CN216408834U - Optical lens group for car lamp - Google Patents

Abstract

The utility model discloses an optical lens group for a car lamp, which comprises three lenses, wherein a first lens, a second lens and a third lens are sequentially arranged on the three lenses from the side of a light source to the outer side; let the opening diameter of the first lens be D1, the opening diameter of the second lens be D2, and the opening diameter of the third lens be D3; the focal length of the first lens is f1, the focal length of the second lens is f2, the combined focal length generated by the three lenses is f, the combined focal length of the first lens and the second lens is f12, the refractive index of the first lens is n1, the refractive index of the second lens is n2, and the refractive index of the third lens is n3, then the following relations are satisfied: d1 < D2 < D3; f is more than or equal to 25 and less than or equal to 33mm, f is more than 19mm and less than 25mm in f12, and f12/f is more than 0.7 and less than 0.8; n1 is not less than n2 is less than n 3. Compared with the optical structure in the prior art, the utility model adopts the design scheme of three lenses, realizes the technical breakthrough of the lens group on high-performance imaging through the reasonable proportion of the opening diameter, the focal length and the refractive index of the three lenses, and simultaneously can shorten the axial total length of the optical lens group.

Description

Optical lens group for car lamp

Technical Field

The utility model relates to the field of vehicle lamp illumination, in particular to an optical lens group for a vehicle lamp, which is mainly used for illuminating a vehicle headlamp.

Background

With the rapid development of the front lamp technology of the automobile, the optical module capable of projecting the multi-zone illumination area is increasingly becoming a popular technology for the research of various large lamp factories. The light collimation efficiency of the single-lens optical scheme cannot meet the design requirement of increasing the number of pixels at present, and the multi-lens optical scheme has the defects of large length and large caliber, so that the volume of the car lamp is increased, the attractiveness of a car body structure cannot be realized, and the current multi-lens scheme cannot meet the pixel requirement of more than one hundred-grade pixels.

In order to obtain better imaging quality, the utility model provides a scheme for realizing the imaging function by three lenses.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that an optical scheme in the prior art cannot meet the requirement of high pixels, the utility model provides an optical lens group for a vehicle lamp, which can not only meet the requirement of hundred-level pixels, but also has short overall length, thereby reducing the volume of the vehicle lamp and ensuring the attractiveness of a vehicle body structure.

The technical scheme adopted by the utility model for solving the technical problems is as follows: an optical lens group for a car lamp comprises three lenses, wherein the three lenses are a first lens, a second lens and a third lens from a light source side to an outer side in sequence; let the opening diameter of the first lens be D1, the opening diameter of the second lens be D2, and the opening diameter of the third lens be D3; the focal length of the first lens is f1, the focal length of the second lens is f2, the combined focal length generated by the three lenses is f, the combined focal length of the first lens and the second lens is f12, the refractive index of the first lens is n1, the refractive index of the second lens is n2, and the refractive index of the third lens is n3, then the following relations are satisfied:

D1＜D2＜D3；25≤f≤33mm，19mm<f12<25mm、0.7<f12/f<0.8；n1≤n2＜n3。

further, the maximum opening diameter D of three lenses satisfies the following condition: d is more than 40mm and less than 50 mm.

Furthermore, at least two aspheric lenses are arranged in the three lenses, and 0.8< f1/f2< 1.2.

Furthermore, at least one glass aspheric lens with an antireflection film in the three lenses.

Furthermore, at least two of the three lenses have positive refractive power.

Further, the field angle FOV of the optical lens group for the vehicle lamp satisfies the following condition: -23 ° < FOV <23 °.

Further, the first lens is a plano-convex lens, the light incident surface of the first lens is a plane, the second lens is a hyperboloid lens, the third lens is a concave-convex lens, and the light incident surface of the third lens is a concave surface.

Further, the first lens is made of an optical glass material, and the second lens and the third lens are made of optical glass or high-temperature plastic.

The utility model has the beneficial effects that:

(1) compared with the optical structure in the prior art, the optical lens group for the vehicle lamp adopts the design scheme of the three lenses, realizes the technical breakthrough of the lens group on high-performance imaging through the reasonable proportion of the opening diameter, the focal length and the refractive index of the three lenses, and simultaneously can shorten the axial total length of the optical lens group.

(2) The utility model reduces the maximum aperture of the lens, and further reduces the whole size on the basis of meeting the imaging performance.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

Fig. 1 is a front view of a first embodiment of an optical lens group for a vehicle lamp according to the present invention;

FIG. 2 is a schematic view showing curvature of field and distortion of light having a wavelength of 486nm passing through the optical lens assembly for a vehicle lamp shown in FIG. 1;

FIG. 3 is a schematic diagram showing the chromatic aberration of magnification of light with wavelengths of 486nm, 588nm and 656nm passing through the optical lens set for the vehicle lamp shown in FIG. 1;

fig. 4 is a schematic axial chromatic aberration diagram of light with wavelengths of 486nm, 588nm and 656nm passing through the optical lens group for the vehicle lamp shown in fig. 1.

In the figure, 1 is a first lens, 2 is a second lens, 3 is a third lens.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

An optical lens group for a car lamp comprises three lenses, wherein the three lenses are a first lens 1, a second lens 2 and a third lens 3 from a light source side to the outer side in sequence. Let the opening diameter of the first lens 1 be D1, the opening diameter of the second lens 2 be D2, and the opening diameter of the third lens 3 be D3; the focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, the combined focal length generated by the three lenses is f, the combined focal length of the first lens 1 and the second lens 2 is f12, the refractive index of the first lens 1 is n1, the refractive index of the second lens 2 is n2, and the refractive index of the third lens 3 is n3, the following relations are satisfied:

D1＜D2＜D3。

25≤f≤33mm，19mm<f12<25mm、0.7<f12/f<0.8。

n1≤n2＜n3。

when the present invention satisfies the above configuration relationship, a technical breakthrough of hundreds of pixels can be realized, and the total axial length of the optical lens assembly can be shortened.

Fig. 1 shows an optical lens assembly for a vehicle lamp according to a first embodiment of the present invention, in which a first lens 1 is a plano-convex lens, an incident surface of the first lens 1 is a plane, and an emergent surface thereof is a convex surface, incident light can be uniformly dispersed to the emergent surface of the first lens 1 through the plane, a second lens 2 is a hyperboloid lens, both the incident surface and the emergent surface of the second lens 2 are convex surfaces, a light beam emitted from the first lens 1 has a large angle, the angle of the light beam can be adjusted by the second lens 2 to shape the light beam, a third lens 3 is a meniscus lens, and the incident surface of the third lens 3 is a concave surface, and the emergent surface thereof is a convex surface, so that the light beam can be emitted approximately horizontally. The first lens 1 is made of optical glass material, and the second lens 2 and the third lens 3 are made of optical glass or high-temperature plastic.

Preferably, the maximum opening diameter D of three lenses satisfies the following condition: d is more than 40mm and less than 50 mm. D is the maximum value among D1, D2 and D3, the overall opening size of the lens is small, and the design requirement of the small size of the automotive light-level optical lens is met.

Preferably, there are at least two aspheric lenses in the three lenses, in this embodiment, the first lens 1, the second lens 2 and the third lens 3 are all aspheric lenses, the focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, and 0.8< f1/f2<1.2, and the combination design of the selection of the aspheric lenses and the lens focal length configuration relationship can be used to correct the phase difference and correct different parameters of different regions. In a further design, at least one of the three lenses is a glass aspheric lens with an antireflection film, which is the first lens 1 in this embodiment, for achieving a better imaging effect.

In order to achieve light collection, it is also often necessary to satisfy: at least two of the three lenses have positive refractive power, and the first lens element 1 and the second lens element 2 in this embodiment are positive refractive power lenses, so as to ensure the imaging effect of the orthographic projection.

In this embodiment, the field angle FOV of the optical lens assembly for a vehicle lamp satisfies the following condition: -23 ° < FOV <23 °.

The following shows design data of the optical lens group for a vehicle lamp according to the first embodiment.

Table 1 shows the parameter values of the optical lens group for a vehicle lamp of the first embodiment.

Parameter and condition formula	Examples
		F	28.7mm
f1	41.1mm
		f2	38.9mm
f3	-1045mm
		f12	21.78mm
f1/f2	1.05
		D1	32mm
D2	44.8mm
		D3	46.4mm
n1	1.517
		n2	1.534
n3	1.585
		T1	26.52mm
T2	14.74mm
		T3	11.98mm
T12	1.85mm
		T23	13.92mm

Wherein the content of the first and second substances,

f represents the combined focal length of the three lenses;

f1 denotes the focal length of the first lens 1;

f2 denotes the focal length of the second lens 2;

f3 denotes the focal length of the third lens 3;

f12 denotes the combined focal length of the first lens 1 and the second lens 2;

d1 denotes the outer diameter aperture of the first lens 1;

d2 denotes the outer diameter aperture of the first lens 1;

d3 denotes the outer diameter aperture of the first lens 1;

n1 denotes the refractive index of the first lens 1;

n2 denotes the refractive index of the second lens 2;

n3 denotes the refractive index of the third lens 3;

t1 denotes the center thickness of the first lens 1;

t2 denotes the center thickness of the second lens 2;

t3 denotes the center thickness of the third lens 3;

t12 denotes an air space between the first lens 1 and the second lens 2;

t23 denotes an air space between the second lens 2 and the third lens 3.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (8)

1. The utility model provides an optical lens group for car light which characterized in that: the LED lamp comprises three lenses, wherein a first lens (1), a second lens (2) and a third lens (3) are sequentially arranged from the light source side to the outer side of the three lenses;

let the opening diameter of the first lens (1) be D1, the opening diameter of the second lens (2) be D2, and the opening diameter of the third lens (3) be D3; the focal length of the first lens (1) is f1, the focal length of the second lens (2) is f2, the combined focal length generated by the three lenses is f, the combined focal length of the first lens (1) and the second lens (2) is f12, the refractive index of the first lens (1) is n1, the refractive index of the second lens (2) is n2, and the refractive index of the third lens (3) is n3, so that the following relations are satisfied:

D1＜D2＜D3；

25≤f≤33mm，19mm<f12<25mm、0.7<f12/f<0.8；

n1≤n2＜n3。

2. the optical lens group for vehicle lamp according to claim 1, characterized in that: the maximum opening diameter D of three lenses meets the following condition: d is more than 40mm and less than 50 mm.

3. The optical lens group for vehicle lamp according to claim 1, characterized in that: at least two aspheric lenses are arranged in the three lenses, and 0.8< f1/f2< 1.2.

4. The optical lens group for vehicle lamp according to claim 1, characterized in that: at least one glass aspheric lens with an antireflection film in the three lenses.

5. The optical lens group for vehicle lamp according to claim 1, characterized in that: at least two of the three lenses have positive refractive power.

6. The optical lens group for vehicle lamp according to claim 1, characterized in that: the field angle FOV of the optical lens group for the vehicle lamp meets the following conditions: -23 ° < FOV <23 °.

7. The optical lens group for vehicle lamp according to claim 1, characterized in that: first lens (1) are plano-convex lens, and the income plain noodles of first lens (1) are the plane, second lens (2) are hyperboloid lens, third lens (3) are meniscus lens, and the income plain noodles of third lens (3) are the concave surface.

8. The optical lens group for vehicle lamp according to claim 7, characterized in that: the first lens (1) is made of optical glass materials, and the second lens (2) and the third lens (3) are made of optical glass or high-temperature plastics.

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