CN101298906B - Automobile front shining lamp based on double-convex lens - Google Patents

Abstract

The invention provides a car head light based on the biconvex lens, characterized in that the main light source is the discharge lamp or the halogen lamp, and the car head light is composed of a free-form surface reflector, a light screen, a biconvex lens, a lens holder and the like. The car head light based on the biconvex lens of the invention adopts the free-form surface reflector, to make thelight source emergence flock. The focus of the biconvex lens is set near the dead line of the light screen to make the dead line distinct. The biconvex lens design can avoid the damage of the car lighting circle, the matched mirror or the other parts on the car caused by the light focus of the sunshine. The invention reduces the risk of the light design, advances the safety, the stability and theservice life, has strong universality, which is suitable for a plurality of models of cars.

Description

Car headlamp based on biconvex lens

Technical field

The present invention relates to a kind of car headlamp, more specifically, the present invention relates to a kind of car headlamp based on biconvex lens.Described car headlamp comprises dipped beam, distance light, front fog lamp, described car headlamp adopts the biconvex lens design, by this, can effectively avoid sunshine to burn other parts on car light or the automobile through focusing on after the reflection from lens, thus, the safety in utilization and the service life of car light have been improved greatly.

Background technology

The development of car headlamp is through the first generation---acetylene gas headlamp free form surface till now, and the concept type headlamp of projection lamp and LED has almost experienced differentiation in more than 120 year.In general, car headlamp is made of three critical pieces, i.e. light source, reflector and lens.In the consideration of aerodynamics and moulding, automotive front is low and be streamlined, and the height that car headlamp can be installed like this is more and more littler.But because the raising of the speed of a motor vehicle is high all the better to auto lamp optics performance demands.Obviously, adopt above-mentioned traditional design can not satisfy these requirements.In order to adapt to the variation of this development, multiple novel scheme has successively appearred, as confocal, how burnt headlamp, many liptical projection formula headlamp and free-form surface reflector (FFR) headlamp.

In recent years, along with the development of auto manufacturing, various new models are increasing to adopt porjection type car light more attractive in appearance to replace traditional mirror-type car light.But the planoconvex spotlight design that the past adopts, sunshine focuses on through after the reflection from lens, and the high-energy of focus melts or burns some parts of decorations circle, lens and the vehicle body of car light easily.

The objective of the invention is in order to overcome the shortcoming of prior art, a kind of car headlamp based on biconvex lens (dipped beam, distance light, front fog lamp) is provided, described scheme has shortened the focal position of sunshine after reflection from lens because of adopting biconvex lens, thus, can effectively stop the phenomenon that light fixture or auto parts and components are melted or burn, respond well, and can improve the safety in utilization and the service life of car light greatly thus.

Summary of the invention

The invention provides a kind of car headlamp based on biconvex lens, described headlamp comprises dipped beam, distance light, front fog lamp, and the technical scheme of described car headlamp based on biconvex lens is as follows:

A kind of car headlamp based on biconvex lens comprises light source, reflector, and baffle plate, and lens is characterized in that, described lens are biconvex lens.

Car headlamp (dipped beam, distance light, front fog lamp) device according to biconvex lens of the present invention, a described biconvex lens, the lens focus design is near the shadow shield dead line, light becomes directional light after the lens outgoing, because the 25 meters test panel (not shown) places that act on of shadow shield obtain dead line clearly, thereby satisfy the technical regulation requirement.Lens adopt the biconvex design, the close focusing mirror point of the one side that radius of curvature is bigger, through experiment test, the planoconvex spotlight that contrast is adopted in the past, the focus point distance of sunshine after reflection from lens reduces greatly, can not melted or burn car light or auto parts and components on every side.Because adopting light source is multi wave length illuminating source, behind lens, can produce aberration, in order to reduce the influence of aberration, make the dead line edge that the colour cast phenomenon not take place to the dead line readability, very high to the error designing requirement of the focal length of lens.The planoconvex spotlight that contrast is adopted in the past, its optical property is unaffected.

According to the car headlamp based on biconvex lens of the present invention, preferably, the surface equation of the outside minute surface of described biconvex lens is (Fig. 5):

The surface equation of the outside minute surface of described biconvex lens is:

$Z={\mathrm{<figure-callout\; id="2"\; label="cr"\; filenames="S2007100943443E00011.png"\; state="\{\{state\}\}">cr</figure-callout>}}^2/(1+\sqrt{1-(1+K)c^2{r}^2})+{\mathrm{\&alpha;}}_1{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="S2007100943443E00011.png"\; state="\{\{state\}\}">r</figure-callout>}}^2+{\mathrm{\&alpha;}}_2{\mathrm{<figure-callout\; id="4"\; label="r"\; filenames="S2007100943443E00011.png,S2007100943443E00021.png"\; state="\{\{state\}\}">r</figure-callout>}}^4+{\mathrm{\&alpha;}}_3{r}^6+{\mathrm{\&alpha;}}_4{\mathrm{<figure-callout\; id="8"\; label="r"\; filenames="S2007100943443E00011.png"\; state="\{\{state\}\}">r</figure-callout>}}^8+{\mathrm{\&alpha;}}_5{r}^{10}$

Wherein

Be quadratic surface, c is a quadratic surface curvature, i.e. the inverse of radius, and r is a radius value, K is the quadratic surface coefficient,

In the formula ,-1＜α ₁, α ₂, α ₃, α ₄, α ₅＜1-1＜K＜1.

According to the car headlamp based on biconvex lens of the present invention, preferably, the inboard minute surface of described biconvex lens is 2-10 with the ratio of the maximum curvature radius of outside minute surface: 1.

That is, the inboard minute surface gradient of described biconvex lens of the present invention is milder, and the gradient of outside minute surface is more protruding.

According to the car headlamp based on biconvex lens of the present invention, preferably, the inboard minute surface of described biconvex lens is 3.5-4 with the ratio of the maximum curvature radius of outside minute surface: 1.

With reference to the inboard minute surface of described biconvex lens and the ratio of the maximum curvature radius of outside minute surface, that is, the steepness of the gradient of the mild and outside minute surface of the inboard minute surface gradient of reference described biconvex lens of the present invention is determined α ₁, α ₂, α ₃, α ₄, α ₅And the value of K.

Thus, because of lens focus designs near shadow shield, light becomes directional light after the lens outgoing, because the effect of shadow shield obtains dead line clearly at 25 meters test panel places, thereby satisfies light distribution requirements.And the colour cast phenomenon does not take place in the dead line edge.

According to the car headlamp based on biconvex lens of the present invention, preferably, described light source is the light source of discharge lamp or Halogen lamp LED.

According to the car headlamp based on biconvex lens of the present invention, preferably, the inboard minute surface of biconvex lens is a sphere, and the outside minute surface of described biconvex lens is a free form surface.

According to the car headlamp based on biconvex lens of the present invention, preferably, free-form surface mirror is non-rotating complete asymmetrical reflector.

According to the car headlamp based on biconvex lens of the present invention, preferably, free-form surface mirror is the non-rotating part symmetrical reflector.

The described free-form surface mirror of free-form surface reflector is through particular design, and the emergent light that can make light source becomes converged state after mirror reflects.

According to the car headlamp based on biconvex lens of the present invention, preferably, described baffle plate is a shadow shield.

In view of the above, shadow shield designs near lens focus, plays the effect of a diaphragm, according to the different technologies laws and regulations requirement, is designed to different structures and obtains different light shapes.

According to the car headlamp based on biconvex lens of the present invention, also comprise a lens fixed support.

Described lens fixed support adopts 3 fixing designs, is beneficial to assembling, good stability.

The operation principle of this device is: light source becomes converged state through behind the free-form surface mirror of particular design, and shadow shield plays the effect of aperture diaphragm, forms dead line at 25 meters test panel places, satisfies the requirement of different technologies rules.On the biconvex lens of light through inciding particular design behind the shadow shield, the focus of biconvex lens designs near shadow shield, guarantees that dead line is clear.Lens adopt at 3 and are fixed on the lens carrier, and support and lamp body are fixed, and have guaranteed the stability of car light optical property.

According to the car headlamp based on biconvex lens of the present invention, adopted the biconvex lens design, shortened the position of solar light focusing point greatly, under the prerequisite that does not influence the car light optical property, eliminate the solar light focusing thawing or burnt car light and reached the possibility of auto parts and components on every side, the security and the service life of having improved car light greatly.

Description of drawings

Fig. 1 is the car light dipped beam schematic diagram of device based on biconvex lens.

Fig. 2 is the solar light focusing contrast schematic diagram of biconvex lens and planoconvex spotlight.

Fig. 3 is the optical property schematic diagram of biconvex lens.

Fig. 4 is the optical property schematic diagram of planoconvex spotlight.

Fig. 5 is the schematic diagram that is used to illustrate the surface equation of biconvex lens outside minute surface.

Among the figure, 1 is light source, and 2 is speculum, and 3 is shadow shield, and 4 is biconvex lens, and 5 is lens carrier, and 6 is planoconvex spotlight, and 8 is lamp body, and L3 is a sunshine, L1, and L2 is respectively reverberation, A, B, C is respectively focus point.

The specific embodiment

Below, with reference to accompanying drawing, the car headlamp based on biconvex lens of the present invention (dipped beam, distance light, front fog lamp) device is described further.

Embodiment 1

Make the biconvex lens headlamp.As shown in Figure 1, in this example, with Halogen lamp LED or discharge lamp as light source 1, the light that sends becomes converged state through speculum 2 backs, shadow shield 3 plays the effect of aperture diaphragm, light is through inciding behind the shadow shield 3 on the biconvex lens 4, and the focus of biconvex lens 4 designs near shadow shield, and dead line is positioned at 25 meters test panel places.Guaranteed that dead line is clear, satisfied the requirement of dipped beam technical regulation.Biconvex lens 4 is fixed on the lamp body 8 by lens carrier 5, has guaranteed the stability of car light optical property.

The car headlamp based on biconvex lens of present embodiment, the inboard minute surface of described biconvex lens is a sphere, the outside minute surface of described biconvex lens is a free form surface.

See Fig. 5, the surface equation of the outside minute surface of described biconvex lens is:

$Z={\mathrm{<figure-callout\; id="2"\; label="cr"\; filenames="S2007100943443E00011.png"\; state="\{\{state\}\}">cr</figure-callout>}}^2/(1+\sqrt{1-(1+K)c^2{r}^2})+{\mathrm{\&alpha;}}_1{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="S2007100943443E00011.png"\; state="\{\{state\}\}">r</figure-callout>}}^2+{\mathrm{\&alpha;}}_2{\mathrm{<figure-callout\; id="4"\; label="r"\; filenames="S2007100943443E00011.png,S2007100943443E00021.png"\; state="\{\{state\}\}">r</figure-callout>}}^4+{\mathrm{\&alpha;}}_3{r}^6+{\mathrm{\&alpha;}}_4{\mathrm{<figure-callout\; id="8"\; label="r"\; filenames="S2007100943443E00011.png"\; state="\{\{state\}\}">r</figure-callout>}}^8+{\mathrm{\&alpha;}}_5{r}^{10}$

Wherein

Be quadratic surface, c is a quadratic surface curvature, i.e. the inverse of radius, and r is a radius value, K is the quadratic surface coefficient,

In the formula ,-1＜α ₁, α ₂, α ₃, α ₄, α ₅＜1-1＜K＜1.

In the present embodiment, the inboard minute surface of described biconvex lens is 3.76: 1 with the ratio of the maximum curvature radius of outside minute surface.

With reference to the inboard minute surface of described biconvex lens and the ratio of the maximum curvature radius of outside minute surface, that is, the steepness of the gradient of the mild and outside minute surface of the inboard minute surface gradient of reference described biconvex lens of the present invention is determined α ₁, α ₂, α ₃, α ₄, α ₅And the value of K.

The contrast of solar light focusing point as shown in Figure 2, sunshine L3 directional light incident at a certain angle, after biconvex lens 1 reflection, reverberation L1 focuses near the A place, after planoconvex spotlight 6 reflections, reverberation L2 focuses near the B, is far smaller than the focus point position through the planoconvex spotlight reflection as can be seen through the focus point position of biconvex lens reflection.

Optical property contrast as shown in Figure 3, Figure 4, the light that is sent by same focus C all obtains directional light L3 behind biconvex lens 4 (as shown in Figure 3) or planoconvex spotlight 6 (as shown in Figure 4), illustrate that the two optical property is identical.

Embodiment 2

In the present embodiment, the protruding height of inboard minute surface of described biconvex lens is 3.3mm, the protruding high 22.76mm of outside minute surface.Biconvex lens maximum gauge 73.7mm.The inboard minute surface of described biconvex lens is 3.46: 1 with the ratio of the maximum curvature radius of outside minute surface.Inboard minute surface spherical radius is 180mm.In addition, other make biconvex lens headlamp of the present invention as embodiment 1.

Embodiment 3

Except in the present embodiment, the protruding height of inboard minute surface of described biconvex lens is 4.1mm, the protruding high 24.06mm of outside minute surface.Biconvex lens maximum gauge 80.5mm.The inboard minute surface of described biconvex lens is 4.2: 1 with the ratio of the maximum curvature radius of outside minute surface.Inboard minute surface spherical radius is 190mm.In addition, other make biconvex lens headlamp of the present invention as embodiment 1.

Embodiment 4

In the present embodiment, except that the ratio of the inboard minute surface of described biconvex lens and the maximum curvature radius of outside minute surface is 2.46: 1, other make biconvex lens headlamp of the present invention as embodiment 1.

Embodiment 5

In the present embodiment, except that the ratio of the inboard minute surface of described biconvex lens and the maximum curvature radius of outside minute surface is 8.46: 1, other make biconvex lens headlamp of the present invention as embodiment 1.

Claims (5)

1. car headlamp based on biconvex lens, comprise light source, reflector, baffle plate and lens, it is characterized in that described lens are biconvex lens, the inboard minute surface of described biconvex lens is a sphere, the outside minute surface of described biconvex lens is a free form surface, and the surface equation of the outside minute surface of described biconvex lens is:

$Z=c{r}^2/(1+\sqrt{1-(1+K)c^2{r}^2})+{\mathrm{\&alpha;}}_1{r}^2+{\mathrm{\&alpha;}}_2{r}^4+{\mathrm{\&alpha;}}_3{r}^6+{\mathrm{\&alpha;}}_4{r}^8+{\mathrm{\&alpha;}}_5{r}^{10}$

Wherein

Be quadratic surface, c is a quadratic surface curvature, i.e. the inverse of radius, and r is a radius value, K is the quadratic surface coefficient,

In the formula ,-1＜α ₁, α ₂, α ₃, α ₄, α ₅＜1-1＜K＜1;

The inboard minute surface of described biconvex lens is 2-10 with the ratio of the maximum curvature radius of outside minute surface: 1.

2. the car headlamp based on biconvex lens as claimed in claim 1, the inboard minute surface of described biconvex lens is 3.5-4 with the ratio of the maximum curvature radius of outside minute surface: 1.

3. the car headlamp based on biconvex lens as claimed in claim 1 is characterized in that, described light source is the light source of discharge lamp or Halogen lamp LED.

4. the car headlamp based on biconvex lens as claimed in claim 1 is characterized in that, described baffle plate is a shadow shield, and shadow shield designs near lens focus.

5. the car headlamp based on biconvex lens as claimed in claim 1 is characterized in that, the lens focus design of biconvex lens is near shadow shield, and dead line is positioned at 25 meters test panel places.

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