CN109724047B - Dipped beam module for automobile headlamp and automobile headlamp - Google Patents
Dipped beam module for automobile headlamp and automobile headlamp Download PDFInfo
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- CN109724047B CN109724047B CN201910135616.2A CN201910135616A CN109724047B CN 109724047 B CN109724047 B CN 109724047B CN 201910135616 A CN201910135616 A CN 201910135616A CN 109724047 B CN109724047 B CN 109724047B
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Abstract
The invention discloses a low beam module for an automobile headlamp and the automobile headlamp, belongs to the technical field of automobile lamps, and aims to solve the problem that a third area of the low beam headlamp in the prior art needs certain illumination but cannot be too high. The invention comprises a bracket, wherein a reflector, a light source, a stop line baffle and a lens are sequentially arranged on the bracket, the reflector is an elliptical sphere, the light source and the stop line baffle are sequentially arranged at a first focus and a second focus of the reflector, the edge of the reflector is provided with a reflector inclined plane with a horizontal downward inclination angle alpha, the stop line baffle comprises a bracket inclined plane with a horizontal downward inclination angle beta, and an included angle between light rays emitted by the light source at one side of the stop line baffle and a normal isThe included angle between the light and the horizontal direction after passing through the lens isSatisfies the following conditionsWherein，. The invention is suitable for the automobile headlamp.
Description
Technical Field
The invention belongs to the technical field of automobile lamps, and particularly relates to a low beam module for an automobile headlamp and the automobile headlamp.
Background
At present, more and more dipped headlight lamps use LEDs as light sources, so that the energy is saved, the environment is protected, the service life is prolonged, and the light distribution performance is better. The near-light headlight does not need a spot light for the third area above the cut-off line, and the main function of the third area is to illuminate the traffic sign in front of the traffic sign, so that the third area needs to meet certain illumination requirements at specific points and cannot be too high. This area is not well complemented because the cut-off line is required to be relatively sharp, the upper light is blocked by the baffle, the illuminance of the three areas needs to be complemented, and the light of the other areas needs to be utilized.
On the other hand, according to the national standard of automotive LED headlamps, GB 25991-2010, the light distribution requirements for three regions are divided into a region a and a region B, as shown in fig. 1, 2 and table 1, and the illuminance restrictions of test points 1-8 on the light distribution screen for the LED headlamps are required to meet the following regulations: test pointThe method comprises the steps of carrying out a first treatment on the surface of the Test point；/>；/>The method comprises the steps of carrying out a first treatment on the surface of the However, if the control is not good or the lens is assembled with a certain displacement, the light in the three areas is extremely easy to exceed the standard, the light shape is affected, the light spot may lack one piece, and the whole is not uniform. Some light only reaches the three areas through a part of light reflected by the support flat plate, but the part of light is reflected by the root of the reflector, the reflection angle is smaller, and the baffle plane has no controllable parameters, so after passing through the lens, the light can not reach the three areas accurately, and even if the light reaches the three areas, the distribution of illumination of each point can not be completely met;and the bracket flat plate is generally made of black plastic or a die-casting device, the reflection attribute of the bracket flat plate is not well known, and the success rate is not high.
Aiming at the defects, the application provides a light reflecting bowl, a bracket and a lens which are matched together to solve the problem that the illuminance of three areas is difficult to be well supplemented.
Disclosure of Invention
The invention aims at: the low beam module for the automobile headlamp and the automobile headlamp are provided for solving the problem that a third area of the low beam headlamp in the prior art needs certain illumination but cannot be too high.
The technical scheme adopted by the invention is as follows:
a low beam module for automotive headlamp, includes the support, has set gradually reflector, light source, stop line baffle and lens on the support, and the reflector is oval sphere, and light source and stop line baffle set gradually in the first focus department and the second focus department of reflector, and the edge of reflector is equipped with the decurrent reflector inclined plane of level, and stop line baffle includes the second focus department of reflector to the support inclined plane of lens direction horizontal downward extension.
Wherein, the included angle between the inclined plane of the reflecting bowl and the horizontal direction is alpha, the included angle between the inclined plane of the bracket and the horizontal direction is beta, and the included angle between the light emitted by the light source at one side of the stop line baffle and the normal is theta 1 The included angle between the light and the horizontal direction after passing through the lens isSatisfies the following conditions
；
Wherein,，/>。
preferably, the bottom of the lens is also provided with a free-form surface.
Preferably, the free-form surface is further provided with a hole for preventing the index of the B50L point from being higher after the light enters the three areas.
Wherein, an included angle exists between the junction of the elliptical cambered surface of the upper half part of the reflecting bowl and the inclined surface of the reflecting bowl and the light source in the horizontal direction，/>The method comprises the steps of carrying out a first treatment on the surface of the An included angle exists between the free end of the inclined surface of the reflecting bowl and the light source in the horizontal direction，/>。
As a preferred alternative to this,45 DEG>30 deg..
An automotive headlamp comprising a low beam module as described above.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
according to the invention, the reflecting bowl inclined plane and the bracket inclined plane with the inclination angle matched with the inclination angle of the reflecting bowl inclined plane are arranged at the edge of the reflecting bowl, so that the light emitted by the LED light source is more fully utilized, and the light reflected by the bracket inclined plane can well complement the illuminance of three areas, so that the required illuminance requirement can be more conveniently met; in addition, the illuminance difference requirement of the area A and the area B in the three areas can be further met by setting the free curved surface; meanwhile, in order to avoid exceeding of indexes of the B50L point positions in the three regions, holes are dug at positions corresponding to the free curved surfaces, so that part of light cannot irradiate the B50L point positions of the three regions, and therefore illuminance of the B50L point positions is better controlled.
Drawings
FIG. 1 is a schematic view of a headlamp light distribution screen in accordance with the present invention;
FIG. 2 is a schematic diagram of the distribution of the positions of test points of a headlamp light distribution screen according to the invention;
FIG. 3 is a schematic view of the low beam module according to the present invention;
FIG. 4 is a schematic view of the light source exit range according to the present invention;
FIG. 5 is a schematic illustration of the various angles of the light propagation path according to the present invention;
FIG. 6 is a schematic diagram showing the comparison of light rays passing through a free-form surface according to the present invention;
FIG. 7 is a partially omitted schematic illustration of the overall optical path in the present invention;
FIG. 8 is a schematic view of a lens structure according to the present invention;
FIG. 9 is a cross-sectional view of lens H-H of the present invention;
FIG. 10 is an enlarged view of the free-form surface of the lens according to the present invention;
table 1 is a light distribution requirement data table of the headlight low beam;
the marks in the figure: 1-reflecting bowl, 11-elliptic cambered surface, 12-reflecting bowl inclined plane, 2-light source, 3-stop line baffle, 4-support and 5-lens.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 3, a low beam module for an automotive headlamp comprises a bracket 4, wherein a reflector 1, a light source 2, a stop line baffle 3 and a lens 5 are sequentially arranged on the bracket 4, the reflector 1 is an elliptical sphere, the light source 2 and the stop line baffle 3 are sequentially arranged at a first focus and a second focus of the reflector 1, the edge of the reflector 1 is provided with a reflector inclined plane with a horizontal downward inclination angle alpha, the stop line baffle 3 comprises a shielding plate horizontally arranged and a bracket inclined plane with a horizontal downward inclination angle beta, the bracket inclined plane can reflect light,the shielding plate does not reflect light, and the junction of the shielding plate and the inclined surface of the bracket can just reflect light; the included angle between the light emitted by the light source 2 at one side of the stop line baffle 3 and the normal line is theta 1 The included angle between the light and the horizontal direction after passing through the lens 5 isIt satisfies the following conditions:
；
wherein,，/>。
the specific setting principle is as follows: according to the light distribution requirement of the headlight passing through the three zones, on one hand, the illuminance value of any point in the three zones needs to be less than or equal to 0.7lx, on the other hand, the test point 1+2+3 needs to be more than or equal to 0.3lx, the test point 4+5+6 needs to be more than or equal to 0.6lx, and the test point 7 and the test point 8 also need to be different; the three zones are generally divided into a zone A and a zone B, so that the illumination requirements of the zone A and the zone B are different, and the illumination requirements of the zone B are higher than those of the zone A.
Suppose a point of three areas on a 25 meter screenFrom the trigonometric function relationship, it can be derived: the angle of the light ray corresponding to the H direction reaching the three areas on the 25 m screen is +.>The angle of the light corresponding to the V direction reaching the three areas on the 25 m screen is +.>According to the three-area range specified by the national standard, the light angle range corresponding to the three areas on the screen which can reach 25 meters can be calculated by bringing the boundary value into the range:
region a, V direction:and (3) the H direction: />°；
Zone B, V direction:and (3) the H direction: />。
As shown in FIG. 5, the included angle between the outgoing light of the erection light source and the vertical direction of the light source is theta 1 The incident angle of the light passing through the inclined plane of the reflecting bowl is theta 2 An emergence angle of theta 3 The included angle between the normal line of the inclined plane of the reflecting bowl and the vertical direction is alpha, and the included angle between the incident light and the vertical direction is theta when the light passes through the inclined plane of the bracket 4 The included angle between the normal line of the bracket inclined plane and the vertical direction is beta, and the emergence angle of the light on the bracket inclined plane is theta 5 The included angle between the light emitted by the lens and the horizontal direction is；
Theoretically according to the snell formula:the angle of the light ray passing through the lens light-in plane and the light-out cambered surface can be calculated, but because the angle of the light ray entering the three areas is smaller, the light ray enters the lens through the refraction of the lens plane, and when the light ray enters the air through the refraction, the central position of the lens light-out cambered surface can be approximately regarded as small in angle change, and according to the angle relation in fig. 5, the angle relation can be known:
；
；
；
；
；
the above relationships are combined to obtain that:
；
wherein,，/>。
since the LED light source has directivity, the light emitting angle is about 120 °, a part of the light in this range can be reflected off the second focal point under the reflector, but when the reflected light passes through the second focal point, the reflected light is difficult to reflect to the lens due to the smaller reflection angle, and thus cannot be utilized well, and the light occupies about 15 ° as shown in fig. 4, so it can be inferred thatTherefore, under the condition that alpha and beta meet the conditions, light irradiated on the inclined plane of the reflector at the light source can be reflected to the upper half part of the lens through the inclined plane of the bracket, and the light is just irradiated on the three areas on the 25-meter screen, so that the illumination of the three areas is well supplemented.
The bracket is generally black, the reflectivity of the bracket is low, the light energy of the part is relatively weak, the structure supplements the illumination of the whole three areas, and the illumination requirement of the B area in the three areas is higher than that of the A area, so that the illumination of the part cannot meet the illumination differentiation requirement of the A area and the B area. To solve this problem, a free-form surface is added to the bottom of the lens, as shown in fig. 5, 9 and 10. Therefore, the free-form surface is added at the bottom of the lens, so that the position of the three-area B area on the 25 m screen can be flexibly controlled after a part of light is refracted by the lens, and meanwhile, the free-form surface is positioned at the lower part of the lens, and the area of the free-form surface is limited, so that only a small part of light in the lower light beam is utilized, and the whole light shape is not influenced.
For the arrangement of the free curved surface, when the light source is arranged at the first focus of the reflector according to the characteristics of the reflector, the light rays are emitted from the second focus of the reflector, so that the light rays emitted from the second focus can be regarded as a point light source to emit; the second focus is taken as an origin to establish a coordinate system, light rays are refracted when passing through the first surface, and the vector form of the refraction law can be expressed as:
；
wherein n is the refractive index of the free-form surface medium,for incident ray unit vector, +.>For the unit vector of the emergent ray, ">Is the unit normal vector of the free plane at the light incident point; when calculating the first surface type, firstly determining a calculated initial point, setting the coordinates of a point B when light reaches a free curved surface as (x, z), refracting the light to a point C on a light emergent surface of a lens through the free curved surface on the lens plane, and projecting the light to a point D on a screen as (r, H), wherein +_>R is the point position of the light projected on the screen; thus, incident light AB and emergent lightThe unit vector of the CD can be obtained, and the normal vector of the point C can be obtained by utilizing the refraction law formula, so that the tangential plane of the point is determined, and the tangential plane intersects with the light which is incident on the free curved surface after being refracted by the first surface of the next point, so that the next point of the free curved surface is determined; the tangent plane of the previous point and the straight line of the normal vector of the next point are intersected to obtain the next point, and the coordinates of each point can be obtained through computer iteration, so that the coordinates of each point on the free curved surface are determined.
Specifically, as shown in the figure, when the incident angle O is the emergent angle of the incident light ray with no free curved surface after being refracted by the lens, the direction of the incident light ray with the angle U is downwards deflected, and the incident light ray is contributed to zone 1, zone 2 and zone 4. After the free curved surface is added, the angle of emergent light of the same angle U after the incident light is refracted by the lens is the angle Q, and the angle Y range between the emergent direction and the horizontal direction is consistent with the angle range of V direction reaching the three areas, namely. The free-form surface is characterized in that: the H direction is horizontal and has no undulation, and the V direction free curved surface is all the free curved surfaces which can lead the light emergent angle after the refraction of the lens to meet +.>Is defined by a set of points.
As shown in fig. 6, part of the light rays are reflected to the bracket inclined plane after passing through the reflector inclined plane 12, reflected to the lens 5 through the bracket inclined plane, and then projected to the position of the area a in the three areas to form the light rays at the position M in the diagram; and part of light passes through the bottom end of the lens and reaches the position of the region B of the three regions after being refracted by the free curved surface, so as to form light at the position N in the illustration.
According to the light distribution requirement of the headlight passing through the free-form surface in table 1, the index of the B50L point is higher when the light passing through the free-form surface reaches the three regions, in order to solve the problem, the free-form surface is also provided with a hole, the bottom of the hole is a plane, so that the light passing through the hole can not reach the three regions, and the problem that the index of the B50L point exceeds the requirement is avoided. The hole may be provided as follows.
B50LIs (1.5,0.25) corresponding to the light angle +.>Calculated as (3.4 degrees, 0.57 degrees), namely the horizontal emergent angle of the lens passing through the free curved surface is 3.4 degrees, and the vertical emergent angle is 0.57 degrees. When the free-form surface is not added, the light ray emergent angle at the lower part of the lens is downwards deflected in the vertical direction and contributes to the first area, the second area and the fourth area of the light spot, and after the free-form surface is added, the partial light ray is deflected to the vertical direction upwards and contributes to the third area; therefore, when the light reaching the point B50L needs to be removed, only the free-form surface area corresponding to the point B50L needs to be removed, and as shown in fig. 7, a plane area is a hole digging area on the free-form surface. The determination of this planar area is closely related to the location of B50L on a 25 meter screen. Because the image is amplified and opposite after passing through the projection lens, the point B50L on the 25 m screen is positioned at the left side of the light distribution screen, and the corresponding area A is positioned at the right side of the center line of the lens; the A area isAnd the distance X of the midpoint from the center line of the lens is in the range: />。
In order to make the light which is difficult to be well utilized within the range of 15 degrees of the LED light source be more fully utilized, as shown in fig. 4, an included angle exists between the intersection of the elliptical cambered surface 11 of the upper half part of the reflector 1 and the inclined surface 12 of the reflector and the light source in the horizontal direction，/>The method comprises the steps of carrying out a first treatment on the surface of the The free end of the inclined surface 12 of the reflector has an angle with the light source in the horizontal direction>，/>。
As a preferred alternative to this,45 DEG>The LED light source is 30 degrees, so that the light rays which are effective for 120 degrees of the LED light source are fully and effectively utilized.
An automotive headlamp comprising a low beam module as described above.
Example 1:
a low beam module for automotive headlamp, includes the support, has set gradually reflector, light source, stop line baffle and lens on the support, and the reflector is oval sphere, and light source and stop line baffle set gradually in the first focus department and the second focus department of reflector, and the edge of reflector is equipped with the decurrent reflector inclined plane of level, and stop line baffle includes the second focus department of reflector to the support inclined plane of lens direction horizontal downward extension.
Example 2:
on the basis of embodiment 1, the edge of the reflector is provided with a reflector inclined plane with a horizontal downward inclination angle alpha, the stop line baffle comprises a shielding plate which is horizontally arranged and a bracket inclined plane with a horizontal downward inclination angle beta, wherein the bracket inclined plane can reflect light rays, the shielding plate does not reflect light rays, and the joint of the shielding plate and the bracket inclined plane can just reflect light rays; the included angle between the light emitted by the light source at one side of the stop line baffle and the normal isThe angle between the light ray and the horizontal direction after passing through the lens is +.>It satisfies the following conditions:
；
wherein,，/>。
example 3:
on the basis of the embodiment, the bottom of the lens is also provided with a free-form surface, and the free-form surface is also provided with a hole for preventing the index of the B50L point from being higher after light enters the three areas.
Example 4:
on the basis of the embodiment, an included angle exists between the junction of the elliptical cambered surface of the upper half part of the reflector and the inclined surface of the reflector and the light source in the horizontal direction，/>The method comprises the steps of carrying out a first treatment on the surface of the An included angle is formed between the free end of the inclined surface of the reflecting bowl and the light source in the horizontal direction>，/>。
Example 5:
on the basis of the above embodiment, p is 45 ° and q is 30 °.
Example 6:
on the basis of the embodiment, the automobile headlamp comprises the low beam module.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The utility model provides a low beam module for automotive headlamp, includes support (4), has set gradually reflector (1), light source (2), stop line baffle (3) and lens (5) on support (4), its characterized in that: the light reflecting bowl (1) is an elliptical sphere, the light source (2) and the stop line baffle (3) are sequentially arranged at a first focus and a second focus of the light reflecting bowl (1), a horizontal downward light reflecting bowl inclined surface (12) is arranged at the edge of the light reflecting bowl (1), the stop line baffle (3) comprises a bracket inclined surface which horizontally extends downwards from the second focus of the light reflecting bowl (1) to the direction of the lens (5), a free-form surface (51) is further arranged at the bottom of the lens (5), and a hole digging (52) which prevents the index of a B50L point from being higher after light enters three areas is further arranged on the free-form surface (51);
the included angle Y between the emergent direction of the light passing through the free curved surface (51) and the horizontal direction meets the following condition；
The included angle between the inclined plane (12) of the reflecting bowl and the horizontal direction is alpha, the included angle between the inclined plane of the bracket and the horizontal direction is beta, and the included angle between the light emitted by the light source (2) at one side of the stop line baffle (3) and the normal is theta 1 The included angle between the light ray and the horizontal direction after passing through the lens (5) isSatisfies the following conditions
；
Wherein,，/>。
2. a kind of as claimed in claim 1A passing light module for automotive headlamp, its characterized in that: an included angle exists between the junction of the upper part elliptical cambered surface (11) of the reflecting bowl (1) and the reflecting bowl inclined surface (12) and the light source in the horizontal direction，The method comprises the steps of carrying out a first treatment on the surface of the An included angle +.A free end of the inclined surface (12) of the reflecting bowl has an included angle +.A light source is horizontally arranged between the free end of the inclined surface and the light source>，。
3. A low beam module for an automotive headlamp as set forth in claim 2, wherein:45 DEG>30 deg..
4. An automotive headlamp, characterized in that: a low beam module as claimed in any one of claims 1-3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910135616.2A CN109724047B (en) | 2019-02-22 | 2019-02-22 | Dipped beam module for automobile headlamp and automobile headlamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910135616.2A CN109724047B (en) | 2019-02-22 | 2019-02-22 | Dipped beam module for automobile headlamp and automobile headlamp |
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| CN109724047A CN109724047A (en) | 2019-05-07 |
| CN109724047B true CN109724047B (en) | 2024-04-16 |
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| CN110107857B (en) | 2019-06-04 | 2024-04-12 | 华域视觉科技(上海)有限公司 | Near light III district lighting module, vehicle head-light and vehicle |
| WO2021036218A1 (en) * | 2019-08-23 | 2021-03-04 | 华域视觉科技(上海)有限公司 | Micro vehicle lamp module and reflecting structure |
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| CN104180269A (en) * | 2014-09-05 | 2014-12-03 | 广州市雷腾照明科技有限公司 | Automobile headlamp optical system |
| JP2017208196A (en) * | 2016-05-17 | 2017-11-24 | スタンレー電気株式会社 | Vehicular lighting fixture |
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| CN209558252U (en) * | 2019-02-22 | 2019-10-29 | 成都瀚德胜邦光学有限公司 | A kind of dipped beam mould group and car headlamp for car headlamp |
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2019
- 2019-02-22 CN CN201910135616.2A patent/CN109724047B/en active Active
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|---|---|---|---|---|
| EP1500869A1 (en) * | 2003-07-24 | 2005-01-26 | Valeo Vision | Elliptical lighting module without screen emitting a low beam and headlamp comprising the same |
| CN104180269A (en) * | 2014-09-05 | 2014-12-03 | 广州市雷腾照明科技有限公司 | Automobile headlamp optical system |
| JP2017208196A (en) * | 2016-05-17 | 2017-11-24 | スタンレー電気株式会社 | Vehicular lighting fixture |
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Address after: No.159, Tengfei 2nd Road, Southwest Airport Economic Development Zone, Shuangliu District, Chengdu Applicant after: CHENGDU HAN DE SHENG BANG OPTICAL Co.,Ltd. Address before: 610200 Southwest Airport Economic Development Zone, Shuangliu District, Chengdu City, Sichuan Province, No. 159 Tengfei No. 2 Road Applicant before: CHENGDU HAN DE SHENG BANG OPTICAL Co.,Ltd. |
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