CN205316246U - Optical lens that LED car front fog lamp was used - Google Patents
Optical lens that LED car front fog lamp was used Download PDFInfo
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- CN205316246U CN205316246U CN201521008115.1U CN201521008115U CN205316246U CN 205316246 U CN205316246 U CN 205316246U CN 201521008115 U CN201521008115 U CN 201521008115U CN 205316246 U CN205316246 U CN 205316246U
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Abstract
The utility model discloses an optical lens that LED car front fog lamp was used, there is a cavity that is used for placing the LED light source lens inboard, and it is luminous that the LED light source faces the lens cavity, LED central part's light, this part light is the ball face at process cavity inner wall top earlier, and when getting into lens inside, ray direction does not change, then the emergence of the free -form surface in the middle of top refraction outside lens, and the formation emergent light shines on the face of illumination, the refraction takes place at the cylinder of lens cavity inner wall earlier and gets into lens for LED marginal portion's light, this part light, then the total reflection free -form surface in the lens outsides takes place the total reflection, and last ring plane at lens top edges produces the refraction, shines on the illumination face. The utility model discloses a lens simple structure is compact, and is small, and the efficiency of light energy utilization is high, and the glare effect is low, and has reached the grading requirement of ECE R19 rev15 " F3 " level car front fog lamp.
Description
Technical field
The utility model relates to LED automobile illumination field, in particular to the optical lens with free curved surface for automobile LED front fog lamp.
Background technology
The advantages such as photodiode (LED) has life-span length, efficiency height, response is fast, volume is little, are widely used in vehicle light illumination field in recent years. Along with the continuous innovation of LED technology, the development trend that LED car lamp will be the application of car lighting from now on. But LED is applied to front fog lamp of automobile still has bigger challenge, and the efficiency of light energy utilization also needs further raising.
The luminous intensity distribution performance of front fog lamp of automobile has been done very detailed definition and requirement by Economic Commission for Europe of United Nations automobile regulation (ECER19Rev15). Initial front fog lamp is also exactly that " B " level front fog lamp fills the light source specified with GB15766.1 or R37 only. And " F3 " level front fog lamp " B " level relatively, improve luminous intensity distribution performance, increase the width of light beam, it is to increase the minimum light intensity values below H H line, increasing the largest light intensity requirement on control ground, front, the light intensity value more than H H line then reducing fuzzy light is to improve visibility meter simultaneously.
Practical novel content
The utility model provides a kind of optical lens with free curved surface for automobile LED front fog lamp, this optical lens volume is little, easy for installation, can effectively control the diverging light that LED sends, capacity usage ratio height, dazzle is low, can meet ECER19Rev15 to the light distribution requirements of " F3 " level front fog lamp of automobile simultaneously.
The utility model is by the following technical solutions.
An optical lens for automobile LED front fog lamp, has a cavity inside described optical lens, this cavity can be used for placing LED/light source; LED/light source faces lens cavity luminescence; Using described optical lens towards the side of illuminated area as top; The cavity top of described optical lens is ball face, and ball face is a part for spherical shape, and cavity inner side-wall is cylinder; Being the free curved surface in top in the middle of the outside top of optical lens, the outside of optical lens is the free curved surface of total reflection, and the edge of the outside top of optical lens is circular planes; The light sent from LED/light source is divided into two portions, LED center part light first through the ball face at cavity inwall top, when entering lens interior, radiation direction does not change, then the free curved surface in top outside lens reflects, and forms emergent light, is irradiated on illuminated area;The light of LED/light source edge section first enters lens in the cylinder generation refraction of cavity inwall, and then the described free curved surface of total reflection outside lens is totally reflected, and finally circular planes generation on lens top reflects, and is irradiated on illuminated area.
Further, the free curve form in the top of lens and the free curve form of total reflection limit as follows:
Taking LED/light source as the system of coordinates of true origin O, LED/light source light-emitting area place plane is xoy plane, crosses initial point and axle with xoy plane orthogonal is z-axis, taking z-axis positive dirction as optical axis direction; Be O ' and the plane being parallel to plane xoy with z-axis intersection point it is target illuminated area, the central point that some O ' is target illuminated area; LED/light source total light flux is Φ, and central light strength is I0=Φ/π;
The distance in electric light source and lighting face is H, LED/light source light-emitting 3 D angle is carried out angle equal portions division, whereinFor the angle of outgoing light and z-axis, θ is the angle of the projection of outgoing light in xoy plane and x-axis; By the solid angle of light source center partBeing divided into m part, each part of expression isEachThe angle theta of the projection of corresponding outgoing light in xoy plane and x-axiscAlso corresponding being divided into n part, each part represents for θc(i, j), j=1～n, namely for i-th, j part, be expressed asAnd θc(i, j) array;
Equally, by the solid angle of light source edge sectionIt is divided into m part, for eachAll by θeBe divided into n part, namely for i-th, j part, be expressed asAnd θe(i, j) array;
Rectangular area light area on illuminated area being set as 1 °, below sea line, luminous energy mainly concentrates on the 10 ° of position parts in middle left and right; Corresponding to the division of light source solid angle, the rectangular coordinates of target illuminated area is also divided into m part accordingly in y-direction, for each part of y, all x direction is divided into n part, obtains and array in light source solid angle in target illuminated area rectangular coordinate systemAnd θc(i,j)、And θe(i, j) be y one to onec(i) and xc(i,j)、ye(i) and xe(i, j) array;
For LED/light source centre portions light, owing to light area is the rectangular area of 1 °, below sea line, this rectangular area is only symmetrical about y-axis, and x-axis is asymmetric, therefore need to separate two portions when determining the free curved surface of lensed tip: θ=0～π and θ=π～2 π; Taking Mei Tiaochang rectangular area, x-axis direction, light area as research object, it is contemplated that θ=0～π part, it is assumed that the average illumination of rectangular area is Ev, then have
In formula, a, b are length and the width in illumination rectangular illumination region;
For long rectangular area, i-th, x-axis direction, light area, can obtain according to law of conservation of energy:
Obtain by above two formulasWith ycI the corresponding relation of (), then, using each lattice of light area as research object, obtains following formula according to energy conservation:
In formula, E0·ki,jRepresent the illumination value of the i-th row j row grid, according to the standard-required of front fog lamp of automobile, preset illumination value E0, illumination controlling elements k is seti,jControl the illumination value size of designated area on illuminated area; θ is obtained by above three formulasc(i, j) and xcThe relation of (i, j), namely have found on described lens the energy conservation relation between grid on each solid angle unit and illuminated area;
For θ=π～2 π part, only then can need to obtain the limit of integration of θ is changed into π～2 π by above integration typeWith yc(i)、θc(i, j) and xcThe corresponding relation of (i, j);
Equally, it is contemplated that during LED/light source rim ray,Limit of integration beθ is also divided into θ=0～π and θ=π～2 π two portions to calculate, and uses aforementioned manner to obtainWith ye(i)、θe(i, j) and xeThe corresponding relation of (i, j);
Determining the method vector of point on described curved surface by catadioptric law, utilize this normal direction amount to obtain section, by asking the intersection point in section and incident beam to obtain the coordinate of point on curved surface, described catadioptric law formula is as follows:
In formula,For incident beam vector of unit length,For outgoing light vector of unit length,For free curved surface certain a bit on unit normal vector, n is specific refractory power, when there is total reflection, n=1;
First determine point of beginning, if point of beginningValue is 0 °, is h with the distance of initial point, and this distance determines the thickness of whole lens; The vector of unit length of emergent light byRepresent with θ, obtain by law of conservation of energyWith yc(i)、θc(i, j) and xcThe corresponding relation of (i, j), the i.e. corresponding relation of incident beam and outgoing light, thus obtain the direction vector of outgoing light; By the vector of unit length of the coordinate of point of beginning and the outgoing light corresponding with it, obtain the normal vector of point of beginning, so that it is determined that the section of this point, this section is crossing with the incident beam of second point so that it is determined that second point, draw subsequent point by the straight line intersection in the section of former point and the normal direction amount place of subsequent point, obtain the free Surface tessellation point of lensed tip by iteration;
Then the free curved surface of the total reflection outside lens is determined, now point of beginningValue is 90 °, and coordinate is (d, 0,0), d andSize determine the diameter of lens; Equally, from point of beginning, draw subsequent point by the straight line intersection in the section of former point and the normal direction amount place of subsequent point, obtain the free Surface tessellation point of total reflection outside lens by iteration; Obtain two free curved surfaces further by discrete point, then in conjunction with the ball face of cavity and cylinder, finally obtain free-form surface lens structure.
Further,D=8mm; The distance of described initial point O and some O ' is 25m.
The described optical lens with free curved surface for automobile LED front fog lamp, it is possible to be made up of PC or PMMA or opticglass.
Compared with prior art, advantage of the present utility model has:
Lens arrangement of the present utility model is simply compact, the structure limited makes luminous energy all outgoing after free-form surface lens catadioptric that LED/light source sends, it is not necessary to luminous intensity distribution assisted by other element, decreases the luminous energy loss of system, it is to increase the efficiency of light energy utilization. The inner side of lens is a cavity, is convenient to the installation of LED/light source and heat-removal system. The volume of lens is little, and glare effect is low, and reaches the light distribution requirements of ECER19Rev15 " F3 " level front fog lamp of automobile.
Accompanying drawing explanation
Fig. 1 is front fog lamp of automobile optical system coordinate schematic diagram in enforcement mode.
Fig. 2 is the spherical coordinates schematic diagram at LED/light source light-emitting 3 D angle in enforcement mode.
Fig. 3 is the two-dimensional representation of optical system luminous intensity distribution principle in enforcement mode.
Fig. 4 is that in enforcement mode, target illumination field divides schematic diagram.
Fig. 5 is the 3 D stereo front elevational schematic of lens in enforcement mode.
Fig. 6 is the 3 D stereo elevational schematic view of lens in enforcement mode.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail, but enforcement of the present utility model and protection are not limited to this.
1. set up system of coordinates with setting starting condition and evenly to be divided at LED/light source light-emitting 3 D angle
First, as shown in Figure 1, setting up the system of coordinates as true origin O taking the center of LED/light source light-emitting area 101, LED/light source light-emitting area place plane is xoy plane, crosses initial point and axle with xoy plane orthogonal is z-axis, taking z-axis positive dirction as optical axis direction.And z-axis intersection point is O ' (distance between initial point O and some O ' is 25m) and the plane being parallel to plane xoy is target illuminated area 200, the central point that some O ' is target illuminated area. As shown in Figure 2,For the angle of LED outgoing light and z-axis, θ is the angle of the projection of outgoing light in xoy plane and x-axis. By the solid angle of light source center part(in this exampleIt is set to) it is divided into m part, for eachAll by θcIt is divided into n part, namely for the i-th, j part, it is possible to be expressed asAnd θc(i, j) array.
Equally, by the solid angle of light source edge section(in this exampleIt is set to) it is divided into m part, for eachAll by θeIt is divided into n part, namely for the i-th, j part, it is possible to be expressed asAnd θe(i, j) array.
As shown in optical system luminous intensity distribution principle two-dimensional representation in Fig. 3, having a cavity inside lens 300, this cavity can be used for placing LED/light source 100, and LED/light source faces lens cavity luminescence. Using described lens towards the side of illuminated area as top. The light sent from LED/light source is divided into two portions respectively by free curved surface that this optical lens two is different, it is achieved light distribution requirements. LED center part light, spread angle range isThis part light is first through the ball face 301 at cavity inwall top, and when entering lens interior, radiation direction does not change, and then free curved surface 303 in lens outside top reflects, and forms emergent light, is irradiated on illuminated area 200; The light of LED edge section, spread angle range isThis part light first occurs refraction to enter lens at the cylinder 302 of cavity inwall, and then the free curved surface 304 outside lens is totally reflected, and finally circular planes 305 on lens top produces to reflect, and is irradiated on illuminated area 200.
2. pair target illumination field divides
According to the Illumination Distribution characteristic of front fog lamp of automobile on illuminated area, it is possible to the light area on illuminated area is set as the rectangular area of 1 °, below sea line, as shown in Figure 4. Luminous intensity distribution light type scope is relatively wide, and luminous energy mainly concentrates on the 10 ° of position parts in middle left and right. Corresponding to the division of light source solid angle, the rectangular coordinates of target illuminated area is also divided into m part accordingly in y-direction, for each part of y, all x direction is divided into n part, obtains and array in light source solid angle in target illuminated area rectangular coordinate systemAnd θc(i,j)、And θe(i, j) be y one to onec(i) and xc(i,j)、ye(i) and xe(i, j) array.
First consider light source center part light. Owing to light area is the rectangular area of 1 °, below sea line, this rectangular area is only symmetrical about y-axis, and x-axis is asymmetric, therefore need to separate two portions when the free curved surface of calculating lensed tip: θ=0～π and θ=π～2 π. Taking Mei Tiaochang rectangular area, x-axis direction, light area as research object, it is contemplated that θ=0～π part, it is assumed that the average illumination of rectangular area is Ev, then have
In formula, a, b are length and the width in illumination rectangular illumination region.
For long rectangular area, i-th, x-axis direction, light area, can obtain according to law of conservation of energy:
Can obtain by above two formulasWith ycThe corresponding relation of (i). Then, using each lattice of light area as research object, following formula can be obtained according to energy conservation:
In formula, E0·ki,jRepresent the illumination value of the i-th row j row grid, according to the standard-required of front fog lamp of automobile, preset illumination value E0, illumination controlling elements k is seti,jControl the illumination value size of designated area on illuminated area. θ can be obtained by above three formulasc(i, j) and xcThe relation of (i, j), namely have found in designed lens the energy conservation relation between grid on each solid angle unit and illuminated area.
For θ=π～2 π part, only then can need to obtain the limit of integration of θ is changed into π～2 π by above integration typeWith yc(i)、θc(i, j) and xcThe corresponding relation of (i, j).
Equally, it is contemplated that during LED/light source rim ray,Limit of integration beθ is also divided into θ=0～π and θ=π～2 π two portions to calculate, and uses above method to obtainWith ye(i)、θe(i, j) and xeThe corresponding relation of (i, j).
3. the coordinate of discrete point on free curved surface is calculated by catadioptric law
Obtaining the method vector of point on described curved surface by catadioptric law, utilize this method vector to try to achieve section, by asking the intersection point in section and incident beam to obtain the coordinate of point on curved surface, described catadioptric law formula is as follows:
In formula,For incident beam vector of unit length,For outgoing light vector of unit length,For free curved surface certain a bit on unit normal vector, n is specific refractory power, when there is total reflection, n=1.
First determine point of beginning, if point of beginningValue is 0 °, is h with the distance of initial point, and this distance determines the thickness of whole lens. The vector of unit length of emergent light can be byRepresent with θ, obtain by law of conservation of energyWith yc(i)、θc(i, j) and xcThe corresponding relation of (i, j), the i.e. corresponding relation of incident beam and outgoing light, such that it is able to obtain the direction vector of outgoing light. By the vector of unit length of the coordinate of point of beginning and the outgoing light corresponding with it, it is possible to obtain the normal vector of point of beginning, so that it is determined that the section of this point, this section is crossing with the incident beam of second point so that it is determined that second point. Subsequent point can be drawn by the straight line intersection in the section of former point and the normal direction amount place of subsequent point, the coordinate of the free Surface tessellation point of lensed tip can be drawn by computer iterations.
Then the free curved surface of total reflection outside lens is calculated. Now point of beginningValue is 90 °, and coordinate is (d, 0,0), d andSize determine the diameter of lens. Equally, from point of beginning, subsequent point can be drawn by the straight line intersection in the section of former point and the normal direction amount place of subsequent point, the coordinate being totally reflected free Surface tessellation point outside lens can be drawn by computer iterations.
4. utilize mechanical modeling software that the point obtained is fitted to curved surface
The discrete point coordinate calculated is imported in mechanical modeling software respectively, two free curved surfaces 303,304 are obtained by linear interpolation matching or sampling interpolation, recycling mechanical modeling software adds sphere 301 and the cylinder 302 of lens inner chambers, the solid model 300 of free-form surface lens is produced, as shown in Figure 5 finally by setting-out curved surface and combination of entities. Fig. 6 show the 3 D stereo elevational schematic view of lens.
Above automobile LED front fog lamp optical lens with free curved surface provided by the utility model is described in detail, the luminous energy that LED/light source sends is outgoing after this free-form surface lens catadioptric all, other element is not needed to assist luminous intensity distribution, decrease the luminous energy loss of system, it is to increase the efficiency of light energy utilization. The inner side of lens is a cavity, is convenient to the installation of LED/light source and heat-removal system. The volume of lens is little, and glare effect is low, can reach the light distribution requirements of ECER19Rev15 " F3 " level front fog lamp of automobile simultaneously. The utility model applies various model diagram embodiment set forth, the foregoing is only the better feasible examples of implementation of the utility model. For the technician of this area, according to thought of the present utility model, all it is improved part in specific embodiments and applications.In sum, this description should not be construed as restriction of the present utility model.
Claims (3)
1. the optical lens of an automobile LED front fog lamp, it is characterised in that have a cavity inside described optical lens, this cavity can be used for placing LED/light source; LED/light source faces lens cavity luminescence; Using described optical lens towards the side of illuminated area as top; The cavity top of described optical lens is ball face, and ball face is a part for spherical shape, and cavity inner side-wall is cylinder; Being the free curved surface in top in the middle of the outside top of optical lens, the outside of optical lens is the free curved surface of total reflection, and the edge of the outside top of optical lens is circular planes; The light sent from LED/light source is divided into two portions, LED center part light first through the ball face at cavity inwall top, when entering lens interior, radiation direction does not change, then the free curved surface in top outside lens reflects, and forms emergent light, is irradiated on illuminated area; The light of LED/light source edge section first enters lens in the cylinder generation refraction of cavity inwall, and then the described free curved surface of total reflection outside lens is totally reflected, and finally circular planes generation on lens top reflects, and is irradiated on illuminated area.
2. the optical lens of a kind of automobile LED front fog lamp according to claim 1, it is characterised in that the free curve form in the top of lens and the free curve form of total reflection limit as follows:
Taking LED/light source as the system of coordinates of true origin O, LED/light source light-emitting area place plane is xoy plane, crosses initial point and axle with xoy plane orthogonal is z-axis, taking z-axis positive dirction as optical axis direction; Be O ' and the plane being parallel to plane xoy with z-axis intersection point it is target illuminated area, the central point that some O ' is target illuminated area; LED/light source total light flux is Φ, and central light strength is I0=Φ/π;
The distance in electric light source and lighting face is H, LED/light source light-emitting 3 D angle is carried out angle equal portions division, whereinFor the angle of outgoing light and z-axis, θ is the angle of the projection of outgoing light in xoy plane and x-axis; By the solid angle of light source center partBeing divided into m part, each part of expression isI=1～m, eachThe angle theta of the projection of corresponding outgoing light in xoy plane and x-axiscAlso corresponding being divided into n part, each part represents for θc(i, j), j=1～n, namely for i-th, j part, be expressed asAnd θc(i, j) array;
Equally, by the solid angle of light source edge sectionIt is divided into m part, for eachAll by θeBe divided into n part, namely for i-th, j part, be expressed asWithArray;
Rectangular area light area on illuminated area being set as 1 °, below sea line, luminous energy mainly concentrates on the 10 ° of position parts in middle left and right; Corresponding to the division of light source solid angle, the rectangular coordinates of target illuminated area is also divided into m part accordingly in y-direction, for each part of y, all x direction is divided into n part, obtains and array in light source solid angle in target illuminated area rectangular coordinate systemAnd θc(i,j)、And θe(i, j) be y one to onec(i) and xc(i,j)、ye(i) and xe(i, j) array;
For LED/light source centre portions light, owing to light area is the rectangular area of 1 °, below sea line, this rectangular area is only symmetrical about y-axis, and x-axis is asymmetric, therefore need to separate two portions when determining the free curved surface of lensed tip: θ=0～π and θ=π～2 π; Taking Mei Tiaochang rectangular area, x-axis direction, light area as research object, it is contemplated that θ=0～π part, it is assumed that the average illumination of rectangular area is Ev, then have
In formula, a, b are length and the width in illumination rectangular illumination region;
For long rectangular area, i-th, x-axis direction, light area, can obtain according to law of conservation of energy:
Obtain by above two formulasWith ycI the corresponding relation of (), then, using each lattice of light area as research object, obtains following formula according to energy conservation:
In formula, E0·ki,jRepresent the illumination value of the i-th row j row grid, according to the standard-required of front fog lamp of automobile, preset illumination value E0, illumination controlling elements k is seti,jControl the illumination value size of designated area on illuminated area; θ is obtained by above three formulasc(i, j) and xcThe relation of (i, j), namely have found on described lens the energy conservation relation between grid on each solid angle unit and illuminated area;
For θ=π～2 π part, only then can need to obtain the limit of integration of θ is changed into π～2 π by above integration typeWith yc(i)、θc(i, j) and xcThe corresponding relation of (i, j);
Equally, it is contemplated that during LED/light source rim ray,Limit of integration beθ is also divided into θ=0～π and θ=π～2 π two portions to calculate, and uses aforementioned manner to obtainWith ye(i)、θe(i, j) and xeThe corresponding relation of (i, j);
Determining the method vector of point on described curved surface by catadioptric law, utilize this normal direction amount to obtain section, by asking the intersection point in section and incident beam to obtain the coordinate of point on curved surface, described catadioptric law formula is as follows:
In formula,For incident beam vector of unit length,For outgoing light vector of unit length,For free curved surface certain a bit on unit normal vector, n is specific refractory power, when there is total reflection, n=1;
First determine point of beginning, if point of beginningValue is 0 °, is h with the distance of initial point, and this distance determines the thickness of whole lens; The vector of unit length of emergent light byRepresent with θ, obtain by law of conservation of energyWith yc(i)、θc(i, j) and xcThe corresponding relation of (i, j), the i.e. corresponding relation of incident beam and outgoing light, thus obtain the direction vector of outgoing light; By the vector of unit length of the coordinate of point of beginning and the outgoing light corresponding with it, obtain the normal vector of point of beginning, so that it is determined that the section of this point, this section is crossing with the incident beam of second point so that it is determined that second point, draw subsequent point by the straight line intersection in the section of former point and the normal direction amount place of subsequent point, obtain the free Surface tessellation point of lensed tip by iteration;
Then the free curved surface of the total reflection outside lens is determined, now point of beginningValue is 90 °, and coordinate is (d, 0,0), d andSize determine the diameter of lens; Equally, from point of beginning, draw subsequent point by the straight line intersection in the section of former point and the normal direction amount place of subsequent point, obtain the free Surface tessellation point of total reflection outside lens by iteration; Obtain two free curved surfaces further by discrete point, then in conjunction with the ball face of cavity and cylinder, finally obtain free-form surface lens structure.
3. the optical lens of a kind of automobile LED front fog lamp according to claim 2, it is characterised in that,D=8mm; The distance of described initial point O and some O ' is 25m.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106152051A (en) * | 2016-07-29 | 2016-11-23 | 宁波永新光学股份有限公司 | Lens and the method for designing of these lens for microscope LED light device |
| CN106764783A (en) * | 2016-11-24 | 2017-05-31 | 武汉通畅汽车电子照明有限公司 | A kind of headlight for automobile |
| CN112050167A (en) * | 2020-08-10 | 2020-12-08 | 复旦大学 | Machine vision illumination lens for generating customized light spots and design method thereof |
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2015
- 2015-12-05 CN CN201521008115.1U patent/CN205316246U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106152051A (en) * | 2016-07-29 | 2016-11-23 | 宁波永新光学股份有限公司 | Lens and the method for designing of these lens for microscope LED light device |
| CN106764783A (en) * | 2016-11-24 | 2017-05-31 | 武汉通畅汽车电子照明有限公司 | A kind of headlight for automobile |
| CN112050167A (en) * | 2020-08-10 | 2020-12-08 | 复旦大学 | Machine vision illumination lens for generating customized light spots and design method thereof |
| CN112050167B (en) * | 2020-08-10 | 2022-12-20 | 复旦大学 | Machine vision illumination lens for generating customized light spots and design method thereof |
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Granted publication date: 20160615 Termination date: 20211205 |