Wide-angle lens

Abstract

A wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens has refractive power. The second lens has refractive power. The third lens has positive refractive power and comprises a convex surface facing the image side. The fourth lens element has refractive power. The fifth lens has positive refractive power and comprises a convex surface facing the image side. The sixth lens has refractive power. The seventh lens has 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 sequentially arranged from the object side to the image side along the optical axis.

Description

Technical Field

[0001] The invention relates to a wide-angle lens. Background Art

[0002] 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 response to different application requirements. Conventional wide-angle lenses can no longer meet today's needs, and 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. Summary of the invention

[0003] In view of this, the main purpose of the present invention is to provide a wide-angle lens, which has a shorter total length but still has good optical performance.

[0004] 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 a refractive power. The second lens has a refractive power. The third lens has a positive refractive power, and the third lens includes a convex surface facing the image side. The fourth lens has a refractive power. The fifth lens has a positive refractive power, and the fifth lens includes a convex surface facing the image side. The sixth lens has a refractive power. The seventh lens has a refractive power. The eighth lens has a 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 the optical axis. When the wide-angle lens of the present invention meets the above characteristics and no other additional characteristics or conditions are required, the basic functions of the wide-angle lens of the present invention can be achieved.

[0005] The present invention provides another 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 a refractive power. The second lens has a refractive power. The third lens has a positive refractive power. The fourth lens has a refractive power. The fifth lens has a positive refractive power, and the fifth lens includes a convex surface facing the image side. The sixth lens has a refractive power, and the sixth lens includes a convex surface facing the image side. The seventh lens has a refractive power. The eighth lens has a refractive power, and the eighth lens includes a concave surface facing the object side. 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 the optical axis. When the wide-angle lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic function of the wide-angle lens of the present invention can be achieved.

[0006] The first lens has negative refractive power, the second lens has positive refractive power, the fourth lens has negative refractive power, the sixth lens has positive refractive power, the seventh lens has positive refractive power, and the eighth lens has negative refractive power.

[0007] The first lens includes a concave surface facing the image side; the second lens includes a convex surface facing the object side; the third lens is a biconvex lens; the fourth lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side; the sixth lens is a biconvex lens; the seventh lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side; the eighth lens is a biconcave lens.

[0008] The first lens is a meniscus lens and may further include a convex surface facing the object side; the second lens is a meniscus lens and may further include a concave surface facing the image side.

[0009] The first lens is a meniscus lens and may further include a convex surface facing the object side; the second lens is a biconvex lens and may further include another convex surface facing the image side.

[0010] The first lens is a biconcave lens and may further include another concave surface facing the object side; the second lens is a meniscus lens and may further include a concave surface facing the image side.

[0011] The fifth lens is a biconvex lens and may further include another convex surface facing the object side.

[0012] The fifth lens is a meniscus lens and may further include a concave surface facing the object side.

[0013] The wide-angle lens satisfies at least one of the following conditions: -245≤Vd7 / (f8 / f4)≤27; -3mm≤(R51-R22) / Vd7≤41mm; -1.2mm -1 ≤(Vd2-Vd6) / R22≤0.7mm -1; -17mm≤R22 / Vd2≤6.2mm; -3.1mm≤f8-f4≤7.8mm; -7.29≤R32 / T3≤-4.16; -2.24≤(R31+R32) / T3≤2.75; 4.92mm≤T1+T2+T3≤7.95mm; 14.32≤TTL / T12≤18.01; 18.23≤TTL / T34≤36.68; wherein f4 is the effective focal length of the fourth lens, f8 is the effective focal length of the eighth lens, Vd2 is the Abbe coefficient of the second lens, Vd6 is the Abbe coefficient of the sixth lens, Vd7 is the Abbe coefficient of the seventh lens, and TTL is the distance from the object side of the first lens to the imaging plane on the optical axis R22 is the curvature radius of the image side surface of the second lens, R31 is the curvature radius of the object side surface of the third lens, R32 is the curvature radius of the image side surface of the third lens, R51 is the curvature radius of the object side surface of the fifth lens, T12 is the air distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis, T34 is the air distance between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis, T1 is the distance between the object side surface of the first lens and the image side surface of the first lens on the optical axis, T2 is the distance between the object side surface of the second lens and the image side surface of the second lens on the optical axis, and T3 is the distance between the object side surface of the third lens and the image side surface of the third lens on the optical axis.

[0014] The wide-angle lens of the present invention has a shorter total length but still has good optical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of lens configuration and light path according to the first embodiment of the present invention.

[0017] Figure 2 , 3 4 are respectively a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram according to the first embodiment of the present invention.

[0018] Figure 5 Schematic diagram of lens configuration and optical path according to the second embodiment of the present invention.

[0019] Figure 6 , 7 8 are respectively a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram according to the second embodiment of the present invention.

[0020] Fig. 9 Schematic diagram of lens configuration and optical path according to the third embodiment of the present invention.

[0021] Fig.10 , 11 1 and 12 are respectively a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of the third embodiment of the wide-angle lens according to the present invention.

[0022] Fig.13 Schematic diagram of lens configuration and optical path according to the fourth embodiment of the present invention.

[0023] Fig.14 Schematic diagram of lens configuration and light path according to the fifth embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention provides a wide-angle lens, comprising: a first lens having refractive power; a second lens having refractive power; a third lens having positive refractive power, the third lens including a convex surface facing the image side; a fourth lens having refractive power; a fifth lens having positive refractive power, the fifth lens including a convex surface facing the image side; a sixth lens having 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 in sequence from the object side to the image side along the optical axis. When the wide-angle lens of the present invention meets the above characteristics, it is a preferred embodiment of the present invention.

[0025] The present invention provides another wide-angle lens, comprising: a first lens having refractive power; a second lens having refractive power; a third lens having positive refractive power; a fourth lens having refractive power; a fifth lens having positive refractive power, the fifth lens including a convex surface facing the image side; a sixth lens having refractive power, the sixth lens including a convex surface facing the image side; a seventh lens having refractive power; and an eighth lens having refractive power, the eighth 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, the sixth lens, the seventh lens and the eighth lens are arranged in sequence from the object side to the image side along the optical axis. When the wide-angle lens of the present invention meets the above characteristics, it is a preferred embodiment of the present invention.

[0026] Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10, Table 11, Table 13 and Table 14 below, wherein Table 1, Table 4, Table 7, Table 10 and Table 13 are respectively tables of relevant parameters of each lens of the first embodiment to the fifth embodiment of the wide-angle lens according to the present invention, and Table 2, Table 5, Table 8, Table 11 and Table 14 are respectively tables of relevant parameters of the aspherical surface of the aspherical lens in Table 1, Table 4, Table 7, Table 10 and Table 13. In the following embodiments, the concavity z of the aspherical surface of the aspherical 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 +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, and A to D are aspheric coefficients. Aspheric coefficients can be expressed in scientific notation, for example, 2.00E-03 means 2.00×10 -3 .

[0027] Figure 1 , 5 , 9, 13, 14 are respectively the lens configuration and optical path schematic diagrams of the first, second, third, fourth, and fifth embodiments of the wide-angle lens of the present invention. Among them, the first lens L11, L21, L31, L41, L51 has negative refractive power, and its image side surface S12, S22, S32, S42, S52 is a concave surface, and the object side surface S11, S21, S31, S41, S51 and the image side surface S12, S22, S32, S42, S52 are all spherical surfaces.

[0028] The second lenses L12, L22, L32, L42, and L52 have positive refractive power, and their object-side surfaces S13, S23, S33, S43, and S53 are convex surfaces, and the object-side surfaces S13, S23, S33, S43, and S53 and the image-side surfaces S14, S24, S34, S44, and S54 are spherical surfaces.

[0029] The third lens L13, L23, L33, L43, L53 is a biconvex lens with positive refractive power, whose object-side surfaces S16, S26, S36, S46, S56 are convex surfaces, and image-side surfaces S17, S27, S37, S47, S57 are convex surfaces, and the object-side surfaces S16, S26, S36, S46, S56 and image-side surfaces S17, S27, S37, S47, S57 are aspherical surfaces.

[0030] The fourth lens L14, L24, L34, L44, L54 is a biconcave lens with negative refractive power, whose object-side surfaces S18, S28, S38, S48, S58 are concave surfaces, and image-side surfaces S19, S29, S39, S49, S59 are concave surfaces, and the object-side surfaces S18, S28, S38, S48, S58 and image-side surfaces S19, S29, S39, S49, S59 are all spherical surfaces.

[0031] The fifth lens L15, L25, L35, L45, L55 has positive refractive power, and its image-side surfaces S111, S211, S311, S411, S511 are convex surfaces, and the object-side surfaces S110, S210, S310, S410, S510 and the image-side surfaces S111, S211, S311, S411, S511 are spherical surfaces.

[0032] The sixth lens L16, L26, L36, L46, L56 are biconvex lenses with positive refractive power, whose object-side surfaces S112, S212, S312, S412, S512 are convex surfaces, and image-side surfaces S113, S213, S313, S413, S513 are convex surfaces, and the object-side surfaces S112, S212, S312, S412, S512 and image-side surfaces S113, S213, S313, S413, S513 are aspherical surfaces.

[0033] The seventh lens L17, L27, L37, L47, L57 are biconvex lenses with positive refractive power, whose object-side surfaces S114, S214, S314, S414, S514 are convex surfaces, and image-side surfaces S115, S215, S315, S415, S515 are convex surfaces, and the object-side surfaces S114, S214, S314, S414, S514 and image-side surfaces S115, S215, S315, S415, S515 are spherical surfaces.

[0034] The eighth lens L18, L28, L38, L48, L58 is a biconcave lens with negative refractive power, whose object-side surfaces S116, S216, S316, S416, S516 are concave surfaces, and image-side surfaces S117, S217, S317, S417, S517 are concave surfaces, and the object-side surfaces S116, S216, S316, S416, S516 and image-side surfaces S117, S217, S317, S417, S517 are aspherical surfaces.

[0035] In addition, the wide-angle lenses 1, 2, 3, 4, and 5 satisfy at least one of the following conditions (1) to (10):

[0036] -245≤Vd7 / (f8 / f4)≤27; (1)

[0037] -3mm≤(R51-R22) / Vd7≤41mm; (2)

[0038] -1.2mm -1 ≤(Vd2-Vd6) / R22≤0.7mm -1 ; (3)

[0039] -17mm≤R22 / Vd2≤6.2mm; (4)

[0040] -3.1mm≤f8-f4≤7.8mm; (5)

[0041] -7.29≤R32 / T3≤-4.16; (6)

[0042] -2.24≤(R31+R32) / T3≤2.75; (7)

[0043] 4.92mm≤T1+T2+T3≤7.95mm; (8)

[0044] 14.32≤TTL / T12≤18.01; (9)

[0045] 18.23≤TTL / T34≤36.68; (10)

[0046] Wherein, f4 is the effective focal length of the fourth lens L14, L24, L34, L44, L54 in the first to fifth embodiments, f8 is the effective focal length of the eighth lens L18, L28, L38, L48, L58 in the first to fifth embodiments, Vd2 is the Abbe coefficient of the second lens L12, L22, L32, L42, L52 in the first to fifth embodiments, Vd6 is the Abbe coefficient of the sixth lens L16, L26, L36, L46, L56 in the first to fifth embodiments, Vd7 is the Abbe coefficient of the seventh lens L17, L27, L37, L47, L57 in the first to fifth embodiments, TTL is the distance between the object-side surfaces S11, S21, S31, S41, S51 of the first lens L11, L21, L31, L41, L51 and the imaging surfaces IMA1, IMA2, IMA3, IMA4, IMA5 on the optical axes OA1, OA2, OA3, OA4, OA5 in the first to fifth embodiments, R22 is the curvature radius of the image-side surfaces S14, S24, S34, S44, S54 of the second lens L12, L22, L32, L42, L52 in the first to fifth embodiments, R31 is the object-side surface of the third lens L13, L23, L33, L43, L53 in the first to fifth embodiments, R32 is the curvature radius of the image-side surface S17, S27, S37, S47, S57 of the third lens L13, L23, L33, L43, L53 in the first to fifth embodiments, R51 is the curvature radius of the object-side surface S110, S210, S310, S410, S510 of the fifth lens L15, L25, L35, L45, L55 in the first to fifth embodiments, T12 is the curvature radius of the image-side surface S12, S22, S32, S42, S52 of the first lens L11, L21, L31, L41, L51 in the first to fifth embodiments an air distance from the object side surface S13, S23, S33, S43, S53 of the second lens L12, L22, L32, L42, L52 on the optical axis OA1, OA2, OA3, OA4, OA5, T34 is the air distance from the image side surface S17, S27, S37, S47, S57 of the third lens L13, L23, L33, L43, L53 to the object side surface S18, S28, S38, S48, S58 of the fourth lens L14, L24, L34, L44, L54 on the optical axis OA1, OA2, OA3, OA4, OA5 in the first to fifth embodiments, T1 is the air distance from the image side surface S17, S27, S37, S47, S57 of the third lens L13, L23, L33, L43, L53 to the object side surface S18, S28, S38, S48, S58 of the fourth lens L14, L24, L34, L44, L54 on the optical axis OA1, OA2, OA3, OA4, OA5 in the first to fifth embodiments,The distances between the object-side surfaces S11, S21, S31, S41, S51 of the first lens L11, L21, L31, L41, L51 and the image-side surfaces S12, S22, S32, S42, S52 of the first lens L11, L21, L31, L41, L51 on the optical axes OA1, OA2, OA3, OA4, OA5, and T2 are the distances between the object-side surfaces S13, S23, S33, S43, S53 of the second lens L12, L22, L32, L42, L52 and the image-side surfaces S12, S22, S32, S42, S52 of the first lens L11, L21, L31, L41, L51 on the optical axes OA1, OA2, OA3, OA4, OA5, and T3 are the distances between the object-side surfaces S13, S23, S33, S43, S53 of the second lens L12, L22, L32, L42, L52 and the image-side surfaces S12, S22, S32, S42, S52 of the first lens L11, L21, L31, L41, L51 on the optical axes OA1, OA2, OA3, OA4, OA5, and T4 are the distances between the object-side surfaces S13, S23, S33, S43, S53 of the second lens L12, L22, L32, L42, L52 and the image-side surfaces S12, S22, S32, S42, S52 of the first lens L11, L21, L31, L41, L51 on the optical axes OA1, OA2, OA3, OA4, OA5, and T5 are the distances 32, L42, L52, the image side surface S14, S24, S34, S44, S54 on the optical axis OA1, OA2, OA3, OA4, OA5, T3 is the distance between the object side surface S16, S26, S36, S46, S56 of the third lens L13, L23, L33, L43, L53 and the image side surface S17, S27, S37, S47, S57 of the third lens L13, L23, L33, L43, L53 on the optical axis OA1, OA2, OA3, OA4, OA5 in the first embodiment to the fifth embodiment. The wide-angle lenses 1, 2, 3, 4, 5 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively correct the aberration.

[0047] When condition (3) is met: -1.2mm -1 ≤(Vd2-Vd6) / R22≤0.7mm -1 , which can effectively reduce chromatic aberration. When condition (4) is met: -17mm≤R22 / Vd2≤6.2mm, chromatic aberration can be effectively reduced. When condition (5) is met: -3.1mm≤f8-f4≤7.8mm, the lens manufacturing yield can be effectively improved and the lens size can be reduced. When condition (6) is met: -7.29≤R32 / T3≤-4.16, the lens manufacturing yield can be effectively improved and the lens size can be reduced. When condition (7) is met: -2.24≤(R31+R32) / T3≤2.75, the lens manufacturing yield can be effectively improved and the lens size can be reduced. When condition (8) is met: 4.92mm≤T1+T2+T3≤7.95mm, the lens manufacturing yield can be effectively improved and the lens size can be reduced. When condition (9) is met: 14.32≤TTL / T12≤18.01, the lens manufacturing yield can be effectively improved and the lens size can be reduced. When condition (10) is met: 18.23≤TTL / T34≤36.68, the lens manufacturing yield can be effectively improved and the lens size can be reduced.

[0048] The first embodiment of the wide-angle lens of the present invention is now described in detail. Figure 1The wide-angle lens 1 includes a first lens L11, a second lens L12, an aperture ST1, a third lens L13, a fourth lens L14, a fifth lens L15, a sixth lens L16, a seventh lens L17 and an eighth lens L18 in order from the object side to the image side along the optical axis OA1. When imaging, the light from the object side is finally imaged on the imaging surface IMA1. According to the first to eleventh paragraphs of [Specific Implementation], the first lens L11 is a meniscus lens, and its object side surface S11 is a convex surface; the second lens L12 is a meniscus lens, and its image side surface S14 is a concave surface; the fifth lens L15 is a biconvex lens, and its object side surface S110 is a convex surface; by using 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 reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively correct the aberration. When the wide-angle lens of the present invention only satisfies condition (1), condition (2) or condition (5) and the refractive surface shape characteristics in the independent terms, the basic actuation requirements can be met.

[0049] Table 1 Figure 1 Table of relevant parameters of each lens of medium wide angle lens 1.

[0050] Table 1

[0051]

[0052] Table 2 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 1.

[0053] Table 2

[0054]

[0055] 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). 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 (10).

[0056] Table 3

[0057] T1 0.70mm T2 3.46mm T3 3.65mm T12 1.60mm T34 1.00mm Vd7 / (f8 / f4) -243.90 (R51-R22) / Vd7 40.69mm (Vd2-Vd6) / R22 <![CDATA[-0.38mm -1 ]]> R22 / Vd2 6.08mm f8-f4 -0.29mm R32 / T3 -5.20 (R31+R32) / T3 -1.37 T1+T2+T3 7.81mm TTL / T12 17.84 TTL / T34 28.42

[0058] In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements. Figure 2 It can be seen that the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between -0.02mm and 0.01mm. Figure 3 It can be seen that the field curvature of the wide-angle lens 1 of the first embodiment is between -0.04mm and 0.035mm. Figure 4It can be seen that the distortion of the wide-angle lens 1 of the first embodiment is between -7% and 0%. 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, thereby obtaining better optical performance.

[0059] The second embodiment of the wide-angle lens of the present invention is now described in detail. Figure 5 The wide-angle lens 2 includes a first lens L21, a second lens L22, an aperture ST2, a third lens L23, a fourth lens L24, a fifth lens L25, a sixth lens L26, a seventh lens L27 and an eighth lens L28 in order from the object side to the image side along the optical axis OA2. When imaging, the light from the object side is finally imaged on the imaging surface IMA2. According to the first to eleventh paragraphs of [Specific Implementation], the first lens L21 is a meniscus lens, and its object side surface S21 is a convex surface; the second lens L22 is a biconvex lens, and its image side surface S24 is a convex surface; the fifth lens L25 is a biconvex lens, and its object side surface S210 is a convex surface; by using 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 reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively correct the aberration. When the wide-angle lens of the present invention only satisfies condition (3) or condition (4) and the refractive surface shape characteristics in the independent terms, the basic actuation requirements can be met.

[0060] Table 4 is Figure 5 Table of relevant parameters of each lens of medium wide angle lens 2.

[0061] Table 4

[0062]

[0063]

[0064] Table 5 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 4.

[0065] Table 5

[0066]

[0067] 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). 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 (10).

[0068] Table 6

[0069] T1 0.70mm T2 1.63mm T3 2.80mm T12 1.94mm T34 1.29mm Vd7 / (f8 / f4) 26.09 (R51-R22) / Vd7 5.40mm (Vd2-Vd6) / R22 <![CDATA[0.18mm -1 ]]> R22 / Vd2 -16.93mm f8-f4 2.45mm R32 / T3 -7.14 (R31+R32) / T3 -1.78 T1+T2+T3 5.13mm TTL / T12 15.43 TTL / T34 23.24

[0070] In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements. Figure 6It can be seen that the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between -0.01 mm and 0.02 mm. Figure 7 It can be seen that the field curvature of the wide-angle lens 2 of the second embodiment is between -0.06mm and 0.01mm. Figure 8 It can be seen that the distortion of the wide-angle lens 2 of the second embodiment is between -7% and 0%. 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, thereby obtaining better optical performance.

[0071] The third embodiment of the wide-angle lens of the present invention is now described in detail. Fig. 9 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 and an eighth lens L38 in order from the object side to the image side along the optical axis OA3. When imaging, the light from the object side is finally imaged on the imaging surface IMA3. According to the first to eleventh paragraphs of [Specific Implementation], the first lens L31 is a meniscus lens, and its object side surface S31 is a convex surface; the second lens L32 is a meniscus lens, and its image side surface S34 is a concave surface; the fifth lens L35 is a meniscus lens, and its object side surface S310 is a concave surface; by using 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 reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively correct the aberration. When the wide-angle lens of the present invention only satisfies condition (6), condition (7) or condition (8) and the refractive surface shape characteristics in the independent terms, the basic actuation requirements can be met.

[0072] Table 7 Fig. 9 Table of relevant parameters of each lens of medium wide angle lens 3.

[0073] Table 7

[0074]

[0075]

[0076] Table 8 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 7.

[0077] Table 8

[0078]

[0079] 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). 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 (10).

[0080] Table 9

[0081] T1 0.70mm T2 1.92mm T3 3.67mm T12 2.07mm T34 1.04mm Vd7 / (f8 / f4) 19.79 (R51-R22) / Vd7 -2.00mm (Vd2-Vd6) / R22 <![CDATA[-1.10mm -1 ]]> R22 / Vd2 3.06mm f8-f4 2.53mm R32 / T3 -4.93 (R31+R32) / T3 -1.36 T1+T2+T3 6.29mm TTL / T12 14.49 TTL / T34 28.82

[0082] In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements. Fig.10 It can be seen that the longitudinal aberration of the wide-angle lens 3 of the third embodiment is between -0.01 mm and 0.02 mm. Fig.11 It can be seen that the field curvature of the wide-angle lens 3 of the third embodiment is between -0.05mm and 0.01mm. Fig.12 It can be seen that the distortion of the wide-angle lens 3 of the third embodiment is between -7% and 0%. 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, thereby obtaining better optical performance.

[0083] The fourth embodiment of the wide-angle lens of the present invention is now described in detail. Fig.13 , the wide-angle lens 4 includes a first lens L41, a second lens L42, an aperture ST4, a third lens L43, a fourth lens L44, a fifth lens L45, a sixth lens L46, a seventh lens L47 and an eighth lens L48 in order from the object side to the image side along the optical axis OA4. When imaging, the light from the object side is finally imaged on the imaging surface IMA4. According to the first to tenth paragraphs of [Specific Implementation], wherein: the first lens L41 is a meniscus lens, and its object side surface S41 is a convex surface; the second lens L42 is a double convex lens, and its image side surface S44 is a convex surface; the fifth lens L45 is a meniscus lens, and its object side surface S410 is a concave surface; by using the above-mentioned lens, aperture ST4 and a design that satisfies at least one of conditions (1) to (10), the wide-angle lens 4 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively correct the aberration. When the wide-angle lens of the present invention only satisfies condition (9) or condition (10) and the refractive surface shape characteristics in the independent terms, the basic actuation requirements can be met.

[0084] Table 10 Fig.13 Table of relevant parameters of each lens of the medium wide angle lens 4.

[0085] Table 10

[0086]

[0087] Table 11 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 10.

[0088] Table 11

[0089]

[0090]

[0091] Table 12 shows the relevant parameter values ​​of the wide-angle lens 4 of the fourth embodiment and the calculated values ​​corresponding to conditions (1) to (10). It can be seen from Table 12 that the wide-angle lens 4 of the fourth embodiment can meet the requirements of conditions (1) to (10).

[0092] Table 12

[0093] T1 0.70mm T2 0.95mm T3 3.41mm T12 1.84mm T34 0.84mm Vd7 / (f8 / f4) 9.04 (R51-R22) / Vd7 -0.31mm (Vd2-Vd6) / R22 <![CDATA[0.57mm -1 ]]> R22 / Vd2 -3.37mm f8-f4 7.74mm R32 / T3 -6.49 (R31+R32) / T3 -2.01 T1+T2+T3 5.06mm TTL / T12 16.30 TTL / T34 35.84

[0094] The fifth embodiment of the wide-angle lens of the present invention is now described in detail. Fig.14 , the wide-angle lens 5 includes a first lens L51, a second lens L52, an aperture ST5, a third lens L53, a fourth lens L54, a fifth lens L55, a sixth lens L56, a seventh lens L57 and an eighth lens L58 in order from the object side to the image side along the optical axis OA5. When imaging, the light from the object side is finally imaged on the imaging surface IMA5. According to the first to tenth paragraphs of [Specific Implementation], wherein: the first lens L51 is a biconcave lens, and its object side surface S51 is a concave surface; the second lens L52 is a meniscus lens, and its image side surface S54 is a concave surface; the fifth lens L55 is a meniscus lens, and its object side surface S510 is a concave surface; by using the above-mentioned lens, aperture ST5 and the design that satisfies at least one of conditions (1) to (10), the wide-angle lens 5 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively correct the aberration.

[0095] Table 13 Fig.14 Table of relevant parameters of each lens of medium wide angle lens 5.

[0096] Table 13

[0097]

[0098]

[0099] Table 14 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 13.

[0100] Table 14

[0101]

[0102] Table 15 shows the relevant parameter values ​​of the wide-angle lens 5 of the fifth embodiment and the calculated values ​​corresponding to conditions (1) to (10). It can be seen from Table 15 that the wide-angle lens 5 of the fifth embodiment can meet the requirements of conditions (1) to (10).

[0103] Table 15

[0104] T1 0.70mm T2 1.85mm T3 2.66mm T12 1.93mm T34 1.57mm Vd7 / (f8 / f4) -29.67 (R51-R22) / Vd7 -1.88mm (Vd2-Vd6) / R22 <![CDATA[-0.43mm -1 ]]> R22 / Vd2 4.92mm f8-f4 -3.03mm R32 / T3 -4.31 (R31+R32) / T3 2.52 T1+T2+T3 5.21mm TTL / T12 15.52 TTL / T34 19.07

[0105] Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Those skilled in the art may 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 determined by the claims.

Claims

1. A wide-angle lens, characterized in that: include: The first lens has a refractive power; The second lens has a refractive power; The third lens has positive refractive power, and the third lens includes a convex surface facing the image side; The fourth lens has refractive power; The fifth lens has positive refractive power, and the fifth lens includes a convex surface facing the image side; The sixth lens has refractive power; The seventh lens has refractive power; as well as 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 the optical axis.

2. A wide-angle lens, characterized in that: include: The first lens has a refractive power; The second lens has a refractive power; The third lens has positive refractive power; The fourth lens has refractive power; The fifth lens has positive refractive power, and the fifth lens includes a convex surface facing the image side; The sixth lens has refractive power, and the sixth lens includes a convex surface facing the image side; The seventh lens has refractive power; and The eighth lens has refractive power, and the eighth lens includes a concave surface facing the object side; 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 the optical axis.

3. The wide-angle lens according to claim 1 or 2, characterized in that: The first lens has negative refractive power; The second lens has positive refractive power; The fourth lens has negative refractive power; The sixth lens has positive refractive power; The seventh lens has positive refractive power; and The eighth lens has negative refractive power.

4. The wide-angle lens according to claim 3, characterized in that: The first lens comprises a concave surface facing the image side; The second lens comprises a convex surface facing the object side; The third lens is a biconvex lens; The fourth lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side; The sixth lens is a biconvex lens; The seventh lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side; and The eighth lens is a biconcave lens.

5. The wide-angle lens according to claim 4, characterized in that: The first lens is a meniscus lens and further includes a convex surface facing the object side; and The second lens is a meniscus lens and further includes a concave surface facing the image side.

6. The wide-angle lens according to claim 4, characterized in that: The first lens is a meniscus lens and further includes a convex surface facing the object side; and The second lens is a biconvex lens and further includes another convex surface facing the image side.

7. The wide-angle lens according to claim 4, characterized in that: The first lens is a biconcave lens and further includes another concave surface facing the object side; and The second lens is a meniscus lens and further includes a concave surface facing the image side.

8. The wide-angle lens according to claim 4, characterized in that: The fifth lens is a biconvex lens and further includes another convex surface facing the object side.

9. The wide-angle lens according to claim 4, wherein: The fifth lens is a meniscus lens and further includes a concave surface facing the object side.

10. The wide-angle lens according to claim 1 or 2, characterized in that: The wide-angle lens meets at least one of the following conditions: -245≤Vd7 / (f8 / f4)≤27; -3mm≤(R51-R22) / Vd7≤41mm; -1.2mm -1 ≤(Vd2-Vd6) / R22≤0.7mm -1 ; -17mm≤R22 / Vd2≤6.2mm; -3.1mm≤f8-f4≤7.8mm; -7.29≤R32 / T3≤-4.16; -2.24≤(R31+R32) / T3≤2.75; 4.92mm≤T1+T2+T3≤7.95mm; 14.32≤TTL / T12≤18.01; 18.23≤TTL / T34≤36.68; Wherein, f4 is the effective focal length of the fourth lens, f8 is the effective focal length of the eighth lens, Vd2 is the Abbe coefficient of the second lens, Vd6 is the Abbe coefficient of the sixth lens, Vd7 is the Abbe coefficient of the seventh lens, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, R22 is the curvature radius of the image side surface of the second lens, R31 is the curvature radius of the object side surface of the third lens, R32 is the curvature radius of the image side surface of the third lens, and R51 is the curvature radius of the object side surface of the fifth lens. curvature radius, T12 is the air distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis, T34 is the air distance between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis, T1 is the distance between the object side surface of the first lens and the image side surface of the first lens on the optical axis, T2 is the distance between the object side surface of the second lens and the image side surface of the second lens on the optical axis, and T3 is the distance between the object side surface of the third lens and the image side surface of the third lens on the optical axis.

Images