WO2020010748A1 - Thin film optical lens having microstructures, design method and lighting device - Google Patents

Abstract

A thin film optical lens that has microstructures, comprising: at least one lens unit (1), the lens unit (1) comprising a light incident surface and a light emergent surface, and the light incident surface being provided with: a first microstructure (11) that maintains the original propagation direction of light, a second microstructure (12) that controls the propagation direction of the light by means of refraction, and a third microstructure (13) that controls the propagation direction of the light by means of total internal reflection. The lens unit (1) controls the propagation path and the propagation direction of incident light by means of the first microstructure (11), second microstructure (12) and third microstructure (13).

Description

Thin-film optical lens with microstructure, design method and lighting device Technical field

The invention relates to the field of lighting technology, in particular to a thin-film optical lens having a microstructure, a design method and a lighting device.

Background technique

LED light sources have been widely used in the lighting field with many advantages. Among them, the secondary light distribution of optical lenses plays a key role. After the light emitted by the LED light-emitting chip passes through the secondary lens, it will be refracted or fully reflected according to the curvature of the secondary lens surface Reflection, due to the difference in the refractive index of light of different colors (frequency), will affect the uniformity of the light spot, and the light emitted from the LED light-emitting chip is more likely to form a "yellow spot" phenomenon when it is incident on the diffuser through a single-layer secondary lens.

Therefore, in order to meet the needs of lighting applications, secondary optics are usually used to control the optics at various angles emitted by LEDs in order to achieve the needs of uniform lighting or directional lighting. These secondary optics are usually LED lenses, reflectors or two Or both. Although these secondary optical elements can well control the light propagation path and direction, they also face many problems. For example: high cost; long time for design, processing, and development; the size of the secondary optical element is too large, which causes the size of the lamp to be too large. The current market needs cost-effective; slim and scalable modular design. Obviously, the current secondary optics cannot well meet the requirements of the development trend of the lighting market.

Summary of the invention

Without adding the thickness of the lamp, the weight of the lamp, and increasing the size of the lamp, how to control the propagation path and direction of LED light emission. The present application provides a thin-film optical lens with a microstructure, a design method, and a lighting device.

According to a first aspect, an embodiment provides a thin-film optical lens having a microstructure, including: at least one lens unit. The lens unit includes a light entrance surface and a light exit surface. The light entrance surface is provided with: A first microstructure, a second microstructure that controls the direction of light propagation through refraction, and a third microstructure that controls the direction of light propagation through total reflection;

The lens unit controls a propagation path and a propagation direction of the incident light through the first microstructure, the second microstructure, and the third microstructure.

In one embodiment, the first microstructure is a planar structure that controls the propagation of light in the original propagation direction, the second microstructure is a refractive tooth group that controls the refraction and propagation of light through a tooth structure, and the third microstructure is that the entire light is controlled by a tooth structure Group of total reflection teeth with reflection propagation.

In one embodiment, a distance between each adjacent refracting tooth of the refractive tooth group is larger than a distance between each adjacent total reflecting tooth of the total reflection tooth group.

In one embodiment, every two adjacent total reflection teeth in the total reflection teeth group are a group, and the outgoing light rays controlled by the total reflection teeth of each group intersect.

In one embodiment, the outgoing light rays controlled by the refractive tooth group intersect with the outgoing light rays controlled by the total reflection tooth group.

In one embodiment, the tooth height of each refractive tooth in the second microstructure is the same, and the inclination of the tooth angle is different.

In one embodiment, each of the total reflection teeth in the third microstructure has the same tooth height and different inclination of the tooth angle.

In one embodiment, the tooth heights in the second microstructure and the third microstructure are the same.

In one embodiment, the first microstructure is circular, the second microstructure is a ring-shaped refractive tooth group, and the third microstructure is a ring-shaped total reflection tooth group.

In one embodiment, the first microstructure, the second microstructure, and the third microstructure are concentric, and the first microstructure, the second microstructure, and the third microstructure are sequentially arranged from the inside to the outside.

In one embodiment, the first microstructure, the second microstructure, and the third microstructure are concentric, and the first microstructure, the third microstructure, and the second microstructure are sequentially arranged from the inside to the outside.

In one embodiment, the first microstructure is a long strip, the second microstructure is a strip-shaped refractive tooth group, and the third microstructure is a strip-shaped total reflection tooth group.

In one embodiment, the second microstructure and the third microstructure are symmetrically disposed on both sides of the first microstructure, respectively, and the second microstructure is located between the first microstructure and the third microstructure.

In one embodiment, the second microstructure and the third microstructure are symmetrically disposed on both sides of the first microstructure, respectively, and the third microstructure is located between the first microstructure and the second microstructure.

In an embodiment, the method further includes a diffusing section for diffusing the emitted light, and the diffusing section is disposed on the light emitting surface of the lens unit.

In one embodiment, the diffusion portion is a micron-sized lens display.

In one embodiment, the number of the lens units is multiple, and the multiple lens units are arranged according to a preset image, text, or track.

In one embodiment, the shape of the lens unit is a regular shape or an irregular shape.

In one embodiment, the thickness of the lens unit is 0.001 mm-0.5 mm.

In one embodiment, the lens unit is made of optical plastic.

According to a second aspect, a method for designing a thin-film optical lens with a microstructure is provided in this embodiment. The material of the thin-film optical lens is optical plastic, and a first surface for maintaining the original propagation direction of light is provided on the light incident surface of the optical plastic. The microstructure, a second microstructure that controls the direction of light propagation through refraction, and a third microstructure that controls the direction of light propagation through total reflection, and the specific design steps of the first microstructure, the second microstructure, and the third microstructure include :

Designing a first microstructure on the optical plastic according to an angle of a light distribution of a design target;

Calculate the Brewster angle based on the refractive index of the optical plastic;

Designing a second microstructure on the optical plastic in a region where the incident angle of light is smaller than the Brewster angle;

On the optical plastic, a third microstructure is designed in a region where the incident angle of light is greater than or equal to the Brewster angle.

In one embodiment, the first microstructure is a planar structure that controls the propagation of light in the original propagation direction, the second microstructure is a refractive tooth group that controls the refraction and propagation of light through a tooth structure, and the third microstructure is A total reflection tooth set that controls the total reflection propagation of light through the tooth structure.

In one embodiment, in the process of designing the third microstructure, the total reflection tooth group is designed such that every two adjacent total reflection teeth are a group, and the outgoing light rays controlled by the total reflection teeth of each group intersect.

In an embodiment, the method further includes a step of designing a micro-structured diffusing portion on the light emitting surface of the optical plastic, the diffusing portion is configured to diffuse the outgoing light.

According to a third aspect, an embodiment provides an illumination device including an LED lamp group, and further including the thin-film optical lens having a microstructure described above, and a light incident surface of the thin-film optical lens covers the LED lamp group so that the film The optical lens controls a propagation path and a propagation direction of light emitted by the LED lamp group through the first microstructure, the second microstructure, and the third microstructure.

In one embodiment, the thin-film optical lens is formed by splicing a plurality of the lens units, and a single lens unit correspondingly covers at least one LED light-emitting body.

In one embodiment, the thin film optical lens is only a single lens unit, and the lens unit covers the LED lamp group.

According to the thin film optical lens according to the above embodiment, since the first microstructure, the second microstructure, and the third microstructure of the micrometer are used to accurately control the propagation path and direction of incident light at various angles, when the thin film optical lens is applied After the LED lighting device, the thin-film optical lens realizes the redistribution of the light energy emitted by the LED in space, thereby meeting the requirements of various lighting applications. In addition, the thin-film optical lens is very thin, and its thickness can reach a thickness of 0.03mm. And its shape can be cut according to the structure of the actual lamp. Therefore, the application of the thin film optical lens can make the shape of the LED lamp more slim and beautiful, make the LED lamp lighter, and it is also conducive to the production of various In order to achieve the purpose of greatly reducing the cost of lamps, this thin film optical lens can just solve the problems of the current lighting market in pursuit of slim, beautiful shapes, and personalized lamps.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a partially enlarged view of a lens unit;

Figure 2 is a side view of the lens unit;

3 is a schematic diagram of a first microstructure design;

4 is a schematic diagram of a second microstructure design;

5 is a schematic diagram of a third microstructure design;

6 is a partially enlarged schematic diagram of a second microstructured optical path;

7 is a partially enlarged schematic diagram of a third microstructured optical path;

8 is a schematic diagram of a third microstructure controlling the propagation of incident light;

FIG. 9 is a partially enlarged schematic diagram of the intersection of light emitted by the third microstructure;

10 is a schematic diagram of a thin film optical lens controlling the propagation of incident light;

FIG. 11 is a schematic diagram of light distribution simulation when a thin film optical lens is misassembled;

12 is a schematic diagram of a light distribution simulation of a thin film optical lens during another misassembly;

FIG. 13 is a schematic view showing a structure of a thin-film optical lens as a gyro;

14 is a schematic view of a thin film optical lens having a stripe structure;

15 is a schematic view of splicing of three lens units;

16 is a schematic view of splicing of four lens units;

17 is a schematic view of splicing of six lens units;

FIG. 18 is a schematic diagram of splicing of more lens units; FIG.

19 is a schematic diagram of splicing of more lens units;

20 is a light-emitting effect diagram of FIG. 19;

FIG. 21 is a schematic diagram of splicing of more lens units; FIG.

22 is a light-emitting effect diagram of FIG. 21;

23 to 27 are schematic diagrams of different splicing shapes of the thin film optical lens;

FIG. 28 is a schematic view of a thin film optical lens with a dual microstructure; FIG.

FIG. 29 is a light-emitting effect diagram of a thin film optical lens with a dual microstructure.

detailed description

The present invention will be further described in detail below through specific embodiments in combination with the accompanying drawings.

In the embodiment of the present invention, by designing a micro-structured thin-film optical lens, the micro-structure is used to control the propagation path and direction of incident light, so that the light emitted through the thin-film optical lens is uniform, and the spot chromatic aberration and uneven spot are resolved. And other issues.

Embodiment one:

This example provides a thin-film optical lens with a microstructure, including at least one lens unit 1. The lens unit 1 includes a light entrance surface and a light exit surface. In order to control the propagation path and direction of incident light, this example uses the light entrance surface of the lens unit 1. The microstructure is designed. Specifically, the light incident surface is provided with a first microstructure 11 that maintains the original propagation direction of light, a second microstructure 12 that controls the direction of light propagation through refraction, and a third that controls the direction of light propagation through total reflection. Microstructure 13.

Because the first microstructure 11 maintains the original propagation direction of the light, that is, the first microstructure 11 does not change the propagation path and propagation direction of the incident light, and according to the distribution of the light emission angle of each incident light in the light emission interval, because The light intensity of the center position of the light emission section of the incident light is the strongest, and the light intensity of the outgoing light at the position is correspondingly the strongest, and the light emission angle of the incident light gradually expands outward from the center position. Therefore, the first micro The structure 11 is located at the center of the light emitting interval of the incident light, and the second microstructure 12 and the third microstructure 13 are arranged outside the first microstructure 11 according to the actual situation, so that the second microstructure 12 and the third microstructure 13 are paired. The propagation path and propagation direction of the incident light other than the center position of the light emitting section are controlled. Finally, when the incident light passes through the light incident surface of the lens unit 1, it passes through the first microstructure 11, the second microstructure 12, and the third microstructure. The structure 13 changes the propagation path and the propagation direction of the incident light so that the light exit surface of the lens unit 1 can emit mixed light, so that the light emitted by the lens unit 1 has a spot and colorless Poor and uniform spot effect.

It should be noted that the material of the lens unit 1 of this example is optical plastic of the lens, and its thickness ranges from 0.001mm to 0.5mm, that is, the lens unit 1 of this example can be made very thin, for example, it can be done Lens unit with a thickness of 0.003mm.

Embodiment two:

Based on the first embodiment, the design and arrangement of the first microstructure 11, the second microstructure 12, and the third microstructure 13 are described in detail in this example.

A structural diagram of the lens unit 1 is shown in Figs. 1 and 2. The first microstructure 11 is a planar structure that controls the propagation of light in the original propagation direction, and the second microstructure 12 is a refractive tooth that controls the refraction and propagation of light through a tooth structure. Group 121, the third microstructure 13 is a total reflection tooth group 131 that controls the total reflection propagation of light through a tooth structure, wherein the first microstructure 11 is located at the center of the incident light emitting section, and the second microstructure 12 is close to the first microstructure. The structures 11 are arranged, and the third microstructure 13 is arranged next to the second microstructure 12.

Among them, the distance between the adjacent refractive teeth of the refractive tooth group is greater than the distance between the adjacent total reflection teeth of the total reflection tooth group. Therefore, from the perspective of the overall structure of the lens unit 1, the refractive tooth group is relatively For the reflection tooth group, the refractive tooth group is relatively sparsely arranged, while the total reflection tooth group is relatively densely arranged.

The planar interval design of the first microstructure 11 is shown in FIG. 3. The platform length of the first microstructure 11 has the following formula for the opening angle θ1 of the emission center of the incident light (taking this incident light as the light emitted by LED2 as an example). Out.

The target light distribution of the thin film lens is given by the following formula:

I (θ) = I ₀ COS ⁿ (θ);

Among them, I ₀ is the corresponding light intensity when the angle is zero, n is a power function index of the light distribution, n = 1 means that the light distribution is Lambertian, and n = 0 means that the light is uniformly distributed.

θ1 = θ3 + (θ3 / 2) +/- △ θ1;

Wherein, the angle theta] 3 light distribution design goals, i.e. I _0/2 corresponding to the angle;

Δθ1 is the fluctuation range of the emitted light at the first microstructure 11 and its value is given by the following formula:

Δθ1 = θ3 / 2 * 10%.

The design of the second microstructure 12 is shown in FIG. 4. After the light is emitted by the LED2 and passes through the second microstructure 12, it is refracted according to Snell's refraction law, thereby controlling the light exit angle θ2. The formula is as follows:

θ2 = θ1- △ θ2;

Among them, Δθ2 is the fluctuation range of the emitted light at the first microstructure 11 and its value is given by the following formula:

Δθ1 = θ3 / 2 * 10%.

The design of the third microstructure 13 is shown in FIG. 5. The light is emitted by LED2, deflected through the inclined plane, and then incident on the next adjacent inclined plane. The light is totally reflected on this inclined plane, and then exits at a specific design angle θ5.

The first microstructure 11, the second microstructure 12, and the third microstructure 13 in this example are designed based on Fresnel's reflection law. Specifically, the analysis of the Fresnel reflection formula below does not consider the absorption of optical materials In the case of the system, the optical efficiency of the optical material T = 1- (rp + rs) / 2 decreases with the increase of the incident angle, especially when the incident angle is greater than the Brewster angle θB, its optical efficiency decreases sharply.

θB = atan (n1 / n2);

Where n1 is the refractive index of the incident light, n2 is the refractive index of the outgoing light, θ1 is the incident angle, θ2 is the exit angle, rs is the reflectance of the s light, and rp is the reflectance of the p light.

Therefore, in order to make the thin-film optical lens obtain a more ideal system efficiency, when the incident angle of the light is smaller than the Brewster angle, the thin-film optical lens precisely controls the light by the refraction feature, that is, the incident angle of the light is less than the Brewster The angle of the light propagation path and direction is controlled by the first microstructure 11 and the second microstructure 12; when the incident angle of the light is greater than or equal to the Brewster angle, the thin film optical lens uses the total reflection feature to precisely control the light, that is, The third microstructure 13 controls the propagation path and direction of the light whose incident angle is greater than or equal to Brewster's angle.

For example, the thin film optical lens material is plastic and its refractive index is 1.49.

According to the calculation, the Brewster θB = 56.13 °

When the incident angle θi is less than 56.13 degrees, the propagation path and direction of the light are controlled by the second microstructure 12, that is, the light is refracted by the first inclined surface, and then refracted by a plane, and then passes through The two controls facing the light, and finally emit according to the designed target angle, as shown in Figure 6.

When the above incident angle θi is greater than or equal to 56.13 degrees, the propagation path and direction of light are controlled by the third microstructure 13, that is, the light is refracted by the first inclined surface, and then passes through the second inclined surface The light is totally reflected, and then refracts the light after passing through a plane, and then is controlled by three optical surfaces to finally emit light according to the designed target angle, as shown in FIG. 7.

In addition, when the microstructure lens unit 1 is actually installed, due to the error between the lens unit 1 and the assembly position, this position error often causes the final light distribution to be inconsistent with the design, or the light distribution between products is different, and the quality cannot be Control. To solve this problem, the specific design of the third microstructure 13 in this example is characterized in that every two adjacent total reflection teeth in the total reflection tooth group are a group, and the outgoing rays controlled by the total reflection teeth of each group intersect That is, the outgoing light rays controlled by two total reflection teeth adjacent to the third microstructure 13 intersect.

As shown in FIG. 8, the total reflection teeth N1 in the third microstructure 13 control the light to emit RAY1 upward, and the total reflection teeth N2 in the third microstructure 13 control the light to emit RAY2 downward, and RAY1 and RAY2 intersect. When the third microstructure 13 is designed with the total reflection teeth N1 and the total reflection teeth N2 alternately adjacent, the third microstructure 13 controls the emitted light to alternately intersect. This structure can solve the problem of inconsistent light distribution caused by the assembly position error of the thin film optical lens. .

Specifically, the angle θray where the rays of RAY1 and RAY2 intersect is given by the following formula:

θray = atan (ΔL / L);

Among them, L is the distance from the LED light emitting surface to the thin film optical lens, and ΔL is the assembly error of the thin film optical lens. In this way, when the position deviation of the thin film optical lens relative to the LED light emitting surface is within ΔL, its light distribution angle and light shape will not change much. In this way, inconsistent light distribution results and designs caused by mechanical structure processing and assembly errors during the actual lens assembly process, as well as industry problems of inconsistent quality between products.

In the following, specific examples of the third microstructure 13 controlling the emitted light to alternately intersect will be described.

The distance between the designed lens and the LED is 1m, and the lens assembly error is 0.2mm. Use on a medium angle spotlight fixture.

θray = atan (ΔL / L) = atan (0.2 / 1) = 11.3 °;

As shown in Figure 9, the corresponding angle of two adjacent rays is θi1 = 41.3 ° θi2 = 40.9 °. When the light passes through a total reflection tooth, the total reflection occurs. The angle between the inclined surface of the total reflection tooth and the horizontal line is θa1 = 26.9 °. As soon as the light passes through the plane, it exits downward; the second light passes through the adjacent total reflection tooth 2 to undergo total reflection. The angle of the horizontal line of the total reflection tooth slope is θa2 = 30.5. After the light passes through the plane, it exits upward. The angle formed by the intersection of the two final beams of light one and light two with each other is 11.3 °.

On the basis of the intersection of the outgoing light rays controlled by the third microstructure 13, in order to further improve the uniform light distribution of the thin film optical lens, it is also possible to design that the outgoing light rays controlled by the second microstructure 12 and the third microstructure 13 also intersect, that is, The outgoing light rays controlled by the refraction tooth group intersect with the outgoing light rays controlled by the total reflection tooth group, as shown in FIG. 10.

It should be noted that the tooth height of each refractive tooth in the second microstructure 12 in this example is the same, and the inclination of the tooth angle is different. Similarly, the tooth height of each total reflection tooth in the third microstructure 13 is the same. The inclination of the angles is different, and the tooth heights in the second microstructure 12 and the third microstructure 13 are the same. Through the same height of each tooth in the second microstructure 12 and the third microstructure 13, the uniform light output of the thin film optical lens is achieved. distributed.

Through the above design, the simulation results of the thin-film optical lens with microstructure in actual application are shown in Figure 11 and Figure 12, and the schematic diagram of the light distribution angle of 43 degrees when the lens is 0.9mm away from the LED is shown in Figure 11; When the lens is 1.1mm away from the LED, the schematic diagram of the light distribution angle of 42.8 degrees is shown in Figure 12; as shown in Figures 11 and 12, although there is a position deviation, the light distribution angles of the two positions are very close, The difference is only 0.2 degrees, and the light shapes of the light distribution are very similar, and they are all smooth drop shapes. Therefore, the design of the microstructure of the thin film optical lens of this example solves the problem caused by mechanical structure processing and assembly errors during the actual lens assembly process. Industry problems with inconsistent light results and designs, and inconsistent quality between products.

Example three:

Based on the second embodiment, the shape and structure of the lens unit 1 and the internal microstructure arrangement are described in this example.

In this example, the first microstructure 11 is circular, the second microstructure 12 is a ring-shaped refractive tooth group, the third microstructure 13 is a ring-shaped total reflection tooth group, the first microstructure 11, the second microstructure 12 and the third microstructure are The internal arrangement of the structure 13 is: the first microstructure 11, the second microstructure 12, and the third microstructure 13 are concentric, and the first microstructure 11, the second microstructure 12, and the third microstructure 13 are from the inside to the outside. Arranged sequentially, under such an arrangement, the lens unit 1 of this example can be manufactured into an axisymmetric convolute structure, as shown in FIG. 13.

In other embodiments, based on the concentricity of the first microstructure 11, the second microstructure 12, and the third microstructure 13, the first microstructure 11, the third microstructure 13, and the second microstructure 12 may be composed of They are arranged in order from inside to outside, that is, the second microstructures 12 are arranged on the outermost side.

Embodiment 4:

Based on the third embodiment, the first microstructure 11, the second microstructure 12, and the third microstructure 13 may be deformed. For example, the first microstructure 11 is an elongated bar, and the second microstructure 12 is a bar. Refraction tooth group, the third microstructure 13 is a bar-shaped total reflection tooth group. The arrangement between the three is: the second microstructure 12 and the third microstructure 13 are symmetrically disposed on both sides of the first microstructure 11 respectively. Moreover, the second microstructure 12 is located between the first microstructure 11 and the third microstructure 13, as shown in FIG. 14.

In other embodiments, the first microstructure 11, the second microstructure 12, and the third microstructure 13 in this example may also be arranged as follows: the second microstructure 12 and the third microstructure 13 are symmetrically disposed at the first Two sides of a microstructure 11, and the third microstructure 13 is located between the first microstructure 11 and the second microstructure 12. That is, the second microstructures 12 are arranged on the outermost side.

Embodiment 5:

It should be noted in this example that the thin-film optical lens of the present application may have only a single lens unit 1 or multiple lens units 1. When there are multiple lens units 1, the multiple lens units 1 may be The arrangement of images, characters, or tracks is set. Correspondingly, in the process of stitching, the shape of the lens unit 1 in this example may be a regular shape or an irregular shape.

For example, the lens unit 1 of this example may be a linear structure, a circular structure, or a triangular structure, a quadrangular structure, a pentagonal structure, a hexagonal structure, etc., and lenses of different shapes may be used according to the actual application. Unit 1 is spliced to form thin-film optical lenses of different shapes, as shown in FIG. 15, and the shape of the thin-film optical lenses of three triangular lens units 1 is spliced, as shown in FIG. 16, and the thin-film optical lenses of four triangular lens units 1 are spliced. The lens shape is, as shown in FIG. 17, a shape of a thin film optical lens in which six triangular lens units 1 are spliced, and as shown in FIG. 18, a shape of a thin film optical lens in which more triangular lens units 1 are spliced.

By splicing different numbers of lens units 1, the uniform effect of the thin-film optical lens controlling light emission is different, as shown in Fig. 19, the effect of controlling the light emission of the thin-film optical lens is shown in Fig. 20, and the effect of controlling the light-emitting of the thin-film optical lens, as shown in Fig. 21 The effect is shown in FIG. 22. By comparing FIG. 20 and FIG. 22, it can be seen that the effect of the thin film optical lens of FIG. 21 on controlling light emission is better than that of the thin film optical lens of FIG. 19.

In other real examples, different shapes of the lens unit 1 can be used to splice thin film optical lenses of different shapes according to the actual application. The schematic diagram of the splicing of the thin film optical lens is shown in Figures 23-27.

Embodiment 6:

Based on the first embodiment to the fifth embodiment, in order to make the light emitted by the LED 2 pass through the lens unit 1 more uniform in illuminance and color, this example further includes a diffusion portion 3 for diffusing the outgoing light, that is, Add a micron-sized lens array to the light-emitting surface (not facing the LED surface) of the lens unit 1. The microstructure thickness of the lens array does not exceed 0.02mm. As shown in Figure 28, the light of LED2 passes through the light-incident surface of the thin-film lens. Then, the microstructures incident on the light emitting surface with the microstructure diffusion part 3 in a certain direction, so that the light with a relatively directional light will diffuse along the previous direction at a certain angle to the surroundings.

As shown in FIG. 29, by adding a diffusion portion 3 having a microstructure to the light-emitting surface of the thin-film optical lens, it can be seen that both the uniformity of illumination and the uniformity of color are significantly improved. Generally, the larger the angle diffusion, the better the brightness and color uniformity of the light spot; the microstructure curvature size of the required diffusion angle can be designed according to the needs of practical applications.

Embodiment 7:

This example provides a method for designing the thin-film optical lens according to the first to sixth embodiments. The material of the thin-film optical lens is optical plastic, and a first microstructure that maintains the original propagation direction of light is provided on the light incident surface of the optical plastic. 2. Set a second microstructure that controls the direction of light propagation through refraction and a third microstructure that controls the direction of light propagation through total reflection. The specific design steps of the first microstructure, the second microstructure, and the third microstructure include:

1) Design the first microstructure on the optical plastic according to the angle of the light distribution of the design target;

The designed first microstructure is a planar structure that controls the propagation of light in the original propagation direction. For the range design of the first microstructure, please refer to the second embodiment, which is not described in this example.

2) Calculate the Brewster angle based on the refractive index of the optical plastic;

3) On the optical plastic, design the second microstructure in the area where the incident angle of the light is smaller than the Brewster angle;

4) On the optical plastic, design a third microstructure in a region where the incident angle of the light is greater than or equal to the Brewster angle.

The second microstructure is a refraction tooth group that controls the refraction and propagation of light through a tooth structure, and the third microstructure is a total reflection tooth group that controls the total reflection and propagation of light through a tooth structure.

Preferably, when designing the third microstructure, the total reflection tooth group of the third microstructure is designed such that every two adjacent total reflection teeth are a group, and the outgoing light rays controlled by the total reflection teeth of each group intersect and pass through the exit The light rays alternately intersect one another to solve the industry problems of inconsistent light distribution results and designs caused by assembly errors when using thin-film optical lenses, and inconsistent quality between products. For details of the specific design of the second microstructure and the third microstructure in this example, please refer to the second embodiment, which is not described in this example.

Further, this example further includes a step of designing a microstructure and a diffusing portion on the light-emitting surface of the optical plastic, and the diffusing portion is used to diffuse the outgoing light.

This example provides the basic idea of designing a thin-film optical lens with a microstructure. The microstructure is used to change the light propagation path and direction. For the specific structure and shape of the designed thin-film optical lens, please refer to Examples 1 to 6. Examples are not repeated.

Embodiment 8:

Based on the first embodiment to the sixth embodiment, this example provides a lighting device using the thin film optical lens of the present application. The lighting device includes an LED lamp group, and also includes a thin film optical lens having a microstructure according to the present application. The thin film optical of this example For the detailed description of the lens, please refer to the first embodiment to the sixth embodiment, which will not be described in detail in this example. When the thin film optical lens is used specifically, the light incident surface of the thin film optical lens covers the LED lamp group, so that the thin film optical lens passes the first micro lens. The structure, the second microstructure and the third microstructure control the propagation path and the propagation direction of the LED light group.

In specific applications, thin-film optical lenses can be composed of multiple lens units, and the number of lens units corresponds to the number of LED light emitters in the LED lamp group, so that a single lens unit corresponds to a single LED light emitter; in other truths In the example, the number of lens units may also be less than the number of LED light emitters, so that a single lens unit correspondingly covers two or three or more LED light emitters. In other embodiments, the thin film optical lens may be only a single The lens unit, the lens unit covers the LED lamp group.

The thin film optical lens of the present application has the following advantages in the application of a lighting device:

1. The microstructure of the micro-structured thin-film optical lens is very thin. For example, it can be only 0.02 mm thick, and the thinnest existing lens is 10 mm, which can greatly save the materials used for the secondary optical lens.

2.Using this ultra-thin micro-structured film optical lens can make the lamp very thin. For example, when it is used in LED spotlights, if the existing ordinary solution is used, the thinnest lamp can only be 20mm thick, and The thinnest lamp using the micro-structured thin film optical lens solution of the present invention can be 3 mm, which not only makes the lamp very thin, but also greatly reduces the materials used in the lamp. It really solves the most difficult problem in the lighting industry: saving materials, reducing costs, avant-garde and beautiful appearance design.

3. This micro-structured thin-film optical lens can be deformed to achieve different light spot distributions, such as linear, triangular, quadrangular, pentagonal lights and other irregular light spots.

4. This micro-structured thin-film optical lens can be designed to have a tooth-shaped scale structure. The scale structure can achieve the function of mixing light. After the light emitted by the LED is controlled by the thin-film optical lens, its illumination spot is more uniform and the color distribution is more consistent. .

5. This micro-structured thin-film optical lens can be designed as a double-sided micro-structure, and the micro-structured surface close to the LED is to precisely control the light exit direction; the micro-structured surface far from the LED is to diffuse the light at a certain angle along the main light-emitting direction . So as to reach the angle design of light distribution, while taking into account the high-quality spot brightness and color uniformity.

6. The micro-structured thin-film optical lens can also be compactly spliced as an independent unit, which can not only arrange more LEDs in a limited space than the existing solution, but also increase the arrangement of LED particles by about 20%. Not only that, because the LEDs are evenly distributed, it is conducive to the uniform heat distribution of the LEDs, providing the heat dissipation capability of the lamps, improving the reliability of the LED lamps and extending the service life.

7. The stitching arrangement of this microstructure lens unit can also be stitched and arranged according to the specially designed pattern, text or track. In this way, the lamp can not only increase the need for lighting, but also turn the lamp into a decorative piece, integrating with the space design. Really meets the needs of personalized lighting.

The above uses specific examples to illustrate the present invention, but is only used to help understand the present invention, and is not intended to limit the present invention. For those skilled in the art to which the present invention pertains, according to the idea of the present invention, several simple deductions, deformations, or replacements can also be made.

Claims (27)

1. A thin-film optical lens with a microstructure, comprising: at least one lens unit, the lens unit includes a light incident surface and a light exit surface, and the light incident surface is provided with a first micro lens that maintains an original propagation direction of light. Structure, a second microstructure that controls the direction of light propagation through refraction, and a third microstructure that controls the direction of light propagation through total reflection;

   The lens unit controls a propagation path and a propagation direction of incident light through a first microstructure, a second microstructure, and a third microstructure.
2. The thin film optical lens according to claim 1, wherein the first microstructure is a planar structure that controls light to propagate in the original propagation direction, and the second microstructure is a refractive tooth that controls refraction and propagation of light through a tooth structure. Group, the third microstructure is a total reflection tooth group that controls the total reflection propagation of light through a tooth structure.
3. The thin film optical lens according to claim 2, wherein a distance between each adjacent refractive tooth of the refractive tooth group is greater than a distance between each adjacent total reflection tooth of the total reflection tooth group.
4. The thin film optical lens according to claim 2, wherein each two adjacent total reflection teeth in the total reflection tooth group are a group, and the outgoing light rays controlled by the total reflection teeth of each group intersect.
5. The thin film optical lens of claim 2, wherein the outgoing light rays controlled by the refractive tooth group intersect with the outgoing light rays controlled by the total reflection tooth group.
6. The thin-film optical lens according to claim 2, wherein each of the refractive teeth in the second microstructure has the same tooth height and different inclination of the tooth angle.
7. The thin film optical lens according to claim 5, wherein each of the total reflection teeth in the third microstructure has the same tooth height and different inclination of the tooth angle.
8. The thin film optical lens according to claim 7, wherein the tooth heights in the second microstructure and the third microstructure are the same.
9. The thin film optical lens according to claim 2, wherein the first microstructure is circular, the second microstructure is a ring-shaped refractive tooth group, and the third microstructure is a ring-shaped total reflection tooth group.
10. The thin-film optical lens of claim 9, wherein the first microstructure, the second microstructure, and the third microstructure are concentric, and the first microstructure, the second microstructure, and the third microstructure The structures are arranged in order from the inside to the outside.
11. The thin film optical lens of claim 9, wherein the first microstructure, the second microstructure, and the third microstructure are concentric, and the first microstructure, the third microstructure, and the second microstructure are concentric. The structures are arranged in order from the inside to the outside.
12. The thin film optical lens according to claim 2, wherein the first microstructure is a long strip, the second microstructure is a strip-shaped refractive tooth group, and the third microstructure is a strip-shaped total reflection Tooth set.
13. The thin-film optical lens according to claim 12, wherein the second microstructure and the third microstructure are symmetrically disposed on both sides of the first microstructure, respectively, and the second microstructure is located on the first microstructure. The first microstructure and the third microstructure are described.
14. The thin film optical lens according to claim 12, wherein the second microstructure and the third microstructure are symmetrically disposed on both sides of the first microstructure, respectively, and the third microstructure is located on the first microstructure. Said between the first microstructure and the second microstructure.
15. The thin-film optical lens according to claim 1, further comprising a diffusion portion for diffusing outgoing light, the diffusion portion being disposed on a light exit surface of the lens unit.
16. The thin-film optical lens according to claim 15, wherein the diffusion portion is a micron-sized lens display.
17. The thin-film optical lens according to claim 1, wherein the number of the lens units is plural, and the plurality of the lens units are arranged according to a preset image, text, or track.
18. The thin film optical lens according to claim 17, wherein the shape of the lens unit is a regular shape or an irregular shape.
19. The thin film optical lens according to claim 1, wherein a thickness of the lens unit is 0.001 mm to 0.5 mm.
20. The thin-film optical lens according to claim 1, wherein a material of the lens unit is an optical plastic of the lens.
21. A method for designing a thin-film optical lens having a microstructure according to any one of claims 1 to 20, wherein the material of the thin-film optical lens is optical plastic, and a light-receiving surface of the optical plastic is provided and held. A first microstructure in the original light propagation direction, a second microstructure in which the light propagation direction is controlled by refraction, and a third microstructure in which the light propagation direction is controlled by total reflection, the first microstructure, the second microstructure, and the third The specific design steps of the microstructure include:

    Designing a first microstructure on the optical plastic according to an angle of a light distribution of a design target;

    Calculate the Brewster angle based on the refractive index of the optical plastic;

    Designing a second microstructure on the optical plastic in a region where the incident angle of light is smaller than the Brewster angle;

    On the optical plastic, a third microstructure is designed in a region where the incident angle of light is greater than or equal to the Brewster angle.
22. The design method according to claim 21, wherein the first microstructure is a planar structure that controls light to propagate in the original propagation direction, and the second microstructure is a refraction tooth group that controls refraction and propagation of light through a tooth structure The third microstructure is a total reflection tooth group that controls the total reflection propagation of light through a tooth structure.
23. The design method according to claim 22, wherein in the process of designing the third microstructure, the total reflection tooth group is designed such that every two adjacent total reflection teeth are a group, and the total reflection teeth of each group are controlled The outgoing rays intersect.
24. The design method according to claim 22, further comprising the step of designing a diffusion portion having a microstructure on the light-emitting surface of the optical plastic, the diffusion portion being configured to diffuse the emitted light.
25. A lighting device comprising an LED lamp group, further comprising a thin-film optical lens having a microstructure according to any one of claims 1-20, and a light incident surface of the thin-film optical lens covers the LED. On the lamp group, the thin film optical lens controls the propagation path and the propagation direction of the light emitted by the LED lamp group through the first microstructure, the second microstructure and the third microstructure.
26. The lighting device according to claim 25, wherein the thin film optical lens is composed of a plurality of the lens units spliced, and a single of the lens units correspondingly covers at least one LED light emitting body.
27. The lighting device according to claim 25, wherein the thin film optical lens is only a single lens unit, and the lens unit covers the LED lamp group.

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