TW201730619A - Wide-angle lens - Google Patents

Abstract

A wide-angle lens includes 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, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is a convex-concave lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens is a biconcave lens with negative refractive power. The third lens is a biconvex lens with positive refractive power. The fourth lens includes a convex surface facing the object side. The fifth lens is with positive refractive power and includes a convex surface facing the image side. The sixth lens is a biconvex lens with positive refractive power. The seventh lens is a biconcave lens with negative refractive power. The eighth lens is a biconvex lens with positive refractive power.

Description

Wide-angle lens

The present invention relates to a wide-angle lens.

The development trend of today's wide-angle lens, in addition to the continuous development towards miniaturization and wide viewing angle, with the need of high resolution and resistance to environmental temperature changes with different application requirements, the conventional wide-angle lens can no longer meet the needs of today. Demand, there needs to be another wide-angle lens with a new architecture to meet the needs of miniaturization, wide viewing angle, high resolution and resistance to ambient temperature changes.

In view of this, the main object of the present invention is to provide a wide-angle lens with a short total lens length, a large viewing angle, and resistance to environmental temperature changes, but still has good optical performance, and the lens resolution can also meet the requirements.

The wide-angle lens of the present invention sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and an image from an object side to an image side along an optical axis. a seventh lens and an eighth lens. The first lens has a convex-concave lens having a negative refractive power, and the convex surface of the first lens faces the object side concave surface toward the image side. The second lens is a biconcave lens having a negative refractive power. The third lens is a lenticular lens having a positive refractive power. The fourth lens includes a convex surface that faces the object side. The fifth lens has a positive refractive power and includes a convex surface that faces the image side. The sixth lens is a lenticular lens having a positive refractive power. The seventh lens is a biconcave lens having a negative refractive power. The eighth lens is a lenticular lens having a positive refractive power.

The fourth lens and the fifth lens glue are combined into a cemented lens.

The sixth lens and the seventh lens glue are combined into a cemented lens.

Wherein the seventh lens satisfies the following condition: -110 (R ₇₁ -R ₇₂ )/(R ₇₁ +R ₇₂ ) -1; wherein R ₇₁ is the radius of curvature of the side surface of the seventh lens, and R ₇₂ is the radius of curvature of the image side of the seventh lens.

The fourth lens satisfies the following conditions: -20 f ₄ /f 20; wherein f ₄ is the effective focal length of the fourth lens, and f is the effective focal length of the wide-angle lens.

The sixth lens and the seventh lens satisfy the following conditions: -30 f ₆₇ /f -5; wherein f ₆₇ is the effective focal length of the sixth lens and the seventh lens glue to form a cemented lens, and f is the effective focal length of the wide-angle lens.

The fourth lens satisfies the following conditions: 5 Vd ₄ /Nd ₄ 50; wherein Vd ₄ is the Abbe coefficient of the fourth lens, and Nd ₄ is the refractive index of the fourth lens.

The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are made of a glass material.

At least one of each of the second lens and the eighth lens is an aspherical surface.

The wide-angle lens of the present invention may further include an aperture disposed between the third lens and the fourth lens.

The above described objects, features, and advantages of the invention will be apparent from the description and appended claims

1, 2, 3‧‧‧ wide-angle lens

L11, L21, L31‧‧‧ first lens

L12, L22, L32‧‧‧ second lens

L13, L23, L33‧‧‧ third lens

L14, L24, L34‧‧‧ fourth lens

L15, L25, L35‧‧‧ fifth lens

L16, L26, L36‧‧‧ sixth lens

L17, L27, L37‧‧‧ seventh lens

L18, L28, L38‧‧‧ eighth lens

ST1, ST2, ST3‧‧ ‧ aperture

OF1, OF2, OF3‧‧‧ Filters

IMA1, IMA2, IMA3‧‧‧ imaging surface

OA1, OA2, OA3‧‧‧ optical axis

S11, S12, S13, S14, S15, S16, S17‧‧

S18, S19, S110, S111, S112, S113‧‧‧

S114, S115, S116, S117‧‧‧

S21, S22, S23, S24, S25, S26, S27‧‧

S28, S29, S210, S211, S212, S213‧‧‧

S214, S215, S216, S217‧‧‧

S31, S32, S33, S34, S35, S36, S37‧‧

S38, S39, S310, S311, S312, S313‧‧

S314, S315, S316, S317‧‧‧

1 is a schematic view showing a lens configuration and an optical path of a first embodiment of a wide-angle lens according to the present invention.

Fig. 2A is a longitudinal spherical aberration diagram of the wide-angle lens of Fig. 1.

Fig. 2B is an astigmatic field curvature diagram of the wide-angle lens of Fig. 1.

Fig. 2C is a distortion diagram of the wide-angle lens of Fig. 1.

Fig. 3 is a view showing a lens configuration and an optical path of a second embodiment of the wide-angle lens according to the present invention.

Fig. 4A is a longitudinal spherical aberration diagram of the wide-angle lens of Fig. 3.

Fig. 4B is an astigmatic field curvature diagram of the wide-angle lens of Fig. 3.

Figure 4C is a distortion diagram of the wide-angle lens of Figure 3.

Fig. 5 is a view showing a lens configuration and an optical path of a third embodiment of the wide-angle lens according to the present invention.

Fig. 6A is a longitudinal spherical aberration diagram of the wide-angle lens of Fig. 5.

Fig. 6B is an astigmatic field curvature diagram of the wide-angle lens of Fig. 5.

Fig. 6C is a distortion diagram of the wide-angle lens of Fig. 5.

Please refer to FIG. 1. FIG. 1 is a schematic diagram showing a lens configuration and an optical path of a first embodiment of a wide-angle lens according to the present invention. The wide-angle lens 1 sequentially includes a first lens L11, a second lens L12, a third lens L13, an aperture ST1, a fourth lens L14, and a fifth from an object side to an image side along an optical axis OA1. The lens L15, a sixth lens L16, a seventh lens L17, an eighth lens L18, and a filter OF1. At the time of imaging, the light from the object side is finally imaged on an image plane IMA1. The first lens L11 is a convex-concave lens having a negative refractive power made of a glass material, the object side surface S11 is a convex surface, the image side surface S12 is a concave surface, and the object side surface S11 and the image side surface S12 are spherical surfaces. The second lens L12 is a biconcave lens having a negative refractive power made of a glass material, the object side surface S13 being an aspherical surface, and the image side surface S14 being an aspherical surface. The third lens L13 is a lenticular lens having a positive refractive power made of a glass material, and the object side surface S15 is a spherical surface, and the image side surface S16 It is a spherical surface. The fourth lens L14 is a convex-concave lens having a negative refractive power made of a glass material, and the object side surface S18 has a convex image side surface S19 as a concave surface, and the object side surface S18 and the image side surface S19 are spherical surfaces. The fifth lens L15 is a lenticular lens having a positive refractive power made of a glass material, and both the object side surface S19 and the image side surface S110 are spherical surfaces. The fourth lens L14 and the fifth lens L15 are glued to form a cemented lens. The sixth lens L16 is a lenticular lens having a positive refractive power made of a glass material, and both the object side surface S111 and the image side surface S112 are spherical surfaces. The seventh lens L17 is a biconcave lens having a negative refractive power and is made of a glass material, and both the object side surface S112 and the image side surface S113 are spherical surfaces. The sixth lens L16 and the seventh lens L17 are glued to form a cemented lens. The eighth lens L18 is a lenticular lens having a positive refractive power made of a glass material, and both the object side surface S114 and the image side surface S115 are aspherical surfaces. The filter OF1 has a flat surface S116 and an image side surface S117.

In addition, in order to maintain good optical performance of the wide-angle lens of the present invention, the wide-angle lens 1 of the first embodiment is required to satisfy the following four conditions:

Wherein, R1 ₇₁ is the radius of curvature of the object side surface S112 of the seventh lens L17, R1 ₇₂ is the radius of curvature of the image side surface S113 of the seventh lens L17, f1 ₄ is the effective focal length of the fourth lens L14, and f1 is the effective focal length of the wide-angle lens 1. F1 ₆₇ is an effective focal length of the cementation lens of the sixth lens L16 and the seventh lens L17, Vd1 ₄ is the Abbe coefficient of the fourth lens L14, and Nd1 ₄ is the refractive index of the fourth lens L14.

By adopting the above-mentioned design of the lens and the aperture ST1, the wide-angle lens 1 can effectively shorten the total length of the lens, improve the viewing angle, effectively correct the aberration, improve the resolution of the lens, and reduce the influence of the temperature change on the resolution of the lens.

Table 1 is the relevant parameter table of each lens of the wide-angle lens 1 in Fig. 1. Table 1 shows that the effective focal length of the wide-angle lens 1 of the first embodiment is equal to 1.8288 mm, the aperture value is equal to 2.0, the viewing angle is equal to 174.3°, and the total length of the lens is equal to 17.625mm.

The aspherical surface depression z of each lens in Table 1 is obtained by the following formula: z = ch ² /{1 + [1 - (k + 1) c ² h ² ] ^1/2 } + Ah ⁴ + Bh ⁶ + Ch ⁸ +Dh ¹⁰

Where: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~D: aspheric coefficient.

Table 2 is a table of related parameters of the aspherical surface of each lens in Table 1, where k is a conical coefficient (Conic Constant) and A~D is an aspherical coefficient.

In the wide-angle lens 1 of the first embodiment, the radius of curvature R1 _{71 of the} object lens S11 of the seventh lens L17 is -3.32024 mm, and the radius of curvature R1 ₇₂ of the image side surface S113 of the seventh lens L17 is 7.62421 mm, and the fourth lens L14 is effective. The focal length f1 ₄ =-8.6650mm, the effective focal length of the wide-angle lens 1 is f1=1.8288mm, and the effective focal length f1 _{67 of the} second lens L16 and the seventh lens L17 is -15.24650mm, and the Abbe coefficient of the fourth lens L14 Vd1 ₄ = 58.6, and the refractive index of the fourth lens L14 is Nd1 ₄ = 1.652. From the above data, (R1 _{71 -} R1 ₇₂ ) / (R1 ₇₁ + R1 ₇₂ ) = -2.543, f1 ₄ / f1 = - 4.738, f1 ₆₇ /f1=-8.337, Vd1 ₄ /Nd1 ₄ =35.451, all of which can meet the requirements of the above conditions (1) to (4).

In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also be achieved, which can be seen from the 2A to 2C drawings. Fig. 2A is a longitudinal Spherical Aberration diagram of the wide-angle lens 1 of the first embodiment. Fig. 2B is an astigmatism field curve diagram of the wide-angle lens 1 of the first embodiment. Fig. 2C is a distortion diagram of the wide-angle lens 1 of the first embodiment.

As can be seen from FIG. 2A, the wide-angle lens 1 of the first embodiment produces a longitudinal spherical difference between -0.02 mm and 0.00 mm for light having a wavelength of 436.000 nm, 546.000 nm, and 656.000 nm. As can be seen from FIG. 2B, the wide-angle lens 1 of the first embodiment has a astigmatic field curvature between -0.13 mm and 0.02 mm in the direction of the tangential direction and the sagittal direction for the light having a wavelength of 546.000 nm. . As can be seen from FIG. 2C, the wide-angle lens 1 of the first embodiment produces a distortion of between -100% and 0% for light having a wavelength of 546.000 nm. It can be seen that the longitudinal spherical aberration, the astigmatic field curvature, and the distortion of the wide-angle lens 1 of the first embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 3, which is a second embodiment of the wide-angle lens according to the present invention. A schematic diagram of the lens configuration and optical path of the embodiment. The wide-angle lens 2 sequentially includes a first lens L21, a second lens L22, a third lens L23, an aperture ST2, a fourth lens L24, and a fifth from an object side to an image side along an optical axis OA2. The lens L25, a sixth lens L26, a seventh lens L27, an eighth lens L28, and a filter OF2. At the time of imaging, the light from the object side is finally imaged on an image plane IMA2. The first lens L21 is a convex-concave lens having a negative refractive power made of a glass material, the object side surface S21 is a convex surface, the image side surface S22 is a concave surface, and the object side surface S21 and the image side surface S22 are spherical surfaces. The second lens L22 is a biconcave lens having a negative refractive power made of a glass material, the object side surface S23 being an aspherical surface, and the image side surface S24 being an aspherical surface. The third lens L23 is a lenticular lens having a positive refractive power made of a glass material, the object side surface S25 being a spherical surface, and the image side surface S26 being a spherical surface. The fourth lens L24 is a lenticular lens having a positive refractive power made of a glass material, and both the object side surface S28 and the image side surface S29 are spherical surfaces. The fifth lens L25 is a meniscus lens having a positive refractive power made of a glass material, and both the object side surface S29 and the image side surface S210 are spherical surfaces. The fourth lens L24 and the fifth lens L25 are glued to form a cemented lens. The sixth lens L26 is a lenticular lens having a positive refractive power made of a glass material, and both the object side surface S211 and the image side surface S212 are spherical surfaces. The seventh lens L27 is a biconcave lens having a negative refractive power made of a glass material, and both the object side surface S212 and the image side surface S213 are spherical surfaces. The sixth lens L26 and the seventh lens L27 are glued to form a cemented lens. The eighth lens L28 is a lenticular lens having a positive refractive power made of a glass material, and both the object side surface S214 and the image side surface S215 are aspherical surfaces. The filter side OF2 has a flat surface S216 and an image side surface S217.

In addition, in order to maintain good optical performance of the wide-angle lens of the present invention, the wide-angle lens 2 of the second embodiment is required to satisfy the following four conditions:

Wherein, R2 ₇₁ is the radius of curvature of the object side surface S212 of the seventh lens L27, R2 ₇₂ is the radius of curvature of the image side surface S213 of the seventh lens L27, f2 ₄ is the effective focal length of the fourth lens L24, and f2 is the effective focal length of the wide-angle lens 2. , f2 ₆₇ synthesis effective focal length of a lens of the cemented lens L26 to the sixth and the seventh lens L27 gum, Vd2 ₄ Abbe number of the fourth lens L24 of, Nd2 ₄ is the refractive index of the fourth lens L24.

By using the above-mentioned lens and aperture ST2 design, the wide-angle lens 2 can effectively shorten the total length of the lens, improve the viewing angle, effectively correct the aberration, improve the lens resolution, and reduce the influence of temperature changes on the lens resolution.

Table 3 is the relevant parameter table of each lens of the wide-angle lens 2 in FIG. 3, and Table 3 shows that the effective focal length of the wide-angle lens 2 of the second embodiment is equal to 1.8287 mm, the aperture value is equal to 2.0, the viewing angle is equal to 173.9°, and the total length of the lens is equal to 18.000mm.

The aspherical surface depression z of each lens in Table 3 is obtained by the following formula: z = ch ² /{1 + [1 - (k + 1) c ² h ² ] ^1/2 } + Ah ⁴ + Bh ⁶ + Ch ⁸ +Dh ¹⁰

Where: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~D: aspheric coefficient.

Table 4 is the relevant parameter table of the aspherical surface of each lens in Table 3, where k is a conical coefficient (Conic Constant) and A~D is an aspherical coefficient.

In the wide-angle lens 2 of the second embodiment, the curvature radius R2 ₇₁ of the object lens side S212 of the seventh lens L27 is -3.07642 mm, and the curvature radius R2 ₇₂ of the image side surface S213 of the seventh lens L27 is 4.61793 mm, and the fourth lens L24 is effective. The focal length f2 _{4 is} =16.2755mm, the effective focal length of the wide-angle lens 2 is f2=1.8287mm, the effective focal length of the cementation lens of the sixth lens L26 and the seventh lens L27 is f2 ₆₇ = -11.84770mm, and the Abbe coefficient of the fourth lens L24 is Vd2 ₄ = 23.8, the refractive index of the fourth lens L24 is Nd2 ₄ = 1.847, which can be obtained from the above data (R2 _{71 -} R2 ₇₂ ) / (R2 ₇₁ + R2 ₇₂ ) = - 4.991, f2 ₄ / f2 = 8.900, f2 ₆₇ / F2=-6.479, Vd2 ₄ /Nd2 ₄ =12.876, all of which can satisfy the requirements of the above conditions (5) to (8).

In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also be achieved, which can be seen from Figs. 4A to 4C. Fig. 4A is a longitudinal Spherical Aberration diagram of the wide-angle lens 2 of the second embodiment. Fig. 4B is an astigmatic field curve diagram of the wide-angle lens 2 of the second embodiment. Fig. 4C is a distortion diagram of the wide-angle lens 2 of the second embodiment.

As can be seen from FIG. 4A, the wide-angle lens 2 of the second embodiment produces a longitudinal spherical difference between -0.015 mm and 0.008 mm for light having a wavelength of 436.000 nm, 546.000 nm, and 656.000 nm. As can be seen from FIG. 4B, the wide-angle lens 2 of the second embodiment has a astigmatic field curvature between -0.04 mm and 0.01 mm in the direction of the tangential direction and the Sagittal direction for the light having a wavelength of 546.000 nm. . As can be seen from Fig. 4C, the wide-angle lens 2 of the second embodiment produces a distortion of between -100% and 0% for light having a wavelength of 546.000 nm. It can be seen that the longitudinal spherical aberration, the astigmatic field curvature, and the distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 5, which is a schematic diagram of a lens configuration and an optical path of a third embodiment of the wide-angle lens according to the present invention. The wide-angle lens 3 sequentially includes a first lens L31, a second lens L32, a third lens L33, an aperture ST3, a fourth lens L34, and a fifth from an object side to an image side along an optical axis OA3. The lens L35, a sixth lens L36, a seventh lens L37, an eighth lens L38, and a filter OF3. At the time of imaging, the light from the object side is finally imaged on an image plane IMA3. The first lens L31 is a convex-concave lens having a negative refractive power and is made of a glass material. The object side surface S31 is a convex surface, the image side surface S32 is a concave surface, and the object side surface S31 and the image side surface S32 are spherical surfaces. The second lens L32 is a biconcave lens having a negative refractive power made of a glass material, the object side surface S33 being an aspherical surface, and the image side surface S34 being an aspherical surface. The third lens L33 is a lenticular lens having a positive refractive power made of a glass material, the object side surface S35 being a spherical surface, and the image side surface S36 being a spherical surface. The fourth lens L34 is a convex-concave lens having a negative refractive power made of a glass material, and the object side surface S38 has a convex image side surface S39 as a concave surface, and the object side surface S38 and the image side surface S39 are spherical surfaces. The fifth lens L35 is a lenticular lens having a positive refractive power made of a glass material, and both the object side surface S39 and the image side surface S310 are spherical surfaces. The fourth lens L34 and the fifth lens L35 are glued to form a cemented lens. The sixth lens L36 is a lenticular lens having a positive refractive power made of a glass material, and both the object side surface S311 and the image side surface S312 are spherical surfaces. The seventh lens L37 is a biconcave lens having a negative refractive power Made of glass material, both the object side surface S312 and the image side surface S313 are spherical surfaces. The sixth lens L36 and the seventh lens L37 are glued to form a cemented lens. The eighth lens L38 is a lenticular lens having a positive refractive power made of a glass material, and both the object side surface S314 and the image side surface S315 are aspherical surfaces. The filter OF3 has a flat side surface S316 and an image side surface S317.

In addition, in order to maintain good optical performance of the wide-angle lens of the present invention, the wide-angle lens 3 of the third embodiment is required to satisfy the following four conditions:

Wherein, R3 ₇₁ is the radius of curvature of the object side surface S312 of the seventh lens L37, R3 ₇₂ is the radius of curvature of the image side surface S313 of the seventh lens L37, f3 ₄ is the effective focal length of the fourth lens L34, and f3 is the effective focal length of the wide-angle lens 3. F3 ₆₇ is an effective focal length of the cementation lens of the sixth lens L36 and the seventh lens L37, Vd3 ₄ is the Abbe coefficient of the fourth lens L34, and Nd3 ₄ is the refractive index of the fourth lens L34.

By adopting the design of the above lens and aperture ST3, the wide-angle lens 3 can effectively shorten the total length of the lens, improve the viewing angle, effectively correct the aberration, improve the resolution of the lens, and reduce the influence of the temperature change on the resolution of the lens.

Table 5 is a table of related parameters of the lenses of the wide-angle lens 3 in FIG. 5. Table 5 shows that the effective focal length of the wide-angle lens 3 of the third embodiment is equal to 1.8325 mm, the aperture value is equal to 2.0, the angle of view is equal to 174.0°, and the total length of the lens is equal to 18.000mm.

The aspherical surface depression z of each lens in Table 5 is obtained by the following formula: z = ch ² /{1 + [1 - (k + 1) c ² h ² ] ^1/2 } + Ah ⁴ + Bh ⁶ + Ch ⁸ +Dh ¹⁰

Where: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~D: aspheric coefficient.

Table 6 is the relevant parameter table of the aspherical surface of each lens in Table 5, where k is the conical coefficient (Conic Constant) and A~D is the aspherical coefficient.

In the wide-angle lens 3 of the third embodiment, the curvature radius R3 _{71 of the} object L S71 of the seventh lens L37 is -4.91214 mm, and the curvature radius R3 ₇₂ of the image side surface S313 of the seventh lens L37 is 5.00930 mm, and the fourth lens L34 is effective. The focal length f3 ₄ = -20.0008mm, the effective focal length of the wide-angle lens 3 is f3=1.8325mm, the effective focal length of the cementation lens of the sixth lens L36 and the seventh lens L37 is f3 ₆₇ = -47.05990mm, and the Abbe coefficient of the fourth lens L34 Vd3 ₄ = 23.8, and the refractive index of the fourth lens L34 is Nd3 ₄ = 1.847, which can be obtained from the above data (R3 _{71 -} R3 ₇₂ ) / (R3 ₇₁ + R3 ₇₂ ) = -102.115, f3 ₄ / f3 = -10.915, f3 ₆₇ / f3 = -25.681 and Vd3 ₄ / Nd3 ₄ = 12.876, all of which satisfy the requirements of the above conditions (9) to (12).

Further, the optical performance of the wide-angle lens 3 of the third embodiment can also be achieved, which can be seen from Figs. 6A to 6C. Fig. 6A is a longitudinal Spherical Aberration diagram of the wide-angle lens 3 of the third embodiment. Fig. 6B is an astigmatism field curve diagram of the wide-angle lens 3 of the third embodiment. Fig. 6C is a distortion diagram of the wide-angle lens 3 of the third embodiment.

As can be seen from FIG. 6A, the wide-angle lens 3 of the third embodiment produces a longitudinal spherical difference between -0.014 mm and 0.007 mm for light having a wavelength of 436.000 nm, 546.000 nm, and 656.000 nm. As can be seen from Fig. 6B, the wide-angle lens 3 of the third embodiment has a astigmatic field curvature between -0.04 mm and 0.01 mm in the direction of the tangential direction and the sagittal direction for the light having a wavelength of 546.000 nm. . As can be seen from FIG. 6C, the wide-angle lens 3 of the third embodiment produces a distortion of between -100% and 0% for light having a wavelength of 546.000 nm. It can be seen that the longitudinal spherical aberration, the astigmatic field curvature, and the distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.

1‧‧‧ wide-angle lens

L11‧‧‧ first lens

L12‧‧‧ second lens

L13‧‧‧ third lens

L14‧‧‧4th lens

L15‧‧‧ fifth lens

L16‧‧‧ sixth lens

L17‧‧‧ seventh lens

L18‧‧‧ eighth lens

ST1‧‧‧ aperture

OF1‧‧‧Filter

OA1‧‧‧ optical axis

IMA1‧‧‧ imaging surface

S11, S12, S13, S14, S15‧‧

S16, S17, S18, S19, S110‧‧‧

S111, S112, S113, S114‧‧

S115, S116, S117‧‧‧

Claims (12)

A wide-angle lens includes, in an optical axis from an object side to an image side, a first lens; a second lens, the second lens includes a concave surface facing the object side and having a negative refractive power; a third lens having a positive refractive power; a fourth lens comprising a convex surface facing the object side; a fifth lens having a positive refractive power; and a sixth lens The sixth lens has a positive refractive power; a seventh lens having a negative refractive power; and an eighth lens having a positive refractive power. The wide-angle lens of claim 1, wherein the first lens has a convex-concave lens having a negative refractive power, and a convex surface of the first lens faces the object-side concave surface toward the image side. The wide-angle lens of claim 1, wherein the second lens is a biconcave lens. The wide-angle lens of claim 3, wherein the third lens, the sixth lens, and the eighth lens are at least one lenticular lens. The wide-angle lens of claim 1, wherein the fifth lens comprises a convex surface facing the image side. The wide-angle lens of claim 1, wherein the seventh lens is a biconcave lens The wide-angle lens of claim 5, wherein the fourth lens and the fifth lens are combined to form a cemented lens or the sixth lens and the seventh lens glue are combined into a cemented lens. The wide-angle lens of claim 5, wherein the fourth lens satisfies the following conditions: -20 f ₄ /f 20 wherein f ₄ is an effective focal length of the fourth lens, and f is an effective focal length of the wide-angle lens. The wide-angle lens of claim 1, wherein the sixth lens and the seventh lens satisfy the following conditions: -30 f ₆₇ /f -5 wherein f ₆₇ is an effective focal length of the sixth lens and the seventh lens glue to form a cemented lens, and f is an effective focal length of the wide-angle lens. The wide-angle lens of claim 1, wherein the fourth lens satisfies the following conditions: 5 Vd ₄ /Nd ₄ 50, wherein Vd ₄ is an Abbe coefficient of the fourth lens, and Nd ₄ is a refractive index of the fourth lens. The wide-angle lens of claim 1, wherein the seventh lens satisfies the following condition: -110 (R ₇₁ -R ₇₂ )/(R ₇₁ +R ₇₂ ) -1 wherein R _{71 is} the radius of curvature of the side surface of the seventh lens, and R _{72 is} the radius of curvature of the image side of the seventh lens. The wide-angle lens of claim 1, further comprising an aperture disposed between the third lens and the fourth lens, and at least one of each of the second lens and the eighth lens is Aspherical surface.