CN104456420B - A kind of convex lens for downlight light distribution - Google Patents

A kind of convex lens for downlight light distribution Download PDF

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Publication number
CN104456420B
CN104456420B CN201410777030.3A CN201410777030A CN104456420B CN 104456420 B CN104456420 B CN 104456420B CN 201410777030 A CN201410777030 A CN 201410777030A CN 104456420 B CN104456420 B CN 104456420B
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China
Prior art keywords
convex lens
refractive curvature
outgoing
inequality
light source
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CN201410777030.3A
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CN104456420A (en
Inventor
孙勇
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JIANGMEN CITY TIANJIALI LIGHTING Co Ltd
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JIANGMEN CITY TIANJIALI LIGHTING Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2101/00—Point-like light sources

Abstract

A kind of convex lens for downlight light distribution of the present invention, bent including incident refractive curvature and outgoing refraction, incident refractive curvature is inner concave shape, and incident refractive curvature is a part for ellipsoid, is located at the bottom of convex lens；Outgoing refractive curvature is male type, and outgoing plane of refraction is a paraboloidal part, is located at the top of convex lens；There is a retainer ring in the bottom outer ring of convex lens.Present invention aims at provide a kind of convex lens that is efficient, at low cost, having downlight light-configuration mode, it can realize light distribution of the lens to multiple low-power LED light sources, and can be adapted for COB light source, there is stronger versatility, facilitate model change；Its with plurality of LEDs light source in use, light source concentrate welding in the case of, the convex lens can as far as possible reduction materials'use amount, reduce lamps and lanterns cost；It can be more accurate compared with diffuser plate control distribution curve flux, the Luminaire efficiency of whole lamp can be improved.

Description

A kind of convex lens for downlight light distribution
Technical field
The present invention relates to lighting technical fields, particularly a kind of lens for LED downlight light distribution.
Background technology
Current LED downlight is generally used for basic illumination, so the scope of its irradiation is bigger, so light distribution angle It is bigger, so most downlight all adds one piece of diffuser plate using the light-emitting window in lamps and lanterns, to reach a wide range of Uniform Illumination Purpose, and downlight generally using the LED of more middle low powers as light source, if saturating all with one to each LED light source Mirror carries out light distribution, it would be desirable to which more lenslets form lens module, so can undoubtedly increase cost.So current LED downlight Secondary light-distribution is carried out to light source using diffuser plate to seem to become optimal case.But but had using diffuser plate progress light distribution following Several point defects：
One in order to achieve the purpose that Uniform Illumination and reduce light-source brightness, and the mist degree of diffuser plate is generally all bigger, but this So that the light transmittance of diffuser plate is all very low, so causing the Luminaire efficiency of whole lamp relatively low, in order to make up this defect, some cylinders Lantern festival uses reflective sheeting, to improve Luminaire efficiency, but can so increase the cost of entire lamps and lanterns.
Two because of the reason for having added diffusant in diffuser plate, and light can be diffused after diffuser plate toward all directions, Diffusing transmission is formed, the direction of beam projecting has toward all directions, so in wide-angle direction, is come out from diffuser plate diffusing transmission Light also can be bigger, so in actual illumination application, dazzle can be caused in the direction of wide-angle.As shown in Figure 1, it is general Using the distribution curve flux of the downlight of diffuser plate, it can be seen that the light intensity in wide-angle direction is stronger.Part downlight is dizzy in order to eliminate Light, and increase the structure of a shading, although can achieve the purpose that anti-dazzle, reduce luminous flux.
After although three using diffuser plate, the mesh that light distribution is carried out to plurality of LEDs light source can be realized with one piece of diffuser plate , avoid the high cost approach of the lens module using more lenslets composition.Although in small-bore downlight, one piece of expansion That falls apart is inexpensive.But with the increasing of downlight size, the radius of light-emitting window also increases, the size of required diffuser plate Increase, the cost of diffuser plate also improve therewith.
Four use diffuser plate, although can achieve the purpose that Uniform Illumination, diffuser plate can not accurately control light System, the light distribution formed are but not necessarily efficiency highest, the light-configuration mode of optimization.,
As seen from the above analysis, although LED downlight carries out the very extensive of light distribution application using diffuser plate at present, Still there are the defects of many and the place having much room for improvement.
The content of the invention
It is an object of the invention to overcome the shortcomings of present in the prior art, for current LED downlight using diffuser plate into Row light distribution, and cause Luminaire efficiency relatively low, dazzle can not be eliminated in wide-angle direction, light distribution can not be controlled accurately etc. and lacked It falls into, a kind of convex lens that is efficient, at low cost, having downlight light-configuration mode is provided.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions：
A kind of convex lens for downlight light distribution, including incident refractive curvature, outgoing refractive curvature, it is characterised in that：Institute Incident refractive curvature is stated as inner concave shape, incident refractive curvature is a part for ellipsoid, is located at the bottom of the convex lens；Institute It is male type to state outgoing refractive curvature, and outgoing plane of refraction is a paraboloidal part, is located at the top of the convex lens；It is incident The concave lens body of a thick middle thin edge is formed between refractive curvature and outgoing plane of refraction.
Using convex lens longitudinal cross-section as plane, the straight of abscissa x and ordinate y is established by origin of convex lens bottom centre Angular coordinate；
It is described incidence refractive curvature indulge section shape into incidence curves meet following equation：
x2/a2+(y+m)2/b2=1, a, b, m meet following three inequality：
Inequality 1：0<m<B,
Inequality 2：b-m>h,
Inequality 3：a2-a2m2/b2>R2
Wherein：H is matched somebody with somebody the height of LED light source by convex lens, and R is matched somebody with somebody the radius of light source by convex lens；
It is described outgoing refractive curvature indulge section shape into outgoing curve meet following equation：
x2=-4p (y-g), p and g meet following two inequality：
Inequality 4：g>H,
Inequality 5: 4pg> a2-a2m2/b2,
Wherein, p is half of its focal point to directrix distance, and g is the height of entire convex lens.
Wherein, p, g can be carried out in the case where meeting such as upper inequality according to the required size and distribution curve flux of lens Selection.
Further, convex lens bottom sides have the retainer ring of integral structure.
Further, convex lens is rotationally symmetric body.
Further, convex lens uses polymethyl methacrylate（PMMA）The integral structure that material injection forms.
Further, incident refractive curvature is frosting.
Compared with prior art, beneficial effects of the present invention have the following：
1st, convex lens is rotationally symmetric body, and the part that incident refractive curvature is ellipsoid, outgoing plane of refraction are parabolic The part in face, concavo-convex doublet lens incidence, the exit surface cooperation of gradual change so that the present invention can realize a lens to more The light distribution of a low-power LED light source, and can be adapted for COB light source, there is stronger versatility, product renewing is facilitated to change Generation；And with plurality of LEDs light source in use, can by multiple light sources concentrate weld and be contained in the bottom position of indent, relatively The reduction materials'use amount that can be tried one's best for single source individually prepares lens, reduces lamps and lanterns cost.
2nd, convex lens is rotationally symmetric body, and the part that incident refractive curvature is ellipsoid, outgoing plane of refraction are parabolic The part in face, the concavo-convex doublet lens surface engagement of gradual change so that the control that the present invention can be more accurate compared with diffuser plate Distribution curve flux, Uniform Illumination when can not only realize using diffuser plate, while reduce the dazzle in wide-angle direction；And its light transmission Rate is higher, can improve the Luminaire efficiency of whole lamp.
3rd, convex lens is rotationally symmetric body, and the one that convex lens is molded using polymethyl methacrylate materials is tied Structure, it is easy to make, it is at low cost.
Description of the drawings
Fig. 1 is distribution curve flux of the general LED downlight using the downlight of diffuser plate；
Fig. 2 is the side view of the present invention；
Fig. 3 is the front view of the present invention；
Fig. 4 is the sectional view of the convex lens of the present invention；
Fig. 5 is the distribution curve flux of downlight using the present invention.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments, but is not that the present invention is tied The restriction of structure.
Referring to Fig. 4, its sectional view for the convex lens of the present invention.Convex lens 1 of the present invention, including being located at convex lens The inner concave shape incidence refractive curvature 12 of 1 bottom of mirror and the male type outgoing refractive curvature 11 positioned at 1 top of convex lens, incidence refraction The concave lens body of a thick middle thin edge is formed between curved surface 12 and outgoing plane of refraction 11.
Convex lens 1 is rotationally symmetric body, and rotation axis is Z axis, and retainer ring 13 is located at the bottom sides of convex lens 1.It is incident Refractive curvature 12 is a part for ellipsoid, as shown in figure 4, using convex lens longitudinal cross-section as plane, with convex lens bottom centre 0 For origin, the rectangular co-ordinate of abscissa x and ordinate y are established；
Incident refractive curvature indulge section shape into incidence curves meet following equation：x2/a2+(y+m)2/b2=1, wherein, a, B, m meet following three inequality：
Inequality 1：0<m<B,
Inequality 2：b-m>h,
Inequality 3：a2-a2m2/b2>R2 。
Wherein：H is matched somebody with somebody the height of LED light source by convex lens, and R is matched somebody with somebody the radius of light source by convex lens,
Wherein a, b, m are meeting as in the case of upper inequality, can according to the required sizes of lens and distribution curve flux into Row selection.
It is described outgoing plane of refraction 11 be a paraboloidal part, outgoing refractive curvature 11 indulge section shape into outgoing curve meet Following equation： x2=-4p (y-g),
Wherein, p and g meets following two inequality：
Inequality 4：g>H,
Inequality 5: 4pg> a2-a2m2/b2,
Wherein, p is half of its focal point to directrix distance, and g is the height of entire convex lens.
Wherein, p, g can be carried out in the case where meeting such as upper inequality according to the required size and distribution curve flux of lens Selection.
Fig. 2 and Fig. 3 are referred to, incident refractive curvature 12 and outgoing refractive curvature 11 are to be distributed as its busbar around central shaft Z Axis rotates.
Referring to Fig. 5, being distribution curve flux after applying the present invention, comparison uses the light distribution of the LED downlight of diffuser plate light distribution （Refering to Fig. 1）, it can be seen that using concave-convex aspheric entry, outgoing curved surface, equally realize and uniformly shine on a large scale It is bright, while the light intensity in wide-angle direction will reduce, and reduce the dazzle of the direction, while control the light distribution in wide-angle direction down Face is irradiated, and to improve the brightness value on ground, while in the case where ensureing the low dazzle value in wide-angle direction, while ensures wide-angle The certain light intensity value in direction, to ensure the illumination of vertical plane.
The invention is not limited in the above embodiment, if the various changes or deformation to the present invention do not depart from the present invention Spirit and scope, if these changes and deformation belong within the scope of the claim and equivalent technologies of the present invention, then this hair Bright intention is also comprising these changes and deformation.

Claims (1)

1. a kind of convex lens for downlight light distribution, including incident refractive curvature, outgoing refractive curvature, it is characterised in that：It is described Incident refractive curvature is inner concave shape, and incident refractive curvature is a part for ellipsoid, is located at the bottom of the convex lens；It is described Outgoing refractive curvature is male type, and outgoing plane of refraction is a paraboloidal part, is located at the top of the convex lens；Incidence folding It penetrates between curved surface and outgoing plane of refraction and forms the concave lens body of a thick middle thin edge；Using convex lens longitudinal cross-section as plane, with Convex lens bottom centre establishes the rectangular co-ordinate of abscissa x and ordinate y for origin；
It is described incidence refractive curvature indulge section shape into incidence curves meet following equation：
x2/a2+(y+m)2/b2=1, a, b, m meet following three inequality：
Inequality 1：0<m<B,
Inequality 2：b-m>h,
Inequality 3：a2-a2m2/b2>R2
Wherein：H is matched somebody with somebody the height of LED light source by convex lens, and R is matched somebody with somebody the radius of light source by convex lens；
Using convex lens longitudinal cross-section as plane, the right angle that abscissa x and ordinate y is established using convex lens bottom centre as origin is sat Mark；
It is described outgoing refractive curvature indulge section shape into outgoing curve meet following equation：
x2=-4p (y-g), p and g meet following two inequality：
Inequality 4：g>H,
Inequality 5:4pg>a2-a2m2/b2,
Wherein, p is half of its focal point to directrix distance, and g is the height of entire convex lens；
The convex lens bottom sides have the retainer ring of integral structure；
The convex lens is rotationally symmetric body；
The convex lens uses the integral structure that polymethyl methacrylate materials are molded；
The incidence refractive curvature is frosting；
The brightness value that the convex lens matches somebody with somebody LED light source is less than or equal to 350 candelas per square meter.
CN201410777030.3A 2014-12-17 2014-12-17 A kind of convex lens for downlight light distribution Active CN104456420B (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105423144A (en) * 2015-12-17 2016-03-23 中山市忆初照明电器有限公司 Light emitting structure of LED lamp
CN107917363B (en) * 2016-10-10 2020-09-15 广州达森灯光股份有限公司 Lens of fish gathering lamp and fish gathering lamp
CN107477478B (en) * 2017-09-28 2023-06-30 欧普道路照明有限公司 Lighting device
CN110425494A (en) * 2019-09-05 2019-11-08 杭州昌松光学有限公司 A kind of high evenness LED lens mould group, light emitting structure and lamps and lanterns
WO2021198539A1 (en) * 2020-04-02 2021-10-07 Antares Iluminación, S.A.U. Luminaire
CN111637423B (en) * 2020-05-28 2023-06-23 深圳市海洋王铁路照明技术有限公司 Lens, light distribution module and lamp
CN112325184B (en) * 2020-08-06 2022-10-25 海洋王照明科技股份有限公司 Light distribution lens and illuminating lamp with same

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN201535478U (en) * 2009-09-29 2010-07-28 东莞巨扬电器有限公司 LED lens
CN102537842A (en) * 2012-01-16 2012-07-04 华中科技大学 Deign method of light-type controllable lens with double freeform surfaces

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CN204005735U (en) * 2014-06-27 2014-12-10 五邑大学 Wide-angle uniform light distribution LED bulb lamp lens
CN204285313U (en) * 2014-12-17 2015-04-22 江门市天加力照明有限公司 A kind of convex lens for Down lamp luminous intensity distribution

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN201535478U (en) * 2009-09-29 2010-07-28 东莞巨扬电器有限公司 LED lens
CN102537842A (en) * 2012-01-16 2012-07-04 华中科技大学 Deign method of light-type controllable lens with double freeform surfaces

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