Wide-angle lens assembly

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 and includes a concave surface facing an image side. The second lens is a meniscus lens with refractive power. The third lens is with refractive power. The fourth lens is with positive refractive power and includes a convex surface facing the image side. The fifth lens is with positive refractive power and includes a convex surface facing an object side. The sixth lens is with negative refractive power. The seventh lens is a meniscus lens with 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

Technical Field

[0001] This invention relates to a wide-angle lens. Prior Technology

[0002] The current trend in the development of wide-angle lenses is not only towards a larger field of view, but also requires miniaturization and high resolution to meet different application needs. Conventional wide-angle lenses can no longer meet current needs, and a new architecture of wide-angle lenses is needed to simultaneously satisfy the requirements of a large field of view, miniaturization, and high resolution. Summary of the Invention

[0003] The main objective of this invention is to provide a wide-angle lens with a large field of view, short total length, and high resolution, while still maintaining good optical performance.

[0004] This invention provides a wide-angle lens comprising 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 and includes a concave surface facing the image side. The second lens is a meniscus lens with negative refractive power. The third lens has refractive power. The fourth lens has positive refractive power and includes a convex surface facing the image side. The fifth lens has positive refractive power and includes a convex surface facing the object side. The sixth lens has negative refractive power. The seventh lens is a meniscus lens with refractive power. The eighth lens has refractive power. The first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are arranged sequentially along an optical axis from the object side to the image side. When the wide-angle lens of this invention satisfies the above features, and no other additional features or conditions are required, the basic function of the wide-angle lens of this invention can be achieved.

[0005] This invention provides another wide-angle lens comprising 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 and includes a concave surface facing the image side. The second lens has refractive power. The third lens has refractive power. The fourth lens has positive refractive power and includes a concave surface facing the object side and a convex surface facing the image side. The fifth lens has positive refractive power and includes a convex surface facing the object side. The sixth lens has negative refractive power. The seventh lens has refractive power. The eighth lens has refractive power. The first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are arranged sequentially along an optical axis from the object side to the image side. When the wide-angle lens of this invention satisfies the above features, and no other additional features or conditions are required, the basic function of the wide-angle lens of this invention can be achieved.

[0006] The first lens has negative refractive power; the second lens has negative refractive power; the third lens has positive refractive power; the seventh lens has positive refractive power; and the eighth lens has positive refractive power.

[0007] The first lens is a meniscus lens and may further include a convex surface facing the object 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 fourth lens is a meniscus lens; the fifth lens is a biconvex lens and may further include another convex surface facing the image side; the sixth lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side; the seventh lens includes a concave surface facing the object side and a convex surface facing the image side; and the eighth lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side.

[0008] The second lens includes a concave surface facing the object side and a convex surface facing the image side.

[0009] The second lens includes a convex surface facing the object side and a concave surface facing the image side.

[0010] The fifth lens and the sixth lens are cemented together, and there is no air gap between the fifth lens and the sixth lens.

[0011] The wide-angle lens satisfies at least one of the following conditions: 2.69 |f2 / f| 12.86; 0.82 f4 / f 61.79; 1.96 |fG1 / f| 6.14; 2.63 (Nd5×Vd5) / (Nd6×Vd6) 3.23; -0.28 (R21-R22) / (R21+R22) 0.43; -2.66 (R81-R82) / (R81+R82) 1.56; -6.18 (R41+R42) / T4 -4.49; 58.49 TTL / d34 93.31; 33.01 TTL / d67 49.03;54.64 degrees / mm FOV / f 61.98 degrees / mm; where f is the effective focal length of one of the wide-angle lenses, f2 is the effective focal length of one of the second lenses, f4 is the effective focal length of one of the fourth lenses, fG1 is the combined effective focal length of one of the combinations of the first, second, third, and fourth lenses, Nd5 is the refractive index of one of the fifth lenses, Vd5 is the Abbe coefficient of one of the fifth lenses, Nd6 is the refractive index of one of the sixth lenses, Vd6 is the Abbe coefficient of one of the sixth lenses, R21 is the radius of curvature of one of the object-side surfaces of one of the second lenses, R22 is the radius of curvature of one of the image-side surfaces of one of the second lenses, and R41 is the radius of curvature of one of the object-side surfaces of one of the fourth lenses. Radius of curvature, R42 is the radius of curvature of the image side of the fourth lens, R81 is the radius of curvature of the object side of the eighth lens, R82 is the radius of curvature of the image side of the eighth lens, T4 is the distance between the object side and the image side of the fourth lens on the optical axis, TTL is the distance between the object side and the imaging plane of the first lens on the optical axis, d34 is the air gap between the image side and the object side of the fourth lens on the optical axis, d67 is the air gap between the image side and the object side of the sixth lens on the optical axis, FOV is the field of view of the wide-angle lens.

[0012] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Simple Explanation of the Diagram

[0013]

[0014] Figures 1, 7, and 13 are schematic diagrams of lens configurations according to the first, second, and third embodiments of the wide-angle lens of the present invention, respectively.

[0015] Figures 2, 3, 4, 5, and 6 are respectively the Longitudinal Aberration, Field Curvature, Distortion, Lateral Color, and Modulation Transfer Function diagrams of the first embodiment of the wide-angle lens according to the present invention.

[0016] Figures 8, 9, 10, 11, and 12 are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, lateral chromatic aberration diagram, and modulation conversion function diagram of the second embodiment of the wide-angle lens according to the present invention.

[0017] Figures 14, 15, 16, 17, and 18 are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, lateral chromatic aberration diagram, and modulation conversion function diagram of the third embodiment of the wide-angle lens according to the present invention. Implementation

[0018] This invention provides a wide-angle lens, comprising: a first lens having refractive power, the first lens including a concave surface facing an image side; a second lens having refractive power, the second lens being a meniscus lens; a third lens having refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing the image side; a fifth lens having positive refractive power, the fifth lens including a convex surface facing an object side; a sixth lens having negative refractive power; a seventh lens having refractive power, the seventh lens being a meniscus lens; 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 sequentially along an optical axis from the object side to the image side. When the wide-angle lens of this invention satisfies the above features, it is a preferred embodiment of this invention.

[0019] This invention provides another wide-angle lens, comprising: a first lens having refractive power, the first lens including a concave surface facing an image side; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power, the fourth lens including a concave surface facing an object side and a convex surface facing the image side; a fifth lens having positive refractive power, the fifth lens including a convex surface facing an object side; a sixth lens having negative refractive power; a seventh lens having 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 sequentially along an optical axis from the object side to the image side. When the wide-angle lens of this invention satisfies the above features, it is a preferred embodiment of this invention.

[0020] Please refer to Tables 1, 3 and 5 below, where Tables 1, 3 and 5 are the relevant parameter tables for each lens of the first to third embodiments of the wide-angle lens according to the present invention.

[0021] Figures 1, 7, and 13 are schematic diagrams of lens configurations in the first, second, and third embodiments of the wide-angle lens of the present invention, respectively. The first lenses L11, L21, and L31 are meniscus lenses with negative refractive power. Their object-side surfaces S11, S21, and S31 are convex, and their image-side surfaces S12, S22, and S32 are concave. Both the object-side surfaces S11, S21, and S31 and the image-side surfaces S12, S22, and S32 are spherical surfaces.

[0022] The second lenses L12, L22, and L32 have negative refractive power, and their object-side surfaces S13, S23, and S33, as well as their image-side surfaces S14, S24, and S34, are all spherical surfaces.

[0023] The third lenses L13, L23, and L33 are biconvex lenses with positive refractive power. Their object-side surfaces S15, S25, and S35 are convex, and their image-side surfaces S16, S26, and S36 are convex. The object-side surfaces S15, S25, and S35, as well as the image-side surfaces S16, S26, and S36, are all spherical surfaces.

[0024] The fourth lenses L14, L24, and L34 are meniscus lenses with positive refractive power. Their object-side surfaces S17, S27, and S37 are concave, and their image-side surfaces S18, S28, and S38 are convex. Both the object-side surfaces S17, S27, and S37 and the image-side surfaces S18, S28, and S38 are spherical surfaces.

[0025] The fifth lenses L15, L25, and L35 are biconvex lenses with positive refractive power. Their object-side surfaces S110, S210, and S310 are convex, and their image-side surfaces S111, S211, and S311 are convex. Both the object-side surfaces S110, S210, and S310 and the image-side surfaces S111, S211, and S311 are spherical surfaces.

[0026] The sixth lenses L16, L26, and L36 are biconcave lenses with negative refractive power. Their object-side surfaces S111, S211, and S311 are concave, and their image-side surfaces S112, S212, and S312 are concave. Both the object-side surfaces S111, S211, and S311 and the image-side surfaces S112, S212, and S312 are spherical surfaces.

[0027] The fifth lenses L15, L25, and L35 are cemented together with the sixth lenses L16, L26, and L36, and there is no air gap between the fifth lenses L15, L25, and L35 and the sixth lenses L16, L26, and L36.

[0028] The seventh lenses L17, L27, and L37 are meniscus lenses with positive refractive power. Their object-side surfaces S113, S213, and S313 are concave, while their image-side surfaces S114, S214, and S314 are convex. Both the object-side surfaces S113, S213, and S313 and the image-side surfaces S114, S214, and S314 are spherical surfaces.

[0029] The eighth lenses L18, L28, and L38 are biconvex lenses with positive refractive power. Their object-side surfaces S115, S215, and S315 are convex, and their image-side surfaces S116, S216, and S316 are convex. Both the object-side surfaces S115, S215, and S315 and the image-side surfaces S116, S216, and S316 are spherical surfaces.

[0030] In addition, wide-angle lenses 1, 2, and 3 satisfy at least one of the following conditions (1) to (10):

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

[0041] In the first to third embodiments, the important parameters are defined as follows: f is the effective focal length of one of the wide-angle lenses 1, 2, and 3; f2 is the effective focal length of one of the second lenses L12, L22, and L32; f4 is the effective focal length of one of the fourth lenses L14, L24, and L34; fG1 is the combined effective focal length of one combination of the first lenses L11, L21, and L31, the second lenses L12, L22, and L32, the third lenses L13, L23, and L33, and the fourth lenses L14, L24, and L34; Nd5 is the refractive index of one of the fifth lenses L15, L25, and L35; Vd5 is the Abbe coefficient of one of the fifth lenses L15, L25, and L35; Nd6 is the refractive index of one of the sixth lenses L16, L26, and L36; and Vd6 is the refractive index of one of the sixth lenses L16, L26, and L36. R36 is an Abbe coefficient; R21 is a radius of curvature of the object-side surfaces S13, S23, and S33 of the second lenses L12, L22, and L32; R22 is a radius of curvature of the image-side surfaces S14, S24, and S34 of the second lenses L12, L22, and L32; R41 is a radius of curvature of the object-side surfaces S17, S27, and S37 of the fourth lenses L14, L24, and L34; R42 is a radius of curvature of the image-side surfaces S18, S28, and S38 of the fourth lenses L14, L24, and L34; R81 is a radius of curvature of the object-side surfaces S115, S215, and S315 of the eighth lenses L18, L28, and L38; R82 is a radius of curvature of the image-side surfaces S116, S216, and S316 of the eighth lenses L18, L28, and L38; T4 d34 is the distance from the object-side surfaces S17, S27, S37 of the fourth lenses L14, L24, L34 to the image-side surfaces S18, S28, S38 of the fourth lenses L14, L24, L34 on the optical axes OA1, OA2, OA3; TTL is the distance from the object-side surfaces S11, S21, S31 of the first lenses L11, L21, L31 to the imaging planes IMA1, IMA2, IMA3 on the optical axes OA1, OA2, OA3; d34 is the distance from the image-side surfaces of the third lenses L13, L23, L33. The air gaps between surfaces S16, S26, and S36 and the object sides S17, S27, and S37 of the fourth lenses L14, L24, and L34 on the optical axes OA1, OA2, and OA3; d67 is the air gap between the image sides S112, S212, and S312 of the sixth lenses L16, L26, and L36 and the object sides S113, S213, and S313 of the seventh lenses L17, L27, and L37 on the optical axes OA1, OA2, and OA3; FOV is the full field of view of wide-angle lenses 1, 2, and 3. This allows wide-angle lenses 1, 2, and 3 to effectively shorten the overall lens length, effectively increase the field of view, effectively improve resolution, and effectively correct aberrations.

[0042] The first embodiment of the wide-angle lens of the present invention will now be described in detail. Referring to Figure 1, the wide-angle lens 1 includes, along an optical axis OA1 from the object side to the image side, a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, an aperture ST1, a fifth lens L15, a sixth lens L16, a seventh lens L17, an eighth lens L18, and a filter OF1. During imaging, the light rays from the object side are finally imaged onto an imaging surface IMA1. According to the first to twelfth paragraphs of the [Embodiment], wherein: the object side S13 of the second lens L12 is concave and the image side S14 is convex; the object side S117 and the image side S118 of the filter OF1 are both planar; by utilizing the above-mentioned lens, aperture ST1, and the design that satisfies at least one of conditions (1) to (10), the wide-angle lens 1 can effectively shorten the total length of the lens, effectively increase the field of view, effectively improve the resolution, and effectively correct aberrations. When the wide-angle lens of the present invention satisfies only conditions (1), (2), (3), (4), (5), (6), (7), (8), (9), or (10), and the fourth, fifth, and sixth lenses respectively have positive, positive, and negative refractive power, the first lens has a concave image side, the second lens is a meniscus lens, the fourth lens has a convex image side, the fifth lens has a convex object side, and the seventh lens is a meniscus lens, the basic operation requirements can be met. When the wide-angle lens of the present invention satisfies only conditions (1), (2), (3), (4), (5), (6), (7), (8), (9), or (10), and the fourth, fifth, and sixth lenses respectively have positive, positive, and negative refractive power, the first lens has a concave image side, the fourth lens has a concave object side, the fourth lens has a convex image side, and the fifth lens has a convex object side, the basic operation requirements can be met.

[0043] Table 1 shows the relevant parameters of each lens in wide-angle lens 1 in Figure 1.

[0044]

[0045] Table 2 shows the relevant parameter values ​​of the wide-angle lens 1 in the first embodiment and the calculated values ​​of the corresponding conditions (1) to (10). As can be seen from Table 2, the wide-angle lens 1 in the first embodiment can meet the requirements of conditions (1) to (10).

[0046]

[0047] Furthermore, the optical performance of the wide-angle lens 1 in the first embodiment also meets the requirements. As shown in Figure 2, the longitudinal aberration of the wide-angle lens 1 in the first embodiment is between -0.01mm and 0.04mm. As shown in Figure 3, the field curvature of the wide-angle lens 1 in the first embodiment is between -0.04mm and 0.03mm. As shown in Figure 4, the distortion of the wide-angle lens 1 in the first embodiment is between -90% and 0%. As shown in Figure 5, the lateral chromatic aberration of the wide-angle lens 1 in the first embodiment is between -1.0μm and 4.5μm. As shown in Figure 6, the modulation conversion function value of the wide-angle lens 1 in the first embodiment is between 0.65 and 1.0. Clearly, the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 1 in the first embodiment can be effectively corrected, and the lens resolution also meets the requirements, thus achieving better optical performance.

[0048] The second embodiment of the wide-angle lens of the present invention will now be described in detail. Referring to Figure 7, the wide-angle lens 2 includes, along an optical axis OA2, 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, and a filter OF2 in sequence from the object side to the image side. During imaging, the light rays from the object side are finally imaged onto an imaging surface IMA2. According to the first to twelfth paragraphs of the [Embodiment], wherein: the object side surface S23 of the second lens L22 is convex and the image side surface S24 is concave; the object side surface S217 and the image side surface S218 of the filter OF2 are both planar; by utilizing the above-mentioned lens, aperture ST2, and the design that satisfies at least one of conditions (1) to (10), the wide-angle lens 2 can effectively shorten the total length of the lens, effectively increase the field of view, effectively improve the resolution, and effectively correct aberrations.

[0049] Table 3 shows the relevant parameters of each lens in wide-angle lens 2 in Figure 7.

[0050]

[0051] Table 4 shows the relevant parameter values ​​of the wide-angle lens 2 in the second embodiment and the calculated values ​​of the corresponding conditions (1) to (10). As can be seen from Table 4, the wide-angle lens 2 in the second embodiment can meet the requirements of conditions (1) to (10).

[0052]

[0053] Furthermore, the optical performance of the wide-angle lens 2 in the second embodiment also meets the requirements. As shown in Figure 8, the longitudinal aberration of the wide-angle lens 2 in the second embodiment is between -0.02mm and 0.05mm. As shown in Figure 9, the field curvature of the wide-angle lens 2 in the second embodiment is between -0.02mm and 0.04mm. As shown in Figure 10, the distortion of the wide-angle lens 2 in the second embodiment is between -70% and 0%. As shown in Figure 11, the lateral chromatic aberration of the wide-angle lens 2 in the second embodiment is between -3.0μm and 7.5μm. As shown in Figure 12, the modulation conversion function value of the wide-angle lens 2 in the second embodiment is between 0.37 and 1.0. Clearly, the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 2 in the second embodiment can be effectively corrected, and the lens resolution also meets the requirements, thus achieving better optical performance.

[0054] The third embodiment of the wide-angle lens of the present invention will now be described in detail. Referring to Figure 13, the wide-angle lens 3 includes, along an optical axis OA3, a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, an aperture ST3, a fifth lens L35, a sixth lens L36, a seventh lens L37, an eighth lens L38, and a filter OF3 in sequence from the object side to the image side. During imaging, the light rays from the object side are finally imaged onto an imaging surface IMA3. According to the first to twelfth paragraphs of the [Embodiment], wherein: the object side surface S33 of the second lens L32 is concave and the image side surface S34 is convex; the object side surface S317 and the image side surface S318 of the filter OF3 are both planar; by utilizing the above-mentioned lens, aperture ST3, and the design that satisfies at least one of conditions (1) to (10), the wide-angle lens 3 can effectively shorten the total length of the lens, effectively increase the field of view, effectively improve the resolution, and effectively correct aberrations.

[0055] Table 5 shows the relevant parameters of each lens in wide-angle lens 3 in Figure 13.

[0056]

[0057]

[0058] Table 6 shows the relevant parameter values ​​of the wide-angle lens 3 in the third embodiment and the calculated values ​​of the corresponding conditions (1) to (10). As can be seen from Table 6, the wide-angle lens 3 in the third embodiment can meet the requirements of conditions (1) to (10).

[0059]

[0060] Furthermore, the optical performance of the wide-angle lens 3 in the third embodiment also meets the requirements. As shown in Figure 14, the longitudinal aberration of the wide-angle lens 3 in the third embodiment is between -0.015mm and 0.04mm. As shown in Figure 15, the field curvature of the wide-angle lens 3 in the third embodiment is between -0.05mm and 0.03mm. As shown in Figure 16, the distortion of the wide-angle lens 3 in the third embodiment is between -70% and 0%. As shown in Figure 17, the lateral chromatic aberration of the wide-angle lens 3 in the third embodiment is between -1.0μm and 3.5μm. As shown in Figure 18, the modulation conversion function value of the wide-angle lens 3 in the third embodiment is between 0.45 and 1.0. Clearly, the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 3 in the third embodiment can be effectively corrected, and the lens resolution also meets the requirements, thus achieving better optical performance.

[0061] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

[0062]

[0063] 1, 2, 3: Wide-angle lens

[0064] L11, L21, L31: First lens

[0065] L12, L22, L32: Second lenses

[0066] L13, L23, L33: Third lens

[0067] L14, L24, L34: Fourth lens

[0068] ST1, ST2, ST3: Aperture

[0069] L15, L25, L35: Fifth lens

[0070] L16, L26, L36: Sixth lens

[0071] L17, L27, L37: Seventh Lens

[0072] L18, L28, L38: Eighth lens

[0073] OF1, OF2, OF3: Filters

[0074] IMA1, IMA2, IMA3: Imaging plane

[0075] OA1, OA2, OA3: Optical axis

[0076] S11, S21, S31: Side surface of the first lens

[0077] S12, S22, S32: Side view of the first lens

[0078] S13, S23, S33: Side surface of the second lens

[0079] S14, S24, S34: Side view of the second lens

[0080] S15, S25, S35: Side view of the third lens

[0081] S16, S26, S36: Side view of the third lens

[0082] S17, S27, S37: Side view of the fourth lens

[0083] S18, S28, S38: Side view of the fourth lens

[0084] S19, S29, S39: Aperture plane

[0085] S110, S210, S310: Side surface of the fifth lens

[0086] S111, S211, S311: Side view of the fifth lens

[0087] S111, S211, S311: Side surface of the sixth lens

[0088] S112, S212, S312: Side view of the sixth lens

[0089] S113, S213, S313: Side surface of the seventh lens

[0090] S114, S214, S314: Side view of the seventh lens image

[0091] S115, S215, S315: Side surface of the eighth lens

[0092] S116, S216, S316: Side view of the eighth lens

[0093] S117, S217, S317: Side of the filter material

[0094] S118, S218, S318: Filter image side view

Claims

1. A wide-angle lens, comprising: A first lens has refractive power, the first lens including a concave surface facing an image side; A second lens has refractive power and is a meniscus lens; a third lens has refractive power; a fourth lens has positive refractive power and includes a convex surface facing the image side; a fifth lens has positive refractive power and includes a convex surface facing the object side; a sixth lens has negative refractive power; a seventh lens has refractive power and is a meniscus lens; 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 sequentially along an optical axis from the object side to the image side.

2. A wide-angle lens, comprising: A first lens has refractive power, the first lens including a concave surface facing an image side; A second lens has refractive power; a third lens has refractive power; a fourth lens has positive refractive power, the fourth lens including a concave surface facing an object side and a convex surface facing the image side; a fifth lens has positive refractive power, the fifth lens including a convex surface facing the object side; a sixth lens has negative refractive power; a seventh lens has 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 sequentially along an optical axis from the object side to the image side.

3. A wide-angle lens, comprising: A first lens has refractive power, the first lens including a concave surface facing an image side; A second lens has refractive power; a third lens has refractive power; a fourth lens has positive refractive power; a fifth lens has positive refractive power, the fifth lens including a convex surface facing an object side; a sixth lens has negative refractive power; a seventh lens has 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 sequentially along an optical axis from the object side to the image side; wherein the fifth lens and the sixth lens are cemented together, or there is no air gap between the fifth lens and the sixth lens.

4. A wide-angle lens as described in claim 1, 2 or 3, wherein the wide-angle lens satisfies at least one of the following conditions: 2.69|f2 / f|12.86; 0.82f4 / f61.79; 1.96|fG1 / f|6.14; 2.63(Nd5×Vd5) / (Nd6×Vd6)3.23; -0.28(R21-R22) / (R21+R22)0.43; -2.66(R81-R82) / (R81+R82)1.56; -6.18(R41+R42) / T4-4.49; 58.49TTL / d3493.31; 33.01TTL / d6749.03; 54.64 degrees / mmFOV / f61.98 degrees / mm; where, f is the effective focal length of one of the wide-angle lenses, f2 is the effective focal length of one of the second lenses, f4 is the effective focal length of one of the fourth lenses, fG1 is the combined effective focal length of one of the combinations of the first, second, third, and fourth lenses, Nd5 is the refractive index of one of the fifth lenses, Vd5 is the Abbe coefficient of one of the fifth lenses, Nd6 is the refractive index of one of the sixth lenses, Vd6 is the Abbe coefficient of one of the sixth lenses, R21 is the radius of curvature of one of the object-side surfaces of the second lens, R22 is the radius of curvature of one of the image-side surfaces of the second lens, R41 is the radius of curvature of one of the object-side surfaces of the fourth lens, R4 2 is the radius of curvature of the image side of the fourth lens, R81 is the radius of curvature of the object side of the eighth lens, R82 is the radius of curvature of the image side of the eighth lens, T4 is the distance between the object side and the image side of the fourth lens on the optical axis, TTL is the distance between the object side and the imaging plane of the first lens on the optical axis, d34 is the air gap between the image side and the object side of the third lens on the optical axis, d67 is the air gap between the image side and the object side of the seventh lens on the optical axis, and FOV is the field of view of the wide-angle lens.

5. A wide-angle lens, comprising: A first lens has refractive power, the first lens including a concave surface facing an image side; A second lens has refractive power; a third lens has refractive power; a fourth lens has positive refractive power; a fifth lens has positive refractive power, the fifth lens including a convex surface facing an object; a sixth lens has negative refractive power; a seventh lens has 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 along an optical axis from the object. The wide-angle lenses are arranged sequentially from side to side of the image; wherein the wide-angle lens satisfies at least one of the following conditions: 1.96|fG1 / f| 6.14; 2.63(Nd5×Vd5) / (Nd6×Vd6) 3.23; -6.18(R41+R42) / T4 -4.49; 58.49TTL / d3 49 3.31; 33.01TTL / d6 74 9.03; 54.64 degrees / mm FOV / f6 1.98 degrees / mm; In this context, f is the effective focal length of one of the wide-angle lenses, fG1 is the combined effective focal length of one of the combinations of the first lens, the second lens, the third lens, and the fourth lens, Nd5 is the refractive index of one of the fifth lenses, Vd5 is the Abbe coefficient of one of the fifth lenses, Nd6 is the refractive index of one of the sixth lenses, Vd6 is the Abbe coefficient of one of the sixth lenses, R41 is the radius of curvature of one of the object-side surfaces of the fourth lens, R42 is the radius of curvature of one of the image-side surfaces of the fourth lens, T4 is the distance between the object-side surface of the fourth lens and the image-side surface of the fourth lens on the optical axis, TTL is the distance between the object-side surface of the first lens and an imaging plane on the optical axis, d34 is the air gap between the image-side surface of the third lens and the object-side surface of the fourth lens on the optical axis, d67 is the air gap between the image-side surface of the sixth lens and the object-side surface of the seventh lens on the optical axis, and FOV is the field of view of the wide-angle lens.

6. A wide-angle lens as described in claims 1, 2, 3, or 5, wherein: The first lens has negative refractive power; the second lens has negative refractive power; the third lens has positive refractive power; the seventh lens has positive refractive power; and the eighth lens has positive refractive power.

7. The wide-angle lens as described in claim 6, wherein: The first lens is a meniscus lens and further includes a convex surface facing the object 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 fourth lens is a meniscus lens; the fifth lens is a biconvex lens and further includes another convex surface facing the image side; the sixth lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side; the seventh lens includes a concave surface facing the object side and a convex surface facing the image side. The eighth lens is a biconvex lens, and includes one convex surface facing the object side and another convex surface facing the image side.

8. The wide-angle lens as described in claim 7, wherein the second lens includes a concave surface facing the object side and a convex surface facing the image side.

9. The wide-angle lens as described in claim 7, wherein the second lens includes a convex surface facing the object side and a concave surface facing the image side.

10. The wide-angle lens as described in claim 7, wherein the fifth lens and the sixth lens are cemented together and there is no air gap between the fifth lens and the sixth lens.

Images