TWI880047B - 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, a sixth lens, a seventh lens, and an eighth lens. The first lens is with refractive power. The second lens includes a convex surface facing an image side. The third lens is with positive refractive power. The fourth lens is with negative refractive power and includes a concave surface facing an object side. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with negative refractive power. The eighth lens is with refractive power. 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 arranged in order from the object side to the image side along an optical axis.

Description

Wide-angle lens

The present invention relates to a wide-angle lens.

The current development trend of wide-angle lenses is not only to develop towards a larger field of view, but also to have the characteristics of miniaturization, large aperture and high resolution in accordance with different application requirements. The conventional wide-angle lenses can no longer meet the current requirements, so a new wide-angle lens structure is needed to simultaneously meet the requirements of a large field of view, miniaturization, large aperture and high resolution.

In view of this, the main purpose of the present invention is to provide a wide-angle lens with a larger field of view, a shorter total lens length, a larger aperture, and a higher resolution, but still having good optical performance.

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

The first lens is a meniscus 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 meniscus lens with negative refractive power, and may further include a concave surface facing the object side.

The eighth lens is a double convex lens with positive refractive power, and includes a convex surface facing the object side and another convex surface facing the image side.

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

The fifth lens is a double convex lens, and includes a convex surface facing the object side and another convex surface facing the image side.

The sixth lens is a double convex lens, and includes a convex surface facing the object side and another convex surface facing the image side.

The seventh lens is a double concave lens, and includes a concave surface facing the object side and another concave 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 fifth lens.

TTL/f

4.9；-1.03

TTL/R22

-0.26；-4.1

TTL/R41

-3.7；0.44

f/f5

0.52；0.06

TTL/R11

0.66；0.38

f34/f67

0.61；Vd3>35；其中，TTL為第一透鏡之一物側面至一成像面沿著光軸之一間距，f為廣角鏡頭之一有效焦距，R22為第二透鏡之一像側面之一曲率半徑，R41為第四透鏡之一物側面之一曲率 半徑，f5為第五透鏡之一有效焦距，R11為第一透鏡之一物側面之一曲率半徑，f34為第三透鏡及第四透鏡之一組合有效焦距，f67為第六透鏡及第七透鏡之一組合有效焦距，Vd3為第三透鏡之一阿貝係數。 The wide-angle lens must meet at least one of the following conditions: 4.7

TTL/f

4.9; -1.03

TTL/R22

-0.26; -4.1

TTL/R41

-3.7; 0.44

f/f5

0.52; 0.06

TTL/R11

0.66; 0.38

f34/f67

0.61; Vd3>35; wherein, TTL is a distance from an object side surface of the first lens to an image surface along the optical axis, f is an effective focal length of the wide-angle lens, R22 is a curvature radius of an image side surface of the second lens, R41 is a curvature radius of an object side surface of the fourth lens, f5 is an effective focal length of the fifth lens, R11 is a curvature radius of an object side surface of the first lens, f34 is a combined effective focal length of the third lens and the fourth lens, f67 is a combined effective focal length of the sixth lens and the seventh lens, and Vd3 is an Abbe coefficient of the third lens.

In order to make the above-mentioned purposes, features, and advantages of the present invention more clearly understood, the following specifically cites a preferred embodiment and provides a detailed description with the accompanying drawings.

1, 2, 3: Wide-angle lens

L11, L21, L31: First lens

ST1, ST2, ST3: Aperture

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

OF1, OF2, OF3: Filters

CG1, CG2, CG3: Protective glass

IMA1, IMA2, IMA3: Imaging surface

OA1, OA2, OA3: optical axis

S11, S21, S31: Object side of the 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: third lens object side, third lens object side, aperture surface

S16, S26, S36: third lens image side, third lens image side, third lens object side

S17, S27, S37: aperture surface, fourth lens object side, third lens image side

S18, S28, S38: fourth lens object side, fourth lens image side, fourth lens object side

S19, S29, S39: fourth lens image side, aperture surface, 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: seventh lens object side

S115, S215, S315: Side view of the seventh lens

S116, S216, S316: The object side of the eighth lens

S117, S217, S317: Eighth lens image side

S118, S218, S318: Object side of filter

S119, S219, S319: filter image side

S120, S220, S320: Protect the glass side

S121, S221, S321: Protective glass image side

Figure 1 is a schematic diagram of the lens configuration of the first embodiment of the wide-angle lens of the present invention.

Figures 2A, 2B, 2C, 2D, and 2E are diagrams of longitudinal aberration, field curvature, distortion, lateral color, and modulation transfer function of the first embodiment of the wide-angle lens of the present invention.

Figure 3 is a schematic diagram of the lens configuration of the second embodiment of the wide-angle lens of the present invention.

Figures 4A, 4B, 4C, 4D, and 4E are longitudinal aberration diagrams, field curvature diagrams, distortion diagrams, lateral chromatic aberration diagrams, and modulation transfer function diagrams of the second embodiment of the wide-angle lens of the present invention.

Figure 5 is a schematic diagram of the lens configuration of the third embodiment of the wide-angle lens of the present invention.

Figures 6A, 6B, 6C, 6D, and 6E are longitudinal aberration diagrams, field curvature diagrams, distortion diagrams, lateral chromatic aberration diagrams, and modulation transfer function diagrams of the third embodiment of the wide-angle lens of the present invention.

The present invention provides a wide-angle lens, comprising: a first lens having refractive power; a second lens having refractive power, the second lens including a convex surface facing an image side; a third lens having positive refractive power; a fourth lens having negative refractive power, the fourth lens including a concave surface facing an object side; a fifth lens having positive refractive power; a sixth lens having positive refractive power; a seventh lens having negative refractive power; and an eighth lens having refractive power; wherein 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 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, wherein Table 1, Table 4 and Table 7 are respectively tables of relevant parameters of each lens of the first embodiment to the third embodiment of the wide-angle lens according to the present invention, and Table 2, Table 5 and Table 8 are respectively tables of relevant parameters of the aspheric surface of the aspheric lens in Table 1, Table 4 and Table 7. In the following embodiments, the concavity z of the aspheric surface of the aspheric lens 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 , wherein: c is the curvature, h is the vertical distance from any point on the lens surface to the optical axis, and k is the cone coefficient (Conic coefficient). Constant), A~C are aspheric coefficients, and E in the coefficient represents the scientific symbol, such as E-03 means 10 ^-3 .

Figures 1, 3, and 5 are schematic diagrams of the lens configuration of the first, second, and third embodiments of the wide-angle lens of the present invention. The first lens L11, L21, and L31 are meniscus lenses with negative refractive power, and their object side surfaces S11, S21, and S31 are convex surfaces, and the image side surfaces S12, S22, and S32 are concave surfaces. The object side surfaces S11, S21, and S31 and the image side surfaces S12, S22, and S32 are all spherical surfaces.

The second lenses L12, L22, and L32 are meniscus lenses with negative refractive power. Their object side surfaces S13, S23, and S33 are concave surfaces, and their image side surfaces S14, S24, and S34 are convex surfaces. The object side surfaces S13, S23, and S33 and the image side surfaces S14, S24, and S34 are all spherical surfaces.

The third lens L13, L23, and L33 are biconvex lenses with positive refractive power. The object side surfaces S15, S25, and S36 are convex surfaces, and the image side surfaces S16, S26, and S37 are convex surfaces. The object side surfaces S15, S25, and S36 and the image side surfaces S16, S26, and S37 are all spherical surfaces.

The fourth lens L14, L24, L34 has negative refractive power, and its object side surfaces S18, S27, S38 are concave surfaces, and the object side surfaces S18, S27, S38 and the image side surfaces S19, S28, S39 are all spherical surfaces.

The fifth lens L15, L25, and L35 are biconvex lenses with positive refractive power, and their object side surfaces S110, S210, and S310 are convex surfaces, and their image side surfaces S111, S211, and S311 are convex surfaces. The object side surfaces S110, S210, and S310 and the image side surfaces S111, S211, and S311 are all spherical surfaces.

The sixth lens L16, L26, and L36 are biconvex lenses with positive refractive power, and their object side surfaces S112, S212, and S312 are convex surfaces, and their image side surfaces S113, S213, and S313 are convex surfaces. The object side surfaces S112, S212, and S312 and the image side surfaces S113, S213, and S313 are all spherical surfaces.

The seventh lens L17, L27, and L37 are biconcave lenses with negative refractive power. The object side surfaces S114, S214, and S314 are concave surfaces, and the image side surfaces S115, S215, and S315 are concave surfaces. The object side surfaces S114, S214, and S314 and the image side surfaces S115, S215, and S315 are all spherical surfaces.

The eighth lens L18, L28, and L38 are biconvex lenses with positive refractive power. The object side surfaces S116, S216, and S316 are convex surfaces, and the image side surfaces S117, S217, and S317 are convex surfaces. The object side surfaces S116, S216, and S316 and the image side surfaces S117, S217, and S317 are all aspherical surfaces.

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

Vd3>35; (5)

Wherein, TTL is a distance from the object side S11, S21, S31 of the first lens L11, L21, L31 to the imaging surface IMA1, IMA2, IMA3 along the optical axis OA1, OA2, OA3, respectively, in the first to third embodiments, f is an effective focal length of the wide-angle lens 1, 2, 3 in the first to third embodiments, f5 is an effective focal length of the fifth lens L15, L25, L35 in the first to third embodiments, f34 is a combined effective focal length of the third lens L13, L23, L33 and the fourth lens L14, L24, L34 in the first to third embodiments, f67 is an effective focal length of the sixth lens L13, L23, L33 and the fourth lens L14, L24, L34 in the first to third embodiments, L16, L26, L36 is a combined effective focal length of the seventh lens L17, L27, L37, R11 is a curvature radius of the object side surface S11, S21, S31 of the first lens L11, L21, L31 in the first to third embodiments, R22 is a curvature radius of the image side surface S14, S24, S34 of the second lens L12, L22, L32 in the first to third embodiments, R41 is a curvature radius of the object side surface S18, S27, S38 of the fourth lens L14, L24, L34 in the first to third embodiments, and Vd3 is an Abbe coefficient of the third lens L13, L23, L33 in the first to third embodiments. This allows wide-angle lenses 1, 2, and 3 to effectively increase the field of view, effectively reduce the total length of the lens, effectively increase the aperture, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

TTL/f

4.9、條件(6)：-1.03

TTL/R22

-0.26、及條件(7)：-4.1

TTL/R41

-3.7時，可有效縮短廣角鏡頭總長度。 When condition (1) is met at the same time: 4.7

TTL/f

4.9, Condition (6): -1.03

TTL/R22

-0.26, and condition (7): -4.1

TTL/R41

-3.7 can effectively shorten the overall length of the wide-angle lens.

The first embodiment of the wide-angle lens of the present invention is described in detail. Referring to FIG. 1 , the wide-angle lens 1 includes a first lens L11, a second lens L12, a third lens L13, an aperture ST1, a fourth lens L14, a fifth lens L15, a sixth lens L16, a seventh lens L17, an eighth lens L18, a filter OF1 and a protective glass CG1. The first lens L11, the second lens L12, the third lens L13, the aperture ST1, the fourth lens L14, the fifth lens L15, the sixth lens L16, the seventh lens L17, the eighth lens L18, the filter OF1 and the protective glass CG1 are arranged in sequence from an object side to an image side along an optical axis OA1. When imaging, the light from the object side is finally imaged on an imaging surface IMA1. According to the first to tenth paragraphs of [Implementation Method], the fourth lens L14 is a biconcave lens, and its image side surface S19 is a concave surface; the object side surface S118 and the image side surface S119 of the filter OF1 are both planes; the object side surface S120 and the image side surface S121 of the protective glass CG1 are both planes; by using the above-mentioned lens, aperture ST1 and the design that satisfies at least one of the conditions (1) to (7), the wide-angle lens 1 can effectively increase the field of view, effectively reduce the total length of the lens, effectively increase the aperture, effectively improve the resolution, effectively correct the aberration, and effectively correct the chromatic aberration.

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 of the corresponding conditions (1) to (7). It can be seen from Table 3 that the wide-angle lens 1 of the first embodiment can meet the requirements of conditions (1) to (7).

In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements. As can be seen from FIG. 2A, the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between -0.04 mm and 0.02 mm. As can be seen from FIG. 2B, the field curvature of the wide-angle lens 1 of the first embodiment is between -0.02 mm and 0.04 mm. As can be seen from FIG. 2C, the distortion of the wide-angle lens 1 of the first embodiment is between -8% and 0%. As can be seen from FIG. 2D, the lateral chromatic aberration of the wide-angle lens 1 of the first embodiment is between -0.5 μ m and 4.0 μ m. As can be seen from FIG. 2E, the modulation transfer function value of the wide-angle lens 1 of the first embodiment is between 0.39 and 1.0. It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 1 of the first embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

The second embodiment of the wide-angle lens of the present invention is now described in detail. Referring to FIG. 3 , the wide-angle lens 2 includes a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, an aperture ST2, a fifth lens L25, a sixth lens L26, a seventh lens L27, an eighth lens L28, a filter OF2, and a protective glass CG2. The first lens L21, the second lens L22, the third lens L23, the fourth lens L24, the aperture ST2, the fifth lens L25, the sixth lens L26, the seventh lens L27, the eighth lens L28, the filter OF2 and the protective glass CG2 are arranged in sequence from an object side to an image side along an optical axis OA2. When imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to the first to tenth paragraphs of [Implementation Method], the fourth lens L24 is a meniscus lens, and its image side surface S28 is a convex surface; the object side surface S218 and the image side surface S219 of the filter OF2 are both planes; the object side surface S220 and the image side surface S221 of the protective glass CG2 are both planes; by using the above-mentioned lens, aperture ST2 and the design that satisfies at least one of the conditions (1) to (7), the wide-angle lens 2 can effectively increase the field of view, effectively reduce the total length of the lens, effectively increase the aperture, effectively improve the resolution, effectively correct the aberration, and effectively correct the chromatic aberration.

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 aspherical surface of the aspherical 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 of the corresponding conditions (1) to (7). It can be seen from Table 6 that the wide-angle lens 2 of the second embodiment can meet the requirements of conditions (1) to (7).

In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements. As can be seen from FIG. 4A, the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between -0.04 mm and 0.02 mm. As can be seen from FIG. 4B, the field curvature of the wide-angle lens 2 of the second embodiment is between -0.04 mm and 0.04 mm. As can be seen from FIG. 4C, the distortion of the wide-angle lens 2 of the second embodiment is between -35% and 0%. As can be seen from FIG. 4D, the lateral chromatic aberration of the wide-angle lens 2 of the second embodiment is between -0.5 μ m and 4.0 μ m. As can be seen from FIG. 4E, the modulation transfer function value of the wide-angle lens 2 of the second embodiment is between 0.38 and 1.0. It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 2 of the second embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

The third embodiment of the wide-angle lens of the present invention is now described in detail. Referring to FIG. 5 , the wide-angle lens 3 includes a first lens L31, a second lens L32, an aperture ST3, a third lens L33, a fourth lens L34, a fifth lens L35, a sixth lens L36, a seventh lens L37, an eighth lens L38, a filter OF3 and a protective glass CG3. The first lens L31, the second lens L32, the aperture ST3, the third lens L33, the fourth lens L34, the fifth lens L35, the sixth lens L36, the seventh lens L37, the eighth lens L38, the filter OF3 and the protective glass CG3 are arranged in sequence from an object side to an image side along an optical axis OA3. When imaging, the light from the object side is finally imaged on an imaging surface IMA3. According to the first to tenth paragraphs of [Implementation Method], the fourth lens L34 is a biconcave lens, and its image side surface S39 is a concave surface; the object side surface S318 and the image side surface S319 of the filter OF3 are both planes; the object side surface S320 and the image side surface S321 of the protective glass CG3 are both planes; by using the above-mentioned lens, aperture ST3 and the design that satisfies at least one of the conditions (1) to (7), the wide-angle lens 3 can effectively increase the field of view, effectively reduce the total length of the lens, effectively increase the aperture, effectively improve the resolution, effectively correct the aberration, and effectively correct the chromatic aberration.

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 aspherical surface of the aspherical 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 of the corresponding conditions (1) to (7). It can be seen from Table 9 that the wide-angle lens 3 of the third embodiment can meet the requirements of conditions (1) to (7).

In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements. As can be seen from FIG. 6A, the longitudinal aberration of the wide-angle lens 3 of the third embodiment is between -0.01mm and 0.03mm. As can be seen from FIG. 6B, the field curvature of the wide-angle lens 3 of the third embodiment is between -0.04mm and 0.04mm. As can be seen from FIG. 6C, the distortion of the wide-angle lens 3 of the third embodiment is between -35% and 0%. As can be seen from FIG. 6D, the lateral chromatic aberration of the wide-angle lens 3 of the third embodiment is between -0.5μm and 5.0μm. As can be seen from FIG. 6E, the modulation transfer function value of the wide-angle lens 3 of the third embodiment is between 0.39 and 1.0. It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 3 of the third embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Although the present invention has been disclosed in the form of implementation as above, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

1: Wide-angle lens

L11: First lens

L12: Second lens

L13: Third lens

ST1: Aperture

L14: The fourth lens

L15: Fifth lens

L16: Sixth lens

L17: Seventh lens

L18: Eighth lens

OF1: Filter

CG1: Protective glass

IMA1: Imaging surface

OA1: optical axis

S11: Object side of the first lens

S12: Side view of the first lens

S13: Second lens object side

S14: Second lens image side

S15: Third lens object side

S16: Third lens image side

S17: Aperture surface

S18: Fourth lens object side

S19: Fourth lens image side

S110: Fifth lens object side

S111: Fifth lens image side

S112: Object side of the sixth lens

S113: Sixth lens image side

S114: seventh lens object side

S115: Side view of the seventh lens

S116: The eighth lens object side

S117: Side view of the eighth lens

S118: Object side of filter

S119: filter image side

S120: Protect the glass side

S121: Protective glass image side

Claims (10)

A wide-angle lens comprises: a first lens having refractive power; a second lens having refractive power, the second lens comprising a convex surface facing an image side; a third lens having positive refractive power; a fourth lens having negative refractive power, the fourth lens comprising a concave surface facing an object side; a fifth lens having positive refractive power, the fifth lens comprising a convex surface facing the image side; a sixth lens being a biconvex lens having positive refractive power , and includes a convex surface facing the object side and another convex surface facing the image side; a seventh lens has negative refractive power; and an eighth lens has refractive power, and the eighth lens includes a convex surface facing the image side; wherein 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 arranged in sequence from the object side to the image side along an optical axis. As described in item 1 of the patent application, the first lens is a meniscus lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. As described in item 1 of the patent application scope, the eighth lens is a biconvex lens with positive refractive power, and further includes another convex surface facing the object side. The wide-angle lens as described in item 1 of the patent application, wherein the fifth lens is a biconvex lens and includes a convex surface facing the object side. A wide-angle lens, comprising: a first lens having refractive power; a second lens having refractive power, the second lens including a convex surface facing an image side; a third lens having positive refractive power; a fourth lens having negative refractive power, the fourth lens including a concave surface facing an object side; a fifth lens having positive refractive power, the fifth lens including a convex surface facing the image side; a sixth lens being a biconvex lens having positive refractive power and including a convex surface facing the object side. The first lens has a convex surface facing the object side and another convex surface facing the image side; a seventh lens has negative refractive power; and an eighth lens has refractive power; wherein 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 arranged in sequence along an optical axis from the object side to the image side; wherein the seventh lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side. A wide-angle lens comprises: a first lens having refractive power; a second lens being a meniscus lens having negative refractive power and including a concave surface facing an object side and a convex surface facing an image side; a third lens having positive refractive power; a fourth lens having negative refractive power, the fourth lens including a concave surface facing the object side; a fifth lens having positive refractive power; a sixth lens having positive refractive power; a seventh lens having negative refractive power; and an eighth lens having refractive power; wherein 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 arranged in sequence along an optical axis from the object side to the image side. A wide-angle lens comprises: a first lens having refractive power; a second lens having refractive power, the second lens comprising a convex surface facing an image side; a third lens being a biconvex lens having positive refractive power, and comprising a convex surface facing an object side and another convex surface facing the image side; a fourth lens having negative refractive power, the fourth lens comprising a concave surface facing the object side; A fifth lens has positive refractive power; a sixth lens has positive refractive power; a seventh lens has negative refractive power; and an eighth lens has refractive power; wherein 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 arranged in sequence from the object side to the image side along an optical axis. A wide-angle lens as described in any one of claims 1 to 3 and 5 to 7 of the patent application, wherein the wide-angle lens satisfies at least one of the following conditions: 4.7

TTL/f

4.9; -1.03

TTL/R22

-0.26; -4.1

TTL/R41

-3.7; 0.44

f/f5

0.52; 0.06

TTL/R11

0.66; 0.38

f34/f67

0.61; Vd3>35; wherein, TTL is a distance from an object side surface of the first lens to an image surface along the optical axis, f is an effective focal length of the wide-angle lens, R22 is a curvature radius of an image side surface of the second lens, R41 is a curvature radius of an object side surface of the fourth lens, f5 is an effective focal length of the fifth lens, R11 is a curvature radius of an object side surface of the first lens, f34 is a combined effective focal length of the third lens and the fourth lens, f67 is a combined effective focal length of the sixth lens and the seventh lens, and Vd3 is an Abbe coefficient of the third lens. The wide-angle lens described in Item 8 of the patent application further includes an aperture disposed between the second lens and the fifth lens. As described in Item 8 of the patent application, the fifth lens is a biconvex lens and includes a convex surface facing the object side.

Images