Camera lens

Abstract

The present invention provides a camera lens, which can meet the requirements of low back and low F value and has good optical characteristics. The camera lens comprises, from the object side to the image side, a first lens L1 with positive optical power; a second lens L2; ​​a third lens L3; a fourth lens L4; a fifth lens L5 with positive optical power; a sixth lens L6; and a seventh lens L7 with negative optical power; the first lens has a convex surface facing the object side in the paraxial zone, and the fifth lens has a convex surface facing the image side in the paraxial zone, satisfying a predetermined conditional formula.

Description

Technical Field

[0001] The present invention relates to an imaging lens for forming an image of a subject on a solid-state imaging element of a CCD sensor or a C-MOS sensor used in an imaging device. Background Art

[0002] In recent years, camera functions have been widely installed in various products such as home appliances, information terminals, and automobiles. It is expected that the development of products incorporating camera functions will continue in the future.

[0003] The imaging lens installed in such equipment needs to be compact and have high resolution performance.

[0004] As an imaging lens that aims at improving performance in the related art, for example, an imaging lens disclosed in Patent Document 1 below is known.

[0005] Patent document 1 (CN110346902A) discloses a camera lens, which includes, from the object side, in sequence: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and a seventh lens; the relationship between the focal length of the first lens and the focal length of the entire camera lens system, the refractive index of the second lens, the relationship between the focal length of the third lens and the focal length of the fourth lens, the relationship between the paraxial curvature radius of the object side surface of the seventh lens and the paraxial curvature radius of the image side surface of the seventh lens, and the refractive index of the fifth lens meet certain conditions. Summary of the invention

[0006] Problem that the invention aims to solve

[0007] When attempting to achieve low profile and low F value by using the lens structure described in Patent Document 1, it is very difficult to correct aberrations in the peripheral portion, and good optical performance cannot be obtained.

[0008] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an imaging lens having a high resolution that satisfies the requirements for low profile and low F-number in a balanced manner and that satisfies various aberrations with good correction.

[0009] Furthermore, regarding the terms used in the present invention, the convex surface, concave surface, and plane surface of the lens surface refer to the shape near the optical axis (paraxial). The optical power refers to the optical power near the optical axis (paraxial). The pole refers to the point on the aspheric surface other than the optical axis where the tangent plane intersects the optical axis perpendicularly. The total optical length refers to the distance on the optical axis from the object side of the optical element located closest to the object side to the imaging surface. In addition, the total optical length and the back focal length are distances obtained by converting the thickness of the IR cutoff filter or protective glass disposed between the imaging lens and the imaging surface into air.

[0010] Means used to solve problems

[0011] The camera lens of the present invention comprises, from the object side to the image side, a first lens having positive optical focal length; a second lens; a third lens; a fourth lens; a fifth lens having positive optical focal length; a sixth lens; and a seventh lens having negative optical focal length; the first lens has a convex surface facing the object side in the paraxial zone, and the fifth lens has a convex surface facing the image side in the paraxial zone.

[0012] By having the first lens having positive power and having both surfaces formed so as to be aspherical with a convex surface in a paraxial region facing the object side, spherical aberration, coma, astigmatism, field curvature and distortion are suppressed.

[0013] Since both surfaces of the second lens are aspherical, coma, astigmatism, field curvature, and distortion are corrected well.

[0014] Since both surfaces of the third lens are aspherical, coma, astigmatism, and distortion are corrected well.

[0015] Since both surfaces of the fourth lens are aspherical, coma, astigmatism, and distortion are corrected well.

[0016] Since the fifth lens has positive power and both surfaces are aspherical and the convex surface is directed toward the image side in the paraxial region, astigmatism, field curvature and distortion are well corrected.

[0017] Since both surfaces of the sixth lens are aspherical, coma, astigmatism, field curvature and distortion are corrected well.

[0018] Since the seventh lens has negative power and both surfaces thereof are aspherical, chromatic aberration, astigmatism, field curvature and distortion are corrected well.

[0019] In the imaging lens having the above configuration, it is preferred that the image side surface of the “first lens” be concave toward the image side in the paraxial region.

[0020] By making the image-side surface of the first lens element concave toward the image side in the paraxial region, astigmatism, field curvature and distortion can be corrected well.

[0021] In addition, in the imaging lens of the above structure, it is preferred that the object side surface of the "sixth lens" is convex toward the object side in the paraxial region.

[0022] By making the object-side surface of the sixth lens element convex toward the object side in the paraxial region, coma, astigmatism, field curvature and distortion can be corrected well.

[0023] In the imaging lens having the above configuration, it is preferable that the object-side surface of the sixth lens is formed as an aspherical surface having a pole at a position other than on the optical axis.

[0024] By forming the object-side surface of the sixth lens element as an aspherical surface having a pole at a position other than the optical axis, astigmatism, field curvature and distortion can be corrected more effectively.

[0025] In the imaging lens of the above structure, it is preferred that the "sixth lens" has a concave surface facing the object side in the paraxial region.

[0026] By making the image-side surface of the sixth lens element concave toward the image side in the paraxial region, coma, astigmatism, field curvature and distortion can be corrected well.

[0027] In the imaging lens having the above configuration, it is preferable that the image side surface of the sixth lens is formed as an aspherical surface having a pole at a position other than on the optical axis.

[0028] By forming the image-side surface of the sixth lens as an aspherical surface having a pole at a position other than the optical axis, astigmatism, field curvature and distortion can be corrected more effectively.

[0029] By adopting the above structure, the imaging lens of the present invention can achieve a low profile with an overall aspect ratio (ratio of the overall optical length to the diagonal length of the effective imaging surface of the imaging element) of 0.80 or less, and a low F value of 2.1 or less.

[0030] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (1) is satisfied:

[0031] (1) 13.0<νd3<33.5

[0032] in,

[0033] νd3: The dispersion coefficient of the third lens with respect to the d-line.

[0034] By satisfying the range of conditional expression (1), chromatic aberration can be corrected well.

[0035] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (2) is satisfied:

[0036] (2) 13.0<νd4<31.0

[0037] in,

[0038] νd4: The dispersion coefficient of the fourth lens with respect to the d-line.

[0039] By satisfying the range of conditional expression (2), chromatic aberration can be corrected well.

[0040] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (3) is satisfied:

[0041] (3)-3.00<|r13| / f7<-0.25

[0042] in,

[0043] r13: paraxial radius of curvature of the object side of the seventh lens,

[0044] f7: focal length of the seventh lens.

[0045] By satisfying the range of conditional expression (3), chromatic aberration, astigmatism, field curvature, and distortion can be corrected well.

[0046] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (4) is satisfied:

[0047] (4) 2.2mm<f5×T4

[0048] in,

[0049] f5: focal length of the fifth lens,

[0050] T4: The distance on the optical axis from the image side surface of the fourth lens to the object side surface of the fifth lens.

[0051] By satisfying the range of conditional expression (4), astigmatism, field curvature, and distortion can be corrected well.

[0052] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (5) is satisfied:

[0053] (5)1.7<r12 / |r9|×|r6|<18.0

[0054] in,

[0055] r12: paraxial curvature radius of the image side of the sixth lens,

[0056] r9: the paraxial radius of curvature of the object side of the fifth lens,

[0057] r6: paraxial radius of curvature of the image-side surface of the third lens.

[0058] By satisfying the range of conditional expression (5), coma, astigmatism, field curvature, and distortion can be corrected well.

[0059] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (6) is satisfied:

[0060] (6)3.4<|f4| / f<31.0

[0061] in,

[0062] f4: focal length of the fourth lens,

[0063] f: Focal length of the entire camera lens system.

[0064] By satisfying the range of conditional expression (6), coma, astigmatism, and distortion can be corrected well.

[0065] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (7) is satisfied:

[0066] (7) 0.1<r2 / |r6|<1.5

[0067] in,

[0068] r2: paraxial radius of curvature of the image side of the first lens,

[0069] r6: paraxial radius of curvature of the image-side surface of the third lens.

[0070] By satisfying the range of conditional expression (7), coma, astigmatism, field curvature, and distortion can be corrected well.

[0071] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (8) is satisfied:

[0072] (8)0.1<|r6 / r7|<5.0

[0073] in,

[0074] r6: paraxial curvature radius of the image side of the third lens,

[0075] r7: paraxial radius of curvature of the object side of the fourth lens.

[0076] By satisfying the range of conditional expression (8), coma, astigmatism, and distortion can be corrected well.

[0077] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (9) is satisfied:

[0078] (9)0.8<|r7| / f<7.0

[0079] in,

[0080] r7: the paraxial radius of curvature of the object side of the fourth lens,

[0081] f: Focal length of the entire camera lens system.

[0082] By satisfying the range of conditional expression (9), coma, astigmatism, and distortion can be corrected well.

[0083] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (10) is satisfied:

[0084] (10)1.2<|r8| / f<35.0

[0085] in,

[0086] r8: paraxial curvature radius of the image side of the fourth lens,

[0087] f: Focal length of the entire camera lens system.

[0088] By satisfying the range of conditional expression (10), coma, astigmatism, and distortion can be corrected well.

[0089] In the imaging lens of the above structure, it is preferable that the following conditional expression (11) is satisfied: (11) -0.75 < r10 / f5 < 0.00

[0090] in,

[0091] r10: paraxial radius of curvature of the image side of the fifth lens,

[0092] f5: Focal length of the fifth lens.

[0093] By satisfying the range of conditional expression (11), astigmatism, field curvature, and distortion can be corrected well.

[0094] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (12) is satisfied:

[0095] (12)1.4<f5 / f

[0096] in,

[0097] f5: focal length of the fifth lens,

[0098] f: Focal length of the entire camera lens system.

[0099] By satisfying the range of conditional expression (12), astigmatism, field curvature, and distortion can be corrected well.

[0100] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (13) is satisfied:

[0101] (13)0.00<|f4| / f5<7.25

[0102] in,

[0103] f4: focal length of the fourth lens,

[0104] f5: Focal length of the fifth lens.

[0105] By satisfying the range of conditional expression (13), coma, astigmatism, field curvature, and distortion can be corrected well.

[0106] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (14) is satisfied:

[0107] (14)-1.15<|f4| / f5 / f7<0.00

[0108] in,

[0109] f4: focal length of the fourth lens,

[0110] f5: focal length of the fifth lens,

[0111] f7: focal length of the seventh lens.

[0112] By satisfying the range of conditional expression (14), chromatic aberration, coma, astigmatism, field curvature, and distortion can be corrected well.

[0113] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (15) is satisfied:

[0114] (15) -1.25<f7 / f<-0.30

[0115] in,

[0116] f7: focal length of the seventh lens,

[0117] f: Focal length of the entire camera lens system.

[0118] By satisfying the range of conditional expression (15), chromatic aberration, astigmatism, field curvature, and distortion can be corrected well.

[0119] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (16) is satisfied:

[0120] (16)0.3<|r4| / f<11.0

[0121] in,

[0122] r4: paraxial curvature radius of the image side of the second lens,

[0123] f: Focal length of the entire camera lens system.

[0124] By satisfying the range of conditional expression (16), coma, astigmatism, field curvature, and distortion can be corrected well.

[0125] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (17) is satisfied:

[0126] (17) 0.05<r4 / r5<6.00

[0127] in,

[0128] r4: paraxial curvature radius of the image side of the second lens,

[0129] r5: paraxial radius of curvature of the object side of the third lens.

[0130] By satisfying the range of conditional expression (17), coma, astigmatism, field curvature, and distortion can be corrected well.

[0131] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (18) is satisfied:

[0132] (18)0.65<|r6| / f<8.00

[0133] in,

[0134] r6: paraxial curvature radius of the image side of the third lens,

[0135] f: Focal length of the entire camera lens system.

[0136] By satisfying the range of conditional expression (18), coma, astigmatism, and distortion can be corrected well.

[0137] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (19) is satisfied:

[0138] (19)-4.0<r10 / f<-0.2

[0139] in,

[0140] r10: paraxial radius of curvature of the image side of the fifth lens,

[0141] f: Focal length of the entire camera lens system.

[0142] By satisfying the range of conditional expression (19), astigmatism, field curvature, and distortion can be corrected well.

[0143] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (20) is satisfied:

[0144] (20)0.05<r12 / |r9|<1.25

[0145] in,

[0146] r12: paraxial curvature radius of the image side of the sixth lens,

[0147] r9: paraxial radius of curvature of the object side of the fifth lens.

[0148] By satisfying the range of conditional expression (20), coma, astigmatism, field curvature, and distortion can be corrected well.

[0149] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (21) is satisfied:

[0150] (21)0.25<r12 / |r13|<3.50

[0151] in,

[0152] r12: paraxial curvature radius of the image side of the sixth lens,

[0153] r13: paraxial radius of curvature of the object side of the seventh lens.

[0154] By satisfying the range of conditional expression (21), coma, astigmatism, field curvature, and distortion can be corrected well.

[0155] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (22) is satisfied:

[0156] (22)2.0<|r13| / D7<27.5

[0157] in,

[0158] r13: paraxial radius of curvature of the object side of the seventh lens,

[0159] D7: The thickness of the seventh lens on the optical axis.

[0160] By satisfying the range of conditional expression (22), a low profile can be achieved, and astigmatism, field curvature, and distortion can be corrected well.

[0161] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (23) is satisfied:

[0162] (23)-31.0<|r14| / f7<-0.2

[0163] in,

[0164] r14: paraxial curvature radius of the image side of the seventh lens,

[0165] f7: focal length of the seventh lens.

[0166] By satisfying the range of conditional expression (23), chromatic aberration, astigmatism, field curvature, and distortion can be corrected well.

[0167] According to the present invention, it is possible to obtain an imaging lens that satisfies the requirements of low profile and low F value in a balanced manner, corrects various aberrations well, and has high resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0168] Figure 1 It is a diagram showing a schematic structure of an imaging lens according to Example 1 of the present invention.

[0169] Figure 2 These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 1 of the present invention.

[0170] Figure 3 A diagram schematically showing the structure of an imaging lens according to Example 2 of the present invention.

[0171] Figure 4These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 2 of the present invention.

[0172] Figure 5 A diagram schematically showing the structure of an imaging lens according to Example 3 of the present invention.

[0173] Figure 6 These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 3 of the present invention.

[0174] Figure 7 A diagram schematically showing the structure of an imaging lens according to Example 4 of the present invention.

[0175] Figure 8 These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 4 of the present invention.

[0176] Fig. 9 A diagram schematically showing the structure of an imaging lens according to Example 5 of the present invention.

[0177] Fig.10 These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 5 of the present invention. DETAILED DESCRIPTION

[0178] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0179] Figure 1 , Figure 3 , Figure 5 , Figure 7 and Fig. 9 The schematic configuration diagrams of imaging lenses according to Examples 1 to 5 of the embodiments of the present invention are shown below. Figure 1 Embodiments of the present invention will be described in detail.

[0180] like Figure 1 As shown, the camera lens of the present invention comprises, from the object side toward the image side, the following components:

[0181] The first lens L1 has positive refractive power and a convex surface facing the object side in the paraxial region;

[0182] Second lens L2; ​​third lens L3; fourth lens L4;

[0183] The fifth lens L5 has positive refractive power and has a convex surface facing the image side in the paraxial region;

[0184] Sixth lens L6;

[0185] And the seventh lens L7 has negative refractive power.

[0186] An infrared cut filter, a protective glass or other filter IR is disposed between the seventh lens L7 and the imaging plane IMG (ie, the imaging plane of the imaging element). The filter IR may be omitted.

[0187] The aperture stop ST is disposed between the first lens L1 and the second lens L2, so that distortion correction is easy. In addition, the position of the aperture stop ST is not limited to between the first lens L1 and the second lens L2. It can be appropriately disposed according to the specifications of the imaging element.

[0188] The first lens L1 has positive power and is in a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in the paraxial region, and both surfaces thereof are formed aspherical surfaces, so that spherical aberration, coma, astigmatism, field curvature and distortion are suppressed.

[0189] The second lens L2 has positive refractive power and is in a meniscus shape with a concave surface facing the object side and a convex surface facing the image side in the paraxial zone, and both surfaces are aspherical, so as to achieve low profile and well correct coma, astigmatism, field curvature and distortion.

[0190] In addition, if Figure 3 As shown in Example 2, the second lens L2 may also have negative refractive power, which is beneficial for correcting chromatic aberration.

[0191] In addition, if Figure 3 , Figure 5 and Figure 7 As shown in the examples 2, 3 and 4, the shape of the second lens L2 can also be a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in the paraxial region. In this case, it is beneficial to correct coma, astigmatism, field curvature and distortion. In addition, as Fig. 9 As shown in Example 5, the second lens L2 may also be a biconvex shape with a convex surface facing the object side and a convex surface facing the image side in the paraxial region. In this case, both surfaces have positive refractive power, which is beneficial for low-profile.

[0192] The third lens L3 has negative refractive power and is biconcave in a paraxial region with a concave surface facing the object side and a concave surface facing the image side, and both surfaces are aspherical, thereby properly correcting chromatic aberration, coma, astigmatism and distortion.

[0193] In addition, if Figure 3 As shown in Example 2, the refractive power of the third lens L3 may be set to a positive value. In this case, it is advantageous for achieving a low profile.

[0194] In addition, if Figure 3 , Figure 5 and Figure 7As shown in the examples 2, 3 and 4, the shape of the third lens L3 can also be a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in the paraxial region. In this case, it is beneficial to correct coma, astigmatism and distortion. In addition, Fig. 9 As shown in Example 5, the shape of the third lens L3 can also be a meniscus shape with a concave surface facing the object side and a convex surface facing the image side in the paraxial region. In this case, it is beneficial to correct coma, astigmatism and distortion.

[0195] The fourth lens L4 has negative power, has a biconcave shape with a concave surface facing the object side and a concave surface facing the image side in the paraxial region, and both surfaces thereof are formed aspherical, so that chromatic aberration, coma, astigmatism and distortion are corrected well.

[0196] In addition, if Figure 3 , Figure 5 , Figure 7 and Fig. 9 As shown in Examples 2, 3, 4 and 5, the refractive power of the fourth lens L4 may be a positive value. In this case, it is advantageous for achieving a low profile.

[0197] In addition, if Figure 3 , Figure 5 and Figure 7 As shown in the examples 2, 3 and 4, the shape of the fourth lens L4 can also be a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in the paraxial region. In this case, it is beneficial to correct coma, astigmatism and distortion. In addition, Fig. 9 As shown in Example 5, the shape of the fourth lens L4 can also be a meniscus shape with a concave surface facing the object side and a convex surface facing the image side in the paraxial region. In this case, it is beneficial to correct coma, astigmatism and distortion.

[0198] The fifth lens L5 has positive power and is in a meniscus shape with a concave surface facing the object side and a convex surface facing the image side in the paraxial region, and both surfaces thereof are formed aspherical, so as to satisfactorily correct astigmatism, field curvature and distortion.

[0199] In addition, if Figure 3 As shown in Example 2, the fifth lens L5 may also be a biconvex shape with a convex surface facing the object side in the paraxial region and a convex surface facing the image side. In this case, both surfaces have positive refractive power, which is beneficial for low-profile.

[0200] The sixth lens L6 has positive power and is in a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in the paraxial zone, and both surfaces thereof are formed aspherical surfaces, so that coma, astigmatism, field curvature and distortion are well corrected.

[0201] In addition, if Figure 5 , Figure 7 and Fig. 9As shown in Examples 3, 4 and 5, the refractive power of the sixth lens L6 may be set to a negative value. In this case, it is advantageous to correct chromatic aberration.

[0202] In addition, by forming the object-side surface of the sixth lens L6 as an aspherical surface having a pole at a position other than on the optical axis, astigmatism, field curvature, and distortion can be corrected favorably.

[0203] Furthermore, by forming the image-side surface of the sixth lens L6 as an aspherical surface having a pole at a position other than on the optical axis X, astigmatism, field curvature, and distortion can be corrected more favorably.

[0204] The seventh lens L7 has negative power and is in a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in the paraxial zone, and both surfaces thereof are formed aspherical, so that chromatic aberration, astigmatism, field curvature and distortion are well corrected.

[0205] In addition, if Figure 3 and Figure 5 As shown in Examples 2 and 3, the seventh lens L7 may also be in a biconcave shape with a concave surface facing the object side and a concave surface facing the image side in the paraxial region. In this case, negative refractive power on both sides is beneficial to the correction of chromatic aberration.

[0206] In addition, if Figure 7 As shown in Example 4, the shape of the seventh lens L7 can also be a meniscus shape with a concave surface facing the object side and a convex surface facing the image side in the paraxial region. In this case, it is beneficial to correct astigmatism, field curvature and distortion.

[0207] In the camera lens of this embodiment, it is preferred that all lenses from the first lens L1 to the seventh lens L7 are composed of respective single lenses. Composed of only single lenses, more aspheric surfaces can be used. In this embodiment, by forming all lens surfaces into appropriate aspheric surfaces, various aberrations can be corrected well. In addition, compared with the case of using a cemented lens, since the man-hours can be reduced, it can be manufactured at a low cost.

[0208] Furthermore, the imaging lens of this embodiment uses plastic material for all lenses, so that the manufacturing is easy and mass production is possible at low cost.

[0209] In addition, the lens material used is not limited to plastic materials. By adopting glass materials, higher performance can also be expected. In addition, it is preferred that all lens surfaces are formed as aspherical surfaces, but spherical surfaces that are easy to manufacture can also be adopted according to the required performance.

[0210] The imaging lens in this embodiment satisfies the following conditional expressions (1) to (23), thereby achieving favorable effects.

[0211] (1) 13.0<νd3<33.5

[0212] (2)13.0<νd4<31.0

[0213] (3)-3.00<|r13| / f7<-0.25

[0214] (4)2.2mm<f5×T4

[0215] (5)1.7<r12 / |r9|×|r6|<18.0

[0216] (6)3.4<|f4| / f<31.0

[0217] (7)0.1<r2 / |r6|<1.5

[0218] (8)0.1<|r6 / r7|<5.0

[0219] (9)0.8<|r7| / f<7.0

[0220] (10)1.2<|r8| / f<35.0

[0221] (11)-0.75<r10 / f5<0.00

[0222] (12)1.4<f5 / f

[0223] (13)0.00<|f4| / f5<7.25

[0224] (14)-1.15<|f4| / f5 / f7<0.00

[0225] (15)-1.25<f7 / f<-0.30

[0226] (16)0.3<|r4| / f<11.0

[0227] (17)0.05<r4 / r5<6.00

[0228] (18)0.65<|r6| / f<8.00

[0229] (19)-4.0<r10 / f<-0.2

[0230] (20)0.05<r12 / |r9|<1.25

[0231] (21)0.25<r12 / |r13|<3.50

[0232] (22)2.0<|r13| / D7<27.5

[0233] (23)-31.0<|r14| / f7<-0.2

[0234] in,

[0235] νd3: dispersion coefficient of the third lens L3 with respect to the d-line,

[0236] νd4: dispersion coefficient of the fourth lens L4 with respect to the d-line,

[0237] D7: thickness of the seventh lens L7 on the optical axis X,

[0238] T4: the distance on the optical axis X from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5,

[0239] f: focal length of the entire camera lens system,

[0240] f4: focal length of the fourth lens L4,

[0241] f5: focal length of the fifth lens L5,

[0242] f7: focal length of the seventh lens L7,

[0243] r2: paraxial curvature radius of the image side surface of the first lens L1,

[0244] r4: paraxial curvature radius of the image side surface of the second lens L2,

[0245] r5: paraxial radius of curvature of the object side of the third lens L3,

[0246] r6: paraxial curvature radius of the image side surface of the third lens L3,

[0247] r7: paraxial radius of curvature of the object side of the fourth lens L4,

[0248] r8: paraxial curvature radius of the image side surface of the fourth lens L4,

[0249] r9: paraxial radius of curvature of the object side of the fifth lens L5,

[0250] r10: paraxial curvature radius of the image side surface of the fifth lens L5,

[0251] r12: paraxial curvature radius of the image side surface of the sixth lens L6,

[0252] r13: paraxial curvature radius of the object side of the seventh lens L7,

[0253] r14: paraxial curvature radius of the image-side surface of the seventh lens L7.

[0254] It is not necessary to satisfy all of the above-mentioned conditional expressions, and by satisfying each conditional expression individually, the effects corresponding to each conditional expression can be obtained.

[0255] Furthermore, the imaging lens in this embodiment satisfies the following conditional expressions (1a) to (23a), thereby achieving better effects.

[0256] (1a)16.0<νd3<29.5

[0257] (2a)16.0<νd4<27.0

[0258] (3a)-2.5<|r13| / f7<-0.4

[0259] (4a)2.9mm<f5×T4<3000.0mm

[0260] (5a)2.1<r12 / |r9|×|r6|<15.0

[0261] (6a)4.0<|f4| / f<14.5

[0262] (7a) 0.15<r2 / |r6|<1.25

[0263] (8a) 0.15<|r6 / r7|<4.00

[0264] (9a)1.2<|r7| / f<5.5

[0265] (10a)1.4<|r8| / f<24.0

[0266] (11a)-0.7<r10 / f5<0.0

[0267] (12a)1.5<f5 / f<1000.0

[0268] (13a)0.01<|f4| / f5<6.75

[0269] (14a)-1.11<|f4| / f5 / f7<0.00

[0270] (15a)-1.15<f7 / f<-0.50

[0271] (16a)0.5<|r4| / f<9.0

[0272] (17a) 0.1<r4 / r5<4.0

[0273] (18a)0.7<|r6| / f<6.5

[0274] (19a)-3.5<r10 / f<-0.3

[0275] (20a)0.15<r12 / |r9|<1.00

[0276] (21a)0.35<r12 / |r13|<2.80

[0277] (22a)3.5<|r13| / D7<22.5

[0278] (23a)-25.0<|r14| / f7<-0.3

[0279] The symbols of each conditional expression are the same as those described in the previous paragraph. In addition, only the lower limit value or upper limit value of conditional expressions (1a) to (234a) can be applied to the corresponding conditional expressions (1) to (234a).

[0280] In this embodiment, the aspheric shape used on the aspheric surface of the lens surface is expressed by mathematical formula 1 when the axis in the optical axis direction is set to Z, the height in the direction perpendicular to the optical axis is set to H, the near-axis curvature radius is set to R, the cone coefficient is set to k, and the aspheric coefficient is set to A4, A6, A8, A10, A12, A14, A16, A18, and A20.

[0281] [Mathematical formula 1]

[0282]

[0283] Next, examples of the imaging lens involved in this embodiment are shown. In each example, f represents the focal length of the entire imaging lens system, Fno represents the F value, ω represents the half field of view, ih represents the maximum image height, and TTL represents the total optical length. In addition, i represents the surface number from the object side, r represents the paraxial curvature radius, d represents the distance between the lens surfaces on the optical axis (surface spacing), Nd represents the refractive index of the d-line (reference wavelength), and νd represents the dispersion coefficient relative to the d-line. In addition, for aspherical surfaces, the symbol * (asterisk) is added after the surface number i to represent it.

[0284] [Example 1]

[0285] Basic lens data are shown in Table 1 below.

[0286] [Table 1]

[0287] Example 1

[0288] Unit: mm

[0289] f=4.92

[0290] Fno=1.80

[0291] ω(°)=47.2

[0292] ih=5.23

[0293] TTL=6.96

[0294] Area data

[0295]

[0296] Image plane

[0297] Composition lens data

[0298]

[0299] Aspheric surface data

[0300]

[0301] The imaging lens of Example 1 achieves an overall aspect ratio of 0.66 and an F value of 1.80.

[0302] As shown in Table 6, conditional expressions (1) to (23) are satisfied.

[0303] Figure 2 The spherical aberration (mm), astigmatism (mm), and distortion (%) are shown for the imaging lens of Example 1. The spherical aberration diagram shows the aberration amount for each wavelength of the F line (486nm), d line (588nm), and C line (656nm). In addition, the astigmatism diagram shows the aberration amount of the d line on the sagittal image plane S (solid line) and the aberration amount of the d line on the meridional image plane T (dashed line). Figure 4 , Figure 6 , Figure 8 and Fig.10 are the same in the examples. Figure 2 As shown, it can be seen that each aberration is well corrected.

[0304] [Example 2]

[0305] Basic lens data are shown in Table 2 below.

[0306] [Table 2]

[0307] Example 2

[0308] Unit: mm

[0309] f=6.72

[0310] Fno=1.80

[0311] ω(°)=39.4

[0312] ih=5.60

[0313] TTL=7.43

[0314] Area data

[0315]

[0316] Image plane

[0317] Composition lens data

[0318]

[0319] Aspheric surface data

[0320]

[0321] The imaging lens of Example 2 achieves an overall aspect ratio of 0.66 and an F value of 1.80.

[0322] As shown in Table 18, conditional expressions (1) to (23) are satisfied.

[0323] Figure 4 For the imaging lens of Example 2, spherical aberration (mm), astigmatism (mm), and distortion (%) are shown. Figure 4 As shown, it can be seen that each aberration is well corrected.

[0324] [Example 3]

[0325] Basic lens data are shown in Table 3 below.

[0326] [Table 3]

[0327] Example 3

[0328] Unit: mm

[0329] f=6.72

[0330] Fno=1.90

[0331] ω(°)=39.2

[0332] ih=5.60

[0333] TTL=7.73

[0334] Area data

[0335]

[0336] Image plane

[0337] Composition lens data

[0338]

[0339] Aspheric surface data

[0340]

[0341] The imaging lens of Example 3 achieves an overall aspect ratio of 0.69 and an F value of 1.90.

[0342] As shown in Table 18, conditional expressions (1) to (23) are satisfied.

[0343] Figure 6 For the imaging lens of Example 3, spherical aberration (mm), astigmatism (mm), and distortion (%) are shown. Figure 6 As shown, it can be seen that each aberration is well corrected.

[0344] [Example 4]

[0345] Basic lens data are shown in Table 4 below.

[0346] [Table 4]

[0347] Example 4

[0348] Unit: mm

[0349] f=6.72

[0350] Fno=1.80

[0351] ω(°)=39.2

[0352] ih=5.60

[0353] TTL=7.73

[0354] Area data

[0355]

[0356] Image plane

[0357] Composition lens data

[0358]

[0359] Aspheric surface data

[0360]

[0361] The imaging lens of Example 4 achieves an overall aspect ratio of 0.69 and an F value of 1.80.

[0362] As shown in Table 6, conditional expressions (1) to (23) are satisfied.

[0363] Figure 8 For the imaging lens of Example 4, spherical aberration (mm), astigmatism (mm), and distortion (%) are shown. Figure 8 As shown, it can be seen that each aberration is well corrected.

[0364] [Example 5]

[0365] Basic lens data are shown in Table 5 below.

[0366] [Table 5]

[0367] Example 5

[0368] Unit: mm

[0369] f=7.16

[0370] Fno=1.94

[0371] ω(°)=48.4

[0372] ih=7.93

[0373] TTL=8.24

[0374] Area data

[0375]

[0376] Image plane

[0377] Composition lens data

[0378]

[0379] Aspheric surface data

[0380]

[0381] The imaging lens of Example 5 achieves an overall aspect ratio of 0.52 and an F value of 1.94.

[0382] As shown in Table 6, conditional expressions (1) to (23) are satisfied.

[0383] Fig.10 For the imaging lens of Example 5, spherical aberration (mm), astigmatism (mm), and distortion (%) are shown. Fig.10 As shown, it can be seen that each aberration is well corrected.

[0384] Table 6 shows the values ​​of conditional expressions (1) to (23) according to Examples 1 to 5.

[0385] [Table 6]

[0386]

[0387] Industrial Applicability

[0388] When the imaging lens according to the present invention is applied to a product with a camera function, it can contribute to a lower profile and a lower F value of the camera, and can also achieve higher performance of the camera.

[0389] Description of Reference Numerals

[0390] ST Aperture Stop,

[0391] L1 first lens,

[0392] L2 Second lens,

[0393] L3 third lens,

[0394] L4 fourth lens,

[0395] L5 fifth lens,

[0396] L6 Sixth lens,

[0397] L7 seventh lens,

[0398] IR filter,

[0399] IMG camera surface.

Claims

1. A camera lens, characterized in that: From the object side to the image side, it is composed of: A first lens having positive optical power; Second lens; The third lens; The fourth lens; a fifth lens having positive optical power; The sixth lens; as well as a seventh lens having negative optical power; The first lens has a convex surface facing the object side in the paraxial zone, and the fifth lens has a convex surface facing the image side in the paraxial zone, and the following conditional equations (1), (2), (3), (4), (5), (6), (11), (12) and (13) are satisfied: (1) 13.0<νd3<33.5 (2) 13.0<νd4<31.0 (3)-3.00＜|r13| / f7＜-0.25 (4)2.2mm 2 <f5×T4 (5)1.7mm<r12 / |r9|×|r6|<18.0mm (6)3.4<|f4| / f<31.0 (11)-0.75＜r10 / f5＜0.00 (12)1.4<f5 / f (13)0.00<|f4| / f5<7.25 in, νd3: dispersion coefficient of the third lens relative to the d-line, νd4: dispersion coefficient of the fourth lens relative to the d-line, r13: paraxial radius of curvature of the object side of the seventh lens, f7: focal length of the seventh lens, f5: focal length of the fifth lens, T4: The distance on the optical axis from the image side of the fourth lens to the object side of the fifth lens, r12: paraxial curvature radius of the image side of the sixth lens, r9: the paraxial radius of curvature of the object side of the fifth lens, r6: paraxial curvature radius of the image side of the third lens, f4: focal length of the fourth lens, f: focal length of the entire camera lens system, r10: paraxial curvature radius of the image-side surface of the fifth lens.

2. The imaging lens according to claim 1, wherein: The following condition (7) is satisfied: (7)0.1＜r2 / |r6|＜1.5 in, r2: paraxial radius of curvature of the image side of the first lens, r6: paraxial radius of curvature of the image-side surface of the third lens.

3. The imaging lens according to claim 1, wherein: The following condition (8) is satisfied: (8)0.1＜|r6 / r7|＜5.0 in, r6: paraxial curvature radius of the image side of the third lens; r7: paraxial radius of curvature of the object side of the fourth lens.

4. The imaging lens according to claim 1, wherein: The following condition (9) is satisfied: (9)0.8＜|r7| / f＜7.0 in, r7: the paraxial radius of curvature of the object side of the fourth lens, f: Focal length of the entire camera lens system.

5. The imaging lens according to claim 1, wherein: The following condition (10) is satisfied: (10)1.2＜|r8| / f＜35.0 in, r8: paraxial curvature radius of the image side of the fourth lens, f: Focal length of the entire camera lens system.

Images