wide-angle lens

Abstract

A wide-angle lens includes first, second, third, fourth and fifth lenses. The first lens has negative refractive power and includes a concave surface toward an image side, the second, third and fourth lenses have refractive power, the fourth lens includes a convex surface toward the image side, and the fifth lens has positive refractive power. The first, second, third, fourth and fifth lenses are arranged in order from an object side to the image side along an optical axis. The wide-angle lens satisfies at least one of the following conditions: 0.8 ≤ HIH / f ≤ 1.0; 10.9 ≤ TTL / HIH ≤ 12.1; 1.4 ≤ R12 / f ≤ 2.0; -7 ≤ R42 / f ≤ -4; where f is an effective focal length of the wide-angle lens, HIH is a half image height of the wide-angle lens, TTL is a distance on the optical axis from an object side surface of the first lens to an image plane, R12 is a radius of curvature of an image side surface of the first lens, and R42 is a radius of curvature of an image side surface of the fourth lens.

Description

Technical Field

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

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

[0003] The technical problem to be solved by the present invention is to provide a wide-angle lens that has a large field of view, a small aperture and a high resolution, while still having good optical performance, in order to address the shortcomings of existing wide-angle lenses that cannot simultaneously meet the requirements of a large field of view, a large aperture and a high resolution.

[0004] The technical solution adopted by this invention to solve its technical problem is to provide a wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has negative 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 refractive power and includes a convex surface facing the image side; and the fifth lens has positive refractive power. The first lens, second lens, third lens, fourth lens, and fifth lens are arranged sequentially along the optical axis from the object side to the image side. The wide-angle lens satisfies at least one of the following conditions: 0.8 ≤ HIH / f ≤ 1.0; 10.9 ≤ TTL / HIH ≤ 12.1; 1.4 ≤ R12 / f ≤ 2.0; -7 ≤ R42 / f ≤ -4; where f is the effective focal length of the wide-angle lens, HIH is the half-image height of the wide-angle lens, TTL is the distance between the object-side surface of the first lens and the image plane on the optical axis, R12 is the radius of curvature of the image-side surface of the first lens, and R42 is the radius of curvature of the image-side surface of the fourth lens. When the wide-angle lens of the present invention satisfies the above features and conditions without requiring other additional features or conditions, the basic function of the wide-angle lens of the present invention can be achieved.

[0005] The third lens is a meniscus lens with positive refractive power.

[0006] The first lens is a meniscus lens and may further include a convex surface facing the object; and the second lens includes a concave surface facing the object.

[0007] The third lens includes a concave surface facing the object side and a convex surface facing the image side; and the fifth lens includes a concave surface facing the image side.

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

[0009] The third lens has negative refractive power and includes a concave surface facing the object.

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

[0011] The first lens is a meniscus lens and may further include a convex surface facing the object side; the second lens includes a concave surface facing the object side; the third lens is a biconcave lens and may further include another concave surface facing the image side; the fourth lens is a biconvex lens and may further include another convex surface facing the object side; and the fifth lens includes a concave surface facing the image side.

[0012] The second lens has positive refractive power and includes a convex surface facing the image side; the fourth lens has positive refractive power; and the fifth lens includes a convex surface facing the object side.

[0013] The wide-angle lens of the present invention may further include an aperture disposed between the first lens and the third lens, and the wide-angle lens satisfies at least one of the following conditions: 1.04≤dsi / f5≤1.91; -2.2≤f1 / f≤-1.8; 3.2≤f5 / f≤6.1; wherein dsi is the distance from the aperture to the imaging plane on the optical axis, f is the effective focal length of the wide-angle lens, f1 is the effective focal length of the first lens, and f5 is the effective focal length of the fifth lens.

[0014] The wide-angle lens implementing the present invention has the following advantages: it has a large field of view, a small aperture value, and a high resolution, but still has good optical performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the lens configuration and optical path according to a first embodiment of the wide-angle lens of the present invention.

[0016] Figure 2 , 3 Figures 4 and 5 are respectively the field curvature diagram, distortion diagram, and spot diagram of the first embodiment of the wide-angle lens according to the present invention.

[0017] Figure 5 This is a schematic diagram of the lens configuration and optical path according to a second embodiment of the wide-angle lens of the present invention.

[0018] Figure 6 ,7 8 and 9 are respectively the field curvature diagram, distortion diagram, and spot diagram of the second embodiment of the wide-angle lens according to the present invention.

[0019] Figure 9 This is a schematic diagram of the lens configuration and optical path according to a third embodiment of the wide-angle lens of the present invention.

[0020] Figure 10 , 11 Figures 12 and 13 are, respectively, the field curvature diagram, distortion diagram, spot diagram, and modulation transfer function diagram of the third embodiment of the wide-angle lens according to the present invention. Detailed Implementation

[0021] This invention provides a wide-angle lens, comprising: a first lens having negative refractive power, the first lens including a concave surface facing the image side; a second lens having refractive power; a third lens having refractive power; a fourth lens having refractive power, the fourth lens including a convex surface facing the image side; and a fifth lens having positive refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are arranged sequentially along the optical axis from the object side to the image side; wherein the wide-angle lens satisfies at least one of the following conditions: 0.8≤HIH / f≤1.0; 10.9≤TTL / HIH≤12.1; 1.4≤R12 / f≤2.0; -7≤R42 / f≤-4; wherein f is the effective focal length of the wide-angle lens, HIH is the half-image height of the wide-angle lens, TTL is the distance from the object side surface of the first lens to the image plane on the optical axis, R12 is the radius of curvature of the image side surface of the first lens, and R42 is the radius of curvature of the image side surface of the fourth lens. When the wide-angle lens of the present invention satisfies the above-mentioned features and conditions, it is a preferred embodiment of the present invention.

[0022] Please refer to Tables 1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, and 17 below. Tables 1, 4, 7, 10, 13, and 16 are parameter tables for each lens according to the first to sixth embodiments of the wide-angle lens of the present invention. Tables 2, 5, 8, 11, 14, and 17 are parameter tables for the aspherical surface of the aspherical lens in Tables 1, 4, 7, 10, 13, and 16. In the following embodiments, the aspherical surface concavity z 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 +Eh12 +Fh 14 +Gh 16 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 G are the aspherical coefficients, which are expressed in scientific notation, for example, 2E-03 represents 2 × 10⁻⁶. -3 .

[0023] Figure 1 , 5 Figures 9 and 10 are schematic diagrams of lens configuration and optical path for the first, second, and third embodiments of the wide-angle lens of the present invention, respectively. Schematic diagrams of lens configuration and optical path for the fourth, fifth, and sixth embodiments of the wide-angle lens are omitted from the illustrations. However, in the following descriptions of the fourth, fifth, and sixth embodiments, the component symbols of the fourth, fifth, and sixth embodiments will continue to be used for ease of explanation. The first lenses L11, L21, L31, L41, L51, and L61 have negative refractive power and are made of glass. Their image-side surfaces S12, S22, S32, S42, S52, and S62 are concave, while their object-side surfaces S11, S21, S31, S41, S51, and S61, as well as their image-side surfaces S12, S22, S32, S42, S52, and S62, are all spherical surfaces.

[0024] The second lenses L12, L22, L32, L42, L52, and L62 have positive refractive power and are made of glass. Their image sides S14, S24, S34, S44, S54, and S65 are convex.

[0025] The third lenses L13, L23, L33, L43, L53, and L63 are made of glass.

[0026] The fourth lenses L14, L24, L34, L44, L54, and L64 have positive refractive power and are made of glass. Their image-side surfaces S19, S29, S39, S49, S58, and S69 are convex, while their object-side surfaces S18, S28, S38, S48, and S57 are spherical.

[0027] The fifth lenses L15, L25, L35, L45, L55, and L65 have positive refractive power and are made of glass. Their object sides S110, S210, S310, S410, S59, and S610 are convex.

[0028] In addition, wide-angle lenses 1, 2, 3, 4, 5, and 6 satisfy at least one of the following conditions (1) to (7):

[0029] 0.8≤HIH / f≤1.0; (1)

[0030] 10.9≤TTL / HIH≤12.1; (2)

[0031] -2.2≤f1 / f≤-1.8; (3)

[0032] 3.2≤f5 / f≤6.1; (4)

[0033] 1.4≤R12 / f≤2.0; (5)

[0034] -7≤R42 / f≤-4; (6)

[0035] 1.04≤dsi / f5≤1.91; (7)

[0036] Wherein, f is the effective focal length of wide-angle lenses 1, 2, 3, 4, 5, and 6 in the first to sixth embodiments; f1 is the effective focal length of first lenses L11, L21, L31, L41, L51, and L61 in the first to sixth embodiments; f5 is the effective focal length of fifth lenses L15, L25, L35, L45, L55, and L65 in the first to sixth embodiments; HIH is the half-image height of wide-angle lenses 1, 2, 3, 4, 5, and 6 in the first to sixth embodiments; and TTL is the distance from the object-side surfaces S11, S21, S31, S41, S51, and S61 of the first lenses L11, L21, L31, L41, L51, and L61 to the imaging surfaces IMA1, IMA2, IMA3, IMA4, IMA5, and IMA6 on the optical axis OA1 in the first to sixth embodiments. The spacing on OA2, OA3, OA4, OA5, and OA6; R12 is the radius of curvature of the image-side surfaces S12, S22, S32, S42, S52, and S62 of the first lenses L11, L21, L31, L41, L51, and L61 in the first to sixth embodiments; R42 is the radius of curvature of the image-side surfaces S19, S29, S39, S49, S58, and S69 of the fourth lenses L14, L24, L34, L44, L54, and L64 in the first to sixth embodiments; dsi is the spacing between the apertures ST1, ST2, ST3, ST4, ST5, and ST6 and the imaging surfaces IMA1, IMA2, IMA3, IMA4, IMA5, and IMA6 on the optical axes OA1, OA2, OA3, OA4, OA5, and OA6 in the first to sixth embodiments. This allows wide-angle lenses 1, 2, 3, 4, 5, and 6 to effectively improve the field of view, effectively improve resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0037] When condition (1) is met: 0.8≤HIH / f≤1.0, the total length of the lens can be effectively shortened to achieve a miniaturized configuration. When condition (2) is met: 10.9≤TTL / HIH≤12.1, the total length of the lens can be effectively shortened to achieve a miniaturized configuration. When condition (3) is met: -2.2≤f1 / f≤-1.8, sufficient negative refractive power can be effectively provided. When condition (4) is met: 3.2≤f5 / f≤6.1, a longer back focal length can be effectively provided. When condition (5) is met: 1.4≤R12 / f≤2.0, the correction ability for astigmatism and field curvature can be effectively improved. When condition (6) is met: -7≤R42 / f≤-4, the correction ability for astigmatism and field curvature can be effectively improved. When condition (7) is met: 1.04≤dsi / f5≤1.91, the principal ray angle of the imaging plane can be effectively controlled, and with the appropriate sensing components, better color performance can be achieved. When the first lens has negative refractive power, it can significantly reduce light intake to achieve a wide field of view. When the second lens has positive refractive power, it can effectively eliminate the distortion caused by the negative refractive power of the first lens. The third lens can be configured to have either positive or negative refractive power depending on the lens's residual aberrations, thereby improving the lens's optical structure correction flexibility. The fourth lens has positive refractive power and can balance the lens in front of the aperture to correct aberrations. The fifth lens has positive refractive power and can significantly adjust the principal ray angle of a wide-angle lens and correct field curvature.

[0038] The first embodiment of the wide-angle lens of the present invention will now be described in detail. The wide-angle lens 1, along the optical axis OA1 from the object side to the image side, sequentially 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 filter OF1, and a protective glass CG1. During imaging, light rays from the object side are finally imaged onto the imaging plane IMA1. According to paragraphs one through seven of the [Specific Implementation], wherein: the first lens L11 is a meniscus lens with its object-side surface S11 being convex; the second lens L12 is a meniscus lens with its object-side surface S13 being concave, and both the object-side surface S13 and the image-side surface S14 are aspherical surfaces; the third lens L13 is a meniscus lens with positive refractive power, its object-side surface S16 being concave, and its image-side surface S17 being convex, both of which are aspherical surfaces; the fourth lens L14 is a biconvex lens with its object-side surface S18 being convex and its image-side surface S19 being spherical. The fifth lens L15 is a meniscus lens, with its image-side surface S111 being concave and its object-side surface S110 and image-side surface S111 being spherical surfaces; the filter OF1 has its object-side surface S112 and image-side surface S113 being planar; the protective glass CG1 has its object-side surface S114 and image-side surface S115 being planar; by utilizing the above-mentioned lens, aperture ST1 and the design that satisfies at least one of conditions (1) to (7), the wide-angle lens 1 can effectively improve the field of view, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

[0039] Table 1 is... Figure 1 Table of relevant parameters for each lens in medium wide-angle lens 1.

[0040] Table 1

[0041]

[0042] Table 2 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 1.

[0043] Table 2

[0044]

[0045]

[0046] Table 3 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 (7). As can be seen from Table 3, the wide-angle lens 1 in the first embodiment can meet the requirements of conditions (1) to (7).

[0047] Table 3

[0048] HIH 3.13mm dsi 26.57mm HIH / f 0.89 TTL / HIH 12.01 f1 / f -2.17 f5 / f 4.54 R12 / f 1.68 R42 / f -6.85 dsi / f5 1.67

[0049] Furthermore, the optical performance of the wide-angle lens 1 in the first embodiment also meets the requirements. Figure 2 It can be seen that the field curvature of the wide-angle lens 1 in the first embodiment is between -0.02mm and 0.02mm. Figure 3 It can be seen that the distortion of the wide-angle lens 1 in the first embodiment is between -60% and 0%. Figure 4 As can be seen, in the wide-angle lens 1 of the first embodiment, when the image height is 0.000mm, the root mean square radius of the light spot is 3.393μm and the geometrical radius of the light spot is 8.209μm; when the image height is 0.781mm, the root mean square radius of the light spot is 2.381μm and the geometrical radius of the light spot is 5.762μm; when the image height is 1.563mm, the root mean square radius of the light spot is 2.357μm and the geometrical radius of the light spot is 4.594μm; when the image height is 2.344mm, the root mean square radius of the light spot is 4.129μm and the geometrical radius of the light spot is 8.045μm; and when the image height is 3.125mm, the root mean square radius of the light spot is 8.341μm and the geometrical radius of the light spot is 18.133μm. It is evident that the field curvature and distortion of the wide-angle lens 1 in the first embodiment can be effectively corrected, thereby obtaining better optical performance.

[0050] The second embodiment of the wide-angle lens of the present invention will now be described in detail. The wide-angle lens 2, along the optical axis OA2 from the object side to the image side, sequentially 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 filter OF2, and a protective glass CG2. During imaging, light rays from the object side are finally imaged onto the imaging surface IMA2. According to paragraphs one to seven of the [Detailed Embodiments], wherein: the first lens L21 is a meniscus lens, and its object-side surface S21 is convex; the second lens L22 is a meniscus lens, and its object-side surface S23 is concave, and both the object-side surface S23 and the image-side surface S24 are aspherical surfaces; the third lens L23 is a biconcave lens with negative refractive power, and its object-side surface S26 is concave, its image-side surface S27 is concave, and both the object-side surface S26 and the image-side surface S27 are aspherical surfaces; the fourth lens L24 is a biconvex lens, and its object-side surface S28 is convex, and its image-side surface S29 is spherical. The fifth lens L25 is a meniscus lens, with its image-side surface S211 being concave and its object-side surface S210 and image-side surface S211 both being spherical surfaces; the filter OF2 has its object-side surface S212 and image-side surface S213 both being planar; the protective glass CG2 has its object-side surface S214 and image-side surface S215 both being planar; by utilizing the above-mentioned lens, aperture ST2 and the design that satisfies at least one of conditions (1) to (7), the wide-angle lens 2 can effectively improve the field of view, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0051] Table 4 is... Figure 5 Table of relevant parameters for each lens in medium wide-angle lens 2.

[0052] Table 4

[0053]

[0054] Table 5 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 4.

[0055] Table 5

[0056]

[0057]

[0058] Table 6 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 (7). As can be seen from Table 6, the wide-angle lens 2 in the second embodiment can meet the requirements of conditions (1) to (7).

[0059] Table 6

[0060] HIH 3.13mm dsi 23.16mm HIH / f 0.89 TTL / HIH 11.77 f1 / f -2.13 f5 / f 4.45 R12 / f 1.60 R42 / f -4.97 dsi / f5 1.49

[0061] Furthermore, the optical performance of the wide-angle lens 2 in the second embodiment also meets the requirements. Figure 6 It can be seen that the field curvature of the wide-angle lens 2 in the second embodiment is between -0.01mm and 0.02mm. Figure 7 It can be seen that the distortion of the wide-angle lens 2 in the second embodiment is between -50% and 0%. Figure 8 As can be seen, in the wide-angle lens 2 of the second embodiment, when the image height is 0.000mm, the root mean square radius of the light spot is 3.654μm and the geometric radius of the light spot is 6.675μm; when the image height is 0.781mm, the root mean square radius of the light spot is 3.512μm and the geometric radius of the light spot is 8.817μm; when the image height is 1.563mm, the root mean square radius of the light spot is 2.722μm and the geometric radius of the light spot is 5.830μm; when the image height is 2.344mm, the root mean square radius of the light spot is 2.631μm and the geometric radius of the light spot is 4.987μm; and when the image height is 3.125mm, the root mean square radius of the light spot is 5.320μm and the geometric radius of the light spot is 11.574μm. Clearly, the field curvature and distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected, thus achieving better optical performance.

[0062] The third embodiment of the wide-angle lens of the present invention will now be described in detail. The wide-angle lens 3, along the optical axis OA3 from the object side to the image side, sequentially 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 filter OF3, and a protective glass CG3. During imaging, light rays from the object side are finally imaged onto the imaging surface IMA3. According to paragraphs one to seven of the [Detailed Embodiments], wherein: the first lens L31 is a biconcave lens, with its object-side surface S31 being concave; the second lens L32 is a biconvex lens, with its object-side surface S33 being convex, and both the object-side surface S33 and the image-side surface S34 are spherical surfaces; the third lens L33 is a meniscus lens with negative refractive power, with its object-side surface S36 being concave and its image-side surface S37 being convex, and both the object-side surface S36 and the image-side surface S37 are spherical surfaces; the fourth lens L34 is a meniscus lens, with its object-side surface S38 being concave and its image-side surface S39 being spherical. Surface; the fifth lens L35 is a biconvex lens, its image side S311 is a convex surface, and both the object side S310 and the image side S311 are aspherical surfaces; the filter OF3 has both the object side S312 and the image side S313 as flat surfaces; the protective glass CG3 has both the object side S314 and the image side S315 as flat surfaces; by utilizing the above lens, aperture ST3 and the design that satisfies at least one of conditions (1) to (7), the wide-angle lens 3 can effectively improve the field of view, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

[0063] Table 7 is... Figure 9Table of relevant parameters for each lens in the medium wide-angle lens 3.

[0064] Table 7

[0065]

[0066] Table 8 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 7.

[0067] Table 8

[0068]

[0069] Table 9 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 (7). As can be seen from Table 9, the wide-angle lens 3 in the third embodiment can meet the requirements of conditions (1) to (7).

[0070] Table 9

[0071]

[0072]

[0073] Furthermore, the optical performance of the wide-angle lens 3 in the third embodiment also meets the requirements. Figure 10 It can be seen that the field curvature of the wide-angle lens 3 in the third embodiment is between -0.01mm and 0.04mm. Figure 11 It can be seen that the distortion of the wide-angle lens 3 in the third embodiment is between -60% and 0%. Figure 12 It can be seen that, in the third embodiment, the wide-angle lens 3 has a root mean square radius of 2.521 μm and a geometric radius of 7.564 μm when the image height is 0.000 mm; a root mean square radius of 4.744 μm and a geometric radius of 19.652 μm when the image height is 2.293 mm; and a root mean square radius of 6.623 μm and a geometric radius of 39.657 μm when the image height is 3.275 mm. Figure 13 It can be seen that the modulation conversion function value of the wide-angle lens 3 in the third embodiment is between 0.68 and 1.0. Clearly, the field curvature and distortion of the wide-angle lens 3 in the third embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thus achieving better optical performance.

[0074] The fourth embodiment of the wide-angle lens of the present invention will now be described in detail. The wide-angle lens (not shown) includes, along the optical axis OA4, from the object side to the image side, a first lens L41, a second lens L42, an aperture ST4, a third lens L43, a fourth lens L44, a fifth lens L45, a filter OF4, and a protective glass CG4. During imaging, light rays from the object side are finally imaged onto the imaging plane IMA4. According to paragraphs one through seven of the [Specific Implementation], wherein: the first lens L41 is a meniscus lens with its object-side surface S41 being convex; the second lens L42 is a meniscus lens with its object-side surface S43 being concave, and both the object-side surface S43 and the image-side surface S44 are aspherical surfaces; the third lens L43 is a meniscus lens with positive refractive power, with its object-side surface S46 being convex and its image-side surface S47 being concave, and both the object-side surface S46 and the image-side surface S47 are aspherical surfaces; the fourth lens L44 is a biconvex lens with its object-side surface S48 being convex and its image-side surface S49 being spherical. Surface; the fifth lens L45 is a biconvex lens, its image side S411 is convex, and both the object side S410 and the image side S411 are spherical surfaces; the filter OF4 has both the object side S412 and the image side S413 as planes; the protective glass CG4 has both the object side S414 and the image side S415 as planes; by utilizing the above lens, aperture ST4 and the design that satisfies at least one of conditions (1) to (7), the wide-angle lens (not shown) can effectively improve the field of view, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

[0075] Table 10 shows the relevant parameters of each lens in the wide-angle lens 4 (not shown).

[0076] Table 10

[0077]

[0078]

[0079] Table 11 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 10.

[0080] Table 11

[0081]

[0082] Table 12 shows the relevant parameter values ​​of the wide-angle lens (not shown) in the fourth embodiment and the calculated values ​​of the corresponding conditions (1) to (7). As can be seen from Table 12, the wide-angle lens (not shown) in the fourth embodiment can meet the requirements of conditions (1) to (7).

[0083] Table 12

[0084] HIH 3.13mm dsi 20.80mm HIH / f 0.97 TTL / HIH 11.55 f1 / f -2.19 f5 / f 5.99 R12 / f 1.46 R42 / f -4.57 dsi / f5 1.08

[0085] The fifth embodiment of the wide-angle lens of the present invention will now be described in detail. The wide-angle lens (not shown) includes, along the optical axis OA5 from the object side to the image side, a first lens L51, a second lens L52, an aperture ST5, a third lens L53, a fourth lens L54, a fifth lens L55, a filter OF5, and a protective glass CG5. The third lens L53 and the fourth lens L54 are cemented together. During imaging, light rays from the object side are finally imaged onto the imaging plane IMA5. According to paragraphs one through seven of the [Specific Implementation], the first lens L51 is a biconcave lens with its object-side surface S51 being concave; the second lens L52 is a biconvex lens with its object-side surface S53 being convex, and both the object-side surface S53 and the image-side surface S54 are spherical surfaces; the third lens L53 is a biconcave lens with negative refractive power, with its object-side surface S56 being concave and its image-side surface S57 being concave, and both the object-side surface S56 and the image-side surface S57 are spherical surfaces; the fourth lens L54 is a biconvex lens with its object-side surface S57 being convex and its image-side surface S58 being spherical. The fifth lens L55 is a biconvex lens, with its image-side surface S510 being convex and its object-side surface S59 and image-side surface S510 being aspherical surfaces; the filter OF5 has its object-side surface S511 and image-side surface S512 being flat; the protective glass CG5 has its object-side surface S513 and image-side surface S514 being flat; by utilizing the above-mentioned lens, aperture ST5 and the design that satisfies at least one of conditions (1) to (7), the wide-angle lens (not shown) can effectively improve the field of view, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0086] Table 13 shows the relevant parameters of each lens in the wide-angle lens 5 (not shown).

[0087] Table Thirteen

[0088]

[0089] Table 14 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 13.

[0090] Table 14

[0091]

[0092]

[0093] Table 15 shows the relevant parameter values ​​of the wide-angle lens (not shown) in the fifth embodiment and the calculated values ​​of the corresponding conditions (1) to (7). As can be seen from Table 15, the wide-angle lens (not shown) in the fifth embodiment can meet the requirements of conditions (1) to (7).

[0094] Table 15

[0095] HIH 3.28mm dsi 21.22mm HIH / f 0.94 TTL / HIH 11.05 f1 / f -2.05 f5 / f 3.35 R12 / f 1.91 R42 / f -6.22 dsi / f5 1.82

[0096] The sixth embodiment of the wide-angle lens of the present invention will now be described in detail. The wide-angle lens (not shown) includes, along the optical axis OA6 from the object side to the image side, a first lens L61, an aperture ST6, a second lens L62, a third lens L63, a fourth lens L64, a fifth lens L65, a filter OF6, and a protective glass CG6. During imaging, light rays from the object side are finally imaged onto the imaging plane IMA6. According to paragraphs one through seven of the [Specific Implementation], the first lens L61 is a biconcave lens with its object-side surface S61 being concave; the second lens L62 is a biconvex lens with its object-side surface S64 being convex, and both the object-side surface S64 and the image-side surface S65 are spherical surfaces; the third lens L63 is a biconcave lens with negative refractive power, with its object-side surface S66 being concave and its image-side surface S67 being concave, and both the object-side surface S66 and the image-side surface S67 are spherical surfaces; the fourth lens L64 is a biconvex lens with its object-side surface S68 being convex, and both the object-side surface S68 and the image-side surface S69 are non-convex. Spherical surface; the fifth lens L65 is a biconvex lens, its image side S611 is convex, and both the object side S610 and the image side S611 are spherical surfaces; the filter OF6 has both the object side S612 and the image side S613 as planes; the protective glass CG6 has both the object side S614 and the image side S615 as planes; by utilizing the above lens, aperture ST6 and the design that satisfies at least one of conditions (1) to (7), the wide-angle lens (not shown) can effectively improve the field of view, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0097] Table 16 shows the relevant parameters of each lens in the wide-angle lens (not shown).

[0098] Table 16

[0099]

[0100]

[0101] Table 17 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 16.

[0102] Table 17

[0103]

[0104] Table 18 shows the relevant parameter values ​​of the wide-angle lens (not shown) in the sixth embodiment and the calculated values ​​of the corresponding conditions (1) to (7). As can be seen from Table 18, the wide-angle lens (not shown) in the sixth embodiment can meet the requirements of conditions (1) to (7).

[0105] Table 18

[0106] HIH 3.28mm dsi 26.12mm HIH / f 0.91 TTL / HIH 11.80 f1 / f -1.84 f5 / f 4.14 R12 / f 1.87 R42 / f -4.89 dsi / f5 1.75

[0107] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can 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 claims.

Claims

1. A wide-angle lens, characterized in that, include: The first lens has negative refractive power, and the first lens includes a concave surface facing the image side; The second lens has positive refractive power, and the second lens includes a convex surface facing the image side; The third lens has refractive power; The fourth lens has positive refractive power, and the fourth lens includes a convex surface facing the image side; and The fifth lens has positive refractive power and includes a convex surface facing the object side; The first lens, the second lens, the third lens, the fourth lens, and the fifth lens are arranged sequentially from the object side to the image side along the optical axis; The wide-angle lens satisfies at least one of the following conditions: 0.8 ≤ HIH / f ≤ 1.0; 10.9 ≤ TTL / HIH ≤ 12.1; 1.4 ≤ R12 / f ≤ 2.0; -7 ≤ R42 / f ≤ -4; Where f is the effective focal length of the wide-angle lens, HIH is the half-image height of the wide-angle lens, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, R12 is the radius of curvature of the image side surface of the first lens, and R42 is the radius of curvature of the image side surface of the fourth lens.

2. The wide-angle lens as described in claim 1, characterized in that, The third lens is a meniscus lens with positive refractive power.

3. The wide-angle lens as described in claim 2, characterized in that: The first lens is a meniscus lens, and further includes a convex surface facing the object; and The second lens includes a concave surface facing the object.

4. The wide-angle lens as described in claim 3, characterized in that: The third lens includes a concave surface facing the object side and a convex surface facing the image side; and The fifth lens includes a concave surface facing the image side.

5. The wide-angle lens as described in claim 3, characterized in that: The third lens includes a convex surface facing the object side and a concave surface facing the image side; and The fifth lens includes a convex surface facing the image side.

6. The wide-angle lens as described in claim 1, characterized in that, The third lens has negative refractive power and includes a concave surface facing the object.

7. The wide-angle lens as described in claim 6, characterized in that: The first lens is a biconcave lens, and further includes another concave surface facing the object side; The second lens includes a convex surface facing the object; and The fifth lens includes a convex surface facing the image side.

8. The wide-angle lens as described in claim 6, characterized in that: The first lens is a meniscus lens, and further includes a convex surface facing the object. The second lens includes a concave surface facing the object; The third lens is a biconcave lens, and further includes another concave surface facing the image side; The fourth lens is a biconvex lens, and further includes another convex surface facing the object; and The fifth lens includes a concave surface facing the image side.

9. The wide-angle lens as described in any one of claims 1 to 8, characterized in that, Furthermore, the aperture is positioned between the first lens and the third lens, and the wide-angle lens satisfies at least one of the following conditions: 1.04 ≤ dsi / f5 ≤ 1.91; -2.2 ≤ f1 / f ≤ -1.8; 3.2 ≤ f5 / f ≤ 6.1; Wherein, dsi is the distance from the aperture to the imaging plane on the optical axis, f is the effective focal length of the wide-angle lens, f1 is the effective focal length of the first lens, and f5 is the effective focal length of the fifth lens.

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