CN111043573A - Optical system for collimation of LED (light emitting diode) surface light source - Google Patents
Optical system for collimation of LED (light emitting diode) surface light source Download PDFInfo
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- CN111043573A CN111043573A CN201911423215.3A CN201911423215A CN111043573A CN 111043573 A CN111043573 A CN 111043573A CN 201911423215 A CN201911423215 A CN 201911423215A CN 111043573 A CN111043573 A CN 111043573A
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- lens
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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
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
- F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
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- 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
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
The invention discloses an optical system for collimation of an LED (light emitting diode) surface light source, belonging to the technical field of packaging and application of light emitting diodes. The system comprises a reflector, a first lens, a second lens and a third lens, wherein the first lens, the second lens and the third lens are fixed on the inner cavity surface of the reflector, and the whole system is rotationally symmetrical about the central axis of the whole system; large-angle light emitted by the LED surface light source is reflected by the outer paraboloid of the reflector and then emitted from the stepped plane, and small-angle light emitted by the LED surface light source is reflected by the first lens, the second lens and the third lens and then emitted; the total length of the optical system is 21.4mm, the light-emitting aperture is 40mm, the LED light source is placed 4.3mm in front of the center of the front surface of the first lens, and when the light-emitting area of the LED light source is 2mm multiplied by 2mm, the maximum divergence half angle of the collimated light beam is less than 3 degrees; the Fresnel loss and the material absorption are considered, and the light energy utilization rate can reach about 85%.
Description
The technical field is as follows:
the invention relates to an optical system for collimation of an LED (light emitting diode) surface light source, belonging to the technical field of packaging and application of light emitting diodes.
Background art:
the LED light source has the characteristics of small specific volume, high efficiency, quick response, wide color gamut range, long service life and the like, and is widely applied to the fields of projection display, backlight light sources, road illumination, photocuring 3D printing and the like. Since the spatial light intensity of most of the LED light sources is distributed in a Lambertian manner, the illuminance formed on the illuminated surface is rapidly attenuated with the increase of the exit angle, which is difficult to meet the actual requirement, and therefore, the secondary optical design of the LED light sources is required.
At present, there are many structures designed for LED collimation, for example, patent inventions with application publication numbers CN103162234A, CN103511982A, and CN104696884A, etc., the LED surface light source is basically designed as a point light source, when such a collimator is used for collimating LED surface light sources with 2mm × 2mm or 3mm × 3mm, the collimation effect is not ideal, the emitted light beam has a large divergence angle, and a free curved surface is introduced, which brings great difficulty to processing and manufacturing. Therefore, the optical system which is free of free-form surface and can be used for LED light source collimation with a large light-emitting surface is designed to have important application value.
Disclosure of Invention
Aiming at the problem that the existing LED light source collimator is generally designed based on a point light source so that the collimation effect of an LED surface light source is poor, the invention designs an optical system for LED surface light source collimation; the optical system has good collimation effect on the LED light source with a larger light emitting surface, when the size of the LED surface light source is 2mm multiplied by 2mm, the maximum divergence half angle of the emergent light beam is less than 3 degrees, and free curved surfaces are avoided, so that convenience is brought to processing and manufacturing.
In order to achieve the purpose, the invention adopts the following scheme:
an optical system for collimation of an LED (light-emitting diode) surface light source comprises a reflector made of PMMA (polymethyl methacrylate) material or PC (polycarbonate) material, a first lens, a second lens and a third lens, wherein the outer side of the reflector is a paraboloid, and the inner side of the reflector is provided with a step plane, an inner cavity surface and an inner spherical surface; the part of the light emitted from the LED light source and irradiated to the first lens is refracted by the first lens, the second lens and the third lens and then emitted, and the part of the light irradiated to the inner spherical surface is reflected by the outer paraboloid and then emitted from the step-shaped plane.
Preferably, the curvature radius R11 of the inner spherical surface of the reflector is 5.657mm, and the contour line of the outer parabolic surface of the reflector satisfies the following equation:
wherein k and b are coefficients of the equation, the k value of the equation is 0.0633, the b value is-3.95, and the value range of x is more than or equal to 7.9 and less than or equal to 20.
Preferably, the inner cavity surface of the reflector is composed of a cylindrical surface, a circular table surface and a circular ring surface, wherein the contact surface with the first lens is the circular table surface, the contact surface with the second lens is the cylindrical surface and the circular ring surface, the contact surface with the third lens is the cylindrical surface, and the rest surfaces are the circular table surfaces.
Preferably, the first lens has a first lens front surface and a first lens rear surface, the first lens front surface is spherical, the aperture d2 is 8mm, the spherical radius R15 is-27.226 mm, the first lens rear surface is spherical, the aperture d1 is 8.8mm, the spherical radius R16 is-6.093 mm, and the central thickness L2 of the first lens is 2 mm.
Preferably, the second lens has a second lens front surface and a second lens rear surface, the second lens front surface is spherical, the aperture d3 is 12mm, the spherical radius R17 is-25.809 mm, the second lens rear surface is spherical, the aperture d4 is 12.6mm, the spherical radius R18 is-9.844 mm, and the central thickness L4 of the second lens is 2 mm.
Preferably, the third lens has a third lens front surface and a third lens rear surface, the third lens front surface is spherical, the aperture d5 is 15.8mm, the spherical radius R19 is 14.827mm, the third lens rear surface is spherical, the aperture d5 is 15.8mm, the spherical radius R20 is 41.167mm, and the central thickness L6 of the third lens is 2 mm.
Preferably, the distance L1 between the LED surface light source and the center of the front surface of the first lens is 4.3mm, the distance L3 between the center of the rear surface of the first lens and the center of the front surface of the second lens is 2.0mm, and the distance L5 between the center of the rear surface of the second lens and the center of the front surface of the third lens is 2.0 mm.
Preferably, the glass material used for the first lens, the second lens and the third lens is domestic glass H-K9L, and the material used for the reflector 1 is PMMA (polymethyl methacrylate) or PC (polycarbonate).
The invention has the advantages that:
1. the collimation effect on the LED light source with a larger light emitting surface is good; the maximum divergence half-angle of the outgoing light beam is less than 3 degrees when the LED light emitting surface is 2mm × 2mm, and less than 4 degrees when the LED light emitting surface is 3mm × 3 mm.
2. Has no free curved surface and is friendly to processing and manufacturing.
3. The emergent light at all angles can be collimated, and the light energy utilization rate is high; the Fresnel loss and the material absorption are considered, and the light energy utilization rate can reach about 85%.
Drawings
FIG. 1 is a top three-dimensional perspective view of an optical system of the present invention
FIG. 2 is a bottom three-dimensional view of the optical system of the present invention
FIG. 3 is a schematic view of an optical system according to the present invention
FIG. 4 is a rotational profile of an optical system of the present invention
FIG. 5 is a schematic diagram of the dimensional parameters of the intermediate collimating lens portion of the optical system of the present invention
FIG. 6 is a light tracing simulation diagram of the optical system of the present invention for a 1mm × 1mm LED surface light source
Description of reference numerals: 1-reflector, 2-first lens, 3-second lens, 4-third lens, 11-inner spherical surface, 12-inner cavity surface, 13-outer paraboloid, 14-step plane, 15-first lens front surface, 16-first lens rear surface, 17-second lens front surface, 18-second lens rear surface, 19-third lens front surface, 20-third lens rear surface.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings:
the collimating optical system structure of the present invention is shown in fig. 1, fig. 2 and fig. 3, and is characterized in that: the LED collimating lens comprises a reflector 1, a first lens 2, a second lens 3 and a third lens 4, wherein the reflector 1 is provided with an outer paraboloid 13, a stepped plane 14, an inner cavity surface 12 and an inner spherical surface 11, the first lens 2, the second lens 3 and the third lens 4 are fixed on the inner cavity surface 12, an LED light source is arranged at the spherical center of the inner spherical surface 11, and the collimating optical system is rotationally symmetrical about the central axis of the collimating optical system.
The part of the light emitted from the LED light source and irradiated on the first lens 2 is refracted by the first lens 2, the second lens 3 and the third lens 4 and then emitted, and the part of the light irradiated on the inner spherical surface 11 is reflected by the outer paraboloid 13 and then emitted from the step-shaped plane 14.
In this embodiment, the curvature radius R11 of the inner spherical surface 11 of the reflector 1 is 5.657mm, and the contour line of the outer parabolic surface 13 thereof should satisfy the following equation:
y＝kx2+b
wherein k and b are coefficients of the equation, the k value of the invention is 0.0633, the b value is-3.95, and the main design parameters of the reflector 1 are shown in table 1.
TABLE 1 main design parameters of the reflectors
| k | b | R11(mm) | x(mm) |
| 0.633 | -3.95 | 5.657 | 7.9≤x≤20 |
In this embodiment, the inner cavity surface 12 of the reflector 1 is composed of a cylindrical surface, a circular table surface and a circular ring surface, wherein the contact surface with the first lens 2 is a circular table surface, the contact surface with the second lens 3 is a cylindrical surface and a circular ring surface, the contact surface with the third lens 4 is a cylindrical surface, and the rest surfaces are circular table surfaces.
In this embodiment, the first lens 2 has a first lens front surface 15 and a first lens rear surface 16, the first lens front surface 15 is a spherical surface, the aperture d2 is 8mm, the spherical radius R15 is-27.226 mm, the first lens rear surface 16 is a spherical surface, the aperture d1 is 8.8mm, the spherical radius R16 is-6.093 mm, the central thickness L2 of the first lens 2 is 2mm, and specific parameter values of the first lens 2 are shown in table 2.
TABLE 2 specific parameters of the first lens
| R15(mm) | R16(mm) | d1(mm) | d2(mm) | L2(mm) |
| -27.226 | -6.093 | 8.8 | 8.0 | 2.0 |
In this embodiment, the second lens 3 has a second lens front surface 17 and a second lens rear surface 18, the second lens front surface 17 is a spherical surface, the aperture d3 is 12mm, the spherical radius R17 is-25.809 mm, the second lens rear surface 18 is a spherical surface, the aperture d4 is 12.6mm, the spherical radius R18 is-9.844 mm, the central thickness L4 of the second lens 3 is 2mm, and specific parameter values of the second lens 3 are shown in table 3.
TABLE 3 specific parameters of the second lens
| R17(mm) | R18(mm) | d3(mm) | d4(mm) | L4(mm) |
| -25.809 | -9.844 | 12.0 | 12.6 | 2.0 |
In this embodiment, the third lens 4 has a third lens front surface 19 and a third lens rear surface 20, the third lens front surface 19 is a spherical surface, the aperture d5 is 15.8mm, the spherical radius R19 is 14.827mm, the third lens rear surface 20 is a spherical surface, the aperture d5 is 15.8mm, the spherical radius R20 is 41.167mm, the central thickness L6 of the third lens 4 is 2mm, and specific parameter values of the third lens 4 are shown in table 4.
TABLE 4 specific parameters of the third lens
| R19(mm) | R20(mm) | d5(mm) | L5(mm) |
| 14.827 | 41.167 | 15.8 | 2.0 |
In this embodiment, the distance L1 between the LED surface light source and the center of the front surface 15 of the first lens 2 is 4.3mm, the distance L3 between the center of the rear surface 16 of the first lens 2 and the center of the front surface 17 of the second lens 3 is 2.0mm, and the distance L5 between the center of the rear surface 18 of the second lens 3 and the center of the front surface 19 of the third lens 4 is 2.0mm, and specific parameters are shown in table 5.
TABLE 5 position parameters of the lens in axial direction
| L1(mm) | L3(mm) | L5(mm) |
| 4.3 | 2.0 | 2.0 |
In this embodiment, the glass material used for the first lens 2, the second lens 3, and the third lens 4 is domestic glass H-K9L, and the material used for the reflector 1 is PMMA or PC.
The embodiment designs an optical system for collimating an LED surface light source; when the luminous area of the LED light source is 2mm multiplied by 2mm, the maximum divergence half angle of the collimated light beam is less than 3 degrees, and when the luminous area of the LED light source is 3mm multiplied by 3mm, the maximum divergence half angle of the collimated light beam is less than 4 degrees; the collimating lens can collimate emergent light at all angles, has high light energy utilization rate, and can reach about 85 percent by considering Fresnel loss and material absorption.
The technical index of the optical system is shown in table 6, and the specific design parameters of the optical system are shown in tables 7, 8, 9, 10 and 11.
TABLE 6 technical index of optical system
TABLE 7 main design parameters of the reflectors
| k | b | R11(mm) | x(mm) |
| 0.633 | -3.95 | 5.657 | 7.9≤x≤20 |
TABLE 8 specific parameters of the first lens
| R15(mm) | R16(mm) | d1(mm) | d2(mm) | L2(mm) |
| -27.226 | -6.093 | 8.8 | 8.0 | 2.0 |
TABLE 9 specific parameters of the second lens
| R17(mm) | R18(mm) | d3(mm) | d4(mm) | L4(mm) |
| -25.809 | -9.844 | 12.0 | 12.6 | 2.0 |
TABLE 10 specific parameters of the third lens
| R19(mm) | R20(mm) | d5(mm) | L5(mm) |
| 14.827 | 41.167 | 15.8 | 2.0 |
TABLE 11 positional parameters of the lens in the axial direction
| L1(mm) | L3(mm) | L5(mm) |
| 4.3 | 2.0 | 2.0 |
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. An optical system for collimation of an LED surface light source is characterized by comprising a reflector made of PMMA (polymethyl methacrylate) material or PC (polycarbonate) material, a first lens, a second lens and a third lens, wherein the outer side of the reflector is a paraboloid, and the inner part of the reflector is provided with a step-shaped plane, an inner cavity surface and an inner spherical surface; the part of the light emitted from the LED light source and irradiated to the first lens is refracted by the first lens, the second lens and the third lens and then emitted, and the part of the light irradiated to the inner spherical surface is reflected by the outer paraboloid and then emitted from the step-shaped plane.
2. An optical system for collimation of an LED area light source as claimed in claim 1, wherein the curvature radius R11 of the inner spherical surface of the reflector is 5.657mm, and the contour line of the outer parabolic surface of the reflector satisfies the following equation:
y＝kx2+b
wherein k and b are coefficients of the equation, the k value of the equation is 0.0633, the b value is-3.95, and the value range of x is more than or equal to 7.9 and less than or equal to 20.
3. The optical system for collimation of an LED area light source as claimed in claim 1, wherein the inner cavity surface of the reflector is composed of a cylindrical surface, a circular table surface and a circular ring surface, wherein the contact surface with the first lens is a circular table surface, the contact surface with the second lens is a cylindrical surface and a circular ring surface, the contact surface with the third lens is a cylindrical surface, and the rest surfaces are circular table surfaces.
4. An optical system for collimation of an LED area light source as recited in claim 1, wherein the first lens has a first lens front surface and a first lens back surface, the first lens front surface is spherical, the aperture d2 is 8mm, the spherical radius R15 is-27.226 mm, the first lens back surface is spherical, the aperture d1 is 8.8mm, the spherical radius R16 is-6.093 mm, and the central thickness L2 of the first lens is 2 mm.
5. An optical system for collimation of an LED area light source as recited in claim 1, wherein the second lens has a second lens front surface and a second lens rear surface, the second lens front surface is spherical, the aperture d3 is 12mm, the spherical radius R17 is-25.809 mm, the second lens rear surface is spherical, the aperture d4 is 12.6mm, the spherical radius R18 is-9.844 mm, and the central thickness L4 of the second lens is 2 mm.
6. An optical system for collimation of an LED area light source as recited in claim 1, wherein the third lens has a third lens front surface and a third lens back surface, the third lens front surface is spherical, the aperture d5 is 15.8mm, the spherical radius R19 is 14.827mm, the third lens back surface is spherical, the aperture d5 is 15.8mm, the spherical radius R20 is 41.167mm, and the center thickness L6 of the third lens is 2 mm.
7. An optical system for collimation of an LED area light source as claimed in claim 1, wherein the distance L1 between the LED area light source and the center of the front surface of the first lens is 4.3mm, the distance L3 between the center of the rear surface of the first lens and the center of the front surface of the second lens is 2.0mm, and the distance L5 between the center of the rear surface of the second lens and the center of the front surface of the third lens is 2.0 mm.
8. The optical system for collimating an LED area light source as claimed in claim 1, wherein the glass material used for the first lens, the second lens and the third lens is domestic glass H-K9L, and the material used for the reflector 1 is PMMA (polymethyl methacrylate) or PC (polycarbonate).
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| CN201911423215.3A CN111043573B (en) | 2019-12-31 | 2019-12-31 | Optical system for collimation of LED (light emitting diode) surface light source |
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| CN201911423215.3A CN111043573B (en) | 2019-12-31 | 2019-12-31 | Optical system for collimation of LED (light emitting diode) surface light source |
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| CN111043573B CN111043573B (en) | 2022-02-15 |
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| US20100157434A1 (en) * | 2008-12-23 | 2010-06-24 | Samsung Electronics Co., Ltd. | Collimate lens assembly |
| CN103900026A (en) * | 2014-04-21 | 2014-07-02 | 江南大学 | COB type LED light gathering TIR lens system and designing method |
| CN104090356A (en) * | 2014-07-16 | 2014-10-08 | 山东理工大学 | Optical system used for collimation of 1 mm*1 mm LED light source |
| CA2945846A1 (en) * | 2014-04-16 | 2015-10-22 | Hangzhou Great Star Tools Co., Ltd. | Lens and lens system and uses thereof |
| CN105449372A (en) * | 2015-12-17 | 2016-03-30 | 华南理工大学 | Optical antenna based on visible light communication |
| US20160131330A1 (en) * | 2010-04-08 | 2016-05-12 | Ledengin, Inc. | Hybrid lens system incorporating total internal reflection lens and diffuser |
| US20160230953A1 (en) * | 2015-02-10 | 2016-08-11 | CentraLED Technology Ltd. | Zoom spotlight |
-
2019
- 2019-12-31 CN CN201911423215.3A patent/CN111043573B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100157434A1 (en) * | 2008-12-23 | 2010-06-24 | Samsung Electronics Co., Ltd. | Collimate lens assembly |
| US20160131330A1 (en) * | 2010-04-08 | 2016-05-12 | Ledengin, Inc. | Hybrid lens system incorporating total internal reflection lens and diffuser |
| CA2945846A1 (en) * | 2014-04-16 | 2015-10-22 | Hangzhou Great Star Tools Co., Ltd. | Lens and lens system and uses thereof |
| CN103900026A (en) * | 2014-04-21 | 2014-07-02 | 江南大学 | COB type LED light gathering TIR lens system and designing method |
| CN104090356A (en) * | 2014-07-16 | 2014-10-08 | 山东理工大学 | Optical system used for collimation of 1 mm*1 mm LED light source |
| US20160230953A1 (en) * | 2015-02-10 | 2016-08-11 | CentraLED Technology Ltd. | Zoom spotlight |
| CN105449372A (en) * | 2015-12-17 | 2016-03-30 | 华南理工大学 | Optical antenna based on visible light communication |
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