CN222634385U - Optical lens group and car lamp using same - Google Patents

Abstract

The utility model discloses an optical lens group and a car lamp using the same, which comprise a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side along an optical axis direction, wherein the first lens is a glass lens, the second lens and the third lens are all plastic lenses, an image side surface of the first lens, an object side surface and an image side surface of the second lens, an object side surface and an image side surface of the third lens are of aspheric structures, the object side surface of the first lens is a plane, the image side surface of the first lens is a convex surface, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, and the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface. The optical lens group is beneficial to miniaturization and light weight of the lamp, reduces the production cost, can obtain better image definition and detail, and has high imaging quality.

Description

Optical lens group and car lamp using same

Technical Field

The utility model relates to the technical field of car lamps, in particular to an optical lens group and a car lamp using the same.

Background

For the optical lens group applied to the car lamp, in the prior art, the widely used three-lens projection lens is mostly made of glass materials, the requirements of glass on the processing technology are high, the production difficulty is high, the cost is increased, and the assembling difficulty of the multi-lens combination is also increased. The more lens combinations and more glass materials result in a significantly increased weight of the projection lens, which is contrary to the popular trend of pursuing weight reduction of vehicle bodies and light weight of vehicle lamps.

In addition, in the prior art, in order to improve the high pixelation of the optical lens group applied in the head lamp, a large number of lens stacking designs are adopted, which causes various negative effects such as increased size, cost, manufacturing difficulty, assembly difficulty and the like of the lens.

In addition, in the prior art, spherical lenses are mostly used as an optical lens group in a vehicle lamp. But the most important problem with spherical lenses is their large aberrations. Because the light rays are subjected to different refraction actions when entering at different positions of the spherical lens, the light rays cannot be completely focused at one point, and aberration is formed. Such aberrations can affect the sharpness and quality of the image, especially in the case of large field angles and high precision requirements, the problem of spherical lens aberrations is more pronounced.

In view of the problems associated with the optical lens assemblies of the prior art, there is a need for further optimization and improvement of the structure thereof.

Disclosure of utility model

The first object of the present utility model is to provide an optical lens assembly to solve the technical problem of optimizing the overall use performance thereof.

The second object of the present utility model is to provide a vehicle lamp, which solves the technical problem of optimizing the overall use performance of an optical lens group used by the vehicle lamp.

The optical lens group of the utility model is realized as follows:

An optical lens group includes a first lens, a second lens, and a third lens arranged in order from an object side to an image side along an optical axis direction;

The first lens is a glass lens, and the second lens and the third lens are plastic lenses;

the image side surface of the first lens, the object side surface and the image side surface of the second lens, and the object side surface and the image side surface of the third lens are all aspheric structures, and

The object side surface of the first lens is a plane, the image side surface of the first lens is a convex surface, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, and the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface.

In an alternative embodiment of the utility model, the object side of the first lens is provided with a light source.

In the alternative implementation case of the utility model, the distance d01 between the object side surface of the first lens and the light source component satisfies that d01 is more than or equal to 1mm.

In an alternative embodiment of the present utility model, 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, where:

n1<n2;n2>n3。

In an alternative implementation of the present utility model, the image side surface of the third lens satisfies the following formula 9mm < Sa <15mm, where Sa is the degree of protrusion of the lens surface.

In an alternative embodiment of the present utility model, the focal length of the first lens is f1, the focal length of the second lens is f2, and the focal length of the third lens is f3, where:

300mm<f2<1300mm;100mm<f3<200mm;0<f1/f2<0.1。

In an alternative embodiment of the present utility model, the light emission aperture D1 of the first lens and the center thickness T1 of the first lens satisfy the following relationship of D1/T1> =1 3.

In the alternative implementation case of the utility model, the total length L of the optical axis of the optical lens group meets the following relation that L is more than or equal to 60mm and less than or equal to 70mm.

In an alternative embodiment of the present utility model, the first lens, the second lens and the third lens are all positive lenses.

The car lamp is realized by the following steps:

A car lamp comprises the optical lens group.

The optical lens group and the car lamp using the same have the advantages that only 3 lenses are adopted, and 2 lenses are plastic lenses, so that the miniaturization and the light weight of the lamp are facilitated, the production cost is reduced, moreover, the adopted lenses are aspheric lenses, light rays can be focused more accurately, the overall axial distortion difference is smaller, better image definition and detail can be obtained, and the imaging quality is high. The optical lens group can better transmit light, reduce the scattering and reflection of the light, and improve the transmission and imaging capability of the optical lens group to the light.

Drawings

Fig. 1 is a schematic diagram of the structure of an optical lens assembly of embodiment 2;

fig. 2 is a schematic structural diagram of an optical lens assembly of embodiment 3;

fig. 3 is a schematic structural diagram of an optical lens assembly of embodiment 4;

Fig. 4 is a field curvature diagram of the optical lens assembly of embodiment 2;

Fig. 5 is a distortion chart of the optical lens group of embodiment 2;

FIG. 6 is a field curvature diagram of an optical lens assembly according to embodiment 3;

Fig. 7 is a distortion chart of the optical lens group of embodiment 3;

Fig. 8 is a field curvature diagram of an optical lens assembly of embodiment 4;

Fig. 9 is a distortion chart of the optical lens group of embodiment 4.

In the figure, a first lens element 1, an object-side surface 11 of the first lens element, an image-side surface 12 of the first lens element, an object-side surface 21 of the second lens element, an image-side surface 22 of the second lens element, an object-side surface 31 of the third lens element, an image-side surface 32 of the third lens element, and an optical axis 4.

Detailed Description

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

Example 1:

Referring to fig. 1 to 9, the present embodiment provides an optical lens assembly, which includes a first lens element 1, a second lens element 2 and a third lens element 3 sequentially disposed from an object side to an image side along an optical axis 4, wherein an object side of the first lens element 1 is provided with a light source 5.

Specifically, the first lens 1, the second lens 2 and the third lens 3 are all positive lenses, the first lens 1 is a glass lens, and the second lens 2 and the third lens 3 are all plastic lenses. Under this structure, that is to say that the optical lens group adopted in this embodiment adopts only 3 lenses, and wherein 2 lenses are plastic lenses, is favorable to the miniaturization and the light weight of lamps and lanterns, reduction in production cost.

In more detail, the image side 12 of the first lens element 1, the object side 21 and the image side 22 of the second lens element 2, and the object side 31 and the image side 32 of the third lens element 3 are aspheric, the object side 11 of the first lens element 1 is planar and the image side 12 is convex, the object side 21 of the second lens element 2 is concave and the image side 22 is convex, and the object side 31 of the third lens element 3 is concave and the image side 32 is convex.

Based on the above, in the present embodiment, the distance d01 between the object side surface 11 of the first lens 1 and the light source assembly satisfies that d01+.1mm. 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, then n1< n2, n2> n3. The image side surface 32 of the third lens 3 satisfies the following formula 9mm < Sa <15mm, where Sa is the degree of convexity of the lens surface.

In addition, the focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, and the focal length of the third lens 3 is f3, then 300mm < f2<1300mm, 100mm < f3<200mm, 0< f1/f2<0.1. Note that the light emission aperture D1 of the first lens 1 and the center thickness T1 of the first lens 1 satisfy the following relationship of D1/T1> =1 3.

Based on the structure, the total length L of the optical axis of the optical lens group meets the following relation that L is more than or equal to 60mm and less than or equal to 70mm.

In summary, for the optical lens assembly of the present embodiment, light can be focused more accurately, the overall axial distortion difference is smaller, better image definition and detail can be obtained, and the imaging quality is high. The optical lens group can better transmit light, reduce the scattering and reflection of the light, and improve the transmission and imaging capability of the optical lens group to the light.

Example 2:

Referring to fig. 1, 4 and 5, on the basis of the optical lens assembly of embodiment 1, the parameters of the optical lens assembly provided in this embodiment are as follows:

TABLE 1

The focal length f1 of the first lens element 1 is 22.1mm, the focal length f2 of the second lens element 2 is 426.4mm, the focal length f3 of the third lens element 3 is 158mm, the light-emitting aperture D1 of the first lens element 1 is 32.6mm, the center thickness T1 is 25mm, the distance D01 between the object side surface 11 of the first lens element 1 and the light source is 1mm, the total lens axis length L is 66.4, and the surface protrusion degree Sa of the image side surface 32 of the third lens element 3 is 9.8mm.

The image side surface 11 of the first lens element 1, the object side surface 21 and the image side surface 22 of the second lens element 2, and the object side surface 31 and the image side surface 32 of the third lens element 3 are aspheric lenses. Wherein, the aspherical expression is as follows:

Where c is the paraxial curvature of the aspherical surface, ak is the higher order term coefficient, K is the conic coefficient, where k= -e2, e is the eccentricity of the conic curve.

The aspherical coefficients of the first lens 2, the second lens 2, and the third lens 3 of the present embodiment are shown in table 2:

TABLE 2

Referring to fig. 4, the field curvature of the optical lens assembly of the present embodiment is shown with the abscissa representing the defocus amount in mm and the ordinate representing the image height in mm.

Referring to fig. 5, the distortion diagram of the optical lens assembly of the present embodiment is shown with the abscissa representing the distortion value in percent and the ordinate representing the image height in mm.

As can be seen from the simulation results of fig. 4 and 5, the optical lens assembly of the present embodiment has smaller overall axial distortion difference, and can obtain better image definition and detail, and high imaging quality. The defocus amount is smaller, which helps to reduce image distortion. And distortion phenomena such as image blurring, ghost images or deformation are reduced. The lens can better transmit light, reduce the scattering and reflection of the light, and improve the transmission and imaging capability of the lens to the light.

Example 3:

Referring to fig. 2, 6 and 7, on the basis of the optical lens assembly of embodiment 1, the parameters of the optical lens assembly provided in this embodiment are as follows:

TABLE 3 Table 3

The focal length f1 of the first lens element 1 is 22.127mm, the focal length f2 of the second lens element 2 is 1266.53mm, the focal length f3 of the third lens element 3 is 123.5mm, the light-emitting aperture D1 of the first lens element 1 is 32.6mm, the center thickness T1 is 23.9mm, the distance D01 = 1.2mm between the object side surface 11 of the first lens element 1 and the light source is 1.7 mm, the total lens optical axis length L = 60.7, and the surface protrusion degree Sa = 12.4mm of the image side surface 32 of the third lens element 3.

The image side 12 of the first lens element 1, the object side 21 and the image side 22 of the second lens element 2, and the object side 31 and the image side 32 of the third lens element 3 are aspheric lenses. Wherein, the aspherical expression is as follows:

Where c is the paraxial curvature of the aspherical surface, ak is the higher order term coefficient, K is the conic coefficient, where k= -e2, e is the eccentricity of the conic curve.

The aspherical coefficients of the first lens 1, the second lens 2, and the third lens 3 of the present embodiment are shown in table 4:

Referring to fig. 6, a field curve of the optical lens assembly of the present embodiment is shown with the abscissa representing defocus amount in mm and the ordinate representing image height in mm.

Referring to fig. 7, the distortion diagram of the optical lens assembly of the present embodiment is shown with the abscissa representing the distortion value in percent and the ordinate representing the image height in mm.

As can be seen from the simulation results of fig. 6 and 7, the optical lens assembly of the present embodiment has a smaller overall axial distortion difference, and can obtain better image definition and detail, and has high imaging quality. The defocus amount is smaller, which helps to reduce image distortion. And distortion phenomena such as image blurring, ghost images or deformation are reduced. The lens can better transmit light, reduce the scattering and reflection of the light, and improve the transmission and imaging capability of the lens to the light.

Example 4:

Referring to fig. 3, 8 and 9, on the basis of the optical lens assembly of embodiment 1, the parameters of the optical lens assembly provided in this embodiment are as follows:

TABLE 5

The focal length f1 of the first lens element 1 is 24.19mm, the focal length f2 of the second lens element 2 is 353.8mm, the focal length f3 of the third lens element 3 is 196.06mm, the light-emitting aperture D1 of the first lens element 1 is 32.6mm, the center thickness T1 is 25mm, the distance d01=2.4 mm between the object side surface 11 of the first lens element 1 and the light source assembly, the total optical axis length l=70 of the optical lens assembly of the present embodiment, and the image side surface 32 surface protrusion degree sa=14.54 mm of the third lens element 3.

The image side 12 of the first lens element 1, the object side 21 and the image side 22 of the second lens element 2, and the object side 31 and the image side 32 of the third lens element 3 are aspheric lenses. Wherein, the aspherical expression is as follows:

Where c is the paraxial curvature of the aspherical surface, ak is the higher order term coefficient, K is the conic coefficient, where k= -e2, e is the eccentricity of the conic curve.

The aspherical coefficients of the first lens 1, the second lens 2, and the third lens 3 of the present embodiment are shown in table 6:

Referring to fig. 8, a field curve of the optical lens assembly of the present embodiment is shown with the abscissa representing defocus amount in mm and the ordinate representing image height in mm.

Referring to fig. 9, the distortion diagram of the optical lens assembly of the present embodiment is shown with the abscissa representing the distortion value in percent and the ordinate representing the image height in mm.

As can be seen from the simulation results of fig. 8 and 9, the optical lens assembly of the present embodiment has a smaller overall axial distortion difference, and can obtain better image definition and detail, and has high imaging quality. The defocus amount is smaller, which helps to reduce image distortion. And distortion phenomena such as image blurring, ghost images or deformation are reduced. The lens can better transmit light, reduce the scattering and reflection of the light, and improve the transmission and imaging capability of the lens to the light.

Example 5:

On the basis of the optical lens group of the embodiment 1, the embodiment provides a car lamp, which comprises the optical lens group of the embodiment.

For the industrial camera of the embodiment, only one adjusting component is needed to drive the focal length adjusting gear s2 and the aperture adjusting gear s1, so that the adjustment of the focal length and the aperture of the lens is realized by one adjusting component, the structure of the whole lens adjusting device is simplified, and the adjustment requirements of the focal length and the aperture of the lens are met.

The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present utility model, and are more fully described herein with reference to the accompanying drawings, in which the principles of the present utility model are shown and described, and in which the general principles of the utility model are defined by the appended claims.

In the description of the present utility model, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present utility model, unless expressly stated or limited otherwise, a first feature may include first and second features directly contacting each other, either above or below a second feature, or through additional features contacting each other, rather than directly contacting each other. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.

Claims (10)

1. An optical lens group is characterized by comprising a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side along an optical axis direction;

The first lens is a glass lens, and the second lens and the third lens are plastic lenses;

the image side surface of the first lens, the object side surface and the image side surface of the second lens, and the object side surface and the image side surface of the third lens are all aspheric structures, and

The object side surface of the first lens is a plane, the image side surface of the first lens is a convex surface, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, and the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface.

2. The optical lens assembly of claim 1, wherein the object side surface of the first lens element is provided with a light source.

3. The optical lens assembly of claim 2, wherein a distance d01 between the object side surface of the first lens and the light source assembly is d01 being equal to or greater than 1mm.

4. The optical lens assembly of claim 1, wherein the first lens has a refractive index n1, the second lens has a refractive index n2, and the third lens has a refractive index n3, and wherein:

n1<n2;n2>n3。

5. The optical lens group according to claim 1, wherein the image side surface of the third lens satisfies the following formula 9mm < Sa <15mm, where Sa is the degree of protrusion of the lens surface.

6. The optical lens assembly of claim 1, wherein the first lens has a focal length f1, the second lens has a focal length f2, and the third lens has a focal length f3, and wherein:

300mm<f2<1300mm;100mm<f3<200mm;0 < f1/f2 < 0.1。

7. The optical lens group according to claim 1, wherein the light emission aperture D1 of the first lens and the center thickness T1 of the first lens satisfy the following relationship D1/T1 > = 1 3.

8. The optical lens group according to claim 1, wherein the total length L of the optical axis of the optical lens group satisfies the following relation that L is 60 mm.ltoreq.L.ltoreq.70 mm.

9. The optical lens assembly of claim 1, wherein the first lens, the second lens and the third lens are all positive lenses.

10. A vehicle lamp comprising the optical lens set according to any one of claims 1 to 9.