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 includes, from the object side to the image side, a first lens, which is a biconvex shape with a convex surface in the paraxial area facing the object side and has a positive optical focal length; a second lens, which has a convex surface in the paraxial area facing the object side and has a negative optical focal length; a third lens, which has a concave surface in the paraxial area facing the image side and has a positive optical focal length; a fourth lens, which has a positive optical focal length in the paraxial area; and a fifth lens, which has a concave surface in the paraxial area facing the object side and has a negative optical focal length; and a predetermined conditional formula is satisfied.

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 (China Patent Gazette No. 109298514) discloses a camera lens, which includes, from the object side, in sequence: a first lens having positive optical focal power; a second lens having optical focal power; a third lens having a meniscus shape with a concave surface facing the image side and having negative optical focal power; a fourth lens having a meniscus shape with a convex surface facing the object side and having optical focal power; and a fifth lens having optical focal power; the relationship between the focal length of the third lens and the focal length of the entire camera lens system satisfies 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, in order from the object side to the image side: a first lens having a biconvex shape with a convex surface in the paraxial zone facing the object side and having a positive optical focal length; a second lens having a convex surface in the paraxial zone facing the object side and having a negative optical focal length; a third lens having a concave surface in the paraxial zone facing the image side and having a positive optical focal length; a fourth lens having a positive optical focal length in the paraxial zone; and a fifth lens having a concave surface in the paraxial zone facing the object side and having a negative optical focal length.

[0012] The first lens has a high power, which makes it possible to achieve a low profile. In addition, the lens has a biconvex shape with a convex surface facing the object side in the paraxial region, which suppresses spherical aberration, coma, astigmatism, and distortion.

[0013] The second lens can correct chromatic aberration, spherical aberration, coma, astigmatism and distortion well. In addition, by making the convex surface of the paraxial region face the object side, spherical aberration, coma and astigmatism can be corrected better.

[0014] The third lens element can correct coma, astigmatism, field curvature and distortion well. In addition, the concave surface of the paraxial region is directed toward the image side, which can better correct coma and distortion.

[0015] The fourth lens element achieves low profile and well corrects coma, astigmatism, and distortion.

[0016] The fifth lens element can correct chromatic aberration, astigmatism, field curvature and distortion well. In addition, by having a concave surface facing the object side in the paraxial region, it can better correct coma, astigmatism, field curvature and distortion.

[0017] In the imaging lens having the above configuration, it is preferred that the image-side surface of the second lens be concave toward the image side in the paraxial region.

[0018] By making the image-side surface of the second lens concave toward the image side in the paraxial region, coma and astigmatism can be corrected well.

[0019] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (1) is satisfied:

[0020] (1)9.00<νd5<36.00

[0021] in,

[0022] νd5: The dispersion coefficient of the fifth lens with respect to the d-line.

[0023] The conditional expression (1) defines the Abbe coefficient of the fifth lens with respect to the d-line within an appropriate range. When the conditional expression (1) is satisfied, chromatic aberration can be corrected well.

[0024] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (2) is satisfied:

[0025] (2) 9.00<νd4<36.00

[0026] in,

[0027] νd4: The dispersion coefficient of the fourth lens with respect to the d-line.

[0028] Conditional expression (2) defines the Abbe coefficient of the fourth lens with respect to the d-line within an appropriate range. When the range of conditional expression (2) is satisfied, chromatic aberration can be corrected well.

[0029] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (3) is satisfied:

[0030] (3)-3.00<r2 / f<-0.50

[0031] in,

[0032] r2: paraxial radius of curvature of the image side of the first lens,

[0033] f: Focal length of the entire camera lens system.

[0034] Conditional expression (3) specifies the paraxial curvature radius of the image side surface of the first lens within an appropriate range. By satisfying the range of conditional expression (3), spherical aberration, coma, astigmatism, and distortion can be corrected well.

[0035] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (4) is satisfied:

[0036] (4)r10 / r3<-6.50

[0037] in,

[0038] r10: paraxial curvature radius of the image side of the fifth lens,

[0039] r3: paraxial radius of curvature of the object side of the second lens.

[0040] Conditional formula (4) specifies the relationship between the paraxial curvature radius of the image side surface of the fifth lens and the paraxial curvature radius of the object side surface of the second lens within an appropriate range. By satisfying the range of conditional formula (4), spherical aberration, coma, astigmatism, field curvature and distortion can be well corrected.

[0041] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (5) is satisfied:

[0042] (5) 0.10<r5 / f<0.35

[0043] in,

[0044] r5: the paraxial radius of curvature of the object side of the third lens,

[0045] f: Focal length of the entire camera lens system.

[0046] Conditional expression (5) specifies the paraxial curvature radius of the object-side surface of the third lens within an appropriate range. By satisfying the range of conditional expression (5), coma, astigmatism, field curvature, and distortion can be corrected well.

[0047] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (6) is satisfied:

[0048] (6)r10 / f<-2.50

[0049] in,

[0050] r10: paraxial curvature radius of the image side of the fifth lens,

[0051] f: Focal length of the entire camera lens system.

[0052] Conditional expression (6) specifies the paraxial curvature radius of the image-side surface of the fifth lens within an appropriate range. By satisfying the range of conditional expression (6), coma, astigmatism, field curvature, and distortion can be corrected well.

[0053] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (7) is satisfied:

[0054] (7)35.00<νd3<84.00

[0055] in,

[0056] νd3: The dispersion coefficient of the third lens with respect to the d-line.

[0057] Conditional expression (7) defines the Abbe coefficient of the third lens with respect to the d-line within an appropriate range. When the range of conditional expression (7) is satisfied, chromatic aberration can be corrected well.

[0058] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (8) is satisfied:

[0059] (8) 0.20<r3 / f<1.50

[0060] in,

[0061] r3: the paraxial radius of curvature of the object side of the second lens,

[0062] f: Focal length of the entire camera lens system.

[0063] Conditional expression (8) specifies the paraxial curvature radius of the object-side surface of the second lens within an appropriate range. By satisfying the range of conditional expression (8), spherical aberration, coma, and astigmatism can be corrected well.

[0064] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (9) is satisfied:

[0065] (9) 0.05<r4 / f<0.30

[0066] in,

[0067] r4: paraxial curvature radius of the image side of the second lens,

[0068] f: Focal length of the entire camera lens system.

[0069] Conditional expression (9) specifies the paraxial curvature radius of the image-side surface of the second lens within an appropriate range. By satisfying the range of conditional expression (9), coma aberration and astigmatism can be corrected well.

[0070] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (10) is satisfied:

[0071] (10) 0.10<r6 / f<0.90

[0072] in,

[0073] r6: paraxial curvature radius of the image side of the third lens,

[0074] f: Focal length of the entire camera lens system.

[0075] Conditional expression (10) specifies the paraxial curvature radius of the image side surface of the third lens within an appropriate range. By satisfying the range of conditional expression (10), coma aberration and distortion can be corrected well.

[0076] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (11) is satisfied:

[0077] (11)-1.05<r9 / f<-0.15

[0078] in,

[0079] r9: the paraxial radius of curvature of the object side of the fifth lens,

[0080] f: Focal length of the entire camera lens system.

[0081] Conditional expression (11) specifies the paraxial curvature radius of the object-side surface of the fifth lens within an appropriate range. By satisfying the range of conditional expression (11), coma, astigmatism, and distortion can be corrected well.

[0082] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (12) is satisfied:

[0083] (12)-4.00<r2 / r3<-0.50

[0084] in,

[0085] r2: paraxial radius of curvature of the image side of the first lens,

[0086] r3: paraxial radius of curvature of the object side of the second lens.

[0087] Conditional expression (12) specifies the relationship between the paraxial curvature radius of the image side surface of the first lens and the paraxial curvature radius of the object side surface of the second lens within an appropriate range. By satisfying the range of conditional expression (12), spherical aberration, coma, astigmatism and distortion can be well corrected.

[0088] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (13) is satisfied:

[0089] (13)-1.35<r2 / r1 / f1<-0.10

[0090] in,

[0091] r2: paraxial radius of curvature of the image side of the first lens,

[0092] r1: paraxial radius of curvature of the object side of the first lens,

[0093] f1: focal length of the first lens.

[0094] Conditional formula (13) specifies the relationship between the paraxial curvature radius of the image side surface of the first lens, the paraxial curvature radius of the object side surface of the first lens, and the focal length of the first lens within an appropriate range. By satisfying the range of conditional formula (13), low-profile lens can be achieved, and spherical aberration, coma, astigmatism, and distortion can be well corrected.

[0095] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (14) is satisfied:

[0096] (14)-110.00<r2 / (T3-T2)<-4.00

[0097] in,

[0098] r2: paraxial radius of curvature of the image side of the first lens,

[0099] T3: The distance on the optical axis from the image side of the third lens to the object side of the fourth lens.

[0100] T2: The distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens.

[0101] Conditional formula (14) specifies the relationship between the paraxial curvature radius of the image side surface of the first lens, the distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens, and the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens within an appropriate range. By satisfying the range of conditional formula (14), the focal length of the image side surface of the first lens can be maintained, and the third lens is configured in an optimal position, so that the various aberration correction functions of the lens become more effective. As a result, low-profile can be achieved, and spherical aberration, coma, astigmatism and distortion can be corrected well.

[0102] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (15) is satisfied:

[0103] (15)1.00<r3 / r4<8.00

[0104] in,

[0105] r3: the paraxial radius of curvature of the object side of the second lens,

[0106] r4: paraxial radius of curvature of the image-side surface of the second lens.

[0107] Conditional expression (15) specifies the relationship between the paraxial curvature radius of the object side surface of the second lens and the paraxial curvature radius of the image side surface of the second lens within an appropriate range. By satisfying the range of conditional expression (15), spherical aberration, coma and astigmatism can be well corrected.

[0108] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (16) is satisfied:

[0109] (16) 0.35<r4 / r5<1.50

[0110] in,

[0111] r4: paraxial curvature radius of the image side of the second lens,

[0112] r5: paraxial radius of curvature of the object side of the third lens.

[0113] Conditional expression (16) specifies the relationship between the paraxial curvature radius of the image side surface of the second lens and the paraxial curvature radius of the object side surface of the third lens within an appropriate range. By satisfying the range of conditional expression (16), coma, astigmatism, field curvature and distortion can be well corrected.

[0114] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (17) is satisfied:

[0115] (17)-45.50<r8 / T4<-10.00

[0116] in,

[0117] r8: paraxial curvature radius of the image side of the fourth lens,

[0118] 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.

[0119] Conditional formula (17) specifies the relationship between the paraxial curvature radius of the image side surface of the fourth lens and the distance on the optical axis from the image side surface of the fourth lens to the object side surface of the fifth lens within an appropriate range. By satisfying the range of conditional formula (17), coma, astigmatism and distortion can be well corrected.

[0120] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (18) is satisfied:

[0121] (18) 0.00<r9 / r10<0.25

[0122] in,

[0123] r9: the paraxial radius of curvature of the object side of the fifth lens,

[0124] r10: paraxial curvature radius of the image-side surface of the fifth lens.

[0125] Conditional expression (18) specifies the relationship between the paraxial curvature radius of the object side surface of the fifth lens and the paraxial curvature radius of the image side surface of the fifth lens within an appropriate range. By satisfying the range of conditional expression (18), coma, astigmatism, field curvature and distortion can be well corrected.

[0126] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (19) is satisfied:

[0127] (19)r10 / r4<-10.00

[0128] in,

[0129] r10: paraxial radius of curvature of the image side of the fifth lens,

[0130] r4: paraxial radius of curvature of the image-side surface of the second lens.

[0131] Conditional expression (19) specifies the relationship between the paraxial curvature radius of the image side surface of the fifth lens and the paraxial curvature radius of the image side surface of the second lens within an appropriate range. By satisfying the range of conditional expression (19), coma, astigmatism, field curvature and distortion can be well corrected.

[0132] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (20) is satisfied:

[0133] (20)r10 / r5<-10.00

[0134] in,

[0135] r10: paraxial radius of curvature of the image side of the fifth lens,

[0136] r5: paraxial radius of curvature of the object side of the third lens.

[0137] The conditional expression (20) specifies the relationship between the paraxial curvature radius of the image side surface of the fifth lens and the paraxial curvature radius of the object side surface of the third lens within an appropriate range. By satisfying the range of the conditional expression (20), coma, astigmatism, field curvature and distortion can be well corrected.

[0138] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (21) is satisfied:

[0139] (21)3.00<(D4 / f4)×100<13.50

[0140] in,

[0141] D4: The thickness of the fourth lens on the optical axis,

[0142] f4: Focal length of the fourth lens.

[0143] Conditional expression (21) defines the relationship between the thickness of the fourth lens on the optical axis and the focal length of the fourth lens within an appropriate range. By satisfying the range of conditional expression (21), a low profile can be achieved, and coma, astigmatism, and distortion can be corrected well.

[0144] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (22) is satisfied:

[0145] (22) 0.30<f3 / f<2.50

[0146] in,

[0147] f3: focal length of the third lens,

[0148] f: Focal length of the entire camera lens system.

[0149] Conditional expression (22) specifies the focal length of the third lens within an appropriate range. By satisfying the range of conditional expression (22), coma, astigmatism, field curvature, and distortion can be corrected well.

[0150] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (23) is satisfied:

[0151] (23)-1.00<f2 / f4<-0.20

[0152] in,

[0153] f2: focal length of the second lens,

[0154] f4: Focal length of the fourth lens.

[0155] Conditional expression (23) specifies the relationship between the focal length of the second lens and the focal length of the fourth lens within an appropriate range. By satisfying the range of conditional expression (23), the focal power of the second lens and the focal power of the fourth lens can be appropriately balanced. As a result, chromatic aberration, spherical aberration, coma, astigmatism and distortion can be well corrected.

[0156] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (24) is satisfied:

[0157] (24) 0.35<f2 / f5<1.00

[0158] in,

[0159] f2: focal length of the second lens,

[0160] f5: Focal length of the fifth lens.

[0161] Conditional expression (24) specifies the relationship between the focal length of the second lens and the focal length of the fifth lens within an appropriate range. By satisfying the range of conditional expression (24), the focal power of the second lens and the focal power of the fifth lens can be appropriately balanced. As a result, chromatic aberration, spherical aberration, coma, astigmatism, field curvature and distortion can be well corrected.

[0162] Effects of the Invention

[0163] 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

[0164] Figure 1 It is a diagram showing a schematic structure of an imaging lens according to Example 1 of the present invention.

[0165] Figure 2 These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 1 of the present invention.

[0166] Figure 3 A diagram schematically showing the structure of an imaging lens according to Example 2 of the present invention.

[0167] Figure 4 These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 2 of the present invention.

[0168] Figure 5 A diagram schematically showing the structure of an imaging lens according to Example 3 of the present invention.

[0169] Figure 6These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 3 of the present invention. DETAILED DESCRIPTION

[0170] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0171] Figure 1 , Figure 3 and Figure 5 The following are schematic diagrams of the configurations of imaging lenses according to Examples 1 to 3 of the embodiments of the present invention.

[0172] The camera lens of this embodiment includes, from the object side to the image side, in order: a first lens L1, which is a biconvex shape with a convex surface in the paraxial zone facing the object side and has positive optical power; a second lens L2, which has a convex surface in the paraxial zone facing the object side and has negative optical power; a third lens L3, which has a concave surface in the paraxial zone facing the image side and has positive optical power; a fourth lens L4, which has a positive optical power in the paraxial zone; and a fifth lens L5, which has a concave surface in the paraxial zone facing the object side and has negative optical power.

[0173] An infrared cut filter, a protective glass or other filter IR is disposed between the fifth lens L5 and the imaging plane IMG (ie, the imaging plane of the imaging element). The filter IR may be omitted.

[0174] The aperture stop ST is disposed between the third lens L3 and the fourth lens L4, so as to facilitate the correction of distortion. In addition, the position of the aperture stop ST is not limited to between the third lens L3 and the fourth lens L4. The aperture stop ST can also be appropriately disposed according to the design of the imaging element.

[0175] The first lens L1 has positive refractive power and is biconvex in shape with a convex surface facing the object side and a convex surface facing the image side in the paraxial region. Therefore, low profile is achieved by having positive refractive power on both sides. In addition, spherical aberration, coma, astigmatism and distortion are suppressed by having a biconvex shape with a convex surface facing the object side in the paraxial region.

[0176] The second lens L2 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 region. Therefore, chromatic aberration, spherical aberration, coma, astigmatism and distortion are well corrected. In addition, spherical aberration, coma and astigmatism are well corrected by having a convex surface facing the object side in the paraxial region.

[0177] The third lens L3 has positive refractive 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. Therefore, coma, astigmatism, field curvature and distortion are well corrected. In addition, coma and distortion are well corrected by having a concave surface facing the image side in the paraxial region.

[0178] The fourth lens L4 has positive refractive power and is biconvex in shape with a convex surface facing the object side and a convex surface facing the image side in the paraxial region. Therefore, the positive refractive power of both surfaces can achieve low profile and well correct coma, astigmatism and distortion.

[0179] In addition, if Figure 3 and Figure 5 As shown in Examples 2 and 3, the fourth lens L4 may also be in 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, coma, astigmatism and distortion can be corrected well.

[0180] The fifth lens L5 has negative power and is in a meniscus shape with a concave surface facing the object side in the paraxial region and a convex surface facing the image side. Therefore, chromatic aberration, astigmatism, field curvature and distortion are well corrected. In addition, coma, astigmatism, field curvature and distortion are well corrected by having a concave surface facing the object side in the paraxial region.

[0181] In the camera lens of this embodiment, it is preferred that all lenses from the first lens L1 to the fifth lens L5 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.

[0182] 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.

[0183] 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.

[0184] The imaging lens in this embodiment satisfies the following conditional expressions (1) to (24), thereby achieving favorable effects.

[0185] (1)9.00<νd5<36.00

[0186] (2) 9.00<νd4<36.00

[0187] (3)-3.00<r2 / f<-0.50

[0188] (4)r10 / r3<-6.50

[0189] (5) 0.10<r5 / f<0.35

[0190] (6)r10 / f<-2.50

[0191] (7)35.00<νd3<84.00

[0192] (8) 0.20<r3 / f<1.50

[0193] (9) 0.05<r4 / f<0.30

[0194] (10) 0.10<r6 / f<0.90

[0195] (11)-1.05<r9 / f<-0.15

[0196] (12)-4.00<r2 / r3<-0.50

[0197] (13)-1.35<r2 / r1 / f1<-0.10

[0198] (14)-110.00<r2 / (T3-T2)<-4.00

[0199] (15)1.00<r3 / r4<8.00

[0200] (16) 0.35<r4 / r5<1.50

[0201] (17)-45.50<r8 / T4<-10.00

[0202] (18) 0.00<r9 / r10<0.25

[0203] (19)r10 / r4<-10.00

[0204] (20)r10 / r5<-10.00

[0205] (21)3.00<(D4 / f4)×100<13.50

[0206] (22) 0.30<f3 / f<2.50

[0207] (23)-1.00<f2 / f4<-0.20

[0208] (24) 0.35<f2 / f5<1.00

[0209] in,

[0210] νd3: the dispersion coefficient of the third lens L3 with respect to the d-line,

[0211] νd4: dispersion coefficient of the fourth lens L4 with respect to the d-line,

[0212] νd5: dispersion coefficient of the fifth lens L5 with respect to the d-line,

[0213] D4: thickness of the fourth lens L4 on the optical axis X,

[0214] T2: the distance on the optical axis X from the image side surface of the second lens L2 to the object side surface of the third lens L3,

[0215] T3: the distance on the optical axis X from the image side surface of the third lens L3 to the object side surface of the fourth lens L4,

[0216] 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,

[0217] f: focal length of the entire camera lens system,

[0218] f1: focal length of the first lens L1,

[0219] f2: focal length of the second lens L2,

[0220] f3: focal length of the third lens L3,

[0221] f4: focal length of the fourth lens L4,

[0222] f5: focal length of the fifth lens L5,

[0223] r1: paraxial radius of curvature of the object side of the first lens L1,

[0224] r2: paraxial curvature radius of the image side surface of the first lens L1,

[0225] r3: the paraxial radius of curvature of the object side of the second lens L2,

[0226] r4: paraxial curvature radius of the image side surface of the second lens L2,

[0227] r5: paraxial radius of curvature of the object side of the third lens L3,

[0228] r6: paraxial radius of curvature of the image side surface of the third lens L3,

[0229] r8: paraxial curvature radius of the image side surface of the fourth lens L4,

[0230] r9: paraxial radius of curvature of the object side of the fifth lens L5,

[0231] r10: paraxial curvature radius of the image-side surface of the fifth lens L5.

[0232] It is not necessary to satisfy all of the above-mentioned conditional expressions, and by satisfying each conditional expression individually, an action and effect corresponding to each conditional expression can be obtained.

[0233] Furthermore, the imaging lens in this embodiment satisfies the following conditional expressions (1a) to (24a), thereby achieving better effects.

[0234] (1a)17.00<νd5<31.00

[0235] (2a)15.00<νd4<31.00

[0236] (3a)-2.45<r2 / f<-0.80

[0237] (4a)-1100.00<r10 / r3<-8.50

[0238] (5a) 0.15<r5 / f<0.30

[0239] (6a)-1100.00<r10 / f<-3.50

[0240] (7a)45.00<νd3<69.00

[0241] (8a) 0.30<r3 / f<1.25

[0242] (9a) 0.15<r4 / f<0.25

[0243] (10a) 0.20<r6 / f<0.75

[0244] (11a)-0.90<r9 / f<-0.25

[0245] (12a)-3.20<r2 / r3<-1.25

[0246] (13a)-1.05<r2 / r1 / f1<-0.15

[0247] (14a)-90.00<r2 / (T3-T2)<-7.00

[0248] (15a)1.50<r3 / r4<6.50

[0249] (16a) 0.55<r4 / r5<1.25

[0250] (17a)-38.00<r8 / T4<-14.50

[0251] (18a) 0.00<r9 / r10<0.20

[0252] (19a)-5600.00<r10 / r4<-16.00

[0253] (20a)-4000.00<r10 / r5<-16.00

[0254] (21a)5.00<(D4 / f4)×100<11.00

[0255] (22a) 0.60<f3 / f<2.00

[0256] (23a)-0.80<f2 / f4<-0.35

[0257] (24a)0.45<f2 / f5<0.85

[0258] The symbols of each conditional expression are the same as those described in the previous paragraph.

[0259] 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.

[0260] [Mathematical formula 1]

[0261]

[0262] 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 angle, 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.

[0263] [Example 1]

[0264] Basic lens data are shown in Table 1 below.

[0265] [Table 1]

[0266]

[0267] The imaging lens of Example 1 satisfies conditional expressions (1) to (24) as shown in Table 4.

[0268] Figure 2The 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 and Figure 6 are the same in the examples. Figure 2 As shown, it can be seen that each aberration is well corrected.

[0269] [Example 2]

[0270] Basic lens data are shown in Table 2 below.

[0271] [Table 2]

[0272]

[0273] The imaging lens of Example 2 satisfies conditional expressions (1) to (24) as shown in Table 4.

[0274] 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.

[0275] [Example 3]

[0276] Basic lens data are shown in Table 3 below.

[0277] [Table 3]

[0278]

[0279] The imaging lens of Example 3 satisfies conditional expressions (1) to (24) as shown in Table 4.

[0280] 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.

[0281] Table 4 shows the values ​​of conditional expressions (1) to (24) according to Examples 1 to 3.

[0282] [Table 4]

[0283]

[0284] Industrial Applicability

[0285] 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.

[0286] Description of Reference Numerals

[0287] ST Aperture Stop,

[0288] L1 first lens,

[0289] L2 Second lens,

[0290] L3 third lens,

[0291] L4 fourth lens,

[0292] L5 fifth lens,

[0293] IR filter,

[0294] IMG camera surface.

Claims

1. A camera lens, characterized in that: From the object side to the image side, they include: The first lens is biconvex in shape with a convex surface facing the object side in the paraxial region and has positive optical power; The second lens has a convex surface facing the object side in the paraxial region and has negative optical power; The third lens has a concave surface facing the image side in the paraxial region and has positive optical power; a fourth lens having positive refractive power in a paraxial zone; and The fifth lens element has a concave surface facing the object side in the paraxial region and has negative optical power; and satisfies the following conditional equations (1), (6) and (9): (1)9.00<νd5<36.00 (6)r10 / f＜-2.50 (9)0.05＜r4 / f＜0.30 in, νd5: dispersion coefficient of the fifth lens relative to the d-line, r4: paraxial curvature radius of the image side of the second lens, r10: paraxial radius of curvature of the image side of the fifth lens, f: Focal length of the entire camera lens system.

2. The imaging lens according to claim 1, wherein: Satisfies the following conditional formula (2), (2) 9.00<νd4<36.00 in, νd4: The dispersion coefficient of the fourth lens with respect to the d-line.

3. The imaging lens according to claim 1, wherein: Satisfies the following conditional formula (3), (3)-3.00＜r2 / f＜-0.50 in, r2: paraxial radius of curvature of the image side of the first lens, f: Focal length of the entire camera lens system.

4. The imaging lens according to claim 1, wherein: Satisfies the following conditional formula (4), (4)r10 / r3＜-6.50 in, r10: paraxial radius of curvature of the image side of the fifth lens, r3: paraxial radius of curvature of the object side of the second lens.

5. The imaging lens according to claim 1, wherein: Satisfies the following conditional formula (5), (5)0.10＜r5 / f＜0.35 in, r5: the paraxial radius of curvature of the object side of the third lens, f: Focal length of the entire camera lens system.

Images