CN113701119B - Optical system and lamp for improving near light path illumination uniformity - Google Patents
Optical system and lamp for improving near light path illumination uniformity Download PDFInfo
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- CN113701119B CN113701119B CN202111027424.3A CN202111027424A CN113701119B CN 113701119 B CN113701119 B CN 113701119B CN 202111027424 A CN202111027424 A CN 202111027424A CN 113701119 B CN113701119 B CN 113701119B
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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
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
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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
- F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
- F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
- F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
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- 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
- F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
- F21W2102/10—Arrangement or contour of the emitted light
- F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
- F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
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- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention provides an optical system and a lamp for improving illumination uniformity of a near light path, wherein a near light cutoff baffle is positioned between a light emitting module and a lens; light emitted by the light emitting module is converged at a focus of the inner surface of the lens; a part of light passes through the low-beam cutoff baffle to reach the inner surface of the lens below the central line, and the light propagates to the outer surface of the lens in the lens and then is converged upwards to a focus of the outer surface of the lens; the other light reflected ray is blocked by the low beam cutoff baffle and reflected, and the ray reaches the lens inner surface on the central line to enter the lens, propagates to the lens outer surface and is converged downwards to the focus of the lens outer surface. According to the invention, the phase change of the low-beam cutoff baffle is increased by rotating the low-beam cutoff baffle along the focus, so that the incident angle of the reflected light is increased, the emergent light continuously approaches to the horizontal central line of the lens, more light can enter the lens, the light utilization rate is improved, and the irradiation distance is increased.
Description
Technical Field
The invention relates to the technical field of vehicle illumination, in particular to an optical system and a lamp for improving uniformity of near light path illumination, and particularly relates to a near light cutoff baffle system.
Background
The design of the dipped headlight generally concentrates energy in the area required by regulations, meets the brightness requirement firstly, irradiates the rest energy to a large angle, ensures the illumination width and the irradiation distance of the road surface, and improves the driving safety of a driver. Meanwhile, in order to avoid the influence of excessive and disordered light rays on the road surface on human eyes, clients have relevant requirements on the uniformity of the road surface illuminance, and the brightness needs to be gradually decreased from the center to the outside and is uniformly gradually changed. The reflective low beam and the projection low beam in the early stage have larger size, can utilize more optical surfaces and light-emitting surfaces, and simultaneously have enough heat sinks to reduce light attenuation, so that the optical performance requirement can be basically met. However, for the current popular trend of the shape of the elongated strip, the size of the headlight is smaller and smaller, the space reserved for the design of far and near light is reduced, the feasibility and the development trend of the scheme are lower and lower, and the space requirement cannot be met, so that the small-size module becomes a development direction and is widely applied.
However, in practical designs, the optical performance requirements are not reduced even though space is more and more limited. For small-sized modules, the available optical surface is compressed in a limited space. Meanwhile, on the premise that the heat radiation performance is not remarkably improved, the improvement of optical efficiency by using a high-brightness light source to increase optical input is very little, only the cost is rapidly increased, the requirement of the maximum brightness of the center is considered by the small-size module, and the large-angle irradiation distance and uniformity of the road surface are ensured to become the tripping stones of the current car lamp designer.
The patent document with publication number CN104390897B discloses an optical system for detecting the size and shape of tiny particles, which improves the uniformity of a laser beam, after the laser beam is subjected to optical fiber homogenization treatment, a parallel beam with good uniformity is formed, and is injected into a spherical cavity mirror along the main axis direction of the spherical cavity mirror through reasonable optical path layout, and is converged with a sample air flow at an object point of the spherical cavity mirror, the sample air flow is led in along the direction vertical to the main axis direction of the system, and a particle forward scattering optical signal is accepted by a photomultiplier tube and is used as a main signal for measuring the particle size. Scattered light other than forward is directed to an image point of the spherical cavity lens in a large spatial angle range, and a planar CCD is arranged on an objective lens image plane behind the image point and is mainly used for detecting shape information of granularity. However, the patent document still has the defect of poor light path illumination uniformity due to short road surface large-angle illumination distance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an optical system and a lamp for improving the uniformity of near-light path illumination.
The invention provides an optical system for improving the uniformity of near light path illumination, which comprises a light emitting module, a near light cutoff baffle and a lens group;
the lens group comprises a lens, the low-beam cutoff baffle is positioned between the light emitting module and the lens, the low-beam cutoff baffle rotates relative to a horizontal plane, and an included angle exists between the low-beam cutoff baffle and the horizontal plane;
the light emitting module is used for emitting light, and the low-beam cutoff baffle is used for reflecting the light emitted by the light emitting module;
The light emitted by the light emitting module is converged at a focus of the inner surface of the lens;
A part of light passes through the low-beam cutoff baffle to reach the inner surface of the lens below the central line, and the light propagates to the outer surface of the lens in the lens and then is converged upwards to a focus of the outer surface of the lens;
The other light reflection ray is blocked by the low beam cutoff baffle and reflected, the light reaches the inner surface of the lens on the central line and enters the lens, propagates to the outer surface of the lens, and is converged downwards to the focus of the outer surface of the lens.
Preferably, the angle of rotation of the near-light cutoff baffle by passing the central light through the lens is calculated as follows:
Defining the focal point of the inner surface of the lens as P 1, defining the focal point of the outer surface of the lens as P 2, defining the reflection point as O, defining the emergent ray as EO, and defining the normal line as ON;
Light rays of EO reflected by the horizontal low-beam cutoff are defined as OH 2,OH2 and light rays refracted twice by the lens are defined as H 2'T2;
light rays of EO reflected by the low-beam cutoff with an angle are defined as OH 1, light rays of an angle alpha and OH 1 refracted twice by the lens are defined as H 1'T1;
Defining a center light passing section A, simulating an angle difference value of the light reaching a 25m focus before and after the rotation angle alpha of the low beam cutoff baffle, and defining beta:
β＝∠T1P2T2＝∠H′2P2O-∠H′1P2O；
according to the angular magnification formula γ=s/S 'of the lens, S is the focal length of the inner surface of the lens, S' is the focal length of the outer surface of the lens, it follows that:
Because the rotation angle is small, the light reflection point O deviates from the focus P 1 by a negligible amount, and P 1 is equivalent to O approximately, and the calculation process is as follows:
Wherein +.H 2OH1 is the angle difference between the light before and after the rotation of the low beam stop plate by an angle alpha and the light before and after the rotation of the low beam stop plate by an angle alpha, and the angle difference between the light before and after the rotation of the low beam stop plate by an angle alpha and the light after the refraction of the lens is +.H' 2P2H′1, so as to calculate the correspondence between the angle difference between the light before and after the rotation of the low beam stop plate by an angle alpha and the difference after the refraction of the light by the lens;
According to the reflection law, the incident angle is equal to the reflection angle, +.EON= NOH 2, under the condition that the incident light is unchanged, when the reflection surface rotates alpha, the normal line also rotates alpha, the normal line after rotation is defined as ON ', the incident angle becomes +.EON', and is equal to +.EON+alpha, the reflection angle is defined as +.N 'OH 1, and is equal to +.EON';
reflection angle N' OH 1＝∠N′OH2+∠H2OH1;
∠N′OH1＝∠N′OH2+∠H2OH1＝∠NOH2-α+∠H2OH1；
Substituting the obtained +.N 'OH 1 = EON' to obtain:
∠NOH2-α+∠FH2OH1＝∠EON′＝∠EON+α
From +.eon= = NOH 2:
∠H2OH1＝2α；
The change of the reflection angle is twice the rotation angle of the reflection surface under the condition that the incident light is unchanged;
The corresponding relation is arranged:
∠H2OH1＝2α；
it is derived that the low beam cutoff needs to be rotated when the final light pattern differs by beta
Preferably, the large angle light passes through the lens, and the rotation angle of the low beam cutoff is calculated as follows:
Defining that the large-angle light passes through a section B, wherein the distance from the section B to the central section A is x, the half width of the lens is y, the thickness is w, and the focal length of the outer surface is S 1;
The focal length of an incident surface of the section B is S 1 +xw/2y;
The focal length of the emergent surface of the section B is 25000+xw/2y;
it is derived that the low beam cutoff needs to be rotated when the final light pattern differs by beta
Preferably, the low beam cutoff is rotated toward the incident light along the focal point of the inner surface of the lens.
Preferably, the front and back focal lengths and thickness of the lens are adjusted according to the structural size and modeling requirements.
Preferably, the light rays are converged to the focal point of the inner surface of the lens after passing through the light source or the light source system in the light emitting module, and the light source or the light source system for converging the light rays to the focal point of the inner surface of the lens is of a reflection type, a direct type or a projection type.
Preferably, the light source or the light source system for converging the light to the focal point of the inner surface of the lens is direct.
Preferably, the material of the low beam cutoff is a metal material with reflective properties, polycarbonate or polymethyl methacrylate.
Preferably, the material of the low beam cutoff is a metal material with light reflecting property.
The invention also provides a lamp, which comprises the optical system for improving the uniformity of near light path illumination.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the invention, the angle of the light entering the lens is increased by rotating the low-beam cutoff baffle along the focus, the emergent light continuously approaches to the horizontal center line, more light can enter the lens, the light utilization rate is improved, and meanwhile, the irradiation distance of the light reaching the road surface after being refracted by the lens is also increased;
2. the invention fully utilizes the energy in the lamp, improves the optical efficiency and precisely controls the trend of light rays;
3. The invention increases the irradiation distance of a large angle without adding additional optical input, improves the uniformity of the road surface of the large angle, and further improves the utilization efficiency of the optics.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of an optical system for improving near-light illumination uniformity according to the present invention;
FIG. 2 is a schematic diagram of thin lens angle magnification;
FIG. 3 is a schematic diagram of the law of light reflection;
FIG. 4 is a partial schematic diagram of an optical system for improving near-light illumination uniformity according to the present invention;
FIG. 5 is a schematic view of the 3D dimensions of a half-lens of the present invention;
FIG. 6 is a schematic side view of the side view of FIG. 5 of the present invention;
FIG. 7 is a graph of optical illumination versus aerial view gray scale before and after rotation of the low beam cutoff of the present invention;
FIG. 8 is a graph of contrast gray scale of optical illumination of a 10m screen before and after rotation of the low beam cutoff of the present invention;
fig. 9 is a schematic view of the road surface irradiation distance before and after rotation of the low beam cutoff of the present invention.
The figure shows:
Light-emitting module 1 horizontal low-beam cutoff 202
Lens group 3 of low beam cutoff baffle 2
Lens 301 with angled low beam cutoff 201
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1:
As shown in fig. 1 and 2, an optical system for improving uniformity of illumination of a near light path includes an light emitting module 1, a near light cutoff baffle 2, and a lens group 3, wherein the lens group 3 includes a lens 301, the near light cutoff baffle 2 is located between the light emitting module 1 and the lens 301, the near light cutoff baffle 2 rotates relative to a horizontal plane, an included angle exists between the near light cutoff baffle 2 and the horizontal plane, the light emitting module 1 is used for emitting light, the near light cutoff baffle 2 is used for reflecting the light emitted by the light emitting module 1, the light emitted by the light emitting module 1 is converged at a focal point of an inner surface of the lens 301, a part of the light reaches the inner surface of the lens 301 below a center line through the near light cutoff baffle 2, the light propagates to an outer surface of the lens 301 in the lens 301, then is converged at the focal point of the outer surface of the lens 301 upward, and another part of the light reflected light is blocked and reflected by the near light enters the inner surface of the lens 301 on the center line, propagates to the outer surface of the lens 301, and is converged at the focal point of the outer surface of the lens 301 downward.
The angle of rotation of the near-light cutoff 2 by passing the center light through the lens 301 is calculated as follows:
Defining the focal point of the inner surface of the lens 301 as P 1, defining the focal point of the outer surface of the lens 301 as P 2, defining the reflection point as O, defining the outgoing light as EO, defining the normal as ON, defining the light reflected by the horizontal low beam cutoff 202 as OH 2,OH2 after two refractions by the lens 301 as H 2'T2, defining the light reflected by the angled low beam cutoff 201 as OH 1, defining the light reflected by the lens 301 as H 1'T1 with angles α, OH 1, defining the angle difference between the central light passing through the cut-off plane a and simulating the light reaching the focal point of 25m before and after the rotation angle α of the low beam cutoff 2 as β:
β＝∠T1P2T2＝∠H′2P2O-∠H′1P2O；
According to the lens angle magnification formula γ=s/S ', S is the focal length of the inner surface of the lens 301, S' is the focal length of the outer surface of the lens 301, resulting in:
Because the rotation angle is small, the light reflection point O deviates from the focus P 1 by a negligible amount, and P 1 is equivalent to O approximately, and the calculation process is as follows:
Wherein +.H 2OH1 is the angle difference between the two light rays before and after the rotation of the low beam cutoff baffle 2 by an angle alpha and before passing through the lens 301, and the angle difference between the two light rays before and after the rotation of the low beam cutoff baffle 2 by the angle alpha and after passing through the lens 301 is +.H' 2P2H′1, so as to calculate the corresponding relation between the angle difference between the two light rays before and after the rotation of the low beam cutoff baffle 2 by the angle alpha and the difference after the refraction of the lens 301;
According to the reflection law, the incident angle is equal to the reflection angle, +.EON= NOH 2, under the condition that the incident light is unchanged, when the reflection surface rotates alpha, the normal line also rotates alpha, the normal line after rotation is defined as ON ', the incident angle becomes +.EON', and is equal to +.EON+alpha, the reflection angle is defined as +.N 'OH 1, and is equal to +.EON';
reflection angle N' OH 1＝∠N′OH2+∠H2OH1;
∠N′OH1＝∠N′OH2+∠H2OH1＝∠NOH2-α+∠H2OH1；
Substituting the obtained +.N 'OH 1 = EON' to obtain:
∠NOH2-α+∠FH2OH1＝∠EON′＝∠EON+α
From +.eon= = NOH 2:
∠H2OH1＝2α；
The change of the reflection angle is twice the rotation angle of the reflection surface under the condition that the incident light is unchanged;
The corresponding relation is arranged:
∠H2OH1＝2α；
it is derived that the low beam cutoff 2 needs to be rotated when the final light pattern differs by β
The angle of rotation of the low beam stop 2 by the large angle light passing through the lens 301 is calculated as follows:
Defining that the large-angle light passes through the section B, wherein the distance from the section B to the central section A is x, the half width of the lens is y, the thickness is w, the focal length of the outer surface is S 1, the focal length of the incident surface of the section B is S 1 +xw/2y, and the focal length of the emergent surface of the section B is 25000+xw/2y;
it is derived that the low beam cutoff 2 needs to be rotated when the final light pattern differs by β
The low-beam cutoff 2 is rotated toward the incident light along the focal point of the inner surface of the lens 301. The front and back focal lengths and thickness adjustment settings of the lens 301 are adjusted according to the structural size and modeling requirements. The light rays are focused on the inner surface of the lens 301 from the inside of the light emitting module 1 after passing through the light source or the light source system, the light source or the light source system for realizing the focusing of the light rays on the inner surface of the lens 301 is reflective, direct-projection or projection, and the light source or the light source system for realizing the focusing of the light rays on the inner surface of the lens 301 in this embodiment is direct-projection. The material of the low beam stop 2 is a metal material with light reflecting property, polycarbonate or polymethyl methacrylate, and the material of the low beam stop 2 in this embodiment is a metal material with light reflecting property.
The embodiment also provides a lamp, which comprises the optical system for improving the uniformity of near light path illumination.
Example 2:
The present embodiment will be understood by those skilled in the art as a more specific description of embodiment 1.
As shown in fig. 1 to 6, the present embodiment provides an optical system for improving the uniformity of illumination of a near optical path, which increases the illumination distance of a large angle while not increasing additional optical input, and improves the uniformity of a road surface of a large angle, thereby improving the utilization efficiency of optics.
The present embodiment provides an optical system for improving uniformity of illumination of a near light path, and in particular relates to a near light cutoff baffle system, which comprises at least one light emitting module 1, a near light cutoff baffle 2 and a lens group 3, wherein the light emitting module 1 is an optical system for emitting light converging to a focus, and the near light cutoff baffle 2 is a metal baffle structure with a reflective property and has a certain angle α with a horizontal plane.
Light is emitted from the light emitting module 1 and is converged at a focal point of an inner surface of the lens 301, a part of the light reaches the inner surface of the lens 301 below the center line through the low beam cutoff 2 placed at the focal point of the inner surface, propagates inside the lens 301 to an outer surface of the lens 301, and then is converged upward at the focal point of the outer surface of the lens 301 (this part is not focused so as not to be described in detail, and is not shown in detail), and another part of the light is blocked by the low beam cutoff 2 before the focal point and is reflected by an upper surface of the low beam cutoff 2 having a light reflecting property, and the light reaches the inner surface of the lens 301 on the center line and enters inside the lens 301, propagates to the outer surface of the lens 301, and is converged downward at the focal point of the outer surface of the lens 301.
Since the light reflected by the low beam stop 2 is mostly reflected to the boundary area far from the center of the lens 301, the longitudinal deflection angle of the outgoing light after passing through the lens 301 is large, resulting in a short irradiation distance on the road surface, which greatly affects the optical performance on the road surface, especially in a large angle direction, so the low beam stop 2 is not placed horizontally but has a certain angle α with the horizontal plane in the design of this embodiment, which solves and optimizes the above-mentioned problem. The rotation angle calculation method of the low beam cutoff 2 is as follows:
1. the calculation method of the central ray passing through the lens (section A) comprises the following steps:
a: by simulating the angle difference of the front and rear light rays reaching a 25m (vehicle lamp regulation design requirement) focus by the rotation angle alpha of the low beam cutoff baffle plate 2, the angle difference is defined as beta;
The derivation formula is as follows:
β＝∠T1P2T2
＝∠H′2P2O2-∠H′1P2O2；
According to the lens angle magnification formula γ=s/S ', S is the focal length of the inner surface of the lens 301, S' is the focal length of the outer surface of the lens 301, resulting in:
Since the rotation angle is small, the deviation of the light reflection point O from the focal point P 1 is negligible, i.e., P 1 is equivalent to O, so the calculation process is as follows:
wherein +.H 2OH1 is the difference between the angles of the light before and after the angle alpha of rotation of the near light cutoff 2 (or the angle of rotation of the light on the front surface of the lens);
The difference between the angles of the light rays before and after the rotation of the low beam cutoff 2 by an angle alpha is +.H' 2P2H′1.
This allows calculation of the correspondence between the difference in angle between the light rays before passing through the lens 301 and the difference in angle between the light rays after being refracted by the lens 301 before and after rotating the low beam cutoff 2 by the angle α.
And c, according to the law of reflection, the incident angle is equal to the reflection angle, and the incident angle EON= NOF 2, when the reflection surface rotates alpha and the normal line rotates alpha under the condition that the incident light is unchanged, the incident angle becomes the angle EON' which is equal to the angle EON+alpha. The reflection angle is +.N 'OF 1 and is equal to +.EON';
at the same time, the reflection angle is N' OF 1＝∠N′OF2+∠F2OF1;
So +.N' OF 1＝∠N′OF2+∠F2OF1＝∠NOF2-α+∠F2OF1;
substituting the obtained +.N 'OF 1 = EON' to obtain:
∠NOF2-α+∠F2OF1＝∠EON′＝∠EON+α；
From +.eon= = NOF 2, we get: namely, the angle F 2OF1 =2α, it can be obtained that the change of the reflection angle is twice the rotation angle of the reflection surface under the condition that the incident light is unchanged;
substituting the principle application of the angle change relation between the incident light and the reflected light deduced in the step c into the light path ray analysis of the actual optical system of the patent, and finishing the corresponding relation to obtain the following steps:
∠H2OH1＝∠F2OF1＝2α；
Then substituting the corresponding relation between the angle difference before the light rays pass through the lens 301 and the difference after the light rays are refracted through the lens 301 in the two cases before and after the light ray cutoff baffle 2 rotates by an angle alpha in the b:
it can be derived that the low beam cutoff 2 needs to be rotated when the final light pattern differs by β
2. The calculation method of the large-angle light passing through the lens (the section B) can be calculated by the same method:
Defining that the large-angle light passes through a section B, wherein the distance from the section B to the central section A is x, the half width of the lens is y, the thickness is w, and the front surface focal length is S 1;
The focal length of an incident surface of the section B is S 1 +xw/2y;
The focal length of the emergent surface of the section B is 25000+xw/2y;
it can be derived that the low beam cutoff 2 needs to be rotated when the final light pattern differs by β
For 25000mm focal length requirements, the increase in back surface focal length is negligible, so when rotated by an angle alpha,Therefore, when the angle of the incident light is larger from the transverse center of the lens, the same alpha angle is rotated, the variation of beta is larger and larger, and the irradiation distance of the road surface is also larger, so that the irradiation distance of the light with a large angle and the uniformity of the road surface are ensured.
When the low beam stop 2 is rotated toward the incident light along the focal point, the reflected light is continuously deflected toward the horizontal center line, and the larger α, the closer the reflected light is to the lens center, i.e., the more toward the horizontal center line, the farther the road surface irradiation distance of the outgoing light is, regardless of the section a of the center section or the section B of the large angle section.
The front and back focal lengths and thickness of the lens 301 are adjustable, depending on the size and shape requirements. The incident light rays passing through the focal point of the front surface of the lens are refracted by the lens, and the emergent light rays are closer to the focal point of the outer surface of the lens.
The light rays are converged to the focal point of the inner surface of the lens after passing through the light source and a series of optical systems in the light emitting module 1, and the light source or the light source system for converging the light rays to the focal point of the inner surface of the lens can be of a reflection type, a direct type or a projection type.
The central ray passing through facet a is represented in fig. 7 as an optical illumination of the longitudinal axis 0, and both greater and lesser than 0 are non-central rays, wherein the greater the absolute value of the angular coordinate of the longitudinal axis is represented in fig. 7 by the large angle ray passing through facet B.
The material of the low beam cutoff 2 may be a metal material with light reflecting properties or polycarbonate (i.e., PC) or polymethyl methacrylate (i.e., PMMA).
Example 3:
The present embodiment will be understood by those skilled in the art as a more specific description of embodiment 1.
As shown in fig. 1, in the optical system provided in this embodiment, before the light emitted by the light emitting module 1 is converged at the focal point P 1 on the front surface of the lens 301, the light is reflected by the low beam stop 2 and is refracted for the first time on the front surface of the lens 301, then the light continues to propagate inside the lens 301 to reach the outer surface of the lens 301, after the second refraction, the light is converged at the focal point P 2 on the outer surface of the lens 301, and is continuously propagated and irradiated on the ground.
When the light rays are refracted by the lens 301, the light rays conform to the optical imaging principle of a thin lens, as shown in fig. 2, the light rays passing through the focal point P 1 of the front surface of the lens are converged at the focal point P 2 of the outer surface of the lens after being refracted by the lens 301, so that the light rays closer to the horizontal center line of the lens are smaller in two times of deflection angles when passing through the lens 301, and the light rays farther from the horizontal center line of the lens are larger in deflection angle.
As shown in fig. 1, EO is outgoing light, OH 2 is light that EO is reflected by the horizontal low-beam cutoff plate 202, OH 1 is light that is reflected by the angled low-beam cutoff plate 201, and after two refractions by the lens 301, the two light beams converge at the outer surface focal point P 2, and since OH 1 is closer to the horizontal center line, when the light beams are refracted by the outer surface of the lens 301 for the second time, the refracted light beam H 1'T1 is deflected by an angle smaller than H 2'T2, so that the distance to be irradiated on the road surface is longer.
As shown in the light reflection law schematic diagram of fig. 3, when the same incident light passes through different reflecting surfaces, the reflected light changes along with the change of the reflecting surfaces. The light EO is reflected by the horizontal reflection surface Plane2, the reflected light is OF 2, and when Plane2 is rotated clockwise by an angle α, the normal N is also rotated by an angle α to become N', and the reflected light is OF 1, but the rotation angle is 2α. So when the low beam cutoff 2 is rotated, the reflected light is rotated by a double angle, the double angle change brings the light closer to the horizontal center line, and the final imaging height is also closer to the horizontal center line. Meanwhile, as shown in fig. 4, the light OF 2 passing through the horizontal low-beam cutoff 202 is reflected outside the lens, and the same incident light EO is reflected by the angled low-beam cutoff 201, and the light OF 1 is in the surface OF the lens, so that more light is converged into the lens, thereby reducing the waste OF light and improving the optical efficiency.
Fig. 5 and 6 are schematic diagrams of the principle that a large-angle light ray passes through a non-central tangential plane of a lens, and when an incident light ray has a certain angle, the incident light ray does not completely pass through the central tangential plane a of the lens, but is distributed in each tangential plane of the lens to enter the lens for propagation, such as a tangential plane B in the drawing, and the angle of the incident light ray is arctan (x/S 1). And, at this time, the front and rear focal lengths of the lens are also changed, the front surface focal length is S 1 +xw/2y, the rear surface focal length is 25000+xw/2y, and for 25000mm focal length requirement, the rear variation increase is negligible, so when rotating alpha angle,
Fig. 7 is a graph of optical illuminance versus aerial view gray scale before and after rotation of the low beam cutoff 2 of the present embodiment, the abscissa is the road surface length, the abscissa 0 is the lamp position, the ordinate is the road surface width, and the ordinate 0 is the vehicle traveling direction central axis. After passing through the optical system with the angled low beam cutoff 201, the light distribution is greatly improved and the uniformity is also improved, especially in the large angle areas outside the large angles on both sides. The design performs road illumination analysis under the state that the height of the car lamp from the ground is 650mm, the thickness of the designed lens is w=20mm, the half width y of the lens is 35mm, the focal length S 1 of the front surface is 50mm, and the rotation angle alpha of the baffle is 3 degrees;
By the formula The change angle beta of the light after passing through the center section A of the lens is calculated to be about 0.012 DEG, and the specific calculation process is/>
As can be seen from fig. 7, the irradiation distance increases by approximately 5.3m when the ordinate of the 0.4lx line is 0m, the irradiation distance increases by approximately 13.5m at the left side 10m of the vehicle, and the irradiation distance increases by 14.5m at the right side 10 m. The illumination distance of the left side 20m of the vehicle increases by approximately 18.5m, and the illumination distance of the right side 20m increases by approximately 19m. Since the angle of the light ray deviated from the center of the lens cannot be accurately calculated and has the influence of stray light, as shown in fig. 9, the outgoing light ray can be approximately seen to be emitted from the same position in the lamp relative to the road surface irradiation distance by the irradiation distance change of 0m line (section a), that is, H 1',H2' is the same point, points T 2 and T 1 are the intersection points of the light ray before and after the rotation of the low beam cutoff baffle 2 and the ground, DT 1 is 129.8m, DT 2 is 124.5m, dh is the lamp ground-off height ＝650mm,∠CHT1＝arctan(DH/DT1),∠CHT2＝arctan(DH/DT2),β＝∠CHT2-∠CHT1, so that β= 0.2991-0.2869 =0.0122°, approximately 0.012°, and the verification result is consistent with the formula of this patent.
As shown in the 10m screen energy gray scale map of fig. 8, the falling light pattern is lifted in position height after passing through the angled low beam cutoff baffle 201, and the increased energy also greatly improves the position height at a large angle, so that the light pattern is basically consistent with the center light pattern and is matched with the bird's eye view.
According to the invention, by rotating the low-beam cutoff baffle 2 along the focus, the angle of the light entering the lens 301 is increased, the emergent light continuously approaches to the horizontal center line, more light can enter the lens 301, the light utilization rate is improved, and meanwhile, the irradiation distance of the light reaching the road surface after being refracted by the lens 301 is also increased.
In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.
Claims (7)
1. An optical system for improving the uniformity of near light path illumination is characterized by comprising a light emitting module (1), a near light cutoff baffle (2) and a lens group (3);
The lens group (3) comprises a lens (301), the low-beam cutoff baffle (2) is positioned between the light emitting module (1) and the lens (301), the low-beam cutoff baffle (2) rotates relative to the horizontal plane, and an included angle exists between the low-beam cutoff baffle (2) and the horizontal plane;
The light emitting module (1) is used for emitting light, and the low-beam cutoff baffle (2) is used for reflecting the light emitted by the light emitting module (1);
the light emitted by the light emitting module (1) is converged at a focus point on the inner surface of the lens (301);
A part of the light passes through the low beam cutoff (2) to reach the inner surface of the lens (301) below the central line, and the light propagates to the outer surface of the lens (301) inside the lens (301) and then is converged upwards to a focus point of the outer surface of the lens (301);
The other light is blocked by the low beam cutoff baffle (2) and reflected, reaches the inner surface of the lens (301) on the central line, enters the lens (301), propagates to the outer surface of the lens (301), and then is converged downwards to the focus of the outer surface of the lens (301);
the center light passes through the lens (301), and the rotation angle of the low beam cutoff (2) is calculated as follows:
Defining a focal point of the inner surface of the lens (301) as P 1, defining a focal point of the outer surface of the lens (301) as P 2, defining a reflection point of the low-beam cutoff (2) as O, defining an outgoing light ray of the low-beam cutoff (2) as EO, and defining a normal line of the low-beam cutoff (2) as ON;
Light rays of EO reflected by the horizontal low-beam cutoff (202) are defined as OH 2,OH2 and light rays after two refractions by the lens (301) are defined as H 2'T2;
Light rays of EO reflected by the low beam cutoff baffle (201) with angles are defined as OH 1, light rays of which angles are alpha and OH 1 after being refracted twice by the lens (301) are defined as H 1'T1;
Defining a section A of the central light passing through the lens (301), simulating an angle difference value of the light reaching a 25m focus before and after the rotation angle alpha of the low beam cutoff baffle (2) and defining beta:
β＝∠T1P2T2＝∠H′2P2O-∠H′1P2O；
according to the lens angular magnification formula γ=s/S ', S is the focal length of the inner surface of the lens (301), S' is the focal length of the outer surface of the lens (301), giving:
Because the rotation angle is small, the light reflection point O deviates from the focus P 1 by a negligible amount, and P 1 is equivalent to O approximately, and the calculation process is as follows:
Wherein +.H 2OH1 is the angle difference between the light rays before and after the passing light cutoff baffle (2) rotates by an angle alpha and before passing through the lens (301), the angle difference between the light rays before and after the passing light cutoff baffle (2) rotates by an angle alpha and after passing through the lens (301) is +.H' 2P2H′1, thereby calculating the correspondence between the angle difference between the light rays before and after the passing light cutoff baffle (2) rotates by an angle alpha and the difference after passing through the lens (301);
According to the reflection law, the incident angle is equal to the reflection angle, +.EON= NOH 2, under the condition that the incident light is unchanged, when the reflection surface rotates alpha, the normal line also rotates alpha, the normal line after rotation is defined as ON ', the incident angle becomes +.EON', and is equal to +.EON+alpha, the reflection angle is defined as +.N 'OH 1, and is equal to +.EON';
reflection angle N' OH 1＝∠N′OH2+∠H2OH1;
∠N′OH1＝∠N′OH2+∠H2OH1＝∠NOH2-α+∠H2OH1；
Substituting the obtained +.N 'OH 1 = EON' to obtain:
∠NOH2-α+∠H2OH1＝∠EON′＝∠EON+α
From +.eon= = NOH 2:
∠H2OH1＝2α；
The change of the reflection angle is twice the rotation angle of the reflection surface under the condition that the incident light is unchanged;
The corresponding relation is arranged:
∠H2OH1＝2α；
it is derived that the low beam cutoff (2) needs to be rotated when the final light pattern differs by beta
The large-angle light passes through the lens (301), and the rotation angle of the low-beam cutoff (2) is calculated as follows:
Defining a section B of the large-angle light passing through the lens (301), wherein the distance from the section B to the central section A is x, the half width of the lens is y, the thickness is w, and the focal length of the outer surface is S';
the focal length of the incident surface of the section B is S' +xw/2y;
The focal length of the emergent surface of the section B is 25000+xw/2y;
it is derived that the low beam cutoff (2) needs to be rotated when the final light pattern differs by beta
The low beam cutoff (2) is rotated toward the incident light along the focal point of the inner surface of the lens (301).
2. The optical system for improving near optical illumination uniformity according to claim 1, characterized in that the front and rear focal length and thickness adjustment settings of the lens (301) are adjusted according to the structural size and modeling requirements.
3. The optical system for improving the uniformity of near-light illumination according to claim 1, wherein the light rays are converged to the focal point of the inner surface of the lens (301) after passing through the light source system in the light emitting module (1), and the light source system for converging the light rays to the focal point of the inner surface of the lens (301) is reflective and direct.
4. An optical system for improving the uniformity of near light illumination according to claim 3, characterized in that the light source system for achieving focusing of light rays onto the focal point of the inner surface of said lens (301) is a direct type.
5. Optical system for improving the homogeneity of the illumination of a near light according to claim 1, characterized in that the material of the near light cutoff (2) is a metal material with reflective properties, polycarbonate or polymethyl methacrylate.
6. The optical system for improving the uniformity of near-light illumination according to claim 5, characterized in that the material of the near-light cutoff (2) is a metal material with reflective properties.
7. A luminaire comprising the optical system for improving near light illumination uniformity of any one of claims 1 to 6.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101776238A (en) * | 2009-01-13 | 2010-07-14 | 市光工业株式会社 | Vehicle lighting device |
| JP2015222702A (en) * | 2014-05-23 | 2015-12-10 | スタンレー電気株式会社 | Lens body and vehicle lamp |
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| JP6864633B2 (en) * | 2015-12-15 | 2021-04-28 | 株式会社小糸製作所 | Vehicle lighting fixtures and boards |
| CN108692270B (en) * | 2017-02-20 | 2020-05-12 | 诚益光电科技股份有限公司 | car light unit |
| JP6564497B2 (en) * | 2018-05-25 | 2019-08-21 | スタンレー電気株式会社 | Lens assembly and vehicle lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101776238A (en) * | 2009-01-13 | 2010-07-14 | 市光工业株式会社 | Vehicle lighting device |
| JP2015222702A (en) * | 2014-05-23 | 2015-12-10 | スタンレー電気株式会社 | Lens body and vehicle lamp |
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