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 having positive optical power; a second lens having negative optical power; a third lens having positive or negative optical power; a fourth lens having negative optical power; a fifth lens having positive optical power; and a sixth lens having negative optical power; the first lens is in a meniscus shape with a convex surface facing the object side in the paraxial zone, the second lens has a convex surface facing the object side in the paraxial zone, and the sixth lens has a concave 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 (China Patent Gazette No. 107966793) discloses a camera lens, which includes, from the object side, in sequence: a first lens; a second lens having positive optical focal power; a third lens having negative optical focal power; a fourth lens; a fifth lens; and a sixth lens; the relationship between the focal length of the first lens and the focal length of the entire camera lens system and the relationship between the dispersion coefficient of the second lens and the thickness of the second lens on the optical axis and the total optical length 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 a first lens having positive optical power, a second lens having negative optical power, a third lens having positive or negative optical power, a fourth lens having negative optical power, a fifth lens having positive optical power, and a sixth lens having negative optical power; the first lens is in a meniscus shape with a convex surface facing the object side in the paraxial zone, the second lens has a convex surface facing the object side in the paraxial zone, and the sixth lens has a concave surface facing the image side in the paraxial zone.

[0012] The first lens element is in a meniscus shape with a convex surface facing the object side in the paraxial region, thereby suppressing spherical aberration, coma, astigmatism, field curvature and distortion.

[0013] The second lens has negative power, which can effectively correct chromatic aberration. In addition, the convex surface in the paraxial region faces the object side, which can effectively correct astigmatism, field curvature and distortion.

[0014] The third lens has positive or negative optical power. When the third lens has positive optical power,

[0015] Spherical aberration, astigmatism, field curvature and distortion are well corrected. When the third lens has a negative optical power, chromatic aberration, astigmatism, field curvature and distortion are well corrected. In addition, by using an aspherical surface for the third lens, astigmatism, field curvature and distortion are better corrected.

[0016] Since the fourth lens has negative power, chromatic aberration, coma, astigmatism, field curvature and distortion are well corrected.

[0017] Since the fifth lens has positive refractive power, low profile is achieved and coma, astigmatism, field curvature and distortion are well corrected.

[0018] The sixth lens has negative refractive power and uses an aspherical surface to correct chromatic aberration, astigmatism, field curvature and distortion well. In addition, the concave surface in the paraxial region faces the image side to maintain a low profile and ensure a secure back focus.

[0019] In addition, in the imaging lens of the above structure, it is preferred that the object-side surface of the sixth lens be concave toward the object side in the paraxial region.

[0020] By making the object side surface of the sixth lens element concave toward the object side in the paraxial region, the incident angle of light to the sixth lens element can be appropriately controlled. As a result, astigmatism, field curvature and distortion can be well corrected.

[0021] 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.

[0022] 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.

[0023] By adopting the above structure, the imaging lens of the present invention can achieve a low profile with an overall aspect ratio (the ratio of the overall optical length to the diagonal length of the effective imaging surface of the imaging element) of 0.7 or less, and a low F value of 2.0 or less.

[0024] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (1) is satisfied:

[0025] (1)f4 / f<-13.00

[0026] in,

[0027] f4: focal length of the fourth lens,

[0028] f: Focal length of the entire camera lens system.

[0029] Conditional expression (1) specifies the focal length of the fourth lens within an appropriate range. When the range of conditional expression (1) is satisfied, chromatic aberration, coma, astigmatism, field curvature, and distortion can be corrected well.

[0030] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (2) is satisfied:

[0031] (2)0.10<(r6 / |f3|)×100<55.00

[0032] in,

[0033] r6: paraxial curvature radius of the image side of the third lens,

[0034] f3: focal length of the third lens.

[0035] Conditional expression (2) defines the relationship between the paraxial curvature radius of the image-side surface of the third lens and the focal length of the third lens within an appropriate range. By satisfying conditional expression (2), astigmatism, field curvature, and distortion can be corrected well.

[0036] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (3) is satisfied:

[0037] (3)7.50<r7 / T3<20.00

[0038] in,

[0039] r7: the paraxial radius of curvature of the object side of the fourth lens,

[0040] T3: The distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens.

[0041] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (4) is satisfied:

[0042] (4)33.00<νd3<79.00

[0043] in,

[0044] νd3: The dispersion coefficient of the third lens with respect to the d-line.

[0045] Conditional expression (4) defines the Abbe coefficient of the third lens with respect to the d-line within an appropriate range. When the range of conditional expression (4) is satisfied, chromatic aberration can be corrected well.

[0046] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (5) is satisfied:

[0047] (5) 0.50<r2 / f1<1.50

[0048] in,

[0049] r2: paraxial radius of curvature of the image side of the first lens,

[0050] f1: focal length of the first lens.

[0051] Conditional expression (5) specifies the relationship between the paraxial curvature radius of the image side surface of the first lens and the focal length of the first lens within an appropriate range. By satisfying conditional expression (5), low-profile lens can be achieved, and spherical aberration, coma, astigmatism, field curvature and distortion can be well corrected.

[0052] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (6) is satisfied:

[0053] (6) 0.20<r3 / r4<2.00

[0054] in,

[0055] r3: the paraxial radius of curvature of the object side of the second lens,

[0056] r4: paraxial radius of curvature of the image-side surface of the second lens.

[0057] Conditional expression (6) 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 (6), coma, astigmatism, field curvature and distortion can be well corrected.

[0058] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (7) is satisfied:

[0059] (7)|r9| / r10<-8.40

[0060] in,

[0061] r9: the paraxial radius of curvature of the object side of the fifth lens,

[0062] r10: paraxial curvature radius of the image-side surface of the fifth lens.

[0063] The conditional expression (7) 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 the conditional expression (7), coma, astigmatism, field curvature and distortion can be corrected well.

[0064] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (8) is satisfied:

[0065] (8) 0.20<r8 / f<1.20

[0066] in,

[0067] r8: paraxial curvature radius of the image side of the fourth lens,

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

[0069] Conditional expression (8) specifies the paraxial curvature radius of the image-side surface of the fourth lens within an appropriate range. By satisfying the range of conditional expression (8), astigmatism, field curvature, and distortion can be corrected well.

[0070] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (9) is satisfied:

[0071] (9)8.50<|f3| / f

[0072] in,

[0073] f3: focal length of the third lens,

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

[0075] Conditional expression (9) specifies the focal length of the third lens within an appropriate range. By satisfying the range of conditional expression (9), astigmatism, field curvature, 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 (10) is satisfied:

[0077] (10)-10.00<|f3| / f4<-0.30

[0078] in,

[0079] f3: focal length of the third lens,

[0080] f4: Focal length of the fourth lens.

[0081] Conditional expression (10) defines the relationship between the focal length of the third lens and the focal length of the fourth lens within an appropriate range. By satisfying the range of conditional expression (10), chromatic aberration, coma, astigmatism, field curvature, 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 (11) is satisfied:

[0083] (11) 0.10<r2 / r6<0.45

[0084] in,

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

[0086] r6: paraxial radius of curvature of the image-side surface of the third lens.

[0087] The conditional expression (11) specifies the relationship between the paraxial curvature radius of the image side surface of the first lens and the paraxial curvature radius of the image side surface of the third lens within an appropriate range. By satisfying the range of the conditional expression (11), astigmatism, field curvature and distortion can be corrected well.

[0088] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (12) is satisfied:

[0089] (12) -0.70<r3 / f2<-0.25

[0090] in,

[0091] r3: the paraxial radius of curvature of the object side of the second lens,

[0092] f2: Focal length of the second lens.

[0093] Conditional expression (12) defines the relationship between the paraxial curvature radius of the object-side surface of the second lens and the focal length of the second lens within an appropriate range. By satisfying conditional expression (12), chromatic aberration, 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 (13) is satisfied:

[0095] (13)2.20<r5 / f<4.50

[0096] in,

[0097] r5: the paraxial radius of curvature of the object side of the third lens,

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

[0099] Conditional expression (13) 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 (13), 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 (14) is satisfied:

[0101] (14)2.50<r6 / r7<5.50

[0102] in,

[0103] r6: paraxial curvature radius of the image side of the third lens,

[0104] r7: paraxial radius of curvature of the object side of the fourth lens.

[0105] Conditional expression (14) specifies the relationship between the paraxial curvature radius of the image side surface of the third lens and the paraxial curvature radius of the object side surface of the fourth lens within an appropriate range. By satisfying the range of conditional expression (14), coma, astigmatism, field curvature and distortion can be well corrected.

[0106] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (15) is satisfied:

[0107] (15)-3.40<r6 / r11<-0.50

[0108] in,

[0109] r6: paraxial curvature radius of the image side of the third lens,

[0110] r11: paraxial radius of curvature of the object side surface of the sixth lens.

[0111] Conditional expression (15) specifies the relationship between the paraxial curvature radius of the image side surface of the third lens and the paraxial curvature radius of the object side surface of the sixth lens within an appropriate range. By satisfying the range of conditional expression (15), astigmatism, field curvature and distortion can be corrected well.

[0112] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (16) is satisfied:

[0113] (16)6.75<r6 / r12<22.00

[0114] in,

[0115] r6: paraxial curvature radius of the image side of the third lens,

[0116] r12: paraxial radius of curvature of the image-side surface of the sixth lens.

[0117] Conditional expression (16) specifies the relationship between the paraxial curvature radius of the image side surface of the third lens and the paraxial curvature radius of the image side surface of the sixth lens within an appropriate range. By satisfying the range of conditional expression (16), astigmatism, field curvature and distortion can be corrected well.

[0118] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (17) is satisfied:

[0119] (17)22.00<r6 / T3<90.00

[0120] in,

[0121] r6: paraxial curvature radius of the image side of the third lens,

[0122] T3: The distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens.

[0123] Conditional formula (17) specifies the relationship between the paraxial curvature radius of the image side surface of the third lens and the distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens within an appropriate range. By satisfying the range of conditional formula (17), low profile can be achieved, and astigmatism, field curvature and distortion can be well corrected.

[0124] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (18) is satisfied:

[0125] (18)15.00<r6 / (T2+D3)<45.00

[0126] in,

[0127] r6: paraxial curvature radius of the image side of the third lens,

[0128] T2: The distance on the optical axis from the image side of the second lens to the object side of the third lens.

[0129] D3: The thickness of the third lens on the optical axis.

[0130] Conditional formula (18) specifies the relationship between the paraxial curvature radius of the image side surface of the third lens, the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, and the thickness on the optical axis of the third lens within an appropriate range. By satisfying the range of conditional formula (18), low profile can be achieved, and astigmatism, field curvature, and distortion can be well corrected.

[0131] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (19) is satisfied:

[0132] (19)7.00<r8 / T3<18.50

[0133] in,

[0134] r8: paraxial curvature radius of the image side of the fourth lens,

[0135] T3: The distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens.

[0136] Conditional formula (19) 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 third lens to the object side surface of the fourth lens within an appropriate range. By satisfying the range of conditional formula (19), low profile can be achieved, and astigmatism, field curvature and distortion can be well corrected.

[0137] In addition, in the imaging lens of the above structure, it is preferable that the following conditional expression (20) is satisfied:

[0138] (20)-1.10<r8 / r11<-0.20

[0139] in,

[0140] r8: paraxial curvature radius of the image side of the fourth lens,

[0141] r11: paraxial radius of curvature of the object side surface of the sixth lens.

[0142] The conditional expression (20) specifies the relationship between the paraxial curvature radius of the image side surface of the fourth lens and the paraxial curvature radius of the object side surface of the sixth lens within an appropriate range. By satisfying the range of the conditional expression (20), 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 (21) is satisfied:

[0144] (21)2.65<|r9| / f<35.00

[0145] in,

[0146] r9: the paraxial radius of curvature of the object side of the fifth lens,

[0147] f: Focal length of the entire camera lens system.

[0148] The conditional expression (21) specifies the paraxial curvature radius of the object-side surface of the fifth lens within an appropriate range. By satisfying the range of the conditional expression (21), 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 (22) is satisfied:

[0150] (22)-9.50<r11 / r12<-3.00

[0151] in,

[0152] r11: the paraxial curvature radius of the object side of the sixth lens,

[0153] r12: paraxial radius of curvature of the image-side surface of the sixth lens.

[0154] The conditional expression (22) specifies the relationship between the paraxial curvature radius of the object side surface of the sixth lens and the paraxial curvature radius of the image side surface of the sixth lens within an appropriate range. By satisfying the range of the conditional expression (22), 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 (23) is satisfied:

[0156] (23)1.90<r11 / f6<6.00

[0157] in,

[0158] r11: the paraxial curvature radius of the object side of the sixth lens,

[0159] f6: focal length of the sixth lens.

[0160] Conditional expression (23) defines the relationship between the paraxial curvature radius of the object-side surface of the sixth lens and the focal length of the sixth lens within an appropriate range. By satisfying conditional expression (23), chromatic aberration, 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 (24) is satisfied:

[0162] (24)-21.00<r11 / (T4+T5)<-7.00

[0163] in,

[0164] r11: the paraxial curvature radius of the object side of the sixth lens,

[0165] T4: The distance on the optical axis from the image side of the fourth lens to the object side of the fifth lens,

[0166] T5: The distance on the optical axis from the image side surface of the fifth lens to the object side surface of the sixth lens.

[0167] Conditional formula (24) specifies the relationship between the paraxial curvature radius of the object side surface of the sixth lens, the distance on the optical axis from the image side surface of the fourth lens to the object side surface of the fifth lens, and the distance on the optical axis from the image side surface of the fifth lens to the object side surface of the sixth lens within an appropriate range. By satisfying the range of conditional formula (24), low profile can be achieved, and astigmatism, field curvature, and distortion can be well corrected.

[0168] Effects of the Invention

[0169] 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

[0170] Figure 1 It is a diagram showing a schematic structure of an imaging lens according to Example 1 of the present invention.

[0171] Figure 2 These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 1 of the present invention.

[0172] Figure 3 A diagram schematically showing the structure of an imaging lens according to Example 2 of the present invention.

[0173] Figure 4 These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 2 of the present invention.

[0174] Figure 5 A diagram schematically showing the structure of an imaging lens according to Example 3 of the present invention.

[0175] Figure 6 These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 3 of the present invention.

[0176] Figure 7 A diagram schematically showing the structure of an imaging lens according to Example 4 of the present invention.

[0177] Figure 8 These are diagrams showing spherical aberration, astigmatism, and distortion of the imaging lens according to Example 4 of the present invention.

[0178] Fig. 9 A diagram schematically showing the structure of an imaging lens according to Example 5 of the present invention.

[0179] 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

[0180] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0181] 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 respectively.

[0182] The camera lens of this embodiment includes, from the object side to the image side, in order: a first lens L1 having positive optical power; a second lens L2 having negative optical power; a third lens L3 having positive or negative optical power; a fourth lens L4 having negative optical power; a fifth lens L5 having positive optical power; and a sixth lens L6 having negative optical power; the first lens L1 is in a meniscus shape with a convex surface facing the object side in the paraxial zone, the second lens L2 has a convex surface facing the object side in the paraxial zone, and the sixth lens L6 has a concave surface facing the image side in the paraxial zone.

[0183] An infrared cut filter, a protective glass or other filter IR is disposed between the sixth lens L6 and the imaging plane IMG (ie, the imaging plane of the imaging element). The filter IR may be omitted.

[0184] By arranging the aperture stop ST on the object side of the first lens L1, various aberrations can be easily corrected, and the incident angle of light with a high image height onto the imaging element can be easily controlled.

[0185] The first lens L1 has positive refractive power and has a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in a paraxial region, thereby suppressing spherical aberration, coma, astigmatism, field curvature and distortion.

[0186] The second lens L2 has negative refractive power and has a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in a paraxial region, so chromatic aberration, astigmatism, field curvature and distortion are well corrected.

[0187] The third lens L3 has positive refractive power and has a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in a paraxial region, so spherical aberration, astigmatism, field curvature and distortion are well corrected.

[0188] In addition, if Figure 3 In the second embodiment shown, the refractive power of the third lens L3 may be set to a negative value, which is advantageous for correcting chromatic aberration.

[0189] The fourth lens L4 has negative refractive power and has a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in a paraxial region, so chromatic aberration, coma, astigmatism, field curvature and distortion are well corrected.

[0190] The fifth lens L5 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 region. Therefore, the incident angle of light to the fifth lens L5 can be properly controlled, and coma, astigmatism, field curvature and distortion can be well corrected.

[0191] In addition, if Fig. 9As shown in Example 5, the shape of the fifth lens L5 can 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, low-profile is achieved through the positive optical power of both sides, which is beneficial to the correction of astigmatism and distortion.

[0192] The sixth lens L6 has negative optical power and is biconcave in a paraxial region with the concave surface facing the object side and the concave surface facing the image side. Therefore, chromatic aberration, astigmatism, field curvature and distortion are well corrected. In addition, the sixth lens L6 has a concave surface facing the image side in the paraxial region, so that the low profile is maintained and the back focus is ensured.

[0193] In addition, the image-side surface of the sixth lens L6 is formed as an aspherical surface having a pole at a position other than on the optical axis X. Therefore, astigmatism, field curvature, and distortion are corrected more effectively.

[0194] In the camera lens of this embodiment, it is preferred that all lenses from the first lens L1 to the sixth lens L6 are composed of respective single lenses. Only a single lens can make more use of aspheric surfaces. In this embodiment, by forming all lens surfaces into appropriate aspheric surfaces, various aberrations are well corrected. 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.

[0195] 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.

[0196] 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.

[0197] The imaging lens in this embodiment satisfies the following conditional expressions (1) to (24), thereby achieving favorable effects.

[0198] (1)f4 / f<-13.00

[0199] (2)0.10<(r6 / |f3|)×100<55.00

[0200] (3)7.50<r7 / T3<20.00

[0201] (4)33.00<νd3<79.00

[0202] (5) 0.50<r2 / f1<1.50

[0203] (6) 0.02<r3 / r4<2.00

[0204] (7)|r9| / r10<-8.40

[0205] (8) 0.20<r8 / f<1.20

[0206] (9)8.50<|f3| / f

[0207] (10)-10.00<|f3| / f4<-0.30

[0208] (11) 0.10<r2 / r6<0.45

[0209] (12) -0.70<r3 / f2<-0.25

[0210] (13)2.20<r5 / f<4.50

[0211] (14)2.50<r6 / r7<5.50

[0212] (15)-3.40<r6 / r11<-0.50

[0213] (16)6.75<r6 / r12<22.00

[0214] (17)22.00<r6 / T3<90.00

[0215] (18)15.00<r6 / (T2+D3)<45.00

[0216] (19)7.00<r8 / T3<18.50

[0217] (20)-1.10<r8 / r11<-0.20

[0218] (21)2.65<|r9| / f<35.00

[0219] (22)-9.50<r11 / r12<-3.00

[0220] (23)1.90<r11 / f6<6.00

[0221] (24)-21.00<r11 / (T4+T5)<-7.00

[0222] in,

[0223] νd3 dispersion coefficient of the third lens L3 with respect to the d-line,

[0224] D3: thickness of the third lens L3 on the optical axis X,

[0225] 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,

[0226] 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,

[0227] 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,

[0228] T5: the distance on the optical axis X from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6,

[0229] f: focal length of the entire camera lens system,

[0230] f1: focal length of the first lens L1,

[0231] f2: focal length of the second lens L2,

[0232] f3: focal length of the third lens L3,

[0233] f4: focal length of the fourth lens L4,

[0234] f6: focal length of the sixth lens L6,

[0235] r2: paraxial curvature radius of the image side surface of the first lens L1,

[0236] r3: the paraxial radius of curvature of the object side of the second lens L2,

[0237] r4: paraxial curvature radius of the image side surface of the second lens L2,

[0238] r5: paraxial radius of curvature of the object side of the third lens L3,

[0239] r6: paraxial radius of curvature of the image side surface of the third lens L3,

[0240] r7: paraxial radius of curvature of the object side of the fourth lens L4,

[0241] r8: paraxial curvature radius of the image side surface of the fourth lens L4,

[0242] r9: paraxial radius of curvature of the object side of the fifth lens L5,

[0243] r10: paraxial curvature radius of the image side surface of the fifth lens L5,

[0244] r11: paraxial radius of curvature of the object side surface of the sixth lens L6,

[0245] r12: paraxial curvature radius of the image-side surface of the sixth lens L6.

[0246] 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.

[0247] Furthermore, the imaging lens in this embodiment satisfies the following conditional expressions (1a) to (24a), thereby achieving better effects.

[0248] (1a)-300.00<f4 / f<-15.00

[0249] (2a)0.25<(r6 / |f3|)×100<45.00

[0250] (3a)9.00<r7 / T3<18.00

[0251] (4a)44.00<νd3<67.00

[0252] (5a) 0.75<r2 / f1<1.35

[0253] (6a) 0.80<r3 / r4<1.85

[0254] (7a)-100.00<|r9| / r10<-10.00

[0255] (8a) 0.45<r8 / f<1.00

[0256] (9a)11.00<|f3| / f<1500.00

[0257] (10a)-8.50<|f3| / f4<-0.55

[0258] (11a) 0.15<r2 / r6<0.40

[0259] (12a)-0.55<r3 / f2<-0.30

[0260] (13a)2.50<r5 / f<3.90

[0261] (14a)3.00<r6 / r7<4.90

[0262] (15a)-3.00<r6 / r11<-1.10

[0263] (16a)8.00<r6 / r12<18.00

[0264] (17a)33.50<r6 / T3<72.00

[0265] (18a)18.00<r6 / (T2+D3)<36.00

[0266] (19a)8.50<r8 / T3<16.00

[0267] (20a)-0.90<r8 / r11<-0.30

[0268] (21a)3.20<|r9| / f<25.00

[0269] (22a)-7.70<r11 / r12<-3.50

[0270] (23a)2.30<r11 / f6<4.90

[0271] (24a)-17.00<r11 / (T4+T5)<-8.00

[0272] The symbols of each conditional expression are the same as those described in the previous paragraph.

[0273] 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.

[0274] [Mathematical formula 1]

[0275]

[0276] 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.

[0277] [Example 1]

[0278] Basic lens data are shown in Table 1 below.

[0279] [Table 1]

[0280] Example 1

[0281] Unit: mm

[0282] f=5.53

[0283] Fno=1.90

[0284] ω( ° )=42.7

[0285] ih=5.16

[0286] TTL=6.43

[0287] Area data

[0288] Composition lens data

[0289]

[0290] Aspheric surface data

[0291]

[0292] The imaging lens of Example 1 achieves an overall aspect ratio of 0.62 and an F value of 1.90. In addition, as shown in Table 6, conditional expressions (1) to (24) are satisfied.

[0293] 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.

[0294] [Example 2]

[0295] Basic lens data are shown in Table 2 below.

[0296] [Table 2]

[0297] Example 2

[0298] Unit: mm

[0299] f=5.55

[0300] Fno=1.90

[0301] ω( ° )=42.5

[0302] ih=5.16

[0303] TTL=6.43

[0304] Area data

[0305] Composition lens data

[0306]

[0307] Aspheric surface data

[0308]

[0309] The imaging lens of Example 2 achieves an overall aspect ratio of 0.62 and an F value of 1.90. In addition, as shown in Table 6, conditional expressions (1) to (24) are satisfied.

[0310] 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.

[0311] [Example 3]

[0312] Basic lens data are shown in Table 3 below.

[0313] [Table 3]

[0314] Example 3

[0315] Unit: mm

[0316] f=5.55

[0317] Fno=1.90

[0318] ω( ° )=42.4

[0319] ih=5.16

[0320] TTL=6.43

[0321] Area data

[0322] Composition lens data

[0323]

[0324] Aspheric surface data

[0325]

[0326] The imaging lens of Example 3 achieves an overall aspect ratio of 0.62 and an F value of 1.90. In addition, as shown in Table 6, conditional expressions (1) to (24) are satisfied.

[0327] Figure 6For 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.

[0328] [Example 4]

[0329] Basic lens data are shown in Table 4 below.

[0330] [Table 4]

[0331] Example 4

[0332] Unit: mm

[0333] f=5.53

[0334] Fno=1.90

[0335] ω( ° )=42.5

[0336] ih=5.16

[0337] TTL=6.43

[0338] Area data

[0339] Composition lens data

[0340]

[0341] Aspheric surface data

[0342]

[0343] The imaging lens of Example 4 achieves an overall aspect ratio of 0.62 and an F value of 1.90. In addition, as shown in Table 6, conditional expressions (1) to (24) are satisfied.

[0344] 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.

[0345] [Example 5]

[0346] Basic lens data are shown in Table 5 below.

[0347] [Table 5]

[0348] Example 5

[0349] Unit: mm

[0350] f=5.54

[0351] Fno=1.90

[0352] ω( ° )=42.5

[0353] ih=5.16

[0354] TTL=6.43

[0355] Area data

[0356] Composition lens data

[0357]

[0358] Aspheric surface data

[0359]

[0360] The imaging lens of Example 5 achieves an overall aspect ratio of 0.62 and an F value of 1.90. In addition, as shown in Table 6, conditional expressions (1) to (24) are satisfied.

[0361] 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.

[0362] Table 6 shows the values ​​of conditional expressions (1) to (24) according to Examples 1 to 5.

[0363] [Table 6]

[0364]

[0365] Industrial Applicability

[0366] 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.

[0367] Description of Reference Numerals

[0368] ST Aperture Stop,

[0369] L1 first lens,

[0370] L2 Second lens,

[0371] L3 third lens,

[0372] L4 fourth lens,

[0373] L5 fifth lens,

[0374] L6 Sixth lens,

[0375] IR filter,

[0376] IMG camera surface.

Claims

1. A camera lens, characterized in that: From the object side to the image side, they include: A first lens having positive optical power; A second lens having negative optical power; A third lens having positive or negative optical power; a fourth lens having negative optical power; a fifth lens having positive refractive power; and a sixth lens having negative optical power; The first lens is in a meniscus shape with a convex surface facing the object side in the paraxial zone, the second lens has a convex surface facing the object side in the paraxial zone, the sixth lens has a concave surface facing the image side in the paraxial zone, and the object-side surface of the sixth lens has a concave surface facing the object side in the paraxial zone, satisfying the following conditional equations (1), (2), (3) and (4): (1)f4 / f<-13.00 (2)0.10＜(r6 / |f3|)×100＜55.00 (3)7.50＜r7 / T3＜20.00 (4)33.00<νd3<79.00 in, f4: focal length of the fourth lens, f: focal length of the entire camera lens system, r6: paraxial curvature radius of the image side of the third lens, f3: focal length of the third lens, r7: the paraxial radius of curvature of the object side of the fourth lens, T3: The distance on the optical axis from the image side of the third lens to the object side of the fourth lens. νd3: The dispersion coefficient of the third lens with respect to the d-line.

2. The imaging lens according to claim 1, wherein: The following condition (5) is satisfied: (5)0.50＜r2 / f1＜1.50 in, r2: paraxial radius of curvature of the image side of the first lens, f1: focal length of the first lens.

3. The imaging lens according to claim 1, wherein: The following condition (6) is satisfied: (6)0.02＜r3 / r4＜2.00 in, r3: the paraxial radius of curvature of the object side of the second lens, r4: paraxial radius of curvature of the image-side surface of the second lens.

4. The imaging lens according to claim 1, wherein: The following condition (7) is satisfied: (7)|r9| / r10＜-8.40 in, r9: the paraxial radius of curvature of the object side of the fifth lens, r10: paraxial curvature radius of the image-side surface of the fifth lens.

5. The imaging lens according to claim 1, wherein: The following condition (8) is satisfied: (8)0.20＜r8 / f＜1.20 in, r8: paraxial curvature radius of the image side of the fourth lens, f: Focal length of the entire camera lens system.

Images