CN102901041B - LED (Light-Emitting Diode) lens and LED lamp provided with same - Google Patents
LED (Light-Emitting Diode) lens and LED lamp provided with same Download PDFInfo
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- CN102901041B CN102901041B CN201110213728.9A CN201110213728A CN102901041B CN 102901041 B CN102901041 B CN 102901041B CN 201110213728 A CN201110213728 A CN 201110213728A CN 102901041 B CN102901041 B CN 102901041B
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Abstract
The invention relates to an LED (Light-Emitting Diode) lens and an LED lamp provided with the same. The LED lens is provided with a top end face, a bottom end face and a rotary side face, wherein the bottom end face is provided with a semispherical concave spherical face; a conical concave face is arranged in the middle of the top end face; the generatrix of the rotary side face is a folding line; and the folding line comprises five straight-line sections which are connected in sequence. The LED lamp is provided with the LED lens. The bottom end face of the LED lens is provided with the concave spherical face and the top end face is provided with the conical concave face; light of a smaller light-emitting angle of an LED light source is refracted by the concave spherical face and the light-emitting angle is amplified for the first time; after the light is refracted by the conical concave face of the top face, the light-emitting angle is amplified for the second time; after the second time of amplification, stronger light which is close to an axis part is dispersed to the periphery, so that the problem that the strength of the light which is close to the axis part of the LED light source is greater is solved, and the more uniform floodlight light distribution can be realized.
Description
Technical field
The present invention relates to the light-distribution lens of lighting, more particularly, relate to a kind of LED lens and there is the LED lamp of these lens.
Background technology
When adopting LED light source to carry out floodlighting, general employing reflector carries out luminous intensity distribution to LED light source, but the light distribution effect of this mode is not very desirable, this is because, the beam intensity ratio of the axial ray part of LED light source is larger, but this part light is not by reflector luminous intensity distribution, the therefore floodlight allotted of reflector, the light intensity that always there will be mid portion is higher.
In order to obtain comparatively uniform floodlight luminous intensity distribution, also have and adopt concavees lens to carry out luminous intensity distribution to LED light source, but the utilization rate of this mode to the luminous flux of LED light source is lower, show that the light that the light emitting anger of LED light source is larger cannot be utilized, finally cause the light efficiency utilization rate of light fixture too low.
In addition, also has a class floodlight total-reflection lens, improve on the basis of the optically focused total reflection lens of LED light source, as shown in Figure 1, make densely covered netted small salient point or concave spherical surface structure to realize the effect of floodlight at the exit facet 1 of lens, also have and adopt exit facet frosted process, the floodlight effect that these processing modes reach is even all not, floodlight angle is general less, and due to the exit facet of frosting or class frosted, makes light loss.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of the flood lens of prior art, provides the LED lens that a kind of light distribution effect is good, light loss is little, and the lensed LED lamp of tool.
An object of the present invention is to provide a kind of LED lens, for the luminous intensity distribution of LED light source, it is characterized in that, described LED lens are revolving body, and described LED lens have a top end face and a bottom face, and connects the revolution side of described top end face and bottom face;
Described bottom face is provided with hemispheric concave spherical surface, and the centre of sphere of described hemispheric concave spherical surface is positioned on the axis of described revolving body;
The middle part of described top end face is provided with conical concave surface, the axis of described conical concave surface and the dead in line of described revolving body;
If the angle of the axis of the bus of described concave surface and described revolving body is θ, the summit of concave surface is L to the distance of bottom face, the refractive index of the material of described LED lens is n, top end face is h to the distance of bottom face, then θ and L meets following relation: θ=90-α (η-1)/(n-1), L≤(1-tan α/tan θ) × h, wherein, α ≈ 15 °, 1.8≤η≤1.9, η > n;
Described revolution side is fully reflecting surface, the bus of revolution side is broken line, described broken line comprises five straightways be connected successively, with the center of described bottom face for initial point, with the axis of revolving body for Z axis, with the symmetry axis of bottom face for Y-axis, when setting up Descartes's rectangular coordinate system, the starting point coordinate of described bus is (0, d/2, 0), wherein d is greater than the diameter of described LED light source, every bar straightway of described bus and the angle of Z axis are 3 ~ 45 °, every bar straightway of described bus and the angle of Z axis successively decrease in the sequence of positions of bus by origin-to-destination successively according to this straightway, every starting point of bar straightway of described bus and the angle of the terminal of the line of initial point and this straightway and the line of initial point are 5 ~ 15 °.
In LED lens of the present invention, every bar straightway of described bus and the angle of Z axis are followed successively by 43.5 °, 33.5 °, 23.5 °, 13.5 °, 3.5 ° at described bus by the sequence of positions of origin-to-destination according to this straightway.
In LED lens of the present invention, every starting point of bar straightway of described bus and the angle of the terminal of the line of initial point and this straightway and the line of initial point are 10 °.
In LED lens of the present invention, described d 3 ~ 5mm larger than the diameter of LED light source.
In LED lens of the present invention, described revolution side is provided with and increases anti-film.
In LED lens of the present invention, described LED lens are made up of optical glass or optical plastic.
In LED lens of the present invention, the refractive index of described optical glass or optical plastic is greater than 1.45.
In LED lens of the present invention, described optical plastic is Merlon or polymethyl methacrylate.
Two of object of the present invention is to provide a kind of LED lamp, at least comprise LED light source, and LED lens as previously discussed, described LED light source just to the concave spherical surface on described LED lens bottom face, the optical axis of described LED light source and the dead in line of described LED lens.
Implement LED lens of the present invention and there is the LED lamp of these lens, there is following beneficial effect: the bottom face of LED lens of the present invention is provided with concave spherical surface, top end face is provided with conical concave surface, the less light of the light emitting anger of LED light source is after concave spherical surface refraction, light emitting anger is amplified for the first time, after the conical concave surface refraction of end face, light emitting anger is amplified for the second time, amplify through secondary, the comparatively high light alignment surrounding diffusion of axial ray part, the light that light emitting anger is larger is then totally reflected backward axis by revolution side and draws close, solve the problem that the light intensity of the axial ray part of LED light source is larger, more uniform floodlight luminous intensity distribution can be realized.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the schematic diagram of the LED lens of prior art;
Fig. 2 is the schematic diagram of the preferred embodiment of LED lens of the present invention;
Fig. 3 is the schematic diagram of the end face of the preferred embodiment of LED lens of the present invention;
Fig. 4 is the sectional view of the preferred embodiment of LED lens of the present invention;
Fig. 5 is the schematic diagram of the revolution side of the preferred embodiment of reflective total reflection lens of the present invention;
Fig. 6 is the light path schematic diagram of the luminous intensity distribution of LED lens of the present invention;
Fig. 7 is the light distribution effect schematic diagram of LED lens of the present invention.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
As shown in Figures 2 to 5, be the schematic diagram of a preferred embodiment of LED lens of the present invention, these LED lens are a kind of floodlight total-reflection lens, and these LED lens 10 are for the luminous intensity distribution of LED light source 30.As shown in the figure, these LED lens 10 are single-revolution body, and it is made up of transparent material, can be such as optical plastic or optical glass, the refractive index of transparent material be preferably greater than 1.45, in the present embodiment, these LED lens are made up of Merlon, and be also PC material, its refractive index is 1.59.
These LED lens 10 have top end face 11 and a bottom face 12, and connect the revolution side 13 of top end face 11 and bottom face 12, and revolution side 13 is fully reflecting surface.In the LED lens of the present embodiment, the bus 14 of the revolution side 13 of LED lens 10 is broken line, and this broken line comprises five straightways 21,22,23,24,25 be connected successively.The parameter of bus 14 has to be determined with under type, with the center of bottom face 12 for initial point 0, with the axis of revolving body and LED lens 10 for Z axis, with the symmetry axis of bottom face 12 for Y-axis, set up Descartes's rectangular coordinate system, the starting point coordinate of bus 14 is (0, d/2, 0), wherein d is greater than the diameter of described LED light source, every bar straightway of bus 14 and the angle of Z axis are 3 ~ 45 °, every bar straightway of bus 14 and the angle of Z axis successively decrease in the sequence of positions of bus 14 by origin-to-destination successively according to this straightway, every starting point of bar straightway of described bus 14 and the angle of the terminal of the line of initial point and this straightway and the line of initial point are 5 ~ 15 °.
Concrete, in the present embodiment, article five, straightway is followed successively by the first straightway 21, second straightway 22, 3rd straightway 23, 4th straightway 24, 5th straightway 25, as shown in Figure 5, the starting point of bus 14, also namely the starting point coordinate of the first straightway 21 is (0, d/2, 0), in the present embodiment, d=8mm, the diameter of the LED light source 30 coordinated with the LED lens 10 of the present embodiment is not more than 5mm, here, the diameter of LED light source 30 refers to the diameter of the light-emitting area 31 of LED light source 30, d is advisable with the diameter 3 ~ 5mm being greater than LDE light source 30, unsuitable excessive.
In the present embodiment, every starting point of bar straightway of bus 14 and the angle of the terminal of the line of initial point and this straightway and the line of initial point are 10 °, first straightway 21 is 43.5 ° with the angle of Z axis, second straightway 22 is 33.5 ° with the angle of Z axis, 3rd straightway 23 is 23.5 ° with Z axis angle, 4th straightway 24 is 13.5 ° with Z axis angle, and the 5th straightway 25 is 3.5 ° with Z axis angle.By the angle of the starting point of the first straightway 21, the starting point of the first straightway 21 and the line of the line of initial point and the terminal of this straightway and initial point and the first straightway 21 angle with Z axis, these three parameters decide the coordinate of the terminal can determining the first straightway 21, also the coordinate of the starting point of the second straightway 22 is namely determined, the like namely can determine starting point and the terminal of every bar straightway, also namely determine Down Highway 14, bus 14 rotates a circle around Z axis and can obtain turning round side 13.The shape of LED lens 10 can be determined by above-mentioned parameter.In order to improve the utilization rate of light further, on revolution side 13, plating anti-film can be increased, to improve the efficiency of reflection.
In the present embodiment, the bottom face 12 of LED lens 10 is provided with hemispheric concave spherical surface 121, and the centre of sphere of this hemispheric concave spherical surface 121 is positioned on the axis that revolving body is also LED lens 10; Be provided with conical concave surface 111 at the middle part of top end face 11, the axis of this conical concave surface 111 and revolving body are also the dead in line of LED lens 10; If the angle of this conical bus of concave surface 111 and the axis of revolving body is θ, the summit of concave surface 111 and vertex of a cone position are L to the distance of bottom face 12, the refractive index of the material of LED lens 10 is n, and top end face 11 is h to the distance of bottom face 12, then θ and L meets following relation:
θ＝90-α(η-1)/(n-1)， (1)
L≤(1-tanα/tanθ)×h， (2)
Wherein, α ≈ 15 °, 1.8≤η≤1.9, η > n.
Both can have been determined the parameter of LED lens by above parameter, the parameter of the preferred embodiment of the LED lens of the present embodiment is as follows:
The diameter of concave spherical surface 121: 5mm;
The diameter d of the bottom face 12 of LED lens 10: 8mm;
The conical bus of concave surface 111 and the angle theta of axis: 70 °;
The summit of conical concave surface 111 is to the distance L:7.5mm of end face 12;
Top end face 11 is to the distance h:8.5mm of bottom face 12
The diameter of top end face 11: 14mm;
As can be seen from above parameter, the institute of these LED lens 10 takes up space and is 14mm × 14mm × 8.5mm to the maximum, and volume is very little.
Fig. 6 shows the light path schematic diagram of the luminous intensity distribution of LED lens 10 of the present invention, first time refraction is there is when the light of the part of the axis of LED light source 30 enters lens by concave spherical surface 121, then by the injection after second time refraction of conical concave surface 111, after twice refraction, the angle of light and axis is exaggerated; The light of the part slightly large with the axis angle of LED light source 30 occurs when entering lens by concave spherical surface 121 to reflect for the first time, then by planar section injection after second time refraction of top end face 11, after twice refraction, the angle of this part light and axis is also exaggerated; First time refraction is there is in the light departing from the axis portion of LED light source 30 further when entering lens by concave spherical surface 121, then directive revolution side 13, directive top end face 11 injection after second time refraction after total reflection occurs in revolution side 13, this some light is after experience first time refraction, total reflection, second time refraction, and light penetrates to offside by penetrating to change into direction, axis side; Above-mentioned three some light are the injection in interleaved mode after LED lens, due to being exaggerated with the angle of axis of stronger light of the close axis portion of LED light source 30, the comparatively high light alignment surrounding diffusion of axial ray part, and intersect with the light in other regions and mix, so just can obtain good Architecture Floodlighting, and the light sent due to LED light source 30 regional can be fully utilized, and improves the utilization ratio of light.As shown in Figure 7, as seen from the figure, in the scope that light emitting anger is 60 °, uniformity of illuminance is very high for the light distribution effect of LED lens 10 of the present invention.
The present invention is except providing above-mentioned LED lens, also provide a kind of LED lamp, this LED lamp at least comprises LED light source 30, and LED lens 10, LED light source 30 just to the concave spherical surface 121 on the bottom face 12 of LED lens 10, the optical axis of LED light source 20 and the dead in line of LED lens 10.LED light source 30 preferably light emitting anger is the LED light source between 110 °-130 °, and the luminescence chip of LED light source 30 flushes with the bottom face 12 of LED lens 10, and the spherical light-emitting area 31 of LED light source 30 extend in concave spherical surface 121.
The bottom face of LED lens of the present invention is provided with concave spherical surface, top end face is provided with conical concave surface, the less light of the light emitting anger of LED light source is after concave spherical surface refraction, light emitting anger is amplified for the first time, after the conical concave surface refraction of end face, light emitting anger is amplified for the second time, amplify through secondary, the comparatively high light alignment surrounding diffusion of axial ray part, the light that light emitting anger is larger is then totally reflected backward axis by revolution side and draws close, solve the problem that the light intensity of the axial ray part of LED light source is larger, more uniform floodlight luminous intensity distribution can be realized.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (9)
1. LED lens, for the luminous intensity distribution of LED light source, it is characterized in that, described LED lens (10) are revolving body, described LED lens (10) have a top end face (11) and a bottom face (12), and connect the revolution side (13) of described top end face (11) and bottom face (12);
Described bottom face (12) is provided with hemispheric concave spherical surface (121), and the centre of sphere of described hemispheric concave spherical surface (121) is positioned on the axis of described revolving body;
The middle part of described top end face (11) is provided with conical concave surface (111), the described axis of conical concave surface (111) and the dead in line of described revolving body;
If the angle of the bus of described concave surface (111) and the axis of described revolving body is θ, the summit of concave surface (111) is L to the distance of bottom face (12), the refractive index of the material of described LED lens (10) is n, top end face (11) is h to the distance of bottom face (12), then θ and L meets following relation: θ=90 °-α (η-1)/(n-1), L≤(1-tan α/tan θ) × h, wherein, α ≈ 15 °, 1.8≤η≤1.9, η > n;
Described revolution side (13) is fully reflecting surface, the bus (14) of revolution side (13) is broken line, described broken line comprises five straightways (21 be connected successively, 22, 23, 24, 25), with the center of described bottom face (12) for initial point, with the axis of revolving body for Z axis, with the symmetry axis of bottom face (12) for Y-axis, when setting up Descartes's rectangular coordinate system, the starting point coordinate of described bus (14) is (0, d/2, 0), wherein d is greater than the diameter of described LED light source, every bar straightway of described bus (14) and the angle of Z axis are 3 ~ 45 °, every bar straightway of described bus (14) and the angle of Z axis are successively decreased by the sequence of positions of origin-to-destination at bus (14) successively according to this straightway, every starting point of bar straightway of described bus (14) and the angle of the terminal of the line of initial point and this straightway and the line of initial point are 5 ~ 15 °.
2. LED lens according to claim 1, it is characterized in that, every bar straightway of described bus (14) and the angle of Z axis are followed successively by 43.5 °, 33.5 °, 23.5 °, 13.5 °, 3.5 ° at described bus (14) by the sequence of positions of origin-to-destination according to this straightway.
3. LED lens according to claim 1, is characterized in that, every starting point of bar straightway of described bus (14) and the angle of the terminal of the line of initial point and this straightway and the line of initial point are 10 °.
4. LED lens according to claim 1, is characterized in that, described d 3 ~ 5mm larger than the diameter of LED light source.
5. LED lens according to claim 1, is characterized in that, described revolution side (13) is provided with and increases anti-film.
6. LED lens according to claim 1, is characterized in that, described LED lens (10) are made up of optical glass or optical plastic.
7. LED lens according to claim 6, is characterized in that, the refractive index of described optical glass or optical plastic is greater than 1.45.
8. LED lens according to claim 6, is characterized in that, described optical plastic is Merlon or polymethyl methacrylate.
9. a LED lamp, it is characterized in that, at least comprise LED light source, and the LED lens as described in any one of claim 1 to 8, described LED light source just to the concave spherical surface (121) on described LED lens bottom face (12), the optical axis of described LED light source and the dead in line of described LED lens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110213728.9A CN102901041B (en) | 2011-07-28 | 2011-07-28 | LED (Light-Emitting Diode) lens and LED lamp provided with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110213728.9A CN102901041B (en) | 2011-07-28 | 2011-07-28 | LED (Light-Emitting Diode) lens and LED lamp provided with same |
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| Publication Number | Publication Date |
|---|---|
| CN102901041A CN102901041A (en) | 2013-01-30 |
| CN102901041B true CN102901041B (en) | 2015-01-14 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487570A (en) * | 2005-03-07 | 2009-07-22 | 三洋电机株式会社 | Lighting device |
| CN101900294A (en) * | 2010-07-30 | 2010-12-01 | 海洋王照明科技股份有限公司 | Condensing lens and lamp using same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4492193B2 (en) * | 2004-04-13 | 2010-06-30 | 岡谷電機産業株式会社 | Indicator lamp |
| TWI266079B (en) * | 2005-01-10 | 2006-11-11 | Shiu-Hua Huang | Steering lens and light emitting system using the same |
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- 2011-07-28 CN CN201110213728.9A patent/CN102901041B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487570A (en) * | 2005-03-07 | 2009-07-22 | 三洋电机株式会社 | Lighting device |
| CN101900294A (en) * | 2010-07-30 | 2010-12-01 | 海洋王照明科技股份有限公司 | Condensing lens and lamp using same |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2005-303046A 2005.10.27 * |
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| CN102901041A (en) | 2013-01-30 |
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