CN110333590B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN110333590B CN110333590B CN201910581570.7A CN201910581570A CN110333590B CN 110333590 B CN110333590 B CN 110333590B CN 201910581570 A CN201910581570 A CN 201910581570A CN 110333590 B CN110333590 B CN 110333590B
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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
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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
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 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 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 whole imaging optical lens is f, the focal length of the fifth lens is f5, the on-axis thickness of the first lens is d1, the on-axis thickness of the second lens is d3, and the refractive index of the third lens is n3, so that the following relational expressions are satisfied: f5/f is more than or equal to 1.50 and less than or equal to 5.00; d1/d3 is more than or equal to 3.50 and less than or equal to 5.00; n3 is more than or equal to 1.70 and less than or equal to 2.10. The camera optical lens provided by the invention has good optical performance, and meets the design requirements of large aperture, wide angle and ultra-thinness.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of optical lenses, and more particularly, to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging apparatuses such as monitors and PC lenses.
[ background of the invention ]
In recent years, with the rise of smart phones, the demand of miniaturized camera lenses is increasing, and the photosensitive devices of general camera lenses are not limited to two types, namely, a Charge Coupled Device (CCD) or a Complementary Metal-oxide semiconductor (CMOS) Sensor, and due to the advanced semiconductor manufacturing process technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed with a good function, a light weight, a small size and a light weight, so that the miniaturized camera lenses with good imaging quality are the mainstream in the current market.
In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts three-piece, four-piece, or even five-piece or six-piece lens structures. However, with the development of technology and the increasing demand of diversified users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system for the imaging quality is continuously improved, a six-piece lens structure gradually appears in the lens design, although the common six-piece lens has good optical performance, the focal power, the lens pitch and the lens shape setting still have certain irrationality, so that the design requirements of large aperture, ultra-thinning and wide-angle cannot be met while the lens structure has good optical performance.
[ summary of the invention ]
In view of the above problems, an object of the present invention is to provide an imaging optical lens that has good optical performance and satisfies design requirements for a large aperture, ultra-thin thickness, and wide angle.
To solve the above-mentioned problems, 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 negative 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 whole imaging optical lens is f, the focal length of the fifth lens is f5, the on-axis thickness of the first lens is d1, the on-axis thickness of the second lens is d3, and the refractive index of the third lens is n3, so that the following relational expressions are satisfied:
1.50≤f5/f≤5.00；
3.50≤d1/d3≤5.00；
1.70≤n3≤2.10。
preferably, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, and the following relationship is satisfied: 4.00 is less than or equal to (R3+ R4)/(R3-R4) is less than or equal to 20.00.
Preferably, 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 following relationship is satisfied: the ratio of (R9+ R10)/(R9-R10) is not less than-10.00 and not more than-3.00.
Preferably, the focal length of the first lens element is f1, 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, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship:
0.49≤f1/f≤1.65；
-5.32≤(R1+R2)/(R1-R2)≤-1.26；
0.08≤d1/TTL≤0.29。
preferably, the focal length of the second lens element is f2, the total optical length of the image pickup optical lens is TTL, and the following relationship is satisfied:
-30.33≤f2/f≤-2.57；
0.02≤d3/TTL≤0.07。
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, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied:
0.90≤f3/f≤2.93；
0.27≤(R5+R6)/(R5-R6)≤4.25；
0.03≤d5/TTL≤0.12。
preferably, the focal length of the fourth lens element is f4, the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied:
-4.93≤f4/f≤-0.91；
-7.82≤(R7+R8)/(R7-R8)≤0.03；
0.03≤d7/TTL≤0.09。
preferably, the on-axis thickness of the fifth lens element is d9, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: d9/TTL is more than or equal to 0.04 and less than or equal to 0.21.
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:
-8.50≤f6/f≤-0.99；
1.26≤(R11+R12)/(R11-R12)≤9.04；
0.05≤d11/TTL≤0.20。
preferably, the total optical length of the image pickup optical lens is TTL, the image height of the image pickup optical lens is IH, the focal number of the image pickup optical lens is FNO, and the following relationship is satisfied:
TTL/IH≤1.45；
FNO≤1.70。
the invention has the advantages that the camera optical lens has good optical performance, has the characteristics of large aperture, wide angle and ultra-thin, and is particularly suitable for mobile phone camera lens components and WEB camera lenses which are composed of high-pixel CCD, CMOS and other camera elements.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment;
fig. 2 is a schematic view of axial aberrations of the image-taking optical lens shown in fig. 1;
fig. 3 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 1;
FIG. 4 is a schematic view of curvature of field and distortion of the imaging optical lens shown in FIG. 1;
fig. 5 is a schematic configuration diagram of an imaging optical lens according to a second embodiment;
fig. 6 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 5;
fig. 7 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 5;
FIG. 8 is a schematic view of curvature of field and distortion of the imaging optical lens shown in FIG. 5;
fig. 9 is a schematic configuration diagram of an imaging optical lens according to a third embodiment;
fig. 10 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 9;
fig. 11 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 9;
fig. 12 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 9;
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.
(first embodiment)
Referring to the drawings, the present invention provides an image pickup optical lens 10. Fig. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes six lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: the stop S1, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. An optical element such as an optical filter (filter) GF may be disposed between the sixth lens L6 and the image plane Si.
In the present embodiment, the focal length of the entire imaging optical lens is defined as f, and the focal length of the fifth lens L5 is defined as f5, and the following relational expression is satisfied: f5/f is more than or equal to 1.50 and less than or equal to 5.00, the ratio of the focal length of the fifth lens L5 to the focal length of the whole shooting optical lens is specified, the focal length of the fifth lens L5 can be effectively distributed within a condition range, the aberration of an optical system is corrected, and the imaging quality is improved.
Defining the on-axis thickness of the first lens L1 as d1 and the on-axis thickness of the second lens L2 as d3, the following relations are satisfied: 3.50 < d1/d3 < 5.00, and the ratio of the thickness of the first lens L1 to the thickness of the second lens L2 is specified, which facilitates lens processing and lens assembly within a range of conditions.
Defining the refractive index of the third lens L3 as n3, satisfying the following relation: 1.70 is less than or equal to n3 is less than or equal to 2.10, the refractive index range of the third lens L3 is regulated, the lens length is shortened, and ultra-thinning is realized.
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 is defined as R4, and the following relational expression is satisfied: 4.00 ≦ (R3+ R4)/(R3-R4) ≦ 20.00, defines the shape of the second lens L2, and contributes to improvement of optical system performance within the conditional expression.
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, and the following relational expressions are satisfied: -10.00 ≦ (R9+ R10)/(R9-R10) ≦ -3.00, and defines the shape of the fifth lens L5, which can effectively correct aberrations generated by the first four lenses of the optical system.
Defining the focal length of the first lens as f1, satisfying the following relation: f1/f is more than or equal to 0.49 and less than or equal to 1.65, and the ratio of the positive refractive power to the overall focal length of the first lens element L1 is defined. When the refractive power of the first lens element L1 is within the predetermined range, the positive refractive power is suitable for reducing the system aberration, and the lens is suitable for ultra-thinning and wide-angle.
The curvature radius of the object side surface of the first lens L1 is defined as R1, the curvature radius of the image side surface of the first lens L1 is defined as R2, and the following relational expressions are satisfied: -5.32 ≦ (R1+ R2)/(R1-R2) ≦ -1.26, the shape of the first lens L1 is controlled appropriately so that the first lens L1 can correct the system spherical aberration effectively.
Defining the on-axis thickness of the first lens L1 as d1, the total optical length of the image pickup optical lens as TTL, and satisfying the following relation: d1/TTL is more than or equal to 0.08 and less than or equal to 0.29, and ultra-thinning is facilitated.
Defining the focal length of the second lens L2 as f2, the following relation is satisfied: -30.33 ≦ f2/f ≦ -2.57, which is advantageous for correcting aberrations of the optical system by controlling the negative power of the second lens L2 in a reasonable range.
Defining the on-axis thickness of the second lens L2 as d3, the total optical length of the image pickup optical lens as TTL, and satisfying the following relation: d3/TTL is more than or equal to 0.02 and less than or equal to 0.07, and ultra-thinning is facilitated.
The focal length of the third lens L3 is defined as f3, and the following relation is satisfied: f3/f is more than or equal to 0.90 and less than or equal to 2.93, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power.
The curvature radius of the object side surface of the third lens L3 is defined as R5, the curvature radius of the image side surface of the third lens L3 is defined as R6, and the following relational expressions are satisfied: the shape of the third lens is more than or equal to 0.27 and less than or equal to (R5+ R6)/(R5-R6) and less than or equal to 4.25, and the deflection degree of the light rays passing through the lens can be alleviated within the range specified by the conditional expression, so that the aberration can be effectively reduced.
Defining the on-axis thickness of the third lens L3 as d5, the total optical length of the image pickup optical lens as TTL, and satisfying the following relation: d5/TTL is more than or equal to 0.03 and less than or equal to 0.12, and ultra-thinning is facilitated.
The focal length of the fourth lens L4 is defined as f4, and the following relation is satisfied: 4.93 ≦ f4/f ≦ -0.91, specifying the ratio of the focal length of the fourth lens to the focal length of the system, which contributes to the improvement of the optical system performance within the conditional range.
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, and the following relational expressions are satisfied: -7.82 ≦ (R7+ R8)/(R7-R8) ≦ 0.03, and the shape of the fourth lens L4 is defined to be advantageous for correcting the aberration of the off-axis angle and the like with the development of an ultra-thin and wide-angle within the range.
Defining the on-axis thickness of the fourth lens L4 as d7, the total optical length of the image pickup optical lens as TTL, and satisfying the following relation: d7/TTL is more than or equal to 0.03 and less than or equal to 0.09, and ultra-thinning is facilitated.
Defining the on-axis thickness of the fifth lens L5 as d9, the total optical length of the image pickup optical lens as TTL, and satisfying the following relation: d9/TTL is more than or equal to 0.04 and less than or equal to 0.21, and ultra-thinning is facilitated.
The focal length of the sixth lens L6 is defined as f6, and the following relation is satisfied: 8.50 ≦ f6/f ≦ -0.99, and the system has better imaging quality and lower sensitivity through reasonable distribution of power within the conditional range.
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, and the following relations are satisfied: 1.26 ≦ (R11+ R12)/(R11-R12) ≦ 9.04, and the shape of the sixth lens L6 is specified, and when the conditions are within the range, it is advantageous to correct the problems such as off-axis aberration and the like as the ultra-thin wide angle is developed.
Defining the on-axis thickness of the sixth lens L6 as d11, the total optical length of the image pickup optical lens as TTL, and satisfying the following relation: d11/TTL is more than or equal to 0.05 and less than or equal to 0.20, and ultra-thinning is facilitated.
In this embodiment, the total optical length of the image pickup optical lens is TTL, the image height of the image pickup optical lens is IH, and the following relationship is satisfied: TTL/IH is less than or equal to 1.45, and ultra-thinning is facilitated.
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.
In this embodiment, the imaging optical lens has a focus number FNO and satisfies the following relationship: FNO is less than or equal to 1.70, which is beneficial to realizing large aperture and ensures good imaging performance.
Preferably, the field angle of the imaging optical lens is FOV, and the following relation is satisfied: the FOV is more than or equal to 79.00, which is beneficial to realizing wide angle.
When the above relationship is satisfied, the imaging optical lens 10 has good optical imaging performance, and can satisfy design requirements of large aperture and ultra-thinness; in accordance with the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are configured by image pickup devices such as a high-pixel CCD and a CMOS.
The image pickup optical lens 10 of the present invention will be explained below by way of example. The symbols described in the respective examples are as follows. The unit of focal length, on-axis distance, curvature radius, on-axis thickness, position of reverse curvature and position of stagnation point is mm.
TTL: the total optical length (on-axis distance from the object side surface of the first lens L1 to the image plane) in units of mm;
preferably, the object side surface and/or the image side surface of the lens may be further provided with an inflection point and/or a stagnation point to meet the requirement of high-quality imaging.
Tables 1 and 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 1 ]
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.
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 ]
| Number of points of inflection | Position of |
Position of reverse curvature 2 | Position of reverse curvature 3 | Position of reverse curve 4 | |
| |
1 | 1.265 | 0 | 0 | 0 |
| |
1 | 0.515 | 0 | 0 | 0 |
| P2R1 | 2 | 0.445 | 0.615 | 0 | 0 |
| |
0 | 0 | 0 | 0 | 0 |
| |
1 | 0.235 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 | 0 |
| P4R1 | 2 | 0.915 | 1.155 | 0 | 0 |
| P4R2 | 4 | 0.895 | 1.455 | 1.655 | 1.665 |
| P5R1 | 2 | 0.495 | 1.805 | 0 | 0 |
| P5R2 | 2 | 0.585 | 2.485 | 0 | 0 |
| P6R1 | 3 | 0.325 | 1.765 | 3.015 | 0 |
| P6R2 | 3 | 0.535 | 2.775 | 3.175 | 0 |
[ TABLE 4 ]
Fig. 2 shows a schematic diagram of axial aberrations of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm after passing through the imaging optical lens 10 according to the first embodiment, and fig. 3 shows a schematic diagram of chromatic aberration of magnification of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm after 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 corresponding to the parameters defined in the conditional expressions for the numerical values in the first, second, and third embodiments.
As shown in table 13, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter of 2.802mm, a full field height of 3.930mm, and a diagonal field angle of 79.52 °, and has excellent optical characteristics, with a wide angle and a slim profile, and with on-axis and off-axis chromatic aberration sufficiently corrected.
(second embodiment)
The second embodiment is basically the same as the first embodiment, and the reference numerals are the same as those in the first embodiment, and the configuration of the image pickup optical lens 20 of the second embodiment is shown in fig. 5, and only the differences will be described below.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
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 |
Position of reverse curvature 2 | Position of reverse curvature 3 | Position of reverse curve 4 | |
| |
1 | 1.315 | 0 | 0 | 0 |
| |
1 | 0.435 | 0 | 0 | 0 |
| P2R1 | 2 | 0.365 | 0.535 | 0 | 0 |
| |
0 | 0 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 | 0 |
| |
1 | 1.105 | 0 | 0 | 0 |
| |
1 | 0.825 | 0 | 0 | 0 |
| P4R2 | 2 | 0.855 | 1.405 | 0 | 0 |
| P5R1 | 2 | 0.835 | 2.095 | 0 | 0 |
| P5R2 | 2 | 0.925 | 2.405 | 0 | 0 |
| P6R1 | 3 | 0.325 | 1.725 | 2.955 | 0 |
| P6R2 | 3 | 0.585 | 2.705 | 3.145 | 0 |
[ TABLE 8 ]
| Number of stagnation points | Location of |
Location of stagnation 2 | |
| |
0 | 0 | 0 |
| |
1 | 0.955 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
1 | 1.485 | 0 |
| |
1 | 1.535 | 0 |
| P6R1 | 2 | 0.585 | 2.655 |
| |
1 | 1.285 | 0 |
Fig. 6 shows a schematic diagram of axial aberrations of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm passing through the imaging optical lens 20 according to the second embodiment, and fig. 7 shows a schematic diagram of chromatic aberration of magnification of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm 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 20 has an entrance pupil diameter of 2.806mm, a full field height of 3.930mm, and a diagonal field angle of 79.50 °, and has excellent optical characteristics, with a wide angle and a slim profile, and with a sufficient correction of on-axis and off-axis chromatic aberration.
(third embodiment)
The third embodiment is basically the same as the first embodiment, and the reference numerals are the same as those in the first embodiment, and the configuration of the imaging optical lens 30 of the third embodiment is shown in fig. 9, and only the differences will be described below.
Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
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 |
Location of stagnation 2 | |
| |
0 | 0 | 0 |
| |
1 | 1.155 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
1 | 0.405 | 0 |
| |
1 | 1.385 | 0 |
| |
1 | 1.085 | 0 |
| P6R1 | 2 | 0.705 | 2.895 |
| |
1 | 1.245 | 0 |
Fig. 10 shows a schematic diagram of axial aberrations of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm passing through the imaging optical lens 30 according to the third embodiment, and fig. 11 shows a schematic diagram of chromatic aberration of magnification of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm 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 30 has an entrance pupil diameter of 2.806mm, a full field image height of 3.930mm, and a diagonal field angle of 79.60 °, and has excellent optical characteristics with a wide angle and a slim size, and with a sufficient correction of on-axis and off-axis chromatic aberration.
[ TABLE 13 ]
| Parameter and condition formula | Example 1 | Example 2 | Example 3 |
| f | 4.623 | 4.630 | 4.630 |
| f1 | 4.619 | 4.513 | 5.106 |
| f2 | -17.789 | -19.464 | -70.210 |
| f3 | 8.811 | 9.043 | 8.370 |
| f4 | -11.386 | -6.353 | -6.688 |
| f5 | 20.389 | 7.659 | 23.011 |
| f6 | -7.497 | -6.876 | -19.688 |
| f12 | 5.618 | 5.391 | 5.276 |
| Fno | 1.65 | 1.65 | 1.65 |
| f5/f | 4.41 | 1.65 | 4.97 |
| n3 | 1.76 | 1.85 | 2.01 |
| d1/d3 | 3.6 | 5.00 | 4.5 |
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 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 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 convex surface at the paraxial position, and the image side surface of the first lens is a concave surface at the paraxial position; the object side surface of the second lens is a convex surface at the paraxial position, and the image side surface of the second lens is a concave surface at the paraxial position; the image side surface of the third lens is convex at the paraxial position; the object side surface of the fourth lens is a concave surface at the paraxial part; the object side surface of the fifth lens is a convex surface at the paraxial position, and the image side surface of the fifth lens is a concave surface at the paraxial position; the object side surface of the sixth lens is a convex surface at the paraxial region, and the image side surface of the sixth lens is a concave surface at the paraxial region;
the focal length of the whole imaging optical lens is f, the focal length of the fifth lens is f5, the on-axis thickness of the first lens is d1, the on-axis thickness of the second lens is d3, and the refractive index of the third lens is n3, so that the following relational expressions are satisfied:
1.50≤f5/f≤5.00；
3.50≤d1/d3≤5.00；
1.70≤n3≤2.10。
2. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, and the following relationship is satisfied:
4.00≤(R3+R4)/(R3-R4)≤20.00。
3. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the fifth lens is R9, the radius of curvature of the image-side surface of the fifth lens is R10, and the following relationship is satisfied:
-10.00≤(R9+R10)/(R9-R10)≤-3.00。
4. the image-capturing optical lens unit according to claim 1, wherein the first lens element has a focal length f1, a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, and the image-capturing optical lens unit has a total optical length TTL satisfying the following relationships:
0.49≤f1/f≤1.65；
-5.32≤(R1+R2)/(R1-R2)≤-1.26；
0.08≤d1/TTL≤0.29。
5. a camera optical lens according to claim 1, wherein the focal length of the second lens element is f2, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:
-30.33≤f2/f≤-2.57；
0.02≤d3/TTL≤0.07。
6. the imaging optical lens of claim 1, wherein 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, the on-axis thickness of the third lens is d5, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
0.90≤f3/f≤2.93；
0.27≤(R5+R6)/(R5-R6)≤4.25；
0.03≤d5/TTL≤0.12。
7. 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:
-4.93≤f4/f≤-0.91；
-7.82≤(R7+R8)/(R7-R8)≤0.03；
0.03≤d7/TTL≤0.09。
8. a photographic optical lens according to claim 1, characterized in that the on-axis thickness of the fifth lens element is d9, the total optical length of the photographic optical lens is TTL, and the following relation is satisfied:
0.04≤d9/TTL≤0.21。
9. 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:
-8.50≤f6/f≤-0.99；
1.26≤(R11+R12)/(R11-R12)≤9.04；
0.05≤d11/TTL≤0.20。
10. the imaging optical lens according to claim 1, wherein an optical total length of the imaging optical lens is TTL, an image height of the imaging optical lens is IH, a focal number of the imaging optical lens is FNO, and the following relationship is satisfied:
TTL/IH≤1.45；
FNO≤1.70。
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