Lens

Abstract

The invention relates to a lens which comprises a body and a first bubble, the body is provided with an incident plane and a light emitting plane, a bubble cavity is formed in the body, and the first bubble is located in the bubble cavity so that the first bubble can be located between the incident plane and the light emitting plane. In the design stage of the lens, the corresponding second design light-emitting efficiency can be obtained through design values of three parameters, namely the average particle size of the first bubbles, the volume ratio of the first bubbles in the lens and the minimum optical path between the incident plane and the light-emitting plane, and then the final light-emitting efficiency of the lens is predicted and evaluated through the second design light-emitting efficiency. Therefore, whether the light-emitting efficiency of the lens can meet the requirement or not can be judged in the design stage of the lens. And if the judgment result is not satisfied, relevant parameters can be adjusted or screened in the design stage of the lens.

Description

Technical Field

[0001] The present invention relates to the field of uniform light lamps, and particularly to a lens. Background Art

[0002] In the field of security, the requirements for the image quality of cameras in night vision environments are getting higher and higher. Correspondingly, higher requirements are also put forward for the light output uniformity of fill lights.

[0003] There is currently a fill light on the market, which includes a total internal reflection lens and a light source. The total internal reflection lens has an incident surface and an exit surface. The light source injects light into the total internal reflection lens at the incident surface and then exits from the exit surface, achieving a uniform light effect through the total internal reflection lens. In order to further improve the uniform light effect of the total internal reflection lens, some technicians have tried to prepare microbubbles inside the total internal reflection lens. The microbubbles are located between the incident surface and the exit surface. The microbubbles can reflect, refract, and scatter light, thereby increasing the light output uniformity and reducing glare.

[0004] However, in the above scheme, although the microbubbles improve the light output uniformity, they also significantly reduce the luminous efficiency and sometimes significantly change the light pattern, thus limiting the application scenarios of the above scheme. Summary of the Invention

[0005] Based on this, in view of the problem that microbubbles significantly reduce the luminous efficiency, it is necessary to provide a lens.

[0006] A lens, comprising a body and a first bubble. The body has an incident surface and an exit surface. A bubble cavity is provided inside the body, and the first bubble is located inside the bubble cavity so that the first bubble is located between the incident surface and the exit surface;

[0007] The average particle size of the first bubble is D1, with the unit of μm. The volume ratio of the first bubble in the lens is V1. The minimum optical path between the incident surface and the exit surface is L1, with the unit of mm;

[0008] The first designed light output efficiency Q1 of the lens = a1 + b1L1 + m1D1 + n1V1;

[0009] The first edge light loss coefficient of the lens ;

[0010] The second designed light output efficiency Q1' of the lens = Q1×(1 - t1);

[0011] Among them, 0.977201 ≤ a1 ≤ 0.996632, -0.014553 ≤ b1 ≤ -0.012147, -0.000024 ≤ m1 ≤ 0.000067, -0.11628 ≤ n1 ≤ 0.01672;

[0012] The lens satisfies: Q1’ ≥ 80%.

[0013] In one embodiment, the bubble cavity is only filled with the first bubble, satisfying: V1 ≤ 12.8%.

[0014] In one embodiment, it satisfies: V1 ≥ 8.5%, 300 ≥ D1 ≥ 200.

[0015] In one embodiment, the lens further includes a second bubble, the second bubble is located in the bubble cavity, and the average particle size of the second bubble is D2, where D2 < D1.

[0016] In one embodiment, the first bubble is located in the middle of the bubble cavity, and the second bubble is located at the side wall of the bubble cavity, so that the second bubble forms a reflective film.

[0017] In one embodiment, the unit of the average particle size D2 of the second bubble is μm, the volume ratio of the second bubble in the lens is V2, and the minimum optical path at the reflective film is L2, with the unit of mm;

[0018] The third designed light output efficiency Q2 of the lens is Q2 = a2 + b2L2 + m2D2 + n2V2, where 0.563139 ≤ a2 ≤ 0.631536, -0.346568 ≤ b2 ≤ -0.282113, 0.071101 ≤ m2 ≤ 0.077943, -4.421848 ≤ n2 ≤ -3.945379;

[0019] The lens satisfies: Q2 ≤ 50%.

[0020] In one embodiment, the second edge light loss coefficient of the lens is t2, the third edge light loss coefficient of the lens is t3, and the fourth designed light output efficiency of the lens is Q3;

[0021] The lens satisfies: t3 = t1 + (1 - V1) × t2; Q3 = Q1’ + (1 - Q2) × t3; and Q3 ≥ 90%.

[0022] In one embodiment, the lens satisfies: Q1 ≥ 90%.

[0023] In one embodiment, the lens satisfies: 100 ≤ D1 ≤ 200, 4% ≤ V1 ≤ 9%, 5 ≤ L1 ≤ 6, 1 ≤ D2 ≤ 5, 5% ≤ V2 ≤ 12%, 0.5 ≤ L2 ≤ 1, t2 ≥ 3%.

[0024] In one embodiment, the second bubble is mixed with the first bubble.

[0025] The beneficial effects of the present invention are as follows:

[0026] Through simulation and actual tests, the present invention discovers the endogenous relationship between the average particle size D1 of the first bubble, the volume ratio V1 of the first bubble in the lens, and the minimum optical path L1 between the incident surface and the light-emitting surface, and based on this endogenous relationship, proposes the parameter of the second designed light-emitting efficiency Q1' and its calculation formula. Among them, the second designed light-emitting efficiency Q1' can well match the final actual light-emitting efficiency of the lens.

[0027] In the design stage of the lens, the corresponding second designed light-emitting efficiency can be obtained through the design values of the average particle size of the first bubble, the volume ratio of the first bubble in the lens, and the minimum optical path between the incident surface and the light-emitting surface. Then, the final light-emitting efficiency of the lens can be predicted and evaluated through the second designed light-emitting efficiency, so as to determine whether the light-emitting efficiency of the lens can meet the requirements in the design stage of the lens. If the judgment result is not satisfied, the relevant parameters can be adjusted or screened in the design stage of the lens.

[0028] On the basis of the light homogenization effect of the first bubble on the lens, by reasonably designing the three values of D1, V1, and L1, ensuring that the final Q1' ≥ 80%, the adverse effects of the first bubble on the light-emitting efficiency can be effectively limited, and then the final actual light-emitting efficiency of the lens can be ensured to meet the usage requirements. Description of the Drawings

[0029] Figure 1 It is a front view structural schematic diagram of a lens in the prior art;

[0030] Figure 2 It is a front view structural schematic diagram of the lens in Embodiment 1 of the present invention;

[0031] Figure 3 It is a front view structural schematic diagram of the lens in Embodiment 2 of the present invention.

[0032] Reference Signs:

[0033] 1. Body; 11. Incident surface; 12. Light-emitting surface; 13. Bubble cavity; 14. Reflective surface; 2. First bubble; 3. Second bubble. Detailed Embodiments

[0034] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0036] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below", and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0039] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0040] Prior art:

[0041] See Figure 1 , the lens includes a body 1, and the shape of the body 1 is approximately frustum-shaped. The body 1 has an incident surface 11, an outgoing light surface 12 and a reflecting surface 14. The incident surface 11, the outgoing light surface 12 and the reflecting surface 14 are all outer wall surfaces of the body 1, and the reflecting surface 14 is located between the edge of the incident surface 11 and the edge of the outgoing light surface 12.

[0042] The light source is disposed at the incident surface 11. Among them, the light rays incident at a small angle can directly reach the outgoing light surface 12 for light output. The light rays incident at a large angle at the incident surface 11 first reach the reflecting surface 14. Among them, a part of the light rays will transmit through the body 1 from the reflecting surface 14, and the remaining light rays will be reflected to the outgoing light surface 12 and then output light.

[0043] The lens has a corresponding K value and a second edge light loss coefficient t2.

[0044] The K value is the ratio of the central light intensity I0 at the outgoing light surface 12 to the total light flux of the lens, which reflects the light pattern of the light rays at the outgoing light surface 12. In the prior art and subsequent embodiments provided by the present invention, the light flux of the lens is 23.02 lm.

[0045] The second edge light loss coefficient t2 can be obtained through numerical simulation. Among them, the light output efficiency at the outgoing light surface 12 when the total reflection film is not provided at the reflecting surface 14 is q1, and the light output efficiency at the outgoing light surface 12 when the total reflection film is provided at the reflecting surface 14 is q2, and t2 = q2 - q1. Usually, t2 ≥ 3%. In the prior art and subsequent embodiments provided by the present invention, t2 = 3.81%.

[0046] Embodiment 1:

[0047] See Figure 2 , this embodiment provides a lens, including a body 1 and a first air bubble 2.

[0048] Consistent with the prior art, the body 1 has an incident surface 11, a light-emitting surface 12, and a reflecting surface 14. The incident surface 11, the light-emitting surface 12, and the reflecting surface 14 are all outer wall surfaces of the body 1. The reflecting surface 14 is located between the edge of the incident surface 11 and the edge of the light-emitting surface 12.

[0049] A bubble cavity 13 is provided inside the body 1, and the bubble cavity 13 is close to the middle position inside the body 1. The bubble cavity 13 is a closed cavity and will not communicate with the outer wall surface of the body 1. The first bubble 2 is filled in the bubble cavity 13 so that the first bubble 2 can be located between the incident surface 11 and the light-emitting surface 12. Correspondingly, the light in the body 1 will pass through the first bubble 2 and be reflected, scattered, refracted, etc. by the first bubble 2 before exiting from the light-emitting surface 12, and finally the light uniformity at the light-emitting surface 12 is improved. In other words, the first bubble 2 can reduce the glare effect at the light-emitting surface 12.

[0050] Among them, the average particle size of the first bubble 2 is D1, with the unit of μm, the volume ratio of the first bubble 2 in the lens is V1, and the minimum optical path between the incident surface 11 and the light-emitting surface 12 is L1, with the unit of mm. The light-emitting efficiency Q actually detected at the light-emitting surface 12 实际 .

[0051] For the case where the first bubble 2 is provided inside the body 1, this embodiment proposes three concepts: the first designed light-emitting efficiency Q1, the first edge light loss coefficient t1, and the second designed light-emitting efficiency Q1'.

[0052] Among them, ; Q1 = a1 + b1L1 + m1D1 + n1V1, 0.977201 ≤ a1 ≤ 0.996632, -0.014553 ≤ b1 ≤ -0.012147, -0.000024 ≤ m1 ≤ 0.000067, -0.11628 ≤ n1 ≤ 0.01672; Q1' = Q1 × (1 - t1).

[0053] Actual tests are carried out on lenses with different values of multiple D1, V1, and L1, and the test results and related parameters are shown in Table 1.

[0054] Table 1

[0055]

[0056] Among them, when calculating Q1, a1 = 0.986917, b1 = -0.01335, m1 = 0.000021, n1 = -0.049779. The meaning of the K value retention rate is the ratio between the K value of the lens containing the first bubble 2 and the K value of the lens in the prior art that does not contain the first bubble 2 under the same luminous flux. The closer the K value is to 100%, the better the light pattern is maintained at the light exit surface 12, and the less the first bubble 2 changes the light pattern.

[0057] Based on Table 1, it can be found that for any one of the five lenses given in this embodiment, Q1' and Q 实际 are almost equal. From this, it can be proved that at the lens design stage, Q1' can be calculated through L1, D1, and V1, and then Q 实际 can be predicted by using Q1', so as to pre-judge Q 实际 at the lens design stage whether it meets the actual requirements. If the prediction result of Q 实际 does not meet the usage requirements, then L1, D1, and V1 can be adjusted or screened in advance to ensure that there is no large deviation between the actual light output efficiency of the final lens product containing the first bubble 2 and the actual light output efficiency of the lens in the prior art that does not contain the first bubble 2. In other words, by reasonably designing L1, D1, and V1, the adverse effect of the first bubble 2 on the light output efficiency can be suppressed.

[0058] Further referring to Table 1, it can be seen that when V1 = 40%, the actual light output efficiency (88.4%) at the light exit surface 12 does not decrease significantly compared with the prior art (91%), but the K value retention rate is only 68%, far lower than 80% and 81% (the K values of other lenses in Table 1). In other words, the light pattern at the light exit surface 12 is severely deformed at this time. On the other hand, for the lenses with sample numbers 1-4 in Table 1, although they have different D1 and V1 values, their K values are stably maintained within a very narrow range of 80%-81%. From this, it can be confirmed that only when the value of V1 is too large will it have an obvious adverse effect on the K value and the light pattern. Based on this analysis result, preferably, the lens should preferably satisfy V1 ≤ 12.8%.

[0059] More preferably, the lens can also satisfy V1 ≥ 8.5%, 300 ≥ D1 ≥ 200 to ensure that the light output uniformity is not less than 60%, so as to balance the K value and the light output uniformity.

[0060] Based on the analysis and test results of this embodiment, this embodiment further provides a design method for a lens containing the first bubble 2, which specifically includes the following steps:

[0061] Step 101: First, design a lens Lens0 (conventional optical design) that meets the target illuminance and target angle.

[0062] Step 102: Obtain the minimum optical path L1 between the incident surface 11 and the light-emitting surface 12 in the lens Lens0.

[0063] Step 103: According to the existing engineering technology level and requirements, the particle size value range of the first air bubble 2 is 50μm ≤ D1 ≤ 300μm, 0.01% ≤ V1 ≤ 50%; D1 is taken at intervals of 50μm, such as D1 = 50μm, 100μm, 150μm, 200μm, 250μm, 300μm. When V1 ≤ 1%, V1 is taken at intervals of 0.1%, such as V1 = 0.01%, 0.1%, 0.2%,..., 1%. When 5% ≥ V1 ≥ 1%, V1 is taken at intervals of 1%, such as V1 = 1%, 2%,..., 5%. When V1 ≥ 5%, V1 is taken at intervals of 5%, such as V1 = 5%, 10%,..., 50%.

[0064] Step 104: Use L1 and different combinations of D1 and V1 values to solve the first designed light-emitting efficiency Q1, the first edge light loss coefficient t1, and the second designed light-emitting efficiency Q1'. Screen out the Q1' with higher values from them, and lock the corresponding L1, D1, and V1 values according to the screening results.

[0065] Example 2:

[0066] See Figure 3 , the difference between this example and Example 1 is that the lens further includes a second air bubble 3, and the second air bubble 3 is also located in the air bubble cavity 13. The average particle size of the second air bubble 3 is D2, where D2 < D1. The second air bubble 3 can further improve the light-emitting uniformity at the light-emitting surface 12.

[0067] Furthermore, in this example, the first air bubble 2 is located in the middle of the air bubble cavity 13, and the second air bubble 3 is located at the side wall of the air bubble cavity 13. Thus, the second air bubble 3 can be used as a reflective film at the reflective surface 14, thereby improving the light-emitting efficiency at the light-emitting surface 12.

[0068] Among them, the volume ratio of the second air bubble 3 in the lens is V2, and the minimum optical path at the reflective film formed by the second air bubble 3 is L2, with the unit of mm.

[0069] Based on Example 1, this example further proposes the third designed light-emitting efficiency Q2, the third edge light loss coefficient t3, and the fourth designed light-emitting efficiency Q3.

[0070] Among them, Q2 = a2 + b2L2 + m2D2 + n2V2, where 0.563139 ≤ a2 ≤ 0.631536, -0.346568 ≤ b2 ≤ -0.282113, 0.071101 ≤ m2 ≤ 0.077943, -4.421848 ≤ n2 ≤ -3.945379; t3 = t1 + (1 - V1) × t2; Q3 = Q1’ + (1 - Q2) × t3.

[0071] In this embodiment, actual tests are carried out on lenses with different values of D1, V1, L1, D2, V2, and L2. The test results and related parameters are shown in Table 2. When calculating Q1, a1 = 0.986917, b1 = -0.01335, m1 = 0.000021, n1 = -0.049779; when calculating Q2, a2 = 0.597337241, b2 = -0.314340414, m2 = 0.074522069, n2 = -4.183613793; when calculating t3, t2 = 3.81%.

[0072] For the samples other than the prior art in Table 2, 100 ≤ D1 ≤ 200, 4% ≤ V1 ≤ 9%, 5 ≤ L1 ≤ 6, 1 ≤ D2 ≤ 5, 5% ≤ V2 ≤ 12%, 0.5 ≤ L2 ≤ 1, and Q2 ≤ 50%.

[0073] Table 2

[0074]

[0075] Based on Table 2, it can be found that for any lens provided in this embodiment that simultaneously includes the first bubble 2 and the second bubble 3, and the second bubble 3 forms a reflective film, there is a good matching degree between Q3 and Q 实际 and the difference between the two is very small. Therefore, in the lens design stage, Q3 can be obtained according to the design values of t2, D1, V1, L1, D2, V2, and L2, and Q3 can be used to predict the final actual light output efficiency Q 实际 of the lens. Then, it can be judged whether the actual light output efficiency of the final lens can meet the requirements. If not, at least one of D1, V1, L1, D2, V2, and L2 can be adjusted in time, so as to ensure that the lens provided in this embodiment that simultaneously includes the first bubble 2 and the second bubble 3 has a light output efficiency that does not decrease too significantly compared with the prior lens that does not include the first bubble 2 and the second bubble 3, and at least suppress the adverse effects of the first bubble 2 and the second bubble 3 on the light output efficiency of the lens.

[0076] Combined with Table 1 in Embodiment 1, and further comparing the lenses with sample numbers 6 - 12 in Table 2 with the lenses in the prior art, at least the following conclusions can be drawn:

[0077] First, through the mutual cooperation of the first air bubble 2 and the second air bubble 3, the light output efficiency of the lens not only does not decrease compared with the prior art, but is further improved. Among them, the addition of the second air bubble 3 not only does not further reduce the K-value retention rate of the lens, but instead improves the K-value retention rate. In other words, the addition of the second air bubble 3 can help maintain the light output pattern of the lens, which is contrary to the conventional expectation in the art.

[0078] Based on the analysis and test results of this embodiment, this embodiment further provides a design method for a lens that simultaneously includes the first air bubble 2 and the second air bubble 3, specifically including the following steps:

[0079] Step 201: First, design a lens Lens0 that meets the target illuminance and target angle (conventional optical design).

[0080] Step 202: Obtain the minimum optical path L1 and the second marginal light loss coefficient t2 between the incident surface 11 and the light output surface 12 in the lens Lens0.

[0081] Step 203: According to the existing engineering process level and requirements, the particle size of the first air bubble 2 has a value range of 50μm ≤ D1 ≤ 300μm, 0.01% ≤ V1 ≤ 50%, 1μm ≤ D2 ≤ 50μm, 1% ≤ V2 ≤ 25%, 0.5mm ≤ L2 ≤ 1mm;

[0082] D1 is taken at intervals of 50μm, such as D1 = 50μm, 100μm, 150μm, 200μm, 250μm, 300μm;

[0083] When V1 ≤ 1%, V1 is taken at intervals of 0.1%, such as V1 = 0.01%, 0.1%, 0.2%,..., 1%. When 5% ≥ V1 ≥ 1%, V1 is taken at intervals of 1%, such as V1 = 1%, 2%,..., 5%. When V1 ≥ 5%, V1 is taken at intervals of 5%, such as V1 = 5%, 10%,..., 50%;

[0084] D2 is taken at intervals of 10μm, such as D2 = 1μm, 10μm, 20μm, 30μm, 40μm, 50μm;

[0085] When V2 ≤ 5%, V2 is taken at intervals of 1%, such as V2 = 1%, 2%,..., 5%. When V2 ≥ 5%, V2 is taken at intervals of 5%, such as V2 = 10%, 15%, 20%, 25%;

[0086] L2 is taken at intervals of 0.1mm, such as L2 = 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm.

[0087] Step 204: Substitute t2, L1, and D1, V1, D2, V2, L2 with different numerical combinations into the foregoing formula and obtain Q3 corresponding to each numerical combination. Screen out Q3 with relatively high values from them, and lock the corresponding values of t2, L1, D1, V1, D2, V2, and L2 according to the screening results.

[0088] Embodiment 3:

[0089] The difference between this embodiment and Embodiment 1 is that the lens further includes a second bubble 3, and the second bubble 3 is also located in the bubble cavity 13. The first bubble 2 and the second bubble 3 are uniformly mixed in the bubble cavity 13. The average particle size of the second bubble 3 is D2, where D2 < D1. The second bubble 3 can further improve the light-emitting uniformity at the light-emitting surface 12.

[0090] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0091] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A lens, characterized in that, It includes a body (1) and a first air bubble (2). The body (1) has an incident surface (11) and an outgoing light surface (12). A bubble cavity (13) is provided inside the body (1), and the first air bubble (2) is located inside the bubble cavity (13) so that the first air bubble (2) is located between the incident surface (11) and the outgoing light surface (12). The average particle size of the first air bubble (2) is D1, with the unit of μm. The volume ratio of the first air bubble (2) in the lens is V1. The minimum optical path between the incident surface (11) and the outgoing light surface (12) is L1, with the unit of mm. The first designed light output efficiency Q1 of the lens = a1 + b1L1 + m1D1 + n1V1. The first edge light loss coefficient of the lens ; The second designed light output efficiency Q1' of the lens = Q1×(1 - t1). Where, 0.977201 ≤ a1 ≤ 0.996632, -0.014553 ≤ b1 ≤ -0.012147, -0.000024 ≤ m1 ≤ 0.000067, -0.11628 ≤ n1 ≤ 0.01672. The lens satisfies: Q1' ≥ 80%.

2. The lens according to claim 1, wherein Only the first air bubble (2) is filled in the bubble cavity (13), satisfying: V1 ≤ 12.8%.

3. The lens according to claim 2, characterized in that, Satisfying: V1 ≥ 8.5%, 300 ≥ D1 ≥ 200.

4. The lens according to claim 1, characterized in that, The lens further includes a second air bubble (3). The second air bubble (3) is located inside the bubble cavity (13). The average particle size of the second air bubble (3) is D2, where D2 < D1.

5. The lens according to claim 4, characterized in that, The first air bubble (2) is located in the middle of the bubble cavity (13), and the second air bubble (3) is located at the side wall of the bubble cavity (13) so that the second air bubble (3) forms a reflective film.

6. The lens according to claim 5, characterized in that, The average particle size D2 of the second air bubble (3) has the unit of μm. The volume ratio of the second air bubble (3) in the lens is V2. The minimum optical path at the reflective film is L2, with the unit of mm. The third designed light output efficiency Q2 of the lens = a2 + b2L2 + m2D2 + n2V2, where, 0.563139 ≤ a2 ≤ 0.631536, -0.346568 ≤ b2 ≤ -0.282113, 0.071101 ≤ m2 ≤ 0.077943, -4.421848 ≤ n2 ≤ -3.945379. The lens satisfies: Q2 ≤ 50%.

7. The lens according to claim 6, characterized in that, The second edge light loss coefficient of the lens is t2, the third edge light loss coefficient of the lens is t3, and the fourth designed light output efficiency of the lens is Q3. The lens satisfies: t3 = t1 + (1 - V1)×t2; Q3 = Q1' + (1 - Q2)×t3; and Q3 ≥ 90%.

8. The lens according to claim 7, wherein The lens satisfies: Q1 ≥ 90%.

9. The lens according to claim 7, wherein, The lens satisfies: 100 ≤ D1 ≤ 200, 4% ≤ V1 ≤ 9%, 5 ≤ L1 ≤ 6, 1 ≤ D2 ≤ 5, 5% ≤ V2 ≤ 12%, 0.5 ≤ L2 ≤ 1, t2 ≥ 3%.

10. The lens according to claim 4, characterized in that, The second air bubble (3) is mixed with the first air bubble (2).

Images