KR102494374B1 - Lens Assembly for vehicle - Google Patents

Abstract

The present invention relates to a lens assembly for a vehicle, and the lens assembly for a vehicle according to the present invention includes a first lens group, a second lens group, and a third lens group disposed in order from an object side toward an image side, wherein the The first lens group has negative refractive power, the second lens group has positive refractive power, the third lens group has positive or negative refractive power, the first lens group includes a plastic lens, The second lens group or the third lens group is characterized in that it includes lenses made of glass.

Description

Lens assembly for vehicle {Lens Assembly for vehicle}

The present invention relates to a lens assembly for automobiles, and more particularly, to reduce manufacturing cost by limiting the use of a glass lens to one automobile, realizes wide-angle high resolution, and at the same time guarantees resolution even in a wide range of temperature changes. It relates to a lens assembly for use.

BACKGROUND OF THE INVENTION In general, cameras are mounted in mobile communication terminals, computers, laptop computers, automobiles, etc. to show surrounding image information or to take pictures. In accordance with the slimming trend of mobile communication terminals and miniaturization of computers and laptops, cameras are also required to be small and lightweight and have high image quality. of cameras are in demand. In addition, such a camera should have a wide angle of view to obtain as wide a range of image information as possible.

1 is a diagram showing a conventional wide-angle lens system.

This wide-angle lens system includes a first lens L1, a second lens L2, a third lens L3, an aperture AS, a fourth lens L4, a fifth lens L5, and a second lens L5 in order from the object side. A sixth lens L6 is disposed. An optical filter (OF) such as an infrared filter or a cover glass is disposed between the sixth lens (L6) and the imaging surface (IP).

The first lens L1 and the second lens L2 have a convex meniscus shape toward the object side, and the curvature radii of the object-side surfaces 1 and 3 are greater than the curvature radii of the image-side surfaces 2 and 4. big.

The third and fourth lenses L3 and L4 have object-side surfaces 5 and 7 convex toward the object and image-side surfaces 6 and 8 convex toward the image side.

The fifth lens L5 is bonded to the fourth lens L4 to form one lens group. The fifth lens L5 has an object side surface 9 concave toward the object side and an image side surface 10 concave toward the image side. The sixth lens L6 has an object-side surface 11 convex toward the object side and an image-side surface 12 convex toward the image side.

Such a conventional wide-angle lens system is made by mixing six spherical glass lenses and aspherical glass lenses to implement a wide angle. At least 5 to 6 glass lenses must be used to ensure the same resolution under severe temperature conditions inside and outside the car during the hot season.

Such a wide-angle lens system has an advantage in that the change in resolution is small due to the characteristics of the glass material, but the number of glass lenses must be increased to realize high resolution. In addition, in order to reduce the manufacturing cost, only a spherical glass lens should be formed, but in this case, a limit occurs in increasing the resolution of the wide-angle lens system.

If the number of plastic lenses is increased to increase the resolution and reduce the number of lenses, a change in resolution occurs due to a change in the refractive index due to a change in the temperature of the plastic material in the harsh temperature conditions of automobiles and external surveillance environments, resulting in unsatisfactory results. .

Patent Publication No. 10-2013-0119307 (published on October 31, 2013)

Accordingly, an object of the present invention is to solve such conventional problems, to reduce the manufacturing cost by limiting the use of a glass lens to one sheet, to realize wide-angle high resolution and to improve resolution even in a wide temperature change. It is to provide a lens assembly for automobiles that can be guaranteed.

The object according to the present invention includes a first lens group, a second lens group, and a third lens group disposed in order from the object side toward the image side, wherein the first lens group has a negative refractive power, The second lens group has a positive refractive power, the third lens group has a positive or negative refractive power, the first lens group includes a lens made of a plastic material, and the second or third lens group is made of a glass material. It is achieved by a lens assembly for a vehicle, characterized in that it comprises a lens of.

Here, it is preferable that the power ratio of the first lens group is -0.874 to -0.092, the power ratio of the second lens group is 0.434 to 0.702, and the power ratio of the third lens group is -0.216 to 0.370. do.

In addition, the first lens group includes a first lens, the second lens group includes a second lens and a third lens, the third lens group includes a fourth lens and a fifth lens, Preferably, the fourth lens is made of a glass material, and the first, second, third, and fifth lenses are made of a plastic material.

In addition, the first lens group includes a first lens and a second lens, the second lens group includes a third lens, the third lens group includes a fourth lens and a fifth lens, Preferably, the third lens is made of a glass material, and the first, second, fourth, and fifth lenses are made of a plastic material.

In addition, the first lens group preferably includes a plastic first lens having negative refractive power, being convex or concave toward the object, and having at least one surface aspheric.

In addition, the second lens group may include: a second lens made of a plastic material having positive or negative refractive power, being concave or convex toward the object, and having at least one surface aspheric; and a third lens having positive refractive power and having a biconvex or meniscus shape, made of plastic or glass.

In addition, the third lens group preferably includes a fourth lens having positive or negative refractive power, having a double-sided convex or concave shape, and made of plastic or glass.

Preferably, the third lens group further includes a fifth lens made of a plastic material having positive or negative refractive power and at least one surface of which is an aspheric surface.

Accordingly, an object of the present invention is to solve such conventional problems, to reduce the manufacturing cost by limiting the use of a glass lens to one sheet, to realize wide-angle high resolution and to improve resolution even in a wide temperature change. A lens assembly for automobiles that can be guaranteed is provided.

1 shows a conventional wide-angle lens system;
2 is a cross-sectional view showing the configuration of a lens assembly for a vehicle according to a first embodiment of the present invention;
3 is a view showing a path of light through the lens assembly for a vehicle shown in FIG. 2;
4 to 6 are views showing light paths according to various embodiments of the present invention;
7 and 8 are graphs showing changes in optical characteristics according to temperature changes of the lens assembly for automobiles according to the present invention;
9 is a graph of the peripheral light amount ratio of the lens assembly for a vehicle of the present invention
10 is a Chief Ray Angle graph of the lens assembly for automobiles of the present invention
11 is a distortion graph of a lens assembly for a vehicle according to the present invention.

Prior to description, in various embodiments, components having the same configuration are typically described in the first embodiment using the same reference numerals, and in other embodiments, components different from those of the first embodiment will be described. do.

Hereinafter, a lens assembly 100 for a vehicle according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Among the accompanying drawings, FIG. 2 is a cross-sectional view showing the configuration of a lens assembly for a vehicle according to a first embodiment of the present invention, and FIG. 3 is a view showing a path of light passing through the lens assembly for a vehicle shown in FIG. 2 .

As shown in the drawings, the lens assembly 100 for a vehicle according to the present invention includes a first lens group G1, a second lens group G2, and It includes a third lens group G3, wherein the first lens group G1 has negative refractive power, the second lens group G2 has positive refractive power, and the third lens group G3 has positive or positive refractive power. has negative refractive power.

The object side OS may indicate a direction in which light is incident, and the image side IS may indicate a direction in which light is output. For example, when the lens assembly 100 is applied to an imaging optical system, the object side (OS) may indicate a direction in which a subject exists and the image side (IS) may indicate a direction in which an image is formed.

The power ratio of the first lens group G1 is -0.874 to -0.092, the power ratio of the second lens group G2 is 0.434 to 0.702, and the power ratio of the third lens group G3 is -0.216 to 0.370 is set in the range of

Hereinafter, specific embodiments of the lens assembly 100 will be described through the first to fourth embodiments of the wide-angle lens system of the present invention.

<First Embodiment>

Among the plurality of lenses constituting the lens assembly 100, the first lens group G1 is disposed closest to the object side OS and has an incident surface concave toward the object side OS and toward the image side IS. It includes a first lens 110 made of plastic, having a concave exit surface, having negative refractive power, and having at least one surface aspherical.

The second lens group G2 is disposed close to the exit surface facing the image side IS of the first lens 110 and has a convex incident surface toward the object side OS and a convex toward the image side IS. A second lens 120 made of plastic material having an exit surface, having negative refractive power, and having at least one surface aspherical, disposed close to the exit surface facing the image side (IS) of the second lens 120 and disposed on the object side (OS) ) has a concave entrance surface and a convex exit surface toward the image side (IS), has a positive refractive power, and includes a third lens 130 made of plastic material of which at least one surface is an aspheric surface, and the second lens 120 and The combined refractive power of the third lens 130 is set to have positive refractive power.

The third lens group G3 is disposed close to the exit surface facing the image side IS of the third lens 130 and has a convex incident surface toward the object side OS and a convex toward the image side IS. A fourth lens 140 made of glass having an exit surface, having a positive refractive power, and having an incident surface and an exit surface each being a spherical surface, and disposed close to the exit surface facing the image side (IS) of the fourth lens 140 Among the plurality of lenses constituting the lens assembly 100, it is disposed closest to the image side (IS), has a concave entrance surface toward the object side (OS) and a concave exit surface toward the image side (IS), has negative refractive power, and has at least It includes a fifth lens 150 made of a plastic material with one surface aspherical, and the combined refractive power of the fourth lens 140 and the fifth lens 150 is set to have negative refractive power.

In the description of the shape of the lens, a convex shape means that the optical axis portion of the corresponding surface is convex, and a concave shape means that the optical axis portion of the corresponding surface is concave. Therefore, even if one surface of the lens is described as having a convex shape, the edge portion of the lens may be concave. Likewise, even if one surface of the lens is described as having a concave shape, the edge portion of the lens may be convex.

Meanwhile, an aperture AS may be disposed between the second lens 120 and the third lens 130 . The aperture (AS) controls the amount of light passing through the lens by adjusting the size of the hole.

In addition, an optical filter (OF) may be disposed on the exit surface of the fifth lens 150 facing the image side (IS). The optical filter OF may include at least one of a low pass filter, an infrared (IR)-cut filter, and a cover glass. For example, when an infrared cut-off filter is provided as the optical filter (OF), visible light may be transmitted and infrared light may be emitted to the outside. In addition, it is also possible to configure the lens assembly 100 without an optical filter (OF).

In the first embodiment, the fourth lens 140 constituting the lens assembly 100 is made of a glass material, and the first lens 110, the second lens 120, the third lens 130 and the The fifth lens 150 is made of a plastic material.

In addition, the power ratio of the first lens group G1 is -0.548, the power ratio of the second lens group G2 is 0.638, and the power ratio of the third lens group G3 is set to -0.175.

In addition, the focal length of the first lens 110 is -5.787mm, the focal length of the second lens 120 is 7.52mm, the focal length of the third lens 130 is 8.65mm, and the focal length of the fourth lens 140 is 6.93mm. , the focal length of the fifth lens 150 is designed to be -4.62 mm. Accordingly, the focal length of the first lens group G1 comprising the first lens 110 is set to -5.787 mm, and the second lens group G2 comprising a combination of the second lens 120 and the third lens 130 is set. The combined focal length of ) is set to 4.97mm, the combined focal length of the third lens group G3 consisting of a combination of the fourth lens 140 and the fifth lens 150 is set to -18.13mm, and the lens assembly 100 ), the total effective focal length (EFL) is set to 3.173 mm.

<Second Embodiment>

The first lens group G1 has a concave entrance surface toward the object side (OS) and a concave exit surface toward the image side (IS), has negative refractive power, and has at least one surface made of an aspherical plastic material. It includes one lens (110).

The second lens group G2 has a convex entrance surface toward the object side (OS) and a concave exit surface toward the image side (IS), has negative refractive power, and has at least one surface of an aspherical surface, made of plastic material ( 120), a third lens 130 made of a plastic material having a convex entrance surface toward the object side (OS) and a convex exit surface toward the image side (IS), having positive refractive power, and having at least one surface aspherical, The combined refractive power of the second lens 120 and the third lens 130 is set to have positive refractive power.

The third lens group G3 has a convex entrance surface toward the object side (OS) and a convex exit surface toward the image side (IS), has positive refractive power, and has a spherical entrance surface and an exit surface, respectively, made of glass. 4 lenses 140, a fifth lens 150 made of plastic having a concave entrance surface toward the object side (OS) and a concave exit surface toward the image side (IS), having negative refractive power, and having at least one surface aspherical. The combined refractive power of the fourth lens 140 and the fifth lens 150 is set to have a positive refractive power.

An aperture AS may be disposed between the second lens 120 and the third lens 130 .

In the second embodiment, the fourth lens 140 constituting the lens assembly 100 is made of a glass material, and the first lens 110, the second lens 120, the third lens 130 and the The fifth lens 150 is made of a plastic material.

In addition, the power ratio of the first lens group G1 is -0.795, the power ratio of the second lens group G2 is set to 0.557, and the power ratio of the third lens group G3 is set to 0.337.

In addition, the focal length of the first lens 110 is -4.4mm, the focal length of the second lens 120 is -179mm, the focal length of the third lens 130 is 5.27mm, and the focal length of the fourth lens 140 is 4.9mm. , the focal length of the fifth lens 150 is designed to be -7.71 mm. Accordingly, the focal length of the first lens group G1 composed of the first lens 110 is set to -4.4 mm, and the second lens group G2 composed of a combination of the second lens 120 and the third lens 130 is set. The combined focal length of ) is set to 6.28 mm, the combined focal length of the third lens group G3 consisting of a combination of the fourth lens 140 and the fifth lens 150 is set to 10.4 mm, and the lens assembly 100 The total effective focal length (EFL) of is set to 3.5 mm.

<Third Embodiment>

The first lens group G1 has a concave entrance surface toward the object side (OS) and a concave exit surface toward the image side (IS), has negative refractive power, and has at least one surface made of an aspherical plastic material. It includes one lens (110).

The second lens group G2 has a convex entrance surface toward the object side (OS) and a convex exit surface toward the image side (IS), has positive refractive power, and at least one surface is an aspheric second lens made of plastic ( 120) and a third lens 130 made of a plastic material having a concave entrance surface toward the object side (OS) and a convex exit surface toward the image side (IS), having positive refractive power, and having at least one surface aspherical, The combined refractive power of the second lens 120 and the third lens 130 is set to have positive refractive power.

The third lens group G3 has a convex entrance surface toward the object side (OS) and a convex exit surface toward the image side (IS), has positive refractive power, and has a spherical entrance surface and an exit surface, respectively, made of glass. 4 lenses 140, a fifth lens 150 made of plastic having a concave entrance surface toward the object side (OS) and a concave exit surface toward the image side (IS), having negative refractive power, and having at least one surface aspherical. The combined refractive power of the fourth lens 140 and the fifth lens 150 is set to have negative refractive power.

An aperture AS may be disposed between the first lens 110 and the second lens 120 .

In the third embodiment, the fourth lens 140 constituting the lens assembly 100 is made of a glass material, and the first lens 110, the second lens 120, the third lens 130 and the The fifth lens 150 is made of a plastic material.

In addition, the power ratio of the first lens group G1 is -0.548, the power ratio of the second lens group G2 is 0.638, and the power ratio of the third lens group G3 is set to -0.175.

In addition, the focal length of the first lens 110 is -6.46mm, the focal length of the second lens 120 is 8.39mm, the focal length of the third lens 130 is 9.66mm, and the focal length of the fourth lens 140 is 7.74mm. , the focal length of the fifth lens 150 is designed to be -5.16 mm. Accordingly, the focal length of the first lens group G1 comprising the first lens 110 is set to -6.46 mm, and the second lens group G2 comprising a combination of the second lens 120 and the third lens 130 is set. The combined focal length of ) is set to 5.55 mm, the combined focal length of the third lens group G3 consisting of a combination of the fourth lens 140 and the fifth lens 150 is set to -20.24 mm, and the lens assembly 100 ), the total effective focal length (EFL) is set to 3.5424 mm.

<The fourth embodiment>

The first lens group G1 has a convex entrance surface toward the object side OS and a concave exit surface toward the image side IS, has negative refractive power, and has at least one surface made of an aspherical plastic material. 1 lens 110, a second lens made of a plastic material having a concave entrance surface toward the object side (OS) and a convex exit surface toward the image side (IS), having positive refractive power, and having at least one surface aspherical ( 120), and the combined refractive power of the first lens 110 and the second lens 120 is set to have negative refractive power.

The second lens group G2 has a convex entrance surface toward the object side (OS) and a convex exit surface toward the image side (IS), has positive refractive power, and has a spherical entrance surface and an exit surface, respectively, made of glass. It includes 3 lenses 130.

The third lens group G3 has a concave entrance surface toward the object side (OS) and a concave exit surface toward the image side (IS), has negative refractive power, and has at least one surface made of an aspherical plastic material. 4 lenses 140, a fifth lens 150 made of plastic, having a convex entrance surface toward the object side (OS) and a convex exit surface toward the image side (IS), having positive refractive power, and having at least one surface aspheric The combined refractive power of the fourth lens 140 and the fifth lens 150 is set to have negative refractive power.

An aperture AS may be disposed between the second lens 120 and the third lens 130 .

In the second embodiment, the third lens 130 constituting the lens assembly 100 is made of a glass material, and the first lens 110, the second lens 120, the fourth lens 140 and the The fifth lens 150 is made of a plastic material.

In addition, the power ratio of the first lens group G1 is -0.102, the power ratio of the second lens group G2 is 0.482, and the power ratio of the third lens group G3 is set to -0.196.

In addition, the focal length of the first lens 110 is -6.56mm, the focal length of the second lens 120 is 21.82mm, the focal length of the third lens 130 is 7.34mm, and the focal length of the fourth lens 140 is -5.06mm. mm, the focal length of the fifth lens 150 is designed to be 5.79 mm. Accordingly, the combined focal length of the first lens group G1 composed of the combination of the first lens 110 and the second lens 120 is set to -34.6 mm, and the second lens group composed of the third lens 130 ( The focal length of G2) is set to 7.34 mm, the combined focal length of the third lens group G3 consisting of the combination of the fourth lens 140 and the fifth lens 150 is set to -18.01 mm, and the lens assembly 100 ), the total effective focal length (EFL) is set to 3.5424 mm.

According to the above embodiments, among the plurality of lenses constituting the lens assembly 100, the third lens 130 or the fourth lens 140 may be made of a glass material, and the remaining lenses may be made of a plastic material. . Here, the third lens 130 or the fourth lens 140 made of a glass material is disposed between the diaphragm AS and the image side IS, and has positive refractive power. The lens assembly 100 that satisfies these conditions can have constant optical characteristics even at high or low temperatures, and can reduce manufacturing costs and reduce weight.

This lens assembly 100 may satisfy the conditional expression below.

[Conditional Expression 1] Gf/f < 3.5

In the above conditional expression, f is the total focal length of the lens assembly 100, and Gf is the focal length of the lens made of glass.

The lens assembly 100 configured as above may have a constant resolution even at high and low temperatures. Therefore, it is possible to provide a clear image to the user even when installed in a place easily exposed to the external environment, such as the front and rear bumpers of a car.

In addition, it is difficult to precisely process an aspherical surface of a lens made of glass. Therefore, in this embodiment, among the plurality of lenses constituting the lens assembly 100, the third lens 130 or the fourth lens 140 made of glass is formed into a spherical surface, and the remaining lenses made of plastic material are made of aspherical surfaces. form In this way, if the remaining lenses made of plastic material are composed of aspherical lenses, Seidel aberrations such as spherical aberration, coma aberration, astigmatism, curvature aberration, and distortion aberration can be effectively reduced, and practical difficulties in implementing an aspheric glass lens can be achieved. can be overcome and the degree of freedom in refractive power design can be secured.

While the lens made of plastic can be easily manufactured as an aspheric lens, there is a problem that an image distorted by a temperature change may be formed. At this time, the third lens 130 or the fourth lens 140 made of a glass material may serve to correct chromatic aberration. That is, lenses made of a plastic material among the plurality of lenses constituting the lens assembly 100 may have a limited Abbe's number design, whereas the third lens 130 or the fourth lens 140 made of a glass material Since has a high degree of freedom in Abbe number design, chromatic aberration can be corrected through the Abbe number design of the third lens 130 or the fourth lens 140. The Abbe number is a number representing the property of light dispersion of optical glass, and the higher the Abbe number, the less chromatic dispersion occurs and a clear image can be obtained.

7 and 8 of the accompanying drawings are graphs showing changes in optical characteristics according to temperature changes of the automobile lens assembly of the present invention, FIG. 9 is a peripheral light ratio graph of the automobile lens assembly of the present invention, and FIG. 10 is a graph of the present invention automobile CRA (Chief Ray Angle; chief ray angle) graph of the lens assembly, FIG. 11 is a distortion graph of the lens assembly for a vehicle according to the present invention.

7 and 8 are graphs showing spatial resolution according to image size for each temperature, amount of defocus according to field input, and MTF value according to field input.

The spatial resolution graph according to image size shows the comparison value for 120 lp/mm vertical and horizontal versus the diffraction limit line, the horizontal axis indicates the image size value, the vertical axis indicates the MTF value, and the graph showing the amount of defocus according to the field input , the horizontal axis is the defocus position, the vertical axis is the MTF value, and the graph showing the MTF values according to the field input, the horizontal axis is the spatial frequency/mm, and the vertical axis is the optical transfer function.

Within the temperature change of -40℃ to 110℃ (reliability specification required by automobile manufacturers), each lens sag change and spacer change according to the expansion coefficient, and the present embodiments maintain MTF performance according to temperature change and minimize defocus change amount The purpose is to show, and according to the simulation results shown in FIGS. 7 and 8, the amount of defocus is within the range of about 10um based on the performance of 25% at MTF 167 lp / mm within -40 ℃ ~ 110 ℃ temperature change can be confirmed to be maintained

Specifically, FIGS. 7 and 8 show a power ratio of the first lens group G1 of -0.874 to -0.092, a power ratio of the second lens group G2 of 0.434 to 0.702, and a power ratio of the third lens group G3. With the ratio set in the range of -0.216 to 0.370, the optical properties according to the temperature change are shown. -6.1um at MTF (0 ~ 0.85F), 45% on 120 lp/mm, 31% on 167 lp/mm, and 38% on 120 lp/mm at MTF (-40 ~ 110℃) , 19% on 167 lp/m.

That is, the power ratio setting range of the first lens group (G1), second lens group (G2), and third lens group (G3) of the present invention is about 10um in the amount of defocus within the temperature change of -40 ℃ ~ 110 ℃. It is intended to be kept within the range, and if it is out of this setting range, it can be seen that the amount of defocus, which is one of the reliability specifications required by automobile manufacturers, will exceed about 10um.

On the other hand, within the power ratio setting range of this embodiment, the ambient light ratio is 89.8% as shown in FIG. 9, the chief ray angle (CRA) is 18.14° as shown in FIG. 10, and the distortion index is -19.6% as shown in FIG. 11. can be seen to appear.

In this way, the lens assembly according to the present embodiment is composed of a total of 5 lenses and limits the use of a glass lens to 1 sheet to reduce the manufacturing cost, realizes wide-angle high resolution and guarantees resolution even in a wide range of temperature changes. There are advantages to doing so.

The scope of the present invention is not limited to the above-described embodiments, but may be implemented in various forms of embodiments within the scope of the appended claims. Anyone with ordinary knowledge in the art to which the invention pertains without departing from the subject matter of the invention claimed in the claims is considered to be within the scope of the claims of the present invention to various extents that can be modified.

100: lens assembly, G1: first lens group, G2: second lens group,
G3: 3rd lens group, 110: 1st lens, 120: 2nd lens,
130: 3rd lens, 140: 4th lens, 150: 5th lens,
AS: aperture, OF: optical filter

Claims (8)

delete delete Including a first lens group, a second lens group, and a third lens group disposed in order from the object side toward the image side,
The first lens group has negative refractive power, the second lens group has positive refractive power, and the third lens group has positive or negative refractive power;
The first lens group includes lenses made of plastic, and the second or third lens group includes lenses made of glass;
The power ratio of the first lens group is -0.874 to -0.092, the power ratio of the second lens group is 0.434 to 0.702, and the power ratio of the third lens group is set to a range of -0.216 to 0.370;
The first lens group includes a first lens, the second lens group includes a second lens and a third lens, and the third lens group includes a fourth lens and a fifth lens;
The lens assembly for a vehicle, characterized in that the fourth lens is made of a glass material, and the first lens, second lens, third lens and fifth lens are made of a plastic material. Including a first lens group, a second lens group, and a third lens group disposed in order from the object side toward the image side,
The first lens group has negative refractive power, the second lens group has positive refractive power, and the third lens group has positive or negative refractive power;
The first lens group includes lenses made of plastic, and the second or third lens group includes lenses made of glass;
The power ratio of the first lens group is -0.874 to -0.092, the power ratio of the second lens group is 0.434 to 0.702, and the power ratio of the third lens group is set to a range of -0.216 to 0.370;
The first lens group includes a first lens and a second lens, the second lens group includes a third lens, and the third lens group includes a fourth lens and a fifth lens;
The lens assembly for a vehicle, characterized in that the third lens is made of a glass material, and the first lens, second lens, fourth lens and fifth lens are made of a plastic material. According to claim 3 or 4,
The first lens group,
A lens assembly for a vehicle, comprising: a first lens made of a plastic material having negative refractive power, being convex or concave toward an object, and having at least one surface aspherical. According to claim 5,
The second lens group,
a second lens made of plastic, having positive or negative refractive power, being concave or convex toward the object, and having at least one surface aspheric; and
A lens assembly for a vehicle, characterized in that it comprises a third lens made of plastic material or glass material having a positive refractive power and having a biconvex or meniscus shape. According to claim 6,
The third lens group includes a fourth lens having positive or negative refractive power, having a double-sided convex or concave shape, and made of plastic or glass. According to claim 7,
The third lens group further comprises a fifth lens made of a plastic material having positive or negative refractive power and at least one surface of which is an aspheric surface.

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