CN111007637B - Image pickup optical lens - Google Patents

Image pickup optical lens Download PDF

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Publication number
CN111007637B
CN111007637B CN201911343164.3A CN201911343164A CN111007637B CN 111007637 B CN111007637 B CN 111007637B CN 201911343164 A CN201911343164 A CN 201911343164A CN 111007637 B CN111007637 B CN 111007637B
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lens
image
curvature
ttl
radius
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CN111007637A (en
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孙雯
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Chengrui Optics Changzhou Co Ltd
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Chengrui Optics Changzhou Co Ltd
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045Miniaturised 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
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/18Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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, a seventh lens, and an eighth lens; and satisfies the following relationships: f1/f is more than or equal to 0.6 and less than or equal to 1.7; f2 is less than or equal to 0 mm; -10 ≤ (R15+ R16)/(R15-R16) is ≤ 1.2; d13/d14 is more than or equal to 0.5 and less than or equal to 1.5. The camera optical lens has good optical performance such as large aperture, ultrathin property and the like.

Description

Image pickup optical lens
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) 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 with a good function, a light weight, a small size, and a light weight, and thus, 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, the eight-piece lens structure gradually appears in the design of the lens. It is urgently required to provide a large-aperture, ultra-thin optical imaging lens having good optical performance.
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 a large aperture and an ultra-thin profile 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, a seventh lens, and an eighth 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 second lens is f2, the curvature radius of the object side surface of the eighth lens is R15, the curvature radius of the image side surface of the eighth lens is R16, the on-axis thickness of the seventh lens is d13, and the on-axis distance from the image side surface of the seventh lens to the object side surface of the eighth lens is d14, so that the following relational expression is satisfied:
0.6≤f1/f≤1.7;
f2≤0mm;
-10≤(R15+R16)/(R15-R16)≤-1.2;
0.5≤d13/d14≤1.5。
preferably, the eighth lens has a focal length f8 and satisfies the following relationship:
-22≤f8/f≤-0.8。
preferably, a curvature radius of an object-side surface of the first lens is R1, a curvature radius of an image-side surface of the first lens is R2, and an on-axis thickness of the first lens is d1, an optical total length of the imaging optical lens is TTL, and the following relational expression is satisfied:
-11.03≤(R1+R2)/(R1-R2)≤-0.71;
0.04≤d1/TTL≤0.19。
preferably, the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, and the on-axis thickness of the second lens element is d3, the total optical length of the imaging optical lens system is TTL, and the following relationship is satisfied:
-3.80≤f2/f≤-0.77;
0.69≤(R3+R4)/(R3-R4)≤8.95;
0.02≤d3/TTL≤0.05。
preferably, the focal length of the third lens is f3, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, and the on-axis thickness of the third lens is d5, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied:
0.47≤f3/f≤7.79;
-5.76≤(R5+R6)/(R5-R6)≤-0.98;
0.03≤d5/TTL≤0.16。
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, and 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:
-74.25≤f4/f≤224.73;
0.28≤(R7+R8)/(R7-R8)≤8.87;
0.02≤d7/TTL≤0.07。
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, and the on-axis thickness of the fifth lens element is d9, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied:
-43.50≤f5/f≤50.58;
-21.37≤(R9+R10)/(R9-R10)≤2.47;
0.02≤d9/TTL≤0.06。
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, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied:
-187.55≤f6/f≤7.97;
-33.43≤(R11+R12)/(R11-R12)≤1.67;
0.03≤d11/TTL≤0.15。
preferably, the focal length of the seventh lens element is f7, the on-axis radius of curvature of the object-side surface of the seventh lens element is R13, the on-axis 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 and satisfies the following relationship:
-2.21≤f7/f≤11.89;
-37.40≤(R13+R14)/(R13-R14)≤3.34;
0.03≤d13/TTL≤0.16。
preferably, the on-axis thickness of the eighth lens element is d15, the total optical length of the image pickup optical lens is TTL, and the following relationship is satisfied:
0.03≤d15/TTL≤0.12。
the invention has the beneficial effects that: the pick-up optical lens according to the present invention has excellent optical characteristics, satisfies the requirements of large aperture and ultra-thin, and is particularly suitable for a mobile phone pick-up lens assembly and a WEB pick-up lens which are composed of pick-up elements such as a high-pixel CCD and a CMOS.
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;
fig. 9 is a schematic configuration diagram of an imaging optical lens according to a third embodiment of the present invention;
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.
Fig. 13 is a schematic configuration diagram of an imaging optical lens according to a fourth embodiment of the present invention;
fig. 14 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 13;
fig. 15 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 13;
fig. 16 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 13.
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 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 L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8. An optical element such as an optical filter (filter) GF may be disposed between the eighth lens L8 and the image plane Si.
Defining the focal length f of the entire image pickup optical lens 10 and the focal length f1 of the first lens L1, the following relations are satisfied: f1/f is more than or equal to 0.6 and less than or equal to 1.7, the ratio of the focal length of the first lens to the total focal length is specified in the condition formula specified range, and the system total length is favorably reduced in the condition range. Preferably, 0.61. ltoreq. f 1/f. ltoreq.1.69 is satisfied.
Defining the focal length of the second lens L2 as f2, the following relation is satisfied: f2 is less than or equal to 0, and the focal length of the second lens is regulated, so that the aberration correction of the system is facilitated, and the imaging quality is improved.
The radius of curvature of the object side surface of the eighth lens L8 is R15, the radius of curvature of the image side surface of the eighth lens L8 is R16, -10 ≦ (R15+ R16)/(R15-R16) ≦ -1.2, and the shape of the eighth lens is defined to help reduce the degree of beam deflection and reduce aberration. Preferably, it satisfies-9.90 ≦ (R15+ R16)/(R15-R16) ≦ -1.22.
Defining an on-axis thickness of the seventh lens L7 as d13, an on-axis distance from an image-side surface of the seventh lens L7 to an object-side surface of the eighth lens L8 as d14, the following relationship is satisfied: d13/d14 is more than or equal to 0.5 and less than or equal to 1.5, the ratio of the thickness of the seventh lens to the air space of the seventh eighth lens is specified, and lens processing and lens assembly are facilitated within the conditional range. Satisfies d13/d14 of 0.52-1.49.
The focal length of the eighth lens L8 is f8, and the series relation is satisfied: f8/f is more than or equal to-22 and less than or equal to-0.8, the ratio of the focal length of the eighth lens to the total focal length is specified, the aberration correction is facilitated within the condition range, and the image quality of the image plane is improved. Preferably, it satisfies-20.72. ltoreq. f 8/f. ltoreq-0.81.
When the focal length of the image pickup optical lens 10, the focal length of each lens, the on-axis distance from the image side surface to the object side surface of the relevant lens, and the on-axis thickness satisfy the above relation, the image pickup optical lens 10 can have high performance, and meet the design requirements of large aperture, wide angle, and ultra-thin.
The curvature radius of the object side surface of the first lens L1 is R1, the curvature radius of the image side surface of the first lens L1 is R2, -11.03 (R1+ R2)/(R1-R2) is less than or equal to-0.71, the shape of the first lens L1 is defined, and when the conditional expression specifies the range, the shape of the first lens L1 is favorably and reasonably controlled, so that the first lens L1 can effectively correct the system spherical aberration. Preferably, it satisfies-6.89 ≦ (R1+ R2)/(R1-R2). ltoreq.0.89.
The on-axis thickness of the first lens L1 is d1, the total optical length of the shooting optical lens is TTL, and the following relational expression is satisfied: d1/TTL is more than or equal to 0.04 and less than or equal to 0.19, and ultra-thinning is favorably realized within the range specified by the conditional expression. Preferably, 0.06. ltoreq. d 1/TTL. ltoreq.0.15 is satisfied.
The focal length of the second lens L2 is f2, and the series relation is satisfied: 3.80 f2/f 0.77, and the aberration of the optical system is corrected by controlling the negative power of the second lens L2 in a reasonable range. Preferably, it satisfies-2.38. ltoreq. f 2/f. ltoreq-0.97.
The curvature radius of the object side surface of the second lens L2 is R3, the curvature radius of the image side surface of the second lens L2 is R4, the curvature radius of 0.69 (R3+ R4)/(R3-R4) is less than or equal to 8.95, the shape of the second lens L2 is defined, and the chromatic aberration of the axis can be corrected favorably as the lens is changed to an ultra-thin wide angle within the range. Preferably, 1.10. ltoreq. (R3+ R4)/(R3-R4). ltoreq.7.16 is satisfied.
The on-axis thickness of the second lens L2 is d3, the total optical length of the shooting optical lens is TTL, and the following relational expression is satisfied: d3/TTL is more than or equal to 0.02 and less than or equal to 0.05, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.04 is satisfied.
Defining the focal length f of the entire image pickup optical lens 10 and the focal length f3 of the third lens L3, the following relations are satisfied: 0.47 ≦ f3/f ≦ 7.79, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power within the conditional range. Preferably, 0.75 ≦ f3/f ≦ 6.23.
The curvature radius of the object side surface of the third lens L3 is R5, the curvature radius of the image side surface of the third lens L3 is R6, -5.76 ≦ (R5+ R6)/(R5-R6) ≦ -0.98, the shape of the third lens L3 is defined, the shape of the third lens L3 can be effectively controlled, the third lens L3 is favorably molded, and the deflection degree of light rays passing through the lenses can be alleviated within the range defined by a conditional expression, so that aberration can be effectively reduced. Preferably, it satisfies-3.60 ≦ (R5+ R6)/(R5-R6). ltoreq.1.22.
The on-axis thickness of the third lens L3 is d5, the total optical length of the shooting optical lens is TTL, and the following relational expression is satisfied: d5/TTL is more than or equal to 0.03 and less than or equal to 0.16, and ultra-thinning is favorably realized within the specified range of the conditional expression. Preferably, 0.05. ltoreq. d 5/TTL. ltoreq.0.13 is satisfied.
The focal length of the fourth lens L4 is f4, and the series relation is satisfied: 74.25 ≦ f4/f ≦ 224.73, which specifies the ratio of the focal length of the fourth lens L4 to the overall focal length. When the optical power is within the specified range, the system has better imaging quality and lower sensitivity through reasonable distribution of the optical power. Preferably, it satisfies-46.41. ltoreq. f 4/f. ltoreq. 179.79.
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, the (R7+ R8)/(R7-R8) is not more than 0.28, and the shape of the fourth lens L4 is defined, so that the problem of aberration of off-axis angles and the like can be corrected with the development of ultra-thin and wide-angle angles within the conditional expression range. Preferably, 0.44. ltoreq. (R7+ R8)/(R7-R8). ltoreq.7.09 is satisfied.
The on-axis thickness of the fourth lens L4 is d7, the total optical length of the shooting optical lens is TTL, and the following relational expression is satisfied: d7/TTL is more than or equal to 0.02 and less than or equal to 0.07, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 7/TTL. ltoreq.0.06 is satisfied.
The focal length of the fifth lens L5 is f5, and the series relation is satisfied: 43.50 ≦ f5/f ≦ 50.58, and the ratio of the focal length of the fifth lens to the total focal length of the system is defined within the conditional expression, so that the system has better imaging quality and lower sensitivity through reasonable distribution of the focal lengths. Preferably, f5/f 40.47 is satisfied at-27.18. ltoreq. f 5/f.
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, -21.37 (R9+ R10)/(R9-R10) is 2.47 or less, the shape of the fifth lens L5 is defined, and when the condition is within the range of the conditional expression, the problem of aberration of the off-axis angle and the like can be favorably corrected along with the development of the ultra-thin and wide-angle. Preferably, it satisfies-13.36 ≦ (R9+ R10)/(R9-R10). ltoreq.1.98.
The on-axis thickness of the fifth lens L5 is d9, the total optical length of the shooting optical lens is TTL, and the following relational expression is satisfied: d9/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 9/TTL. ltoreq.0.05 is satisfied.
The focal length of the sixth lens L6 is f6, and the series relation is satisfied: -187.55 ≦ f6/f ≦ 7.97, specifying the ratio of the focal length of the sixth lens L6 to the overall focal length. When the optical power is within the specified range, the system has better imaging quality and lower sensitivity through reasonable distribution of the optical power. Preferably, it satisfies-117.22 ≦ f6/f ≦ 6.38.
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, -33.43 ≦ (R11+ R12)/(R11-R12) ≦ 1.67, and the shape of the sixth lens L6 is defined, so that it is advantageous to correct the problems such as the aberration of the off-axis angle with the development of the ultra-thin and wide-angle in the conditional expression range. Preferably, it satisfies-20.89 ≦ (R11+ R12)/(R11-R12). ltoreq.1.34.
The on-axis thickness of the sixth lens L6 is d11, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d11/TTL is more than or equal to 0.03 and less than or equal to 0.15, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 11/TTL. ltoreq.0.12 is satisfied.
The focal length of the seventh lens L7 is f7, and the series relation is satisfied: 2.21 ≦ f7/f ≦ 11.89, specifying the ratio of the focal length of the seventh lens L7 to the overall focal length. When the optical power is within the specified range, the system has better imaging quality and lower sensitivity through reasonable distribution of the optical power. Preferably, it satisfies-1.38. ltoreq. f 7/f. ltoreq.9.51.
The curvature radius R13 of the object side surface of the seventh lens L7 and the curvature radius R14 of the image side surface of the seventh lens L7 are defined, and the following relations are satisfied: 37.40 ≦ (R13+ R14)/(R13-R14) ≦ 3.34, and the shape of the seventh lens L7 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, it satisfies-23.37 ≦ (R13+ R14)/(R13-R14). ltoreq.2.67.
The on-axis thickness of the seventh lens L7 is d13, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d13/TTL is more than or equal to 0.03 and less than or equal to 0.16, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 13/TTL. ltoreq.0.13 is satisfied.
The on-axis thickness of the eighth lens L8 is d15, the total optical length of the shooting optical lens is TTL, and the following relational expression is satisfied: d15/TTL is more than or equal to 0.03 and less than or equal to 0.12, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 15/TTL. ltoreq.0.09 is satisfied.
In this embodiment, the combined focal length of the first lens L1 and the second lens L2 is defined as f12, and the following relation is satisfied: f12/f is not less than 0.54 and not more than 10.74, and within the range of the conditional expression, the aberration and distortion of the image pickup optical lens 10 can be eliminated, and the back focal length of the image pickup optical lens 10 can be suppressed, so as to keep the miniaturization of the image lens system. Preferably, 0.86. ltoreq. f 12/f. ltoreq.8.59.
In this embodiment, the ratio TTL/IH of the total optical length TTL to the image height of the image pickup optical lens 10 is less than or equal to 1.23, which is beneficial to achieving ultra-thinning.
In the present embodiment, the F-number (Fno) of the imaging optical lens 10 is 1.95 or less. The large aperture is large, and the imaging performance is good.
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. 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: the total optical length (on-axis distance from the object side surface of the first lens L1 to the image plane) in units of 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 BDA0002332054530000101
Figure BDA0002332054530000111
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;
vd: 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;
v8: abbe number of the eighth lens L8;
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 ]
Figure BDA0002332054530000141
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric coefficients.
IH: image height
y=(x2/R)/[1+{1-(k+1)(x2/R2)}1/2]+A4x4+A6x6+A8x8+A10x10+A12x12+A14x14+A16x16+A18x18+A20x20 (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. 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, and P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, respectively. 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 Position of reverse curvature 3
P1R1 1 2.285
P1R2
P2R1
P2R2
P3R1
P3R2
P4R1 1 0.045
P4R2 1 2.175
P5R1 1 2.415
P5R2 3 0.235 0.675 2.455
P6R1 3 0.245 0.905 2.665
P6R2 1 3.715
P7R1 2 0.955 3.125
P7R2 2 1.025 4.295
P8R1 2 3.405 5.945
P8R2 2 5.065 6.185
[ TABLE 4 ]
Figure BDA0002332054530000151
Figure BDA0002332054530000161
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 587nm, 546nm, 486nm, and 436nm passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing the field curvature and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 10 according to the first embodiment, where the field curvature S in fig. 4 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.
Table 17 shown later shows values corresponding to the parameters specified in the conditional expressions for the respective numerical values in examples 1, 2, 3, and 4.
As shown in table 17, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.664mm, a full field image height of 8.00mm, a diagonal field angle of 80.00 °, a large aperture, a wide angle, and a high profile, and has excellent optical characteristics with the 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 ]
Figure BDA0002332054530000162
Figure BDA0002332054530000171
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 BDA0002332054530000172
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 Position of reverse curve 4
P1R1 1 2.315
P1R2
P2R1
P2R2 1 1.935
P3R1
P3R2
P4R1 1 0.235
P4R2 2 0.395 2.085
P5R1 2 0.205 2.365
P5R2 3 0.405 2.195 2.755
P6R1 1 2.365
P6R2 2 2.475 2.845
P7R1 3 0.885 3.145 4.985
P7R2 3 1.015 4.315 5.325
P8R1 4 2.505 3.665 4.835 5.515
P8R2 1 5.565
[ TABLE 8 ]
Number of stagnation points Location of stagnation 1 Location of stagnation 2 Location of stagnation 3
P1R1
P1R2
P2R1
P2R2
P3R1
P3R2
P4R1 1 0.395
P4R2 1 0.685
P5R1 1 0.345
P5R2 1 0.695
P6R1
P6R2
P7R1 3 1.595 4.875 5.055
P7R2 1 1.785
P8R1
P8R2
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 587nm, 546nm, 486nm, and 436nm 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 546nm after passing through the imaging optical lens 20 according to the second embodiment.
As shown in table 17, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.668mm, a full field image height of 8.00mm, a diagonal field angle of 80.00 °, a large aperture, a wide angle, and a high profile, and has excellent optical characteristics with the on-axis and off-axis chromatic aberration sufficiently corrected.
(third embodiment)
The third 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 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
Figure BDA0002332054530000191
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 BDA0002332054530000201
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 Position of reverse curvature 3 Position of reverse curve 4
P1R1 1 2.275
P1R2 1 2.145
P2R1
P2R2
P3R1
P3R2
P4R1 1 0.265
P4R2 2 0.355 2.175
P5R1 2 0.365 2.385
P5R2 2 0.185 2.365
P6R1 2 0.895 2.865
P6R2 1 0.955
P7R1 2 0.515 3.005
P7R2 2 0.925 4.745
P8R1 4 3.595 3.745 5.145 6.285
P8R2 4 1.935 2.775 5.675 6.435
[ TABLE 12 ]
Figure BDA0002332054530000202
Figure BDA0002332054530000211
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 587nm, 546nm, 486nm, and 436nm 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 546nm after passing through the imaging optical lens 30 according to the third embodiment.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.663mm, a full field image height of 8.00mm, a diagonal field angle of 80.00 °, a large aperture, a wide angle, and a high profile, and has excellent optical characteristics with the on-axis and off-axis chromatic aberration sufficiently corrected.
(fourth embodiment)
The fourth embodiment is basically the same as the first embodiment, and the same reference numerals as in the first embodiment, and only different points will be described below.
Tables 13 and 14 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 13 ]
Figure BDA0002332054530000212
Figure BDA0002332054530000221
Table 14 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 14 ]
Figure BDA0002332054530000222
Tables 15 and 16 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 15 ]
Figure BDA0002332054530000231
[ TABLE 16 ]
Number of stagnation points Location of stagnation 1 Location of stagnation 2
P1R1
P1R2
P2R1
P2R2
P3R1
P3R2
P4R1 1 0.475
P4R2 1 0.575
P5R1 1 0.645
P5R2 1 0.535
P6R1 1 1.335
P6R2 1 1.485
P7R1 1 0.625
P7R2 1 1.385
P8R1 2 6.105 6.445
P8R2
Fig. 14 and 15 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 587nm, 546nm, 486nm, and 436nm passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 40 according to the fourth embodiment.
As shown in table 17, the fourth embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.663mm, a full field image height of 8.00mm, a diagonal field angle of 80.00 °, a large aperture, a wide angle, and a high profile, and has excellent optical characteristics with the on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 17 ]
Parameter and condition formula Example 1 Example 2 Example 3 Example 4
f1/f 0.88 0.62 0.92 1.68
(R15+R16)/(R15-R16) -1.24 -1.49 -9.79 -4.72
d13/d14 0.53 0.89 1.48 0.78
f 9.002 9.010 8.999 8.999
f1 7.910 5.576 8.322 15.097
f2 -17.109 -10.472 -16.666 -16.666
f3 24.797 46.771 19.549 8.388
f4 1348.704 -89.465 -161.740 -334.107
f5 -195.771 -59.716 91.326 303.466
f6 -844.166 35.765 47.811 30.308
f7 23.072 71.427 -9.934 -8.282
f8 -7.456 -9.083 -174.923 -83.798
f12 12.500 9.716 13.848 64.419
Fno 1.93 1.93 1.93 1.93
Fno is the F-number of the diaphragm of the image pickup 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 (9)

1. An imaging optical lens, comprising eight lens elements in total, 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, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element with negative refractive power;
the optical lens system comprises a first lens, a second lens, an eighth lens, a seventh lens, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a seventh lens, wherein the focal length of the optical lens system is f1, the focal length of the second lens is f2, the focal length of the eighth lens is f8, the radius of curvature of an object-side surface of the fifth lens is R9, the radius of curvature of an image-side surface of the fifth lens is R10, the radius of curvature of an object-side surface of the eighth lens is R15, the radius of curvature of an image-side surface of the eighth lens is R16, the on-axis thickness of the seventh lens is d13, and the on-axis distance from the image-side surface of the seventh lens to the object-side surface of the eighth lens is d14, and satisfies the following relations:
0.6≤f1/f≤1.7;
f2<0mm;
-22≤f8/f≤-1;
-21.37≤(R9+R10)/(R9-R10)≤1.65;
-10≤(R15+R16)/(R15-R16)≤-1.2;
0.5≤d13/d14≤1.5。
2. the image-capturing optical lens of claim 1, wherein 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, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:
-11.03≤(R1+R2)/(R1-R2)≤-0.71;
0.04≤d1/TTL≤0.19。
3. the image-capturing optical lens of claim 1, wherein the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the image-side surface of the second lens element is R4, and the on-axis thickness of the second lens element is d3, the total optical length of the image-capturing optical lens is TTL, and the following relationships are satisfied:
-3.80≤f2/f≤-0.77;
0.69≤(R3+R4)/(R3-R4)≤8.95;
0.02≤d3/TTL≤0.05。
4. the imaging optical lens of claim 1, wherein the third lens has a focal length of f3, a radius of curvature of an object-side surface of the third lens is R5, a radius of curvature of an image-side surface of the third lens is R6, and an on-axis thickness of the third lens is d5, the imaging optical lens has a total optical length of TTL, and satisfies the following relationship:
0.47≤f3/f≤7.79;
-5.76≤(R5+R6)/(R5-R6)≤-0.98;
0.03≤d5/TTL≤0.16。
5. the image-taking optical lens according to claim 1, wherein the fourth lens has a focal length f4, a radius of curvature of an object-side surface of the fourth lens is R7, a radius of curvature of an image-side surface of the fourth lens is R8, and an on-axis thickness d7, the image-taking optical lens has an optical total length TTL, and satisfies the following relationship:
-74.25≤f4/f≤224.73;
0.28≤(R7+R8)/(R7-R8)≤8.87;
0.02≤d7/TTL≤0.07。
6. the image-capturing optical lens according to claim 1, wherein the focal length of the fifth lens element is f5, and the on-axis thickness of the fifth lens element is d9, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:
-43.50≤f5/f≤50.58;
0.02≤d9/TTL≤0.06。
7. 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, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-187.55≤f6/f≤7.97;
-33.43≤(R11+R12)/(R11-R12)≤1.67;
0.03≤d11/TTL≤0.15。
8. the image-capturing optical lens unit according to claim 1, wherein the seventh lens element has a focal length f7, an on-axis radius of curvature of the object-side surface of the seventh lens element is R13, an on-axis 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 and satisfies the following relationship:
-2.21≤f7/f≤11.89;
-37.40≤(R13+R14)/(R13-R14)≤3.34;
0.03≤d13/TTL≤0.16。
9. a photographic optical lens according to claim 1, characterized in that the on-axis thickness of the eighth lens element is d15, the optical total length of the photographic optical lens is TTL, and the following relation is satisfied:
0.03≤d15/TTL≤0.12。
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