CN111025553B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111025553B CN111025553B CN201911340008.1A CN201911340008A CN111025553B CN 111025553 B CN111025553 B CN 111025553B CN 201911340008 A CN201911340008 A CN 201911340008A CN 111025553 B CN111025553 B CN 111025553B
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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 0.78 and less than or equal to 1.90; f2 is less than or equal to 0 mm; (R13+ R14)/(R13-R14) is not more than 0.20 and not more than 0.90; d11/d12 is more than or equal to 4.00 and less than or equal to 25.00. 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, the eight-piece lens structure gradually appears in the design of the lens. It is highly desirable to provide a large aperture, wide angle, 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, a wide angle of view, 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, which includes 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 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 on-axis curvature radius of the object-side surface of the seventh lens is R13, the on-axis curvature radius of the image-side surface of the seventh lens is R14, the on-axis thickness of the sixth lens is d11, and the on-axis distance from the image-side surface of the sixth lens to the object-side surface of the seventh lens is d12, which satisfy the following relations:
0.78≤f1/f≤1.90；
f2≤0mm；
0.20≤(R13+R14)/(R13-R14)≤0.90；
4.00≤d11/d12≤25.00。
preferably, the focal length of the fourth lens is f4, and the following relation is satisfied:
4.00≤f4/f≤7.50。
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:
-7.19≤(R1+R2)/(R1-R2)≤-0.70；
0.02≤d1/TTL≤0.14。
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:
-3.60≤f2/f≤-1.02；
1.24≤(R3+R4)/(R3-R4)≤5.28；
0.01≤d3/TTL≤0.04。
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:
0.48≤f3/f≤15.32；
-11.16≤(R5+R6)/(R5-R6)≤-0.53；
0.02≤d5/TTL≤0.17。
preferably, 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, and an on-axis thickness of the fourth lens element is d7, an optical total length of the imaging optical lens system is TTL, and the following relationship is satisfied:
-1.09≤(R7+R8)/(R7-R8)≤0.82；
0.03≤d7/TTL≤0.09。
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:
1.37≤f5/f≤5.79；
0.85≤(R9+R10)/(R9-R10)≤3.07；
0.04≤d9/TTL≤0.15。
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, and the total optical length of the imaging optical lens system is TTL and satisfies the following relation:
-8.67≤f6/f≤-2.81；
-14.17≤(R11+R12)/(R11-R12)≤-3.42；
0.01≤d11/TTL≤0.11。
preferably, the focal length of the seventh lens is f7, the on-axis thickness of the seventh lens is d13, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied:
0.45≤f7/f≤2.44；
0.06≤d13/TTL≤0.25。
preferably, the focal length of the eighth lens element is f8, the curvature radius of the object-side surface of the eighth lens element is R15, the curvature radius of the image-side surface of the eighth lens element is R16, and the on-axis thickness of the eighth lens element is d15, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied:
-1.09≤f8/f≤-0.34；
0.16≤(R15+R16)/(R15-R16)≤1.16；
0.02≤d15/TTL≤0.08。
the invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, satisfies the requirements of a large aperture, a wide angle of view, and an ultra-thin profile, and is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are constituted by high-pixel imaging elements such as 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 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 0.78 and less than or equal to 1.90, the ratio of the focal length of the first lens L1 to the total focal length of the system is specified, and the spherical aberration and the field curvature of the system can be effectively balanced.
Defining the focal length of the second lens L2 as f2, the following relation is satisfied: f2 is less than or equal to 0mm, the positive and negative of the focal length of the second lens L2 are regulated, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal length.
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: 0.20 ≦ (R13+ R14)/(R13-R14) ≦ 0.90, and by defining the shape of the seventh lens L7, the degree of deflection of light rays passing through the lens can be alleviated within the range defined by the conditional expression, and aberration can be effectively reduced.
Defining the on-axis thickness of the sixth lens L6 as d11 and the on-axis thickness of the sixth lens L6 as d12, the following relationships are satisfied: 4.00-d 11/d 12-25.00, and the ratio of the thickness of the sixth lens L6 to the air space of the sixth seventh lens is regulated, so that the total length of the optical system can be compressed and the ultrathin effect can be realized within the range of the conditional expression.
The focal length of the fourth lens L4 is f4, and the series relation is satisfied: f4/f is not less than 4.00 and not more than 7.50, and the ratio of the focal length of the fourth lens L4 to the overall focal length is specified. 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.
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 can satisfy 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, -7.19 (R1+ R2)/(R1-R2) is less than or equal to-0.70, the shape of the first lens L1 is defined, and when the conditional expression specifies the range, the shape of the first lens is favorably and reasonably controlled, so that the first lens can effectively correct the system spherical aberration. Preferably, it satisfies-4.50 ≦ (R1+ R2)/(R1-R2) ≦ -0.87.
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 0.02 and less than or equal to 0.14, and ultra-thinning is favorably realized when the ratio is within the specified range of the conditional expression. Preferably, 0.04. ltoreq. d 1/TTL. ltoreq.0.11 is satisfied.
The focal length of the second lens L2 is f2, and the series relation is satisfied: 3.60 ≦ f2/f ≦ -1.02, and the second lens element L2 has negative refractive power within the range specified by the conditional expression, and correction of aberrations of the optical system is facilitated by controlling the negative power of the second lens element L2 within a reasonable range. Preferably, it satisfies-2.25. ltoreq. f 2/f. ltoreq-1.27.
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 1.24 (R3+ R4)/(R3-R4) is less than or equal to 5.28, and the shape of the second lens L2 is defined, so that the deflection degree of light rays passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, 1.98 ≦ (R3+ R4)/(R3-R4) ≦ 4.23.
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 0.01 and less than or equal to 0.04, which is beneficial to realizing ultra-thinning. Preferably, 0.02. 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: f3/f is more than or equal to 0.48 and less than or equal to 15.32, the ratio of the focal length of the third lens L3 to the total focal length of the system is specified in the conditional expression range, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal length. Preferably, 0.77. ltoreq. f 3/f. ltoreq.12.26 is satisfied.
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, -11.16 ≦ (R5+ R6)/(R5-R6) ≦ -0.53, and the shape of the third lens L3 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-6.98 ≦ (R5+ R6)/(R5-R6) ≦ -0.67.
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 0.02 and less than or equal to 0.17, and ultra-thinning is favorably realized within the specified range of the conditional expression. Preferably, 0.04. ltoreq. d 5/TTL. ltoreq.0.13 is satisfied.
The radius of curvature of the object-side surface of the fourth lens L4 is R7, the radius of curvature of the image-side surface of the fourth lens L4 is R8, -1.09 ≦ (R7+ R8)/(R7-R8) or less 0.82, and the shape of the fourth lens L4 is defined, so that it is advantageous to correct the aberration of the off-axis angle and the like with the development of an extremely thin and wide angle in the conditional expression range. Preferably, it satisfies-0.68 ≦ (R7+ R8)/(R7-R8). ltoreq.0.65.
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 0.03 and less than or equal to 0.09, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 7/TTL. ltoreq.0.07 is satisfied.
The focal length of the fifth lens L5 is f5, and the series relation is satisfied: f5/f is more than or equal to 1.37 and less than or equal to 5.79, and the ratio of the focal length of the fifth lens L5 to the overall focal length is specified. When the light angle of the imaging lens is within a specified range, the light angle of the imaging lens is gentle, and tolerance sensitivity is reduced. Preferably, 2.20. ltoreq. f 5/f. ltoreq.4.63 is satisfied.
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, the (R9+ R10)/(R9-R10) is 0.85 or more and 3.07 or less, and the shape of the fifth lens L5 is defined, so that the problem of aberration of the off-axis angle is favorably corrected with the development of an ultra-thin and wide-angle in the conditional expression range. Preferably, 1.37. ltoreq. (R9+ R10)/(R9-R10). ltoreq.2.45 is satisfied.
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 0.04 and less than or equal to 0.15, and ultra-thinning is facilitated in the condition formula range. Preferably, 0.07. ltoreq. d 9/TTL. ltoreq.0.12 is satisfied.
The focal length of the sixth lens L6 is f6, and the series relation is satisfied: f6/f 2.81 of 8.67. ltoreq. f, which specifies the ratio of the focal length of the sixth lens L6 to the overall focal length. When in the specified range, the system has better imaging quality and lower sensitivity. Preferably, it satisfies-5.42. ltoreq. f 6/f. ltoreq-3.51.
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, -14.17 ≦ (R11+ R12)/(R11-R12) ≦ -3.42, 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-8.86 ≦ (R11+ R12)/(R11-R12) ≦ -4.27.
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 0.01 and less than or equal to 0.11, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 11/TTL. ltoreq.0.09 is satisfied.
The focal length of the seventh lens L7 is f7, and the series relation is satisfied: f7/f is not less than 0.45 and not more than 2.44, and the ratio of the focal length of the seventh lens L7 to the overall focal length is specified. When in the specified range, the system has better imaging quality and lower sensitivity. Preferably, 0.72. ltoreq. f 7/f. ltoreq.1.79 is satisfied.
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 0.06 and less than or equal to 0.25, and ultra-thinning is facilitated. Preferably, 0.09. ltoreq. d 13/TTL. ltoreq.0.20 is satisfied.
The focal length of the eighth lens L8 is f8, and the series relation is satisfied: f8/f is less than or equal to-0.34 of 1.09, and the ratio of the focal length of the eighth lens L8 to the overall focal length is defined. When the optical lens is within the specified range, the system aberration is favorably reduced, and the development of ultra-thinning and wide-angle of the lens is favorably realized. Preferably, it satisfies-0.68. ltoreq. f 8/f. ltoreq-0.42.
The radius of curvature of the object-side surface of the eighth lens element L8 is R15, the radius of curvature of the image-side surface of the eighth lens element L8 is R16, 0.16 ≤ (R15+ R16)/(R15-R16) is ≤ 1.16, and the shape of the eighth lens element L8 is defined, so that it is advantageous to correct the off-axis aberration and other problems with the development of an extremely thin and wide-angle in the conditional expression. Preferably, 0.25. ltoreq. (R15+ R16)/(R15-R16). ltoreq.0.93 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 0.02 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 15/TTL. ltoreq.0.06 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 less than or equal to 61.41 and less than or equal to 5.99, and within the range of the conditional expressions, 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, -38.38. ltoreq. f 12/f. ltoreq.4.79.
In this embodiment, the ratio TTL/IH of the total optical length TTL and the image height IH of the image pickup optical lens 10 is less than or equal to 1.73, which is beneficial to achieving ultra-thinning.
In the present embodiment, the F-number (Fno) of the imaging optical lens 10 is 1.91 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: optical length (on-axis distance from the object side surface of the 1 st lens L1 to the image forming surface) 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 ]
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 ]
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14 and A16 are aspheric coefficients.
IH: image height
y＝(x2/R)/[1+{1-(k+1)(x2/R2)}1/2]+A4x4+A6x6+A8x8+A10x10+A12x12+A14x14+A16x16(1)
For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).
Tables 3 and 4 show the inflection point and stagnation point design data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. 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 ]
[ TABLE 4 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| P1R1 | |||
| P1R2 | |||
| P2R1 | |||
| P2R2 | |||
| P3R1 | 1 | 1.365 | |
| P3R2 | 1 | 0.885 | |
| P4R1 | 1 | 0.525 | |
| P4R2 | |||
| P5R1 | |||
| P5R2 | |||
| P6R1 | |||
| P6R2 | |||
| P7R1 | 1 | 1.635 | |
| P7R2 | |||
| P8R1 | 2 | 4.755 | 4.805 |
| P8R2 | 1 | 3.315 |
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 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 4.479mm, a full field image height of 6.400mm, a diagonal field angle of 72.00 °, a large aperture, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(second embodiment)
The second embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 6 ]
Tables 7 and 8 show the inflection point and stagnation point design data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 7 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Position of reverse curvature 3 | |
| P1R1 | ||||
| P1R2 | ||||
| P2R1 | 1 | 2.215 | ||
| P2R2 | ||||
| P3R1 | 1 | 1.315 | ||
| P3R2 | 1 | 0.255 | ||
| P4R1 | 2 | 0.325 | 1.915 | |
| P4R2 | ||||
| P5R1 | ||||
| P5R2 | ||||
| P6R1 | ||||
| P6R2 | 3 | 2.025 | 2.565 | 3.365 |
| P7R1 | 2 | 0.965 | 3.305 | |
| P7R2 | 2 | 0.805 | 1.545 | |
| P8R1 | 2 | 2.635 | 4.415 | |
| P8R2 | 1 | 1.145 |
[ TABLE 8 ]
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 13, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.376mm, a full field height of 6.400mm, a diagonal field angle of 73.31 °, a large aperture, 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.
Tables 9 and 10 show 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 ]
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 ]
[ TABLE 12 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| P1R1 | |||
| P1R2 | |||
| P2R1 | |||
| P2R2 | |||
| P3R1 | |||
| P3R2 | |||
| P4R1 | 2 | 0.405 | 2.575 |
| P4R2 | |||
| P5R1 | |||
| P5R2 | |||
| P6R1 | |||
| P6R2 | |||
| P7R1 | 1 | 1.215 | |
| P7R2 | 2 | 1.415 | 1.845 |
| P8R1 | 2 | 4.185 | 4.715 |
| P8R2 | 1 | 3.505 |
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 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 4.407mm, a full field height of 6.400mm, a diagonal field angle of 73.39 °, a large aperture, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 13 ]
| Parameters and conditionsFormula (II) | Example 1 | Example 2 | Example 3 |
| f1/f | 0.79 | 1.34 | 1.88 |
| (R13+R14)/(R13-R14) | 0.20 | 0.54 | 0.88 |
| d11/d12 | 14.50 | 4.49 | 24.80 |
| f | 8.509 | 8.314 | 8.373 |
| f1 | 6.680 | 11.140 | 15.741 |
| f2 | -12.994 | -14.967 | -13.472 |
| f3 | 86.932 | 12.121 | 8.111 |
| f4 | 44.070 | 61.737 | 34.744 |
| f5 | 32.842 | 22.841 | 23.351 |
| f6 | -35.826 | -35.903 | -36.298 |
| f7 | 7.685 | 8.832 | 12.487 |
| f8 | -4.292 | -4.302 | -4.584 |
| f12 | 11.722 | 33.217 | -257.106 |
| Fno | 1.90 | 1.90 | 1.90 |
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 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 with positive refractive power, 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 on-axis curvature radius of the object-side surface of the seventh lens is R13, the on-axis curvature radius of the image-side surface of the seventh lens is R14, the on-axis thickness of the sixth lens is d11, and the on-axis distance from the image-side surface of the sixth lens to the object-side surface of the seventh lens is d12, which satisfy the following relations:
0.78≤f1/f≤1.90；
f2≤0mm；
0.20≤(R13+R14)/(R13-R14)≤0.90；
4.00≤d11/d12≤25.00。
2. the imaging optical lens according to claim 1, wherein the fourth lens has a focal length f4 and satisfies the following relationship:
4.00≤f4/f≤7.50。
3. 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:
-7.19≤(R1+R2)/(R1-R2)≤-0.70；
0.02≤d1/TTL≤0.14。
4. 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:
-3.60≤f2/f≤-1.02；
1.24≤(R3+R4)/(R3-R4)≤5.28；
0.01≤d3/TTL≤0.04。
5. 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:
0.48≤f3/f≤15.32；
-11.16≤(R5+R6)/(R5-R6)≤-0.53；
0.02≤d5/TTL≤0.17。
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, and the on-axis thickness of the fourth lens element is d7, the image-capturing optical lens unit has a total optical length TTL, and satisfies the following relationship:
-1.09≤(R7+R8)/(R7-R8)≤0.82；
0.03≤d7/TTL≤0.09。
7. the image-capturing optical lens unit according to claim 1, wherein the focal length of the fifth lens element is f5, the radius of curvature of the object-side surface of the fifth lens element is R9, the radius of curvature 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 optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
1.37≤f5/f≤5.79；
0.85≤(R9+R10)/(R9-R10)≤3.07；
0.04≤d9/TTL≤0.15。
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 the object-side surface of the sixth lens element is R11, a radius of curvature of the image-side surface of the sixth lens element is R12, and the image-capturing optical lens unit has a total optical length TTL satisfying the following relationship:
-8.67≤f6/f≤-2.81；
-14.17≤(R11+R12)/(R11-R12)≤-3.42；
0.01≤d11/TTL≤0.11。
9. the image-taking optical lens according to claim 1, wherein a focal length of the seventh lens is f7, and an on-axis thickness of the seventh lens is d13, an optical total length of the image-taking optical lens is TTL, and the following relationship is satisfied:
0.45≤f7/f≤2.44；
0.06≤d13/TTL≤0.25。
10. the image-taking optical lens 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, and an on-axis thickness d15, and the image-taking optical lens has an optical total length TTL satisfying the following relationship:
-1.09≤f8/f≤-0.34；
0.16≤(R15+R16)/(R15-R16)≤1.16；
0.02≤d15/TTL≤0.08。
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