CN104534406B - A kind of LED secondary optical lens and its manufacturing method - Google Patents
A kind of LED secondary optical lens and its manufacturing method Download PDFInfo
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- CN104534406B CN104534406B CN201510003903.XA CN201510003903A CN104534406B CN 104534406 B CN104534406 B CN 104534406B CN 201510003903 A CN201510003903 A CN 201510003903A CN 104534406 B CN104534406 B CN 104534406B
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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
- F21V5/046—Refractors for light sources of lens shape the lens having a rotationally symmetrical shape about an axis for transmitting light in a direction mainly perpendicular to this axis, e.g. ring or annular lens with light source disposed inside the ring
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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
- F21Y2101/00—Point-like light sources
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- General Engineering & Computer Science (AREA)
- Lenses (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
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Abstract
The present invention relates to optical lens technical fields, a kind of LED secondary optical lens of the present invention, including lens body, the lens body is provided with the lens positive camber of protrusion, lens negative camber in recessed lens, the raised initiating terminal of the lens positive camber is connected with the lens mounting ring of patty, the face that the lens mounting ring intersects with lens positive camber is mounting surface, the face opposite with mounting surface is basal plane, the lens positive camber of the protrusion is rotated by outcurve surface curve and the positive camber straight line being connect with outcurve surface curve around lens centre axis, the positive camber straight line intersects with mounting surface, the outcurve surface curve intersects with lens centre axis.Be not in indent on the lens positive camber, be convenient for lens modulus in injection moulding process；Script is made full use of in the light between reference plane and mounting surface, efficiently uses the light near 90 ° of emergent rays of light source, the light hot spot of transmitting is uniform by the position that positive camber straight line and mounting surface crosspoint are designed by calculating.
Description
Technical field
The present invention relates to a kind of optical lens technology, more particularly to a kind of LED secondary optical lens and its manufacturing method.
Background technology
As energy-saving and environment-friendly theory is rooted in the hearts of the people, LED（Light Emitting Diode, light emitting diode）It is saved with it
Energy, environmental protection, long lifespan three advantages, are more and more widely used.LED is white as can be achieved only to consume on theory of light sources
The energy consumption of vehement lamp 10%, than fluorescent lamp energy saving 50%.
Since the light distribution of LED light source meets class lambert body and directionality is extremely strong, need in actual use for
It designs a secondary optical lens to meet in a manner of Uniform Illumination or other illumination profiles.Meanwhile industrially in order to save into
Originally and safe to use, secondary optical lens production mostly uses injection molding and generates, and consideration injection molding is also required in die design process
The feasibility of draft.Traditional optical lens design mode mostly uses negative camber for hemisphere face, and the positive camber being calculated
There is indent near 90 ° of light, needs just to be convenient for injection molding draft, but symmetrical expression using symmetrical design in mold design
Design the physical form that can influence injecting products in mold splicing seams.Meanwhile being installed for the ease of lens, it is also necessary to which design is certain
The installation side of height, such design cause the light near 90 ° of light source that cannot be used effectively, influence it is actual go out light efficiency
Rate generates energy waste.
Therefore, it is necessary to design a kind of high and conducive to mold design the improvement LED secondary optical lens of light source utilization rate.
Invention content
It is an object of the invention to overcome the above-mentioned deficiency in the presence of the prior art, a kind of light source utilization rate height is provided simultaneously
And convenient for the LED secondary optical lens and its manufacturing method of mold design.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes：
A kind of LED secondary optical lens, including lens body, the lens body middle part are provided with the lens outcurve of protrusion
The raised initiating terminal of lens negative camber in face, recessed lens, the lens positive camber is connected with the lens mounting ring of patty,
The face that the lens mounting ring intersects with lens positive camber is mounting surface, and the face opposite with mounting surface is basal plane, the protrusion
Lens positive camber is rotated by outcurve surface curve and the positive camber straight line being connect with positive camber curve smoothing around lens centre axis,
The positive camber straight line intersects with mounting surface, and the outcurve surface curve intersects with lens centre axis.
It, should since the part intersected with mounting surface on the positive camber of this lens is that positive camber straight line is formed around center axis rotation
With 90 ° of emergent ray corresponding parts of light source be not in indent on lens positive camber, be convenient for lens modulus in injection moulding process, no
Can influence injecting products mold splicing seams physical form；The positive camber straight line intersected with mounting surface on lens positive camber leads to
The position for calculating design positive camber straight line and mounting surface crosspoint is crossed, it can be by script in the light between reference plane and mounting surface
Make full use of, efficiently use the light near 90 ° of emergent rays of light source, the light hot spot of transmitting uniformly, shadow-free, without stain,
Without astigmatism, will not occur the aperture of yellow around hot spot.
Preferably, the lens negative camber is by negative camber circular arc and the introversion surface curve being smoothly connected with negative camber circular arc
Around lens centre, axis rotates, and the negative camber circular arc intersects with lens centre axis, the introversion surface curve and the basal plane
Intersection, the introversion surface curve design corresponding with positive camber straight line.With the introversion surface curve of positive camber line correspondences design, make
It obtains 90 ° of emergent rays of light source to project from positive camber straight line portion after lens, and then makes all light source emergent rays by saturating
It is all projected from lens positive camber after mirror, avoids the light caused by light is mapped in mounting ring not utilized, improve light extraction efficiency.
Preferably, the positive camber straight line and positive camber contact of a curve, position of the positive camber straight line on mounting surface by
Mounting surface is determined relative to the height of basal plane.Positive camber straight line and the transition of positive camber curve smoothing, tangent connection, make light pass through
Light is evenly distributed after the outgoing of this lens, the light hot spot of transmitting uniformly, shadow-free, without stain, without astigmatism.
Preferably, the positive camber straight line meets condition：If lens negative camber is hemispherical, light source is in the centre of sphere, with
Lens vertical centerline is 0 ° of vertical pivot, and the basal plane line perpendicular with center line is 90 ° of horizontal axis；According to the height of mounting surface, find
The intersection point of mounting surface and 90 ° of emergent rays of light source, if the horizontal axis value of mounting surface and the intersection point of 90 ° of emergent rays of light source is less than lens
Positive camber maximum horizontal axis value, then the positive camber straight line portion of lens take the tangent line of its horizontal axis value maximum point and the horizontal axis value maximum point
With the intersection point line of mounting surface；If it is maximum that the horizontal axis value of mounting surface and the intersection point of 90 ° of emergent rays of light source is more than lens positive camber
Horizontal axis value, finding the certain point on lens positive camber makes 90 ° of emergent rays of intersection point and light source and peace of the tangent line and mounting surface
The intersection point in dress face is identical, and positive camber straight line portion takes the tangent line of the certain point on the positive camber and the intersection point line of mounting surface；Note
Positive camber straight line is θ 2 with the beam projecting angle corresponding to positive camber intersections of complex curve；
The outcurve surface curve meets condition：The lens positive camber being calculated according to Illumination Distribution and law of conservation of energy
Shape, it is outcurve surface curve that it is remaining, which to remove positive camber straight line portion on lens positive camber,；
The introversion surface curve meets condition：It is straight according to round of the light in lens corresponding to positive camber straight line
Connect the lens negative camber abscissa value acquired corresponding to 90 ° of angle of emergence light of light source, further according to calculus of finite differences, angle of incident light,
The propagation path and Refractive Index of Material of light in the material, successively 2 directions 90 ° → θ acquire light in lens positive camber linearity region
Lens corresponding to line turn inward areal coordinate, obtain negative camber curve shape；
The negative camber circular arc meets condition：Within Curve On The Surface last point coordinate a length of radius of mould, with coordinate
The circular arc in one section of 0 °~θ, 2 angle is done centered on origin.
A kind of LED secondary optical lens manufacturing method, includes the following steps：
(1) illuminator level, illumination region and lens centre height are determined；
(2) assuming that LED light source intensity distribution is lambert's body, while being set as point light source, the lens negative camber is hemispherical,
Light source is in the centre of sphere, and the outgoing curve of lens is calculated according to Illumination Distribution and law of conservation of energy；Energy binned method is
Known technology obtains the positive camber initial curve of the lens.
(3) lens are splitted along lens vertical median plane, it is assumed that lens vertical centerline is 0 ° of vertical pivot, with center line phase
Vertical basal plane line is 90 ° of horizontal axis；According to the height of mounting surface, the intersection point of mounting surface and 90 ° of emergent rays of light source is found, if peace
Dress face and the horizontal axis value of the intersection point of 90 ° of emergent rays of light source are less than lens positive camber maximum horizontal axis value, then the positive camber of lens is straight
Line part takes the tangent line of its horizontal axis value maximum point and the horizontal axis value maximum point and the intersection point line of mounting surface；If mounting surface and light source
The horizontal axis value of the intersection point of 90 ° of emergent rays is more than lens positive camber maximum horizontal axis value, and the certain point found on lens positive camber makes
The tangent line and the intersection point of mounting surface and 90 ° of emergent rays of light source are identical as the intersection point of mounting surface, lens positive camber straight line portion
Take the tangent line of the certain point on the positive camber and the intersection point line of mounting surface；And it records and is somebody's turn to do on the lens external curve in the case of two kinds
The corresponding light angle of point is θ 2；
(4) intersection point of the line correspondences zonal ray and straight line is calculated in the straight line obtained according to (3) step, meanwhile,
According to the refractive index of optical material and Snell theorems, the propagation path of light in the material is obtained.
(5) it according to the solution of (3) step and (4) step, directly acquires in the lens corresponding to 90 ° of angle of emergence light of light source
Curved surface abscissa, according to the propagation path and Refractive Index of Material of calculus of finite differences, angle of incident light, light in the material, successively
（2 directions 90 ° → θ）The lens introversion areal coordinate corresponding to light in the linearity region of lens positive camber is acquired, negative camber is drawn
Curve shape；The a length of radius of mould of the last point coordinate of Curve On The Surface does one section of circular arc within again（In 0 °~θ, 2 angles）, i.e.,
For lens negative camber circular arc；
(6) it is limited according to basal plane, mounting surface, positive camber straight line, outcurve surface curve, introversion surface curve and negative camber circular arc
Region, pass through the available physical model under this condition of 3D modeling software.
The lens manufactured by this LED secondary optical lens manufacturing methods, first according to 90 ° of emergent rays of light source and lens
The intersection position of mounting surface determines the positive camber straight line of lens, it is ensured that emergent light of the 90 ° of emergent rays of light source after lens
Point avoids energy waste on the positive camber of lens；After the positive camber straight line that lens are determined, according to biography of the light in lens
Route is broadcast, corresponding lens introversion areal coordinate in positive camber linearity region is acquired successively, draws out the shape of introversion surface curve；Again
Within Curve On The Surface last point coordinate a length of radius of mould, the circle in one section of 0 °~θ, 2 angle is done centered on coordinate origin
Arc is to get to lens negative camber circular arc.This manufacturing method meets the refractive index and Snell theorems of optical material, and light source is made to be emitted
Light is all emitted from lens positive camber after lens, the waste of light source, utilization rate will not be caused high, light is emitted from lens
Afterwards light hot spot uniformly, without astigmatism；Since lens positive camber and mounting surface contact site are positive camber straight line portion so that this is thoroughly
Mirror outer surface is not in indent, is convenient for lens modulus in injection moulding process.
Compared with prior art, beneficial effects of the present invention：
1, since the part intersected with mounting surface on the positive camber of this lens is that positive camber straight line is formed around center axis rotation,
With 90 ° of emergent ray corresponding parts of light source be not in indent on the lens positive camber, be convenient for lens modulus in injection moulding process,
Do not interfere with injecting products mold splicing seams physical form；The positive camber straight line intersected with mounting surface on lens positive camber,
The position of positive camber straight line and mounting surface crosspoint is designed by calculating, it can be by script in the light between reference plane and mounting surface
Line makes full use of, and efficiently uses the light near 90 ° of emergent rays of light source, the light hot spot of transmitting uniformly, without astigmatism, hot spot
The aperture of yellow will not occur in surrounding；
2, this manufacturing method meets the refractive index and Snell theorems of optical material, and it is accurate to calculate, and light source emergent ray is made to pass through
It crosses after lens and is all emitted from lens positive camber, the waste of light source, utilization rate will not be caused high, light is from light after lens outgoing
Hot spot uniformly, without astigmatism；Since lens positive camber and mounting surface contact site are positive camber straight line portion so that the lens appearance
Face is not in indent, is convenient for lens modulus in injection moulding process.
Description of the drawings：
Fig. 1 is LED secondary optical lens overall structure diagram of the present invention.
The LED secondary light-distribution lens structural schematic diagrams that Fig. 2 designs for conventional method.
Fig. 3 is the LED secondary optical lens structural schematic diagrams.
Fig. 4 is the LED secondary light-distribution lens around the curve synoptic diagram that center axis rotation is lens body.
Fig. 5 is the LED secondary light-distribution lens central cross-sectional views designed by example one.
Fig. 6 is the LED secondary light-distribution lens central cross-sectional views designed by example two.
The polar coordinates light distribution curve of LED secondary light-distribution lens designed by Fig. 7 examples two.
Fig. 8 is the surfaces externally and internally design flow diagram of LED secondary optical lens of the present invention.
It is marked in figure：1- lens bodies, 2- lens positive cambers, 3- lens negative cambers, 4- basal planes, 5- mounting surfaces, 21- outcurves
Surface curve, 22- positive camber straight lines, 31- negative camber circular arcs, 32- turn inward surface curve.
Specific implementation mode
With reference to test example and specific implementation mode, the present invention is described in further detail.But this should not be understood
It is only limitted to embodiment below for the range of the above-mentioned theme of the present invention, it is all that this is belonged to based on the technology that the content of present invention is realized
The range of invention.
Embodiment 1
As shown in Fig. 1 to Fig. 5, a kind of LED secondary optical lens, including lens body 1,1 middle part of the lens body are set
It is equipped with the lens positive camber 2 of protrusion, the lens negative camber 3 in recessed lens, the raised initiating terminal connection of the lens positive camber 2
There is the lens mounting ring of patty, the face that the lens mounting ring intersects with lens positive camber is mounting surface 5, opposite with mounting surface
Face be basal plane 4, the lens positive camber 2 of the protrusion is by outcurve surface curve 21 and the positive camber being connect with positive camber curve smoothing
Straight line 22 is rotated around lens centre axis, and the positive camber straight line 22 intersects with mounting surface 5, the outcurve surface curve 21 with thoroughly
Mirror central shaft intersects.
It, should since the part intersected with mounting surface on the positive camber of this lens is that positive camber straight line is formed around center axis rotation
With 90 ° of emergent ray corresponding parts of light source be not in indent on lens positive camber, be convenient for lens modulus in injection moulding process, no
Can influence injecting products mold splicing seams physical form；The positive camber straight line intersected with mounting surface on lens positive camber leads to
The position for calculating design positive camber straight line and mounting surface crosspoint is crossed, it can be by script in the light between reference plane and mounting surface
Make full use of, efficiently use the light near 90 ° of emergent rays of light source, the light hot spot of transmitting uniformly, shadow-free, without stain,
Without astigmatism, will not occur the aperture of yellow around hot spot.
In the present embodiment, the lens negative camber 3 is by negative camber circular arc 31 and the introversion being smoothly connected with negative camber circular arc
Surface curve 32 is rotated around lens centre axis, and the negative camber circular arc 31 intersects with lens centre axis, the introversion surface curve
32 intersect with the basal plane 4,32 design corresponding with positive camber straight line 22 of the introversion surface curve.It is set with positive camber line correspondences
The introversion surface curve of meter so that 90 ° of emergent rays of light source project after lens from positive camber straight line portion, and then make all light
Source emergent ray is all projected from lens positive camber after lens, avoids the light caused by light is mapped in mounting ring not sharp
With raising light extraction efficiency.
In the present embodiment, the positive camber straight line 22 is tangent with outcurve surface curve 21, and positive camber straight line 22 is on mounting surface 5
Height of the position by mounting surface 5 relative to basal plane 4 determine.Positive camber straight line and the transition of positive camber curve smoothing, tangent connection,
So that light light after the outgoing of this lens is evenly distributed, the light hot spot of transmitting uniformly, shadow-free, without stain, without astigmatism；Root
The intersection location of positive camber straight line and mounting surface is determined according to the height of mounting surface, and light source emergent ray can be made whole after lens
It is projected from lens positive camber, reduction wastes caused by light source is emitted from mounting surface.
As shown in figure 8, the LED secondary optical lens manufacturing methods, include the following steps：
(1) illuminator level, illumination region and lens centre height are determined；
(2) assuming that LED light source intensity distribution is lambert's body, while being set as point light source, the lens negative camber is hemispherical,
Light source is in the centre of sphere, and the outgoing curve of lens is calculated according to Illumination Distribution and law of conservation of energy；Energy binned method is
Known technology obtains the positive camber initial curve of the lens.
(3) assume that lens vertical centerline is 0 ° of vertical pivot, the basal plane line perpendicular with center line is 90 ° of horizontal axis；According to peace
The height in dress face, finds the intersection point of mounting surface and 90 ° of emergent rays of light source, and in the present embodiment, the horizontal axis value of the intersection point is more than saturating
Mirror positive camber maximum horizontal axis value, as shown in figure 4, the certain point found on lens positive camber makes the 90 ° of outgoing of the tangent line and light source
Light is identical as the installation intersection point on side, and lens positive camber straight line portion takes the tangent line of the point and the point and the intersection point of mounting surface to connect
Line；It is θ 2 to record the light source shooting angle on lens external curve corresponding to the point；
(4) intersection point of the line correspondences zonal ray and straight line is calculated in the straight line obtained according to (3) step, meanwhile,
According to the refractive index of optical material and Snell theorems, the propagation path of light in the material is obtained.
(5) it according to the solution of (3) step and (4) step, directly acquires in the lens corresponding to 90 ° of angle of emergence light of light source
Curved surface abscissa, according to the propagation path and Refractive Index of Material of calculus of finite differences, angle of incident light, light in the material, successively
（2 directions 90 ° → θ）The lens introversion areal coordinate corresponding to light in the linearity region of lens positive camber is acquired, negative camber is drawn
Curve shape；The a length of radius of mould of the last point coordinate of Curve On The Surface does one section of circular arc within again（In 0 °~θ, 2 angles）, i.e.,
For lens negative camber circular arc；
(6) it is limited according to basal plane, mounting surface, positive camber straight line, outcurve surface curve, introversion surface curve and negative camber circular arc
Region, pass through the available physical model under this condition of 3D modeling software.
Embodiment 2
As shown in Fig. 1 to Fig. 7, a kind of LED secondary optical lens, including lens body 1,1 middle part of the lens body are set
It is equipped with the lens positive camber 2 of protrusion, the lens negative camber 3 in recessed lens, the raised initiating terminal connection of the lens positive camber 2
There is the lens mounting ring of patty, the face that the lens mounting ring intersects with lens positive camber is mounting surface 5, opposite with mounting surface
Face be basal plane 4, the lens positive camber 2 of the protrusion is by outcurve surface curve 21 and the positive camber being connect with positive camber curve smoothing
Straight line 22 is rotated around lens centre axis, and the positive camber straight line 22 intersects with mounting surface 5, the outcurve surface curve 21 with thoroughly
Mirror central shaft intersects.
It, should since the part intersected with mounting surface on the positive camber of this lens is that positive camber straight line is formed around center axis rotation
With 90 ° of emergent ray corresponding parts of light source be not in indent on lens positive camber, be convenient for lens modulus in injection moulding process, no
Can influence injecting products mold splicing seams physical form；The positive camber straight line intersected with mounting surface on lens positive camber leads to
The position for calculating design positive camber straight line and mounting surface crosspoint is crossed, it can be by script in the light between reference plane and mounting surface
Make full use of, efficiently use the light near 90 ° of emergent rays of light source, the light hot spot of transmitting uniformly, shadow-free, without stain,
Without astigmatism, will not occur the aperture of yellow around hot spot.
In the present embodiment, the lens negative camber 3 is by negative camber circular arc 31 and the introversion being smoothly connected with negative camber circular arc
Surface curve 32 is rotated around lens centre axis, and the negative camber circular arc 31 intersects with lens centre axis, the introversion surface curve
32 intersect with the basal plane 4,32 design corresponding with positive camber straight line 22 of the introversion surface curve.It is set with positive camber line correspondences
The introversion surface curve of meter so that 90 ° of emergent rays of light source project after lens from positive camber straight line portion, and then make all light
Source emergent ray is all projected from lens positive camber after lens, avoids the light caused by light is mapped in mounting ring not sharp
With raising light extraction efficiency.
In the present embodiment, the positive camber straight line 22 is tangent with outcurve surface curve 21, and positive camber straight line 22 is on mounting surface 5
Height of the position by mounting surface 5 relative to basal plane 4 determine.Positive camber straight line and the transition of positive camber curve smoothing, tangent connection,
So that light light after the outgoing of this lens is evenly distributed, the light hot spot of transmitting uniformly, shadow-free, without stain, without astigmatism；Root
The intersection location of positive camber straight line and mounting surface is determined according to the height of mounting surface, and light source emergent ray can be made whole after lens
It is projected from lens positive camber, reduction wastes caused by light source is emitted from mounting surface.
As shown in figure 8, the LED secondary optical lens manufacturing methods, include the following steps：
(1) illuminator level, illumination region and lens centre height are determined；
(2) assuming that LED light source intensity distribution is lambert's body, while being set as point light source, the lens negative camber is hemispherical,
Light source is in the centre of sphere, and the outgoing curve of lens is calculated according to Illumination Distribution and law of conservation of energy；Energy binned method is
Known technology obtains the positive camber initial curve of the lens.
(3) assume that lens vertical centerline is 0 ° of vertical pivot, the basal plane line perpendicular with center line is 90 ° of horizontal axis；According to peace
The height in dress face, finds the intersection point of mounting surface and 90 ° of emergent rays of light source, and in the present embodiment, the horizontal axis value of the intersection point is less than saturating
Mirror positive camber maximum horizontal axis value, as shown in Figure 4 and Figure 6, the positive camber straight line portion of lens take its horizontal axis value maximum point and the point
Tangent line and mounting surface intersection point line；It is θ 2 to record the light source shooting angle on lens external curve corresponding to the point；
(4) intersection point of the line correspondences zonal ray and straight line is calculated in the straight line obtained according to (3) step, meanwhile,
According to the refractive index of optical material and Snell theorems, the propagation path of light in the material is obtained.
(5) it according to the solution of (3) step and (4) step, directly acquires in the lens corresponding to 90 ° of angle of emergence light of light source
Curved surface abscissa, according to the propagation path and Refractive Index of Material of calculus of finite differences, angle of incident light, light in the material, successively
（2 directions 90 ° → θ）The lens introversion areal coordinate corresponding to light in the linearity region of lens positive camber is acquired, negative camber is drawn
Curve shape；The a length of radius of mould of the last point coordinate of Curve On The Surface does one section of circular arc within again（In 0 °~θ, 2 angles）, i.e.,
For lens negative camber circular arc；
(6) it is limited according to basal plane, mounting surface, positive camber straight line, outcurve surface curve, introversion surface curve and negative camber circular arc
Region, pass through the available physical model under this condition of 3D modeling software.,
As shown in fig. 7, the polar coordinates light distribution curve of the LED secondary light-distribution lens of this method design, by that can be seen in figure
Go out, which is evenly distributed, and meets the requirements.
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
This specification（Including any accessory claim, abstract and attached drawing）Disclosed in any feature, except non-specifically chatting
It states, can be replaced by other alternative features that are equivalent or have similar purpose.That is, unless specifically stated, each feature is only
It is an example in a series of equivalent or similar characteristics.
Claims (4)
1. a kind of LED secondary optical lens, including lens body, the lens body is provided with the lens positive camber, recessed of protrusion
Enter the lens negative camber in lens, the raised initiating terminal of the lens positive camber is connected with the lens mounting ring of patty, described
The face that lens mounting ring intersects with lens positive camber is mounting surface, and the face opposite with mounting surface is basal plane, which is characterized in that described
The lens positive camber of protrusion by outcurve surface curve and positive camber straight line connect with outcurve surface curve around the rotation of lens centre axis and
At the positive camber straight line intersects with mounting surface, and the outcurve surface curve intersects with lens centre axis, and the positive camber straight line is full
Sufficient condition：If lens negative camber is hemispherical, light source is in the centre of sphere, using lens vertical centerline as 0 ° of vertical pivot, with center line phase
Vertical basal plane line is 90 ° of horizontal axis；According to the height of mounting surface, the intersection point of mounting surface and 90 ° of emergent rays of light source is found, if peace
Dress face and the horizontal axis value of the intersection point of 90 ° of emergent rays of light source are less than lens positive camber maximum horizontal axis value, then the positive camber of lens is straight
Line part takes the tangent line of its horizontal axis value maximum point and the horizontal axis value maximum point and the intersection point line of mounting surface；If mounting surface and light source
The horizontal axis value of the intersection point of 90 ° of emergent rays is more than lens positive camber maximum horizontal axis value, and the certain point found on lens positive camber makes
The tangent line and the intersection point of mounting surface and 90 ° of emergent rays of light source are identical as the intersection point of mounting surface, and positive camber straight line portion takes outer
The tangent line of certain point on curved surface and the intersection point line of mounting surface；Remember positive camber straight line and the light corresponding to positive camber intersections of complex curve
Line shooting angle is θ 2；The introversion surface curve design corresponding with positive camber straight line so that light is all after lens
Emergent ray is above positive camber straight line and mounting surface intersection, and the lens negative camber is justified by negative camber circular arc and with negative camber
The introversion surface curve that arc is smoothly connected is rotated around lens centre axis, and the introversion surface curve meets condition：Corresponding to outcurve
Face straight line directly acquires the lens negative camber corresponding to 90 ° of angle of emergence light of light source according to round of the light in lens
Abscissa value, further according to the propagation path and Refractive Index of Material of calculus of finite differences, angle of incident light, light in the material, 90 ° successively
→ θ acquires in 2 direction the lens introversion areal coordinate corresponding to light in lens positive camber linearity region, obtains negative camber curved shape
Shape, the positive camber straight line and positive camber contact of a curve, position of the positive camber straight line on mounting surface is by mounting surface relative to base
The height in face determines.
2. LED secondary optical lens according to claim 1, which is characterized in that the negative camber circular arc and lens centre
Axis intersects, and the introversion surface curve intersects with the basal plane.
3. LED secondary optical lens according to claim 1 or 2, which is characterized in that the outcurve surface curve meets item
Part：The lens positive camber shape being calculated according to Illumination Distribution and law of conservation of energy removes positive camber on lens positive camber
Remaining straight line portion is outcurve surface curve；
The negative camber circular arc meets condition：Within Curve On The Surface last point coordinate a length of radius of mould, with coordinate origin
Centered on do circular arc in one section of 0 °~θ, 2 angle.
4. the manufacturing method of LED secondary optical lens according to claim 1, which is characterized in that include the following steps：
(1) illuminator level, illumination region and lens centre height are determined；
(2) assume that LED light source intensity distribution is lambert's body, while being set as point light source, the lens negative camber is hemispherical, light source
In the centre of sphere, lens positive camber is calculated according to Illumination Distribution and law of conservation of energy；
(3) lens are splitted along lens vertical median plane, it is assumed that lens vertical centerline is 0 ° of vertical pivot, perpendicular with center line
Basal plane line is 90 ° of horizontal axis；According to the height of mounting surface, find the intersection point of mounting surface and 90 ° of emergent rays of light source, if mounting surface with
The horizontal axis value of the intersection point of 90 ° of emergent rays of light source is less than lens positive camber maximum horizontal axis value, then the positive camber straight line portion of lens
Take the tangent line of its horizontal axis value maximum point and the horizontal axis value maximum point and the intersection point line of mounting surface；If mounting surface goes out for 90 ° with light source
The horizontal axis value for penetrating the intersection point of light is more than lens positive camber maximum horizontal axis value, and finding the certain point on lens positive camber makes the point cut
Line and the intersection point of mounting surface and 90 ° of emergent rays of light source are identical as the intersection point of mounting surface, and lens positive camber straight line portion takes this outer
The tangent line of certain point on curved surface and the intersection point line of mounting surface；And it is right to record point institute on the lens external curve in the case of two kinds
The light angle answered is θ 2；
(4) the positive camber line correspondences zonal ray and the positive camber straight line is calculated in the straight line obtained according to (3) step
Intersection point, meanwhile, according to the refractive index of optical material and Snell theorems, obtain the propagation path of light in the material, i.e. light
Round in lens；
(5) according to the solution of (3) step and (4) step, the lens negative camber corresponding to 90 ° of angle of emergence light of light source is directly acquired
Abscissa value, further according to the propagation path and Refractive Index of Material of calculus of finite differences, angle of incident light, light in the material, 90 ° successively
→ θ acquires in 2 direction the lens introversion areal coordinate corresponding to light in lens positive camber linearity region, draws out negative camber curved shape
Shape；The a length of radius of mould of the last point coordinate of Curve On The Surface within again, does one section of 0 °~θ, 2 angle centered on coordinate origin
Interior circular arc, as lens negative camber circular arc；
(6) according to area defined by basal plane, mounting surface, positive camber straight line, outcurve surface curve, introversion surface curve and negative camber circular arc
Domain obtains physical model by 3D modeling software.
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| CN201228918Y (en) * | 2008-07-12 | 2009-04-29 | 鹤山丽得电子实业有限公司 | Distributing lens of LED street lamp |
| CN201425257Y (en) * | 2009-05-14 | 2010-03-17 | 上海广电光电子有限公司 | Led light source device |
| CN103453439A (en) * | 2012-12-28 | 2013-12-18 | 欧普照明股份有限公司 | Optical module applied to LED superthin lamp |
| CN104006352A (en) * | 2014-05-23 | 2014-08-27 | 上海理工大学 | Method for manufacturing multi-curved surface lens light distribution device |
| CN204300978U (en) * | 2015-01-06 | 2015-04-29 | 成都恒坤光电科技有限公司 | A kind of LED secondary optical lens |
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| US8773616B2 (en) * | 2009-10-19 | 2014-07-08 | Panasonic Corporation | Illuminating lens, lighting device, surface light source, and liquid crystal display apparatus |
| US9134007B2 (en) * | 2012-11-06 | 2015-09-15 | Darwin Precisions Corporation | Light source device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201228918Y (en) * | 2008-07-12 | 2009-04-29 | 鹤山丽得电子实业有限公司 | Distributing lens of LED street lamp |
| CN201425257Y (en) * | 2009-05-14 | 2010-03-17 | 上海广电光电子有限公司 | Led light source device |
| CN103453439A (en) * | 2012-12-28 | 2013-12-18 | 欧普照明股份有限公司 | Optical module applied to LED superthin lamp |
| CN104006352A (en) * | 2014-05-23 | 2014-08-27 | 上海理工大学 | Method for manufacturing multi-curved surface lens light distribution device |
| CN204300978U (en) * | 2015-01-06 | 2015-04-29 | 成都恒坤光电科技有限公司 | A kind of LED secondary optical lens |
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