Wide-angle lens

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 comprises a convex surface facing the object side. The second lens has refractive power. The third lens element has refractive power. The fourth lens has positive refractive power. The fifth lens element has refractive power and includes a concave surface facing the image side. The sixth lens has refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth 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 and high resolution in response to different application requirements. The existing wide-angle lenses can no longer meet today's needs, and another new wide-angle lens structure is needed to meet the needs of large field of view, miniaturization and high resolution at the same time. Summary of the invention

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

[0004] In order to facilitate the expression of the parameters referred to in the present invention, the following are defined in the present specification and drawings: 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 lens, the fifth lens and the sixth lens, 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, T12 is the air distance on the optical axis from the image side surface of the first lens to the object side surface of the second lens, T23 is the air distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, T 45 is the air distance on the optical axis from the image side surface of the fourth lens to the object side surface of the fifth lens, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging plane, BFL is the distance on the optical axis from the image side surface of the sixth lens to the imaging plane, 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, AAG is the sum of the air distances on the optical axis between the first lens to the sixth lens, R11 is the curvature radius of the object side surface of the first lens, and R12 is the curvature radius of the image side surface 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 negative refractive power and includes a convex surface facing the 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 the image side. The sixth lens has 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 from the object side to the image side along the optical axis. 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 function of the wide-angle lens of the present invention can be achieved.

[0006] The present invention provides another 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 negative refractive power and includes a convex surface facing the 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 the image side. The third lens has refractive power. The fourth lens has 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. The sixth lens has 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 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.

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

[0008] The first lens is a meniscus lens and further includes 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] 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. The fifth lens further includes a concave surface facing the object side.

[0010] 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. The fifth lens further includes a concave surface facing the object side.

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

[0012] 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] 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] The wide-angle lens of the present invention has a larger field of view, a shorter total length of the lens, and a higher resolution, while still having good optical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of lens configuration and light path according to the first embodiment of the present invention.

[0016] Figure 2 , 3 , 4, and 5 are respectively a field curvature diagram, a distortion diagram, a modulation transfer function diagram, and a through focus modulation transfer function diagram according to the first embodiment of the present invention.

[0017] Figure 6 Schematic diagram of lens configuration and optical path according to the second embodiment of the present invention.

[0018] Figure 7 , 8 , 9 and 10 are respectively a field curvature diagram, a distortion diagram, a modulation transfer function diagram and a defocus modulation transfer function diagram according to the second embodiment of the present invention.

[0019] Fig.11 Schematic diagram of lens configuration and optical path according to the third embodiment of the present invention.

[0020] Fig.12 , 13 14 and 15 are respectively a field curvature diagram, a distortion diagram, a modulation transfer function diagram, and a defocus modulation transfer function diagram according to the third embodiment of the present invention.

[0021] Fig.16 Schematic diagram of lens configuration and optical path according to the fourth embodiment of the present invention.

[0022] Fig.17 , 18 , 19 and 20 are respectively a field curvature diagram, a distortion diagram, a modulation transfer function diagram and a defocus modulation transfer function diagram according to the fourth embodiment of the present invention.

[0023] Fig.21 Schematic diagram of lens configuration and light path according to the fifth embodiment of the present invention.

[0024] Fig. 22 , 23 , 24, and 25 are respectively a field curvature diagram, a distortion diagram, a modulation transfer function diagram, and a defocus modulation transfer function diagram according to the fifth embodiment of the present invention.

[0025] Fig.26 Schematic diagram of lens configuration and light path according to the sixth embodiment of the present invention.

[0026] Fig. 27 , 28 , 29, and 30 are respectively a field curvature diagram, a distortion diagram, a modulation transfer function diagram, and a defocus modulation transfer function diagram according to the sixth embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention provides a wide-angle lens, comprising: a first lens having negative refractive power, the first lens including a convex surface facing the object side; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power; a fifth lens having refractive power, the fifth lens including a concave surface facing the image side; and a sixth lens having 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 from the object side to the image side along the optical axis; wherein the wide-angle lens satisfies the following conditions: 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; 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.

[0028] The present invention provides another wide-angle lens, comprising: a first lens having negative refractive power and including a convex surface facing the object side; a second lens being a meniscus lens having refractive power and including a concave surface facing the object side and a convex surface facing the image side; a third lens having refractive power; a fourth lens having positive refractive power; a fifth lens being a meniscus lens having refractive power and including a convex surface facing the object side and a concave surface facing the image side; and a sixth lens having 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 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.

[0029] 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, wherein Table 1, Table 4, Table 7, Table 10, Table 13 and Table 16 are respectively tables of parameters of the lenses of the first embodiment to the sixth embodiment 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 respectively tables of parameters of the aspherical surface of the aspherical lens in Table 1, Table 4, Table 7, Table 10, Table 13 and Table 16. 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+Eh 12 +Fh 14 +Gh 16 +Hh 18 , 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, A~H are the aspheric coefficients, and the aspheric coefficients can be expressed in scientific notation, for example, 2E-03 represents 2×10 -3 .

[0030] Figure 1 , 6 , 11, 16, 21, 26 are respectively the lens configuration 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 lens L11, L21, L31, L41, L51, and L61 are meniscus lenses with negative refractive power, and their object-side surfaces S11, S21, S31, S41, S51, and S61 are convex surfaces, and the image-side surfaces S12, S22, S32, S42, S52, and S62 are concave surfaces, and the object-side surfaces S11, S21, S31, S41, S51, and S61 and the image-side surfaces S12, S22, S32, S42, S52, and S62 are all spherical surfaces.

[0031] The second lenses L12, L22, L32, L42, L52, and L62 have negative refractive power, and their object-side surfaces S13, S23, S33, S43, S53, and S63 and image-side surfaces S14, S24, S34, S44, S54, and S64 are all aspherical surfaces.

[0032] The third lenses L13, L23, L33, L43, L53 and L63 have positive refractive power, and their image-side surfaces S16, S26, S36, S46, S56 and S66 are convex surfaces.

[0033] The fourth lens L14, L24, L34, L44, L54, L64 is a biconvex lens with positive refractive power, whose object-side surfaces S18, S28, S38, S48, S58, S68 are convex surfaces, and image-side surfaces S19, S29, S39, S49, S59, S69 are convex surfaces, and the object-side surfaces S18, S28, S38, S48, S58, S68 and image-side surfaces S19, S29, S39, S49, S59, S69 are spherical surfaces.

[0034] The fifth lens L15, L25, L35, L45, L55 and L65 have negative refractive power, and the image-side surfaces S111, S211, S311, S411, S511 and S611 thereof are concave surfaces.

[0035] The sixth lens L16, L26, L36, L46, L56, L66 is a biconvex lens with positive refractive power, whose object-side surfaces S112, S212, S312, S412, S512, S612 are convex surfaces, and whose image-side surfaces S113, S213, S313, S413, S513, S613 are convex surfaces, and whose object-side surfaces S112, S212, S312, S412, S512, S612 and image-side surfaces S113, S213, S313, S413, S513, S613 are aspherical surfaces.

[0036] In addition, the wide-angle lenses 1, 2, 3, 4, 5, and 6 satisfy at least one of the following conditions (1) to (15):

[0037] -18.8 mm ≤ f1+f2 ≤ -10.1 mm; (1)

[0038] -1.4 ≤ f4 / f5 ≤ 0; (2)

[0039] 0.75 ≤ f4 / f456 ≤ 0.95; (3)

[0040] 2 ≤ Vd4 / Vd5 ≤ 3.4; (4)

[0041] 2 ≤ Vd6 / Vd5 ≤ 3.3; (5)

[0042] 105 ≤ Vd4+Vd6 ≤ 130; (6)

[0043] 2.5 ≤ TTL / BFL ≤ 6.54; (7)

[0044] 7.2 ≤ TTL / f ≤ 8.6; (8)

[0045] 1.17 ≤ BFL / f ≤ 1.65; (9)

[0046] 118.59 ≤ TTL / T45 ≤ 172.47; (10)

[0047] 0.72 ≤ f / (T12+T23) ≤ 1.34; (11)

[0048] 0.55 ≤ f / AAG ≤ 0.93; (12)

[0049] 0.56 ≤ (R11-R12) / TTL ≤ 0.76; (13)

[0050] 0.6 ≤ (R11-R12) / (R11+R12) ≤ 0.7; (14)

[0051] 2.37 mm ≤ d1+d2+d3 ≤ 4.05 mm; (15)

[0052] This allows wide-angle lenses 1, 2, 3, 4, 5, and 6 to effectively reduce the total length of the lens, effectively improve the resolution, and effectively correct aberrations.

[0053] When the condition (1) is met: -18.8mm≤f1+f2≤-10.1mm, the light collecting capacity can be effectively improved to increase the field of view. When the condition (2) is met: -1.4≤f4 / f5≤0, the resolution can be effectively improved. When the condition (3) is met: 0.75≤f4 / f456≤0.95, the tolerance sensitivity can be effectively reduced. When the condition (4) is met: 2≤Vd4 / Vd5≤3.4, the resolution can be effectively improved. When the condition (5) is met: 2≤Vd6 / Vd5≤3.3, the resolution can be effectively improved. When the condition (6) is met: 105≤Vd4+Vd6≤130, the resolution can be effectively improved. When the condition (7) is met: 2.5≤TTL / BFL≤6.54, the resolution can be effectively improved. When the condition (8) is met: 7.2≤TTL / f≤8.6, the total length of the lens can be effectively shortened. When condition (9) is met: 1.17≤BFL / f≤1.65, field curvature can be effectively reduced. When condition (10) is met: 118.59≤TTL / T45≤172.47, field curvature can be effectively reduced. When condition (11) is met: 0.72≤f / (T12+T23)≤1.34, field curvature can be effectively reduced. When condition (12) is met: 0.55≤f / AAG≤0.93, field curvature can be effectively reduced. When condition (13) is met: 0.56≤(R11-R12) / TTL≤0.76, field curvature can be effectively reduced. When condition (14) is met: 0.6≤(R11-R12) / (R11+R12)≤0.7, field curvature can be effectively reduced. When condition (15) is met: 2.37mm≤d1+d2+d3≤4.05mm, field curvature can be effectively reduced.

[0054] The first embodiment of the wide-angle lens of the present invention is now described in detail. The wide-angle lens 1 includes a first lens L11, a second lens L12, a third lens L13, an aperture ST1, a fourth lens L14, a fifth lens L15, a sixth lens L16, a filter OF1 and a protective glass CG1 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 second lens L12 is a meniscus lens, whose object side surface S13 is concave and whose image side surface S14 is convex; the third lens L13 is a biconvex lens, whose object side surface S15 is convex, whose object side surface S15 is a spherical surface, and whose image side surface S16 is a spherical surface; the fifth lens L15 is a meniscus lens, whose object side surface S110 is convex, whose object side surface S110 is a spherical surface, and whose image side surface S111 is a spherical surface; the object side surface S114 and the image side surface S115 of the filter OF1 are both planes; the object side surface S116 and the image side surface S117 of the protective glass CG1 are both planes; by using the above-mentioned lenses, aperture ST1 and the design that satisfies at least one of conditions (1) to (15), the wide-angle lens 1 can effectively reduce the total length of the lens, effectively improve the resolution, and effectively correct the aberration. When the wide-angle lens of the present invention only meets the conditions (10), (11) and the refractive surface characteristics in the independent items, the basic actuation requirements can be met.

[0055] Table 1 Figure 1 Table of relevant parameters of each lens of medium wide angle lens 1.

[0056] Table 1

[0057]

[0058]

[0059] Table 2 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 1.

[0060] Table 2

[0061]

[0062] 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 (15). 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 (15).

[0063] Table 3

[0064] f456 7.34mm BFL 6.13mm AAG 4.67mm T12 2.89mm T23 0.10mm T45 0.10mm d1 0.50mm d2 0.94mm d3 1.20mm f1+f2 -17.72mm f4 / f5 -1.03 f4 / f456 0.80 Vd4 / Vd5 3.04 Vd6 / Vd5 3.11 Vd4+Vd6 110.66 TTL / BFL 2.78 TTL / f 4.32 BFL / f 1.56 (R11-R12) / (R11+R12) 0.65 f / (T12+T23) 1.31 f / AAG 0.84 (R11-R12) / TTL 0.59 TTL / T45 170.00 d1+d2+d3 2.64mm

[0065] In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements. Figure 2It 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 3 It can be seen that the distortion of the wide-angle lens 1 of the first embodiment is between -35% and 0%. Figure 4 It can be seen that the modulation transfer function value of the wide-angle lens 1 of the first embodiment is between 0.52 and 1.0. As shown in FIG. 5, when the focus offset of the wide-angle lens 1 of the first embodiment is between -0.05mm and 0.05mm, the modulation transfer function value of the wide-angle lens 1 of the first embodiment is between 0.0 and 0.86. It is obvious that the field curvature and distortion of the wide-angle lens 1 of the first embodiment can be effectively corrected, and the lens resolution and focal depth can also meet the requirements, thereby obtaining better optical performance.

[0066] The second embodiment of the wide-angle lens of the present invention is now described in detail. The wide-angle lens 2 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 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 second lens L22 is a meniscus lens, whose object side surface S23 is concave and whose image side surface S24 is convex; the third lens L23 is a biconvex lens, whose object side surface S25 is convex, whose object side surface S25 is a spherical surface, and whose image side surface S26 is a spherical surface; the fifth lens L25 is a biconcave lens, whose object side surface S210 is concave, whose object side surface S210 is a spherical surface, and whose image side surface S211 is a spherical surface; the object side surface S214 and the image side surface S215 of the filter OF2 are both planes; the object side surface S216 and the image side surface S217 of the protective glass CG2 are both planes; by using the above-mentioned lenses, aperture ST2 and the design that satisfies at least one of conditions (1) to (15), the wide-angle lens 2 can effectively reduce the total length of the lens, effectively improve the resolution, and effectively correct the aberration. When the wide-angle lens of the present invention only meets the conditions (11), (13) and the refractive surface characteristics in the independent items, the basic actuation requirements can be met.

[0067] Table 4 is Figure 6 Table of relevant parameters of each lens of medium wide angle lens 2.

[0068] Table 4

[0069]

[0070]

[0071] Table 5 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 4.

[0072] Table 5

[0073]

[0074] 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 (15). 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 (15).

[0075] Table 6

[0076] f456 7.13mm BFL 6.37mm AAG 4.33mm T12 2.98mm T23 0.10mm T45 0.10mm d1 0.50mm d2 0.77mm d3 1.18mm f1+f2 -13.39mm f4 / f5 -1.18 f4 / f456 0.93 Vd4 / Vd5 3.04 Vd6 / Vd5 3.11 Vd4+Vd6 110.67 TTL / BFL 2.67 TTL / f 4.31 BFL / f 1.62 (R11-R12) / (R11+R12) 0.66 f / (T12+T23) 1.28 f / AAG 0.91 (R11-R12) / TTL 0.65 TTL / T45 170.02 d1+d2+d3 2.45mm

[0077] In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements. Figure 7 It can be seen that the field curvature of the wide-angle lens 2 of the second embodiment is between -0.02mm and 0.045mm. Figure 8 It can be seen that the distortion of the wide-angle lens 2 of the second embodiment is between -40% and 0%. Fig. 9 It can be seen that the modulation transfer function value of the wide-angle lens 2 of the second embodiment is between 0.54 and 1.0. Fig.10 It can be seen that, for the wide-angle lens 2 of the second embodiment, when the focus offset is between -0.05mm and 0.05mm, 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 2 of the second embodiment can be effectively corrected, and the lens resolution and focal depth can also meet the requirements, thereby obtaining better optical performance.

[0078] The third embodiment of the wide-angle lens of the present invention is now described in detail. The wide-angle lens 3 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 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 second lens L32 is a meniscus lens, whose object side surface S33 is concave and whose image side surface S34 is convex; the third lens L33 is a biconvex lens, whose object side surface S35 is convex, whose object side surface S35 is a spherical surface, and whose image side surface S36 is a spherical surface; the fifth lens L35 is a meniscus lens, whose object side surface S310 is convex, whose object side surface S310 is a spherical surface, and whose image side surface S311 is a spherical surface; the object side surface S314 and the image side surface S315 of the filter OF3 are both planes; the object side surface S316 and the image side surface S317 of the protective glass CG3 are both planes; by using the above-mentioned lenses, aperture ST3 and the design that satisfies at least one of conditions (1) to (15), the wide-angle lens 3 can effectively reduce the total length of the lens, effectively improve the resolution, and effectively correct the aberration. When the wide-angle lens of the present invention only meets the conditions (12), (14) and the refractive surface characteristics in the independent items, the basic actuation requirements can be met.

[0079] Table 7 Fig.11 Table of relevant parameters of each lens of the medium wide-angle lens 3.

[0080] Table 7

[0081]

[0082]

[0083] Table 8 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 7.

[0084] Table 8

[0085]

[0086] 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 (15). 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 (15).

[0087] Table 9

[0088] f456 7.61mm BFL 6.09mm AAG 4.75mm T12 2.86mm T23 0.15mm T45 0.14mm d1 0.50mm d2 0.97mm d3 1.25mm f1+f2 -18.38mm f4 / f5 -1.07 f4 / f456 0.85 Vd4 / Vd5 2.91 Vd6 / Vd5 3.20 Vd4+Vd6 106.84 TTL / BFL 2.79 TTL / f 4.31 BFL / f 1.55 (R11-R12) / (R11+R12) 0.65 f / (T12+T23) 1.31 f / AAG 0.83 (R11-R12) / TTL 0.58 TTL / T45 121.04 d1+d2+d3 2.71mm

[0089] In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements. Fig.12It can be seen that the field curvature of the wide-angle lens 3 of the third embodiment is between -0.04mm and 0.045mm. Fig.13 It can be seen that the distortion of the wide-angle lens 3 of the third embodiment is between -40% and 0%. Fig.14 It can be seen that the modulation transfer function value of the wide-angle lens 3 of the third embodiment is between 0.49 and 1.0. Fig.15 It can be seen that, for the wide-angle lens 3 of the third embodiment, when the focus offset is between -0.05mm and 0.05mm, the modulation transfer function value is between 0.0 and 0.84. It is obvious that the field curvature and distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected, and the lens resolution and focal depth can also meet the requirements, thereby obtaining better optical performance.

[0090] The fourth embodiment of the wide-angle lens of the present invention is now described in detail. The wide-angle lens 4 includes a first lens L41, a second lens L42, a third lens L43, an aperture ST4, a fourth lens L44, a fifth lens L45, a sixth lens L46, a filter OF4 and a protective glass CG4 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 eleventh paragraphs of [Specific Implementation], the second lens L42 is a meniscus lens, whose object side surface S43 is convex and whose image side surface S44 is concave; the third lens L43 is a meniscus lens, whose object side surface S45 is concave, whose object side surface S45 is an aspherical surface, and whose image side surface S46 is an aspherical surface; the fifth lens L45 is a biconcave lens, whose object side surface S410 is concave, whose object side surface S410 is an aspherical surface, and whose image side surface S411 is an aspherical surface; the object side surface S414 and the image side surface S415 of the filter OF4 are both planes; the object side surface S416 and the image side surface S417 of the protective glass CG4 are both planes; by using the above-mentioned lenses, aperture ST4 and the design that satisfies at least one of conditions (1) to (15), the wide-angle lens 4 can effectively reduce the total length of the lens, effectively improve the resolution, and effectively correct the aberration. When the wide-angle lens of the present invention only meets the conditions (9), (15) and the refractive surface characteristics in the independent items, the basic actuation requirements can be met.

[0091] Table 10 Fig.16 Table of relevant parameters of each lens of the medium wide angle lens 4.

[0092] Table 10

[0093]

[0094] Table 11 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 10.

[0095] Table 11

[0096]

[0097] 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 (15). 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 (15).

[0098] Table 12

[0099] f456 4.54mm BFL 2.71mm AAG 3.11mm T12 0.70mm T23 1.67mm T45 0.12mm d1 1.59mm d2 0.51mm d3 1.84mm f1+f2 -10.56mm f4 / f5 -1.36 f4 / f456 0.78 Vd4 / Vd5 3.37 Vd6 / Vd5 2.75 Vd4+Vd6 124.63 TTL / BFL 5.46 TTL / f 8.34 BFL / f 1.53 (R11-R12) / (R11+R12) 0.67 f / (T12+T23) 0.75 f / AAG 0.57 (R11-R12) / TTL 0.68 TTL / T45 124.62 d1+d2+d3 3.94mm

[0100] In addition, the optical performance of the wide-angle lens 4 of the fourth embodiment can also meet the requirements. Fig.17 It can be seen that the field curvature of the wide-angle lens 4 of the fourth embodiment is between -0.20mm and -0.02mm. Fig.18 It can be seen that the distortion of the wide-angle lens 4 of the fourth embodiment is between -9% and 4%. Fig.19 It can be seen that the modulation transfer function value of the wide-angle lens 4 of the fourth embodiment is between 0.45 and 1.0. Fig. 20 It can be seen that, for the wide-angle lens 4 of the fourth embodiment, when the focus offset is between -0.05mm and 0.05mm, the modulation transfer function value is between 0.0 and 0.82. It is obvious that the field curvature and distortion of the wide-angle lens 4 of the fourth embodiment can be effectively corrected, and the lens resolution and focal depth can also meet the requirements, thereby obtaining better optical performance.

[0101] The fifth embodiment of the wide-angle lens of the present invention is now described in detail. The wide-angle lens 5 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 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 eleventh paragraphs of [Specific Implementation], the second lens L52 is a meniscus lens, whose object side surface S53 is convex and whose image side surface S54 is concave; the third lens L53 is a meniscus lens, whose object side surface S55 is concave, whose object side surface S55 is an aspherical surface, and whose image side surface S56 is an aspherical surface; the fifth lens L55 is a biconcave lens, whose object side surface S510 is concave, whose object side surface S510 is an aspherical surface, and whose image side surface S511 is an aspherical surface; the object side surface S514 and the image side surface S515 of the filter OF5 are both planes; the object side surface S516 and the image side surface S517 of the protective glass CG5 are both planes; by using the above-mentioned lenses, aperture ST5 and the design that satisfies at least one of conditions (1) to (15), the wide-angle lens 5 can effectively reduce the total length of the lens, effectively improve the resolution, and effectively correct the aberration.

[0102] Table 13 Fig.21 Table of relevant parameters of each lens of medium wide angle lens 5.

[0103] Table 13

[0104]

[0105]

[0106] Table 14 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 13.

[0107] Table 14

[0108]

[0109] 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 (15). 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 (15).

[0110] Table 15

[0111] f456 4.01mm BFL 2.99mm AAG 2.84mm T12 0.36mm T23 1.74mm T45 0.09mm d1 1.58mm d2 0.72mm d3 1.67mm f1+f2 -15.00mm f4 / f5 -1.04 f4 / f456 0.89 Vd4 / Vd5 3.37 Vd6 / Vd5 2.75 Vd4+Vd6 124.63 TTL / BFL 5.02 TTL / f 7.84 BFL / f 1.56 (R11-R12) / (R11+R12) 0.62 f / (T12+T23) 0.91 f / AAG 0.68 (R11-R12) / TTL 0.61 TTL / T45 161.58 d1+d2+d3 3.97mm

[0112] In addition, the optical performance of the wide-angle lens 5 of the fifth embodiment can also meet the requirements. Fig. 22 It can be seen that the field curvature of the wide-angle lens 5 of the fifth embodiment is between -0.03mm and 0.03mm. Fig.23 It can be seen that the distortion of the wide-angle lens 5 of the fifth embodiment is between -16% and 2%. Fig.24 It can be seen that the modulation transfer function value of the wide-angle lens 5 of the fifth embodiment is between 0.54 and 1.0. Fig.25 It can be seen that, 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. It is obvious that the field curvature and distortion of the wide-angle lens 5 of the fifth embodiment can be effectively corrected, and the lens resolution and focal depth can also meet the requirements, thereby obtaining better optical performance.

[0113] The sixth embodiment of the wide-angle lens of the present invention is now described in detail. The wide-angle lens 6 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 in order from the object side to the image side along the optical axis OA6. When imaging, the light from the object side is finally imaged on the imaging surface IMA6. According to the first to eleventh paragraphs of [Specific Implementation], the second lens L62 is a meniscus lens, whose object side surface S63 is convex and whose image side surface S64 is concave; the third lens L63 is a meniscus lens, whose object side surface S65 is concave, whose object side surface S65 is an aspherical surface, and whose image side surface S66 is an aspherical surface; the fifth lens L65 is a biconcave lens, whose object side surface S610 is concave, whose object side surface S610 is an aspherical surface, and whose image side surface S611 is an aspherical surface; the object side surface S614 and the image side surface S615 of the filter OF6 are both planes; the object side surface S616 and the image side surface S617 of the protective glass CG6 are both planes; by using the above-mentioned lenses, aperture ST6 and a design that satisfies at least one of conditions (1) to (15), the wide-angle lens 6 can effectively reduce the total length of the lens, effectively improve the resolution, and effectively correct the aberration.

[0114] Table 16 is a table of relevant parameters of each lens of the wide-angle lens 6 in Figure 26.

[0115] Table 16

[0116]

[0117]

[0118] Table 17 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 16.

[0119] Table 17

[0120]

[0121] Table 18 shows the relevant parameter values ​​of the wide-angle lens 6 of the sixth embodiment and the calculated values ​​corresponding to conditions (1) to (15). It can be seen from Table 18 that the wide-angle lens 6 of the sixth embodiment can meet the requirements of conditions (1) to (15).

[0122] Table 18

[0123] f456 3.95mm BFL 2.38mm AAG 3.18mm T12 0.90mm T23 1.43mm T45 0.09mm d1 1.88mm d2 0.64mm d3 1.38mm f1+f2 -13.66mm f4 / f5 -0.88 f4 / f456 0.77 Vd4 / Vd5 3.29 Vd6 / Vd5 2.75 Vd4+Vd6 123.01 TTL / BFL 6.36 TTL / f 7.61 BFL / f 1.20 (R11-R12) / (R11+R12) 0.66 f / (T12+T23) 0.85 f / AAG 0.62 (R11-R12) / TTL 0.72 TTL / T45 164.81 d1+d2+d3 3.91mm

[0124] In addition, the optical performance of the wide-angle lens 6 of the sixth embodiment can also meet the requirements. Fig. 27 It can be seen that the field curvature of the wide-angle lens 6 of the sixth embodiment is between -0.04mm and 0.05mm. Fig.28It can be seen that the distortion of the wide-angle lens 6 of the sixth embodiment is between -18% and 0%. Fig.29 It can be seen that the modulation transfer function value of the wide-angle lens 6 of the sixth embodiment is between 0.57 and 1.0. Fig.30 It can be seen that, 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 focal depth can also meet the requirements, thereby obtaining better optical performance.

[0125] 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 negative refractive power and includes a convex surface facing the object side; The second lens has a refractive power; The third lens has refractive power; The fourth lens element has positive refractive power; The fifth lens has refractive power and includes a concave surface facing the image side; as well as 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 from the object side to the image side along the optical axis; 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; Wherein, T45 is the air distance between the image side surface of the fourth lens and the object side surface of the fifth lens on the optical axis, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, R11 is the curvature radius of the object side surface of the first lens, R12 is the curvature radius of the image side surface of the first lens, d1 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, d2 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 d3 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; 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; Wherein, f is the effective focal length of the wide-angle lens, BFL is the distance from the image side surface of the sixth lens to the imaging surface on the optical axis, T12 is the air distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, T23 is the air distance from the image side surface of the second lens to the object side surface of the third lens on the optical axis, and AAG is the sum of the air distances between the first lens and the sixth lens on the optical axis.

2. A wide-angle lens, characterized in that: 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 negative refractive power and includes a convex surface facing the object side; The second lens is a meniscus lens having refractive power and comprising a concave surface facing the object side and a convex surface facing the image side; The third lens has refractive power; The fourth lens has positive refractive power; The fifth lens is a meniscus lens having refractive power and comprising a convex surface facing the object side and a concave surface facing the image side; and wherein the sixth lens has 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 from the object side to the image side along the optical axis.

3. The wide-angle lens according to any one of claims 1 or 2, characterized in that: The second lens has negative refractive power; The third lens has positive refractive power; The fifth lens has negative refractive power; and The sixth lens has positive refractive power.

4. The wide-angle lens according to claim 3, characterized in that: The first lens is a meniscus lens and further comprises a concave surface facing the image side; The third lens comprises 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.

5. The wide-angle lens according to claim 3, characterized in that: 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 comprises 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 according to claim 3, characterized in that: 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 comprises a convex surface facing the object side; and The fifth lens further includes a concave surface facing the object side.

7. The wide-angle lens according to any one of claims 1 or 2, characterized in that: The invention further comprises an aperture disposed between the third lens and the fourth lens.

8. The wide-angle lens according to any one of claims 1 or 2, characterized in that: The wide-angle lens meets 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; 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 lens, the fifth lens and the sixth lens, 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 surface of the first lens to the imaging surface on the optical axis, and BFL is the distance from the image side surface of the sixth lens to the imaging surface on the optical axis.

9. The wide-angle lens according to claim 2, wherein: The wide-angle lens meets 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; Wherein, T45 is the air distance between the image side surface of the fourth lens and the object side surface of the fifth lens on the optical axis, TTL is the distance between the object side surface of the first lens and the imaging plane on the optical axis, R11 is the curvature radius of the object side surface of the first lens, R12 is the curvature radius of the image side surface of the first lens, d1 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, d2 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, d3 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, f is the effective focal length of the wide-angle lens, BFL is the distance between the image side surface of the sixth lens and the imaging plane on the optical axis, 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, T23 is the air distance between the image side surface of the second lens and the object side surface of the third lens on the optical axis, and AAG is the sum of the air distances between the first lens and the sixth lens on the optical axis.

Images