CN208703589U - A kind of free form surface Fresnel lighting system of novel high degree of focus - Google Patents
A kind of free form surface Fresnel lighting system of novel high degree of focus Download PDFInfo
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- CN208703589U CN208703589U CN201721832131.1U CN201721832131U CN208703589U CN 208703589 U CN208703589 U CN 208703589U CN 201721832131 U CN201721832131 U CN 201721832131U CN 208703589 U CN208703589 U CN 208703589U
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Abstract
The utility model provides a kind of free form surface Fresnel lighting system of novel high degree of focus, it is related to optical devices technologies field, a point light source is disposed with by the light direction of propagation, one includes the Fresnel Lenses and a receiving plane of free form surface, the Fresnel Lenses is arranged in parallel with the receiving plane, the point light source is arranged on the perpendicular bisector of the Fresnel Lenses and the receiving plane, the Fresnel Lenses include into optical plane and with it is described enter the multistage compound curved surface that is oppositely arranged of optical plane, dry free form surface sawtooth of N is provided on the multistage compound curved surface, the point light source be arranged in it is described enter optical plane side, the side of the multistage compound curved surface is arranged in the receiving plane；The point light source has shooting angleThe shooting angleN parts are divided into correspond with the free form surface sawtooth.The usefulness of the utility model is that the uniformity is high, structure is simple and optical energy loss is few, to adapt to actual illumination needs.
Description
Technical field
The utility model relates to optical devices technologies field, especially a kind of free form surface phenanthrene alunite of novel high degree of focus
That lighting system.
Background technique
Fresnel Lenses has many advantages, such as that price is low, area is big, light-weight and light, is a kind of widely used optics member
Part designs and manufactures and is related to multiple fields.Fresnel Lenses main application has: first is that focus illumination acts on, this lens quilt
It is widely used in the fields such as solar energy, projector illumination, slr camera, naked eye 3D display；Second is that the infrared spy of passive type will be combined
It surveys device (Passive Infrared Detection, referred to as: PIR detector) and releases infrared signal to detect heat.
Fresnel Lenses is usually to be made of many small sawtooth, by controlling the working surface angle of these sawtooth, thus
Have the function that realize reflection or refraction to the luminous energy of specified spectral region.The sawtooth working face of conventional Fresnel Lenses is logical
It is often plane, or is radially in a straight line (circular ring shape Fresnel Lenses), this lens-like focusing efficiency depends on sawtooth
Density, sawtooth density is bigger, and the focusing efficiency of Fresnel Lenses is better, and vice versa.In practice, the facewidth of sawtooth or tooth depth are got over
Small, corresponding mold requirement on machining accuracy is higher, higher so as to cause cost.In addition, each sawtooth is saturating for the Fresnel of plane
Mirror can not preferably correct the parameters such as spherical aberration, influence the uniformity of light source illumination.
Utility model content
The shortcomings that the utility model is overcome in the prior art provides a kind of free form surface phenanthrene alunite of novel high degree of focus
That lighting system, the uniformity is high, structure is simple and optical energy loss is few, to adapt to actual illumination needs.
In order to solve the above-mentioned technical problem, the utility model is achieved through the following technical solutions:
A kind of free form surface Fresnel lighting system of novel high degree of focus, is disposed with one by the light direction of propagation
Point light source, a Fresnel Lenses and a receiving plane comprising free form surface, the Fresnel Lenses are parallel with the receiving plane
Setting, the point light source are arranged on the perpendicular bisector of the Fresnel Lenses and the receiving plane, and the Fresnel Lenses includes
Enter optical plane and with it is described enter the multistage compound curved surface that is oppositely arranged of optical plane, it is dry to be provided with N on the multistage compound curved surface
A free form surface sawtooth, the point light source be arranged in it is described enter optical plane side, receiving plane setting is mixed in the multistage
Close the side of curved surface；The point light source has shooting angleThe shooting angleIt is divided into N parts and the free form surface
Sawtooth corresponds, and the light that the irradiation area is issued connects after its corresponding described free form surface sawtooth described
Receipts form line spot on face.
Further, the radius of the Fresnel Lenses is 30mm.
Further, the point light source is 50mm with a distance from optical plane from entering for the Fresnel Lenses, the receiving plane
It is 500mm with a distance from multistage compound curved surface from the Fresnel.
Further, the point light source is LED point light source.
Compared with prior art, the utility model has the beneficial effects that
The invention proposes cyclic annular Fresnel free form surface mixing broached-tooth design and many-to-one mapping modes, by right
LED point light source difference light emitting angle region is divided, and each free form surface sawtooth one of each light emitting region and Fresnel is made
One is corresponding, and the light of different range angle is enabled to be individually formed the line spot of seamless connection by corresponding saw tooth region,
Not only it had been able to achieve Uniform Illumination on the receiving surface, but also has been able to achieve the luminous energy for allowing all points on receiving plane to receive respective ray of light,
To improve illumination uniformity.In addition, free form surface Fresnel Lenses provided by the invention can also make corresponding variant, answer
For solar focusing, the focusing efficiency of luminous energy is improved.
Detailed description of the invention
Attached drawing is used to provide a further understanding of the present invention, and is used to explain together with the embodiments of the present invention
The utility model does not constitute limitations of the present invention, in the accompanying drawings:
Fig. 1 is the working principle diagram of the utility model；
Fig. 2 is the face type datagram using the resulting free form surface sawtooth of surface fitting；
Fig. 3 is using the resulting lens body figure containing free form surface of surface fitting；
Fig. 4 is the simulation effect picture of simulation softward tracePro；
Fig. 5 is the corresponding lines figure of simulation effect image of Fig. 4；
Fig. 6 is the simulation drawing that lens are not added and keep identical optical component parameter；
Fig. 7 is the corresponding lines figure of simulation effect image of Fig. 6.
In figure: 100- point light source, 110- enter optical plane, 120- multistage compound curved surface, 121,122,123,124,125,
126- free form surface sawtooth, 130- receiving plane.
Specific embodiment
It is illustrated below in conjunction with preferred embodiment of the attached drawing to the utility model, it should be understood that described herein excellent
It selects embodiment to be only used for describing and explaining the present invention, is not used to limit the utility model.
As shown in Figure 1, a kind of free form surface Fresnel lighting system of novel high degree of focus, by the light direction of propagation according to
It is secondary be provided with a point light source 100, one include free form surface Fresnel Lenses and a receiving plane 130, Fresnel Lenses with connect
Receipts face 130 is arranged in parallel, and point light source 100 is arranged on the perpendicular bisector of Fresnel Lenses and receiving plane 130, Fresnel Lenses packet
Include into optical plane 110 and with the multistage compound curved surface 120 that enters optical plane 100 and be oppositely arranged, be arranged on multistage compound curved surface 120
There is dry free form surface sawtooth of N, in the present embodiment, as shown in Figure 1, N is 6, multistage compound curved surface 120 is divided into 121,
122, the side into optical plane 110, receiving plane is arranged in 123,124,125,126 this 6 free form surface sawtooth, point light source 100
130 are arranged in the side of multistage compound curved surface 120；Point light source 100 has shooting angleShooting angleIt is divided into N parts
It is corresponded with free form surface sawtooth 121,122,123,124,125,126, N 6, the light that irradiation area is issued passes through it
After corresponding free form surface sawtooth 121,122,123,124,125,126, line spot is formed on receiving plane 130；Preferably,
Point light source 100 is LED point light source, has the characteristics that energy conservation, brightness are big；Preferably, the radius of Fresnel Lenses is 30mm, puts light
Source 100 is 50mm, multistage compound curved surface 120 of the receiving plane 130 from Fresnel with a distance from optical plane 110 from entering for Fresnel Lenses
Distance be 500mm.
As shown in Figure 1, point light source 100 is arranged at y-z coordinate origin (0,0), the luminous energy issued is propagated along light
Direction successively passes through Fresnel Lenses and enters optical plane 110, and multistage compound curved surface 120 eventually arrives at receiving plane 130, point light source 100
For a LED point light source, set its maximum light emitting angle asThe sawtooth number of Fresnel Lenses is set as 2N, point light source 100
Light emitting angle be divided into 2N parts according to sawtooth number, every portion luminous energy, which is transferred to by corresponding sawtooth by refraction action, to be connect
Corresponding area illumination is responsible in receipts face 130.The half-breadth of receiving plane 130 is ym, according to the Fresnel Lenses sawtooth number quilt
N parts, every portion line style section is ym/N.To realize the Uniform Illumination on receiving plane 130, each illumination setting for dividing region
For E.The largest light intensity of point light source 100 is Io, the expression formula that is angularly distributed are as follows:
P is a bit on free form surface sawtooth 123, and vector P may be expressed as:
For a bit, then the unit vector of emergent light is on receiving plane 130
Wherein,For on curved surfacePoint in target faceThe distance between point.
If the unit normal vector on P point is N, through deriving, method swears the expression formula of N are as follows:
WhereinRepresentative functionTo angleSeek partial derivative.
Light passes through the formula of Fresnel Lenses are as follows:
Wherein nIThe refractive index of medium where incident light, no are the refractive index of medium where emergent light.
It can be in the hope of the position equation of p point on free form surface by formula (1)-(5) are as follows:
Above formula is One first-order ordinary differential equation, can use Numerical Methods Solve.
According to law of conservation of energy, have:
In conjunction with formula (6) and (7), function can be found out using quasi-Newton methodNumerical solution, pass through matlab
Programming, can calculate each point coordinate data of the free form surface sawtooth flour mixed with adulterants.
According to the face type data, and using non-uniform rational B-spline (Non uniform rational B-spline,
NURBS) Lai Jinhang surface fitting, to obtain multistage compound curved surface 120 as shown in Figure 2.Use is based in the present embodiment
The Rhinoceros modeling software of the principle of NURBS carries out surface fitting, contains the saturating of the multistage compound curved surface 120 to obtain
Mirror entity.
The embodiment of the present invention further provides for a kind of free form surface Fresnel Lenses photograph obtained based on above-mentioned design method
Bright system, including a LED point light source 100, one enter optical plane 110, a multistage compound curved surface 120 and a receiving plane 130.It does not lose
Generality presets the round hot spot that illumination region is 20mm, LED point light source 100 is from phenanthrene if the radius of Fresnel Lenses is 30mm
The distance for entering optical plane 110 of Nie Er lens is 50mm, and receiving plane 130 is with a distance from the multistage compound curved surface 120 from Fresnel
500mm, for convenience of the features of the present invention is expressed, the sawtooth number of Fresnel Lenses is 10.Lens thickness is 4mm, and material uses
PMMA, refractive index 1.49.According to the parameter, the face type data of the multistage compound curved surface 120 calculated as shown in Fig. 2,
From calculated result as can be seen that as sawtooth number increases, to realize Uniform Illumination, the arrangement of sawtooth can be got over to staying, this with it is normal
The sawtooth arrangement of the Fresnel Lenses of rule is big different.
According to the face type data, and using non-uniform rational B-spline (Non uniform rational B-spline,
NURBS) Lai Jinhang surface fitting uses the principle based on NURBS to obtain multistage compound curved surface 120 in the present embodiment
Rhinoceros modeling software carries out surface fitting, to obtain the lens body containing the multistage compound curved surface 120, such as Fig. 3
It is shown.
After establishing entity according to face type, model is imported in simulation softward tracePro and is simulated, the effect of simulation is such as
Shown in Fig. 4 and Fig. 5, as can be seen from Figure 4 and Figure 5, free form surface Fresnel Lenses combination LED provided in an embodiment of the present invention
Illumination uniformity can be achieved up to 80% or more in point light source 100 on receiving plane 130.As a comparison, when lens are not added, phase is kept
Same optical component parameter is simulated, and obtained effect picture is as shown in Figure 6 and Figure 7.Comparison diagram 4, Fig. 5 and Fig. 6, Fig. 7, can be with
It was found that free-form surface lens can more effectively realize the focus illumination of LED point light source 100, so that luminous energy is more concentrated, utilization efficiency
It is higher.
Finally, it should be noted that the above is only the preferred embodiment of the utility model, it is not limited to practical
It is novel, although the utility model is described in detail referring to embodiment, for those skilled in the art, according to
It is so possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes, but within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all include
It is within the protection scope of the utility model.
Claims (4)
1. a kind of free form surface Fresnel lighting system of novel high degree of focus, which is characterized in that by the light direction of propagation according to
It is secondary be provided with a point light source, one include free form surface Fresnel Lenses and a receiving plane, the Fresnel Lenses with it is described
Receiving plane is arranged in parallel, and the point light source is arranged on the perpendicular bisector of the Fresnel Lenses and the receiving plane, the phenanthrene alunite
Your lens include into optical plane and with it is described enter the multistage compound curved surface that is oppositely arranged of optical plane, on the multistage compound curved surface
Be provided with dry free form surface sawtooth of N, the point light source be arranged in it is described enter optical plane side, the receiving plane is arranged in institute
State the side of multistage compound curved surface；The point light source has shooting angleThe shooting angleBe divided into N parts with it is described
The one-to-one irradiation area of free form surface sawtooth, the light that the irradiation area is issued are corresponding described freely bent by its
After the sawtooth of face, line spot is formed on the receiving plane.
2. the free form surface Fresnel lighting system of the novel high degree of focus of one kind according to claim 1, feature exist
In the radius of the Fresnel Lenses is 30mm.
3. the free form surface Fresnel lighting system of the novel high degree of focus of one kind according to claim 2, feature exist
In the point light source is 50mm with a distance from optical plane from entering for the Fresnel Lenses, and the receiving plane is from the Fresnel
The distance of multistage compound curved surface is 500mm.
4. the free form surface Fresnel lighting system of the novel high degree of focus of one kind according to claim 1, feature exist
In the point light source is LED point light source.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108506743A (en) * | 2017-12-25 | 2018-09-07 | 佛山科学技术学院 | A kind of free form surface Fresnel lighting system of high degree of focus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108506743A (en) * | 2017-12-25 | 2018-09-07 | 佛山科学技术学院 | A kind of free form surface Fresnel lighting system of high degree of focus |
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