CN203703816U

CN203703816U - LED lens capable of generating square light spot and optical system

Info

Publication number: CN203703816U
Application number: CN201320625550.3U
Authority: CN
Inventors: 刘思健; 李晓旭
Original assignee: Beijing Rock Tian Boyuan Science And Technology Co Ltd
Current assignee: Beijing Rock Tian Boyuan Science And Technology Co Ltd
Priority date: 2013-10-12
Filing date: 2013-10-12
Publication date: 2014-07-09
Anticipated expiration: 2023-10-12

Abstract

The utility model discloses an LED lens capable of generating a square light spot and an optical system. The LED lens is used in front of an LED point light source chip and provided with a front surface, a rear surface and side surfaces, wherein the front surface is a part of spherical surface with certain curvature, the side surfaces are cylindrical surfaces, and the rear surface adopts an inwards-recessed aspheric surface shape. According to the LED lens and the optical system, the structural design is reasonable, the spotlighting effect is good, the processing is facilitated, the processing cost can be saved, the square light spot can be formed on the illumination surface, the illumination is more uniform, and the light utilization rate can be effectively increased.

Description

A kind of LED lens and optical system that produces square focus spot

Technical field

The utility model belongs to LED technical field, relates in particular to a kind of LED lens and optical system that produces square focus spot.

Background technology

LED manufacturing technology is constantly progressive, and with conventional light source ratio, LED volume is little, luminous efficiency is high, and the monochromaticjty of light is good, and power consumption is few, long service life, safe and reliable, caloric value is low, thereby obtains applying more and more widely, even can be used as electric light source processes in many application scenarios, this brings great convenience to the optical design of light fixture, meanwhile, has avoided the light source occurring in large scale conventional light source light fixture to block and absorption.The light efficiency of large power white light LED has reached 100lm/w at present, more than the light efficiency of stable product also has 90lm/w.This light efficiency makes LED enter general lighting becomes possibility, particularly belong to the progressively acquisition application of field of directional lighting in road lighting etc., but, because the cost ratio conventional light source of current LED is much higher, LED must be taking the overall light efficiency that improves LED illuminator as prerequisite for the popularization of general lighting, and this will rely on the efficient light utilization rate that improves LED lamp.But with regard to current LED street lamp, LED Tunnel Lamp, the light beam producing when LED work is penetrated directionality before being, also exist illumination range little, intensity of illumination is defect pockety on road surface, thereby limit to a certain extent applying of LED street lamp, LED Tunnel Lamp, in order effectively to control the uniformity of LED beam quality improvement light shield, improve luminous flux, what this will join carries out secondary light-distribution with secondary optics.At present at the class formation that mostly adopts light cup, optical reflective disk aspect LED secondary light-distribution, improve the LED illumination uniformity with this, but existing this type of technical scheme makes repeatedly crossed reflex or refraction of light beam, luminous flux is subject to the decay of certain degree, affects the illumination performance of LED.The Chinese invention patent that wherein application publication number is CN102401319A discloses a kind of LED secondary optical lens, these lens have been used reflection to add two kinds of light paths of refraction and have been used in conjunction with to form square focus spot, light path complexity, and refractive light paths part has adopted non-spherical lens, this lens are generally resin lens or glass lens, if realize batch machining, no matter adopt resin lens or glass lens, all need to adopt mould to process, and to make different moulds for different lens size and lens curvature condition, number of molds is more, die cost costliness, the disclosed lens of this patent both sides are sphere and cylinder, can adopt grinding technology to make, and lens shape precision and surface roughness are all better than die sinking makes, and optics of lens performance is better, low processing cost, and small-scale and large-scale production are all suitable for.In the application of ultraviolet square focus spot, need adopting quartz glass, quartz glass fusing point is high simultaneously, can not adopt mould heat pressure technique to make, and this patent employing grinds mode and can avoid above-mentioned difficulties.

Utility model content

The purpose of this utility model is the shortcoming that overcomes prior art, a kind of LED lens that produce square focus spot are provided, be used in the front of LED light source, these LED lens only adopt refractive light paths, its light path and simple in structure, spotlight effect is good, form the square focus spot of uniform-illumination at shadow surface, hot spot is square with fillet, square focus spot has been removed circular light spot nonuseable part around, and be to adopt the mode that converges light, instead of employing is blocked or the mode of cutting, therefore it has the effect of saving luminous energy, capacity usage ratio is higher, thereby can effectively improve the utilization rate of light, reach energy-conservation object.The lens that design in present patent application, it before it, is the sphere grinding, the part cylinder of two orthogonal indents grinding below, sphere and cylinder are all most basic in lens processing, manufacture craft is simple, that the company that general optical mirror slip is processed can process, there is lower application threshold, therefore the lens that design in present patent application are convenient to processing, reduce costs, and can be applied to ultraviolet and infra-red range (while selecting glass lens as material also can batch machining).In addition,, when LED light source throws light on for engineering, often carry out luminous intensity distribution according to different use occasions or customer requirement.In some use occasions, such as stage searchlight, art exhibition Projecting Lamp, the polishing effect of museum exhibit Projecting Lamp, there is particular/special requirement for square focus spot, the edge illumination of ultra-violet curing medium ultraviolet light to some square crosses etc., the utility model can play the luminous intensity distribution effect that forms square focus spot.

For reaching above-mentioned purpose, the LED lens that the utility model provides have adopted following technical scheme:

Produce LED lens for square focus spot, be used in the front of LED chip, these lens have front surface, rear surface and side, and described front surface is a spherical calotte that is certain curvature, the aspherical shape that rear surface is indent;

Preferably, the aspherical shape of indent is intersected vertically and is formed by the part face of cylinder of two indents;

Preferably, LED chip includes but not limited to visible ray, infrared light, ultraviolet light, includes but not limited to monochromatic light, complex light simultaneously;

Preferably, the material of described LED lens includes but not limited to optical glass, quartz glass, PMMA plastic resin or PC plastic resin;

Preferably, the curvature of described spherical calotte is according to the difference of concrete light source and light path and lens material and difference;

Preferably, the curvature on the part face of cylinder of described indent is according to the difference of concrete light source and light path and lens material and difference;

Preferably, different with lighting angle according to the encapsulation of LED, LED lens or separately use, or be used in combination with other optical module, described other optical module plays the effect of converging light, and described LED lens play and form square focus spot effect;

Preferably, the part face of cylinder of described spherical calotte and/or described two indents comprises the face that grinds formation;

Preferably, described other optical lens is hemispherical optical lens, convex lens.

A kind of optical system, comprises LED light source, plane of illumination, and above-mentioned LED lens.

Brief description of the drawings

Fig. 1 is the lateral plan of the LED lens of generation square focus spot of the present utility model.

Fig. 2 is the rear surface process view of the LED lens of generation square focus spot of the present utility model.

Fig. 3 is the rear surface view of the LED lens of generation square focus spot of the present utility model.

Fig. 4 is the optical system side view that uses the LED lens of generation square focus spot of the present utility model.

Symbol description

1, LED lens rear surface; 2, LED lens front surface; 3, the part face of cylinder of the indent of horizontal direction; 4, the part face of cylinder of the indent of vertical direction.

Detailed description of the invention

In order more clearly to understand technology contents of the present utility model, describe in detail especially exemplified by following examples.

In Fig. 4, choosing package width is the LED spot light chip of w, place the hemispherical optical lens that radius is r at chip front end L1 place, the utility model lens are placed in position at lens front end L2, its rear surface is the part face of cylinder 3,4 (seeing Fig. 3) along the indent of the radius R 11 of two mutually perpendicular directions, its front surface is that curvature is the spherical calotte 2 (seeing Fig. 1) of R12, lens gross thickness is T1, place plane of illumination at the utility model LED lens front end L3 place, as optical screen.

Lens of the present utility model in Fig. 4 are changed, its rear surface is the part face of cylinder 3,4 (seeing Fig. 3) along the indent of the radius R 21 of two mutually perpendicular directions, its front surface is that curvature is the spherical calotte 2 (seeing Fig. 1) of R22, lens gross thickness is T2, place equally plane of illumination at the utility model lens front end L3 place, as optical screen.

Wherein, the manufacturing process of LED lens rear surface as shown in Figure 2, the mode grinding by ordinary lens, rear surface is worn into the part face of cylinder (in Fig. 2, the LED lens section branch of circular contour inside is worn away) of the indent of a certain radius, and then in perpendicular direction, grind the part face of cylinder of another identical indent, can form like this lens rear surface as shown in Figure 3.

In this description, the utility model is described with reference to as above two kinds of its specific embodiment.But, still can make various amendments and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, description and accompanying drawing are regarded in an illustrative, rather than a restrictive.

Claims

1. one kind produces the LED lens of square focus spot, be used in the front of LED chip, these lens have front surface, rear surface and side, described front surface is a spherical calotte that is certain curvature, it is characterized in that: the aspherical shape that described rear surface is indent, the aspherical shape of described indent is intersected vertically and formed by the part face of cylinder of two indents.

2. lens according to claim 1, is characterized in that: described LED chip comprises visible ray, infrared light, ultraviolet light, comprise monochromatic light, complex light simultaneously.

3. lens according to claim 1, is characterized in that: the curvature of described spherical calotte is according to the difference of concrete light source and light path and lens material and difference.

4. lens according to claim 1, is characterized in that: the curvature on the part face of cylinder of described indent is according to the difference of concrete light source and light path and lens material and difference.

5. lens according to claim 1, it is characterized in that: different with lighting angle according to the encapsulation of LED, described LED lens or separately use, or be used in combination with other optical module, described other optical module plays the effect of converging light, and described LED lens play and form square focus spot effect.

6. lens according to claim 1, is characterized in that: the part face of cylinder of described spherical calotte and/or described two indents comprises the face that grinds formation.

7. lens according to claim 5, is characterized in that: described other optical module is hemispherical optical lens, convex lens.

8. an optical system, is characterized in that: comprise LED light source, shone thing, and LED lens as described in any one in claim 1～7.