CN108204572A - A kind of micro-structure adding method for changing slim lens angle - Google Patents

Abstract

The invention discloses a method for adding a microstructure to change the angle of a thin lens. The microstructure directly added to the thin lens is used to change the light output angle and realize soft and uniform spot lighting. The traditional method for changing the angle of this type of lens is Add a second lens or directly modify key optical surfaces. The method of adding a second lens increases the cost of the system and reduces the efficiency. The method of directly modifying the key optical surface is equivalent to re-opening the mold and increasing the mold cost. The method of the present invention can directly add microstructures on the lens, without adding new system components, without modifying the curved surface of key light rays, and without affecting the uniformity and softness of the light spot.

Description

A Microstructure Addition Method for Changing the Angle of Thin Lens

technical field

The invention relates to the technical field of LED lenses, in particular to a microstructure adding method for changing the angle of a thin lens.

Background technique

In the prior art, the general method of changing the light output angle of a thin lens is to directly modify the key optical surface, or add a second lens of about the same size behind the lens to change the beam angle twice, and add a second lens. The cost of the system is increased and the efficiency is also reduced. The method of directly modifying the key optical surface is equivalent to re-opening the mold and increasing the cost of the mold.

Contents of the invention

The purpose of the present invention is to design a method of directly adding a microstructure on a thin lens to change the light output angle to adjust the beam angle without affecting the soft and uniform spot illumination.

The solution of the present invention is: a microstructure adding method for changing the angle of a thin lens, the thin lens is a rotationally symmetrical structure, the bottom of the lens is provided with a concave optical cavity for placing the LED light source, and the inner wall of the optical cavity is formed as the incident surface, The upper surface of the top of the lens is set as an exit surface, and the side between the top and the bottom is formed as a reflective surface; the ratio of the height of the thin lens from the exit surface to the bottom of the lens to the diameter of the exit surface is not greater than 0.2; the method includes the following steps:

A. Set the incident surface as a conical surface;

B. Set the upper surface as a plane or an arc;

C. Coating reflective film on the reflective surface;

D. A number of continuously arranged microstructure units are arranged on the surface of the exit surface, and the surface area of each microstructure unit is less than 2 square millimeters;

E, the surface of the microstructure unit is set as an arc surface;

F. The light emitted by the light source is refracted into the lens through the incident surface, then totally reflected or reflected by the upper surface to the reflective surface, and then collimated and emitted from the upper surface after total reflection or reflection by the reflective surface;

G. Collimating the outgoing light in step F, collimating it into the microstructure unit, and emitting from the surface of the microstructure unit;

H. Adjust the radian size of the surface of the microstructure unit to adjust the exit angle of the light emitted from the surface of the microstructure unit, so that the collimated exit light in step F is no longer collimated;

I. Emit all the outgoing light rays adjusted by the microstructure unit together to form an integrated light beam, and the outgoing angle of the integrated light beam is equal to the outgoing light angle of the outgoing light rays adjusted by a single microstructural unit.

Preferably, the microstructure units are hexagonal or rectangular, and the microstructure units are closely arranged with each other and cover the surface of the emitting surface.

Preferably, the reflective surface is set as a groove surface composed of several V-shaped grooves, and the grooves are radially distributed around the center of the lens on the reflective surface.

Preferably, the slope of the curve formed by intercepting the incident surface by a plane passing through the rotational symmetry axis gradually decreases from approaching the rotational symmetry axis to away from the rotational symmetry axis.

Preferably, the reflective surface transitions upward from the bottom of the lens to the exit surface at the top of the lens, and the curve formed by the reflective surface being intercepted by a plane passing through the axis of rotational symmetry gradually moves away from the axis of rotational symmetry from bottom to top, with a slope from close to the axis of rotational symmetry gradually increases away from the axis of rotational symmetry.

Preferably, the exit surface includes a first exit surface and a second exit surface, the first exit surface is circular and located in the middle of the exit surface, and the second exit surface is located on the outer periphery of the exit surface in a manner surrounding the first exit surface;

The microstructure unit is arranged on the second exit surface, while no microstructure unit is arranged on the first exit surface.

Preferably, the microstructure unit is formed in the following manner:

(1) Draw a first arc on the exit surface of the lens with the center as the starting point, and the end point of the first arc is located at the edge of the exit surface;

(2) Copy the first arc and take the center as the rotation point, and rotate the copied first arc by 360/n degrees, where n is an integer, and 60≤n≤90;

(3) Repeat step (2) until all the first arcs cover the entire exit surface with an interval of 360/n degrees;

(4) Copy all the first arcs, and take any straight line passing through the center on the exit surface as the axis of symmetry, and perform mirror operation on all the copied first arcs to form the second arc;

(5) All the first arcs and all the second arcs intersect each other to form the microstructure unit.

Preferably, the surface radians of the microstructure units are inconsistent, and the closer to the center of the microstructure unit, the larger the surface radian.

The method designed in the present invention can directly add microstructures to the lens, without adding new system components, and without modifying the curved surface of the key light. By adjusting the radian of the surface of the microstructure unit, the purpose of adjusting the light beam output angle can be realized without affecting the lighting. Uniform and soft effect of light spots.

Description of drawings

Fig. 1 is the lens schematic diagram of prior art

Fig. 2 is the structural cross-sectional view of the lens designed by the inventive method

Figure 3 is an enlarged view of part P in Figure 2

Fig. 4 is a kind of lens structure that the inventive method designs

Fig. 5 is the schematic diagram of the hexagonal microstructure of the lens designed by the method of the present invention

Fig. 6 is the schematic diagram of the double helix microstructure of the lens designed by the method of the present invention

Detailed ways

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram of a structure of a thin lens in the prior art. In the thin lens of the prior art, the light beam passes through the light distribution of the lens to form a collimated outgoing beam.

2 to 6 are examples of lens structures with microstructures composed of several microstructure units designed according to the method of the present invention.

A microstructure addition method for changing the angle of a thin lens according to an embodiment of the present invention.

The thin lens of this embodiment has a rotationally symmetrical structure. The bottom of the lens is provided with a concave optical cavity for placing the LED light source. The inner wall of the optical cavity is formed as the incident surface 1, and the top surface of the lens is set as the outgoing surface 3. The side surface of the thin lens is formed as a reflective surface 2; the ratio of the height of the thin lens from the exit surface to the bottom of the lens to the diameter of the exit surface is not greater than 0.2.

The method of the present embodiment comprises the following steps:

A, the incident surface is set as a conical surface, and the side line of the conical surface can be a straight line or an arc, and the present embodiment adopts an arc, as shown in the incident surface 1 of Fig. 1 and Fig. 2;

B. Set the upper surface as a plane;

C. Coating reflective film on the reflective surface;

D. Microstructures are arranged on the surface of the exit surface. The microstructures are composed of several continuously arranged microstructure units 4, and the surface area of each microstructure unit is less than 2 square millimeters; as shown in the enlarged drawings of Fig. 2 and Fig. 3, the microstructure units 4 densely distributed on the exit surface 3;

E, the surface of the microstructure unit is set as an upward convex arc;

F. The light emitted by the light source is refracted into the lens through the incident surface, then totally reflected or reflected by the upper surface to the reflective surface, and then collimated and emitted from the upper surface after total reflection or reflection by the reflective surface;

G. Collimating the outgoing light in step F, collimating it into the microstructure unit, and emitting from the surface of the microstructure unit;

H. Adjust the radian size of the surface of the microstructure unit to adjust the exit angle of the light emitted from the surface of the microstructure unit, so that the collimated exit light in step F is no longer collimated;

I. Emit all the outgoing light rays adjusted by the microstructure unit together to form an integrated light beam, and the outgoing angle of the integrated light beam is equal to the outgoing light angle of the outgoing light rays adjusted by a single microstructural unit.

As a supplement to the above main steps, the microstructure units may be hexagonal or rectangular, and each microstructure unit is closely arranged with each other and covers the surface of the exit surface. As shown in FIG. 5 , its microstructure is hexagonal, and each hexagonal shape is covered with each other on the surface of the exit surface.

As a supplement to the above main steps, the reflective surface can be set as a groove surface composed of several V-shaped grooves, and the grooves are radially distributed around the center of the lens on the reflective surface, as shown in Figure 4 .

As a supplement to the above main step, the slope of the curve formed by intercepting the incident surface by a plane passing through the axis of rotational symmetry gradually decreases from being close to the axis of rotational symmetry to away from the axis of rotational symmetry.

As a supplement to the above main steps, the reflective surface transitions upward from the bottom of the lens to the outgoing surface of the top of the lens, and the curve formed by the reflective surface being cut by a plane passing through the axis of rotational symmetry gradually moves away from the axis of rotational symmetry from bottom to top, with a slope from The direction increases gradually from close to the axis of rotational symmetry to away from the axis of rotational symmetry.

As shown in Figure 6, as a further supplement to the above main steps:

A double helix microstructure unit designed and formed by:

(1) Draw a first arc on the exit surface of the lens with the center as the starting point, and the end point of the first arc is located at the edge of the exit surface;

(2) Copy the first arc and take the center as the rotation point, and rotate the copied first arc by 360/n degrees, where n is an integer, and 60≤n≤90; for example, n is equal to 66.

(3) Repeat step (2) until all the first arcs cover the entire exit surface with an interval of 360/n degrees;

(4) Copy all the first arcs, and take any straight line passing through the center on the exit surface as the axis of symmetry, and perform mirror operation on all the copied first arcs to form the second arc;

(5) All the first arcs and all the second arcs intersect each other to form the microstructure unit.

On the basis of the above steps (1) to (5), the exit surface 3 is divided into a first exit surface and a second exit surface, the first exit surface is circular and is located in the middle of the exit surface, and the second exit surface is surrounded by The first exit surface is located on the periphery of the exit surface; the microstructure unit is arranged on the second exit surface, while no microstructure unit is arranged on the first exit surface. At the same time, the surface curvature of each microstructure unit is inconsistent, and the closer to the center of the microstructure unit, the larger the surface curvature.

The method designed in the present invention can directly add microstructures to the lens, without adding new system components, and without modifying the curved surface of the key light. By adjusting the radian of the surface of the microstructure unit, the purpose of adjusting the light beam output angle can be realized without affecting the lighting. Uniform and soft effect of light spots.

Claims (8)

1. A microstructure adding method for changing the angle of a thin lens, the thin lens is a rotationally symmetrical structure, the bottom of the lens is provided with a concave optical cavity for placing an LED light source, the inner wall of the optical cavity is formed as an incident surface, and the upper surface of the lens top As the exit surface, the side between the top and the bottom is formed as a reflective surface; the ratio of the height of the thin lens from the exit surface to the bottom of the lens to the diameter of the exit surface is not greater than 0.2; it is characterized in that the method includes the following steps: A. Set the incident surface as a conical surface; B. Set the upper surface as a plane or an arc; C. Coating reflective film on the reflective surface; D. A number of continuously arranged microstructure units are arranged on the surface of the exit surface, and the surface area of each microstructure unit is less than 2 square millimeters; E, the surface of the microstructure unit is set as an arc surface; F. The light emitted by the light source is refracted into the lens through the incident surface, then totally reflected or reflected by the upper surface to the reflective surface, and then collimated and emitted from the upper surface after total reflection or reflection by the reflective surface; G. Collimating the outgoing light in step F, collimating it into the microstructure unit, and emitting from the surface of the microstructure unit; H. Adjust the radian size of the surface of the microstructure unit to adjust the exit angle of the light emitted from the surface of the microstructure unit, so that the collimated exit light in step F is no longer collimated; I. Emit all the outgoing light rays adjusted by the microstructure unit together to form an integrated light beam, and the outgoing angle of the integrated light beam is equal to the outgoing light angle of the outgoing light rays adjusted by a single microstructural unit. 2 . The microstructure adding method for changing the angle of a thin lens according to claim 1 , wherein the microstructure units are hexagonal or rectangular, and the microstructure units are closely arranged with each other and cover the surface of the exit surface. 3. The microstructure adding method for changing the angle of the thin lens according to claim 1, characterized in that, the reflective surface is set as a groove surface made up of several V-shaped grooves, and the grooves surround the lens with each other The centers are radially distributed on the reflective surface. 4. The microstructure adding method for changing the angle of a thin lens according to claim 1, wherein the slope of the curve formed by the incident surface being intercepted by a plane passing through the axis of rotational symmetry is from close to the axis of rotational symmetry to far away from the axis of rotational symmetry axis gradually decreases. 5. The microstructure adding method for changing the angle of a thin lens according to claim 1, wherein the reflective surface transitions upward from the bottom of the lens to the outgoing surface of the top of the lens, and the reflective surface is intercepted by a plane passing through the axis of rotational symmetry The formed curve gradually moves away from the rotational symmetry axis from bottom to top, and its slope gradually increases from the direction close to the rotational symmetry axis to the direction away from the rotational symmetry axis. 6. The microstructure adding method for changing the angle of a thin lens according to claim 1, wherein the exit surface comprises a first exit surface and a second exit surface, and the first exit surface is circular and is located at the center of the exit surface. In the middle, the second exit surface is located on the periphery of the exit surface in a manner surrounding the first exit surface; The microstructure unit is arranged on the second exit surface, while no microstructure unit is arranged on the first exit surface. 7. The microstructure adding method for changing the angle of the thin lens according to claim 1, wherein the microstructure unit is formed in the following manner: (1) Draw a first arc on the exit surface of the lens with the center as the starting point, and the end point of the first arc is located at the edge of the exit surface; (2) Copy the first arc and take the center as the rotation point, and rotate the copied first arc by 360/n degrees, where n is an integer, and 60≤n≤90; (3) Repeat step (2) until all the first arcs cover the entire exit surface with an interval of 360/n degrees; (4) Copy all the first arcs, and take any straight line passing through the center on the exit surface as the axis of symmetry, and mirror all the copied first arcs to form the second arc; (5) All the first arcs and all the second arcs intersect each other to form the microstructure unit. 8 . The microstructure addition method for changing the angle of a thin lens according to claim 7 , wherein the surface curvatures of the microstructure units are inconsistent, and the closer to the center of the microstructure unit, the larger the surface curvature.