Box dam for reflecting light and packaging structure

Abstract

On one hand, the utility model discloses a box dam used for reflecting light rays, the surface of the box dam used for receiving the light rays emitted by a light-emitting part and forming reflection is a first surface, the section line of the first surface in the thickness direction of the box dam is in a parabola shape, and the light-emitting part is arranged at the vertex position far away from a parabola opening. A step is further formed on the side, away from the light-emitting part, of the box dam, and a light-transmitting covering part is installed on the step. On the other hand, the utility model further discloses a packaging structure comprising the box dam, millimeter-level LED light source reflection is achieved through the compact box dam structure, near-field dodging within the range of about 1 mm-40 mm away from the LED packaging structure is achieved on the premise that the size and the thickness of the light source are small, and the size and the thickness of the dodging LED packaging structure are optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of diode packaging, and more specifically, to a dam for reflecting light emitted by a light-emitting component, and a packaging structure with the dam. Background Art

[0002] As an efficient light source, light-emitting diodes are widely used in various fields of life and production, with many characteristics such as environmental protection, power saving, and long life. By changing the wavelength of the light emitted by the diode, it can be used as visible light for lighting or as deep ultraviolet light with disinfection effect.

[0003] The light output angle of a light emitting diode is usually large, but the actual effective irradiation angle is only 25% of the light output angle, resulting in uneven light output, weak irradiation intensity at the edge of the illuminated area, and low light utilization. At present, commercial LED light uniformity mostly adopts the method of secondary optical design, which achieves uniform light distribution over a certain area by adding a secondary optical lens or a free-form surface lens to the LED packaging structure. However, this type of lens is large in size and is not suitable for LED light sources that are getting smaller and smaller in size. Moreover, as the size of the lens decreases, its optical effect also deteriorates, and the purpose of setting cannot be achieved.

[0004] As the volume of LED light sources becomes smaller and smaller, how to reflect more light through a dam structure is a competitive research issue in this field. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of uneven light emission and low light utilization of the existing LED packaging structure, and to provide a dam, which is used to reflect the light emitted by the light-emitting element, and to achieve near-field uniform light close to the LED packaging structure under the premise of small light source volume and thickness, so as to eliminate the above defects. At the same time, the utility model also provides a packaging structure, which applies the above dam structure.

[0006] The technical solution adopted by the present utility model is as follows: a dam for reflecting light. The dam is used to receive the light emitted by a light-emitting component, and the surface for forming reflection is the first surface. The cross-sectional line of the first surface along the thickness direction of the dam is in a parabolic shape, and the light-emitting component is arranged at a vertex position far from the opening of the parabola. When the light emitted by the light-emitting component irradiates the first surface, the first surface can reflect and adjust these lights into near-parallel lights, so that more and better lights can be emitted from the dam, improving the light output efficiency and enhancing the uniformity of light output. A step is further formed on the side of the dam away from the light-emitting component, and a light-transmitting covering member is installed on the step. The step serves as a positioning structure for the light-transmitting covering member, enabling the light-transmitting covering member to be accurately installed on the dam. The light-transmitting covering member can be a flat, highly light-transmissive glass cover plate or resin cover plate, or can also be a curved lens with certain optical effects.

[0007] Furthermore, the reflectivity of the first surface to light in the ultraviolet band is greater than 80%. Specifically, it can be achieved by setting a polishing layer, a precision carving layer, a coating layer or a metal plating layer.

[0008] Furthermore, as one of the solutions, the first surface is provided with a polishing layer, and the first surface is polished by a polishing device to form a polishing layer.

[0009] Furthermore, as another solution, the first surface is provided with a precision carving layer. By performing CNC precision carving on the first surface, a precision carving layer is formed, which can also improve the reflectivity of the curved surface to light in the ultraviolet band.

[0010] Furthermore, as yet another solution, the first surface is provided with a coating layer or a metal plating layer. The coating layer is coated on the surface of the first surface by electroplating or adhesion. The film is a high-reflective film, and the high-reflective film of existing mature technologies can usually achieve a light reflectivity of 90%. Similarly, the metal plating layer is to cover a layer of metal material, such as highly reflective metals like silver and aluminum, on the first surface by electroplating, which can also improve the reflectivity of the first surface to visible light or light in the ultraviolet band.

[0011] Furthermore, the distance from the top to the bottom of the first surface is H1, and the distance from the top surface of the light-emitting component to the bottom of the first surface is H2, and H1≥H2, that is, the height of the dam is higher than the height of the light-emitting component, or at least, the height of the dam is equal to the height of the light-emitting component; the radius of the opening on the side of the dam close to the bottom of the first surface is R1, and the radius of the opening on the side of the dam close to the top of the first surface is R2, and R1<R2, ensuring that there is enough space in the cavity formed by the dam to reflect the light emitted by the light-emitting component and can play a role in concentrating light.

[0012] Furthermore, the radius of the opening of the dam close to the light-emitting component is set between 0.5mm and 6.0mm, that is, 0.5mm≤R1≤6.0mm; the radius of the opening of the dam away from the light-emitting component is set between 1.0mm and 8.0mm, that is, 1.0mm≤R2≤8.0mm.

[0013] Furthermore, R1 is larger than the maximum width of the light emitting element projected along the thickness direction of the dam and smaller than twice the maximum width of the light emitting element projected along the thickness direction of the dam.

[0014] In addition, the utility model also provides a packaging structure, which includes the above-mentioned dam for reflecting light and meets the following characteristics:

[0015] If the cross-sectional line of the first surface along the thickness direction of the dam is continuous, the light-emitting element is arranged on the top surface of the first surface away from the parabola opening and is insulated from the first surface;

[0016] If the cross-sectional line of the first surface along the thickness direction of the dam is discontinuous, a substrate is further included, the dam is connected to the substrate on one side close to the bottom of the first surface, the surface of the substrate close to the dam is the second surface, and the light-emitting element is arranged on the top surface of the second surface and is insulated from the second surface;

[0017] The light emitting element is a light emitting chip or a COB light source.

[0018] Furthermore, a medium with a refractive index between 1.4 and 2.0 is filled in the cavity formed by the first surface and the light-transmitting cover, or in the cavity formed by the first surface, the second surface and the light-transmitting cover.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] Millimeter-level LED light source reflection is achieved through a compact dam structure, and near-field uniform light is achieved within a range of about 1mm-40mm from the LED packaging structure while keeping the light source volume and thickness small. This optimizes the volume and thickness issues of the uniform light LED packaging structure. The overall structure is compact, making the LED packaging structure suitable for more special scenarios. Compared with the existing technology, it can improve the light output efficiency and uniformity of the LED packaging structure, and has high economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of one type of enclosure dam in the utility model;

[0022] Figure 2 This is a schematic diagram of a packaging structure of the utility model;

[0023] Figure 3This is a schematic structural diagram of another dam / packaging structure of the utility model.

[0024] In the attached figure:

[0025] 1-dam; 101-first surface; 102-second surface; 2-stand; 3-light-transmitting cover; 4-substrate; 5-light-emitting chip; 6-COB light source; 7-medium; 8-insulating member.

[0026] The direction of the arrow in the drawings is the direction in which the light emitted by the light emitting element is emitted, or the direction in which the light is emitted after being reflected by the reflective surface. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0028] The same or similar reference numerals in the drawings of the embodiments of the present utility model correspond to the same or similar parts; in the description of the present utility model, it should be understood that if the terms "front", "rear", "left", "right" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for exemplary explanations and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances. In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features.

[0029] Embodiment 1

[0030] like Figure 1 As shown, this embodiment provides a dam 1, the dam 1 is used to receive the light emitted by the light-emitting element and form a reflection, the reflecting surface is a first surface 101, the cross-sectional line of the first surface 101 along the thickness direction of the dam 1 is in a parabola shape, and the light-emitting element is arranged at a vertex position away from the parabola opening. Preferably, the light-emitting element is arranged at a focal position of the first surface 101.

[0031] When the light emitted by the light emitting element irradiates the first surface 101 on the dam 1, the first surface 101 can adjust the light into nearly parallel light through reflection, so that more and better light can be emitted from the dam 1, reducing the loss of light inside the dam 1 and improving the light extraction efficiency. At the same time, the emitted nearly parallel light can also be more conveniently and effectively utilized, improving the light utilization rate and making the light extraction uniformity better.

[0032] A step 2 is formed on the side of the dam 1 away from the light-emitting component, and a light-transmitting cover 3 is installed on the step 2. The step 2 serves as a positioning structure for the light-transmitting cover 3, and enables the light-transmitting cover 3 to be accurately installed on the dam 1. In this embodiment, the light-transmitting cover 3 is a flat, highly light-transmitting glass cover or resin cover. While transmitting light, the light-transmitting cover 3 can also be used to dissipate the heat generated when the light-emitting component is working. Of course, in some other embodiments, the light-transmitting cover 3 can also be a curved lens with a certain optical effect.

[0033] The light-emitting element described in this embodiment is an LED light-emitting chip 5. Three light-emitting chips 5 are selected as test samples and marked as light-emitting element 1, light-emitting element 2 and light-emitting element 3 in sequence. At the same time, the dam structure of the prior art is selected as a control example. The light-emitting element 1, light-emitting element 2 and light-emitting element 3 are placed in the dam of the prior art and the dam 1 described in this embodiment in sequence, and the light-emitting effect is tested at a distance of 40 mm from the light-emitting element. The light-emitting effect is shown in Table 1 below:

[0034] Table 1 Comparison of light reflection results of dams of different shapes

[0035]

[0036]

[0037] In the above table, the first group, the second group, and the third group respectively represent that the light emitting element 1, the light emitting element 2, and the light emitting element 3 are placed in the dam 1 described in this embodiment; the fourth group, the fifth group, and the sixth group respectively represent that the light emitting element 1, the light emitting element 2, and the light emitting element 3 are placed in the dam of the prior art. The first group and the fourth group are a group of control examples, the second group and the fifth group are a group of control examples, and the third group and the sixth group are a group of control examples.

[0038] In the above table, I represents current, the unit is ampere (A); U represents voltage, the unit is volt (V); Represents luminous flux in milliwatts (mW); λp represents peak wavelength in nanometers (nm); FWHM represents half-wave width in nanometers (nm). Among them, luminous flux describes the ability of a light source to produce a strong visual response per unit time, and is also commonly used to measure the total amount of light emitted by a light source. The higher the luminous flux, the brighter the light source, that is, the better the reflection effect of the dam 1 on the light emitted by the light-emitting component. In the packaging structure, the light-emitting component, namely the LED light-emitting chip 5, requires constant current drive rather than constant voltage drive. Therefore, in the above test, the test current I is maintained at a constant current of 0.35A. Since the contact resistance of each test and the fixture will be slightly different, the voltage of the same LED light-emitting chip 5 will fluctuate within a certain range each time it is tested, but it does not affect the test results.

[0039] Under constant current drive, the luminous flux data of the first group increased by 33.26% compared with the fourth group, the luminous flux data of the second group increased by 32.89% compared with the fifth group, and the luminous flux data of the third group increased by 28.44% compared with the sixth group. In other words, under the same input current, compared with the dam of the prior art, the application of the dam 1 described in this embodiment can increase the light extraction efficiency of the LED light-emitting chip 5 by about 31% on average, which significantly improves the utilization rate of light.

[0040] At the same time, in the above-mentioned test, the light-emitting component is arranged at the focal position of the first surface 101. It is observed that the light emission angle of the LED light-emitting chip 5 after being reflected by the dam 1 described in this embodiment is about 25°, while the light emission angle after being reflected by the dam of the prior art is about 60°. The dam 1 described in this embodiment makes the light emission of the light-emitting component more concentrated and uniform.

[0041] Embodiment 2

[0042] like Figure 1 As shown, this embodiment is improved on the basis of the first embodiment. Specifically, the reflectivity of the first surface 101 to the light in the ultraviolet band is greater than 80% by setting a polishing layer, a fine carving layer, a coating layer or a metal coating layer. In this embodiment, the first surface 101 is polished by a polishing device to form a polishing layer, that is, the roughness of the first surface 101 is reduced by mechanical, chemical or electrochemical action, thereby obtaining a smooth surface or a mirror gloss to improve the reflectivity of light.

[0043] In some other embodiments, the first surface 101 is further provided with a fine carving layer. By performing CNC fine carving on the first surface 101 to form the fine carving layer, the reflectivity of the first surface 101 to light in the ultraviolet band can also be improved.

[0044] In some other embodiments, a coating layer or a metal plating layer is provided on the first surface 101. The coating layer is formed on the surface of the first surface 101 by electroplating or adhesion. The film is a high-reflective film, and a high-reflective film of existing mature technologies can usually achieve a light reflectivity of 90%. Similarly, the metal plating layer is formed by electroplating a layer of metal material, such as highly reflective metals like silver, copper, aluminum, etc., on the first surface 101, which can also improve the reflectivity of the first surface 101 to visible light or light in the ultraviolet band.

[0045] Embodiment III

[0046] As Figure 3 shown, this embodiment provides another dam 1. The dam 1 is used to receive the light emitted by the light-emitting element and the surface for forming reflection is the first surface 101. The cross-sectional line of the first surface 101 in the thickness direction of the dam 1 is in a parabolic shape. Different from Embodiment I, both ends of the dam 1 in the thickness direction are provided with openings. Among them, the distance from the top to the bottom of the first surface 101 is H1, the distance from the top surface of the light-emitting element to the bottom of the first surface 101 is H2, and H1≥H2, that is, the height of the dam 1 is higher than the height of the light-emitting element, or at least, the height of the dam 1 is equal to the height of the light-emitting element; the radius of the opening on the side of the dam 1 close to the bottom of the first surface 101 is R1, and the radius of the opening on the side of the dam 1 close to the top of the first surface 101 is R2, and R1<R2, ensuring that there is enough space in the cavity formed by the dam 1 to reflect the light emitted by the light-emitting element and can achieve a light-gathering effect.

[0047] In this embodiment, the diameter and height of the dam 1 are in millimeters. The distance from the top to the bottom of the first surface 101 is H1 = 1.0 mm, and the distance from the top surface of the light-emitting element to the bottom of the first surface 101 is H2 = 0.4 mm. If the distance H1 from the top to the bottom of the first surface 101 (i.e., the top surface of the dam 1) is too small, it will lead to poor light emission uniformity of the light-emitting element and poor parallelism of light-gathering. If the distance H1 from the top to the bottom of the first surface 101 is too large, it will cause the light emitted by the light-emitting element to be reflected multiple times in the dam 1, resulting in light loss. Of course, in some other embodiments, the height of the dam 1 can also be the same as the height of the light-emitting element.

[0048] The radius of the opening of the dam 1 close to the light-emitting element is set to 1.0 mm. Of course, in some other embodiments, the radius R1 can also be 0.5 mm, 2.0 mm, 3.5 mm, 5.0 mm, 6.0 mm, or any value between 0.5-6.0 mm. The radius of the opening of the dam 1 away from the light-emitting element is set to 1.55 mm. Of course, in some other embodiments, the radius R2 can also be 1.0 mm, 3.0 mm, 5.0 mm, 7.0 mm, 8.0 mm, or any value between 1.0-8.0 mm.

[0049] Preferably, R1 is greater than the maximum width of the light-emitting element projected in the thickness direction of the dam 1 and less than twice the maximum width of the light-emitting element projected in the thickness direction of the dam 1, so as to obtain the best light-emitting effect. For example, when the maximum width of the light-emitting element projected in the thickness direction of the dam 1 is 1 mm, the preparation length of the radius R1 is greater than 1 mm and less than 2 mm. The maximum width of the light-emitting element projected in the thickness direction of the dam 1 represents the maximum size of the light-emitting element. If the light-emitting element is square, the maximum width represents the length of the diagonal of the light-emitting element; if the light-emitting element is round, the maximum width represents the diameter of the light-emitting element.

[0050] Embodiment 4

[0051] See also Figure 2 , this embodiment provides a packaging structure, including the dam 1 and the LED light-emitting chip 5 described in the first embodiment, the dam 1 is used to receive the light emitted by the light-emitting chip 5 and form a reflection, the reflecting surface is the first surface 101, the cross-section line of the first surface 101 along the thickness direction of the dam 1 is in a parabola shape, and the cross-section line is a continuous parabola. The light-emitting chip 5 is arranged on the top surface of the first surface 101 away from the parabola opening and is insulated from the first surface 101. Specifically, an insulating member 8 is arranged between the light-emitting chip 5 and the first surface 101. The insulating member 8 insulates the light-emitting chip 5 from the dam 1. An electrode (not shown in the figure) is arranged on the side of the insulating member 8 that contacts the light-emitting chip 5, which is used to provide power for the light-emitting chip 5. The light-emitting chip 5 is a single solid semiconductor chip, which is used as the light source of the packaging structure and is placed at the center of the groove of the dam 1, that is, the light-emitting chip 5 is arranged at the focal position of the first surface 101. The light emitted by the light-emitting chip 5 can be infrared light, visible light or ultraviolet light.

[0052] In addition, the packaging structure also includes a step 2 and a light-transmitting cover 3. The step 2 is formed on the side of the dam 1 away from the light-emitting chip 5, and is directly processed and integrally formed on the dam 1 by engraving equipment or other processing equipment. The step 2 serves as a positioning structure for the light-transmitting cover 3, and can accurately install the light-transmitting cover 3 on the dam 1. The light-transmitting cover 3 is made of transparent materials such as organic materials, glass, quartz, sapphire, or resin. After being installed on the step 2, it forms a cavity with the dam 1. The cavity formed by the first surface 101 and the light-transmitting cover 3 is filled with a medium 7 with a refractive index between 1.4 and 2.0. The material of the medium 7 is silicone resin or fluororesin, and of course it can also be one of silica gel, inert gas, fluoride, and grease. The purpose of setting the medium 7 is to make the light emitted by the light-emitting chip 5 refracted by the medium 7 first, and then refracted by air or other media, so as to avoid the light being directly refracted by the medium with a low refractive index, thereby improving the uniformity of the light, and at the same time protecting the light-emitting chip 5.

[0053] In order to test the influence of filling the medium 7 on the relationship, the light emitting element 1, the light emitting element 2 and the light emitting element 3 described in the first embodiment are arranged in the packaging structure one by one, and the light emitting effect is tested at a distance of 40 mm from the light emitting element. Then, silicone resin is filled into the cavity as the medium 7, and the light emitting effect is tested again at the same distance. The test results are shown in Table 2 below:

[0054] Table 2 Comparison of the light efficiency of bare die and filled medium

[0055]

[0056] In the above table, the first group, the second group, and the third group respectively represent that the light emitting element 1, the light emitting element 2, and the light emitting element 3 are placed in the packaging structure; the fourth group, the fifth group, and the sixth group respectively represent that the light emitting element 1, the light emitting element 2, and the light emitting element 3 are placed in the same packaging structure and filled with the medium 7. The first group and the fourth group are a group of control examples, the second group and the fifth group are a group of control examples, and the third group and the sixth group are a group of control examples.

[0057] In the above table, I represents current, the unit is ampere (A); U represents voltage, the unit is volt (V); represents luminous flux in milliwatts (mW); λp represents peak wavelength in nanometers (nm); FWHM represents half-wave width in nanometers (nm). Under constant current drive, the luminous efficiency of the fourth, fifth and sixth packaging structures filled with the medium 7 is increased by 100.13%, 85.91% and 101.45% respectively compared with the first, second and third packaging structures, and the luminous efficiency is increased by nearly 100% (i.e., 2 times). That is to say, after being filled with the medium 7, the dam 1 has a better reflection effect on the light-emitting component, and the luminous efficiency is significantly improved.

[0058] Of course, in this embodiment, a substrate (not shown in the figure) may be disposed on the side of the dam 1 away from the opening according to the actual manufacturing process or manufacturing target.

[0059] Embodiment 5

[0060] See also Figure 3 , this embodiment provides another packaging structure, which is arranged based on the dam 1 described in the third embodiment. In addition to the dam 1, it also includes a light-emitting element, a substrate 4, a step 2 formed on the top surface of the dam 1 and a light-transmitting cover 3. The light-emitting element described in this embodiment is a COB light source 6. The dam 1 receives the light emitted by the COB light source 6 and forms a reflection. The reflecting surface is a first surface 101, and the cross-sectional line of the first surface 101 along the thickness direction of the dam 1 is in a parabolic shape. Since the dam 1 has openings at both ends along its thickness direction, its cross-sectional line is a discontinuous parabola. The side with a smaller opening of the dam 1 is welded or bonded to the substrate 4, and the surface of the substrate 4 close to the dam 1 is the second surface 102, which is a plane. The COB light source 6 is arranged on the substrate 4 and is insulated from the dam 1 and the second surface 102. The substrate 4 is a silicon substrate, a plastic substrate or a ceramic substrate, and an electrode / lead is arranged on the side of the substrate 4 in contact with the COB light source 6 for powering the COB light source 6. Similarly, to improve light uniformity, the cavity formed by the first surface 101, the second surface 102 and the light-transmitting cover 3 is filled with a medium 7 with a refractive index between 1.4 and 2.0.

[0061] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A dam (1) for reflecting light, wherein the dam (1) is used to receive light emitted by a light-emitting element and form a reflection surface as a first surface (101), characterized in that: The cross-sectional line of the first surface (101) along the thickness direction of the dam (1) is parabolic, and the light-emitting component is arranged at a vertex away from the parabola opening; a step (2) is also formed on the side of the dam (1) away from the light-emitting component, and a light-transmitting cover (3) is mounted on the step (2).

2. The dam for reflecting light according to claim 1, characterized in that: The reflectivity of the first surface (101) to light in the ultraviolet band is greater than 80%.

3. The dam for reflecting light according to claim 2, characterized in that: The first surface (101) is provided with a polishing layer.

4. The dam for reflecting light according to claim 2, characterized in that: The first surface (101) is provided with a fine carving layer.

5. The dam for reflecting light according to claim 2, characterized in that: The first surface (101) is provided with a film coating layer or a metal coating layer.

6. The dam for reflecting light according to claim 1, characterized in that: The distance from the top of the first surface (101) to the bottom is H1, the distance from the top of the light-emitting element to the bottom of the first surface (101) is H2, and H1 ≥ H2; the radius of the opening of the dam (1) close to the bottom of the first surface (101) is R1, the radius of the opening of the dam (1) close to the top of the first surface (101) is R2, and R1 <R2。 7. The dam for reflecting light according to claim 6, characterized in that: 0.5mm≤R1≤6.0mm, 1.0mm≤R2≤8.0mm.

8. The dam for reflecting light according to claim 7, characterized in that: The R1 is greater than the maximum width of the light-emitting element projected along the thickness direction of the dam (1) and less than twice the maximum width of the light-emitting element projected along the thickness direction of the dam (1).

9. A packaging structure comprising the dam for reflecting light according to any one of claims 1 to 8, characterized in that: If the cross-sectional line of the first surface (101) along the thickness direction of the dam (1) is continuous, the light-emitting element is arranged on the first surface (101) away from the top surface of the parabolic opening and is insulated from the first surface (101); If the cross-sectional line of the first surface (101) along the thickness direction of the dam (1) is discontinuous, a substrate (4) is further included, the dam (1) is connected to the substrate (4) on a side close to the bottom of the first surface (101), the surface of the substrate (4) close to the dam (1) is the second surface (102), and the light-emitting element is arranged on the top surface of the second surface (102) and is insulated from the second surface (102); The light-emitting component is a light-emitting chip (5) or a COB light source (6).

10. The packaging structure according to claim 9, wherein: The cavity formed by the first surface (101) and the light-transmitting cover (3), or the cavity formed by the first surface (101), the second surface (102) and the light-transmitting cover (3) is filled with a medium (7) with a refractive index between 1.4 and 2.0.

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