TWI821702B - Wide-angle lens assembly - Google Patents

Abstract

A wide-angle lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is a meniscus lens with negative refractive power. The second lens is a meniscus lens with positive refractive power. The third lens is with refractive power. The fourth lens is a biconcave lens with negative refractive power and includes a concave surface facing an object side and another concave surface facing an image side. The fifth lens is with positive refractive power and includes a convex surface facing the object side. The sixth lens is with refractive power and includes a concave surface facing the object side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in order from the object side to the image side along an optical axis.

Description

Wide angle lens(34)

The invention relates to a wide-angle lens.

The development trend of today's wide-angle lenses, in addition to the continuous development towards a large field of view, also requires high-resolution characteristics with different application requirements. The conventional wide-angle lenses can no longer meet today's needs, and another new architecture is needed. A wide-angle lens can meet the needs of both large field of view and high resolution.

In view of this, the main purpose of the present invention is to provide a wide-angle lens, which has a larger field of view and higher resolution, but still has good optical performance.

The invention provides a wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power and is a meniscus lens. The second lens has positive refractive power and is a meniscus lens. The third lens has refractive power. The fourth lens has negative refractive power. The fourth lens is a biconcave lens and includes a concave surface facing an object side and another concave surface facing an image side. The fifth lens has positive refractive power and includes a convex surface facing the object side. The sixth lens has refractive power and includes a concave surface facing the object side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side along an optical axis.

The third lens has positive refractive power, and the sixth lens has positive refractive power.

The first lens includes a convex surface facing the object side and a concave surface facing the image side.

The second lens includes a concave surface facing the object side and a convex surface facing the image side.

The third lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side.

The fifth lens is a biconvex lens, and may further include another convex surface facing the image side.

The sixth lens is a meniscus lens and may further include a convex surface facing the image side.

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

The wide-angle lens meets at least one of the following conditions: 0.6<｜R ₁₁ /R ₄₁ ｜<2.4;4<R ₂₁ /(R ₁₂ +R ₂₂ )<13.5;9.9<R ₄₂ /CT4<103;1.3<R ₅₁ / (f2-CT5)<3.5;4<f2/(CT2-CT6)<8.2; among them, R ₁₁ is the radius of curvature of one of the object side surfaces of the first lens, and R ₁₂ is the curvature of one of the image side surfaces of the first lens Radius, R ₂₁ is the radius of curvature of one of the object side surfaces of the second lens, R ₂₂ is the radius of curvature of one of the image side surfaces of the second lens, R ₄₁ is the radius of curvature of one of the object side surfaces of the fourth lens, R ₄₂ is The radius of curvature of the image side of the fourth lens, R ₅₁ is the curvature radius of the object side of the fifth lens, CT2 is the distance on the optical axis from the object side to the image side of the second lens, CT4 is The distance from the object side to the image side of the fourth lens on the optical axis, CT5 is the distance from the object side to the image side of the fifth lens on the optical axis, CT6 is the distance from the object side to the first image side of the sixth lens The distance between an image side and the optical axis, f2 is an effective focal length of the second lens.

Among them, the wide-angle lens meets the following conditions: -13<(R ₄₂ +R ₄₁ )/R ₃₂ <0.3;5mm<|R ₆₁ /Nd1|<15mm;11mm<|R ₄₁ -f2|<25mm;-3.2<f1/( R ₄₁ +f5)<2.3;3.3mm<R ₄₂ /(Vd3/Vd4)<30mm; among them, R ₃₂ is the radius of curvature of one of the image side surfaces of the third lens, and R ₄₁ is the radius of curvature of one of the object side surfaces of the fourth lens. A radius of curvature, R ₄₂ is the radius of curvature of the image side of the fourth lens, R ₆₁ is the radius of curvature of the object side of the sixth lens, Nd1 is the refractive index of the first lens, f1 is the radius of curvature of the first lens An effective focal length, f2 is the effective focal length of the second lens, f5 is the effective focal length of the fifth lens, Vd3 is the Abbe coefficient of the third lens, and Vd4 is the Abbe coefficient of the fourth lens.

In order to make the above-mentioned objects, features, and advantages of the present invention more clearly understood, preferred embodiments are described in detail below along with the accompanying drawings.

1, 2, 3: wide-angle lens

L11, L21, L31: first lens

L12, L22, L32: Second lens

ST1, ST2, ST3: Aperture

L13, L23, L33: third lens

L14, L24, L34: fourth lens

L15, L25, L35: fifth lens

L16, L26, L36: sixth lens

OF1, OF2, OF3: optical filter

CG1, CG2, CG3: Protective glass

IMA1, IMA2, IMA3: imaging surface

OA1, OA2, OA3: optical axis

S11, S21, S31: Object side of first lens

S12, S22, S32: First lens image side

S13, S23, S33: Second lens object side

S14, S24, S34: Second lens image side

S15, S25, S35: Aperture surface

S16, S26, S36: third lens object side

S17, S27, S37: Third lens image side

S18, S28, S38: Fourth lens object side

S19, S29, S39: Fourth lens image side

S110, S210, S310: Fifth lens object side

S111, S211, S311: Fifth lens image side

S112, S212, S312: Sixth lens object side

S113, S213, S313: Sixth lens image side

S114, S214, S314: side of filter object

S115, S215, S315: filter image side

S116, S216, S316: Protect the sides of glass objects

S117, S217, S317: Protective glass side

Figures 1, 3, and 5 are respectively schematic diagrams of the lens configuration and optical path of the first, second, and third embodiments of the wide-angle lens according to the present invention.

Figures 2A, 2B, 2C, and 2D are respectively longitudinal aberration (Longitudinal Aberration), field curvature (Field Curvature), distortion (Distortion), and relative illumination (Relative Illumination) diagrams of the first embodiment of the wide-angle lens according to the present invention. ) diagram.

Figures 4A, 4B, 4C, and 4D are respectively longitudinal aberration diagrams, field curvature diagrams, distortion diagrams, and relative illumination diagrams of the second embodiment of the wide-angle lens according to the present invention.

Figures 6A, 6B, 6C, and 6D are respectively longitudinal aberration diagrams, field curvature diagrams, distortion diagrams, and relative illumination diagrams of the third embodiment of the wide-angle lens according to the present invention.

The invention provides a wide-angle lens, which includes: a first lens with negative refractive power, which is a meniscus lens and includes a convex surface facing an object side and a concave surface facing an image side; a second lens having positive refractive power, The second lens is a meniscus lens and includes a concave A surface faces the object side and a convex surface faces the image side; a third lens has refractive power; a fourth lens has negative refractive power, and the fourth lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side; a The fifth lens has positive refractive power, and the fifth lens includes a convex surface facing the object side; and a sixth lens has refractive power, and the sixth lens includes a concave surface facing the object side; wherein the first lens, the second lens, the third lens, The fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side along an optical axis.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7 and Table 8 below. Table 1, Table 4 and Table 7 respectively show the lenses of the first to third embodiments of the wide-angle lens according to the present invention. The relevant parameter tables, Table 2, Table 5 and Table 8 are the relevant parameter tables of the aspheric surface of the aspheric lens in Table 1, Table 4 and Table 7 respectively. In the following embodiments, the aspheric surface of the aspheric lens The degree of depression z is obtained from 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 is the curvature, h is the vertical distance from any point on the lens surface to the optical axis, k is the conic constant (Conic Constant), A~D are aspheric coefficients, and E in the coefficients represents scientific notation, such as E-03 representing 10 ^-3 .

Figures 1, 3, and 5 are respectively schematic diagrams of the lens configuration and optical path of the first, second, and third embodiments of the wide-angle lens of the present invention. The first lenses L11, L21, and L31 are meniscus lenses with negative refractive power and are made of plastic material. The object side surfaces S11, S21, and S31 are convex surfaces, the image side surfaces S12, S22, and S32 are concave surfaces, and the object side surfaces S11, S21, and S31 and the image side surfaces S12, S22, and S32 are all aspherical surfaces. The second lens L12, L22, and L32 are meniscus lenses with positive refractive power and are made of plastic material. The object side surfaces S13, S23, and S33 are concave surfaces, the image side surfaces S14, S24, and S34 are convex surfaces, and the object side surfaces S13, S23, and S32 are convex surfaces. S33 and the image side surfaces S14, S24, and S34 are all aspherical surfaces. The third lenses L13, L23 and L33 are biconvex lenses with positive refractive power and are made of plastic material. The object side surfaces S16, S26, and S36 are convex surfaces, the image side surfaces S17, S27, and S37 are convex surfaces, and the object side surfaces S16, S26, and S36 and the image side surfaces S17, S27, and S37 are all aspherical surfaces. The fourth lens L14, L24, and L34 are biconcave lenses with negative refractive power and are made of plastic material. The object side surfaces S18, S28, and S38 are concave surfaces, the image side surfaces S19, S29, and S39 are concave surfaces, and the object side surfaces S18, S28, and S38 are concave. The image side surfaces S19, S29, and S39 are all aspherical surfaces. The fifth lens L15, L25, and L35 are biconvex lenses made of plastic material. The object side S110, S210, and S310 are convex, the image side S111, S211, and S311 are convex, and the object side S110, S210, S310, and the image side S111 are convex. , S211, and S311 are all aspherical surfaces. The sixth lens L16, L26, and L36 are meniscus lenses with positive refractive power and are made of plastic material. The object side surfaces S112, S212, and S312 are concave surfaces, the image side surfaces S113, S213, and S313 are convex surfaces, and the object side surfaces S112, S212, and S312 and image side surfaces S113, S213, and S313 are all aspherical surfaces.

Each of the first to sixth lenses of the wide-angle lens of the present invention may have an air gap between two adjacent lenses on the optical axis, that is, the first lens, the second lens, the third lens, the fourth lens, the fifth lens. The lens and the sixth lens may be six single non-cemented lenses. Since the manufacturing process of cemented lenses is more complicated than that of non-cemented lenses, especially the cemented surface of the two lenses needs to have a highly accurate curved surface in order to achieve high adhesion when the two lenses are cemented, and during the cementing process, it may also be caused by misalignment. Poor adhesion affects the overall optical imaging quality. Therefore, in the wide-angle lens of the present invention, there can be an air gap between any two adjacent lenses on the optical axis, which can ensure the simplicity of assembly of the wide-angle lens and increase the assembly yield.

In addition, wide-angle lenses 1, 2, and 3 meet at least one of the following conditions:

0.6<｜R ₁₁ /R ₄₁ |<2.4; (1)

4<R ₂₁ /(R ₁₂ +R ₂₂ )<13.5; (2)

9.9<R ₄₂ /CT4<103; (3)

1.3<R ₅₁ /(f2-CT5)<3.5; (4)

4<f2/(CT2-CT6)<8.2; (5)

5mm<｜R ₆₁ /Nd1｜<15mm; (6)

11mm<｜R ₄₁ -f2｜<25mm; (7)

-3.2<f1/(R ₄₁ +f5)<2.3; (8)

-13<(R ₄₂ +R ₄₁ )/R ₃₂ <0.3; (9)

3.3mm<R ₄₂ /(Vd3/Vd4)<30mm; (10)

Wherein, R ₁₁ is the radius of curvature of the object side surfaces S11, S21 and S31 of the first lenses L11, L21 and L31 in the first to third embodiments, and R ₁₂ is the radius of curvature in the first to third embodiments. , the curvature radius of the image side surfaces S12, S22, and S32 of the first lenses L11, L21, and L31, and R ₂₁ is the object side surface of the second lenses L12, L22, and L32 in the first to third embodiments. The radius of curvature of S13, S23, and S33, R ₂₂ is the radius of curvature of the image side surfaces S14, S24, and S34 of the second lens L12, L22, and L32 in the first to third embodiments, and R ₃₂ is the radius of curvature of S13, S23, and S33. In the first embodiment to the third embodiment, the curvature radius R ₄₁ of the image side surfaces S17, S27, S37 of the third lenses L13, L23, and L33 is the curvature radius of the fourth lens L14 in the first embodiment to the third embodiment. , the radius of curvature of the object side surfaces S18, S28, and S38 of L24 and L34, R ₄₂ is the radius of curvature of the image side surfaces S19, S29, and S39 of the fourth lens L14, L24, and L34 in the first to third embodiments. A radius of curvature, R ₅₁ is the radius of curvature of the object side surfaces S110, S210, S310 of the fifth lens L15, L25, L35 in the first to third embodiments, R ₆₁ is the radius of curvature in the first to third embodiments In the embodiment, the curvature radius CT2 of the object side surfaces S112, S212 and S312 of the sixth lens L16, L26 and L36 is the object side surface of the second lens L12, L22 and L32 in the first to third embodiments. S13, S23, S33 to the image side S14, S24, S34 is a distance on the optical axis OA1, OA2, OA3, CT4 is the object side of the fourth lens L14, L24, L34 in the first to third embodiments. S18, S28, S38 to the image side S19, S29, S39 is a distance on the optical axis OA1, OA2, OA3, CT5 is the object side of the fifth lens L15, L25, L35 in the first to third embodiments. S110, S210, S310 to the image side S111, S211, S311 is a distance on the optical axis OA1, OA2, OA3, CT6 is the object side of the sixth lens L16, L26, L36 in the first to third embodiments The distance between S112, S212, S312 and the image side S113, S213, S313 on the optical axis OA1, OA2, OA3, f1 is the effective one of the first lenses L11, L21, L31 in the first to third embodiments. Focal length, f2 is the effective focal length of the second lenses L12, L22, and L32 in the first to third embodiments, f5 is the effective focal length of the fifth lenses L15, L25, and L35 in the first to third embodiments. An effective focal length, Nd1 is the refractive index of the first lenses L11, L21, and L31 in the first to third embodiments, and Vd3 is the refractive index of the third lenses L13, L23, L33 is the Abbe coefficient, and Vd4 is the Abbe coefficient of the fourth lenses L14, L24, and L34 in the first to third embodiments. This enables wide-angle lenses 1, 2, and 3 to effectively increase the field of view, effectively improve resolution, and effectively correct aberrations.

When condition (1) is met: 0.6<｜R ₁₁ /R ₄₁ |<2.4, the wide-angle lens can be provided with sufficient refractive power to control the field of view and help correct aberrations. When condition (2) is met: 4<R ₂₁ /(R ₁₂ +R ₂₂ )<13.5, the wide-angle lens can be provided with sufficient refractive power to control the field of view and help correct aberrations. When condition (3) is met: 9.9<R ₄₂ /CT4<103, the fourth lens can have appropriate thickness and focal length to correct off-axis aberration. When condition (4) is met: 1.3<R ₅₁ /(f2-CT5)<3.5, the fifth lens can have an appropriate thickness and focal length to correct off-axis aberration. When condition (5) is met: 4<f2/(CT2-CT6)<8.2, the second lens and the fifth lens can have appropriate thickness and focal length to correct off-axis aberration. When condition (6) is met: 5mm<|R ₆₁ /Nd1|<15mm, aberration can be corrected and resolution improved. When condition (7) is met: 11mm<|R ₄₁ -f2|<25mm, aberration can be corrected and resolution improved. When condition (8) is met: -3.2<f1/(R ₄₁ +f5)<2.3, aberration can be corrected and resolution improved. When condition (9) is met: -13<(R ₄₂ +R ₄₁ )/R ₃₂ <0.3, aberration can be corrected and resolution improved. When the condition (10) is met: 3.3mm<R ₄₂ /(Vd3/Vd4)<30mm, the aberration can be corrected and the resolution can be improved.

The first embodiment of the wide-angle lens of the present invention will now be described in detail. Please refer to Figure 1. The wide-angle lens 1 sequentially includes a first lens L11, a second lens L12, an aperture ST1, a third lens L13, and a fourth lens along an optical axis OA1 from an object side to an image side. Lens L14, a fifth lens L15, a sixth lens L16, an optical filter OF1 and a protective glass CG1. During imaging, the light from the object side is finally imaged on an imaging plane IMA1. According to the first to fourth paragraphs of [Embodiment], wherein: the object side S114 and the image side S115 of the filter OF1 are both flat; the object side S116 and the image side S117 of the protective glass CG1 are both flat; using the above-mentioned lens and aperture ST1 And the design that satisfies at least one of the conditions (1) to (10) enables the wide-angle lens 1 to effectively enhance the field of view, effectively improve the resolution, and effectively correct aberrations.

Table 1 is a table of relevant parameters of each lens of the wide-angle lens 1 in Figure 1.

Table 2 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 1.

Table 3 shows the relevant parameter values of the wide-angle lens 1 of the first embodiment and the calculated values corresponding to conditions (1) to (10). From Table 3, it can be seen that the wide-angle lens 1 of the first embodiment can satisfy the conditions (1) to (10). requirements of condition (10).

In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements. It can be seen from Figure 2A that the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between -0.08mm and 0.03mm. It can be seen from Figure 2B that the field curvature of the wide-angle lens 1 of the first embodiment is between -0.12mm and 0.20mm. It can be seen from Figure 2C that the distortion of the wide-angle lens 1 of the first embodiment is between -16% and 9%. It can be seen from Figure 2D that the wide-angle lens 1 of the first embodiment has a relative illumination between 0.47 and 1.0 for light with a wavelength of 0.5550 μm in the Y field of view between 0mm and 6.4mm. It is obvious that the longitudinal aberration, field curvature, and distortion of the wide-angle lens 1 of the first embodiment can be effectively corrected, and the relative illumination can also meet the requirements, thereby obtaining better optical performance.

Please refer to Figure 3. Figure 3 is a schematic diagram of the lens configuration and optical path of the 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, an aperture ST2, a third lens L23, a fourth lens L24, and a fifth lens along an optical axis OA2 from an object side to an image side. Lens L25, a sixth lens L26, a filter OF2 and a protective glass CG2. During imaging, the light from the object side is finally imaged on an imaging plane IMA2. According to the first to fourth paragraphs of [Embodiment], wherein: the object side S214 and the image side S215 of the filter OF2 are both flat; the object side S216 and the image side S217 of the protective glass CG2 are both flat; using the above-mentioned lens and aperture ST2 And the design that satisfies at least one of the conditions (1) to (10) enables the wide-angle lens 2 to effectively enhance the field of view, effectively improve the resolution, and effectively correct aberrations.

Table 4 is a table of relevant parameters of each lens of the wide-angle lens 2 in Figure 3.

Table 5 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 4.

Table 6 shows the relevant parameter values of the wide-angle lens 2 of the second embodiment and the calculated values corresponding to conditions (1) to (10). From Table 6, it can be seen that the wide-angle lens 2 of the second embodiment can satisfy the conditions (1) to (10). requirements of condition (10).

In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements. It can be seen from Figure 4A that the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between -0.20mm and 0.05mm. It can be seen from Figure 4B that the field curvature of the wide-angle lens 2 of the second embodiment is between -0.35mm and 0.15mm. It can be seen from Figure 4C that the distortion of the wide-angle lens 2 of the second embodiment is between -10% and 9%. It can be seen from Figure 4D that the wide-angle lens 2 of the second embodiment has a relative illumination between 0.38 and 1.0 for light with a wavelength of 0.5550 μm in a Y field of view between 0mm and 6.4mm. It is obvious that the longitudinal aberration, field curvature, and distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected, and the relative illumination can also meet the requirements, thereby obtaining better optical performance.

Please refer to Figure 5. Figure 5 is a schematic diagram of the lens configuration and optical path of the 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, an aperture ST3, a third lens L33, a fourth lens L34, and a fifth lens along an optical axis OA3 from an object side to an image side. Lens L35, a sixth lens L36, a filter OF3 and a protective glass CG3. During imaging, the light from the object side is finally imaged on an imaging plane IMA3. According to the first to fourth paragraphs of [Embodiment], wherein: the object side S314 and the image side S315 of the filter OF3 are both flat; the object side S316 and the image side S317 of the protective glass CG3 are both flat; using the above-mentioned lens and aperture ST3 And the design that satisfies at least one of the conditions (1) to (10) enables the wide-angle lens 3 to effectively enhance the field of view, effectively improve the resolution, and effectively correct aberrations.

Table 7 is a table of relevant parameters of each lens of the wide-angle lens 3 in Figure 5.

Table 8 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 7.

Table 9 shows the relevant parameter values of the wide-angle lens 3 of the third embodiment and the calculated values corresponding to conditions (1) to (10). From Table 9, it can be seen that the wide-angle lens 3 of the third embodiment can satisfy the conditions (1) to (10). requirements of condition (10).

In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements. It can be seen from Figure 6A that the longitudinal aberration of the wide-angle lens 3 of the third embodiment is between -0.20mm and 0.05mm. It can be seen from Figure 6B that the field curvature of the wide-angle lens 3 of the third embodiment is between -0.30mm and 0.15mm. It can be seen from Figure 6C that the distortion of the wide-angle lens 3 of the third embodiment is between -12% and 8%. It can be seen from Figure 6D that the wide-angle lens 3 of the third embodiment has a relative illumination between 0.40 and 1.0 for light with a wavelength of 0.5550 μm in a Y field of view between 0mm and 6.4mm. It is obvious that the longitudinal aberration, field curvature, and distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected, and the relative illumination can also meet the requirements, thereby obtaining better optical performance.

Although the present invention has been disclosed in preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the art can make various modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the patent application attached.

1:Wide angle lens

L11: first lens

L12: Second lens

ST1: Aperture

L13:Third lens

L14: Fourth lens

L15: fifth lens

L16:Sixth lens

OF1: filter

CG1: Protective glass

IMA1: Imaging surface

OA1: optical axis

S11: Object side of first lens

S12: First lens image side

S13: Second lens object side

S14: Second lens image side

S15: Aperture surface

S16: Third lens object side

S17: Third lens image side

S18: Fourth lens object side

S19: Fourth lens image side

S110: Fifth lens object side

S111: Fifth lens image side

S112: Sixth lens object side

S113:Sixth lens image side

S114: Filter object side

S115: Filter image side

S116: Protect the sides of glass objects

S117: Protective glass side

Claims (9)

A wide-angle lens includes: a first lens with negative refractive power, the first lens being a meniscus lens; a second lens with positive refractive power, the second lens being a meniscus lens; a third lens having refractive power; The fourth lens has negative refractive power. The fourth lens is a biconcave lens and includes a concave surface facing an object side and another concave surface facing an image side. A fifth lens has positive refractive power. The fifth lens includes a convex surface facing the object side. ; and a sixth lens having refractive power, the sixth lens including a concave surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens The lenses are arranged sequentially along an optical axis from the object side to the image side; wherein the wide-angle lens meets at least one of the following conditions: 0.6<|R ₁₁ /R ₄₁ |<2.4;1.3<R ₅₁ /(f2-CT5) <3.5;11mm<|R ₄₁ -f2|<25mm;3.3mm<R ₄₂ /(Vd3/Vd4)<30mm; where, R ₁₁ is the radius of curvature of one of the object side surfaces of the first lens, and R ₄₁ is The radius of curvature of one of the object sides of the fourth lens, R ₅₁ is the radius of curvature of one of the object sides of the fifth lens, f2 is the effective focal length of one of the second lenses, CT5 is the object side of the fifth lens to The distance between an image side on the optical axis, R ₄₂ is the radius of curvature of one of the image sides of the fourth lens, Vd3 is the Abbe coefficient of one of the third lenses, and Vd4 is the Abbe coefficient of one of the fourth lenses. coefficient. As for the wide-angle lens described in item 1 of the patent application, the third lens has positive refractive power, and the sixth lens has positive refractive power. As in the wide-angle lens described in claim 2 of the patent application, the first lens includes a convex surface facing the object side and a concave surface facing the image side. As in the wide-angle lens described in claim 2 of the patent application, the second lens includes a concave surface facing the object side and a convex surface facing the image side. For the wide-angle lens described in Item 2 of the patent application, the third lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side. As for the wide-angle lens described in item 2 of the patent application, the fifth lens is a biconvex lens and further includes another convex surface facing the image side. The wide-angle lens described in item 1 of the patent application further includes an aperture disposed between the second lens and the third lens. In the wide-angle lens described in claim 1 of the patent application, the sixth lens further includes a convex surface facing the image side. For example, if the wide-angle lens is described in any one of claims 1 to 8 of the patent scope, the wide-angle lens meets at least one of the following conditions: 4<R ₂₁ /(R ₁₂ +R ₂₂ )<13.5;9.9<R ₄₂ /CT4<103;4<f2/(CT2-CT6)<8.2;-13< _{(R 42} +R ₄₁ )/R ₃₂ <0.3;5mm<|R ₆₁ /Nd1|<15mm;-3.2<f1/( R ₄₁ +f5)<2.3; Among them, R ₁₂ is the radius of curvature of one of the image side surfaces of the first lens, R ₂₁ is the radius of curvature of one of the object side surfaces of the second lens, and R ₂₂ is the radius of curvature of one of the object side surfaces of the second lens. The radius of curvature of an image side, R ₄₁ is the radius of curvature of the object side of the fourth lens, R ₄₂ is the radius of curvature of the image side of the fourth lens, CT2 is the object side of the second lens The distance from the object side to the first image side of the fourth lens on the optical axis, CT4 is the distance from the object side to the first image side of the fourth lens, CT6 is the distance from the object side to the first image side of the sixth lens A distance on the optical axis, f2 is the effective focal length of the second lens, R ₃₂ is the radius of curvature of the image side of the third lens, and R ₆₁ is the curvature of the object side of the sixth lens Radius, Nd1 is the refractive index of the first lens, f1 is the effective focal length of the first lens, and f5 is the effective focal length of the fifth lens.

Images