CN102537843A - Secondary optical lens module - Google Patents

Abstract

The invention discloses a secondary optical lens module. It consists of a solid lens with a rotationally symmetrical structure and a total reflection lens. The total reflection lens has a horizontal plane base and a vertical cylindrical base; a single LED is placed in the hollow part, and the incident surface is a solid lens. The bottom plane and the hollow conical side wall of the total reflection lens; the light exit surface is composed of the upper free-form surface of the solid lens and the upper plane of the total reflection lens; the outer curved surface of the total reflection lens is the total reflection surface; the base surface, the total reflection surface, the light incident The surface and the light-emitting surface jointly define the body of the secondary optical lens. The invention efficiently realizes uniform distribution of light intensity within a narrow viewing angle of the LED Lambertian light source.

Description

Secondary Optical Lens Module

technical field

The invention relates to LED lighting technology, in particular to a secondary optical lens module with uniform intensity distribution in a narrow LED viewing angle. the

Background technique

From the perspective of lighting effects, improving energy utilization and protecting human eye health, it is necessary to use lamps for uniform lighting in many occasions, such as uniform distribution of spatial intensity, that is, within a given viewing angle, a uniform light intensity distribution effect is formed, and Minimize the energy loss of invalid lighting outside the viewing angle as much as possible. The light distribution of the LED light source is approximately Lambertian, the central light is strong, and the closer to the edge, the smaller the light intensity, which cannot be directly applied to the field of uniform lighting. Secondary light distribution processing is required to improve the uniformity of illumination in the illuminated area or the uniformity of spatial light intensity. To avoid under-illumination, reduce ineffective lighting and over-illumination loss, thereby improving the utilization rate of LED light energy. the

There are certain deficiencies in the processing methods of the prior art, such as:

1) Serious loss of invalid lighting outside the specified viewing angle;

2) The LED luminous energy is distributed in the whole half space, and the secondary optical element cannot collect all the energy, resulting in a certain energy loss;

3) The size of the secondary optical lens is too large;

4) The uniformity is not high. the

Contents of the invention

The purpose of the present invention is to overcome the limitations of the LED light source's approximate Lambertian light distribution in the field of uniform lighting, and provide a secondary optical lens module with high light extraction efficiency, high uniformity of illuminance, and easy processing and installation. The secondary optical lens module is small in size and can collect the light energy of the entire half-space emitted by the LED, and the uniformity within the specified viewing angle is greater than 0.8. the

The purpose of the present invention can be achieved through the following technical solutions:

The secondary optical lens module is characterized in that it is composed of two parts: a solid lens 100 and a hollow total reflection lens 200, both of which are rotationally symmetrical structures, and the solid lens 100 and the hollow total reflection lens 200 are two parts. Part of the center line of rotational symmetry coincides with the upper and lower contact placement; the hollow total reflection lens 200 has a horizontal plane and a vertical cylindrical surface as a positioning base; a single LED is placed in the hollow part of the hollow total reflection lens 200, and the incident surface is a solid lens 100 The bottom plane and the hollow conical sidewall of the hollow total reflection lens 200; the light-emitting surface is composed of the upper free-form surface of the solid lens 100 and the upper plane of the hollow total reflection lens 200; the outer curved surface of the hollow total reflection lens 200 is a total reflection surface; the base surface, The light incident surface, the total reflection surface, and the light output surface jointly define the body of the secondary optical lens module. the

The secondary optical lens module is characterized in that the upper surface profile of the solid lens 100 is a free-form surface. the

The secondary optical lens module is characterized in that the hollow total reflection lens 200 has a conical hollow structure. the

The secondary optical lens module is characterized in that the secondary optical lens is made of PC or PMMA material through injection molding, or is machined from quartz material, and both the light incident surface and the light exit surface have a polishing layer. the

In the secondary optical lens module involved in the present invention, the base surface, the light incident surface, the total reflection surface, and the light exit surface jointly define the body of the secondary optical lens; the light incident surface is hollowed out by the bottom plane of the solid lens 100 and the hollow total reflection lens 200 Conical side wall structure, with enough space to place a single LED300. the

The secondary optical lens involved in the present invention is aimed at a single LED. How many LEDs are installed in the LED lighting equipment, and how many secondary optical lens modules must be installed. Therefore, when designing the lighting equipment, each secondary optical lens can be separately Compared with the existing technology that each lighting device has only one secondary lens, the light output of the lighting device is easier to control. the

The advantages of the present invention are: by applying the LED secondary optical lens module, the obstacle of applying the LED Lambertian light source distribution to the field of uniform illumination within a certain narrow viewing angle is overcome, and the loss of invalid illumination and over-illumination is reduced, thereby greatly improving the Uniformity of illumination in the illuminated area and utilization rate of LED light energy. the

The advantage of the present invention is that: the secondary optical lens module is designed for a single LED, and the number of LEDs can be designed according to the needs of use, or the lighting equipment can be used in modules, and has strong flexibility. the

The invention has the advantages of small overall size of the secondary optical lens module, simple structure, high mechanical dimension stability, convenient processing, and can be extended to the uniform illumination field of various viewing angles. the

Description of drawings

Fig. 1 a is the first embodiment schematic diagram of LED secondary optical lens module of the present invention;

Fig. 1b is a sectional view of the structure shown in Fig. 1a;

Fig. 2 a is the sectional view of the solid lens 100 of structure shown in Fig. 1 b;

Fig. 2b is a hollow total reflection lens 200 sectional view of the structure shown in Fig. 1b;

Fig. 3 is the ray propagation roadmap of prior art secondary optical lens module;

Fig. 4 is the light beam effect diagram after the LED is installed with the secondary optical lens module of the present invention;

Fig. 5 is the relative light intensity distribution Cartesian coordinate curve figure of prior art secondary optical lens module;

Fig. 6 is the schematic diagram of the second embodiment of the present invention;

Fig. 7 is the sectional view of the second embodiment of the present invention;

Fig. 8 is a simulated light spot of the second embodiment of the present invention. the

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and implementation. the

With reference to Fig. 1 and Fig. 2, the first embodiment of the present invention is a group of secondary optical lens entity lens 1 and hollow total reflection lens 2, and two lenses are used in conjunction, wherein surface 101 coincides with 209, and surface 102 coincides with 210, The secondary optical lens module is formed by bonding with glue. There are reference planes 203 and 204, and 203 is a plane, 204 is a cylindrical side; the light incident surface is composed of 101 and 208, and 101 is a plane, 208 is a conical side; 300 is an LED, placed at the center of rotational symmetry of the light incident surface, Keep a certain distance from the plane 101; the light-emitting surface is composed of 104 and 207, wherein 104 is a free-form surface, 207 is a plane; the total reflection surface 202 is a free-form surface. In this embodiment, the secondary optical lenses 100 and 200 are both made of PC material through injection molding, and the light incident surface, total reflection surface and light exit surface all have a polished layer, which efficiently realizes uniform distribution of intensity within a narrow viewing angle of 40°. Referring to Fig. 3, the energy distribution of the Lambertian light-emitting LED is within 180° of the entire half space, and the emission angle is relatively large. In the present invention, an independent secondary optical lens module is added to each LED to convert the light within 180° of the half space The energy is concentrated and the intensity is evenly distributed within a narrow viewing angle of 40°. The large-angle light rays emitted by the LED indicated by the edge rays are emitted through the surfaces 208 , 202 and 207 in sequence, and the small-angle light rays emitted by the LED indicated by the central rays are emitted through the surfaces 101 and 104 in sequence. The beam effect is shown in Figure 4. Thus, the uniform distribution curve of the intensity within the viewing angle of 40° as shown in FIG. 5 is formed, and the uniformity is greater than 0.8. the

The second embodiment of the present invention is an LED uniform lighting lamp with a narrow viewing angle, which is the application of the first embodiment of the present invention. Referring to FIG. 6 and FIG. 7 , the LED narrow viewing angle uniform lighting lamp includes a mechanical structure 400 , circuit parts 500 and 300 , and optical parts 100 , 200 and 600 . Mechanical structure 400 is made of base 401, middle shell 402, gland 403 and pressure ring 404, and 401 has the interface that is connected with radiator and drive circuit; Circuit part includes PCB board 500 and LED 300; Optical part includes secondary optical lens mold Groups 100 and 200, and flat quartz glass 600. the

The third embodiment of the present invention is an example of the design and optical verification of the secondary optical lens group. The light output requirements of the lens are set as shown in the light distribution curve diagram of Figure 5. Figure 5 is the Cartesian coordinate form of the light distribution curve. The abscissa 0° is the center of the light-emitting surface of the secondary optical lens module, and each ordinate represents a relative light intensity value, and the higher the light intensity is, the greater the light intensity is; each angle value in the figure is symmetrical to the rotation on this section The angle of the central axis, which coincides with the central axis of rotational symmetry, is defined as 0°. According to the principle of refraction, it can be known that the shape of the secondary optical lens is the shape of the secondary optical lens in the first embodiment of the present invention. The lens of the first embodiment of the present invention is used for simulation verification, and the receiving surface is placed at a long distance to form a light spot as shown in Figure 8, which realizes the design purpose of the secondary optical lens module of the present invention. the

The secondary optical lens module of the present invention solves the optical problem of LED lighting, makes the irradiation of LED point light sources evenly distributed according to the required light intensity, improves utilization efficiency, and reduces light energy waste and environmental light pollution. the

The above disclosures are only preferred embodiments of the present invention, and of course cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the scope of claims of the present invention still fall within the scope of the present invention. the

Claims (4)

1. A secondary optical lens module, which consists of two parts, a solid lens (100) and a hollow total reflection lens (200), is characterized in that: the solid lens (100) and the hollow total reflection lens (200) are both rotating Symmetrical structure, two parts of solid lens (100) and hollow total reflection lens (200) coincide with the center line of rotation symmetry and are placed in contact with each other; hollow total reflection lens (200) has a horizontal plane and a vertical cylindrical surface as positioning base; hollow A single LED (300) is placed in the hollow part of the total reflection lens (200), the light incident surface is the bottom plane of the solid lens (100) and the hollow conical side wall of the hollow total reflection lens (200); The upper free-form surface of the hollow total reflection lens (200) is composed of the upper plane; the outer curved surface of the hollow total reflection lens (200) is a total reflection surface; the base surface, the light incident surface, the total reflection surface and the light exit surface jointly define the secondary optical The body of the lens module. 2. A secondary optical lens module according to claim 1, characterized in that: the upper surface of the solid lens (100) is a free-form surface. 3. A secondary optical lens module according to claim 1, characterized in that: the hollow structure of the hollow total reflection lens (200) is a cone. 4. A secondary optical lens module according to claim 1, characterized in that: the lens in the secondary optical lens module is formed by injection molding of PC or PMMA material, or machined from quartz material into, and both the light-incident surface and the light-exit surface have a polishing layer.

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