CN107448781B

CN107448781B - LED collimation uniform lighting structure for rectangular car lamp modeling and implementation method thereof

Info

Publication number: CN107448781B
Application number: CN201710676366.4A
Authority: CN
Inventors: 成丽华; 严辉; 何士群; 张腾; 郁邹庆
Original assignee: HASCO Vision Technology Co Ltd
Current assignee: HASCO Vision Technology Co Ltd
Priority date: 2017-08-09
Filing date: 2017-08-09
Publication date: 2023-11-03
Anticipated expiration: 2037-08-09
Also published as: CN107448781A

Abstract

The realization method for the LED collimation uniform illumination of the rectangular car lamp model is realized by longitudinally focusing collimation and transversely diverging collimation of the car lamp model; an LED collimation uniform lighting structure for a rectangular car lamp modeling, comprising: a lens (1) which is arranged by taking the optical center of the LED light source as the center and a collimating tooth (2) which is arranged at the front end of the lens; the incidence surface of the lens (1) is generated by a longitudinal collimation surface sweeping along a transverse semicircular arc; the light emergent surface is formed by stretching a transverse divergent surface along the vertical direction. And then wrapping the materials into a solid according to the width of the process requirement. The utility model provides an LED collimation uniform lighting structure for a rectangular car lamp model and an implementation method thereof, which provide illumination meeting the model, and improve the luminous flux utilization rate on the basis of not increasing the setting of the number of LEDs and not increasing the cost.

Description

LED collimation uniform lighting structure for rectangular car lamp modeling and implementation method thereof

Technical Field

The utility model belongs to the field of LED car lamp illumination, and particularly relates to an LED collimation uniform illumination structure for a rectangular car lamp model and an implementation method thereof.

Background

The concentrator is generally a circular structure with uniform concentrating properties in two perpendicular dimensions, has low effective utilization when applied to slim modeling, and requires multiple LEDs. In the design process of a commonly used condenser, the effective area used is internally tangent rectangular due to modeling, so that the practical use efficiency of the condenser is low. The length covered by the condenser is the long side of the rectangular area, the length is limited, and the length is limited by the radius of the condenser, so that a plurality of LEDs are needed to meet the modeling.

The utility model application of application number 2014108405398 discloses an LED remote illumination optical collimation system, which comprises an LED area light source, an aspheric lens and a Fresnel lens, wherein the aspheric lens is positioned between the LED area light source and the Fresnel lens, the centers of the LED area light source, the aspheric lens and the Fresnel lens are collinear, and the distance between the LED area light source and the aspheric lens is 0-1000 mm.

The application 2014800657365 discloses an LED light source automatic lighting device having an elongated light collimator/mixer/integrator with multiple sides having a receiving lens and an output lens, both having a leakage protection member, wherein the receiving leakage protection member is nested within the output leakage protection member. The elongated integrator has a square input cross section and a hexagonal or octagonal output cross section and is tapered such that the input cross section is smaller than the output cross section.

The utility model application of application number 2016110803161 discloses an LED collimation lighting optical device with a refraction lens and a reflector, which comprises the refraction lens, the reflector, a first curved surface, a second curved surface, a third curved surface, a fourth curved surface, a fifth curved surface, a sixth curved surface, a seventh curved surface, an eighth curved surface, a ninth curved surface, a tenth curved surface, an eleventh curved surface and a twelfth curved surface, wherein the first curved surface is a rotationally symmetrical free curved surface, the second curved surface is a semicircular installation plane, the third curved surface is a rotationally symmetrical free curved surface, the fourth curved surface and the fifth curved surface are cylindrical surfaces, the sixth curved surface is a non-rotationally symmetrical free curved surface, and the eighth curved surface and the ninth curved surface are reflective free curved surfaces.

Disclosure of Invention

In order to solve the problems, the utility model provides a light which meets the modeling, improves the luminous flux utilization rate on the basis of not increasing the number of LEDs and not increasing the cost, and provides an LED collimation uniform lighting structure for a rectangular car lamp modeling and an implementation method thereof, wherein the technical scheme is as follows:

a LED collimation even lighting structure for rectangle car light molding, its characterized in that includes: a lens (1) which is arranged by taking the optical center of the LED light source as the center and a collimating tooth (2) which is arranged at the front end of the lens;

the incidence surface of the lens (1) is generated by a longitudinal collimation surface sweeping along a transverse semicircular arc; the light emergent surface is formed by stretching a transverse divergent surface along the vertical direction. Then wrapping the materials into a solid according to the width of the process requirement;

the first free-form surface forming the focusing collimation in the width direction of the rectangular modeling is composed of 5 continuous curved surface sections;

the first curved surface section is a Fresnel surface section which is arranged by taking the optical center as the center;

the second free-form surface section and the third free-form surface section are straight-edge sections symmetrically arranged at two ends of the first free-form surface section;

the fourth and fifth free-form surface sections are parabolic sections symmetrically arranged at two ends of the second and third free-form surface sections;

the light is focused through the Fresnel surface section to form first parallel light; the first parallel light and the second parallel light form illumination light through the combined action of the straight line segment and the parabolic segment.

The utility model relates to an LED collimation uniform lighting structure for a rectangular car lamp model, which is characterized in that:

the second free curved surface forming the rectangular modeling and diverging in the length direction comprises a spherical surface and a curved exit surface which are sequentially arranged along the light propagation direction; a collimating tooth (2) is arranged above the curve emergent surface;

the light reaches the curve exit surface after passing through the spherical surface to finish the light divergence in the length direction, and the light after the divergence is collimated into parallel light by the collimating teeth.

the collimating teeth are formed by a central setting area and side section setting areas symmetrically connected to two ends of the central setting area;

the center setting area is set to be a Fresnel surface;

the side section setting area is set as a serrated surface with gradually changed tooth intensity.

the focus of the parabolic section is determined by the intersection point of opposite extension lines of the refraction light rays at the two end points of the straight-side section.

the curved exit surface is used for diverging the light rays within the illumination of 0-60 degrees,

the upper limit value of the angle can be finely adjusted within the range of plus or minus 0 degrees and 10 degrees according to the half-attenuation angle of the LED and the distance between the lens and the collimating teeth.

the curve emergent surface consists of a first curve emergent surface, a second curve emergent surface and a third curve emergent surface,

the first curve emergent surface is used for diverging light rays within the illuminance of 0-15 degrees;

the second curve emergent surface is used for diverging light rays within the illuminance of 15-30 degrees;

the third curved exit surface is configured to diverge light within an illuminance range of 30 DEG to 60 deg.

The realization method for LED collimation uniform illumination for rectangular car lamp modeling is characterized by comprising the following steps:

the implementation method is realized by longitudinally focusing and collimating and transversely diverging and collimating the modeling of the car lamp;

the method comprises the following steps:

s1: according to the technological requirements, setting a Fresnel surface by taking the optical center of the LED as the center;

s2: setting straight edges meeting the technological requirements by taking two end points of a Fresnel surface as starting points;

s3: ray tracing is carried out on the outline formed by the Fresnel surface and the straight edge, so as to determine the path of the ray passing through the two end points of the straight edge;

s4: reversely extending the light passing through the two end points of the straight edge, and determining the intersection point of the reverse extension lines;

s5: setting the intersection point of the reverse extension lines as the focus of the parabola so as to determine the parabola;

s6: sweeping the parabola, the straight edge and the Fresnel surface around a semicircle in the vertical direction to form an incident surface;

s7: designing a free-form surface for transversely diverging the illuminance of the LED by utilizing ray tracing; and a collimating tooth matched with the free curved surface and used for collimating light rays is arranged.

The utility model relates to a method for realizing LED collimation uniform illumination for a rectangular car lamp model, which is characterized by comprising the following steps:

step S7 further includes: a circle is arranged between the LED light source and the free-form surface for transversely diverging the illumination of the LED, and the light reaches the free-form surface after passing through the circle.

in the step S7, the free-form surface for diverging the illuminance of the LED is composed of a first curved surface section, a second curved surface section and a third curved surface section which are sequentially and symmetrically arranged from the optical axis as the center to two sides,

the first curved surface section is used for diverging light rays within the illumination range of 0-15 degrees;

the second curved surface section is used for diverging light rays within the illumination range of 15-30 degrees;

the third curved surface section is used for diverging light rays within the illumination range of 30-60 degrees.

The utility model provides an LED collimation uniform lighting structure for a rectangular car lamp model and an implementation method thereof, which provide illumination meeting the model, and improve the luminous flux utilization rate on the basis of not increasing the setting of the number of LEDs and not increasing the cost.

Drawings

FIG. 1 is a flow chart of the steps of the present utility model;

FIG. 2 is a schematic cross-sectional view of the structure of the present utility model;

FIG. 3 is a schematic bottom view of the structure of the present utility model;

FIG. 4 is a graph of a laterally divergent collimated light ray in the present utility model;

fig. 5 is a cross-sectional view of a longitudinally focused collimated light ray in the present utility model.

In the figure, 1 is a lens; and 2 is a collimating tooth.

Detailed Description

The utility model further provides an LED collimation uniform lighting structure for a rectangular car lamp model and an implementation method thereof according to the attached drawings and the specific embodiments.

An LED collimation uniform lighting structure for rectangular vehicle lamp modeling as shown in fig. 2, 3, 4 and 5, comprising: a lens (1) which is arranged by taking the optical center of the LED light source as the center and a collimating tooth (2) which is arranged at the front end of the lens;

Wherein, the liquid crystal display device comprises a liquid crystal display device,

the center setting area is set to be a Fresnel surface;

A method for realizing the collimation and uniform illumination of an LED for a rectangular car lamp model is shown in figure 1,

the longitudinal focusing collimation and the transverse diverging collimation of the car lamp model are realized;

the method comprises the following steps:

Description of the principles

In order to improve the energy utilization efficiency of the condenser and reduce the number of LEDs, the utility model carries out secondary divergence on the light beams in the transverse direction so as to reduce the number of LEDs used; the energy waste is reduced by passing the collimated beam longitudinally. The basic components are a transversely divergent, longitudinally collimated lens and a collimating tooth. The lens with the transverse divergence and the longitudinal collimation has various shapes, and the main purpose is to enlarge the divergence angle of the LED. The surface of the collimating teeth close to the LED is a plurality of collimating folded surfaces, the other surface of the collimating teeth can be any shape, can be a plane or a curved surface, and can meet the requirement of regulations by designing optical patterns.

The technical scheme aims to concentrate luminous flux of the LED on a luminous surface of an elongated rectangle, firstly, the luminous direction of the LED is changed through the free curved surface in the transverse direction, the refraction of the light is increased in a small-angle area, the deflection angle of the light is gradually reduced in a large-angle area, so that the illumination intensity of the LED at each angle is consistent, and then the emitted light is refracted into parallel light through the collimating teeth; secondly, a condensing structure is designed longitudinally, and divergent light of the LED is focused and collimated in a shorter area. The method comprises the following steps:

the longitudinal design mainly aims at realizing the convergence of energy.

The design steps are as follows:

1. the optical center of the LED is selected, and a Fresnel surface (the size of the Fresnel surface is determined according to input conditions) is designed by taking the optical center as the center, so that scattered light of the LED is converged.

2. Straight edges (draft angles) meeting processing requirements are made with two edges of the condenser as starting points.

3. And setting material properties, and performing ray tracing on the outline.

4. The refraction light rays at two ends of the selected folded edge are reversely prolonged and intersected at one point.

5. And setting a parabola by taking the point as a focus, wherein the focal length of the parabola is fixed by the opening width of the specific lamp.

6. The plane symmetry is made into parabola on the other side by taking the optical point of the LED as the center

7. The non-overlapping connection of the 3 sections is the planing surface diagram in the X direction.

And (3) transverse design:

the transverse design thought is as follows: the divergence angle of the light is increased by the difference of refractive indexes of air and materials. It is considered that the refraction angle increases only when light enters the optical/hydrophobic medium from the optical dense medium, and the propagation path of the light does not change when the light with the center as the end point passes through the circle. Therefore, in design, firstly, a circle is designed at the light incidence end to enable light to enter the light-tight medium, and then when the light exits from the light-tight medium, the emergent surface is designed into a free curve to increase the divergence angle of the light.

For many LEDs, the half-roll angle is typically 30 degrees, and the energy of the LED at small angles is greater and decreases as the spread angle increases. The exit face is then designed in segments: in the small-angle area of the emergent light of the LED, a section of free curve is designed for increasing the divergence angle of the LED, and when the free curve is designed, the refraction angle of light in the small-angle area is large and then gradually decreases, and the free curve is symmetrical about the optical center of the LED.

And (3) cutting off the free curve No. 3 in the upper graph by two planes with the included angle theta, reserving the interconnecting parts, and then chamfering the cut curves (the size of the fillets is finely adjusted by simulation). A second free curve is then made, which tends to gradually decrease the angle of deflection of the refracted light. One side is firstly made, and then symmetrical data is made by the optical center of the LED. By optical simulation, a suitable second-segment curve cutoff point is evaluated. And (3) using a cut-off point cut-off curve, and designing a plane cut-off curve of the third section area by means of a light simulation mode. After the design of the prototype of the lens portion is completed, the design of the collimating teeth matching with the design is started. The distance between the collimating teeth and the lens is required to be determined according to the situation, and for the same lens, the larger the distance between the collimating teeth and the lens is, the longer the transverse diffusion distance of the light beam is, so that the 3-section specific design of the lens needs to be designed through input conditions, and the collimating teeth also need to be designed by means of ray tracing subareas.

The design principle of the collimating teeth is that the light rays reflected by the lens are changed into parallel light through refraction. The collimating teeth in the middle area are designed with Fresnel surfaces, and the collimating teeth on two sides are based on the refraction principle and the total reflection principle of light.

Claims

1. A LED collimation even lighting structure for rectangle car light molding, its characterized in that includes: a lens (1) which is arranged by taking the optical center of the LED light source as the center and a collimating tooth (2) which is arranged at the front end of the lens;

the incidence surface of the lens (1) is generated by a longitudinal collimation surface sweeping along a transverse semicircular arc; the emergent surface of the light is formed by stretching a transverse divergent surface along the vertical direction, and then the light is packaged into a solid according to the width of the process requirement;

2. A LED collimated uniform illumination structure for a rectangular vehicle lamp styling as set forth in claim 1, wherein:

3. A LED collimated uniform illumination structure for a rectangular vehicle lamp styling as set forth in claim 1, wherein:

the center setting area is set to be a Fresnel surface;

4. A LED collimated uniform illumination structure for a rectangular vehicle lamp styling as set forth in claim 1, wherein:

5. A LED collimated uniform illumination structure for a rectangular vehicle lamp styling as claimed in claim 2, wherein:

6. The LED collimated uniform illumination structure for a rectangular vehicle lamp styling of claim 5, wherein:

7. The realization method for LED collimation uniform illumination for rectangular car lamp modeling is characterized by comprising the following steps:

the method comprises the following steps:

8. The method for realizing the collimation and uniform illumination of the LED for the rectangular car lamp model according to claim 7, wherein the method comprises the following steps:

9. The method for realizing the collimation and uniform illumination of the LED for the rectangular car lamp model according to claim 7, wherein the method comprises the following steps: