TW201738605A - 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 and a sixth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with negative refractive power and includes a concave surface facing the image side. The second lens is with refractive power and includes a concave surface facing the object side. The third lens is with refractive power and includes a convex surface facing the image side. The fourth lens is with refractive power and includes a convex surface facing the object side. The fifth lens is with refractive power and includes a concave surface facing the image side. The sixth lens is a biconvex lens with positive refractive power. The second lens and the third lens are cemented together to form a first cemented lens, wherein the first cemented lens is with positive refractive power. The fourth lens and the fifth lens are cemented together to form a second cemented lens, wherein the second cemented lens is with positive refractive power.

Description

Wide-angle lens (11)

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 large aperture and resistance to environmental temperature changes with different application requirements, the conventional wide-angle lens can no longer meet the needs of today. There is a need for a new wide-angle lens to meet the needs of miniaturization, wide viewing angle, large aperture and resistance to ambient temperature changes.

In view of this, the main object of the present invention is to provide a wide-angle lens having a short total lens length, a large viewing angle, a small aperture value, and resistance to environmental temperature changes, but still having good optical performance.

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 and a sixth lens from an object side to an image side along an optical axis. The first lens has a negative refractive power and includes a concave surface that faces the image side. The second lens has a refractive power and includes a concave surface facing the object side. The third lens has a refractive power and includes a convex surface facing the image side. The fourth lens has a refractive power and includes a convex surface facing the object side. The fifth lens has a refractive power and includes a concave surface toward the image side. The sixth lens is a lenticular lens having a positive refractive power. The second lens and the third lens glue are combined into a first cemented lens, and the first cemented lens has a positive refractive power. The fourth lens and the fifth lens glue form a second cemented lens, and the second cemented lens has a positive refractive power.

Wherein the refractive power of the second lens is negative.

The second lens may further include a convex surface facing the image side.

The second lens may further include a concave surface facing the image side.

Wherein the refractive power of the third lens is positive and the refractive power of the fifth lens is negative.

The fourth lens may further include a convex surface facing the image side, and the refractive power of the fourth lens is positive.

The wide-angle lens satisfies the following conditions: 0.2 TL/θ _m 0.4; wherein TL is a distance from an object side surface of the first lens to an imaging surface on the optical axis, the unit of the pitch is mm, and θ _m is one of the maximum half angles of the wide-angle lens, and the unit of the maximum half angle of view is degree.

The sixth lens is an aspherical lens, and may further include an aperture disposed between the third lens and the fourth lens.

Wherein the first lens satisfies the following conditions: -3 f ₁ /R ₁₂ -1.67; wherein f ₁ is the effective focal length of the first lens, and R ₁₂ is the radius of curvature of the image side of the first lens.

The first lens satisfies the following conditions: 0.7 ER ₁₁ /f 1.6; wherein ER ₁₁ is the effective radius of the side of the object of the first lens, and f is the effective focal length of the wide-angle lens.

The wide-angle lens satisfies the following conditions: 30 Vd ₂ -Vd ₃ 50; and 30 Vd ₄ -Vd ₅ 50; wherein Vd ₂ is the Abbe coefficient of the second lens, Vd ₃ is the Abbe coefficient of the third lens, Vd ₄ is the Abbe coefficient of the fourth lens, and Vd ₅ is the Abbe coefficient of the fifth 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

CL11, CL21, CL31‧‧‧ first cemented lens

CL12, CL22, CL32‧‧‧ second cemented lens

ST1, ST2, ST3‧‧ ‧ aperture

OF1, OF2, OF3‧‧‧ Filters

IS1, IS2, IS3‧‧‧ image sensor

SS1, SS2, SS3‧‧‧ sensing surface

IMA1, IMA2, IMA3‧‧‧ imaging surface

OA1, OA2, OA3‧‧‧ optical axis

CG1, CG2, CG3‧‧‧protective glass

S11, S12, S13, S14, S15, S16, S17‧‧

S18, S19, S110, S111, S112, S113‧‧‧

S114, S115‧‧‧ face

S21, S22, S23, S24, S25, S26, S27‧‧

S28, S29, S210, S211, S212, S213‧‧‧

S214, S215‧‧‧

S31, S32, S33, S34, S35, S36, S37‧‧

S38, S39, S310, S311, S312, S313‧‧

S314, S315‧‧‧

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

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

Figure 2B is a field curvature diagram of the wide-angle lens of Figure 1.

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

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

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

Figure 4B is a field curvature diagram of the wide-angle lens of Figure 3.

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

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

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

Fig. 6B is a 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 view showing the lens configuration of the first embodiment of the 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, and a filter OF1. An image sensor IS1 is placed between the filter OF1 and the image side, and one of the image sensors IS1 is located at an imaging surface IMA1. At the time of imaging, the light from the object side is finally imaged on the imaging plane IMA1. The first lens L11 has a negative refractive power, and 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 meniscus lens, and the object side surface S13 is a concave surface, the image side surface S14 is a convex surface, and the object side surface S13 and the image side surface S14 are spherical surfaces. The third lens L13 is a meniscus lens, and the object side surface S14 is a concave surface, the image side surface S15 is a convex surface, and the object side surface S14 and the image side surface S15 are spherical surfaces. The second lens L12 and the third lens L13 are glued into a first cemented lens CL11, and the first cemented lens CL11 It has a positive refractive power for the meniscus lens. The fourth lens L14 is a lenticular lens, and the object side surface S17 is a convex surface, the image side surface S18 is a convex surface, and the object side surface S17 and the image side surface S18 are spherical surfaces. The fifth lens L15 is a biconcave lens, and the object side surface S18 is a concave surface, the image side surface S19 is a concave surface, and the object side surface S18 and the image side surface S19 are spherical surfaces. The fourth lens L14 and the fifth lens L15 are glued into a second cemented lens CL12, and the second cemented lens CL12 has a positive refractive power. The sixth lens L16 is an aspherical lenticular lens having a positive refractive power, and both the object side surface S110 and the image side surface S111 are aspherical surfaces. The filter side OF1 has a flat surface S112 and an image side surface S113. The image sensor IS1 includes a protective glass CG1 and a sensing element (not shown). The protective glass CG1 is used to protect the sensing surface SS1 of the sensing element from scratching or dust adhesion, and protect the glass CG1. Each of the faces S114 and S115 is a plane.

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 five conditions:

Wherein, TL1 is the distance between the object side surface S11 of the first lens L11 and the imaging surface IMA1 on the optical axis OA1, and the unit of the pitch is mm, and θ 1 _m is the maximum half angle of view of the wide-angle lens 1, and the unit of the maximum half angle of view is degree , f1 ₁ is the effective focal length of the first lens L11, R1 ₁₂ is the radius of curvature of the image side surface S12 of the first lens L11, ER1 ₁₁ is the effective radius of the object side surface S11 of the first lens L11, and f1 is the effective focal length of the wide-angle lens 1 Vd1 ₂ is the Abbe's coefficient of the second lens L12, Vd1 ₃ is the Abbe's coefficient of the third lens L13, Vd1 ₄ is the Abbe's coefficient of the fourth lens L14, and Vd1 ₅ is the Abbe's coefficient of the fifth lens L15.

With the design of the above lens and aperture ST1, the wide-angle lens 1 can effectively shorten the total length of the lens, reduce the aperture value, effectively correct the aberration, and reduce the influence of temperature changes on the imaging quality.

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 3.502 mm, the aperture value is equal to 1.796, and the total length of the lens is equal to 14.504 mm.

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 +Eh ¹²

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

In the wide-angle lens 1 of the first embodiment, the object side surface S11 of the first lens L11 to the imaging plane IMA1 is separated from the optical axis OA1 by TL1=14.504 mm, and the maximum half angle of view θ 1 _m = 51.4 degrees, and the effective focal length of the first lens L11. F1 ₁ = - 5.247 mm, the radius of curvature R1 ₁₂ = 2.503 mm of the image side surface S12 of the first lens L11, the effective radius ER1 ₁₁ of the object side surface S11 of the first lens L11 = 2.667 mm, and the effective focal length of the wide-angle lens 1 f1 = 3.502 mm The Abbe's coefficient of the second lens L12 is Vd1 ₂ = 64.2, the Abbe's coefficient of the third lens L13 is Vd1 ₃ = 31.3, the Abbe's coefficient of the fourth lens L14 is Vd1 ₄ = 60.2, and the Abbe's coefficient of the fifth lens L15 is Vd1 ₅ =27.8, from the above data, TL1/ θ 1 _m =0.28, f1 ₁ /R1 ₁₂ =-2.10, ER1 ₁₁ /f1=0.76, Vd1 ₂ -Vd1 ₃ =32.9, Vd1 ₄ -Vd1 ₅ =32.4 The requirements of the above conditions (1) to (5) are satisfied.

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 aberration diagram of the wide-angle lens 1 of the first embodiment. Fig. 2B is a field curvature 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 longitudinal aberrations of -0.04 mm to 0.02 mm for light having wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm. between. As can be seen from FIG. 2B, the wide-angle lens 1 of the first embodiment has a wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm in the direction of the Tangential direction and the Sagittal direction. The curvature is between -0.02 mm and 0.12 mm. It can be seen from the 2Cth diagram (the five lines in the figure are almost coincident so that there appears to be only one line) that the wide-angle lens 1 of the first embodiment has a pair of wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm. The distortion produced by the light is between -36% and 0%. It can be seen that the longitudinal aberration, field curvature and distortion of the wide-angle lens 1 of the first embodiment can be Effective correction to achieve better optical performance.

Please refer to FIG. 3, which is a schematic diagram of a lens configuration of a second embodiment of the wide-angle lens according to the present invention. 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. A lens L25, a sixth lens L26, and a filter OF2. An image sensor IS2 is placed between the filter OF2 and the image side, and one of the image sensors IS2 is located at an image plane IMA2. At the time of imaging, the light from the object side is finally imaged on the imaging surface IMA2. The first lens L21 has a negative refractive power, the object side surface S21 is a concave 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 meniscus lens, and the object side surface S23 is a concave surface, the image side surface S24 is a convex surface, and the object side surface S23 and the image side surface S24 are spherical surfaces. The third lens L23 is a meniscus lens, and the object side surface S24 is a concave surface, the image side surface S25 is a convex surface, and the object side surface S24 and the image side surface S25 are spherical surfaces. The second lens L22 and the third lens L23 are glued into a first cemented lens CL21, and the first cemented lens CL21 has a positive refractive power. The fourth lens L24 is a lenticular lens, and the object side surface S27 is a convex surface, the image side surface S28 is a convex surface, and the object side surface S27 and the image side surface S28 are spherical surfaces. The fifth lens L25 is a biconcave lens, and the object side surface S28 is a concave surface, the image side surface S29 is a concave surface, and the object side surface S28 and the image side surface S29 are spherical surfaces. The fourth lens L24 and the fifth lens L25 are glued into a second cemented lens CL22, and the second cemented lens CL22 has a positive refractive power. The sixth lens L26 is an aspherical lenticular lens having a positive refractive power, and both the object side surface S210 and the image side surface S211 are aspherical surfaces. The filter side OF2 has a flat surface S212 and an image side surface S213. The image sensor IS1 includes a protective glass CG2 and a sensing component (not shown). The protective glass CG2 is used to protect the sensing surface SS2 of the sensing component from scratching or dust adhesion, and protect the glass CG2. Each of the faces S214 and S215 is a plane.

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 five conditions:

Wherein, TL2 is the distance between the object side surface S21 of the first lens L21 and the imaging surface IMA2 on the optical axis OA2, and the unit of the pitch is mm, and θ 2 _m is the maximum half angle of view of the wide-angle lens 2, and the unit of the maximum half angle of view is degree , f2 ₁ is the effective focal length of the first lens L21, R2 ₁₂ is the radius of curvature of the image side surface S22 of the first lens L21, ER2 ₁₁ is the effective radius of the object side surface S21 of the first lens L21, and f2 is the effective focal length of the wide-angle lens 2, Vd2 ₂ is the Abbe's coefficient of the second lens L22, Vd2 ₃ is the Abbe's coefficient of the third lens L23, Vd2 ₄ is the Abbe's coefficient of the fourth lens L24, and Vd2 ₅ is the Abbe's coefficient of the fifth lens L25.

By adopting the design of the above lens and aperture ST2, the wide-angle lens 2 can effectively shorten the total length of the lens, reduce the aperture value, effectively correct the aberration, and reduce the influence of temperature change on the imaging quality.

Table 3 is the relevant parameter table of each lens of the wide-angle lens 2 in Fig. 3. The data in Table 3 shows that the effective focal length of the wide-angle lens 2 of the second embodiment is equal to 3.203 mm, the aperture value is equal to 1.8, and the total length of the lens is equal to 14.207 mm.

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 +Eh ¹²

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

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

In the wide-angle lens 2 of the second embodiment, the distance between the object side surface S21 of the first lens L21 and the imaging surface IMA2 on the optical axis OA2 is TL2=14.207 mm, and the maximum half angle of view θ 2 _m = 59.5 degrees, the effective focal length of the first lens L21. F2 ₁ = -5.024 mm, the radius of curvature R2 ₁₂ = 2.500 mm of the image side surface S22 of the first lens L21, the effective radius ER2 ₁₁ of the object side surface S21 of the first lens L21 = 2.83 mm, and the effective focal length of the wide-angle lens 2 f2 = 3.203 mm The Abbe's coefficient of the second lens L22 is Vd2 ₂ = 64.2, the Abbe's coefficient of the third lens L23 is Vd2 ₃ = 31.3, the Abbe's coefficient of the fourth lens L24 is Vd2 ₄ = 60.2, and the Abbe's coefficient of the fifth lens L25 is Vd2 ₅ =27.8, from the above data, TL2 / θ 2 _m = 0.24, f2 ₁ / R2 ₁₂ = -2.01, ER2 ₁₁ / f2 = 0.88, Vd2 _{2 -} Vd2 ₃ = 32.9, Vd2 _{4 -} Vd2 ₅ = 32.4 The requirements of the above conditions (6) to (10) are satisfied.

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 aberration diagram of the wide-angle lens 2 of the second embodiment. Fig. 4B is a field curvature diagram of the wide-angle lens 2 of the second embodiment. Figure 4C shows the second real A distortion diagram of the wide-angle lens 2 of the embodiment.

As can be seen from FIG. 4A, the wide-angle lens 2 of the second embodiment produces longitudinal aberrations of -0.04 mm to 0.02 mm for light having wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm. between. As can be seen from FIG. 4B, the wide-angle lens 2 of the second embodiment has a wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm in the direction of the Tangential direction and the Sagittal direction. The curvature is between -0.05 mm and 0.11 mm. It can be seen from Fig. 4C (the five lines in the figure are almost coincident so that there appears to be only one line) that the wide-angle lens 2 of the second embodiment has wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm. The distortion produced by the light is between -54% and 0%. It can be seen that the longitudinal aberration, curvature of field, and 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 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. A lens L35, a sixth lens L36, and a filter OF3. An image sensor IS3 is placed between the filter OF3 and the image side, and one of the image sensors IS3 is located at an image plane IMA3. At the time of imaging, the light from the object side is finally imaged on the imaging surface IMA3. The first lens L31 has a negative refractive power, and 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, and the object side surface S33 is a concave surface, the image side surface S34 is a concave surface, and the object side surface S33 and the image side surface S34 are spherical surfaces. The third lens L33 is a lenticular lens, and the object side surface S34 is a convex surface, the image side surface S35 is a convex surface, and the object side surface S34 and the image side surface S35 are spherical surfaces. The second lens L32 and the third lens L33 are glued into a first cemented lens CL31, and the first cemented lens CL31 is a meniscus lens having a positive refractive power. The fourth lens L34 is a lenticular lens, and the object side surface S37 is convex The surface side image S38 is a convex surface, and the object side surface S37 and the image side surface S38 are spherical surfaces. The fifth lens L35 is a biconcave lens, and the object side surface S38 is a concave surface, the image side surface S39 is a concave surface, and the object side surface S38 and the image side surface S39 are spherical surfaces. The fourth lens L34 and the fifth lens L35 are glued into a second cemented lens CL32, and the second cemented lens CL32 has a positive refractive power. The sixth lens L36 has an aspherical lenticular lens having a positive refractive power, and both the object side surface S310 and the image side surface S311 are aspherical surfaces. The filter OF3 has a flat surface S312 and an image side surface S313. The image sensor IS3 includes a protective glass CG3 and a sensing component (not shown). The protective glass CG3 is used to protect the sensing surface SS3 of the sensing component from scratching or dust adhesion, and protect the glass CG3. Each of the faces S314 and S315 is a plane.

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 five conditions:

Wherein, TL3 is the distance between the object side surface S31 of the first lens L31 and the imaging surface IMA3 on the optical axis OA3, and the unit of the pitch is mm, and θ3 _m is the maximum half angle of view of the wide-angle lens 3, and the unit of the maximum half angle of view is degree. F3 ₁ is the effective focal length of the first lens L31, R3 ₁₂ is the radius of curvature of the image side surface S32 of the first lens L31, ER3 ₁₁ is the effective radius of the object side surface S31 of the first lens L31, and f3 is the effective focal length of the wide-angle lens 3, Vd3 ₂ is the Abbe's coefficient of the second lens L32, Vd3 ₃ is the Abbe's coefficient of the third lens L33, Vd3 ₄ is the Abbe's coefficient of the fourth lens L34, and Vd3 ₅ is the Abbe's coefficient of the fifth lens L35.

With the design of the above lens and aperture ST3, the wide-angle lens 3 can be Effectively shortens the total length of the lens, reduces the aperture value, effectively corrects aberrations, and reduces the effect of temperature changes on image quality.

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 2.833 mm, the aperture value is equal to 1.856, and the total length of the lens is equal to 14.167 mm.

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 +Eh ¹²

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

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

In the wide-angle lens 3 of the third embodiment, the object side surface S31 of the first lens L31 to the imaging plane IMA3 is on the optical axis OA3 with a distance TL3=14.167 mm, and the maximum half angle of view θ 3 _m =66.5 degrees, and the effective focal length of the first lens L31 F3 ₁ = -5.13 mm, the curvature radius R3 ₁₂ = 2.247 mm of the image side surface S32 of the first lens L31, the effective radius ER3 ₁₁ of the object side surface S31 of the first lens L31 = 4.4 mm, and the effective focal length of the wide-angle lens 3 f3 = 2.833 mm The Abbe's coefficient of the second lens L32 is Vd3 ₂ = 62.1, the Abbe's coefficient of the third lens L33 is Vd3 ₃ = 31.3, the Abbe's coefficient of the fourth lens L34 is Vd3 ₄ = 60.2, and the Abbe's coefficient of the fifth lens L35 is Vd3 ₅ =30.1, from the above data, TL3/ θ 3 _m =0.21, f3 ₁ /R3 ₁₂ =-2.28, ER3 ₁₁ /f3=1.53, Vd3 ₂ -Vd3 ₃ =30.8, Vd3 ₄ -Vd3 ₅ =30.1 The requirements of the above conditions (11) to (15) are satisfied.

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 aberration diagram of the wide-angle lens 3 of the third embodiment. Fig. 6B is a field curvature 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 longitudinal aberrations of -0.045 mm to 0.025 mm for light having wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm. between. As can be seen from Fig. 6B, the wide-angle lens 3 of the third embodiment has a wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm in the direction of the Tangential direction and the Sagittal direction. The curvature is between -0.035mm and 0.09mm. It can be seen from Fig. 6C (the five lines in the figure are almost coincident so that there appears to be only one line) that the wide-angle lens 3 of the third embodiment has wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm. The distortion caused by the light is between -66% and 0%. It can be seen that the longitudinal aberration, curvature of field, and 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

CL11‧‧‧ first cemented lens

CL12‧‧‧second cemented lens

ST1‧‧‧ aperture

OF1‧‧‧Filter

OA1‧‧‧ optical axis

IMA1‧‧‧ imaging surface

CG1‧‧‧protective glass

IS1‧‧‧Image Sensor

SS1‧‧‧ sensing surface

S11, S12, S13, S14, S15‧‧

S16, S17, S18, S19, S110‧‧‧

S111, S112, S113, S114, S115‧‧‧

Claims (11)

A wide-angle lens includes, along an optical axis, from an object side to an image side, a first lens having a negative refractive power and including a concave surface facing the image side; a second lens The second lens has a refractive power and includes a concave surface facing the object side; a third lens having a refractive power and including a convex surface facing the image side; a fourth lens having the fourth lens a refractive power and comprising a convex surface facing the object side; a fifth lens having a refractive power and comprising a concave surface facing the image side; and a sixth lens having a lenticular lens a positive refractive power; wherein the second lens and the third lens are combined to form a first cemented lens, the first cemented lens has a positive refractive power; wherein the fourth lens and the fifth lens are combined to form a second cemented lens, the first The second cemented lens has a positive refractive power. The wide-angle lens of claim 1, wherein the second lens has a refractive power that is negative. The wide-angle lens of claim 2, wherein the second lens further comprises a convex surface facing the image side. The wide-angle lens of claim 2, wherein the second lens further comprises a concave surface facing the image side. The wide-angle lens of claim 1, wherein the third lens has a positive refractive power and the fifth lens has a negative refractive power. The wide-angle lens of claim 1, wherein the fourth lens further comprises a convex surface facing the image side, and the refractive power of the fourth lens is positive. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following condition: 0.2 TL/θ _m 0.4, wherein TL is a distance from an object side surface of the first lens to an imaging surface on the optical axis, the distance is in mm, and θ _{m is} one of the maximum half angles of the wide-angle lens, and the unit of the maximum half angle of view is degree. The wide-angle lens of claim 1, wherein the sixth lens is an aspherical lens, and further includes an aperture disposed between the third lens and the fourth lens. The wide-angle lens of claim 1, wherein the first lens satisfies the following condition: -3 f ₁ /R ₁₂ -1.67 wherein f _{1 is} the effective focal length of the first lens, and R _{12 is} the radius of curvature of the image side of the first lens. The wide-angle lens of claim 1, wherein the first lens satisfies the following condition: 0.7 ER ₁₁ /f 1.6 wherein ER ₁₁ is the effective radius of the side of the object of the first lens, and f is the effective focal length of the wide-angle lens. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditions: 30 Vd ₂ -Vd ₃ 50; and 30 Vd ₄ -Vd ₅ 50; wherein Vd _{2 is} the Abbe coefficient of the second lens, Vd _{3 is} the Abbe coefficient of the third lens, Vd _{4 is} the Abbe coefficient of the fourth lens, and Vd _{5 is} the Abbe of the fifth lens coefficient.