CN111077641B - Image pickup optical lens - Google Patents

Image pickup optical lens Download PDF

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CN111077641B
CN111077641B CN201911229604.2A CN201911229604A CN111077641B CN 111077641 B CN111077641 B CN 111077641B CN 201911229604 A CN201911229604 A CN 201911229604A CN 111077641 B CN111077641 B CN 111077641B
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lens
image
lens element
curvature
radius
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CN111077641A (en
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石荣宝
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Chengrui Optics Changzhou Co Ltd
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Chengrui Optics Changzhou Co Ltd
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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
    • 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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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  • Optics & Photonics (AREA)
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Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises the following components from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a seventh lens element with positive refractive power, and an eighth lens element with negative refractive power; and satisfies the following relationships: f1/f is more than or equal to 1.00 and less than or equal to 1.50; d13/d12 is more than or equal to 2.50 and less than or equal to 5.00; f3/f is more than or equal to 1.00 and less than or equal to 2.00; d5/d4 is more than or equal to 4.50 and less than or equal to 7.00. The camera optical lens provided by the invention has good optical performance, and meets the design requirements of large aperture, wide angle and ultra-thinness.

Description

Image pickup optical lens
[ technical field ] A method for producing a semiconductor device
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 of the invention ]
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) Device, and due to the refinement of Semiconductor manufacturing technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed in a form of being excellent in function, light, thin, short and small, 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 three-piece, four-piece, five-piece, or even six-piece and seven-piece lens structures. However, with the development of technology and the increasing demand of diversified users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system for the imaging quality is continuously improved, an eight-piece lens structure gradually appears in the lens design, although a common eight-piece lens has good optical performance, the focal power, the lens pitch and the lens shape setting still have certain irrationality, so that the design requirements of large aperture, ultra-thinning and wide-angle cannot be met while the lens structure has good optical performance.
[ summary of the invention ]
In view of the above problems, an object of the present invention is to provide an imaging optical lens that has good optical performance and satisfies design requirements for a large aperture, ultra-thin thickness, and wide angle.
To solve the above-mentioned problems, the present invention provides an imaging optical lens, in order from an object side to an image side, comprising: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a seventh lens element with positive refractive power, and an eighth lens element with negative refractive power;
the focal length of the first lens is f1, the focal length of the image pickup optical lens is f, the on-axis thickness of the seventh lens is d13, the on-axis distance from the image-side surface of the sixth lens to the object-side surface of the seventh lens is d12, the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, and the on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, so that the following relations are satisfied:
1.00≤f1/f≤1.50；
2.50≤d13/d12≤5.00；
1.00≤f3/f≤2.00；
4.50≤d5/d4≤7.00。
preferably, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, and the following relationship is satisfied:
3.00≤(R3+R4)/(R3-R4)≤10.00。
preferably, the curvature radius of the object-side surface of the first lens element is R1, the curvature radius of the image-side surface of the first lens element is R2, the on-axis thickness of the first lens element is d1, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship:
-5.31≤(R1+R2)/(R1-R2)≤-1.56；0.05≤d1/TTL≤0.15。
preferably, the focal length of the second lens is f2, the on-axis thickness of the second lens is d3, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied:
-6.69≤f2/f≤-1.83；0.01≤d3/TTL≤0.04。
preferably, the curvature radius of the object-side surface of the third lens element is R5, the curvature radius of the image-side surface of the third lens element is R6, and the total optical length of the imaging optical lens system is TTL and satisfies the following relational expression:
-0.79≤(R5+R6)/(R5-R6)≤-0.23；0.03≤d5/TTL≤0.10。
preferably, the focal length of the fourth lens element is f4, the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied:
1.07≤f4/f≤4.03；
1.22≤(R7+R8)/(R7-R8)≤4.35；
0.02≤d7/TTL≤0.06。
preferably, the focal length of the fifth lens element is f5, the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, the total optical length of the imaging optical lens assembly is TTL, and the following relationships are satisfied:
-2.68≤f5/f≤-0.82；
-0.66≤(R9+R10)/(R9-R10)≤-0.19；
0.01≤d9/TTL≤0.03。
preferably, the focal length of the sixth lens element is f6, the radius of curvature of the object-side surface of the sixth lens element is R11, the radius of curvature of the image-side surface of the sixth lens element is R12, the on-axis thickness of the sixth lens element is d11, and the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied:
2.00≤f6/f≤6.14；
1.60≤(R11+R12)/(R11-R12)≤5.70；
0.04≤d11/TTL≤0.13。
preferably, the focal length of the seventh lens element is f7, the radius of curvature of the object-side surface of the seventh lens element is R13, the radius of curvature of the image-side surface of the seventh lens element is R14, and the total optical length of the imaging optical lens system is TTL, which satisfies the following relationship:
3.58≤f7/f≤14.59；
-57.91≤(R13+R14)/(R13-R14)≤-10.50；
0.07≤d13/TTL≤0.22。
preferably, the focal length of the eighth lens element is f8, the radius of curvature of the object-side surface of the eighth lens element is R15, the radius of curvature of the image-side surface of the eighth lens element is R16, the on-axis thickness of the eighth lens element is d15, and the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied:
-2.26≤f8/f≤-0.70；
0.71≤(R15+R16)/(R15-R16)≤2.34；
0.06≤d15/TTL≤0.17。
the invention has the advantages that the camera optical lens has good optical performance, has the characteristics of large aperture, wide angle and ultra-thin, 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.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment;
fig. 2 is a schematic view of axial aberrations of the image-taking optical lens shown in 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 shown in FIG. 1;
fig. 5 is a schematic configuration diagram of an imaging optical lens according to a second embodiment;
fig. 6 is a schematic view of axial aberrations of the image pickup optical lens shown in 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 shown in FIG. 5;
fig. 9 is a schematic configuration diagram of an imaging optical lens according to a third embodiment;
fig. 10 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 9;
fig. 11 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 9;
fig. 12 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 9.
[ detailed description ] embodiments
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 imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes eight lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: the stop S1, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power. An optical element such as an optical filter (filter) GF may be disposed between the eighth lens L8 and the image plane Si.
In the present embodiment, the focal length of the first lens L1 is defined as f1, and the focal length of the imaging optical lens 10 is defined as f, and the following relational expression is satisfied: f1/f is more than or equal to 1.00 and less than or equal to 1.50, the ratio of the focal length f1 of the first lens L1 to the focal length f of the image pickup optical lens 10 is specified, and the optical system performance is improved within the conditional expression range. Preferably, 1.10. ltoreq. f 1/f. ltoreq.1.39.
The on-axis thickness of the seventh lens L7 is d13, and the on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7 is d12, which satisfy the following relationship: 2.50 < d13/d12 < 5.00, and the ratio of the on-axis thickness d13 of the seventh lens L7 to the on-axis distance d12 from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7 is defined, which contributes to the processing of the lens and the assembly of the lens barrel within the conditional expression. Preferably, 2.78. ltoreq. d13/d 12. ltoreq.4.32.
The focal length of the third lens is f3, and the following relation is satisfied: f3/f is more than or equal to 1.00 and less than or equal to 2.00, the ratio of the focal length f3 of the third lens L3 to the focal length f of the shooting optical lens 10 is specified, and the focal power of the third lens L3 can be effectively distributed within the conditional expression range to correct the aberration of the optical system, so that the imaging quality is improved. Preferably, 1.21. ltoreq. f 3/f. ltoreq.1.85 is satisfied.
The on-axis thickness of the third lens L3 is d5, the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 is d4, and the following relation is satisfied: 4.50 < d5/d4 < 7.00, the ratio of the on-axis thickness d5 of the third lens L3 to the on-axis distance d4 from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 is defined, and the overall length of the compression system is favorably shortened within the conditional expression range. Preferably, it satisfies 4.51. ltoreq. d5/d 4. ltoreq.6.75.
The curvature radius of the object side surface of the second lens L2 is defined as R3, the curvature radius of the image side surface of the second lens L2 is defined as R4, and the following relational expressions are satisfied: 3.00 ≦ (R3+ R4)/(R3-R4) ≦ 10.00, and defines the shape of the second lens L2, within the range defined by the conditional expression, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, 3.75. ltoreq. (R3+ R4)/(R3-R4) 8.75 is satisfied.
The curvature radius of the object side surface of the first lens L1 is defined as R1, the curvature radius of the image side surface of the first lens L1 is defined as R2, and the following relational expressions are satisfied: -5.31 ≦ (R1+ R2)/(R1-R2) ≦ -1.56, the shape of the first lens L1 is specified, and the shape of the first lens L1 is reasonably controlled within the conditional expression range so that the first lens L1 can effectively correct the system spherical aberration. Preferably, it satisfies-3.32 ≦ (R1+ R2)/(R1-R2) ≦ -1.95.
The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d1/TTL is more than or equal to 0.05 and less than or equal to 0.15, and ultra-thinning is facilitated in the condition formula range. Preferably, 0.07. ltoreq. d 1/TTL. ltoreq.0.12 is satisfied.
Defining the focal length of the second lens L2 as f2, the following relation is satisfied: f2/f 1.83, the ratio of the focal length f2 of the second lens to the focal length f of the image pickup optical lens 10 is defined, and within the conditional expression, it is advantageous to correct the aberration of the optical system by controlling the negative power of the second lens L2 within a reasonable range. Preferably, it satisfies-4.18. ltoreq. f 2/f. ltoreq-2.29.
The on-axis thickness of the second lens L2 is d3, and the following relation is satisfied: d3/TTL is more than or equal to 0.01 and less than or equal to 0.04, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.02. ltoreq. d 3/TTL. ltoreq.0.03 is satisfied.
The curvature radius of the object side surface of the third lens L3 is defined as R5, the curvature radius of the image side surface of the third lens L3 is defined as R6, and the following relational expressions are satisfied: -0.79 ≦ (R5+ R6)/(R5-R6) ≦ -0.23, and within the range of the conditional expressions, the shape of the third lens L3 can be effectively controlled, which is beneficial to molding the third lens L3 and avoids molding failure and stress generation caused by excessive surface curvature of the third lens L3. Preferably, it satisfies-0.49 ≦ (R5+ R6)/(R5-R6) ≦ -0.28.
The third lens L3 has an on-axis thickness d5, and satisfies the following relation: d5/TTL is more than or equal to 0.03 and less than or equal to 0.10, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.05. ltoreq. d 5/TTL. ltoreq.0.08 is satisfied.
Defining the focal length of the fourth lens L4 as f4, the following relation is satisfied: f4/f is more than or equal to 1.07 and less than or equal to 4.03, the ratio of the focal length f4 of the fourth lens L4 to the focal length f of the image pickup optical lens 10 is regulated, and in the conditional expression range, through reasonable distribution of focal power, the system has better imaging quality and lower sensitivity, and is beneficial to improving the performance of the optical system. Preferably, 1.71. ltoreq. f 4/f. ltoreq.3.23.
The curvature radius of the object side surface of the fourth lens L4 is R7, the curvature radius of the image side surface of the fourth lens L4 is R8, and the following relation 1.22 ≦ (R7+ R8)/(R7-R8) ≦ 4.35 is satisfied. The shape of the fourth lens L4 is defined, and it is advantageous to correct the problem of aberration of the off-axis view angle and the like as the thickness becomes thinner and the angle becomes wider within the conditional expression. Preferably, 1.95. ltoreq. (R7+ R8)/(R7-R8). ltoreq.3.48 is satisfied.
The on-axis thickness of the fourth lens L4 is d7, and the following relation is satisfied: d7/TTL is more than or equal to 0.02 and less than or equal to 0.06, and ultra-thinning is facilitated in the conditional expression range. Preferably, 0.03. ltoreq. d 7/TTL. ltoreq.0.05 is satisfied.
Defining the focal length of the fifth lens L5 as f5, the following relation is satisfied: f5/f is less than or equal to-0.82, the ratio of the focal length f5 of the fifth lens L5 to the focal length f of the image pickup optical lens 10 is specified, and the definition of the fifth lens L5 is effective to make the light angle of the image pickup optical lens 10 gentle and reduce the tolerance sensitivity within the conditional expression range. Preferably, it satisfies-1.68. ltoreq. f 5/f. ltoreq-1.03.
The curvature radius of the object side surface of the fifth lens L5 is R9, the curvature radius of the image side surface of the fifth lens L5 is R10, and the following relational expression is satisfied: -0.66 ≦ (R9+ R10)/(R9-R10) ≦ -0.19, and defines the shape of the fifth lens L5, which is advantageous for correcting the off-axis picture angle aberration and the like as the ultra-thin wide angle progresses in a condition range. Preferably, it satisfies-0.41 ≦ (R9+ R10)/(R9-R10) ≦ -0.23.
The on-axis thickness of the fifth lens L5 is d9, and the following relation is satisfied: d9/TTL is more than or equal to 0.01 and less than or equal to 0.03, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, d9/TTL of 0.016. ltoreq. d 9. ltoreq.0.024 is satisfied.
Defining the focal length of the sixth lens L6 as f6, the following relation is satisfied: f6/f is more than or equal to 2.00 and less than or equal to 6.14, the ratio of the focal length f6 of the sixth lens L6 to the focal length f of the image pickup optical lens 10 is specified, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power within a conditional expression range. Preferably, it satisfies 3.19. ltoreq. f 6/f. ltoreq.4.91.
The curvature radius of the object side surface of the sixth lens L6 is R11, the curvature radius of the image side surface of the sixth lens L6 is R12, and the following relations are satisfied: 1.60 ≤ (R11+ R12)/(R11-R12) ≤ 5.70, and the shape of the sixth lens L6 is regulated, and the aberration of off-axis picture angle can be corrected with the development of ultra-thin wide angle in the condition formula. Preferably, 2.55 ≦ (R11+ R12)/(R11-R12) ≦ 4.56.
The sixth lens L6 has an on-axis thickness d11, and satisfies the following relation: d11/TTL is more than or equal to 0.04 and less than or equal to 0.13, and ultra-thinning is facilitated in the condition formula range. Preferably, 0.06. ltoreq. d 11/TTL. ltoreq.0.10 is satisfied.
Defining the focal length of the seventh lens L7 as f7, the following relation is satisfied: f7/f 14.59 is more than or equal to 3.58, the ratio of the focal length f7 of the seventh lens L7 to the focal length f of the image pickup optical lens 10 is regulated, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power within the conditional expression range. Preferably, it satisfies 5.73. ltoreq. f 7/f. ltoreq.11.67.
The curvature radius of the object side surface of the seventh lens L7 is R13, the curvature radius of the image side surface of the seventh lens L7 is R14, and the following relations are satisfied: the ratio of (R13+ R14)/(R13-R14) is less than or equal to-57.91 and less than or equal to-10.50. The shape of the seventh lens L7 is specified, and it is advantageous to correct problems such as off-axis aberration with the progress of an extremely thin and wide angle within the conditional expression. Preferably, it satisfies-36.19 ≦ (R13+ R14)/(R13-R14) ≦ -13.12.
The on-axis thickness of the seventh lens L7 is d13, and the following relation is satisfied: d13/TTL is more than or equal to 0.07 and less than or equal to 0.22, and ultra-thinning is facilitated in the conditional expression range. Preferably, 0.12. ltoreq. d 13/TTL. ltoreq.0.18 is satisfied.
Defining a focal length f8 of the eighth lens L8, satisfying the following relationship: f8/f is less than or equal to-0.70, the ratio of the focal length f8 of the eighth lens L8 to the focal length f of the image pickup optical lens 10 is specified, and the system has better imaging quality and lower sensitivity through reasonable distribution of the optical power within the conditional expression range. Preferably, it satisfies-1.41. ltoreq. f 8/f. ltoreq-0.88.
The curvature radius of the object side surface of the eighth lens L8 is R15, the curvature radius of the image side surface of the eighth lens L8 is R16, and the following relations are satisfied: 0.71-2.34 of (R15+ R16)/(R15-R16). The shape of the eighth lens L8 is specified, and is advantageous for correcting problems such as off-axis aberration and the like as the angle of view becomes thinner and wider within the range of the conditional expression. Preferably, 1.14. ltoreq. (R15+ R16)/(R15-R16). ltoreq.1.87 is satisfied.
The eighth lens L8 has an on-axis thickness d15, and satisfies the following relation: d15/TTL is more than or equal to 0.06 and less than or equal to 0.17, and ultra-thinning is facilitated in the conditional expression range. Preferably, 0.09. ltoreq. d 15/TTL. ltoreq.0.14 is satisfied.
Further, the total optical length of the image pickup optical lens 10 is defined as TTL, the image height of the image pickup optical lens 10 is IH, and the following relation is satisfied: TTL/IH is less than or equal to 1.45, and ultra-thinning is facilitated.
The field angle of the imaging optical lens 10 is defined as FOV, and the following relation is satisfied: the FOV is more than or equal to 78.00 degrees, which is beneficial to realizing wide angle.
The aperture of the image pickup optical lens 10 is defined as Fno, and the following relationship is satisfied: fno is less than or equal to 1.92, which is beneficial to realizing large aperture and ensures good imaging performance.
That is, when the above relationship is satisfied, the imaging optical lens 10 can satisfy the design requirements of a large aperture, a wide angle of view, and an ultra-thin film while having a good optical imaging performance; in accordance with the characteristics of the imaging optical lens 10, the imaging optical lens 10 is particularly suitable for a mobile phone imaging lens module and a WEB imaging lens which are configured by an imaging element such as a high-pixel CCD or a CMOS.
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. The unit of focal length, on-axis distance, curvature radius, on-axis thickness, position of reverse curvature and position of stagnation point is mm.
TTL (total optical length) (on-axis distance from the object side surface of the first lens L1 to the image plane Si) in mm;
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.
Tables 1 and 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 1 ]
Figure BDA0002303171670000071
Figure BDA0002303171670000081
Wherein each symbol has the following meaning.
S1: an aperture;
r: the radius of curvature of the optical surface and the radius of curvature of the lens as the center;
r1: the radius of curvature of the object-side surface of the first lens L1;
r2: the radius of curvature of the image-side surface of the first lens L1;
r3: the radius of curvature of the object-side surface of the second lens L2;
r4: the radius of curvature of the image-side surface of the second lens L2;
r5: the radius of curvature of the object-side surface of the third lens L3;
r6: the radius of curvature of the image-side surface of the third lens L3;
r7: the radius of curvature of the object-side surface of the fourth lens L4;
r8: the radius of curvature of the image-side surface of the fourth lens L4;
r9: a radius of curvature of the object side surface of the fifth lens L5;
r10: a radius of curvature of the image-side surface of the fifth lens L5;
r11: a radius of curvature of the object side surface of the sixth lens L6;
r12: a radius of curvature of the image-side surface of the sixth lens L6;
r13: a radius of curvature of the object side surface of the seventh lens L7;
r14: a radius of curvature of the image-side surface of the seventh lens L7;
r15: a radius of curvature of the object side surface of the eighth lens L8;
r16: a radius of curvature of the image-side surface of the eighth lens L8;
r17: radius of curvature of the object side of the optical filter GF;
r18: the radius of curvature of the image-side surface of the optical filter GF;
d: an on-axis thickness of the lenses and an 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;
d 1: the on-axis thickness of the first lens L1;
d 2: the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;
d 3: the on-axis thickness of the second lens L2;
d 4: the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;
d 5: 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: an on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;
d 15: the on-axis thickness of the eighth lens L8;
d 16: the on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;
d 17: on-axis thickness of the optical filter GF;
d 18: the on-axis distance from the image side surface of the optical filter GF to the image surface;
nd: the refractive index of the d-line;
nd 1: the refractive index of the d-line of the first lens L1;
nd 2: the refractive index of the d-line of the second lens L2;
nd 3: the refractive index of the d-line of the third lens L3;
nd 4: the refractive index of the d-line of the fourth lens L4;
nd 5: the refractive index of the 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;
nd 8: the refractive index of the d-line of the eighth lens L8;
ndg: the refractive index of the d-line of the optical filter GF;
v d: an 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;
v 8: abbe number of the eighth lens L8;
v g: 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 ]
Figure BDA0002303171670000101
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14 and A16 are aspheric coefficients.
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 P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8, 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 ]
Number of points of inflection Position of reverse curvature 1 Position of reverse curvature 2
P1R1 0 0 0
P1R2 0 0 0
P2R1 2 0.915 2.415
P2R2 2 1.145 2.465
P3R1 1 1.335 0
P3R2 0 0 0
P4R1 1 1.895 0
P4R2 0 0 0
P5R1 0 0 0
P5R2 2 0.395 2.315
P6R1 0 0 0
P6R2 0 0 0
P7R1 2 1.005 3.585
P7R2 1 1.455 0
P8R1 2 0.495 4.045
P8R2 2 1.285 6.365
[ TABLE 4 ]
Figure BDA0002303171670000111
Figure BDA0002303171670000121
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm, respectively, after 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 555nm 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 13 shown later shows values corresponding to the parameters defined in the conditional expressions, for each of the numerical values in the first, second, third, and fourth embodiments.
As shown in table 13, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter of 5.010mm, a full field image height of 8.000mm, and a diagonal field angle of 78.96 °, so that the imaging optical lens 10 has a wide angle, an ultra-thin, and a large aperture, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
(second embodiment)
The second embodiment is basically the same as the first embodiment, and the reference numerals are the same as those in the first embodiment, and the configuration of the image pickup optical lens 20 of the second embodiment is shown in fig. 5, and only the differences 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 ]
Figure BDA0002303171670000122
Figure BDA0002303171670000131
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 ]
Figure BDA0002303171670000132
Figure BDA0002303171670000141
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
P1R1 0 0 0
P1R2 0 0 0
P2R1 2 0.945 2.425
P2R2 1 1.145 2.465
P3R1 1 1.325 0
P3R2 0 0 0
P4R1 2 1.915 2.425
P4R2 0 0 0
P5R1 0 0 0
P5R2 2 0.405 2.305
P6R1 0 0 0
P6R2 0 0 0
P7R1 1 1.015 0
P7R2 1 1.455 0
P8R1 2 0.505 4.015
P8R2 2 1.285 6.355
[ TABLE 8 ]
Figure BDA0002303171670000142
Figure BDA0002303171670000151
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm, respectively, after 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 555nm after passing through the imaging optical lens 20 according to the second embodiment.
Table 13 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment, in accordance with the conditional expressions described above. Obviously, the imaging optical lens of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens 20 has an entrance pupil diameter of 5.000mm, a full field image height of 8.000mm, and a diagonal field angle of 79.10 °, so that the on-axis and off-axis chromatic aberration thereof is sufficiently corrected and the imaging optical lens has excellent optical characteristics, with a wide angle, an ultra-thin, and a large aperture.
(third embodiment)
The third embodiment is basically the same as the first embodiment, and the reference numerals are the same as those in the first embodiment, and the configuration of the imaging optical lens 30 of the third embodiment is shown in fig. 9, and only the differences will be described below.
Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
Figure BDA0002303171670000152
Figure BDA0002303171670000161
Table 10 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 10 ]
Figure BDA0002303171670000162
Tables 11 and 12 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 11 ]
Number of points of inflection Position of reverse curvature 1 Position of reverse curvature 2
P1R1 0 0 0
P1R2 0 0 0
P2R1 2 0.825 2.455
P2R2 2 1.085 2.485
P3R1 1 1.165 0
P3R2 0 0 0
P4R1 2 2.005 2.475
P4R2 0 0 0
P5R1 0 0 0
P5R2 2 0.435 2.315
P6R1 0 0 0
P6R2 0 0 0
P7R1 1 1.045 0
P7R2 1 1.515 0
P8R1 2 0.475 4.025
P8R2 2 1.315 6.365
[ TABLE 12 ]
Figure BDA0002303171670000171
Figure BDA0002303171670000181
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm, respectively, after passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 30 according to the third embodiment.
Table 13 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment, in accordance with the conditional expressions described above. Obviously, the imaging optical lens of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.999mm, a full field image height of 8.000mm, and a diagonal field angle of 79.28 °, so that the imaging optical lens 30 has a wide angle, an ultra-thin, and a large aperture, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
[ TABLE 13 ]
Parameter and condition formula Embodiment mode 1 Embodiment mode 2 Embodiment 3
f 9.520 9.502 9.499
f1 12.000 12.176 11.365
f2 -26.180 -31.794 -27.367
f3 13.392 14.128 16.149
f4 25.597 21.975 20.339
f5 -12.760 -11.756 -12.089
f6 38.940 37.923 38.087
f7 82.709 92.405 68.040
f8 -10.770 -10.735 -10.000
f1/f 1.26 1.28 1.20
d13/d12 3.63 3.06 3.13
f3/f 1.41 1.49 1.70
d5/d4 5.56 4.51 6.50
Fno 1.90 1.90 1.90
Where Fno is the aperture of the imaging optical lens.
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, comprising eight lens elements in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a seventh lens element with positive refractive power, and an eighth lens element with negative refractive power;
the focal length of the first lens is f1, the focal length of the image pickup optical lens is f, the focal length of the fourth lens is f4, the on-axis thickness of the seventh lens is d13, the on-axis distance from the image side surface of the sixth lens to the object side surface of the seventh lens is d12, the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, and the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, so that the following relations are satisfied:
1.00≤f1/f≤1.50；
1.07≤f4/f≤4.03；
2.50≤d13/d12≤5.00；
1.00≤f3/f≤2.00；
4.50≤d5/d4≤7.00。
2. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, and the following relationship is satisfied:
3.00≤(R3+R4)/(R3-R4)≤10.00。
3. the image-capturing optical lens unit according to claim 1, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, the on-axis thickness of the first lens element is d1, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:
-5.31≤(R1+R2)/(R1-R2)≤-1.56；
0.05≤d1/TTL≤0.15。
4. the image-capturing optical lens of claim 1, wherein the second lens has a focal length f2, an on-axis thickness d3, and an optical total length TTL that satisfies the following relationship:
-6.69≤f2/f≤-1.83；
0.01≤d3/TTL≤0.04。
5. the imaging optical lens of claim 1, wherein a radius of curvature of an object-side surface of the third lens element is R5, a radius of curvature of an image-side surface of the third lens element is R6, and an optical total length of the imaging optical lens is TTL and satisfies the following relationship:
-0.79≤(R5+R6)/(R5-R6)≤-0.23；
0.03≤d5/TTL≤0.10。
6. the image-capturing optical lens unit according to claim 1, wherein the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:
1.22≤(R7+R8)/(R7-R8)≤4.35；
0.02≤d7/TTL≤0.06。
7. the image-capturing optical lens unit according to claim 1, wherein the fifth lens element has a focal length f5, a radius of curvature of an object-side surface of the fifth lens element is R9, a radius of curvature of an image-side surface of the fifth lens element is R10, an on-axis thickness of the fifth lens element is d9, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-2.68≤f5/f≤-0.82；
-0.66≤(R9+R10)/(R9-R10)≤-0.19；
0.01≤d9/TTL≤0.03。
8. the image-capturing optical lens unit according to claim 1, wherein the sixth lens element has a focal length f6, a radius of curvature of an object-side surface of the sixth lens element is R11, a radius of curvature of an image-side surface of the sixth lens element is R12, an on-axis thickness of the sixth lens element is d11, and an optical total length TTL satisfies the following relationship:
2.00≤f6/f≤6.14；
1.60≤(R11+R12)/(R11-R12)≤5.70；
0.04≤d11/TTL≤0.13。
9. the image-capturing optical lens unit according to claim 1, wherein the seventh lens element has a focal length f7, a radius of curvature of the object-side surface of the seventh lens element is R13, a radius of curvature of the image-side surface of the seventh lens element is R14, and the image-capturing optical lens unit has a total optical length TTL that satisfies the following relationship:
3.58≤f7/f≤14.59；
-57.91≤(R13+R14)/(R13-R14)≤-10.50；
0.07≤d13/TTL≤0.22。
10. the image-capturing optical lens unit according to claim 1, wherein the eighth lens element has a focal length f8, a radius of curvature of an object-side surface of the eighth lens element is R15, a radius of curvature of an image-side surface of the eighth lens element is R16, an on-axis thickness of the eighth lens element is d15, and an optical total length TTL satisfies the following relationship:
-2.26≤f8/f≤-0.70；
0.71≤(R15+R16)/(R15-R16)≤2.34；
0.06≤d15/TTL≤0.17。
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