CN102901043A - Optical lens with free-form surfaces for LED dipped headlight of motorcycle - Google Patents
Optical lens with free-form surfaces for LED dipped headlight of motorcycle Download PDFInfo
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- CN102901043A CN102901043A CN2012102376195A CN201210237619A CN102901043A CN 102901043 A CN102901043 A CN 102901043A CN 2012102376195 A CN2012102376195 A CN 2012102376195A CN 201210237619 A CN201210237619 A CN 201210237619A CN 102901043 A CN102901043 A CN 102901043A
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Abstract
The invention discloses an optical lens with free-form surfaces for an LED dipped headlight of a motorcycle. A cavity is arranged on the inner side of a lens, and an LED is fed into the lens via an opening end and is mounted in the cavity during usage. The lens comprises an incident surface and an emergent surface, and the incident surface is arranged on the inner side of the lens, and comprises a free-form surface on the top of the cavity and a cylindrical surface on the wall of the cavity; the emergent surface is arranged on a top plane on the outer side of the lens, and an outer side surface of the lens is a peripheral free-form surface; the lens is divided into an upper portion and a lower portion, and the upper portion of the lens is mainly used for irradiating light, which is transmitted by an LED light source to positions above a horizontal plane, to an illuminating surface below the horizontal plane; and the lower portion of the lens is mainly used for converging light, which is diffused by the LED light source to positions below the horizontal plane, onto the illuminating surface below the horizontal plane. The optical lens is simple in structure and small in size, light distribution can be carried out without other aids, the efficiency of solar energy utilization is improved, a glaring effect is weak, and the light distribution requirement of GB5948-1998 is met.
Description
Technical field
The present invention relates to LED Motorcycle headlight lighting technical field, particularly for the optical lens with free curved surface of LED motorcycle dipped headlights.
Background technology
Light emitting diode (LED) has the plurality of advantages such as volume is little, energy consumption is low, response is fast, the life-span is long, is widely used in lighting field in recent years, and the application in automobile lighting is also more and more general.But, because the LED characteristics of luminescence is different from conventional light source, in order to satisfy photometric standards, improve systematic function, need to carry out secondary optical design for LED, thereby realize the optimization of headlamp lighting system.
For road safety, the performance of motorcycle headlamp is even more important, and in design, standard GB/T 5948-1998 stipulates the light distribution requirements of motorcycle headlamp.For dipped headlights, illuminated area generation one horizontal line that GB requirement 25m before car light is far away and horizontal line right side be 15 ° "cut-off"line upwards, and the brightness value size of zones of different has also been done corresponding regulation on the illuminated area.
Summary of the invention
The subject matter that design faces for the LED motorcycle headlamp, the invention provides the optical lens with free curved surface for LED motorcycle dipped headlights, these lens fabrication and installation are convenient, volume is little, glare effect is low, the efficiency of light energy utilization is high, and can produce the Illumination Distribution of the light distribution requirements that satisfies GB GB5948-1998.The present invention uses the method for designing of axisymmetry LED illuminator, the error that has produced when effectively having reduced the free form surface simulation modeling, and the while has also been improved optical accuracy and the operating efficiency of lens well.
The present invention adopts following technical scheme:
The optical lens with free curved surface that is used for LED motorcycle dipped headlights, the inboard of described lens are one to have cavity, with the cavity top over against be openend, LED enters and is installed in this cavity from this openend during use; Lens comprise the plane of incidence and exit facet, and the inboard of lens is the described plane of incidence, and the plane of incidence is made of the free form surface at described cavity top and the cylinder of chamber wall; And the top planes in the lens outside is described exit facet, and the side in the lens outside is peripheral free form surface; When the light of led light source core passes through lens, at the described free form surface on top, the inboard chamber of lens and the top planes exit facet in the lens outside twice refraction occuring, shines on the illuminated area again; The light of led light source periphery is during through lens, and the cylinder at the inboard chamber of lens wall reflects first, and total reflection occurs the peripheral free form surface in the lens outside again, and produces refraction in the top planes outgoing in the lens outside, shines at last on the illuminated area; Described lens are divided into upper and lower two parts, and part is mainly used in led light source directive light is above water reflected, reflects and reflects on the lens, then according on the illuminated area below the horizontal plane; Part then is mainly used in led light source is reflected, reflects and reflect to the light that spreads below the horizontal plane under the lens, then converges on the following illuminated area of horizontal plane.
Further, the shape of free-form surface lens is determined as follows:
Set up coordinate system take led light source as origin of coordinates O, plane, place, LED bottom surface is XOY plane, and crossing initial point and the axle vertical with plane X OY is Z axis, and wherein plane X OZ is horizontal plane.And the Z axis intersection point is that o(point O and the distance of point between o are 25m) and the plane that is parallel to plane X OY be illuminated area, some o is the central point of illuminated area.At first according to motorcycle headlamp dipped headlights Illumination Distribution feature (such as GB5948-1998) on illuminated area, field of illumination on the illuminated area is set as central point take illuminated area as the center of circle, sideline, center of circle left side is that horizontal line and sideline, right side, the center of circle are the part circular (namely 195 ° fan-shaped) of 15 ° of oblique lines on the horizontal alignment, then this part circular being carried out endless belt divides, then the uses energy law of conservation is divided the light source solid angle again, uses at last the catadioptric law namely to obtain the free form surface of lens by numerical computations.
According to GB GB5948-1998, the irradiation of the motorcycle headlamp dipped headlights overwhelming majority is on the illuminated area below the horizontal plane, and only existence becomes 15 ° field of illumination with horizontal alignment on the right side.Therefore, described lens are divided into upper and lower two parts, and part is mainly carried out catadioptric with directive light above water on the lens, then according on the illuminated area below the horizontal plane; Part then mainly will be carried out catadioptric to the light that spreads below the horizontal plane under the lens, then converge on the following illuminated area of horizontal plane.
The shape of the upper part of lens and the lower part of lens is determined by following:
1, sets primary condition and endless belt is carried out in the target illumination zone divide.
At first the distance of target illumination identity distance LED is d=25m, and the total light flux of led light source is Q, and central light strength is I
0=Q/ π.θ is the projection of emergent ray on XOY plane and the angle of X-axis in the coordinate system,
Angle for emergent ray and Z axis positive direction.Because this optical system about the Z axis axisymmetry, therefore can be considered two-dimensional case, take plane, YOZ place as example.
For dipped headlights, setting as mentioned before its target illumination zone is part circular.
For the upper part of lens, the radius of establishing part circular on the illuminated area is r
UpCoordinate to illuminated area carries out discretization, at first radius of circle r
UpBe divided into n part, r
iRadius r behind the expression five equilibrium
UpI part, 0＜i≤n wherein; Then equally take the illuminated area central point as the center of circle, respectively with r
iDraw circle for radius, the field of illumination is divided into the part circular ring belt area.On the target illumination zone, the energy of every a part circular ring belt area is:
In the formula, E
uK
iThe expression brightness value is according to the GB requirement, so constant E is set
uFor default brightness value, in conjunction with variable k
iBe used for controlling the brightness value size of appointed area on the illuminated area, in order to form predetermined Illumination Distribution, wherein, 0≤k
i≤ 1.k
iValue size need to set according to illumination requirement on the illuminated area, as for brightest area k
iSpan be 0.9-1, for fringe region k
iSpan be 0-0.1.
In addition, because LED and nonideal spot light, but LED can be considered as approximate spot light, therefore for the free form surface of part on the lens, the span of θ differs and is decided to be 0 °-195 °, through repeatedly analogue simulation adjustment in calculating, the span of θ can be got-4 °-202 °, and just can produce the Y-axis left side at illuminated area be that horizontal line and Y-axis right side are 15 ° "cut-off"line on the horizontal alignment.
So, for the lower part of lens, the span of θ just is 202 °-356 °.
In like manner, for the lower part of lens, the radius of establishing the part circular on the illuminated area is r
DownCoordinate to illuminated area carries out discretization, namely radius of circle r
DownBe divided into m part, r
jRadius r behind the expression five equilibrium
DownJ part, wherein, 0＜j≤m is divided into the field of illumination part circular ring belt area at last.On the target illumination zone, the energy of every a part circular ring belt area is:
In the formula, constant E
dBe default brightness value, variable k
jBe illumination control parameter.E
dAnd k
jValue and E mentioned above
uAnd k
iIn like manner.
The bore that it should be noted that the radius of position, field of illumination of the size of lens and illuminated area and lens inner chambers is relevant., in order to make the coordination attractive in appearance of the upper and lower two parts of lens, have globality herein, can take the field of illumination radius of part on the lens greater than the field of illumination radius of part under the lens, perhaps increase the cavity bore of part on the lens.
2, utilize law of conservation of energy that the light source solid angle is divided.
Endless belt corresponding to the target illumination zone is divided, and the solid angle of light source is carried out discretization.
For the upper part of lens, the solid angle of light source center part is carried out discretization (in this example
Be set to
), namely
Be divided into n part,
Expression
I part,
With r
iCorresponding one by one.Equally, the solid angle of light source periphery is carried out discretization (in this example
Be set to
),
Be divided into n part,
Expression
I part,
With r
iCorresponding one by one.
For the upper part of lens, before light is injected lens, the luminous flux E of the every a angle inner light source of light source center part
UcLuminous flux E with the every a angle inner light source of light source periphery
UlTotal light flux be:
As mentioned before, the span of following formula θ all is-4 °-202 °.So, do not consider the energy loss of light in scioptics and communication process, have according to the conservation of energy:
E
up=E
uc+E
ul
Unite above-mentioned various, thereby can find the solution obtain corresponding
With
In like manner, for the lower part of lens, the solid angle of light source center part is carried out discretization (in this example
Be set to
), namely
Be divided into m part,
Expression
J part,
With r
jCorresponding one by one.Equally, the solid angle of light source periphery is carried out discretization (in this example
Be set to
),
Be divided into m part,
Expression
I part,
With r
jCorresponding one by one.Before light is injected lens, the luminous flux E of the every a angle inner light source of light source center part
DcLuminous flux E with the every a angle inner light source of light source periphery
DlTotal light flux be:
Wherein, the span of θ is 202 °-356 °.Do not consider the energy loss of light in scioptics and communication process, have according to the conservation of energy:
E
down=E
dc+E
dl
Unite above-mentioned various, also can find the solution obtain corresponding
With
3, obtain point coordinates on the free form surface by the catadioptric law
Obtain the normal vector of putting on the described curved surface by the catadioptric law, utilize this normal vector to try to achieve tangent line, obtain the coordinate put on the curve by the intersection point of asking tangent line and incident ray, the vector form of catadioptric law can be expressed as:
Wherein,
Be the incident ray unit vector,
Be the emergent ray unit vector,
Be unit normal vector, n is the index of refraction in lens.
For the upper part of lens, we calculate first the core of lens, and what at first need to determine is the calculating initial point of lens, initial point definite as follows: establish first initial point
Value is 0 °, then chooses the cavity top free form surface height (distance of this point and bottom surface) of lens inboard, and this has highly determined the size of whole lens, then chooses suitable lens thickness according to the height of this free form surface again.Can be calculated the first free curve and the first straight line by these two initial values, because take plane, YOZ place as example, so these two line segments are on the YOZ plane.What the first free curve represented is the free form surface at part inner chambers top on the lens, and what the first straight line represented is the plane of lens top minute outside top, and last some correspondence of this first free curve and the first straight line
Value all is 60 °.
Then calculate the periphery of lens, on the XOZ plane, cross last point of the first free curve and make second straight line vertical with Y-axis, the caliber size of the second straight line and inner chambers, this some correspondence equally
Value is 90 °, and what this second straight line represented is the cylinder of the inboard chamber of part wall on the lens.Lens periphery part free form surface initial point
Value is made as 90 °, and the size of numerical value slightly gets final product slightly greatly than the bore of lens inner chambers, and then by can be calculated second free curve that is positioned on the YOZ plane, what this second free curve represented is that lens top divides the outside peripheral free form surface.
In like manner, lower part for lens, according to top selected lens cavity top free form surface height and lens thickness, can calculate the 3rd free curve and the 3rd straight line of lens centre part, what the 3rd free curve represented is the free form surface at part inner chambers top under the lens, what the 3rd straight line represented is the plane (the 3rd straight line is equivalent to the first straight line 1 in fact, and namely the upper and lower two-part exit facet of our lens is set to same plane) of lens bottom minute outside top.Then try to achieve the of lens periphery part again and make straight line and four selfs by curve, the what make that straight line represents is the cylinder of the inboard chamber of part wall under the lens, and what four selfs were represented by curve is that the lens bottom divides the outside peripheral free form surface.
Just as mentioned before, in order to make the coordination attractive in appearance of the upper and lower two parts of lens, have globality, can take the cavity bore of part on the lens greater than the cavity bore of part under the lens.
4, the point that utilizes machine emulated software to obtain fits to curved surface
The upper and lower two-part discrete point coordinate of the lens that obtain is imported to respectively mechanical modeling software, fit to eight line segments that are positioned on the YOZ plane, wherein four is straight line, and four is free curve.Doing suitable processing with the junction of line online is connected with being connected, make four line segments of part on the lens be combined into a continuous sectional curve, then make this curve around 94 ° of Z axis positive direction rotations, around 112 ° (being that θ gets-4 °-202 °) of Z axis negative direction rotation, can be processed into the physical model of part on the lens again.In like manner, make four line segments of part under the lens be combined into a continuous sectional curve, then make this curve around 68 ° of Z axis positive direction rotations, again around 86 ° (being that θ gets 202 °-356 °) of Z axis negative direction rotation, can be processed into the physical model of part under the lens.By the upper and lower two parts of lens are processed match, finally obtain the optical lens with free curved surface model of LED motorcycle dipped headlights.
Compared with prior art, advantage of the present invention has: the light energy that led light source sends is outgoing after the free-form surface lens catadioptric only, does not need other servicing unit to carry out luminous intensity distribution, has reduced the loss of light distributing system to luminous energy, has improved the efficiency of light energy utilization.The volume of lens is little, and glare effect is low, reaches the light distribution requirements of GB5948-1998, and the configuration design of lens is convenient to the installation of heat abstractor and led light source, is conducive to improve the radiating efficiency of whole light fixture.The present invention utilizes axisymmetry LED illumination system layout method, not only is convenient to simulation modeling, and the optical accuracy of institute's established model is high.
Description of drawings
Fig. 1 be in the embodiment on the illuminated area target area endless belt divide schematic diagram.
Fig. 2 is illuminator coordinate system schematic diagram in the embodiment.
Fig. 3 is the schematic diagram of light process lens luminous intensity distribution in the embodiment.
Fig. 4 be in the embodiment on the dipped headlight lens part the 3 D stereo front elevational schematic.
Fig. 5 be in the embodiment on the dipped headlight lens part two-dimentional front elevational schematic.
Fig. 6 be in the embodiment on the dipped headlight lens part the 3 D stereo schematic side view.
Fig. 7 be in the embodiment under the dipped headlight lens part the 3 D stereo front elevational schematic.
Fig. 8 be in the embodiment under the dipped headlight lens part two-dimentional front elevational schematic.
Fig. 9 be in the embodiment under the dipped headlight lens part the 3 D stereo schematic side view.
Figure 10 is the 3 D stereo schematic side view of dipped headlight lens in the embodiment.
Figure 11 is the 3 D stereo elevational schematic view of dipped headlight lens in the embodiment.
Figure 12 is the 3 D stereo schematic rear view of dipped headlight lens in the embodiment.
The specific embodiment
Above content has been done sufficient explanation to the present invention, and the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The open LED Motorcycle headlight dipped headlights optics lens of the present invention, this lens volume is little, and glare effect is low, and the efficiency of light energy utilization is high, and is easy for installation, can produce light type and the Illumination Distribution of the light distribution requirements that satisfies GB GB5948-1998.
The optical lens with free curved surface that is used for LED motorcycle dipped headlights in this example is made by transparent material, and transparent material can be PMMA or PC or optical glass.The inboard of described lens is cavitys, needs during illumination LED is installed in this cavity.Lens comprise the plane of incidence and exit facet.The inboard of lens is planes of incidence, and namely the plane of incidence is made of the free form surface at cavity top and the cylinder of chamber wall; And the top planes in the lens outside is exit facet.When the light of led light source core passes through lens, at the free form surface plane of incidence on top, the inboard chamber of lens and the plane exit facet of lens outside top twice refraction occuring, shines on the illuminated area again; When the light of led light source periphery passes through lens, the cylinder plane of incidence at the inboard chamber of lens wall reflects first, total reflection occurs in the free form surface in the lens outer periphery again, and produces refraction at the plane of lens outside top exit facet, shines on the illuminated area at last.
For dipped headlights, it is that horizontal line and right side are 15 ° "cut-off"line on the horizontal alignment that GB requires before car light 25m illuminated area far away to produce a left side, and the brightness value size of zones of different has also been done corresponding regulation on the illuminated area.According to light type and the Illumination Distribution of the light distribution requirements of GB, the part circular endless belt is carried out in the field of illumination on the illuminated area divide, as shown in Figure 1.
Then uses energy law of conservation, the light source solid angle is divided, energy in every a solid angle corresponds to the energy of part circular endless belt on the illuminated area, be illustrated in figure 2 as illuminator coordinate system schematic diagram, set up coordinate system take led light source as origin of coordinates O, according to the spherical coordinates diagram led light source solid angle is divided.θ is the projection of emergent ray on XOY plane and the angle of X-axis in the coordinate system,
Angle for emergent ray and Z axis positive direction.
Because this optical system is about the Z axis axisymmetry, therefore can consider two-dimensional case, take plane, YOZ place as example, lens luminous intensity distribution principle schematic as shown in Figure 3, when the light of led light source core passes through lens, at the free form surface plane of incidence on top, the inboard chamber of lens and the plane exit facet of lens outside top twice refraction occuring, shines on the illuminated area again; When the light of led light source periphery passes through lens, the cylinder plane of incidence at the inboard chamber of lens wall reflects first, total reflection occurs in the free form surface in the lens outer periphery again, and produces refraction at the plane of lens outside top exit facet, shines on the illuminated area at last.The upper part of lens mainly with directive light catadioptric above water according on the illuminated area below the horizontal plane, on the lower part of lens then mainly will converge to illuminated area below the horizontal plane to the light catadioptric that spreads below the horizontal plane.In Fig. 3,1 and 5 are respectively on the lens free form surface that push up in part and the inboard chamber of lower part, 2 and 6 are respectively on the lens plane of part and bottom minute outside top, 3 and 7 are respectively on the lens cylinder of part and chamber, lower part inboard wall, 4 and 8 for dividing the outside peripheral free form surface in part and bottom on the lens, wherein, 1,2,5 and 6 consist of the core of lens, and 3,4,7 and 8 consist of the periphery of lens.
Upper part for lens, the light source solid angle that the endless belt of dividing according to the primary condition of setting, target illumination zone distributes and divides by law of conservation of energy accordingly, use the catadioptric law to obtain the normal vector that incident ray acts on the free form surface and utilize this normal vector to try to achieve tangent line, obtain the coordinate of putting on the required line segment by the intersection point of asking tangent line and incident ray.Can simulate four line segments that are positioned on the XOZ plane by these a series of points that calculate, wherein two is straight line, and two is free curve.Then doing suitable processing with the junction of line online is connected with being connected, make these four line segments be combined into a continuous sectional curve, then make this curve around 94 ° of Z axis positive direction (clockwise) rotations, around 112 ° of Z axis negative direction (counterclockwise) rotations, can be processed into the physical model of part on the lens again.As shown in Figure 4, wherein, the curve 9 that dotted line represents is the free curve of part on the YOZ plane on the lens.Fig. 5 and the 3 D stereo front elevational schematic and the 3 D stereo schematic side view that Figure 6 shows that part on the difference lens.
In like manner, lower part for lens, distribute and corresponding light source solid angle of dividing by law of conservation of energy according to the primary condition of setting, the endless belt that the target illumination zone is divided, utilization catadioptric law also can be obtained four line segments on the YOZ plane.These four line segments are combined into a continuous sectional curve, then make this curve around 68 ° of Z axis positive direction (clockwise) rotations, again around 86 ° of Z axis negative direction (counterclockwise) rotations, can be processed into the physical model of part under the lens.As shown in Figure 7, wherein, the curve 10 that dotted line represents is the free curve of part on the YOZ plane under the lens.Fig. 8 and 3 D stereo front elevational schematic and the 3 D stereo schematic side view that is respectively part under the lens shown in Figure 9.
At last, in order to make the coordination attractive in appearance of the upper and lower two parts of lens, have globality, by the upper and lower two parts of lens are processed match, finally obtain the optical lens with free curved surface model of LED motorcycle dipped headlights.Such as Fig. 8, Fig. 9 and shown in Figure 10, be respectively 3 D stereo schematic side view, elevational schematic view and the schematic rear view of dipped headlight lens.
More than the optical lens with free curved surface of LED motorcycle dipped headlights provided by the present invention is described in detail, LED should be installed in the cylindrical cavity of lens inboard when using these lens, this position is easy for installation and be beneficial to heat radiation.According to the illumination needs, lens can be little downward-sloping as the axle center take LED.Used various integral body among the present invention and with the illustraton of model that separates the specific embodiment has been set forth, the above only is the better feasible examples of implementation of the present invention.For those skilled in the art, according to thought of the present invention, all can be improved part in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.
Claims (8)
1.
The optical lens with free curved surface that is used for LED motorcycle dipped headlights, the inboard that it is characterized in that described lens are one to have cavity, with the cavity top over against be openend, LED enters and is installed in this cavity from this openend during use; Lens comprise the plane of incidence and exit facet, and the inboard of lens is the described plane of incidence, and the plane of incidence is made of the free form surface at described cavity top and the cylinder of chamber wall; And the top planes in the lens outside is described exit facet, and the side in the lens outside is peripheral free form surface; When the light of led light source core passes through lens, at the described free form surface on top, the inboard chamber of lens and the top planes exit facet in the lens outside twice refraction occuring, shines on the illuminated area again; The light of led light source periphery is during through lens, and the cylinder at the inboard chamber of lens wall reflects first, and total reflection occurs the peripheral free form surface in the lens outside again, and produces refraction in the top planes outgoing in the lens outside, shines at last on the illuminated area; Described lens are divided into upper and lower two parts, and part is mainly used in led light source directive light is above water reflected, reflects and reflects on the lens, then according on the illuminated area below the horizontal plane; Part then is mainly used in led light source is reflected, reflects and reflect to the light that spreads below the horizontal plane under the lens, then converges on the following illuminated area of horizontal plane.
2. the optical lens with free curved surface for LED motorcycle dipped headlights according to claim 1 is characterized in that, the shape of described optical lens with free curved surface is determined as follows:
Set up coordinate system take led light source as origin of coordinates O, plane, place, LED bottom surface is XOY plane, and crossing initial point and the axle vertical with plane X OY is Z axis, and wherein plane X OZ is horizontal plane; With the Z axis intersection point be o, and the plane that is parallel to plane X OY is illuminated area, some o is the central point of illuminated area; At first according to motorcycle headlamp dipped headlights Illumination Distribution feature on illuminated area, field of illumination on the illuminated area is set as i.e. 195 ° fan-shaped of part circular, fan-shaped central point take illuminated area becomes 15 ° oblique line as the sideline, right side as the center of circle, take left side, center of circle horizontal line as the sideline, left side, on right side, the center of circle and the horizontal alignment, this part circular is carried out endless belt be divided into the n equal portions, the light source solid angle is carried out the n equal portions divide, use at last the catadioptric law namely to obtain the free form surface of lens by numerical computations.
3. the optical lens with free curved surface for LED motorcycle dipped headlights according to claim 1 is characterized in that, it is characterized in that the shape of the lower part of the upper part of lens and lens is determined by following:
(1) distance of target illumination identity distance LED is d, and the total light flux of led light source is Q, and central light strength is I
0=Q/ π; θ is the projection of emergent ray on XOY plane and the angle of X-axis in the coordinate system,
Angle for emergent ray and Z axis positive direction; Determine that with plane, YOZ place for the upper part of lens, the radius of establishing part circular on the illuminated area is r
UpCoordinate to illuminated area carries out discretization, at first radius of circle r
UpBe divided into n part, r
iRadius r behind the expression five equilibrium
UpI part, 0＜i＜n wherein; Then equally take the illuminated area central point as the center of circle, respectively with r
iDraw circle for radius, the field of illumination is divided into the part circular ring belt area, on the target illumination zone, the energy of every a part circular ring belt area is:
In the formula, E
uK
iThe expression brightness value is according to the GB requirement, so constant E is set
uFor default brightness value, in conjunction with variable k
iBe used for controlling the brightness value size of appointed area on the illuminated area, in order to form predetermined Illumination Distribution, wherein, 0≤k
i≤ 1, k
iValue size need to set according to illumination requirement on the illuminated area, as for brightest area k
iSpan be 0.9-1, for fringe region k
iSpan be 0-0.1;
In like manner, for the lower part of lens, the radius of the part circular on the illuminated area is r
DownCoordinate to illuminated area carries out discretization, namely radius of circle r
DownBe divided into m part, r
jRadius r behind the expression five equilibrium
DownJ part, wherein, 0＜j≤m is divided into the field of illumination part circular ring belt area at last; On the target illumination zone, the energy of every a part circular ring belt area is:
In the formula, constant E
dBe default brightness value, variable k
jBe illumination control parameter, E
dAnd k
jValue and E mentioned above
uAnd k
iIn like manner;
(2) for the upper part of lens, the solid angle of light source center part is carried out discretization, namely
Be divided into n part,
Expression
I part,
With r
iCorresponding one by one; Equally, the solid angle of light source periphery is carried out discretization,
Be divided into n part,
Expression
I part,
With r
iCorresponding one by one;
For the upper part of lens, before light is injected lens, the luminous flux E of the every a angle inner light source of light source center part
UcLuminous flux E with the every a angle inner light source of light source periphery
UlTotal light flux be:
Have according to the conservation of energy:
E
up＝E
uc+E
ul
Unite above-mentioned variously, obtain corresponding
With
In like manner, for the lower part of lens, the solid angle of light source center part is carried out discretization, namely
Be divided into m part,
Expression
J part,
With r
jCorresponding one by one; Equally, with the solid angle of light source periphery
Carry out discretization,
Be divided into m part,
Expression
I part,
With r
jCorresponding one by one; Before light is injected lens, the luminous flux E of the every a angle inner light source of light source center part
DcLuminous flux E with the every a angle inner light source of light source periphery
DlTotal light flux be:
Wherein, the span of θ is 202 °-356 °; Have according to the conservation of energy:
E
down＝E
dc+E
dl
Unite above-mentioned variously, obtain corresponding
With
(3) draw the normal vector of putting on the described curved surface by the catadioptric law, utilize this normal vector to get tangent line, the intersection point by tangent line and incident ray obtains the coordinate put on the curve, and the vector form of catadioptric law can be expressed as:
Wherein,
Be the incident ray unit vector,
Be the emergent ray unit vector,
Be unit normal vector, n is the index of refraction in lens;
For the upper part of lens, determine first the calculating initial point of lens, initial point definite as follows: initial point
Value is 0 °, choose the cavity top free form surface height of lens inboard, this has highly determined the size of whole lens, then choose suitable lens thickness according to the height of this free form surface again, can be calculated the first free curve and the first straight line by these two initial values, these two line segments are on the YOZ plane, what the first free curve represented is the curve of free form surface on the YOZ plane at part inner chambers top on the lens, what the first straight line represented is the straight line of plane on the YOZ plane of lens top minute outside top, and last some correspondence of this first free curve and the first straight line
Value all is 60 °;
The periphery of then definite lens on the YOZ plane, is crossed last point of the first free curve and is made second straight line vertical with Y-axis equally, and the size of the second straight line and Y-axis intersection value is the caliber size of lens inner chambers, this some correspondence
Value is 90 °, and this second straight line represents is that the cylinder of the inboard chamber of part wall on the lens is at the straight line on the YOZ plane; Lens periphery part free form surface initial point
Value is made as 90 °, and by calculating second free curve that is positioned on the YOZ plane, what this second free curve represented is that lens top divides the outside the peripheral curve of free form surface on the YOZ plane;
Lower part for lens, according to top selected lens cavity top free form surface height and lens thickness, calculate the 3rd free curve and the 3rd straight line of lens centre part, the 3rd free curve represents is curve on the free form surface at part inner chambers top under the lens, and the 3rd straight line represents is straight line on the plane of lens bottom minute outside top; Obtain equally the 4th straight line of lens periphery part and four selfs by curve, the 4th straight line represents is the cylinder of the inboard chamber of part wall under the lens straight line of being taken in, and what four selfs were represented by curve is that the curve on the peripheral free form surface in the outside is divided in the lens bottom;
(4) the upper and lower two-part discrete point coordinate of the lens that obtain is imported to respectively mechanical modeling software, fit to eight line segments that are positioned on the YOZ plane, wherein four is straight line, and four is free curve; Make four line segments of part on the lens be combined into a continuous sectional curve, then make this curve around 94 ° of Z axis positive direction rotations, again around 112 ° of Z axis negative direction rotations, namely obtain the shape of part on the lens; Make four line segments of part under the lens be combined into a continuous sectional curve, then make this curve around 68 ° of Z axis positive direction rotations, again around 86 ° of Z axis negative direction rotations, namely obtain the shape of part under the lens; By the upper and lower two parts of lens are processed match, finally obtain the optical lens with free curved surface shape of LED motorcycle dipped headlights.
4. the optical lens with free curved surface for LED motorcycle dipped headlights according to claim 2 is characterized in that, described some O and the distance of putting between o are 25m.
5. the optical lens with free curved surface for LED motorcycle dipped headlights according to claim 2 is characterized in that, for the free form surface of part on the lens, the span of θ is-4 °-202 °; For the lower part of lens, the span of θ is 202 °-356 °.
6. the optical lens with free curved surface for LED motorcycle dipped headlights according to claim 2 is characterized in that,
7. the optical lens with free curved surface for LED motorcycle dipped headlights according to claim 2, it is characterized in that, the field of illumination radius of part is greater than the field of illumination radius of part under the lens on the lens, and the cavity bore of part is greater than the cavity bore of part under the lens on the lens.
8. each described optical lens with free curved surface for LED motorcycle dipped headlights is characterized in that according to claim 1～7, and described lens are made by PMMA or PC or optical glass.
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| CN201210237619.5A CN102901043B (en) | 2012-07-10 | 2012-07-10 | Optical lens with free-form surfaces for LED dipped headlight of motorcycle |
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| CN201210237619.5A CN102901043B (en) | 2012-07-10 | 2012-07-10 | Optical lens with free-form surfaces for LED dipped headlight of motorcycle |
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| CN102901043B CN102901043B (en) | 2015-06-03 |
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Cited By (6)
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| CN105589991A (en) * | 2015-12-05 | 2016-05-18 | 中山市华南理工大学现代产业技术研究院 | Design method of free-form surface integrated optical lens used for LED (Light Emitting Diode) motorcycle headlamp |
| TWI621803B (en) * | 2017-03-06 | 2018-04-21 | T Y C Brother Industrial Co Ltd | Lamp lens |
| CN108906542A (en) * | 2018-07-18 | 2018-11-30 | 深圳市华星光电技术有限公司 | Light source curing units and light source curing system |
| CN108916805A (en) * | 2017-03-22 | 2018-11-30 | 堤维西交通工业股份有限公司 | Lens of car light |
| CN112393136A (en) * | 2020-11-30 | 2021-02-23 | 浙江光锥科技有限公司 | Method for generating 60-degree beam angle lens structure |
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| CN105972538B (en) * | 2016-06-30 | 2018-10-23 | 中山市华南理工大学现代产业技术研究院 | LED motorcycle headlamp Combined lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105589991A (en) * | 2015-12-05 | 2016-05-18 | 中山市华南理工大学现代产业技术研究院 | Design method of free-form surface integrated optical lens used for LED (Light Emitting Diode) motorcycle headlamp |
| CN105589991B (en) * | 2015-12-05 | 2019-06-14 | 中山市华南理工大学现代产业技术研究院 | The design method of LED motorcycle headlamp free form surface integrated optics lens |
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| CN108916805A (en) * | 2017-03-22 | 2018-11-30 | 堤维西交通工业股份有限公司 | Lens of car light |
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| CN108906542A (en) * | 2018-07-18 | 2018-11-30 | 深圳市华星光电技术有限公司 | Light source curing units and light source curing system |
| CN112393136A (en) * | 2020-11-30 | 2021-02-23 | 浙江光锥科技有限公司 | Method for generating 60-degree beam angle lens structure |
| CN112503434A (en) * | 2020-12-01 | 2021-03-16 | 浙江光锥科技有限公司 | Method for generating lens structure capable of freely distributing light within 48 degrees and lens structure |
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