 5, and cooperate with the cover plate 4 with the ears 42 to make the top and bottom ends of the lens 5 relatively evenly heated. The cover plate 4 is in direct contact with the outside atmosphere, which can supplement the heat dissipation of the light-emitting element 2, reduce the deformation of the lens 5 caused by uneven thermal expansion, ensure that light can pass through the lens 5 smoothly, prevent the temperature of the light-emitting element 2 from being too high, and avoid excessive total reflection of light by the lens 5 due to deformation.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A diffuse light type SMD LED lamp bead, comprising a heat sink (1), a light emitting element (2) and a lens (5), characterized in that: A packaging shell (3) is provided at the surface of the heat sink (1) where the light emitting component (2) is mounted, and a resin block (12) is provided at the location of the heat sink (1) corresponding to the light source of the light emitting component (2); The packaging shell (3) comprises a shell (31), a stepped hole (33) with a vertical axis is provided in the middle of the light emitting element (2) of the shell (31), the lens (5) is embedded and installed in the stepped hole (33), a gasket 1 (6) and a gasket 2 (7) are symmetrically arranged at the edge of the horizontal end surface of the lens (5), and a cover plate (4) is installed at one end of the shell (31) away from the light emitting element (2); The lens (5) comprises a main body (51), the main body (51) is a cylindrical body coaxial with the stepped hole (33), and the main body (51) is provided with astigmatism curved surfaces at two horizontal end surfaces; A first cavity (8) is formed between the horizontal end surface of the cover plate (4) and the main body (51) and the inner wall of the first gasket (6); a second cavity (9) is formed between the horizontal end surface of the resin block (12) and the main body (51) and the inner wall of the second gasket (7); the first cavity (8) and the second cavity (9) are filled with silicone oil, and the refractive index of the silicone oil is between that of the resin block (12) and the cover plate (4), and the refractive index of the silicone oil is between that of the resin block (12) and the lens (5).

2. The diffuser type SMD LED lamp bead according to claim 1, characterized in that: The astigmatism curved surface comprises a first arc surface concentric annular groove (52) and a second arc surface concentric annular groove (53) with equal radii, the first arc surface concentric annular groove (52) being arranged on the top surface of the main body (51), the second arc surface concentric annular groove (53) being arranged on the bottom surface of the main body (51), and a junction ring (54) being arranged at the junction of adjacent first arc surface concentric annular groove (52) and second arc surface concentric annular groove (53).

3. The diffuse light type SMD LED lamp bead according to claim 1, characterized in that: The astigmatism curved surface comprises a first arc surface concentric annular groove (52) and a second arc surface concentric annular groove (53) of unequal radii, wherein the radius of the first arc surface concentric annular groove (52) corresponding to the upper and lower arc surface is greater than the radius of the second arc surface concentric annular groove (53).

4. The diffuse light type SMD LED lamp bead according to claim 1, characterized in that: The housing (31) is provided with a through hole (32) coaxially connected to the stepped hole (33) near the light-emitting component (2), the resin block (12) is inserted and installed in the through hole (32), and the housing (31) is provided with an embedding groove (34) away from the light-emitting component (2), and the cover plate (4) is embedded and installed in the embedding groove (34).

5. The diffuse light type SMD LED lamp bead according to claim 1, characterized in that: The cover plate (4) comprises a flat plate (41), and a support ear (42) is installed at the edge of the flat plate (41). The support ear (42) extends vertically perpendicular to the horizontal end surface of the flat plate (41), and the bottom surface of the support ear (42) is lower than the bottom surface of the flat plate (41).

6. The diffuse light type SMD LED lamp bead according to claim 5, characterized in that: The shell (31) is provided with a through opening (35) at a position corresponding to the support ear (42), the outer wall of the support ear (42) is in sliding contact with the inner wall of the through opening (35), the circumferential side wall of the resin block (12) is provided with an extension block (13), and the support ear (42) is in pressing contact with the extension block (13).

7. The diffuser type SMD LED lamp bead according to claim 1, characterized in that: The cover plate (4) further comprises a bent edge (43), wherein the bent edge (43) is arranged at an edge of the cover plate (4) facing the end surface of the light-emitting element (2), and the width of the bent edge (43) gradually decreases as it moves away from the cover plate (4).

8. The diffuse light type SMD LED lamp bead according to claim 7, characterized in that: The housing (31) is provided with a receiving groove (36) at a position corresponding to the bent edge (43); the inner diameter of the receiving groove (36) is equal to the maximum position of the width of the bent edge (43); the bent edge (43) is inserted into the receiving groove (36); and the bottom surface of the bent edge (43) is in pressing contact with the bottom surface of the receiving groove (36).

9. The diffuser type SMD LED lamp bead according to claim 1, characterized in that: The light-emitting element (2) comprises a pin (21), the pin (21) being connected to a control chip (23) via a gold wire, and the control chip (23) being electrically connected to a light-emitting chip (22).

10. The diffuse light type SMD LED lamp bead according to claim 9, characterized in that: The heat sink (1) further comprises a substrate (11), wherein a notch is provided on the substrate (11) at a position corresponding to the pin (21), the light-emitting chip (22) is mounted in the middle of the substrate (11), and the substrate (11) cooperates with the resin block (12) to completely encapsulate the light-emitting chip (22) and the control chip (23).

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