Wide-angle lens assembly

Abstract

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

Description

Technical Field

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

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

[0003] In view of this, the main object of the present invention is to provide a wide-angle lens with a relatively large field of view, a relatively short total lens length, and a relatively high resolution, but still having good optical performance.

[0004] For the convenience of representing the parameters referred to in the present invention, the following are defined in this specification and the drawings: f is the effective focal length of a wide-angle lens, f1 is the effective focal length of a first lens, f2 is the effective focal length of a second lens, f4 is the effective focal length of a fourth lens, f5 is the effective focal length of a fifth lens, f456 is the combined effective focal length of the combination of the fourth lens, the fifth lens, and the sixth lens, Vd4 is the Abbe number of the fourth lens, Vd5 is the Abbe number of the fifth lens, Vd6 is the Abbe number of the sixth lens, T12 is the air spacing on the optical axis from the image side of the first lens to the object side of the second lens, T23 is the air spacing on the optical axis from the image side of the second lens to the object side of the third lens, T45 is the air spacing on the optical axis from the image side of the fourth lens to the object side of the fifth lens, TTL is the spacing on the optical axis from the object side of the first lens to the imaging surface, BFL is the spacing on the optical axis from the image side of the sixth lens to the imaging surface, d1 is the spacing on the optical axis from the object side of the first lens to the image side of the first lens, d2 is the spacing on the optical axis from the object side of the second lens to the image side of the second lens, d3 is the spacing on the optical axis from the object side of the third lens to the image side of the third lens, AAG is the total air spacing sum on the optical axis between the first lens and the sixth lens, R11 is the radius of curvature of the object side of the first lens, and R12 is the radius of curvature of the image side of the first lens.

[0005] The present invention provides a wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has a negative refractive power and includes a convex surface facing an object side. The second lens has a refractive power. The third lens has a refractive power. The fourth lens has a positive refractive power. The fifth lens has a refractive power and includes a concave surface facing an image side. The sixth lens has a refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in sequence along an optical axis from the object side to the image side. The wide-angle lens satisfies at least one of the following conditions: 118.59 TTL / T45 172.47;0.56 (R11-R12) / TTL 0.76;0.6 (R11-R12) / (R11+R12) 0.7;2.37mm d1+d2+d3 4.05mm. The wide-angle lens satisfies at least one of the following conditions: 1.17 BFL / f 1.65;0.72 f / (T12+T23) 1.34;0.55 f / AAG 0.93. When the wide-angle lens of the present invention satisfies the above characteristics and conditions and does not require other additional characteristics or conditions, the basic functions of the wide-angle lens of the present invention can be achieved.

[0006] The present invention provides another wide-angle lens composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has a negative refractive power and includes a convex surface facing an object side. The second lens is a meniscus lens having a refractive power and includes a concave surface facing the object side and a convex surface facing an image side. The third lens has a refractive power. The fourth lens has a positive refractive power. The fifth lens is a meniscus lens having a refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The sixth lens has a refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in sequence along an optical axis from the object side to the image side. When the wide-angle lens of the present invention satisfies the above characteristics and does not require other additional characteristics or conditions, the basic functions of the wide-angle lens of the present invention can be achieved.

[0007] Wherein the second lens has a negative refractive power, the third lens has a positive refractive power, the fifth lens has a negative refractive power, and the sixth lens has a positive refractive power.

[0008] Wherein the first lens is a meniscus lens and may further include a concave surface facing the image side, the third lens includes a convex surface facing the image side, the fourth lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side, and the sixth lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side.

[0009] Wherein the second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side, the third lens includes a concave surface facing the object side, and the fifth lens may further include a concave surface facing the object side.

[0010] Wherein the second lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side, the third lens includes a convex surface facing the object side, and the fifth lens may further include a concave surface facing the object side.

[0011] The wide-angle lens of the present invention may further include a diaphragm disposed between the third lens and the fourth lens.

[0012] Wherein the wide-angle lens satisfies at least one of the following conditions: -18.8mm f1 + f2 -10.1mm; -1.4 f4 / f5 0; 0.75 f4 / f456 0.95; 2 Vd4 / Vd5 3.4; 2 Vd6 / Vd5 3.3; 105 Vd4 + Vd6 130; 2.5 TTL / BFL 6.54; 7.2 TTL / f 8.6.

[0013] Wherein the wide-angle lens satisfies at least one of the following conditions: 118.59 TTL / T45 172.47; 0.56 (R11 - R12) / TTL 0.76; 0.6 (R11 - R12) / (R11 + R12) 0.7; 2.37mm d1 + d2 + d3 4.05mm; 1.17 BFL / f 1.65; 0.72 f / (T12 + T23) 1.34; 0.55 f / AAG 0.93。

[0014] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specifically gives preferred embodiments and detailed descriptions in conjunction with the accompanying drawings. Brief Description of the Drawings

[0015] Figure 1 is a schematic diagram of lens configuration and optical path according to the first embodiment of the present invention. Figures 2, 3, 4, and 5 are respectively the field curvature diagram, distortion diagram, modulation transfer function diagram, and through focus modulation transfer function diagram according to the first embodiment of the present invention. Figure 6 is a schematic diagram of lens configuration and optical path according to the second embodiment of the present invention. Figures 7, 8, 9, and 10 are respectively the field curvature diagram, distortion diagram, modulation transfer function diagram, and through focus modulation transfer function diagram according to the second embodiment of the present invention. Figure 11 is a schematic diagram of lens configuration and optical path according to the third embodiment of the present invention. Figures 12, 13, 14, and 15 are respectively the field curvature diagram, distortion diagram, modulation transfer function diagram, and through focus modulation transfer function diagram according to the third embodiment of the present invention. Figure 16 is a schematic diagram of lens configuration and optical path according to the fourth embodiment of the present invention. Figures 17, 18, 19, and 20 are respectively the field curvature diagram, distortion diagram, modulation transfer function diagram, and through focus modulation transfer function diagram according to the fourth embodiment of the present invention. Figure 21 is a schematic diagram of lens configuration and optical path according to the fifth embodiment of the present invention. Figures 22, 23, 24, and 25 are respectively the field curvature diagram, distortion diagram, modulation transfer function diagram, and through focus modulation transfer function diagram according to the fifth embodiment of the present invention. FIG. 26 is a schematic diagram of a lens configuration and an optical path according to a sixth embodiment of the present invention. FIGS. 27, 28, 29, and 30 are a field curvature diagram, a distortion diagram, a modulation transfer function diagram, and a defocus modulation transfer function diagram, respectively, according to a sixth embodiment of the present invention. Embodiment

[0016] The present invention provides a wide-angle lens, comprising: a first lens having a negative refractive power, the first lens including a convex surface facing an object side; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a positive refractive power; a fifth lens having a refractive power, the fifth lens including a concave surface facing an image side; and a sixth lens having a refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in sequence along an optical axis from the object side to the image side; wherein the wide-angle lens satisfies at least one of the following conditions: 118.59 TTL / T45 172.47; 0.56 (R11 - R12) / TTL 0.76; 0.6 (R11 - R12) / (R11 + R12) 0.7; 2.37 mm d1 + d2 + d3 4.05 mm; wherein the wide-angle lens satisfies at least one of the following conditions: 1.17 BFL / f 1.65; 0.72 f / (T12 + T23) 1.34; 0.55 f / AAG 0.93. When the wide-angle lens of the present invention satisfies the above characteristics and conditions, it is a preferred embodiment of the present invention.

[0017] The present invention provides another wide-angle lens, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the first lens has a negative refractive power and includes a convex surface facing an object side; the second lens is a meniscus lens with refractive power and includes a concave surface facing the object side and a convex surface facing an image side; the third lens has refractive power; the fourth lens has a positive refractive power; the fifth lens is a meniscus lens with refractive power and includes a convex surface facing the object side and a concave surface facing the image side; and the sixth lens has refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in sequence along an optical axis from the object side to the image side. When the wide-angle lens of the present invention satisfies the above characteristics, it is a preferred embodiment of the present invention.

[0018] Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10, Table 11, Table 13, Table 14, Table 16, and Table 17 below. Among them, Table 1, Table 4, Table 7, Table 10, Table 13, and Table 16 are the relevant parameter tables of each lens of the first to sixth embodiments of the wide-angle lens according to the present invention, and Table 2, Table 5, Table 8, Table 11, Table 14, and Table 17 are the relevant parameter tables of the aspherical surfaces of the aspherical lenses in Table 1, Table 4, Table 7, Table 10, Table 13, and Table 16 respectively. In the following embodiments, the aspherical surface sag z of the aspherical lens is obtained by the following formula: z = ch2 / {1 + [1 - (k + 1)c2h2]1 / 2} + Ah4 + Bh6 + Ch8 + Dh10 + Eh12 + Fh14 + Gh16 + Hh18, where: c is the curvature, h is the perpendicular distance from any point on the lens surface to the optical axis, k is the conic constant, and A to H are the aspherical coefficients, and the aspherical coefficients can be expressed in scientific notation. For example, 2E-03 represents 2×10-3.

[0019] Figures 1, 6, 11, 16, 21, and 26 are respectively the lens configurations and optical path schematic diagrams of the first, second, third, fourth, fifth, and sixth embodiments of the wide-angle lens of the present invention. Among them, the first lenses L11, L21, L31, L41, L51, and L61 are meniscus lenses with negative refractive power, their object sides S11, S21, S31, S41, S51, and S61 are convex surfaces, and their image sides S12, S22, S32, S42, S52, and S62 are concave surfaces. The object sides S11, S21, S31, S41, S51, and S61 and the image sides S12, S22, S32, S42, S52, and S62 are all spherical surfaces.

[0020] The second lenses L12, L22, L32, L42, L52, L62 have negative refractive powers, and their object sides S13, S23, S33, S43, S53, S63 and image sides S14, S24, S34, S44, S54, S64 are all aspherical surfaces.

[0021] The third lenses L13, L23, L33, L43, L53, L63 have positive refractive powers, and their image sides S16, S26, S36, S46, S56, S66 are convex surfaces.

[0022] The fourth lenses L14, L24, L34, L44, L54, L64 are biconvex lenses with positive refractive powers, their object sides S18, S28, S38, S48, S58, S68 are convex surfaces, their image sides S19, S29, S39, S49, S59, S69 are convex surfaces, and their object sides S18, S28, S38, S48, S58, S68 and image sides S19, S29, S39, S49, S59, S69 are all spherical surfaces.

[0023] The fifth lenses L15, L25, L35, L45, L55, L65 have negative refractive powers, and their image sides S111, S211, S311, S411, S511, S611 are concave surfaces.

[0024] The sixth lenses L16, L26, L36, L46, L56, L66 are biconvex lenses with positive refractive powers, their object sides S112, S212, S312, S412, S512, S612 are convex surfaces, their image sides S113, S213, S313, S413, S513, S613 are convex surfaces, and their object sides S112, S212, S312, S412, S512, S612 and image sides S113, S213, S313, S413, S513, S613 are all aspherical surfaces.

[0025] In addition, the wide-angle lenses 1, 2, 3, 4, 5, 6 satisfy at least one of the following conditions (1) to (15):

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

[0041] Enable the wide-angle lenses 1, 2, 3, 4, 5, and 6 to effectively reduce the total lens length, effectively improve the resolution, and effectively correct the aberration.

[0042] When the condition (1) is satisfied: -18.8mm f1 + f2 -10.1mm, the light-gathering ability can be effectively improved to increase the field of view. When the condition (2) is satisfied: -1.4 f4 / f5 0, the resolution can be effectively improved. When the condition (3) is satisfied: 0.75 f4 / f456 0.95, the tolerance sensitivity can be effectively reduced. When the condition (4) is satisfied: 2 Vd4 / Vd5 3.4, the resolution can be effectively improved. When the condition (5) is satisfied: 2 Vd6 / Vd5 3.3, the resolution can be effectively improved. When the condition (6) is satisfied: 105 Vd4 + Vd6 130, the resolution can be effectively improved. When the condition (7) is satisfied: 2.5 TTL / BFL 6.54, the resolution can be effectively improved. When the condition (8) is satisfied: 7.2 TTL / f 8.6, the total lens length can be effectively shortened. When the condition (9) is satisfied: 1.17 BFL / f 1.65, the field curvature can be effectively reduced. When the condition (10) is satisfied: 118.59 TTL / T45 172.47, the field curvature can be effectively reduced. When the condition (11) is satisfied: 0.72 f / (T12 + T23) 1.34, the field curvature can be effectively reduced. When the condition (12) is satisfied: 0.55 f / AAG 0.93, the field curvature can be effectively reduced. When the condition (13) is satisfied: 0.56 (R11 - R12) / TTL 0.76, the field curvature can be effectively reduced. When the condition (14) is satisfied: 0.6 (R11 - R12) / (R11 + R12) 0.7 can effectively reduce field curvature. When the condition (15) is satisfied: 2.37 mm d1 + d2 + d3 4.05 mm can effectively reduce field curvature.

[0043] Now, a first embodiment of the wide - angle lens of the present invention will be described in detail. The wide - angle lens 1 sequentially includes a first lens L11, a second lens L12, a third lens L13, a diaphragm ST1, a fourth lens L14, a fifth lens L15, a sixth lens L16, a filter OF1, and a protective glass CG1 along an optical axis OA1 from an object side to an image side. When imaging, the light from the object side is finally imaged on an imaging surface IMA1. According to the first to ninth paragraphs of the

Embodiment Manner

[0044] Table 1 is a table of the relevant parameters of each lens of the wide - angle lens 1 in FIG. 1.

[0045] Table 2 is a table of the relevant parameters of the aspherical surfaces of the aspherical lenses in Table 1.

[0046] Table 3 shows the relevant parameter values of the wide-angle lens 1 of the first embodiment and the calculated values for the corresponding conditions (1) to (15). From Table 3, it can be seen that the wide-angle lens 1 of the first embodiment can meet the requirements of conditions (1) to (15).

[0047] 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 Figure 2, the field curvature of the wide-angle lens 1 of the first embodiment is between -0.04 mm and 0.035 mm. As can be seen from Figure 3, the distortion of the wide-angle lens 1 of the first embodiment is between -35% and 0%. As can be seen from Figure 4, the modulation transfer function value of the wide-angle lens 1 of the first embodiment is between 0.52 and 1.0. As can be seen from Figure 5, for the wide-angle lens 1 of the first embodiment, when the focus offset is between -0.05 mm and 0.05 mm, the modulation transfer function value is between 0.0 and 0.86. Obviously, the field curvature and distortion of the wide-angle lens 1 of the first embodiment can be effectively corrected, and the lens resolution and depth of focus can also meet the requirements, thus obtaining better optical performance.

[0048] Now, a second embodiment of the wide-angle lens of the present invention will be described in detail. The wide-angle lens 2 sequentially includes a first lens L21, a second lens L22, a third lens L23, an aperture ST2, a fourth lens L24, a fifth lens L25, a sixth lens L26, a filter OF2, and a protective glass CG2 along an optical axis OA2 from an object side to an image side. When imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to the first to ninth paragraphs of the

Embodiment

[0049] Table 4 is a table of relevant parameters of each lens of the wide-angle lens 2 in FIG. 6.

[0050] Table 5 is a table of relevant parameters of the aspherical surfaces of the aspherical lenses in Table 4.

[0051] Table 6 is a table of relevant parameter values of the wide-angle lens 2 of the second embodiment and their calculated values corresponding to the conditions (1) to (15). It can be seen from Table 6 that the wide-angle lens 2 of the second embodiment can satisfy the requirements of the conditions (1) to (15).

[0052] 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. 7, the field curvature of the wide-angle lens 2 of the second embodiment is between -0.02 mm and 0.045 mm. As can be seen from FIG. 8, the distortion of the wide-angle lens 2 of the second embodiment is between -40% and 0%. As can be seen from FIG. 9, the modulation transfer function value of the wide-angle lens 2 of the second embodiment is between 0.54 and 1.0. As can be seen from FIG. 10, for the wide-angle lens 2 of the second embodiment, when the focus shift is between -0.05 mm and 0.05 mm, the modulation transfer function value is between 0.0 and 0.86. Obviously, the field curvature and distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected, and the lens resolution and depth of focus can also meet the requirements, thereby obtaining better optical performance.

[0053] Now, a third embodiment of the wide-angle lens of the present invention will be described in detail. The wide-angle lens 3 sequentially includes a first lens L31, a second lens L32, a third lens L33, an aperture ST3, a fourth lens L34, a fifth lens L35, a sixth lens L36, a filter OF3, and a protective glass CG3 along an optical axis OA3 from an object side to an image side. During imaging, the light from the object side is finally imaged on an imaging surface IMA3. According to the first to ninth paragraphs of the

Embodiment Manner

[0054] Table VII is a table of relevant parameters of each lens of the wide-angle lens 3 in FIG. 11.

[0055] Table VIII is a table of relevant parameters of the aspherical surfaces of the aspherical lenses in Table VII.

[0056] Table 9 shows the relevant parameter values of the wide-angle lens 3 of the third embodiment and the calculated values for the corresponding conditions (1) to (15). From Table 9, it can be seen that the wide-angle lens 3 of the third embodiment can meet the requirements of conditions (1) to (15).

[0057] 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 Figure 12, the field curvature of the wide-angle lens 3 of the third embodiment is between -0.04 mm and 0.045 mm. As can be seen from Figure 13, the distortion of the wide-angle lens 3 of the third embodiment is between -40% and 0%. As can be seen from Figure 14, the modulation transfer function value of the wide-angle lens 3 of the third embodiment is between 0.49 and 1.0. As can be seen from Figure 15, for the wide-angle lens 3 of the third embodiment, when the focus offset is between -0.05 mm and 0.05 mm, the modulation transfer function value is between 0.0 and 0.84. Obviously, the field curvature and distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected, and the lens resolution and depth of focus can also meet the requirements, thereby obtaining better optical performance.

[0058] Now, a fourth embodiment of the wide-angle lens of the present invention will be described in detail. The wide-angle lens 4 includes, in order from an object side to an image side along an optical axis OA4, a first lens L41, a second lens L42, a third lens L43, a diaphragm ST4, a fourth lens L44, a fifth lens L45, a sixth lens L46, a filter OF4, and a protective glass CG4. When imaging, the light from the object side is finally imaged on an imaging surface IMA4. According to the first to ninth paragraphs of the

Embodiment

[0059] Table X is a table of the relevant parameters of each lens of the wide-angle lens 4 in FIG. 16.

[0060] Table XI is a table of the relevant parameters of the aspherical surfaces of the aspherical lenses in Table X.

[0061] Table XII is a table of the relevant parameter values of the wide-angle lens 4 of the fourth embodiment and their calculated values corresponding to the conditions (1) to (15). It can be seen from Table XII that the wide-angle lens 4 of the fourth embodiment can satisfy the requirements of the conditions (1) to (15).

[0062] In addition, the optical performance of the wide-angle lens 4 of the fourth embodiment can also meet the requirements. As can be seen from FIG. 17, the field curvature of the wide-angle lens 4 of the fourth embodiment is between -0.20 mm and -0.02 mm. As can be seen from FIG. 18, the distortion of the wide-angle lens 4 of the fourth embodiment is between -9% and 4%. As can be seen from FIG. 19, the modulation transfer function value of the wide-angle lens 4 of the fourth embodiment is between 0.45 and 1.0. As can be seen from FIG. 20, for the wide-angle lens 4 of the fourth embodiment, when the focus offset is between -0.05 mm and 0.05 mm, the modulation transfer function value is between 0.0 and 0.82. Obviously, the field curvature and distortion of the wide-angle lens 4 of the fourth embodiment can be effectively corrected, and the lens resolution and depth of focus can also meet the requirements, thereby obtaining better optical performance.

[0063] Now, a fifth embodiment of the wide-angle lens of the present invention will be described in detail. The wide-angle lens 5 sequentially includes a first lens L51, a second lens L52, a third lens L53, an aperture ST5, a fourth lens L54, a fifth lens L55, a sixth lens L56, a filter OF5, and a protective glass CG5 along an optical axis OA5 from an object side to an image side. When imaging, the light from the object side is finally imaged on an imaging surface IMA5. According to the first to ninth paragraphs of the [Embodiment Manner], where: the second lens L52 is a meniscus lens, its object side surface S53 is convex, and its image side surface S54 is concave; the third lens L53 is a meniscus lens, its object side surface S55 is concave, the object side surface S55 is an aspherical surface, and the image side surface S56 is an aspherical surface; the fifth lens L55 is a biconcave lens, its object side surface S510 is concave, the object side surface S510 is an aspherical surface, and the image side surface S511 is an aspherical surface; the filter OF5 has both its object side surface S514 and image side surface S515 as flat surfaces; the protective glass CG5 has both its object side surface S516 and image side surface S517 as flat surfaces; by using the above lenses, aperture ST5, and a design that satisfies at least one of the conditions (1) to (15), the wide-angle lens 5 can effectively reduce the total lens length, effectively improve the resolution, and effectively correct the aberration.

[0064] Table XIII is a table of the relevant parameters of each lens of the wide-angle lens 5 in FIG. 21.

[0065] Table XIV is a table of the relevant parameters of the aspherical surfaces of the aspherical lenses in Table XIII.

[0066] Table XV shows the relevant parameter values of the wide-angle lens 5 of the fifth embodiment and the calculated values for the corresponding conditions (1) to (15). It can be seen from Table XV that the wide-angle lens 5 of the fifth embodiment can meet the requirements of conditions (1) to (15).

[0067] In addition, the optical performance of the wide-angle lens 5 of the fifth embodiment can also meet the requirements. As can be seen from Fig. 22, the field curvature of the wide-angle lens 5 of the fifth embodiment is between -0.03 mm and 0.03 mm. As can be seen from Fig. 23, the distortion of the wide-angle lens 5 of the fifth embodiment is between -16% and 2%. As can be seen from Fig. 24, the modulation transfer function value of the wide-angle lens 5 of the fifth embodiment is between 0.54 and 1.0. As can be seen from Fig. 25, for the wide-angle lens 5 of the fifth embodiment, when the focus offset is between -0.05 mm and 0.05 mm, the modulation transfer function value is between 0.0 and 0.86. Obviously, the field curvature and distortion of the wide-angle lens 5 of the fifth embodiment can be effectively corrected, and the lens resolution and depth of focus can also meet the requirements, thereby obtaining better optical performance.

[0068] Now, a sixth embodiment of the wide-angle lens of the present invention will be described in detail. The wide-angle lens 6 sequentially includes a first lens L61, a second lens L62, a third lens L63, an aperture ST6, a fourth lens L64, a fifth lens L65, a sixth lens L66, a filter OF6, and a protective glass CG6 along an optical axis OA6 from an object side to an image side. When imaging, the light from the object side is finally imaged on an imaging surface IMA6. According to the first to ninth paragraphs of the

Embodiment

[0069] Table XVI is a table of relevant parameters of each lens of the wide-angle lens 6 in FIG. 26.

[0070] Table XVII is a table of relevant parameters of the aspherical surfaces of the aspherical lenses in Table XVI.

[0071] Table XVIII is a table of the relevant parameter values of the wide-angle lens 6 of the sixth embodiment and their calculated values corresponding to conditions (1) to (15). It can be seen from Table XVIII that the wide-angle lens 6 of the sixth embodiment can meet the requirements of conditions (1) to (15).

[0072] In addition, the optical performance of the wide-angle lens 6 of the sixth embodiment can also meet the requirements. As can be seen from FIG. 27, the field curvature of the wide-angle lens 6 of the sixth embodiment is between -0.04 mm and 0.05 mm. As can be seen from FIG. 28, the distortion of the wide-angle lens 6 of the sixth embodiment is between -18% and 0%. As can be seen from FIG. 29, the modulation transfer function value of the wide-angle lens 6 of the sixth embodiment is between 0.57 and 1.0. As can be seen from FIG. 30, for the wide-angle lens 6 of the sixth embodiment, when the focus offset is between -0.05 mm and 0.05 mm, the modulation transfer function value is between 0.0 and 0.86. It is obvious that the field curvature and distortion of the wide-angle lens 6 of the sixth embodiment can be effectively corrected, and the lens resolution and depth of focus can also meet the requirements, thereby obtaining better optical performance.

[0073] Although the present invention has been disclosed above in a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the appended patent application.

[0074] 1, 2, 3, 4, 5, 6: Wide-angle lens L11, L21, L31, L41, L51, L61: First lens L12, L22, L32, L42, L52, L62: Second lens L13, L23, L33, L43, L53, L63: Third lens L14, L24, L34, L44, L54, L64: Fourth lens L15, L25, L35, L45, L55, L65: Fifth lens L16, L26, L36, L46, L56, L66: Sixth lens IMA1, IMA2, IMA3, IMA4, IMA5, IMA6: Imaging surface ST1, ST2, ST3, ST4, ST5, ST6: Aperture OF1, OF2, OF3, OF4, OF5, OF6: Filter CG1, CG2, CG3, CG4, CG5, CG6: Protective glass OA1, OA2, OA3, OA4, OA5, OA6: Optical axis S11, S21, S31, S41, S51, S61: Object side surface of the first lens S12, S22, S32, S42, S52, S62: First lens image side S13, S23, S33, L43, S53, L63: Second lens object side S14, S24, S34, S44, S54, S64: Second lens image side S15, S25, S35, S45, S55, S65: Third lens object side S16, S26, S36, S46, S56, S66: Third lens image side S18, S28, S38, S48, S58, S68: Fourth lens object side S19, S29, S39, S49, S59, S69: Fourth lens image side S110, S210, S310, S410, S510, S610: Fifth lens object side S111, S211, S311, S411, S511, S611: Fifth lens image side S112, S212, S312, S412, S512, S612: Sixth lens object side S113, S213, S313, S413, S513, S613: Sixth lens image side S114, S214, S314, S414, S514, S614: Filter object side S115, S215, S315, S415, S515, S615: Filter image side S116, S216, S316, S416, S516, S616: Protective glass object side S117, S217, S317, S417, S517, S617: Protective glass image side S17, S27, S37, S47, S57, S67: Aperture surface

Claims

1. A wide-angle lens, comprising: A first lens has negative refractive power and includes a convex surface facing an object side; A second lens has negative refractive power, is a meniscus lens, and includes a convex surface facing the object side and a concave surface facing the image side; a third lens has refractive power, including a concave surface facing the object side; a fourth lens has positive refractive power; a fifth lens has refractive power, including a concave surface facing the object side and another concave surface facing the image side; and a sixth lens has refractive power; wherein the first, second, third, fourth, fifth, and sixth lenses are arranged sequentially along an optical axis from the object side to the image side; wherein the wide-angle lens satisfies at least one of the following conditions: 118.59TTL / T45172.47; 0.56(R11-R12) / TTL0.76; 0.6(R11-R12) / (R11+R12)0.7; wherein T45 is the distance from one image side of the fourth lens to one object side of the fifth lens. The wide-angle lens is defined as follows: TTL is the distance from the object side of the first lens to the imaging plane on the optical axis; R11 is the radius of curvature of the object side of the first lens; R12 is the radius of curvature of the image side of the first lens; and the wide-angle lens satisfies at least one of the following conditions: 1.17BFL / f = 1.65; 0.72f / (T12+T23) = 1.34; 0.55f / AAG = 0.93; where f is the effective focal length of the wide-angle lens, BFL is the distance from the image side of the sixth lens to the imaging plane on the optical axis, T12 is the air gap from the image side of the first lens to the object side of the second lens on the optical axis, T23 is the air gap from the image side of the second lens to the object side of the third lens on the optical axis, and AAG is the sum of the air gaps between the first lens and the sixth lens on the optical axis.

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

3. The wide-angle lens as described in claim 2, wherein the wide-angle lens satisfies at least one of the following conditions: 118.59TTL / T45172.47; 0.56(R11-R12) / TTL0.76; 0.6(R11-R12) / (R11+R12)0.7; 2.37mmd1+d2+d34.05mm; 1.17BFL / f1.65; 0.72f / (T12+T23)1.34; 0.55f / AAG0.93; wherein, T45 is the air gap on the optical axis between the image side surface of the fourth lens and the object side surface of the fifth lens; TTL is the gap on the optical axis between the object side surface of the first lens and an imaging plane; R11 is the radius of curvature of the object side surface of the first lens; R12 is the radius of curvature of the image side surface of the first lens; d1 is the gap on the optical axis between the object side surface of the first lens and the image side surface of the first lens; d2 is the gap on the optical axis between the object side surface of the second lens and the image side surface of the second lens; d3 is... The distance between the object side and the image side of the third lens on the optical axis, f is an effective focal length of the wide-angle lens, BFL is a distance between the image side and the imaging plane of the sixth lens on the optical axis, T12 is an air gap between the image side of the first lens and the object side of the second lens on the optical axis, T23 is an air gap between the image side of the second lens and the object side of the third lens on the optical axis, and AAG is the sum of the air gaps between the first lens and the sixth lens on the optical axis.

4. A wide-angle lens, comprising: A first lens has negative refractive power and includes a convex surface facing an object side; A second lens has refractive power; a third lens has refractive power and includes a convex surface facing the image side; a fourth lens has positive refractive power; a fifth lens has refractive power and includes a concave surface facing the image side; and a sixth lens has refractive power and includes a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged sequentially along an optical axis from the object side to the image side; wherein the wide-angle lens satisfies at least one of the following conditions: 118 .59TTL / T45172.47; 0.56(R11-R12) / TTL0.76; 0.6(R11-R12) / (R11+R12)0.7; 2.37mmd1+d2+d34.05mm; where T45 is the air gap on the optical axis between the image side of the fourth lens and the object side of the fifth lens, TTL is the distance on the optical axis between the object side of the first lens and an imaging plane, and R11 is the curvature of the object side of the first lens. The radius of curvature is defined as follows: R12 is the radius of curvature of one image-side surface of the first lens; d1 is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the first lens; d2 is the distance on the optical axis from the object-side surface of the second lens to the image-side surface of the second lens; d3 is the distance on the optical axis from the object-side surface of the third lens to the image-side surface of the third lens; wherein the wide-angle lens satisfies at least one of the following conditions: 1.17 BFL / f1.65; 0.72 f / (T12+T 23)1.34; 0.55f / AAG0.93; where f is one of the effective focal lengths of the wide-angle lens, BFL is the distance on the optical axis from the image side of the sixth lens to the imaging plane, T12 is the air gap on the optical axis from the image side of the first lens to the object side of the second lens, T23 is the air gap on the optical axis from the image side of the second lens to the object side of the third lens, and AAG is the sum of the air gaps on the optical axis between the first lens and the sixth lens.

5. The wide-angle lens as described in claim 4, wherein: The second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side; the third lens includes a concave surface facing the object side; and the fifth lens further includes a concave surface facing the object side.

6. The wide-angle lens as described in claim 4, wherein: The second lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side; the third lens includes a convex surface facing the object side; and the fifth lens further includes a concave surface facing the object side.

7. A wide-angle lens as described in claim 1, 2, or 4, wherein: The third lens has positive refractive power; the fifth lens has negative refractive power; and the sixth lens has positive refractive power.

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

9. The wide-angle lens as described in claim 1, 2 or 4, further comprising an aperture disposed between the third lens and the fourth lens.

10. A wide-angle lens as described in claim 1 or 2, wherein the wide-angle lens satisfies at least one of the following conditions: -18.8mm f1 + f2 -10.1mm; -1.4f4 / f50; 0.75f4 / f4560.95; 2Vd4 / Vd53.4; 2Vd6 / Vd53.3; 105Vd4 + Vd6130; 2.5TTL / BFL6.54; 7.2TTL / f8.6; 2.37mm d1 + d2 + d34.05mm; wherein, f is the effective focal length of the wide-angle lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f456 is the combined effective focal length of the fourth, fifth and sixth lenses, Vd4 is the Abbe coefficient of the fourth lens, Vd5 is the Abbe coefficient of the fifth lens, Vd6 is the Abbe coefficient of the sixth lens, TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, BFL is the distance from the image side of the sixth lens to the imaging plane on the optical axis, d1 is the distance from the object side of the first lens to the image side of the first lens on the optical axis, d2 is the distance from the object side of the second lens to the image side of the second lens on the optical axis, and d3 is the distance from the object side of the third lens to the image side of the third lens on the optical axis.

Images