CN108051902B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN108051902B CN108051902B CN201711151245.4A CN201711151245A CN108051902B CN 108051902 B CN108051902 B CN 108051902B CN 201711151245 A CN201711151245 A CN 201711151245A CN 108051902 B CN108051902 B CN 108051902B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 109
- 238000003384 imaging method Methods 0.000 claims abstract description 56
- 230000014509 gene expression Effects 0.000 claims description 12
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- 230000009286 beneficial effect Effects 0.000 description 9
- 238000013461 design Methods 0.000 description 8
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- 238000012937 correction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
Abstract
The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; and satisfies the following relationships: f1/f is more than or equal to 1 and less than or equal to 1.5, n4 is more than or equal to 1.7 and less than or equal to 2.2, and f3/f4 is more than or equal to 2; (R13+ R14)/(R13-R14) is not more than 0.5 and not more than 10; n6 is more than or equal to 1.7 and less than or equal to 2.2. The imaging optical lens can obtain high imaging performance and low TTL.
Description
Technical Field
The present invention relates to the field of optical lenses, and more particularly, to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging apparatuses such as monitors and PC lenses.
Background
In recent years, with the rise of smart phones, the demand of miniaturized camera lenses is increasing, and the photosensitive devices of general camera lenses are not limited to two types, namely, a Charge Coupled Device (CCD) or a Complementary Metal-oxide semiconductor (CMOS) Sensor, and due to the advanced semiconductor manufacturing process technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed with a good function, a light weight, a small size and a light weight, so that the miniaturized camera lenses with good imaging quality are the mainstream in the current market. In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts a three-piece or four-piece lens structure. Moreover, with the development of technology and the increase of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system on the imaging quality is continuously improved, five-piece, six-piece and seven-piece lens structures gradually appear in the design of the lens. A wide-angle imaging lens having excellent optical characteristics, being ultra-thin and having sufficient chromatic aberration correction is in demand.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an imaging optical lens that can satisfy the requirements of ultra-thinning and wide angle while achieving high imaging performance.
To solve the above-mentioned problems, an embodiment of the present invention provides an imaging optical lens, in order from an object side to an image side, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens;
the focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the refractive index of the fourth lens is n4, the refractive index of the sixth lens is n6, the radius of curvature of the object-side surface of the seventh lens is R13, the radius of curvature of the image-side surface of the seventh lens is R14, and the following relational expressions are satisfied:
1≤f1/f≤1.5,
1.7≤n4≤2.2,
-2≤f3/f4≤2；
0.5≤(R13+R14)/(R13-R14)≤10；
1.7≤n6≤2.2。
compared with the prior art, the embodiment of the invention utilizes the arrangement mode of the lenses and utilizes the common cooperation of the lenses with specific relation on data of focal length, refractive index, total optical length, axial thickness and curvature radius of the shooting optical lens, so that the shooting optical lens can meet the requirements of ultra-thinning and wide angle while obtaining high imaging performance.
Preferably, the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the image-side surface of the first lens is R2, and the on-axis thickness of the first lens is d1, and the following relationships are satisfied: -5.48 ≤ (R1+ R2)/(R1-R2) ≤ 1.45; d1 is more than or equal to 0.31 and less than or equal to 0.94.
Preferably, the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the focal length of the image pickup optical lens is f, the focal length of the second lens is f2, the curvature radius of the object side surface of the second lens is R3, the curvature radius of the image side surface of the second lens is R4, the on-axis thickness of the second lens is d3, and the following relational expression is satisfied: f2/f is not less than 7.65 and not more than-2.21; 2.46-8.4 of (R3+ R4)/(R3-R4); d3 is more than or equal to 0.1 and less than or equal to 0.29.
Preferably, the third lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the focal length of the image pickup optical lens is f, the focal length of the third lens is f3, the curvature radius of the object side surface of the third lens is R5, the curvature radius of the image side surface of the third lens is R6, the on-axis thickness of the third lens is d5, and the following relations are satisfied: f3/f is more than or equal to 0.92 and less than or equal to 3.32; -0.47 ≤ (R5+ R6)/(R5-R6) ≤ 0.07; d5 is more than or equal to 0.12 and less than or equal to 0.78.
Preferably, the fourth lens element with positive refractive power has a concave object-side surface and a convex image-side surface; the focal length of the image pickup optical lens is f, the focal length of the fourth lens is f4, the curvature radius of the object side surface of the fourth lens is R7, the curvature radius of the image side surface of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, and the following relational expression is satisfied: f4/f is more than or equal to 1.21 and less than or equal to 81.15; 1.3-121.79 of (R7+ R8)/(R7-R8); d7 is more than or equal to 0.17 and less than or equal to 0.84.
Preferably, the fifth lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the focal length of the image pickup optical lens is f, the focal length of the fifth lens is f5, the curvature radius of the object side surface of the fifth lens is R9, the curvature radius of the image side surface of the fifth lens is R10, the on-axis thickness of the fifth lens is d9, and the following relations are satisfied: f5/f is more than or equal to 2.83 and less than or equal to 29.37; -70.14 ≤ (R9+ R10)/(R9-R10) ≤ 5.08; d9 is more than or equal to 0.09 and less than or equal to 0.43.
Preferably, the sixth lens element with positive refractive power has a concave object-side surface and a convex image-side surface; the focal length of the imaging optical lens is f, the focal length of the sixth lens is f6, the curvature radius of the object side surface of the sixth lens is R11, the curvature radius of the image side surface of the sixth lens is R12, the on-axis thickness of the sixth lens is d11, and the following relations are satisfied: f6/f is more than or equal to 0.81 and less than or equal to 28.84; not less than 1.03 (R11+ R12)/(R11-R12) not more than 38.31; d11 is more than or equal to 0.09 and less than or equal to 0.26.
Preferably, the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the focal length of the image pickup optical lens is f, the focal length of the seventh lens is f7, the on-axis thickness of the seventh lens is d13, and the following relational expression is satisfied: f7/f is not less than 1.55 and not more than-0.45; d13 is more than or equal to 0.15 and less than or equal to 0.58.
Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 5.12 millimeters.
Preferably, the F-number of the imaging optical lens is less than or equal to 2.06.
The invention has the advantages that the optical camera lens has excellent optical characteristics, is ultrathin, has wide angle and can fully correct chromatic aberration, and is particularly suitable for mobile phone camera lens components and WEB camera lenses which are composed of high-pixel CCD, CMOS and other camera elements.
Drawings
Fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment of the present invention;
FIG. 2 is a schematic axial aberration diagram of the imaging optical lens of FIG. 1;
fig. 3 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 1;
FIG. 4 is a schematic view of curvature of field and distortion of the imaging optical lens of FIG. 1;
fig. 5 is a schematic configuration diagram of an imaging optical lens according to a second embodiment of the present invention;
FIG. 6 is a schematic axial aberration diagram of the imaging optical lens of FIG. 5;
fig. 7 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 5;
FIG. 8 is a schematic view of curvature of field and distortion of the imaging optical lens of FIG. 5;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.
(first embodiment)
Referring to the drawings, the present invention provides an image pickup optical lens 10. Fig. 1 shows an image pickup optical lens 10 according to a first embodiment of the present invention, and the image pickup optical lens 10 includes seven lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: a diaphragm S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. An optical element such as an optical filter (filter) GF may be disposed between the seventh lens L7 and the image plane Si.
The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of glass, the fifth lens L5 is made of plastic, the sixth lens L6 is made of glass, and the seventh lens L7 is made of plastic.
The focal length of the entire image pickup optical lens 10 is defined as f, the focal length of the first lens element L1 is defined as f1, 1 ≤ f1/f ≤ 1.5, and the positive refractive power of the first lens element L1 is defined. When the value exceeds the lower limit, the lens is advantageous for the ultra-thin lens, but the positive refractive power of the first lens element L1 is too strong to correct the aberration, and the lens is not advantageous for the wide angle. On the other hand, if the refractive power exceeds the upper limit predetermined value, the positive refractive power of the first lens element is too weak, and the lens barrel is difficult to be made thinner. Preferably, 1.05. ltoreq. f 1/f. ltoreq.1.5 is satisfied.
The refractive index of the fourth lens L4 is defined as n4, n4 is not less than 1.7 and not more than 2.2, the refractive index of the fourth lens L4 is defined, and the refractive index is more favorable for the development of ultra-thinness and correction of aberration in the range. Preferably, 1.8. ltoreq. n 4. ltoreq.2.1 is satisfied.
The focal length of the third lens L3 is defined as f3, the focal length of the fourth lens L4 is defined as f4, -2 is not less than f3/f4 is not more than 2, and the ratio of the focal length f3 of the third lens L3 to the focal length f4 of the fourth lens L4 is defined, so that the sensitivity of the optical lens group for shooting can be effectively reduced, and the imaging quality is further improved. Preferably, 0. ltoreq. f3/f 4. ltoreq.1 is satisfied.
The curvature radius of the object side surface of the seventh lens L7 is defined as R13, the curvature radius of the image side surface of the seventh lens L7 is defined as R14, 0.5 ≦ (R13+ R14)/(R13-R14) ≦ 10, and the shape of the seventh lens L7 is defined, so that it is difficult to correct off-axis aberration and other problems as the range is out of range, as the range is expanded to a super-thin wide angle. Preferably, 0.6. ltoreq. R13+ R14)/(R13-R14. ltoreq.5 is satisfied.
The refractive index of the sixth lens L6 is n6, n6 is more than or equal to 1.7 and less than or equal to 2.2, the refractive index of the sixth lens L6 is regulated, and ultra-thinning is facilitated. Preferably, 1.8. ltoreq. n 6. ltoreq.2.1 is satisfied.
When the focal length of the image pickup optical lens 10, the focal lengths of the respective lenses, the refractive indices of the respective lenses, the optical total length of the image pickup optical lens, the on-axis thickness, and the curvature radius satisfy the above-described relational expressions, the image pickup optical lens 10 can have high performance and meet the design requirement of low TTL.
In this embodiment, the object-side surface of the first lens element L1 is convex in the paraxial region thereof, and the image-side surface thereof is concave in the paraxial region thereof, and has positive refractive power.
The curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the following relations: -5.48 ≦ (R1+ R2)/(R1-R2) ≦ -1.45, the shape of the first lens being rationally controlled so that the first lens can effectively correct the system spherical aberration; preferably, -3.61. ltoreq. (R1+ R2)/(R1-R2). ltoreq-1.81.
The first lens L1 has an on-axis thickness d1, and satisfies the following relationship: d1 is more than or equal to 0.31 and less than or equal to 0.94, which is beneficial to realizing ultra-thinning. Preferably, 0.47. ltoreq. d 1. ltoreq.0.76.
In this embodiment, the object-side surface of the second lens element L2 is convex at the paraxial region thereof, and the image-side surface thereof is concave at the paraxial region thereof, and has negative refractive power.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the second lens L2 is f2, and the following relations are satisfied: 7.65 ≦ f2/f ≦ -2.21, by controlling the negative power of the second lens L2 to a reasonable range, to reasonably and effectively balance the negative spherical aberration produced by the first lens L1 having a positive power and the amount of curvature of field of the system. Preferably, -4.78. ltoreq. f 2/f. ltoreq-2.77.
The curvature radius R3 of the object side surface of the second lens L2 and the curvature radius R4 of the image side surface of the second lens L2 satisfy the following relations: 2.46 ≦ (R3+ R4)/(R3-R4) ≦ 8.4, and defines the shape of the second lens L2, and when out of range, it becomes difficult to correct the problem of chromatic aberration on the axis as the lens progresses toward an ultra-thin wide angle. Preferably, 3.93 ≦ (R3+ R4)/(R3-R4). ltoreq.6.72.
The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: d3 is more than or equal to 0.1 and less than or equal to 0.29, which is beneficial to realizing ultra-thinning. Preferably, 0.16. ltoreq. d 3. ltoreq.0.24.
In this embodiment, the object-side surface of the third lens element L3 is convex at the paraxial region thereof, and the image-side surface thereof is convex at the paraxial region thereof, and has positive refractive power.
The focal length of the entire image pickup optical lens 10 is f, the focal length of the third lens L3 is f3, and the following relationships are satisfied: f3/f is more than or equal to 0.92 and less than or equal to 3.32, which is beneficial to the system to obtain good ability of balancing curvature of field so as to effectively improve the image quality. Preferably, 1.47. ltoreq. f 3/f. ltoreq.2.65.
The curvature radius R5 of the object side surface of the third lens L3 and the curvature radius R6 of the image side surface of the third lens L3 satisfy the following relations: the ratio of (R5+ R6)/(R5-R6) is not less than 0.47 and not more than 0.07, the shape of the third lens L3 can be effectively controlled, the molding of the third lens L3 is facilitated, and the generation of poor molding and stress caused by the overlarge surface curvature of the third lens L3 is avoided. Preferably, -0.29 ≦ (R5+ R6)/(R5-R6) ≦ -0.09.
The on-axis thickness of the third lens L3 is d5, and satisfies the following relation: d5 is more than or equal to 0.12 and less than or equal to 0.78, which is beneficial to realizing ultra-thinning. Preferably, 0.19. ltoreq. d 5. ltoreq.0.62.
In this embodiment, the object-side surface of the fourth lens element L4 is concave in the paraxial region thereof, and the image-side surface thereof is convex in the paraxial region thereof, and has positive refractive power.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the fourth lens L4 is f4, and the following relations are satisfied: 1.21 ≦ f4/f ≦ 81.15, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 1.94 ≦ f4/f ≦ 64.92.
The curvature radius R7 of the object side surface of the fourth lens L4 and the curvature radius R8 of the image side surface of the fourth lens L4 satisfy the following relations: 1.3 ≦ (R7+ R8)/(R7-R8) ≦ 121.79, and the shape of the fourth lens L4 is specified, and when out of range, it becomes difficult to correct the aberration of the off-axis angle and the like with the development of an ultra-thin wide angle. Preferably, 2.07 ≦ (R7+ R8)/(R7-R8) ≦ 97.44.
The on-axis thickness of the fourth lens L4 is d7, and satisfies the following relation: d7 is more than or equal to 0.17 and less than or equal to 0.84, which is beneficial to realizing ultra-thinning. Preferably, 0.27. ltoreq. d 7. ltoreq.0.67.
In this embodiment, the object-side surface of the fifth lens element L5 is convex at the paraxial region thereof, and the image-side surface thereof is concave at the paraxial region thereof, and has positive refractive power.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the fifth lens L5 is f5, and the following relations are satisfied: f5/f is more than or equal to 2.83 and less than or equal to 29.37, and the definition of the fifth lens L5 can effectively make the light ray angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, 4.52 ≦ f5/f ≦ 23.5.
The curvature radius R9 of the object side surface of the fifth lens L5 and the curvature radius R10 of the image side surface of the fifth lens L5 satisfy the following relations: -70.14 ≦ (R9+ R10)/(R9-R10) ≦ -5.08, and the shape of the fifth lens L5 is specified, and when the condition is out of the range, it is difficult to correct the off-axis aberration and the like as the ultra-thin wide angle is developed. Preferably, -43.84 ≦ (R9+ R10)/(R9-R10). ltoreq.6.36.
The fifth lens L5 has an on-axis thickness d9, and satisfies the following relationship: d9 is more than or equal to 0.09 and less than or equal to 0.43, which is beneficial to realizing ultra-thinning. Preferably, 0.14. ltoreq. d 9. ltoreq.0.34.
In this embodiment, the object-side surface of the sixth lens element L6 is concave in the paraxial region thereof, and the image-side surface thereof is convex in the paraxial region thereof, and has positive refractive power.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the sixth lens L6 is f6, and the following relationships are satisfied: 0.81 ≦ f6/f ≦ 28.84, which allows better imaging quality and lower sensitivity of the system through reasonable distribution of the powers. Preferably, 1.29. ltoreq. f 6/f. ltoreq.23.07.
The curvature radius R11 of the object side surface of the sixth lens L6 and the curvature radius R12 of the image side surface of the sixth lens L6 satisfy the following relations: 1.03 ≦ (R11+ R12)/(R11-R12) ≦ 38.31, and the shape of the sixth lens L6 is specified, and when the condition is out of the range, it becomes difficult to correct the off-axis picture angle aberration and the like as the ultra-thin wide angle is developed. Preferably, 1.65 ≦ (R11+ R12)/(R11-R12). ltoreq.30.65.
The on-axis thickness of the sixth lens L6 is d11, and satisfies the following relation: d11 is more than or equal to 0.09 and less than or equal to 0.26, which is beneficial to realizing ultra-thinning. Preferably, 0.14. ltoreq. d 11. ltoreq.0.2.
In this embodiment, the object-side surface of the seventh lens element L7 is concave in the paraxial region thereof, and the image-side surface thereof is concave in the paraxial region thereof, and has negative refractive power.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the seventh lens L7 is f7, and the following relations are satisfied: -1.55 ≦ f7/f ≦ -0.45, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, -0.97. ltoreq. f 7/f. ltoreq-0.56.
The seventh lens L7 has an on-axis thickness d13, and satisfies the following relationship: d13 is more than or equal to 0.15 and less than or equal to 0.58, which is beneficial to realizing ultra-thinning. Preferably, 0.24. ltoreq. d 13. ltoreq.0.47.
In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 5.12 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 4.88.
In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.06 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 2.02 or less.
With such a design, the total optical length TTL of the entire imaging optical lens 10 can be made as short as possible, and the characteristic of miniaturization can be maintained.
The image pickup optical lens 10 of the present invention will be explained below by way of example. The symbols described in the respective examples are as follows. Distance, radius and center thickness are in mm.
TTL optical length (on-axis distance from the object-side surface of the 1 st lens L1 to the image plane);
preferably, the object side surface and/or the image side surface of the lens may be further provided with an inflection point and/or a stagnation point to meet the requirement of high-quality imaging.
The following shows design data of the image pickup optical lens 10 according to the first embodiment of the present invention, the units of focal length, distance, radius, and center thickness being mm.
Tables 1 and 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 1 ]
Wherein each symbol has the following meaning.
S1, diaphragm;
r is the curvature radius of the optical surface and the central curvature radius when the lens is used;
r1 radius of curvature of object-side surface of first lens L1;
r2 radius of curvature of image side surface of first lens L1;
r3 radius of curvature of object-side surface of second lens L2;
r4 radius of curvature of the image-side surface of the second lens L2;
r5 radius of curvature of object-side surface of third lens L3;
r6 radius of curvature of the image-side surface of the third lens L3;
r7 radius of curvature of object-side surface of fourth lens L4;
r8 radius of curvature of image side surface of the fourth lens L4;
r9 radius of curvature of object-side surface of fifth lens L5;
r10 radius of curvature of the image-side surface of the fifth lens L5;
r11 radius of curvature of object-side surface of sixth lens L6;
r12 radius of curvature of the image-side surface of the sixth lens L6;
r13 radius of curvature of object-side surface of seventh lens L7;
r14 radius of curvature of the image-side surface of the seventh lens L7;
r15 radius of curvature of the object side of the optical filter GF;
r16 radius of curvature of image side of optical filter GF;
d is the on-axis thickness of the lenses and the on-axis distance between the lenses;
d 0: the on-axis distance of the stop S1 to the object-side surface of the first lens L1;
d1: the on-axis thickness of the first lens L1;
d2: the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;
d3: the on-axis thickness of the second lens L2;
d4: the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;
d5: the on-axis thickness of the third lens L3;
d 6: the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;
d 7: the on-axis thickness of the fourth lens L4;
d 8: an on-axis distance from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5;
d 9: the on-axis thickness of the fifth lens L5;
d 10: an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6;
d 11: the on-axis thickness of the sixth lens L6;
d 12: an on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;
d 13: the on-axis thickness of the seventh lens L7;
d 14: the on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the optical filter GF;
d 15: on-axis thickness of the optical filter GF;
d 16: the on-axis distance from the image side surface of the optical filter GF to the image surface;
nd is the refractive index of the d line;
nd1 refractive index of d-line of the first lens L1;
nd2 refractive index of d-line of the second lens L2;
nd3 refractive index of d-line of the third lens L3;
nd4 refractive index of d-line of the fourth lens L4;
nd5 refractive index of d-line of the fifth lens L5;
nd 6: the refractive index of the d-line of the sixth lens L6;
nd 7: the refractive index of the d-line of the seventh lens L7;
ndg, refractive index of d-line of optical filter GF;
vd is Abbe number;
v 1: abbe number of the first lens L1;
v 2: abbe number of the second lens L2;
v 3: abbe number of the third lens L3;
v 4: abbe number of the fourth lens L4;
v 5: abbe number of the fifth lens L5;
v 6: abbe number of the sixth lens L6;
v 7: abbe number of the seventh lens L7;
vg: abbe number of the optical filter GF.
Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 2 ]
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14 and A16 are aspheric coefficients.
IH image height
y＝(x2/R)/[1+{1-(k+1)(x2/R2)}1/2]+A4x4+A6x6+A8x8+A10x10+A12x12+A14x14+A16x16(1)
For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).
Tables 3 and 4 show the inflection point and stagnation point design data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. Wherein, R1 and R2 represent the object-side surface and the image-side surface of the first lens L1, R3 and R4 represent the object-side surface and the image-side surface of the second lens L2, R5 and R6 represent the object-side surface and the image-side surface of the third lens L3, R7 and R8 represent the object-side surface and the image-side surface of the fourth lens L4, R9 and R10 represent the object-side surface and the image-side surface of the fifth lens L5, R11 and R12 represent the object-side surface and the image-side surface of the sixth lens L6, and R13 and R14 represent the object-side surface and the image-side surface of the seventh lens L7, respectively. The "inflection point position" field correspondence data is a vertical distance from an inflection point set on each lens surface to the optical axis of the image pickup optical lens 10. The "stagnation point position" field corresponding data is the vertical distance from the stagnation point set on each lens surface to the optical axis of the imaging optical lens 10.
[ TABLE 3 ]
[ TABLE 4 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| R5 | 2 | 0.725 | 0.945 |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| R9 | 1 | 0.555 | |
| R10 | 1 | 0.425 | |
| |
0 | ||
| |
0 | ||
| R13 | 0 | ||
| R14 | 1 | 0.955 |
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 486nm, 588nm, and 656nm passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing curvature of field and distortion of light having a wavelength of 588nm after passing through the imaging optical lens 10 according to the first embodiment, where S is curvature of field in the sagittal direction and T is curvature of field in the tangential direction in fig. 4.
Table 9 appearing later shows values corresponding to the parameters specified in the conditional expressions for the respective numerical values in examples 1 and 2.
As shown in table 9, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.967mm, a full field image height of 3.261mm, a diagonal field angle of 78.61 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(second embodiment)
The second embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 6 ]
Tables 7 and 8 show the inflection point and stagnation point design data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 7 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Position of reverse curvature 3 | |
| |
0 | |||
| R2 | 1 | 0.785 | ||
| R3 | 1 | 0.355 | ||
| |
0 | |||
| R5 | 2 | 0.445 | 0.935 | |
| |
0 | |||
| R7 | 1 | 0.875 | ||
| R8 | 1 | 1.035 | ||
| R9 | 1 | 0.325 | ||
| R10 | 1 | 0.255 | ||
| |
0 | |||
| R12 | 3 | 0.465 | 0.705 | 1.605 |
| R13 | 1 | 1.295 | ||
| R14 | 1 | 0.415 |
[ TABLE 8 ]
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 486nm, 588nm and 656nm passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 588nm after passing through the imaging optical lens 20 according to the second embodiment.
As shown in table 9, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.932mm, a full field height of 3.261mm, a diagonal field angle of 80.33 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 9 ]
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. An imaging optical lens, in order from an object side to an image side, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens;
the first lens element with positive refractive power, the second lens element with negative refractive power, the third lens element with positive refractive power, the fourth lens element with positive refractive power, the fifth lens element with positive refractive power, the sixth lens element with positive refractive power, and the seventh lens element with negative refractive power;
the focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the refractive index of the fourth lens is n4, the refractive index of the sixth lens is n6, the radius of curvature of the object-side surface of the seventh lens is R13, the radius of curvature of the image-side surface of the seventh lens is R14, and the following relational expressions are satisfied:
1≤f1/f≤1.5,
1.8≤n4≤2.1624,
0≤f3/f4≤1；
0.5≤(R13+R14)/(R13-R14)≤5；
1.8≤n6≤1.9809。
2. the imaging optical lens assembly of claim 1, wherein the first lens element has a convex object-side surface and a concave image-side surface;
the radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the image-side surface of the first lens is R2, and the on-axis thickness of the first lens is d1, and the following relationships are satisfied:
-5.48≤(R1+R2)/(R1-R2)≤-1.45；
0.31mm≤d1≤0.94mm。
3. the imaging optical lens assembly of claim 1, wherein the second lens element has a convex object-side surface and a concave image-side surface;
the focal length of the image pickup optical lens is f, the focal length of the second lens is f2, the curvature radius of the object side surface of the second lens is R3, the curvature radius of the image side surface of the second lens is R4, the on-axis thickness of the second lens is d3, and the following relational expression is satisfied:
-7.65≤f2/f≤-2.21；
2.46≤(R3+R4)/(R3-R4)≤8.4；
0.1mm≤d3≤0.29mm。
4. the imaging optical lens assembly of claim 1, wherein the third lens element has a convex object-side surface and a convex image-side surface;
the focal length of the image pickup optical lens is f, the focal length of the third lens is f3, the curvature radius of the object side surface of the third lens is R5, the curvature radius of the image side surface of the third lens is R6, the on-axis thickness of the third lens is d5, and the following relations are satisfied:
0.92≤f3/f≤3.32；
-0.47≤(R5+R6)/(R5-R6)≤-0.07；
0.12mm≤d5≤0.78mm。
5. the imaging optical lens assembly according to claim 1, wherein the fourth lens element has a concave object-side surface and a convex image-side surface;
the focal length of the image pickup optical lens is f, the focal length of the fourth lens is f4, the curvature radius of the object side surface of the fourth lens is R7, the curvature radius of the image side surface of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, and the following relational expression is satisfied:
1.21≤f4/f≤81.15；
1.3≤(R7+R8)/(R7-R8)≤121.79；
0.17mm≤d7≤0.84mm。
6. the imaging optical lens assembly according to claim 1, wherein the fifth lens element has a convex object-side surface and a concave image-side surface;
the focal length of the image pickup optical lens is f, the focal length of the fifth lens is f5, the curvature radius of the object side surface of the fifth lens is R9, the curvature radius of the image side surface of the fifth lens is R10, the on-axis thickness of the fifth lens is d9, and the following relations are satisfied:
2.83≤f5/f≤29.37；
-70.14≤(R9+R10)/(R9-R10)≤-5.08；
0.09mm≤d9≤0.43mm。
7. the imaging optical lens assembly according to claim 1, wherein the sixth lens element has a concave object-side surface and a convex image-side surface;
the focal length of the imaging optical lens is f, the focal length of the sixth lens is f6, the curvature radius of the object side surface of the sixth lens is R11, the curvature radius of the image side surface of the sixth lens is R12, the on-axis thickness of the sixth lens is d11, and the following relations are satisfied:
0.81≤f6/f≤28.84；
1.03≤(R11+R12)/(R11-R12)≤38.31；
0.09mm≤d11≤0.26mm。
8. the imaging optical lens of claim 1, wherein the seventh lens element has a concave object-side surface and a concave image-side surface;
the focal length of the image pickup optical lens is f, the focal length of the seventh lens is f7, the on-axis thickness of the seventh lens is d13, and the following relational expression is satisfied:
-1.55≤f7/f≤-0.45；
0.15mm≤d13≤0.58mm。
9. a camera optical lens according to claim 1, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 5.12 mm.
10. A camera optical lens according to claim 1, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.06.
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| CN201711151245.4A CN108051902B (en) | 2017-11-18 | 2017-11-18 | Image pickup optical lens |
| JP2017251257A JP6362200B1 (en) | 2017-11-18 | 2017-12-27 | Imaging optical lens |
| US15/860,273 US10488623B2 (en) | 2017-11-18 | 2018-01-02 | Camera optical lens |
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