CN112483990B - Headlamp device and vehicle - Google Patents

Headlamp device and vehicle Download PDF

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Publication number
CN112483990B
CN112483990B CN201910861680.9A CN201910861680A CN112483990B CN 112483990 B CN112483990 B CN 112483990B CN 201910861680 A CN201910861680 A CN 201910861680A CN 112483990 B CN112483990 B CN 112483990B
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focus
free
curve
focal point
form surface
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CN112483990A (en
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李红
蒋金波
宋新新
王金秋
孙亚轩
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BYD Co Ltd
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BYD Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Abstract

The invention provides a headlamp device which comprises a free-form surface ellipsoidal reflector, a light source, a baffle and a free-form surface projection lens, wherein a focus F0, a focus F1 and a focus F2 are formed between the free-form surface ellipsoidal reflector and the free-form surface projection lens, the focus F1 is positioned between the focus F2 and the focus F0, the cutting curves of the reflecting surface of the free-form surface ellipsoidal reflector passing through the central axis are all elliptic curves, the near focuses of the cutting curves of the free-form surface ellipsoidal reflector passing through different directions of the central axis are positioned at the same focus F0, the far focus is gradually changed from the focus F1 to the focus F2, the focus of the vertical section of the free-form surface projection lens is a single focus positioned at the focus F1, and the focus of the horizontal section of the free-form surface projection lens is gradually changed from the focus F1 to the focus F2. Meanwhile, the invention also discloses a vehicle comprising the headlamp device. The headlamp device provided by the invention improves the irradiation width and the middle irradiation distance at two sides of the vehicle.

Description

Headlamp device and vehicle
Technical Field
The invention belongs to the technical field of vehicle lighting devices, and relates to a headlamp device and a vehicle.
Background
The existing projection type automobile headlamp system is widely used due to clear cut-off line and compact structure, and mainly comprises a light source, a reflector, a baffle and a projection objective. In the prior art, a reflector generally adopts a single-focus ellipsoidal reflector, and a projection objective generally adopts a single-focus aspheric lens.
In the prior art, due to the adoption of a single-focus ellipsoidal reflector and a single-focus aspheric lens, a circular light spot is formed at the position of a light blocking sheet, after a light and shade cut-off line is cut by the light blocking sheet, the projected light spot is basically a semicircle with a half of the upper part cut off, and the semicircular light spot can cause too much energy waste and short irradiation near the lower part of a road surface. The main reasons are as follows: because the distance from the position of the car lamp to the ground is only about 1 meter at most, and the irradiation distance needs to reach at least dozens of meters, most of light rays can be caused to be emitted to the road surface which is close to the front of the car and is relatively close to the front of the car by the semicircular light spots, the maximum light intensity of the central points of the light spots is not strong enough, and the width of the light spots is not enough. Namely, the distance of light spot irradiation is not long enough, and the light irradiation intensity at the two sides of the road surface is not enough.
Disclosure of Invention
The invention provides a headlamp device and a vehicle, aiming at the problems of low light intensity of a light spot center and insufficient irradiation width of the conventional projection type automobile headlamp system.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in one aspect, the present invention provides a headlamp apparatus, including a free-form surface ellipsoidal reflector, a light source, a baffle plate, and a free-form surface projection lens, wherein a focus F0, a focus F1, and a focus F2 are formed between the free-form surface ellipsoidal reflector and the free-form surface projection lens, the focus F1 is located between the focus F2 and the focus F0, the light source is located at the focus F0, the sectional curves of the reflection surface of the free-form surface ellipsoidal reflector passing through the central axis are all elliptic curves, the near focuses of the sectional curves of the free-form surface ellipsoidal reflector passing through different directions of the central axis are located at the same focus F0, the gradually changing far focus is located between the focus F1 and the focus F2, the far focus of the vertical sectional curve of the free-form surface ellipsoidal reflector is located at the focus F1, and the far focus of the horizontal sectional curve of the free-form surface ellipsoidal reflector is located at the focus F2, the baffle is located at the focal point F1, the focal point of the vertical section of the free-form surface projection lens is a single focal point located at the focal point F1, and the focal point of the horizontal section of the free-form surface projection lens is gradually changed from the focal point F1 to the focal point F2.
Optionally, the distance between the focus F1 and the focus F2 is 3-20 mm.
Optionally, the focus F0, the focus F1, and the focus F2 are all located on a central axis of the free-form ellipsoidal mirror.
Optionally, an incident plane S1 and an exit curved surface S2 are respectively formed on two sides of the free-form surface projection lens, the incident plane S1 faces the free-form surface ellipsoidal reflector, the exit curved surface S2 faces away from the free-form surface ellipsoidal reflector, a focus of a vertical sectioning curve S22 of the exit curved surface S2 is located at a focus F1, a focus corresponding to a central portion of a horizontal sectioning curve S21 of the exit curved surface S2 is located at a focus F1, focuses corresponding to two side edge portions of a horizontal sectioning curve S21 of the exit curved surface S2 are located at a focus F2, and the focuses corresponding to the two side edge portions from the central portion to the two side edge portions of the horizontal sectioning curve S21 of the exit curved surface S2 are sequentially arranged between the focus F1 and the focus F2.
Optionally, the vertical cutting curve S22 is a spherical curve or an aspheric curve.
Optionally, the vertical sectioning curve S22 is an aspheric curve, the vertical sectioning plane of the exit curved surface S2 is taken as a ZY-axis coordinate system, and a point (Z) on the vertical sectioning curve S22 of the exit curved surfacei，Yi) The following formula is satisfied:
Figure GDA0003492838640000021
where c is the curvature, k is the conic constant, a1, a2, a3, a4 … are the high order term coefficients.
Optionally, the horizontal section plane of the exit curved surface S2 is taken as a ZX axis coordinate system, and the point C on the horizontal section curve S21 of the exit curved surface S2i(Xi，Zi) Is determined by:
taking a series of sampling light rays at equal intervals, equally dividing an area between the focus F1 and the focus F2 into N sections, equally dividing the caliber R of the lens into N sections, equally dividing F1 into the position of the focus F1, F2 into the position of the focus F2, fi into the ith focus position corresponding to the sampling light rays, Ri into the intersection point of the sampling light rays and an incidence plane S1, Ci into the intersection point of the sampling light rays and a horizontal sectioning curve S21, and the coordinate of the intersection point is (X) Xi，Zi)，
Figure GDA0003492838640000022
In order to obtain the incident angle of the sampled light at Ri, δ is the emergent angle of the sampled light at Ri, and the corresponding relationship is shown as the following formula:
Figure GDA0003492838640000023
according to the snell's law of refraction, the refractive index of the lens material is n, and the corresponding relationship is shown by the following formula:
Figure GDA0003492838640000031
the sampling light is refracted again when reaching the exit curved surface S2 and finally exits in parallel with the Z axis, omega is the incident angle of the sampling light at the position of the Ci point, theta is the reflection angle, delta is the included angle with the Z axis, and according to the refraction law of the position of the Ci point, the following relation formula is provided:
Figure GDA0003492838640000032
from the trigonometric relationship of equation (3), it can be derived:
Figure GDA0003492838640000033
since the tangent to the horizontal cut curve S21 at point Ci also includes an angle θ with the X-axis, the above equations (1) to (4) are combined according to θ ═ ω + δ: while according to the tangentCut value
Figure GDA0003492838640000034
Let Ci-1 be the point just before Ci, whose coordinates are (X)i-1，Zi-1) Then:
Figure GDA0003492838640000035
joint formulae (1) to (5), and initial condition X0When equal to 0, Z0Each point (X) on the profile of the horizontally cut curve S21 is obtained (lens thickness)i，Zi) The coordinate values of (2).
Optionally, a Z-shaped stop line is arranged at the top of the baffle.
Optionally, the headlamp device further includes an installation platform, and the free-form surface ellipsoidal reflector, the light source, the baffle, and the free-form surface projection lens are all disposed on the installation platform.
In another aspect, the present invention provides a vehicle including the headlamp apparatus as described above.
According to the headlamp device provided by the invention, the near focuses of all the sectioning curves of the free-form surface ellipsoid reflector are arranged at the same focus F0, meanwhile, the far focuses gradually change from the focus F1 to the focus F2, the light source is arranged at the focus F0, the light emitted by the light source is collected between the focus F1 and the focus F2 through the reflection of the free-form surface ellipsoid reflector, so that an elliptical light spot can be formed at the baffle, after a cut-off line of light and shade is formed through the baffle, the light pattern is adjusted and emitted through the free-form surface projection lens, the headlamp device can form a semi-elliptical headlamp light pattern, the irradiation width at two sides of a vehicle is effectively improved, meanwhile, the collection degree of light rays at a middle point is improved, and the irradiation distance can be effectively improved.
Drawings
Fig. 1 is a schematic structural view of a headlamp apparatus provided in an embodiment of the present invention;
fig. 2 is a schematic view of an internal structure of a headlamp apparatus provided in an embodiment of the present invention;
FIG. 3 is a side view of a free-form projection lens of a headlamp apparatus provided by an embodiment of the present invention;
FIG. 4 is a light path diagram of a horizontal cut curve S21 of the curved exit surface S2 provided by the embodiment of the present invention;
fig. 5 is an analysis diagram of a horizontal section curve S21 of the curved exit surface S2 provided in the embodiment of the present invention;
fig. 6 is a light path diagram of a vertical cut curve S22 of the curved exit surface S2 provided by the embodiment of the present invention.
The reference numbers in the drawings of the specification are as follows:
1. a free-form surface ellipsoidal reflector; 11. a vertical sectioning curve; 12. a horizontal sectioning curve; 2. a free-form surface projection lens; s1, an incident plane; s2, emitting a curved surface; s21, horizontally cutting a curve; s22, vertically cutting a curve; 3. mounting a platform; 4. a light source; 5. and a baffle plate.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "horizontal", "vertical", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 5, an embodiment of the present invention provides a headlamp apparatus including a free-form surface ellipsoidal reflector 1, a light source 4, a baffle 5, and a free-form surface projection lens 2, wherein a focus F0, a focus F1, and a focus F2 are formed between the free-form surface ellipsoidal reflector 1 and the free-form surface projection lens 2, the focus F1 is located between the focus F2 and the focus F0, the light source 4 is located at the focus F0, a cut curve of a reflection surface of the free-form surface ellipsoidal reflector 1 passing through a central axis is an elliptic curve, near focuses of cut curves of the free-form surface ellipsoidal reflector 1 passing through different directions of the central axis are located at the same focus F0, a far focus is located between the focus F1 and the focus F2, a far focus of a vertical curve 11 of the free-form surface ellipsoidal reflector 1 passing through the central axis is located at the focus F1, a far focus of a horizontal curve 12 of the free-form surface ellipsoidal reflector 1 is located at a focus F2, the baffle 5 is located at the focus point F1, the focal point of the vertical section of the free-form surface projection lens is a single focal point located at the focus point F1, and the focal point of the horizontal section of the free-form surface projection lens is gradually changed from the focus point F1 to the focus point F2.
Since the sectioning curves of the reflecting surface of the free-form surface ellipsoidal reflector 1 passing through the central axis are all elliptic curves, the sectioning curves of the reflecting surface of the free-form surface ellipsoidal reflector 1 passing through the central axis all have a near focus and a far focus, and the light emitted from the near focus is converged to the far focus position by the emission principle of the ellipsoidal reflector.
The headlamp device arranges the near focuses of all the sectioning curves of the free-form surface ellipsoid reflector 1 at the same focus F0, and the far focuses gradually change from the focus F1 to the focus F2, the light source 4 is arranged at the focus F0, the light emitted from the light source 4 is converged between the focus F1 and the focus F2 through the reflection of the free-form surface ellipsoid reflector 1, so that an elliptical light spot can be formed at the baffle 5, after a cut-off line of light and shade is formed by the baffle 5, the light type is adjusted to be emitted through the free-form surface projection lens 2, the free-form surface projection lens 2 is used for refracting and emitting the light emitted from the focus F1 to the focus F2 in parallel, and because the light reflected by different sectioning curves of the free-form surface ellipsoid reflector 1 is converged at different positions, the free-form surface projection lens 2 arranges the focus of the vertical section at a single focus at the focus F1, therefore, the light reflected by the vertical sectioning curve 11 of the free-form surface ellipsoidal reflector 1 can be converted into parallel light to be emitted, the focus of the horizontal section of the free-form surface projection lens gradually changes from the focus F1 to the focus F2 and is matched with sectioning curves of the free-form surface ellipsoidal reflector 1 passing through different directions of the central axis, the light reflected by the free-form surface ellipsoidal reflector 1 in different directions is converted into the parallel light to be emitted, and the light shape adjusting effect is achieved.
The headlamp device can form a semi-elliptical headlamp light type, effectively improves the irradiation width of two sides of a vehicle, simultaneously improves the collection degree of middle point light rays, and further can effectively improve the irradiation distance.
The curved surface smooth transition is formed between the vertical sectioning curve 11 and the horizontal sectioning curve 12 of the free-form surface ellipsoidal reflector 1.
In one embodiment, the distance between the focus F1 and the focus F2 is 3 mm to 20 mm.
It should be noted that, in other embodiments, the distance between the focus F1 and the focus F2 can be adjusted appropriately according to the width of the required elliptical light spot and the arrangement of the light sources 4, the aspect ratio of the elliptical light spot is related to the distance between the focus F1 and the focus F2, and in general, the elliptical light spot gathered to the position of the light blocking sheet is closer to a circle when the focus F2 is closer to the focus F1; conversely, the farther the focus point F2 is from the focus point F1, the flatter the elliptical spot that converges to the position of the light-blocking sheet.
In one embodiment, the focal point F0, the focal point F1 and the focal point F2 are all located on a central axis of the free-form ellipsoidal mirror 1.
In an embodiment, an incident plane S1 and an exit curved surface S2 are respectively formed on two sides of the free-form surface projection lens 2, the incident plane S1 faces the free-form surface ellipsoidal reflector 1, the exit curved surface S2 faces away from the free-form surface ellipsoidal reflector 1, a focus of a vertically-cut curve S22 of the exit curved surface S2 is located at a focus F1, a focus corresponding to a central portion of a horizontally-cut curve S21 of the exit curved surface S2 is located at a focus F1, focuses corresponding to two side edge portions of a horizontally-cut curve S21 of the exit curved surface S2 are located at a focus F2, and the focuses corresponding to the two side edge portions from the central portion to the two side edge portions of the horizontally-cut curve S21 of the exit curved surface S2 are sequentially arranged between the focus F1 and the focus F2.
In the description of the present invention, it should be understood that the focus refers to a point where light rays are converged by reflection or refraction, for example, the "focus of the vertical cutting curve S22 of the curved exit surface S2" refers to a point where parallel light rays are converged by refraction at the position of the vertical cutting curve S22 through the curved exit surface S2, and since light rays are reversible, light rays emitted from the focus can also form parallel light rays by refraction at the position of the vertical cutting curve S22 through the curved exit surface S2, and those skilled in the art can understand the specific meaning of the above terms in the present invention in a specific situation.
The curved surface formed between the horizontal section curve S21 and the vertical section curve S22 of the curved exit surface S2 is in smooth transition.
The incident plane S1 is a plane, and the influence of the incident plane on the refraction of light is small, the adjustment of the light shape by the free-form surface projection lens 2 mainly passes through the exit curved surface S2, and the curvatures of the exit curved surface S2 at different positions are controlled to control the focal point F1 and the light emitted at the focal point F2 to form parallel light to be emitted, so that only the positions of each point of the exit curved surface S2 need to be calculated when the free-form surface projection lens 2 is designed, and the design difficulty is reduced.
In some embodiments, the vertically cut curve S22 is a spherical curve or an aspheric curve.
In a more preferred embodiment, as shown in fig. 6, the vertical cut curve S22 is an aspheric curve with a better curvature radius, so as to maintain a good aberration correction to obtain the required light shape adjustment performance, and the vertical cut plane of the exit curved surface S2 is taken as a ZY-axis coordinate system, and the point (Z) on the vertical cut curve S22 of the exit curved surface is taken as a Z-axis coordinate systemi，Yi) The following formula is satisfied:
Figure GDA0003492838640000061
where c is the curvature, k is the conic constant, a1, a2, a3, a4 … are the high order term coefficients.
The above aspheric curve design formula is based on the design formula of the non-curved lens in the art, wherein k, a1, a2, a3 and a4 … can be obtained according to the focal point F1 and the position of the free-form projection lens 2, and are not described again.
As shown in fig. 4 and 5, in an embodiment, the horizontal section of the exit curved surface S2 is taken as a ZX axis coordinate system, and the point C on the horizontal section curve S21 of the exit curved surface S2 is taken as a point Ci(Xi，Zi) Is determined by:
taking a series of sampling light rays at equal intervals, equally dividing an area between the focus F1 and the focus F2 into N sections, equally dividing the caliber R of the lens into N sections, equally dividing F1 into the position of the focus F1, F2 into the position of the focus F2, fi into the ith focus position corresponding to the sampling light rays, Ri into the intersection point of the sampling light rays and an incidence plane S1, Ci into the intersection point of the sampling light rays and a horizontal sectioning curve S21, and the coordinate of the intersection point is (X) Xi，Zi)，
Figure GDA0003492838640000062
In order to obtain the incident angle of the sampled light at Ri, δ is the emergent angle of the sampled light at Ri, and the corresponding relationship is shown as the following formula:
Figure GDA0003492838640000071
can obtain the product
Figure GDA0003492838640000072
According to the snell's law of refraction, the refractive index of the lens material is n, and the corresponding relationship is shown by the following formula:
Figure GDA0003492838640000073
can obtain the product
Figure GDA0003492838640000074
The sampling light is refracted again when reaching the exit curved surface S2 and finally exits in parallel with the Z axis, omega is the incident angle of the sampling light at the position of the Ci point, theta is the reflection angle, delta is the included angle with the Z axis, and according to the refraction law of the position of the Ci point, the following relation formula is provided:
Figure GDA0003492838640000075
from the trigonometric relationship of equation (3), it can be derived:
n·sinω＝sin(ω+δ)
n·sinω＝sinω·cosδ+cosω·sinδ
n·tgω＝tgω·cosδ+sinδ
Figure GDA0003492838640000076
since the tangent to the horizontal cut curve S21 at point Ci also includes an angle θ with the X-axis, the above equations (1) to (4) are combined according to θ ═ ω + δ: while taking into account the tangent of the tangent
Figure GDA0003492838640000077
Let Ci-1 be the point just before Ci, whose coordinates are (X)i-1，Zi-1) Then:
Figure GDA0003492838640000078
joint formulae (1) to (5), and initial condition X0When equal to 0, Z0Each point (X) on the profile of the horizontally cut curve S21 is obtained (lens thickness)i，Zi) The coordinate values of (2).
Defined by the above formula, the focal point of each line segment on the horizontal cutting curve S21 can be made to fall between the focal point F1 and the focal point F2, so that the light rays emitted from the focal point F1 and the focal point F2 are emitted as parallel light through the horizontal cutting curve S21 of the free-form surface projection lens 2.
In one embodiment, the top of the baffle 5 is provided with a Z-shaped stop line.
Through Z shape backstop line is favorable to carrying out partial sheltering from thereby making the low beam type who forms produce Z shape light and shade cut-off line to the oval facula of focus F1 department, and for linear light and shade cut-off line, Z shape light and shade cut-off line has better near light effect, does benefit to the discernment place ahead object.
As shown in fig. 1, in an embodiment, the headlamp apparatus further includes a mounting platform 3, and the free-form surface ellipsoidal reflector 1, the light source 4, the baffle 5 and the free-form surface projection lens 2 are all disposed on the mounting platform 3.
The light source 4 is selected from an LED light source, the free-form surface ellipsoidal reflector 1 is arranged on the mounting platform 3 in a cover body shape, and the light source 4 is positioned between the free-form surface ellipsoidal reflector 1 and the mounting platform 3.
Another embodiment of the present invention provides a vehicle including the headlamp apparatus as described above.
The vehicle adopts the headlamp device, so that the irradiation distance of the vehicle headlamp can be effectively increased, and meanwhile, a semi-elliptical low beam type is formed in the front of the vehicle, so that the brightness of two sides of a road is improved, and the driving safety is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A headlamp device is characterized by comprising a free-form surface ellipsoidal reflector, a light source, a baffle and a free-form surface projection lens, wherein a focus F0, a focus F1 and a focus F2 are formed between the free-form surface ellipsoidal reflector and the free-form surface projection lens, the focus F1 is positioned between the focus F2 and the focus F0, the light source is positioned at the focus F0, the cutting curves of the reflecting surface of the free-form surface ellipsoidal reflector passing through the central axis are all elliptic curves, the near focuses of the cutting curves of the free-form surface ellipsoidal reflector passing through different directions of the central axis are positioned at the same focus F0, the far focus is gradually changed from the focus F1 to the focus F2, the far focus of the vertical cutting curve of the free-form surface ellipsoidal reflector is positioned at the focus F1, and the far focus of the horizontal curve of the free-form surface ellipsoidal reflector is positioned at the focus F2, the baffle is located at the focal point F1, the focal point of the vertical section of the free-form surface projection lens is a single focal point located at the focal point F1, and the focal point of the horizontal section of the free-form surface projection lens is gradually changed from the focal point F1 to the focal point F2.
2. The headlamp device according to claim 1, wherein the distance between the focal point F1 and the focal point F2 is 3-20 mm.
3. The headlamp apparatus as claimed in claim 1, wherein the focal point F0, the focal point F1 and the focal point F2 are all located on a central axis of the free-form ellipsoidal reflector.
4. The headlamp apparatus as claimed in claim 1, wherein an incident plane S1 and an exit curved surface S2 are formed at both sides of the free curved surface projection lens, respectively, the incident plane S1 faces the free curved surface ellipsoidal reflector, the exit curved surface S2 faces away from the free curved surface ellipsoidal reflector, a focal point of a vertically cut curve S22 of the exit curved surface S2 is located at a focal point F1, a focal point of a central portion of a horizontally cut curve S21 of the exit curved surface S2 is located at a focal point F1, focal points of both side edge portions of a horizontally cut curve S21 of the exit curved surface S2 are located at a focal point F2, and focal points of the horizontally cut curve S21 of the exit curved surface S2 from the central portion to the both side edge portions are sequentially arranged between the focal point F1 and the focal point F2.
5. The headlamp device according to claim 4, wherein the vertically cut curve S22 is a spherical curve or an aspherical curve.
6. The headlamp device as claimed in claim 4, wherein the vertical cut curve S22 is an aspheric curve, and a point (Z) on the vertical cut curve S22 of the exit curved surface is a ZY axis coordinate system with the vertical cut plane of the exit curved surface S2 as the ZY axis coordinate systemi，Yi) The following formula is satisfied:
Figure FDA0003492838630000021
where c is the curvature, k is the conic constant, a1, a2, a3, a4 … are the high order term coefficients.
7. The headlamp device as claimed in claim 4, wherein a point C on a horizontal section curve S21 of the exit curved surface S2 is a ZX axis coordinate system with a horizontal section plane of the exit curved surface S2 as a ZX axis coordinate systemi(Xi，Zi) Is determined by:
taking a series of sampling light rays at equal intervals, equally dividing an area between the focus F1 and the focus F2 into N sections, equally dividing the caliber R of the lens into N sections, equally dividing F1 into the position of the focus F1, F2 into the position of the focus F2, fi into the ith focus position corresponding to the sampling light rays, Ri into the intersection point of the sampling light rays and an incidence plane S1, Ci into the intersection point of the sampling light rays and a horizontal sectioning curve S21, and the coordinate of the intersection point is (X) Xi，Zi)，
Figure FDA0003492838630000022
In order to obtain the incident angle of the sampled light at Ri, δ is the emergent angle of the sampled light at Ri, and the corresponding relationship is shown as the following formula:
Figure FDA0003492838630000023
according to the snell's law of refraction, the refractive index of the lens material is n, and the corresponding relationship is shown by the following formula:
Figure FDA0003492838630000024
the sampling light is refracted again when reaching the exit curved surface S2 and finally exits in parallel with the Z axis, omega is the incident angle of the sampling light at the position of the Ci point, theta is the reflection angle, delta is the included angle with the Z axis, and according to the refraction law of the position of the Ci point, the following relation formula is provided:
Figure FDA0003492838630000025
from the trigonometric relationship of equation (3), it can be derived:
Figure FDA0003492838630000026
since the tangent to the horizontal cut curve S21 at point Ci also includes an angle θ with the X-axis, the above equations (1) to (4) are combined according to θ ═ ω + δ: while taking into account the tangent of the tangent
Figure FDA0003492838630000027
Let Ci-1 be the point just before Ci, whose coordinates are (X)i-1，Zi-1) Then:
Figure FDA0003492838630000028
joint formulae (1) to (5), and initial condition X0When equal to 0, Z0Each point (X) on the profile of the horizontally cut curve S21 is obtained (lens thickness)i，Zi) The coordinate values of (2).
8. The headlamp apparatus according to claim 1, wherein the top of the barrier is provided with a Z-shaped stopper line.
9. The headlamp apparatus as claimed in claim 1, wherein the headlamp apparatus further comprises a mounting platform, and the free-form surface ellipsoidal reflector, the light source, the baffle, and the free-form surface projection lens are disposed on the mounting platform.
10. A vehicle characterized by comprising the headlamp apparatus as claimed in any one of claims 1 to 9.
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