CN105572839A - Imaging lens - Google Patents
Imaging lens Download PDFInfo
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- CN105572839A CN105572839A CN201410529850.0A CN201410529850A CN105572839A CN 105572839 A CN105572839 A CN 105572839A CN 201410529850 A CN201410529850 A CN 201410529850A CN 105572839 A CN105572839 A CN 105572839A
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Abstract
The invention relates to an imaging lens, which, from an objective side to an image side, sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along an optical axis. The first lens is the biconvex lens, which has the positive refractive power. The second lens is the convex-concave lens, and has the negative refractive power, and the convex surface of the second lens faces the objective side, and the concave surface of the second lens faces the image side. The third lens has the positive refractive power, and the convex surface of the third lens faces the image side. The fourth lens is the concave-convex lens, and has the negative refractive power. The concave surface of the fourth lens faces the objective side, and the convex surface of the fourth lens faces the image side. The fifth lens is the concave-convex lens, and has the negative refractive power. The concave surface of the fifth lens faces the objective side, and the convex surface of the fifth lens faces the image side. The sixth lens is the convex-concave lens, and has the positive refractive power. The convex surface of the sixth lens faces the objective side, and the concave surface of the sixth lens faces the image side.
Description
Technical field
The present invention has about a kind of imaging lens.
Background technology
Digital camera and hand several constantly past high picture element and lightweight develop, and make miniaturization and have high-resolution camera lens module demand to increase.The camera lens module of five known lens compositions cannot meet demand now, needs the camera lens module of another kind of new architecture, could meet miniaturization and high-resolution demand simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is, cannot take into account miniaturization and high-resolution defect, provide a kind of imaging lens, can take into account miniaturization and high resolving power for camera lens module of the prior art.
The technical scheme that the present invention adopts for its technical matters of solution is, provides a kind of imaging lens sequentially to comprise the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens along optical axis from thing side to image side.First lens are that biconvex lens has positive refractive power.Second lens are that meniscus has negative refractive power, the second lens convex surface facing concave surface facing image side, thing side.3rd lens have positive refractive power and comprise convex surface facing image side.4th lens are that concave-convex lens has negative refractive power, and the concave surface facing thing side of the 4th lens is convex surface facing image side.5th lens are that concave-convex lens has negative refractive power, and the concave surface facing thing side of the 5th lens is convex surface facing image side.6th lens are that meniscus has positive refractive power, the 6th lens convex surface facing concave surface facing image side, thing side.
Wherein imaging lens meets the following conditions: 0.8104≤fTTL≤0.8201; Wherein, f is the effective focal length of imaging lens, and TTL is that the thing side surface of the first lens is to the distance of imaging surface on optical axis.
Wherein the 4th lens and the 6th lens meet the following conditions: 0.1357≤| (R
41-R
42)/(R
41+ R
42) |+| (R
61-R
62)/(R
61+ R
62) |≤0.1694; Wherein, R41 is the radius-of-curvature of the thing side of the 4th lens, and R42 is the radius-of-curvature in the face, image side of the 4th lens, and R61 is the radius-of-curvature of the thing side of the 6th lens, and R62 is the radius-of-curvature in the face, image side of the 6th lens.
Wherein the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens meet the following conditions :-0.4290≤f
123/ f
456≤-0.4127; Wherein, f123 is the combination effective focal length of the first lens, the second lens and the 3rd lens, and f456 is the combination effective focal length of the 4th lens, the 5th lens and the 6th lens.
Wherein the 4th lens meet the following conditions :-14.8795≤f
4/ f≤-11.913; Wherein, f4 is the effective focal length of the 4th lens, and f is the effective focal length of imaging lens.
Wherein the 5th lens meet the following conditions :-2.7543≤f
5/ f≤-2.2539; Wherein, f5 is the effective focal length of the 5th lens, and f is the effective focal length of imaging lens.
Wherein the 6th lens meet the following conditions: 9.0882≤f
6/ f≤63.4223; Wherein, f6 is the effective focal length of the 6th lens, and f is the effective focal length of imaging lens.
Wherein each lens of the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens are at least simultaneously all non-spherical surface for non-spherical surface or two faces.
Wherein the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens are made up of plastic material.
Imaging lens of the present invention more can comprise aperture, is arranged between thing side and the first lens.
Implement imaging lens of the present invention, there is following beneficial effect: its camera lens total length is short and small, visual angle is comparatively large, but still has good optical property, and resolution of lens also can meet the demands.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, preferred embodiment cited below particularly also coordinates accompanying drawing to elaborate.
Accompanying drawing explanation
Fig. 1 is lens configuration according to the first embodiment of imaging lens of the present invention and light path schematic diagram.
Fig. 2 A is the longitudinal spherical aberration figure of the imaging lens of Fig. 1.
Fig. 2 B is the astigmatism curvature of field figure of the imaging lens of Fig. 1.
Fig. 2 C is the distortion figure of the imaging lens of Fig. 1.
Fig. 3 is lens configuration according to the second embodiment of imaging lens of the present invention and light path schematic diagram.
Fig. 4 A is the longitudinal spherical aberration figure of the imaging lens of Fig. 3.
Fig. 4 B is the astigmatism curvature of field figure of the imaging lens of Fig. 3.
Fig. 4 C is the distortion figure of the imaging lens of Fig. 3.
Fig. 5 is lens configuration according to the 3rd embodiment of imaging lens of the present invention and light path schematic diagram.
Fig. 6 A is the longitudinal spherical aberration figure of the imaging lens of Fig. 5.
Fig. 6 B is the astigmatism curvature of field figure of the imaging lens of Fig. 5.
Fig. 6 C is the distortion figure of the imaging lens of Fig. 5.
Embodiment
Refer to Fig. 1, Fig. 1 is lens configuration according to the first embodiment of imaging lens of the present invention and light path schematic diagram.Imaging lens 1 sequentially comprises aperture ST1, the first lens L11, the second lens L12, the 3rd lens L13, the 4th lens L14, the 5th lens L15, the 6th lens L16 and optical filter OF1 along optical axis OA1 from thing side to image side.First lens L11 has positive refractive power and is made up of plastic material, and its thing side S12 is convex surface image side face S13 is convex surface, and thing side S12 and face, image side S13 is all non-spherical surface.Second lens L12 has negative refractive power and is made up of plastic material, and its thing side S14 is convex surface image side face S15 is concave surface, and thing side S14 and face, image side S15 is all non-spherical surface.3rd lens L13 has positive refractive power and is made up of plastic material, and its thing side S16 is concave surface, and face, image side S17 is convex surface, and thing side S16 and face, image side S17 is all non-spherical surface.4th lens L14 has negative refractive power and is made up of plastic material, and its thing side S18 is concave surface image side face S19 is convex surface, and thing side S18 and face, image side S19 is all non-spherical surface.5th lens L15 has negative refractive power and is made up of plastic material, and its thing side S110 is concave surface image side face S111 is convex surface, and thing side S110 and face, image side S111 is all non-spherical surface.6th lens L16 has positive refractive power and is made up of plastic material, and its thing side S112 is convex surface image side face S113 is concave surface, and thing side S112 and face, image side S113 is all non-spherical surface.Its thing side S114 of optical filter OF1 and face, image side S115 is all plane.
In addition, for making imaging lens of the present invention keep good optical property, the imaging lens 1 in the first embodiment need meet beneath six conditions:
0.8104≤f1/TTL1≤0.8201(1)
0.1357≤|(R1
41-R1
42)/(R1
41+R1
42)|+|(R1
61-R1
62)/(R1
61+R1
62)|≤0.1694
(2)
-0.4290≤f1
123/f1
456≤-0.4127(3)
-14.8795≤f1
4/f1≤-11.913(4)
-2.7543≤f1
5/f1≤-2.2539(5)
9.0882≤f1
6/f1≤63.4223(6)
Wherein, f1 is the effective focal length of imaging lens 1, and TTL1 is the distance of thing side S12 to imaging surface IMA1 on optical axis OA1 of the first lens L11, R1
41be the radius-of-curvature of the thing side S18 of the 4th lens L14, R1
42be the radius-of-curvature of face, the image side S19 of the 4th lens L14, R1
61be the radius-of-curvature of the thing side S112 of the 6th lens L16, R1
62be the radius-of-curvature of face, the image side S113 of the 6th lens L16, f1
123be the combination effective focal length of the first lens L11, the second lens L12 and the 3rd lens L13, f1
456be the combination effective focal length of the 4th lens L14, the 5th lens L15 and the 6th lens L16, f1
4be the effective focal length of the 4th lens L14, f1
5be the effective focal length of the 5th lens L15, f1
6it is the effective focal length of the 6th lens L16.
Utilize the design of said lens and aperture ST1, make imaging lens 1 effectively can shorten camera lens total length, improve visual angle, effectively revise aberration, promote resolution of lens.
Table one is the correlation parameter table of each lens of imaging lens 1 in Fig. 1, and the effective focal length that table one data show the imaging lens 1 of the present embodiment equals 4.202mm, f-number equals 2.2, visual angle equals 68.8 °, camera lens total length equals 5.123mm.
Table one
In table one, the non-spherical surface depression degree z of each lens obtained by following formula:
z＝ch
2/{1+[1-(k+1)c
2h
2]
1/2}+Ah
4+Bh
6+Ch
8+Dh
10+Eh
12+Fh
14+Gh
16
Wherein:
C: curvature;
H: lens surface any point is to the vertical range of optical axis;
K: circular cone coefficient;
A ~ G: asphericity coefficient.
Table two is the correlation parameter table of the non-spherical surface of each lens in table one, and wherein k is circular cone coefficient (ConicConstant), A ~ G is asphericity coefficient.
Table two
The distance TTL1=5.123mm of thing side S12 to imaging lens women's head-ornaments IMA1 on optical axis OA1 of its effective focal length f1=4.202mm of imaging lens 1 of the first embodiment, the first lens L11, the radius of curvature R 1 of the thing side S18 of the 4th lens L14
41the radius of curvature R 1 of face, the image side S19 of=-3.54677mm, the 4th lens L14
42the radius of curvature R 1 of the thing side S112 of=-4.07026mm, the 6th lens L16
61the radius of curvature R 1 of face, the image side S113 of=2.37665mm, the 6th lens L16
62the combination effective focal length f1 of=2.04121mm, the first lens L11, the second lens L12 and the 3rd lens L13
123the combination effective focal length f1 of=3.4026mm, the 4th lens L14, the 5th lens L15 and the 6th lens L16
456=-8.2153mm, the effective focal length f1 of the 4th lens L14
4=-62.5167mm, the effective focal length f1 of the 5th lens L15
5=-11.00288mm, the effective focal length f1 of the 6th lens L16
6=171.08238mm, by above-mentioned data can obtain f1/TTL1=0.8201, | (R1
41-R1
42)/(R1
41+ R1
42) |+| (R1
61-R1
62)/(R1
61+ R1
62) |=0.1447, f1
123/ f1
456=-0.4142, f1
4/ f1=-14.8795, f1
5/ f1=-2.6188, f1
6/ f1=40.7191, all can meet the requirement of above-mentioned condition (1) to condition (6).
In addition, the optical property of the imaging lens 1 of the first embodiment also can reach requirement, and this can find out from Fig. 2 A to 2C.Shown in Fig. 2 A, be longitudinal spherical aberration (LongitudinalSphericalAberration) figure of the imaging lens 1 of the first embodiment.Shown in Fig. 2 B, be the astigmatism curvature of field (AstigmaticFieldCurves) figure of the imaging lens 1 of the first embodiment.Shown in Fig. 2 C, be distortion (Distortion) figure of the imaging lens 1 of the first embodiment.
Can be found out by Fig. 2 A, the longitudinal spherical aberration value that the light that imaging lens 1 pair of wavelength of the first embodiment is 435.8400nm, 546.0700nm, 656.2800nm produces is between 0.000mm to 0.030mm.By Fig. 2 B, (three lines in the sagitta of arc direction in figure almost overlap, three lines of meridian direction also almost overlap, so that seem to only have two-lines) can find out, imaging lens 1 pair of wavelength of first embodiment is the light of 435.8400nm, 546.0700nm, 656.2800nm, and the astigmatism curvature of field in meridian (Tangential) direction and the sagitta of arc (Sagittal) direction is between-0.025 ㎜ to 0.025 ㎜.By Fig. 2 C, (three lines in figure almost overlap, so that seem to only have a line) can find out, the distortion that the light that imaging lens 1 pair of wavelength of the first embodiment is 435.8400nm, 546.0700nm, 656.2800nm produces is between 0% to 2.1%.The longitudinal spherical aberration of the imaging lens 1 of obvious first embodiment, the astigmatism curvature of field, distortion effectively can be revised, thus are obtained preferably optical property.
Refer to Fig. 3, Fig. 3 is lens configuration according to the second embodiment of imaging lens of the present invention and light path schematic diagram.Imaging lens 2 sequentially comprises aperture ST2, the first lens L21, the second lens L22, the 3rd lens L23, the 4th lens L24, the 5th lens L25, the 6th lens L26 and optical filter OF2 along optical axis OA2 from thing side to image side.First lens L21 has positive refractive power and is made up of plastic material, and its thing side S22 is convex surface image side face S23 is convex surface, and thing side S22 and face, image side S23 is all non-spherical surface.Second lens L22 has negative refractive power and is made up of plastic material, and its thing side S24 is convex surface image side face S25 is concave surface, and thing side S24 and face, image side S25 is all non-spherical surface.3rd lens L23 has positive refractive power and is made up of plastic material, and its thing side S26 is concave surface image side face S27 is convex surface, and thing side S26 and face, image side S27 is all non-spherical surface.4th lens L24 has negative refractive power and is made up of plastic material, and its thing side S28 is concave surface image side face S29 is convex surface, and thing side S28 and face, image side S29 is all non-spherical surface.5th lens L25 has negative refractive power and is made up of plastic material, and its thing side S210 is concave surface image side face S211 is convex surface, and thing side S210 and face, image side S211 is all non-spherical surface.6th lens L26 has positive refractive power and is made up of plastic material, and its thing side S212 is convex surface image side face S213 is concave surface, and thing side S212 and face, image side S213 is all non-spherical surface.Its thing side S214 of optical filter OF2 and face, image side S215 is all plane.
In addition, for making imaging lens of the present invention keep good optical property, the imaging lens 2 in the second embodiment need meet beneath six conditions:
0.8104≤f2TTL2≤0.8201(7)
0.1357≤|(R2
41-R2
42)/(R2
41+R2
42)|+|(R2
61-R2
62)/(R2
61+R2
62)|≤0.1694
(8)
-0.4290≤f2
123/f2
456≤-0.4127(9)
-14.8795≤f2
4/f2≤-11.913(10)
-2.7543≤f2
5/f2≤-2.2539(11)
9.0882≤f2
6/f2≤63.4223(12)
Wherein, f2 is the effective focal length of imaging lens 2, and TTL2 is the distance of thing side S22 to imaging surface IMA2 on optical axis OA2 of the first lens L21, R2
41be the radius-of-curvature of the thing side S28 of the 4th lens L24, R2
42be the radius-of-curvature of face, the image side S29 of the 4th lens L24, R2
61be the radius-of-curvature of the thing side S212 of the 6th lens L26, R2
62be the radius-of-curvature of face, the image side S213 of the 6th lens L26, f2
123be the combination effective focal length of the first lens L21, the second lens L22 and the 3rd lens L23, f2
456be the combination effective focal length of the 4th lens L24, the 5th lens L25 and the 6th lens L26, f2
4be the effective focal length of the 4th lens L24, f2
5be the effective focal length of the 5th lens L25, f2
6it is the effective focal length of the 6th lens L26.
Utilize the design of said lens and aperture ST2, make imaging lens 2 effectively can shorten camera lens total length, improve visual angle, effectively revise aberration, promote resolution of lens.
Table three is the correlation parameter table of each lens of imaging lens 2 in Fig. 3, and the effective focal length that table three data show the imaging lens 2 of the present embodiment equals 4.212mm, f-number equals 2.2, visual angle equals 68.6 °, camera lens total length equals 5.185mm.
Table three
In table three, the non-spherical surface depression degree z of each lens obtained by following formula:
z＝ch
2/{1+[1-(k+1)c
2h
2]
1/2}+Ah
4+Bh
6+Ch
8+Dh
10+Eh
12+Fh
14+Gh
16
Wherein:
C: curvature;
H: lens surface any point is to the vertical range of optical axis;
K: circular cone coefficient;
A ~ G: asphericity coefficient.
Table four is the correlation parameter table of the non-spherical surface of each lens in table three, and wherein k is circular cone coefficient (ConicConstant), A ~ G is asphericity coefficient.
Table four
The distance TTL2=5.185mm of thing side S22 to imaging lens women's head-ornaments IMA2 on optical axis OA2 of its effective focal length f2=4.212mm of imaging lens 2 of the second embodiment, the first lens L21, the radius of curvature R 2 of the thing side S28 of the 4th lens L24
41the radius of curvature R 2 of face, the image side S29 of=-3.54017mm, the 4th lens L24
42the radius of curvature R 2 of the thing side S212 of=-4.17889mm, the 6th lens L26
61the radius of curvature R 2 of face, the image side S213 of=2.04140mm, the 6th lens L26
62the combination effective focal length f2 of=1.83593mm, the first lens L21, the second lens L22 and the 3rd lens L23
123the combination effective focal length f2 of=3.4926mm, the 4th lens L24, the 5th lens L25 and the 6th lens L26
456=-8.1406mm, the effective focal length f2 of the 4th lens L24
4=-50.1648mm, the effective focal length f2 of the 5th lens L25
5=-9.49230mm, the effective focal length f2 of the 6th lens L26
6=38.27514mm, by above-mentioned data can obtain f2/TTL2=0.8122, | (R2
41-R2
42)/(R2
41+ R2
42) |+| (R2
61-R2
62)/(R2
61+ R2
62) |=0.1357, f2
123/ f2
456=-0.4290, f2
4/ f2=-11.9113, f2
5/ f2=-2.2539, f2
6/ f2=9.0882, all can meet the requirement of above-mentioned condition (7) to condition (12).
In addition, the optical property of the imaging lens 2 of the second embodiment also can reach requirement, and this can find out from Fig. 4 A to 4C.Shown in Fig. 4 A, be longitudinal spherical aberration (LongitudinalSphericalAberration) figure of the imaging lens 2 of the second embodiment.Shown in Fig. 4 B, be the astigmatism curvature of field (AstigmaticFieldCurves) figure of the imaging lens 2 of the second embodiment.Shown in Fig. 4 C, be distortion (Distortion) figure of the imaging lens 2 of the second embodiment.
Can be found out by Fig. 4 A, the longitudinal spherical aberration value that the light that imaging lens 2 pairs of wavelength of the second embodiment are 435.8400nm, 546.0700nm, 656.2800nm produces is between-0.002mm to 0.040mm.By Fig. 4 B, (three lines in the sagitta of arc direction in figure almost overlap, three lines of meridian direction also almost overlap, so that seem to only have two-lines) can find out, imaging lens 2 pairs of wavelength of second embodiment are the light of 435.8400nm, 546.0700nm, 656.2800nm, and the astigmatism curvature of field in meridian (Tangential) direction and the sagitta of arc (Sagittal) direction is between-0.025 ㎜ to 0.025 ㎜.By Fig. 4 C, (three lines in figure almost overlap, so that seem to only have a line) can find out, the distortion that the light that imaging lens 2 pairs of wavelength of the second embodiment are 435.8400nm, 546.0700nm, 656.2800nm produces is between 0% to 2.0%.The longitudinal spherical aberration of the imaging lens 2 of obvious second embodiment, the astigmatism curvature of field, distortion effectively can be revised, thus are obtained preferably optical property.
Refer to Fig. 5, Fig. 5 is lens configuration according to the 3rd embodiment of imaging lens of the present invention and light path schematic diagram.Imaging lens 3 sequentially comprises aperture ST3, the first lens L31, the second lens L32, the 3rd lens L33, the 4th lens L34, the 5th lens L35, the 6th lens L36 and optical filter OF3 along optical axis OA3 from thing side to image side.First lens L31 has positive refractive power and is made up of plastic material, and its thing side S32 is convex surface image side face S33 is convex surface, and thing side S32 and face, image side S33 is all non-spherical surface.Second lens L32 has negative refractive power and is made up of plastic material, and its thing side S34 is convex surface image side face S35 is concave surface, and thing side S34 and face, image side S35 is all non-spherical surface.3rd lens L33 has positive refractive power and is made up of plastic material, and its thing side S36 is concave surface image side face S37 is convex surface, and thing side S36 and face, image side S37 is all non-spherical surface.4th lens L34 has negative refractive power and is made up of plastic material, and its thing side S38 is concave surface image side face S39 is convex surface, and thing side S38 and face, image side S39 is all non-spherical surface.5th lens L35 has negative refractive power and is made up of plastic material, and its thing side S310 is concave surface image side face S311 is convex surface, and thing side S310 and face, image side S311 is all non-spherical surface.6th lens L36 has positive refractive power and is made up of plastic material, and its thing side S312 is convex surface image side face S313 is concave surface, and thing side S312 and face, image side S313 is all non-spherical surface.Its thing side S314 of optical filter OF3 and face, image side S315 is all plane.
In addition, for making imaging lens of the present invention keep good optical property, the imaging lens 3 in the 3rd embodiment need meet beneath six conditions:
0.8104≤f3TTL3≤0.8201(13)
0.1357≤|(R3
41-R3
42)/(R3
41+R3
42)|+|(R3
61-R3
62)/(R3
61+R3
62)|≤0.1694
(14)
-0.4290≤f3
123/f3
456≤-0.4127(15)
-14.8795≤f3
4/f3≤-11.913(16)
-2.7543≤f3
5/f3≤-2.2539(17)
9.0882≤f3
6/f3≤63.4223(18)
Wherein, f3 is the effective focal length of imaging lens 3, and TTL3 is the distance of thing side S32 to imaging surface IMA3 on optical axis OA3 of the first lens L31, R3
41be the radius-of-curvature of the thing side S38 of the 4th lens L34, R3
42be the radius-of-curvature of face, the image side S39 of the 4th lens L34, R3
61be the radius-of-curvature of the thing side S312 of the 6th lens L36, R3
62be the radius-of-curvature of face, the image side S313 of the 6th lens L36, f3
123be the combination effective focal length of the first lens L31, the second lens L32 and the 3rd lens L33, f3
456be the combination effective focal length of the 4th lens L34, the 5th lens L35 and the 6th lens L36, f3
4be the effective focal length of the 4th lens L34, f3
5be the effective focal length of the 5th lens L35, f3
6it is the effective focal length of the 6th lens L36.
Utilize the design of said lens and aperture ST3, make imaging lens 3 effectively can shorten camera lens total length, improve visual angle, effectively revise aberration, promote resolution of lens.
Table five is the correlation parameter table of each lens of imaging lens 3 in Fig. 5, and the effective focal length that table five data show the imaging lens 3 of the present embodiment equals 4.179mm, f-number equals 2.2, visual angle equals 69.1 °, camera lens total length equals 5.157mm.
Table five
In table five, the non-spherical surface depression degree z of each lens obtained by following formula:
z＝ch
2/{1+[1-(k+1)c
2h
2]
1/2}+Ah
4+Bh
6+Ch
8+Dh
10+Eh
12+Fh
14+Gh
16
Wherein:
C: curvature;
H: lens surface any point is to the vertical range of optical axis;
K: circular cone coefficient;
A ~ G: asphericity coefficient.
Table six is the correlation parameter table of the non-spherical surface of each lens in table five, and wherein k is circular cone coefficient (ConicConstant), A ~ G is asphericity coefficient.
Table six
The distance TTL3=5.157mm of thing side S32 to imaging lens women's head-ornaments IMA3 on optical axis OA3 of its effective focal length f3=4.179mm of imaging lens 3 of the 3rd embodiment, the first lens L31, the radius of curvature R 3 of the thing side S38 of the 4th lens L34
41the radius of curvature R 3 of face, the image side S39 of=-3.80604mm, the 4th lens L34
42the radius of curvature R 3 of the thing side S312 of=-4.51819mm, the 6th lens L36
61the radius of curvature R 3 of face, the image side S313 of=2.23621mm, the 6th lens L36
62the combination effective focal length f3 of=1.89031mm, the first lens L31, the second lens L32 and the 3rd lens L33
123the combination effective focal length f3 of=3.3528mm, the 4th lens L34, the 5th lens L35 and the 6th lens L36
456=-8.1241mm, the effective focal length f3 of the 4th lens L34
4=-52.4200mm, the effective focal length f3 of the 5th lens L35
5=-11.51063mm, the effective focal length f3 of the 6th lens L36
6=265.05399mm, by above-mentioned data can obtain f3/TTL3=0.8104, | (R3
41-R3
42)/(R3
41+ R3
42) |+| (R3
61-R3
62)/(R3
61+ R3
62) |=0.1649, f3
123/ f3
456=-0.4127, f3
4/ f3=-12.5431, f3
5/ f3=-2.7543, f3
6/ f3=63.4223, all can meet the requirement of above-mentioned condition (13) to condition (18).
In addition, the optical property of the imaging lens 3 of the 3rd embodiment also can reach requirement, and this can find out from Fig. 6 A to 6C.Shown in Fig. 6 A, be longitudinal spherical aberration (LongitudinalSphericalAberration) figure of the imaging lens 3 of the 3rd embodiment.Shown in Fig. 6 B, be the astigmatism curvature of field (AstigmaticFieldCurves) figure of the imaging lens 3 of the 3rd embodiment.Shown in Fig. 6 C, be distortion (Distortion) figure of the imaging lens 3 of the 3rd embodiment.
Can be found out by Fig. 6 A, the longitudinal spherical aberration value that the light that imaging lens 3 pairs of wavelength of the 3rd embodiment are 435.8400nm, 546.0700nm, 656.2800nm produces is between 0.000mm to 0.038mm.By Fig. 6 B, (three lines in the sagitta of arc direction in figure almost overlap, three lines of meridian direction also almost overlap, so that seem to only have two-lines) can find out, imaging lens 3 pairs of wavelength of 3rd embodiment are the light of 435.8400nm, 546.0700nm, 656.2800nm, and the astigmatism curvature of field in meridian (Tangential) direction and the sagitta of arc (Sagittal) direction is between-0.025 ㎜ to 0.025 ㎜.By Fig. 6 C, (three lines in figure almost overlap, so that seem to only have a line) can find out, the distortion that the light that imaging lens 3 pairs of wavelength of the 3rd embodiment are 435.8400nm, 546.0700nm, 656.2800nm produces is between 0% to 2.1%.The longitudinal spherical aberration of the imaging lens 3 of obvious 3rd embodiment, the astigmatism curvature of field, distortion effectively can be revised, thus are obtained preferably optical property.
In above-described embodiment, thing side and the face, image side of the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens are all non-spherical surface, but can recognize, if it is non-spherical surface that each lens of the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens change at least one side into, also category of the present invention should be belonged to.
Although the present invention discloses as above with preferred embodiment; but it is also not used to limit the present invention, those skilled in the art, without departing from the spirit and scope of the present invention; still can do a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the claim person of defining.
Claims (10)
1. an imaging lens, is characterized in that, sequentially comprises along optical axis from thing side to image side:
First lens, these first lens are that biconvex lens has positive refractive power;
Second lens, these second lens are that meniscus has negative refractive power, these the second lens convex surface facing this image side concave surface facing, this thing side;
3rd lens, the 3rd lens have positive refractive power and comprise convex surface, should convex surface facing this image side;
4th lens, the 4th lens are that concave-convex lens has negative refractive power, and this thing side concave surface facing of the 4th lens is convex surface facing this image side;
5th lens, the 5th lens are that concave-convex lens has negative refractive power, and this thing side concave surface facing of the 5th lens is convex surface facing this image side; And
6th lens, the 6th lens are that meniscus has positive refractive power, the 6th lens convex surface facing this image side concave surface facing, this thing side.
2. imaging lens as claimed in claim 1, it is characterized in that, this imaging lens meets the following conditions:
0.8104≤f/TTL≤0.8201
Wherein, f is the effective focal length of this imaging lens, and TTL is that the thing side surface of these the first lens is to the distance of imaging surface on this optical axis.
3. imaging lens as claimed in claim 1, it is characterized in that, the 4th lens and the 6th lens meet the following conditions:
0.1357≤|(R
41-R
42)/(R
41+R
42)|+|(R
61-R
62)/(R
61+R
62)|≤0.1694
Wherein, R41 is the radius-of-curvature of the thing side of the 4th lens, and R42 is the radius-of-curvature in the face, image side of the 4th lens, and R61 is the radius-of-curvature of the thing side of the 6th lens, and R62 is the radius-of-curvature in the face, image side of the 6th lens.
4. imaging lens as claimed in claim 1, it is characterized in that, these first lens, these second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens meet the following conditions:
-0.4290≤f
123/f
456≤-0.4127
Wherein, f123 is the combination effective focal length of these first lens, these second lens and the 3rd lens, and f456 is the combination effective focal length of the 4th lens, the 5th lens and the 6th lens.
5. imaging lens as claimed in claim 1, it is characterized in that, the 4th lens meet the following conditions:
-14.8795≤f
4/f≤-11.913
Wherein, f4 is the effective focal length of the 4th lens, and f is the effective focal length of this imaging lens.
6. imaging lens as claimed in claim 1, it is characterized in that, the 5th lens meet the following conditions:
-2.7543≤f
5/f≤-2.2539
Wherein, f5 is the effective focal length of the 5th lens, and f is the effective focal length of this imaging lens.
7. imaging lens as claimed in claim 1, it is characterized in that, the 6th lens meet the following conditions:
9.0882≤f
6/f≤63.4223
Wherein, f6 is the effective focal length of the 6th lens, and f is the effective focal length of this imaging lens.
8. imaging lens as claimed in claim 1, it is characterized in that, each lens of these first lens, these second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens are at least simultaneously all non-spherical surface for non-spherical surface or two faces.
9. imaging lens as claimed in claim 1, it is characterized in that, the 6th lens are made up of plastic material.
10. imaging lens as claimed in claim 1, is characterized in that, more comprise aperture, be arranged between this thing side and this first lens.
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| CN201410529850.0A CN105572839B (en) | 2014-10-09 | 2014-10-09 | Imaging lens |
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| CN201410529850.0A CN105572839B (en) | 2014-10-09 | 2014-10-09 | Imaging lens |
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| CN105572839B CN105572839B (en) | 2017-12-26 |
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