CN111007634B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111007634B CN111007634B CN201911342228.8A CN201911342228A CN111007634B CN 111007634 B CN111007634 B CN 111007634B CN 201911342228 A CN201911342228 A CN 201911342228A CN 111007634 B CN111007634 B CN 111007634B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
- G02B13/18—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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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 0.60 and less than or equal to 1.90; f2 is less than or equal to 0; -1.00 ≤ (R5+ R6)/(R5-R6) ≤ 0.34; d3/d4 is more than or equal to 2.00 and less than or equal to 8.00. The imaging optical lens of the invention has good optical performance such as large aperture, wide angle, ultra-thin and the like.
Description
Technical Field
The present invention relates to the field of optical lenses, and more particularly, to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging apparatuses such as monitors and PC lenses.
Background
In recent years, with the rise of smart phones, the demand of miniaturized camera lenses is increasing, and the photosensitive devices of general camera lenses are not limited to two types, namely, a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) 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 a three-piece or four-piece lens structure. Moreover, with the development of technology and the increase of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system on the imaging quality is continuously improved, five-piece, six-piece, seven-piece and eight-piece lens structures gradually appear in the design of the lens. An ultra-thin wide-angle imaging optical lens having excellent optical characteristics is urgently required.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an imaging optical lens that can satisfy the requirements of ultra-thinning and wide angle while achieving high imaging performance.
To solve the above-mentioned problems, an embodiment of the present invention provides an imaging optical lens, in order from an object side to an image side, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, 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 third lens is R5, the curvature radius of the image-side surface of the third lens is R6, the on-axis thickness of the second lens is d3, 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 relational expression is satisfied:
0.60≤f1/f≤1.90；
f2≤0；
-1.00≤(R5+R6)/(R5-R6)≤-0.34；
2.00≤d3/d4≤8.00。
optionally, the sixth lens has a focal length f6 and satisfies the following relation:
-3.20≤f6/f≤-1.00。
optionally, a curvature radius of an object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, an on-axis thickness of the first lens element is d1, and an optical total length of the image pickup optical lens system is TTL and satisfies the following relation:
-6.56≤(R1+R2)/(R1-R2)≤0.68；
0.03≤d1/TTL≤0.12。
optionally, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, and the total optical length of the image pickup optical lens system is TTL and satisfies the following relation:
-29.34≤f2/f≤-0.32；
-0.49≤(R3+R4)/(R3-R4)≤23.12；
0.02≤d3/TTL≤0.09。
optionally, a focal length of the third lens is f3, an on-axis thickness of the third lens is d5, an optical total length of the image pickup optical lens is TTL, and the following relation is satisfied:
0.47≤f3/f≤3.36；
0.04≤d5/TTL≤0.17。
optionally, a focal length of the fourth lens element is f4, a curvature radius of an object-side surface of the fourth lens element is R7, a curvature radius of an image-side surface of the fourth lens element is R8, an on-axis thickness of the fourth lens element is d7, an optical total length of the image pickup optical lens system is TTL, and the following relationships are satisfied:
-22.97≤f4/f≤96.86；
-8.27≤(R7+R8)/(R7-R8)≤68.91；
0.02≤d7/TTL≤0.07。
optionally, a focal length of the fifth lens element is f5, a curvature radius of an object-side surface of the fifth lens element is R9, a curvature radius 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 pickup optical lens system is TTL, and the following relationships are satisfied:
1.32≤f5/f≤52.78；
0.15≤(R9+R10)/(R9-R10)≤20.26；
0.04≤d9/TTL≤0.21。
optionally, a curvature radius of an object-side surface of the sixth lens element is R11, a curvature radius 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 of the image pickup optical lens system is TTL and satisfies the following relation:
-5.94≤(R11+R12)/(R11-R12)≤-1.06；
0.02≤d11/TTL≤0.17。
optionally, a focal length of the seventh lens element is f7, a curvature radius of an object-side surface of the seventh lens element is R13, a curvature radius of an image-side surface of the seventh lens element is R14, an on-axis thickness of the seventh lens element is d13, an optical total length of the image pickup optical lens system is TTL, and the following relationships are satisfied:
0.38≤f7/f≤2.73；
-10.33≤(R13+R14)/(R13-R14)≤-0.31；
0.03≤d13/TTL≤0.26。
optionally, a focal length of the eighth lens element is f8, a curvature radius of an object-side surface of the eighth lens element is R15, a curvature radius of an image-side surface of the eighth lens element is R16, an on-axis thickness of the eighth lens element is d15, an optical total length of the image pickup optical lens system is TTL, and the following relationships are satisfied:
-2.00≤f8/f≤-0.48；
0.29≤(R15+R16)/(R15-R16)≤3.69；
0.02≤d15/TTL≤0.06。
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, ultra-thinning and wide angle of view, 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 high-pixel CCDs and CMOSs.
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.
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 of the whole shooting optical lens 10 as f, the focal length of the first lens L1 as f1, f1/f is more than or equal to 0.60 and less than or equal to 1.90, and defining the ratio of the focal length of the first lens L1 to the total focal length of the system, the spherical aberration and the curvature of field of the system can be effectively balanced.
The focal length of the second lens L2 is defined as f2, f2 is less than or equal to 0, the focal length of the second lens L2 is defined, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal length. Preferably, f2 is satisfied at-29.00. ltoreq. f 2. ltoreq.0.85.
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, -1.00 ≦ (R5+ R6)/(R5-R6) ≦ -0.34, and the shape of the third lens L3 is defined, so that the deflection degree of light rays passing through the lens can be alleviated within a specified range, and the aberration can be effectively reduced.
The on-axis thickness of the second lens L2 is defined as d3, 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 defined as d4, d3/d4 is defined as not more than 2.00 and not more than 8.00, and the ratio of the thickness of the second lens L2 to the air space of the third lens L3 is defined, so that the total length of an optical system can be compressed in a defined range, and the ultrathin effect is realized. Preferably, 2.03. ltoreq. d3/d 4. ltoreq.7.92 is satisfied.
When the focal length of the image-capturing optical lens 10, the focal lengths of the respective lenses, and the on-axis thickness from the image-side surface to the object-side surface of the relevant lens satisfy the above-mentioned relational expression, the image-capturing optical lens 10 can have high performance and meet the design requirement of low TTL, which is the total optical length of the optical lens, i.e., the on-axis distance from the object-side surface to the image plane of the first lens L1, and has a unit of mm.
Defining the focal length of the sixth lens L6 as f6, -3.20 ≦ f6/f ≦ -1.00, and defining the ratio of the focal length of the sixth lens L6 to the total focal length of the system, so that the system has better imaging quality and lower sensitivity through reasonable distribution of the focal lengths.
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, -6.56 ≦ (R1+ R2)/(R1-R2) ≦ 0.68, and the shape of the first lens L1 is reasonably controlled, so that the first lens L1 can effectively correct the system spherical aberration. Preferably, it satisfies-4.10. ltoreq. (R1+ R2)/(R1-R2). ltoreq.0.54.
The on-axis thickness of the first lens L1 is defined as d1, and d1/TTL is not less than 0.03 and not more than 0.12, which is beneficial to realizing ultra-thinning. Preferably, 0.05. ltoreq. d 1/TTL. ltoreq.0.09 is satisfied.
Further, -29.34 ≦ f2/f ≦ -0.32, which is advantageous for correcting aberrations of the optical system by controlling the negative power of the second lens L2 in a reasonable range. Preferably, it satisfies-18.34. ltoreq. f 2/f. ltoreq-0.39.
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, -0.49 ≦ (R3+ R4)/(R3-R4) ≦ 23.12, and the shape of the second lens L2 is defined, so that the problem of axial aberration can be corrected as the lens is made to be ultra-thin and wide-angle within the range. Preferably, it satisfies-0.31 ≦ (R3+ R4)/(R3-R4). ltoreq.18.50.
The on-axis thickness d3 of the second lens L2 also satisfies the following relationship: d3/TTL is more than or equal to 0.02 and less than or equal to 0.09, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.07 is satisfied.
The focal length of the third lens L3 is defined as f3, f3/f is defined as being equal to or less than 0.47 and equal to or less than 3.36, the ratio of the focal length of the third lens L3 to the total focal length of the system is defined, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.75. ltoreq. f 3/f. ltoreq.2.68 is satisfied.
The on-axis thickness of the third lens L3 is defined as d5, and d5/TTL is not less than 0.04 and not more than 0.17, which is beneficial to realizing ultra-thinning. Preferably, 0.06. ltoreq. d 5/TTL. ltoreq.0.13 is satisfied.
Defining the focal length of the fourth lens L4 as f4, -22.97 ≦ f4/f ≦ 96.86, and defining the ratio of the focal length of the fourth lens L4 to the total focal length of the system, the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, it satisfies-14.35. ltoreq. f 4/f. ltoreq. 77.49.
The curvature radius of the object side surface of the fourth lens L4 is defined as R7, the curvature radius of the image side surface of the fourth lens L4 is defined as R8, -8.27 ≦ (R7+ R8)/(R7-R8) ≦ 68.91, and the shape of the fourth lens L4 is defined, so that when the shape is within the defined range, problems such as off-axis angular aberration and the like are favorably corrected along with the development of ultra-thin wide-angle. Preferably, it satisfies-5.17 ≦ (R7+ R8)/(R7-R8). ltoreq.55.13.
The on-axis thickness of the fourth lens L4 is defined as d7, and d7/TTL is not less than 0.02 and not more than 0.07, which is beneficial to realizing ultra-thinning. Preferably, 0.03. ltoreq. d 7/TTL. ltoreq.0.06 is satisfied.
The focal length of the fifth lens L5 is defined as f5, f5/f is defined as being not less than 1.32 and not more than 52.78, and the definition of the fifth lens L5 can effectively make the light angle of the camera lens smooth and reduce tolerance sensitivity. Preferably, 2.11. ltoreq. f 5/f. ltoreq. 42.22 is satisfied.
The curvature radius of the object side surface of the fifth lens L5 is defined as R9, the curvature radius of the image side surface of the fifth lens L5 is defined as R10, the curvature radius of 0.15 ≦ (R9+ R10)/(R9-R10) is defined as 20.26 or less, and the shape of the fifth lens L5 is defined, so that problems such as off-axis aberration and the like are favorably corrected as the ultra-thin wide angle is increased within the condition range. Preferably, 0.23. ltoreq. (R9+ R10)/(R9-R10). ltoreq.16.21 is satisfied.
The on-axis thickness of the fifth lens L5 is defined as d9, and d9/TTL is not less than 0.04 and not more than 0.21, which is beneficial to realizing ultra-thinning. Preferably, 0.07. ltoreq. d 9/TTL. ltoreq.0.17 is satisfied.
The curvature radius of the object side surface of the sixth lens L6 is defined as R11, the curvature radius of the image side surface of the sixth lens L6 is defined as R12, -5.94 ≦ (R11+ R12)/(R11-R12) ≦ -1.06, and the shape of the sixth lens L6 is defined, so that when the shape is within the defined range, problems such as off-axis aberration and the like are favorably corrected as the ultra-thin wide angle is increased. Preferably, it satisfies-3.71 ≦ (R11+ R12)/(R11-R12). ltoreq.1.33.
The on-axis thickness of the sixth lens L6 is defined as d11, and d11/TTL is not less than 0.02 and not more than 0.17, which is beneficial to realizing ultra-thinning. Preferably, 0.03. ltoreq. d 11/TTL. ltoreq.0.13 is satisfied.
Defining the focal length of the seventh lens L7 as f7, f7/f is less than or equal to 0.38 and less than or equal to 2.73, and defining the ratio of the focal length of the seventh lens L7 to the total focal length of the system, and enabling the system to have better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.60. ltoreq. f 7/f. ltoreq.2.19 is satisfied.
The curvature radius of the object side surface of the seventh lens L7 is defined as R13, the curvature radius of the image side surface of the seventh lens L7 is defined as R14, -10.33 ≦ (R13+ R14)/(R13-R14) ≦ -0.31, and the shape of the seventh lens L7 is defined, so that problems such as off-axis aberration and the like are favorably corrected as the ultra-thin wide angle is increased within the condition range. Preferably, it satisfies-6.45 ≦ (R13+ R14)/(R13-R14) ≦ -0.39.
The on-axis thickness of the seventh lens L7 is defined as d13, and d13/TTL is not less than 0.03 and not more than 0.26, which is beneficial to realizing ultra-thinning. Preferably, 0.04. ltoreq. d 13/TTL. ltoreq.0.21 is satisfied.
Defining the focal length of the eighth lens L8 as f8, -2.00 ≦ f8/f ≦ -0.48, and defining the ratio of the focal length of the eighth lens L8 to the total focal length of the system, so that the system has better imaging quality and lower sensitivity through reasonable distribution of the focal lengths. Preferably, it satisfies-1.25. ltoreq. f 8/f. ltoreq-0.60.
The radius of curvature of the object-side surface of the eighth lens L8 is defined as R15, the radius of curvature of the image-side surface of the eighth lens L8 is defined as R16, 0.29 ≦ (R15+ R16)/(R15-R16) ≦ 3.69, and the shape of the eighth lens L8 is defined, so that it is advantageous to correct the off-axis aberration and other problems as the angle of view increases with the increase in the ultra-thin wide angle within the condition range. Preferably, 0.46. ltoreq. (R15+ R16)/(R15-R16). ltoreq.2.95 is satisfied.
The on-axis thickness of the eighth lens L8 is defined as d15, and d15/TTL is not less than 0.02 and not more than 0.06, which is beneficial to realizing ultra-thinning. Preferably, 0.03. ltoreq. d 15/TTL. ltoreq.0.05 is satisfied.
In this embodiment, TTL/IH is not greater than 2.05, FOV is not less than 69.00 °, Fno is not greater than 1.91, where IH is the image height of the image pickup optical lens 10, FOV is the field angle in the diagonal direction, and Fno is the aperture F number, that is, the ratio of the effective focal length to the entrance pupil aperture. In this way, the imaging optical lens 10 can satisfy design requirements of a large aperture, a wide angle, and an ultra-thin structure while having good optical imaging performance.
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.
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, and a specific implementation scheme is as follows.
Table 1 shows design data of the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 1 ]
Wherein each symbol has the following meaning.
S1: 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;
v 8: 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 ]
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric coefficients.
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. 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 | Position of reverse curvature 3 | Position of reverse curve 4 | Position of reverse curve 5 | |
| P1R1 | ||||||
| P1R2 | ||||||
| P2R1 | 2 | 0.665 | 0.895 | |||
| P2R2 | 1 | 1.095 | ||||
| P3R1 | ||||||
| P3R2 | 1 | 1.135 | ||||
| P4R1 | ||||||
| P4R2 | ||||||
| P5R1 | ||||||
| P5R2 | 1 | 1.375 | ||||
| P6R1 | ||||||
| P6R2 | 1 | 1.465 | ||||
| P7R1 | 2 | 0.715 | 1.855 | |||
| P7R2 | 3 | 0.905 | 1.795 | 1.885 | ||
| P8R1 | 3 | 0.235 | 1.335 | 2.075 | ||
| P8R2 | 5 | 0.555 | 1.835 | 2.245 | 2.505 | 2.515 |
[ TABLE 4 ]
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 546nm, 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 13 shown later shows values of various numerical values in examples 1, 2, and 3 corresponding to the parameters specified in the conditional expressions.
As shown in table 13, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2.072mm, a full field height of 2.800mm, a diagonal field angle of 69.80 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(second embodiment)
The second embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.
Table 5 shows design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 6 ]
Table 7 shows 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 | 1 | 0.825 | |
| P1R2 | 2 | 0.895 | 0.935 |
| P2R1 | 2 | 0.855 | 0.955 |
| P2R2 | 2 | 0.495 | 0.935 |
| P3R1 | 2 | 0.525 | 1.025 |
| P3R2 | 1 | 1.185 | |
| P4R1 | 1 | 1.165 | |
| P4R2 | 1 | 1.255 | |
| P5R1 | 2 | 0.705 | 1.395 |
| P5R2 | 1 | 1.515 | |
| P6R1 | 2 | 0.695 | 1.275 |
| P6R2 | 2 | 0.395 | 1.455 |
| P7R1 | 1 | 0.865 | |
| P7R2 | 2 | 0.945 | 1.805 |
| P8R1 | 2 | 0.275 | 1.755 |
| P8R2 | 1 | 0.515 |
[ TABLE 8 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| P1R1 | |||
| P1R2 | |||
| P2R1 | |||
| P2R2 | 2 | 0.885 | 0.965 |
| P3R1 | 1 | 0.835 | |
| P3R2 | |||
| P4R1 | |||
| P4R2 | |||
| P5R1 | 2 | 0.975 | 1.565 |
| P5R2 | |||
| P6R1 | |||
| P6R2 | 1 | 0.735 | |
| P7R1 | 1 | 1.375 | |
| P7R2 | 1 | 1.435 | |
| P8R1 | 1 | 0.495 | |
| P8R2 | 1 | 1.675 |
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 546nm, 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 13, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.888mm, a full field height of 2.800mm, a diagonal field angle of 74.80 °, a wide angle, and a high profile, and has excellent optical characteristics with 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.
Table 9 shows design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
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 ]
Table 11 shows the inflection point and stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 11 ]
[ TABLE 12 ]
| Number of stagnation points | Location of stagnation 1 | |
| P1R1 | ||
| P1R2 | ||
| P2R1 | ||
| P2R2 | ||
| P3R1 | ||
| P3R2 | ||
| P4R1 | ||
| P4R2 | ||
| P5R1 | 1 | 0.215 |
| P5R2 | ||
| P6R1 | ||
| P6R2 | ||
| P7R1 | 1 | 1.335 |
| P7R2 | ||
| P8R1 | ||
| P8R2 | 1 | 1.855 |
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 546nm, 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 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 system of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2.080mm, a full field image height of 2.800mm, a diagonal field angle of 69.69 °, a wide angle, and a thin profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 13 ]
Where f12 denotes a combined focal length of the first lens L1 and the second lens L2.
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, a fifth lens element with positive refractive power, a sixth lens element with negative refractive power, a seventh lens element with positive refractive power, and an eighth lens element with negative refractive power;
the focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the curvature radius of the object-side surface of the third lens is R5, the curvature radius of the image-side surface of the third lens is R6, the on-axis thickness of the second lens is d3, 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 relational expression is satisfied:
0.60≤f1/f≤1.90；
f2≤0；
-1.00≤(R5+R6)/(R5-R6)≤-0.34；
2.00≤d3/d4≤8.00。
2. the imaging optical lens according to claim 1, wherein the sixth lens has a focal length f6 and satisfies the following relationship:
-3.20≤f6/f≤-1.00。
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:
-6.56≤(R1+R2)/(R1-R2)≤0.68；
0.03≤d1/TTL≤0.12。
4. the imaging 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, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:
-29.34≤f2/f≤-0.32；
-0.49≤(R3+R4)/(R3-R4)≤23.12；
0.02≤d3/TTL≤0.09。
5. the image-capturing optical lens of claim 1, wherein the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:
0.47≤f3/f≤3.36；
0.04≤d5/TTL≤0.17。
6. the image-capturing optical lens unit according to claim 1, wherein the fourth lens element has a focal length f4, a radius of curvature of an object-side surface of the fourth lens element is R7, a radius of curvature of an image-side surface of the fourth lens element is R8, an on-axis thickness of the fourth lens element is d7, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-22.97≤f4/f≤96.86；
-8.27≤(R7+R8)/(R7-R8)≤68.91；
0.02≤d7/TTL≤0.07。
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:
1.32≤f5/f≤52.78；
0.15≤(R9+R10)/(R9-R10)≤20.26；
0.04≤d9/TTL≤0.21。
8. the image-capturing optical lens unit according to claim 1, wherein the curvature radius of the object-side surface of the sixth lens element is R11, the curvature radius 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 image-capturing optical lens unit is TTL, and the following relationships are satisfied:
-5.94≤(R11+R12)/(R11-R12)≤-1.06；
0.02≤d11/TTL≤0.17。
9. the image-taking optical lens according to claim 1, wherein the seventh lens element has a focal length f7, a radius of curvature of an object-side surface of the seventh lens element is R13, a radius of curvature of an image-side surface of the seventh lens element is R14, an on-axis thickness of the seventh lens element is d13, an optical total length of the image-taking optical lens is TTL, and the following relationship is satisfied:
0.38≤f7/f≤2.73；
-10.33≤(R13+R14)/(R13-R14)≤-0.31；
0.03≤d13/TTL≤0.26。
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, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-2.00≤f8/f≤-0.48；
0.29≤(R15+R16)/(R15-R16)≤3.69；
0.02≤d15/TTL≤0.06。
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