TWM632271U - Eight-piece vehicle lens module - Google Patents

Abstract

This creation provides an eight-piece vehicle lens module, which includes eight lenses, the first lens has negative refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, and the fifth lens has positive refractive power. It has positive refractive power, the sixth lens has positive refractive power, the seventh lens has negative refractive power, and the eighth lens has positive refractive power, which can reduce aberrations, realize a large aperture, and take into account the imaging quality of the car lens module.

Description

Eight-piece car lens module

This creation relates to a lens module, especially an eight-piece automotive lens module that can reduce aberrations.

With the increasing popularity of advanced driver assistance systems (ADAS) in cars and the future trend of autonomous driving, the quality of automotive lens modules is more important, and this is the goal of this creation. One is to provide a vehicle lens module capable of reducing aberrations and achieving high imaging quality.

In order to solve the above problems, the present invention discloses an eight-piece automotive lens module, which can reduce aberrations, achieve a large aperture, and take into account the imaging quality by the surface configuration of the eight lenses.

In order to achieve the above purpose, the present invention provides an eight-piece vehicle lens module in one embodiment, which includes eight lenses, and the eight lenses sequentially include a first lens along an optical axis from an object side to an image side. A lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, and the eight lenses respectively have object sides facing the object side And the image side facing the image side, the first lens has negative refractive power, the object side of the first lens is convex at the near optical axis, and its image side is concave; the second lens has negative refractive power, and the object side of the second lens is low beam The shaft is concave; The three lenses have positive refractive power, the image side of the third lens is convex at the near optical axis; the fourth lens has positive refractive power, and the object side of the fourth lens is convex at the near optical axis; the object side of the fifth lens and the image side low beam The axis is convex; the object side and the image side of the sixth lens are convex at the near optical axis; the seventh lens is concave at the object side and the near optical axis of the image side; the eighth lens has positive refractive power, and the eighth lens has a positive refractive power. The object side near the optical axis is convex.

In another embodiment of the present invention, the focal length of the first lens is F1, the focal length of the second lens is F2, and the distance between the first lens and the second lens on the optical axis is T2, which satisfies the following conditional formula: 21< F1*F2/T2<31. Thereby, the viewing angle of the whole lens module can be increased.

In another embodiment of the present invention, the Abbe number of the sixth lens is V6, and the Abbe number of the seventh lens is V7, which satisfy the following conditional formula: 2.9<V6/V7<3.4. Thereby, the materials of the sixth lens and the seventh lens are matched to correct the system chromatic aberration.

In another embodiment of the present invention, the focal length of the third lens is F3, the radius of curvature of the image side of the third lens is R6, the focal length of the fourth lens is F4, and the radius of curvature of the object side of the fourth lens is R7. The following conditional formula is satisfied: -22<(R6*R7)/(F3+F4)<-7. The deflection of light is slowed down by the combination of the refractive power of the third lens and the fourth lens.

In another embodiment of the present invention, the curvature radius of the object side surface of the eighth lens is R15, the curvature radius of the image side surface is R16, and the focal length of the eighth lens is F8, which satisfies the following conditional formula: -0.5<|( (R15*R16)/F8)/10000|<9. Thereby, the astigmatism of the surface shape correction system of the eighth lens is controlled.

In another embodiment of this invention, the radius of curvature of the image side of the fourth lens is R8, the radius of curvature of the object side of the fifth lens is R9, and the thickness of the image side of the fourth lens is T8, which satisfy the following conditional formula: : -5.6<((R8*R9)T8)/1000<1.1. The spherical aberration of the system is corrected by the surface shape matching of the fourth lens and the fifth lens.

In another embodiment of the present invention, the curvature radius of the object side of the sixth lens is R11, the curvature radius of the image side is R12, the curvature radius of the seventh lens is R13, and the curvature radius of the image side is R13. R14, which satisfies the following conditional formula: 0<(R11+R12)/(R13+R14)<1. Thereby, the surface shape relationship between the sixth lens and the seventh lens is controlled to achieve an appropriate back focus distance.

In another embodiment of the present invention, the sixth lens and the seventh lens are glued to each other. This contributes to achromatic aberration and shortens the overall length of the system.

In another embodiment of the present invention, the object side surface and the image side surface of the eight lenses are spherical surfaces, and they are all made of glass. Thereby, environmental reliability requirements can be increased.

100: Eight-piece car lens module

A: Object side

B: Image side

L: optical axis

10: The first lens

11: Object side

12: Like the side

20: Second lens

21: Object side

22: Like a profile

30: Third lens

31: Object side

32: Like a profile

40: Fourth lens

41: Object side

42: Like a profile

50: Fifth lens

51: Object side

52: Like a profile

60: sixth lens

61: Object side

62: Like a profile

70: seventh lens

71: Object side

72: Like a profile

80: Eighth lens

81: Object side

82: Like a profile

S: Aperture

90: Filter

91: Object side

92: Like a profile

C: Imaging plane

100a: Eight-piece car lens module

100b: Eight-piece car lens module

100c: Eight-piece car lens module

[Fig. 1] is a schematic diagram of the first embodiment of the eight-piece vehicle lens module created by the present invention.

[FIG. 2A] is a field curve diagram of the first embodiment of the eight-piece automotive lens module created by the present invention.

[FIG. 2B] It is a distortion curve diagram of the first embodiment of the eight-piece automotive lens module created by the present invention.

[Fig. 3] is a schematic diagram of the second embodiment of the eight-piece vehicle lens module created by the present invention.

[FIG. 4A] It is a field curve diagram of the second embodiment of the eight-piece automotive lens module created by the present invention.

[FIG. 4B] It is a distortion curve diagram of the second embodiment of the eight-piece automotive lens module created by the present invention.

[Fig. 5] is a schematic diagram of the third embodiment of the eight-piece vehicle lens module created by the present invention.

[FIG. 6A] It is a field curve diagram of the third embodiment of the eight-piece automotive lens module created by the present invention.

[FIG. 6B] It is a distortion curve diagram of the third embodiment of the eight-piece automotive lens module created by the present invention.

[Fig. 7] is a schematic diagram of the fourth embodiment of the eight-piece vehicle lens module created by the present invention.

FIG. 8A is a field curve diagram of the fourth embodiment of the eight-piece automotive lens module created by the present invention.

[FIG. 8B] It is a distortion curve diagram of the fourth embodiment of the eight-piece vehicle lens module created by the present invention.

In order to facilitate the description of the central idea expressed in the above-mentioned column of creative content of this creation, specific embodiments are used to express it. Various objects in the embodiments are drawn according to the scale suitable for enumeration and description, rather than the scale of the actual elements, and will be described together first.

Please refer to FIG. 1 , which is a first embodiment of an eight-piece vehicle lens module 100 created for this purpose. The eight-piece vehicle lens module 100 includes eight lenses, and the eight lenses are along an optical axis L. From an object side A to an image side B, it includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a The seventh lens 70, an eighth lens 80 and a filter 90, the eight lenses and the filter 90 respectively have an object side facing the object side A and an image side facing the image side B, and the image of the filter 90 is The side surface 92 further has an imaging surface C, and an aperture S is disposed between the third lens 30 and the fourth lens 40 . Wherein, the object side surface and the image side surface of the eight lenses are spherical surfaces, and they are all made of glass, so as to improve the requirements of environmental reliability.

The first lens 10 has negative refractive power, the object side 11 of the first lens 10 is convex at the near optical axis L, and the image side 12 thereof is concave. The first lens 10 can increase the maximum viewing angle FOV of the lens module.

The second lens 20 has negative refractive power, and the object side surface 21 of the second lens 20 is concave at the near optical axis, and the image side 22 is concave at the near optical axis L. Distortion can be corrected by the combination of the second lens 20 and the first lens 10 .

The third lens 30 has positive refractive power. The object side 31 of the third lens 30 is convex at the near optical axis L, and the image side 32 near the optical axis L is convex. Through the matching of the third lens 30 and the second lens 20 It can make the light path smooth.

The fourth lens 40 has positive refractive power, the object side 41 of the fourth lens 40 is convex at the near optical axis L, and the image side 42 near the optical axis L is convex. In this creative embodiment, the fourth lens 40 is made of glass with a high refractive index, which can balance aberrations.

The fifth lens 50 has positive refractive power, and both the object side surface 51 and the image side surface 52 near the optical axis L are convex surfaces. Since the image side surface 52 is convex, aberrations can be balanced.

The sixth lens 60 has positive refractive power, and both the object side surface 61 and the image side surface 62 at the near optical axis L are convex, so as to shorten the total length of the lens module.

The seventh lens 70 has negative refractive power, and both the object side 71 and the image side 72 near the optical axis L are concave. In this creative embodiment, the sixth lens 60 and the seventh lens 70 are glued to each other, and the combination of the two can reduce chromatic aberration.

The eighth lens 80 has positive refractive power. The object side 81 of the eighth lens 80 is convex near the optical axis L, and the image side 82 near the optical axis L is concave, so as to shorten the overall length of the lens module and make it miniaturized. In addition, in other embodiments, the seventh lens 70 and the eighth lens 80 are glued to each other, which helps to eliminate chromatic aberration and shorten the total length of the system.

Next, please refer to Table 1, which are the design parameter values of the eight-piece automotive lens module 100 in this embodiment, wherein the numbers 1 to 18 in Table 1 represent the surfaces of each element in sequence, and the odd numbers is the object side facing the object side A, the even number is the image side facing the image side B, and the thickness of the object side represents the thickness of each lens, the thickness of the image side represents when each lens is connected to the next lens or the next aperture. The spacing on the optical axis L is also the same in the following embodiments, and will not be repeated:

According to the aforementioned Table 1, the values of the relational expressions in Table 2 can be further obtained, wherein T1 to T16 represent the thickness of each lens and the distance between each lens, F is the effective focal length of the system, f1 to f8 represent the focal length of each lens, and R1 to R16 represent the focal length of each lens. The radius of curvature of each surface of each lens, TTL represents the total length of the optical system, ATL represents the total thickness of all lenses, Gaa represents the total distance of the optical axis gap (excluding the last lens), which is also expressed in the same way in the following examples, Without repeating it:

According to the values in Tables 1 and 2, this embodiment also satisfies the following conditional formula, 21<F1*F2/T2<31. Wherein, T2 is the distance on the optical axis L between the first lens 10 and the second lens 20 . Thereby, the viewing angle of the whole lens module can be increased.

In this embodiment, the system chromatic aberration is corrected through the material matching of the sixth lens 60 and the seventh lens 70, and further satisfies the following conditional formula, 2.9<V6/V7<3.4. Wherein, V6 is the Abbe number of the sixth lens 60 , and V7 is the Abbe number of the seventh lens 70 .

In this embodiment, the following conditional formula is also satisfied, -22<(R6*R7)/(F3+F4)<-7, and the deflection of light is slowed down by the combination of the refractive power of the third lens 30 and the fourth lens 40 .

In this embodiment, the following conditional expression is also satisfied, -0.5<|((R15*R16)/F8)/10000|<9. Thereby, the astigmatism of the surface correction system of the eighth lens 80 is controlled.

In this embodiment, the following conditional formula is also satisfied, -5.6<((R8*R9)/T8)/1000<1.1. That Among them, T8 is the distance between the fourth mirror 40 and the fifth mirror 50 on the optical axis L. The spherical aberration of the system is corrected by matching the surface shapes of the fourth lens 40 and the fifth lens 50 .

In this embodiment, the following conditional formula is also satisfied, 0<(R11+R12)/(R13+R14)<1. Thereby, the surface shape relationship between the sixth lens 60 and the seventh lens 70 is controlled to achieve an appropriate back focus distance.

Please refer to FIG. 2A and FIG. 2B , which are field curvature diagrams and distortion curve diagrams of the first embodiment. Accordingly, in this embodiment, the aperture S is used to separate the two lens groups, which can reduce aberrations, achieve a large aperture, and take into account the quality of imaging, which is beneficial to be used in automotive lens modules.

Please refer to FIGS. 3 to 4A and 4B, which are the second embodiment of the present invention, and FIG. 3 is a schematic diagram of the second embodiment of the eight-piece vehicle lens module 100a. FIG. 4A and FIG. 4B are the field curvature diagram and the distortion curve diagram of the second embodiment, respectively. The configuration of the second embodiment is roughly the same as that of the first embodiment, except that the maximum viewing angle FOV of the eight-piece vehicle lens module 100a is 122.5 degrees, the system focal length FFL is 4.869 mm, and the entrance pupil aperture EPD is 3.04248 mm. The image height IMGH is 5.0935mm.

Next, please refer to Table 3, which is the design parameter values of the eight-piece vehicle lens module 100a in the second embodiment:

According to the aforementioned Table 3, the values of the relational expressions in Table 4 can be further obtained:

According to the aforementioned conditions, the second embodiment of the present invention also has the effect of the first embodiment.

Please refer to FIGS. 5 to 6A and 6B, which are the third embodiment of the present invention, and FIG. 5 is a schematic diagram of the third embodiment of the eight-piece vehicle lens module 100b. FIG. 6A and FIG. 6B are the field curvature diagram and the distortion curve diagram of the third embodiment, respectively. The configuration of the third embodiment is roughly the same as that of the second embodiment, except that the maximum viewing angle FOV of the eight-piece vehicle lens module 100b is 123.5 degrees, the system focal length FFL is 5.009 mm, and the entrance pupil aperture EPD is 3.111 mm.

Next, please refer to Table 5, which are the design parameter values of the eight-piece vehicle lens module 100b in the third embodiment:

According to the aforementioned Table 5, the values of the relational expressions in Table 6 can be further obtained:

According to the aforementioned conditions, the third embodiment of the present invention also has the effect of the first embodiment.

Please refer to FIGS. 7 to 8A and 8B, which are the fourth embodiment of the present invention, and FIG. 7 is a schematic diagram of the fourth embodiment of the eight-piece vehicle lens module 100c. FIG. 8A and FIG. 8B are the field curvature diagram and the distortion curve diagram of the fourth embodiment, respectively. The configuration of the fourth embodiment is roughly the same as that of the second embodiment, and the difference lies in: The maximum viewing angle FOV of the eight-piece automotive lens module 100c is 126.7 degrees, the system focal length FFL is 5.148mm, and the entrance pupil aperture EPD is 3.218mm.

Next, please refer to Table 7, which are the design parameter values of the eight-piece vehicle lens module 100c in the fourth embodiment:

According to the aforementioned Table 7, the values of the relational expressions in Table 8 can be further obtained:

According to the aforementioned conditions, the fourth embodiment of the present invention also has the effect of the first embodiment.

To sum up the above, in this creation, the aperture S is used to separate two lens groups. The front group includes the first lens 10, the second lens 20 and the third lens 30, and the rear group includes the fourth lens 40, the fifth lens 50, and the sixth lens 60. The seventh lens 70 and the eighth lens 80 can reduce aberrations, achieve a large aperture, and take into account the quality of imaging, which is beneficial to be used in automotive lens modules.

Although the present invention is described as a preferred embodiment, those skilled in the art can make various changes without departing from the spirit and scope of the present invention. The above-mentioned embodiments are only used to illustrate the present creation, and are not intended to limit the scope of the present creation. All kinds of modifications or changes that do not violate the spirit of this creation belong to the scope of the patent application for this creation.

100: Eight-piece car lens module

A: Object side

B: Image side

L: optical axis

10: The first lens

11: Object side

12: Like the side

20: Second lens

21: Object side

22: Like a profile

30: Third lens

31: Object side

32: Like a profile

40: Fourth lens

41: Object side

42: Like a profile

50: Fifth lens

51: Object side

52: Like a profile

60: sixth lens

61: Object side

62: Like a profile

70: seventh lens

71: Object side

72: Like a profile

80: Eighth lens

81: Object side

82: Like a profile

S: Aperture

90: Filter

91: Object side

92: Like a profile

C: Imaging plane

Claims (10)

An eight-piece vehicle lens module, comprising eight lenses, the eight lenses along an optical axis from an object side to an image side in sequence including a first lens, a second lens, a third lens, A fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, and the eight lenses respectively have an object side facing the object side and an image side facing the image side, wherein: The first lens has negative refractive power, the object side of the first lens is convex near the optical axis, and the image side is concave; the second lens has negative refractive power, and the object side of the second lens is near the optical axis. is concave; the third lens has positive refractive power, and the image side of the third lens is convex near the optical axis; the fourth lens has positive refractive power, and the object side of the fourth lens is convex near the optical axis; the The object side and the image side of the fifth lens are both convex surfaces near the optical axis; the object side and the image side of the sixth lens are convex near the optical axis; the object side and the image side of the seventh lens are convex The axes are all concave; and the eighth lens has positive refractive power, and the object side of the eighth lens is convex near the optical axis. The eight-piece vehicle lens module according to claim 1, wherein the focal length of the first lens is F1, the focal length of the second lens is F2, and the first lens and the second lens are on the optical axis The spacing above is T2, which satisfies the following conditional formula: 21<F1*F2/T2<31. The eight-piece vehicle lens module according to claim 1, wherein the Abbe number of the sixth lens is V6, and the Abbe number of the seventh lens is V7, which satisfy the following conditional formula: 2.9<V6/ V7<3.4. The eight-piece vehicle lens module according to claim 1, wherein the focus of the third lens is The distance is F3, the radius of curvature of the image side of the third lens is R6, the focal length of the fourth lens is F4, and the radius of curvature of the object side of the fourth lens is R7, which satisfies the following conditional formula: -22<(R6 *R7)/(F3+F4)<-7. The eight-piece vehicle lens module according to claim 1, wherein the curvature radius of the object side surface of the eighth lens is R15, the curvature radius of the image side surface is R16, and the focal length of the eighth lens is F8, It satisfies the following conditional formula: -0.5<|((R15*R16)/F8)/10000|<9. The eight-piece vehicle lens module according to claim 1, wherein the curvature radius of the image side surface of the fourth lens is R8, the curvature radius of the object side surface of the fifth lens is R9, and the fourth lens has a curvature radius of R8. The thickness of the image side is T8, which satisfies the following conditional formula: -5.6<((R8*R9)T8)/1000<1.1. The eight-piece vehicle lens module according to claim 1, wherein the curvature radius of the object side surface of the sixth lens is R11, the curvature radius of the image side surface is R12, and the curvature radius of the object side surface of the seventh lens is R12. is R13, and the curvature radius of the image side surface is R14, which satisfies the following conditional formula: 0<(R11+R12)/(R13+R14)<1. The eight-piece vehicle lens module according to claim 1, wherein the sixth lens and the seventh lens are glued to each other. The eight-piece vehicle lens module according to claim 1, wherein the object side surface and the image side surface of the eight-piece lens are spherical surfaces, and both are made of glass. The eight-piece vehicle lens module according to claim 1, further comprising an aperture disposed between the third lens and the fourth lens.

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