CN111025561B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111025561B CN111025561B CN201911342412.2A CN201911342412A CN111025561B CN 111025561 B CN111025561 B CN 111025561B CN 201911342412 A CN201911342412 A CN 201911342412A CN 111025561 B CN111025561 B CN 111025561B
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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, and a sixth lens; and satisfies the following relationships: f4/f is more than or equal to 1.80 and less than or equal to 5.00; f6/f7 is more than or equal to-1.50 and less than or equal to-1.00; d8/d9 is more than or equal to 1.20 and less than or equal to 1.60. The imaging optical lens of the invention has good optical performance such as wide angle and ultra-thin.
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 and seven-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 element with positive refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and a sixth 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 fourth lens is f4, the focal length of the fifth lens is f5, the on-axis thickness of the fifth lens is d9, the on-axis distance from the image side surface of the fifth lens to the object side surface of the sixth lens is d10, the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, and the following relational expressions are satisfied:
5.00≤f1/f≤15.00；
3.00≤d9/d10≤10.00；
3.00≤(R1+R2)/(R1-R2)≤20.00；
-3.50≤f4/f5≤-1.50。
preferably, 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 following relationship is satisfied:
R5/R6≥10.00。
preferably, the on-axis thickness of the first lens is d1, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied:
0.03≤d1/TTL≤0.19。
preferably, the focal length of the second lens element is f2, 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, the on-axis thickness of the second lens element is d3, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied:
0.94≤f2/f≤4.06；
-7.33≤(R3+R4)/(R3-R4)≤-1.47；
0.03≤d3/TTL≤0.11。
preferably, the focal length of the third lens element is f3, the radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, the on-axis thickness of the third lens element is d5, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationships:
1.05≤f3/f≤4.19；
0.53≤(R5+R6)/(R5-R6)≤1.83；
0.03≤d5/TTL≤0.11。
preferably, the curvature radius of the object-side surface of the fourth lens element is R7, the curvature radius of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship:
-4.29≤f4/f≤-1.05；
-0.49≤(R7+R8)/(R7-R8)≤0.41；
0.03≤d7/TTL≤0.10。
preferably, 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 total optical length of the imaging optical lens system is TTL and satisfies the following relational expression:
0.03≤f5/f≤1.58；
0.74≤(R9+R10)/(R9-R10)≤2.69；
0.10≤d9/TTL≤0.34。
preferably, the focal length of the sixth lens element is f6, the radius of curvature of the object-side surface of the sixth lens element is R11, the radius of curvature of the image-side surface of the sixth lens element is R12, the on-axis thickness of the sixth lens element is d11, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationships:
-3.28≤f6/f≤-0.44；
0.82≤(R11+R12)/(R11-R12)≤5.24；
0.04≤d11/TTL≤0.16。
preferably, the combined focal length of the first lens and the second lens is f12, and the following relation is satisfied:
0.79≤f12/f≤2.58。
preferably, the F number of the diaphragm of the imaging optical lens is FNO, and the following relation is satisfied:
FNO≤1.76。
the invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, satisfies the requirements of ultra-thinning and wide angle, and is particularly suitable for a mobile phone imaging lens assembly and a WEB imaging lens which are composed of imaging 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 six lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: a first lens L1, a stop S1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. An optical element such as an optical filter (filter) GF may be disposed between the sixth lens L6 and the image plane Si.
Defining the focal length f of the whole image pickup optical lens 10, the focal length f1 of the first lens L1, f1/f 5.00-15.00, and defining the ratio of the focal length of the first lens L1 to the focal length of the image pickup optical lens 10 can effectively balance the spherical aberration and the field curvature of the system.
The on-axis thickness of the fifth lens L5 is defined as d9, the on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6 is defined as d10, and the 3.00-d 9/d 10-10.00, and the ratio of the thickness of the fifth lens L5 to the air space between the fifth lens L5 and the sixth lens L6 is defined, so that the total optical length can be compressed and the ultrathin effect can be realized within the condition range.
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, 3.00 ≦ (R1+ R2)/(R1-R2) ≦ 20.00, and the shape of the first lens L1 is defined, so that the deflection degree of light rays passing through the lens can be alleviated and the aberration can be effectively reduced within the condition range.
The focal length of the fourth lens L4 is defined as f4, the focal length of the fifth lens L5 is defined as f5, -3.50 and f4/f5 and-1.50, the ratio of the focal lengths of the fourth lens L4 and the fifth lens L5 is defined, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal lengths.
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, the on-axis thickness, and the radius of curvature of the lens according to the present invention satisfy the above-mentioned relational expressions, it is possible to provide a wide-angle, ultra-thin image pickup optical lens 10 having excellent optical performance.
The curvature radius of the object side surface of the third lens L3 is R5, the curvature radius of the side surface of the third lens L3 is R6, R5/R6 is not less than 10.00, and the shape of the third lens L3 is defined.
The on-axis thickness of the first lens L1 is d1, the total optical length of the photographic optical lens 10 is TTL, and d1/TTL is not less than 0.03 and not more than 0.19, which is beneficial to realizing ultra-thinning. Preferably, 0.05. ltoreq. d 1/TTL. ltoreq.0.15 is satisfied.
The focal length of the second lens L2 is f2, f2/f is more than or equal to 0.94 and less than or equal to 4.06, and the positive focal power of the second lens L2 is controlled in a reasonable range, so that the aberration of the optical system can be corrected. Preferably, 1.50. ltoreq. f 2/f. ltoreq.3.25 is satisfied.
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, -7.33 (R3+ R4)/(R3-R4) is not more than-1.47, and the shape of the second lens L2 is defined. Preferably, it satisfies-4.58 ≦ (R3+ R4)/(R3-R4). ltoreq.1.84.
The on-axis thickness of the second lens L2 is d3, the total optical length of the photographic optical lens 10 is TTL, and d3/TTL is not less than 0.03 and not more than 0.11, which is beneficial to realizing ultra-thinning. Preferably, 0.06. ltoreq. d 3/TTL. ltoreq.0.09 is satisfied.
The focal length of the third lens L3 is f3, f3/f is more than or equal to 1.05 and less than or equal to 4.19, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 1.68. ltoreq. f 3/f. ltoreq.3.35 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, and the (R5+ R6)/(R5-R6) is not more than 0.53 and not more than 1.83, so that the shape of the third lens L3 can be effectively controlled, the molding of the third lens L3 is facilitated, and the deflection degree of light rays passing through the lenses can be alleviated and the aberration can be effectively reduced within the condition range. Preferably, 0.84. ltoreq. R5+ R6)/(R5-R6. ltoreq.1.47 is satisfied.
The on-axis thickness of the third lens L3 is d5, the total optical length of the photographic optical lens 10 is TTL, and d5/TTL is greater than or equal to 0.03 and less than or equal to 0.11, which is beneficial to achieving ultra-thinning. Preferably, 0.06. ltoreq. d 5/TTL. ltoreq.0.09 is satisfied.
The focal length of the fourth lens L4 is f4, -4.29 is more than or equal to f4/f is more than or equal to-1.05, the ratio of the focal length of the fourth lens to the focal length of the system is specified, and the performance of the optical system is improved within the conditional expression range. Preferably, it satisfies-2.68. ltoreq. f 4/f. ltoreq-1.32.
The radius of curvature of the side surface of the fourth lens element L4 is R7, the radius of curvature of the side surface of the fourth lens image L4 is R8, -0.49 ≦ (R7+ R8)/(R7-R8) ≦ 0.41, and the shape of the fourth lens element L4 is specified, and therefore, when the condition is within this range, it is advantageous to correct the off-axis aberration and the like as the ultra-thin wide angle is increased. Preferably, it satisfies-0.31 ≦ (R7+ R8)/(R7-R8). ltoreq.0.33.
The on-axis thickness of the fourth lens L4 is d7, the total optical length of the photographic optical lens 10 is TTL, and d7/TTL is greater than or equal to 0.03 and less than or equal to 0.10, which is beneficial to achieving ultra-thinning. Preferably, 0.05. ltoreq. d 7/TTL. ltoreq.0.08 is satisfied.
The focal length of the fifth lens L5 is f5, f5/f is more than or equal to 0.03 and less than or equal to 1.58, and the limitation on the fifth lens L5 can effectively make the light ray angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, 0.48. ltoreq. f 5/f. ltoreq.1.26 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, 0.74 (R9+ R10)/(R9-R10) is 2.69 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 this condition range. Preferably, 1.18. ltoreq. (R9+ R10)/(R9-R10). ltoreq.2.15 is satisfied.
The on-axis thickness of the fifth lens L5 is d7, the total optical length of the photographic optical lens 10 is TTL, and d9/TTL is not less than 0.10 and not more than 0.34, so that ultra-thinning is facilitated. Preferably, 0.15. ltoreq. d 9/TTL. ltoreq.0.28 is satisfied.
The focal length of the sixth lens L6 is f6, -3.28 ≦ f6/f ≦ -0.44, and the system has better imaging quality and lower sensitivity through reasonable distribution of optical power. Preferably, it satisfies-2.05. ltoreq. f 6/f. ltoreq-0.55.
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, 0.82 ≦ (R11+ R12)/(R11-R12) or less 5.24, and the shape of the sixth lens L6 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 this condition range. Preferably, 1.31 ≦ (R11+ R12)/(R11-R12) ≦ 4.19.
The on-axis thickness of the sixth lens L6 is d11, the total optical length of the photographic optical lens 10 is TTL, and d11/TTL is greater than or equal to 0.04 and less than or equal to 0.16, which is beneficial to achieving ultra-thinning. Preferably, 0.06. ltoreq. d 11/TTL. ltoreq.0.13 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 0.79 and not more than 2.58, and within the condition range, 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, 1.26. ltoreq. f 12/f. ltoreq.2.06.
In the present embodiment, the number of apertures F of the imaging optical lens 10 is 1.76 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number is less than or equal to 1.73.
In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 7.13 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL is less than or equal to 6.80 millimeters.
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: radius of curvature of the object side of the optical filter GF;
r14: 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: the on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the optical filter GF;
d 13: on-axis thickness of the optical filter GF;
d 14: 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;
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;
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.
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, and P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, 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 | 1 | 1.385 | |
| P1R2 | 1 | 1.145 | |
| P2R1 | |||
| P2R2 | |||
| P3R1 | |||
| P3R2 | |||
| P4R1 | |||
| P4R2 | 2 | 0.575 | 1.475 |
| P5R1 | 1 | 1.625 | |
| P5R2 | |||
| P6R1 | 1 | 0.865 | |
| P6R2 | 1 | 2.095 |
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 2.115mm, a full field image height of 4.000mm, a diagonal field angle of 95.00 °, 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 | 2 | 0.755 | 2.075 | |
| P1R2 | 1 | 0.615 | ||
| P2R1 | ||||
| P2R2 | ||||
| P3R1 | 1 | 1.075 | ||
| P3R2 | 1 | 1.185 | ||
| P4R1 | ||||
| P4R2 | 2 | 0.325 | 1.195 | |
| P5R1 | 2 | 1.025 | 1.645 | |
| P5R2 | 2 | 1.355 | 1.955 | |
| P6R1 | 3 | 0.415 | 1.985 | 2.695 |
| P6R2 | 1 | 0.735 |
[ TABLE 8 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| P1R1 | 1 | 1.415 | |
| P1R2 | 1 | 1.135 | |
| P2R1 | |||
| P2R2 | |||
| P3R1 | |||
| P3R2 | |||
| P4R1 | |||
| P4R2 | 2 | 0.575 | 1.455 |
| P5R1 | 1 | 1.445 | |
| P5R2 | |||
| P6R1 | 1 | 0.815 | |
| P6R2 | 1 | 2.135 |
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 2.113mm, a full field image height of 4.000mm, a diagonal field angle of 95.00 °, 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 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Position of reverse curvature 3 | |
| P1R1 | 1 | 0.745 | ||
| P1R2 | 1 | 0.505 | ||
| P2R1 | ||||
| P2R2 | ||||
| P3R1 | 1 | 1.045 | ||
| P3R2 | 1 | 1.145 | ||
| P4R1 | ||||
| P4R2 | 2 | 0.305 | 1.215 | |
| P5R1 | 2 | 1.025 | 1.565 | |
| P5R2 | 2 | 1.305 | 1.865 | |
| P6R1 | 3 | 0.455 | 2.075 | 2.805 |
| P6R2 | 3 | 0.705 | 3.095 | 3.345 |
[ TABLE 12 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| P1R1 | 1 | 1.325 | |
| P1R2 | 1 | 0.975 | |
| P2R1 | |||
| P2R2 | |||
| P3R1 | |||
| P3R2 | |||
| P4R1 | |||
| P4R2 | 2 | 0.515 | 1.465 |
| P5R1 | 1 | 1.425 | |
| P5R2 | |||
| P6R1 | 1 | 0.955 | |
| P6R2 | 1 | 2.035 |
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.
As shown in table 17, the third embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2.091mm, a full field image height of 4.000mm, a diagonal field angle of 95.00 °, a wide angle, and a high profile, and has excellent optical characteristics with 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 ]
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 ]
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 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Position of reverse curvature 3 | |
| P1R1 | 2 | 0.755 | 2.075 | |
| P1R2 | 1 | 0.615 | ||
| P2R1 | ||||
| P2R2 | ||||
| P3R1 | 1 | 1.075 | ||
| P3R2 | 1 | 1.185 | ||
| P4R1 | ||||
| P4R2 | 2 | 0.325 | 1.195 | |
| P5R1 | 2 | 1.025 | 1.645 | |
| P5R2 | 2 | 1.355 | 1.955 | |
| P6R1 | 3 | 0.415 | 1.985 | 2.695 |
| P6R2 | 1 | 0.735 |
[ TABLE 16 ]
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.
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 2.113mm, a full field image height of 4.000mm, a diagonal field angle of 95.00 °, a wide angle, and a high profile, and has excellent optical characteristics with 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 | 8.63 | 14.99 | 5.01 | 12.76 |
| d9/d10 | 5.26 | 9.97 | 3.01 | 5.08 |
| (R1+R2)/(R1-R2) | 11.99 | 19.97 | 3.00 | 19.49 |
| f4/f5 | -2.41 | -3.50 | -2.70 | -1.50 |
| R5/R6 | 40.98 | 10.01 | 18.89 | 10.63 |
| f | 3.617 | 3.613 | 3.575 | 3.602 |
| f1 | 31.214 | 54.157 | 17.893 | 45.976 |
| f2 | 7.543 | 6.757 | 9.687 | 6.747 |
| f3 | 8.810 | 9.052 | 9.993 | 7.563 |
| f4 | -7.005 | -7.538 | -7.665 | -5.684 |
| f5 | 2.905 | 2.155 | 2.838 | 3.789 |
| f6 | -3.623 | -2.376 | -3.683 | -5.909 |
| f12 | 5.935 | 5.847 | 6.140 | 5.693 |
| Fno | 1.71 | 1.71 | 1.71 | 1.71 |
Wherein, Fno: the F number of the diaphragm.
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 six lenses, in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power;
the object side surface of the first lens is a concave surface at the paraxial position, and the image side surface of the first lens is a convex surface at the paraxial position; the object side surface of the second lens is convex at the paraxial part, and the image side surface of the second lens is concave at the paraxial part; the object side surface of the third lens is a concave surface at the paraxial position, and the image side surface of the third lens is a convex surface at the paraxial position; the object side surface of the fourth lens is concave at the paraxial region, and the image side surface of the fourth lens is concave at the paraxial region; the object side surface of the fifth lens is a concave surface at the paraxial position, and the image side surface of the fifth lens is a convex surface at the paraxial position; the object side surface of the sixth lens element is convex at the paraxial region, and the image side surface of the sixth lens element is concave at the paraxial region;
the focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the on-axis thickness of the fifth lens is d9, the on-axis distance from the image side surface of the fifth lens to the object side surface of the sixth lens is d10, the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, and the following relational expressions are satisfied:
5.00≤f1/f≤15.00；
3.00≤d9/d10≤10.00；
3.00≤(R1+R2)/(R1-R2)≤20.00；
-3.50≤f4/f5≤-1.50。
2. the imaging optical lens of claim 1, wherein 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 following relationship is satisfied:
10.00≤R5/R6≤40.98。
3. a photographic optical lens according to claim 1, characterized in that the on-axis thickness of the first lens is d1, the total optical length of the photographic optical lens is TTL, and the following relation is satisfied:
0.03≤d1/TTL≤0.19。
4. the imaging optical lens of claim 1, wherein the second lens has a focal length of f2, a radius of curvature of an object-side surface of the second lens is R3, a radius of curvature of an image-side surface of the second lens is R4, an on-axis thickness of the second lens is d3, and an optical total length of the imaging optical lens is TTL and satisfies the following relationship:
0.94≤f2/f≤4.06；
-7.33≤(R3+R4)/(R3-R4)≤-1.47；
0.03≤d3/TTL≤0.11。
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, an on-axis thickness of the third lens is d5, and the imaging optical lens has a total optical length of TTL and satisfies the following relationship:
1.05≤f3/f≤4.19；
0.53≤(R5+R6)/(R5-R6)≤1.83；
0.03≤d5/TTL≤0.11。
6. the image-capturing optical lens unit according to claim 1, wherein the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:
-4.29≤f4/f≤-1.05；
-0.49≤(R7+R8)/(R7-R8)≤0.41；
0.03≤d7/TTL≤0.10。
7. the imaging optical lens of claim 1, wherein 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, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:
0.03≤f5/f≤1.58；
0.74≤(R9+R10)/(R9-R10)≤2.69；
0.10≤d9/TTL≤0.34。
8. the image-capturing optical lens unit according to claim 1, wherein the sixth lens element has a focal length f6, a radius of curvature of an object-side surface of the sixth lens element is R11, a radius of curvature of an image-side surface of the sixth lens element is R12, an on-axis thickness of the sixth lens element is d11, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-3.28≤f6/f≤-0.44；
0.82≤(R11+R12)/(R11-R12)≤5.24；
0.04≤d11/TTL≤0.16。
9. the imaging optical lens according to claim 1, wherein a combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied:
0.79≤f12/f≤2.58。
10. an imaging optical lens according to claim 1, wherein the F-number of the diaphragm of the imaging optical lens is FNO, and the following relationship is satisfied:
FNO≤1.76。
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