CN110297313B - Image pickup optical lens - Google Patents

Image pickup optical lens Download PDF

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CN110297313B
CN110297313B CN201910581576.4A CN201910581576A CN110297313B CN 110297313 B CN110297313 B CN 110297313B CN 201910581576 A CN201910581576 A CN 201910581576A CN 110297313 B CN110297313 B CN 110297313B
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lens
imaging optical
curvature
optical lens
radius
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CN110297313A (en
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言俊杰
孙雯
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AAC Technologies Pte Ltd
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AAC Technologies Pte Ltd
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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
    • 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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Abstract

The invention provides a photographic optical lens, which comprises the following components in sequence 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 refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power; the on-axis thickness of the first lens is d1, the total optical length of the imaging optical lens is TTL, the Abbe number of the first lens is v1, the Abbe number of the fifth lens is v5, the radius of curvature of the object-side surface of the fourth lens is R7, and the radius of curvature of the image-side surface of the fourth lens is R8, so that the following relational expression is satisfied: d1/TTL is more than or equal to 0.20 and less than or equal to 0.40; v1/v5 is more than or equal to 2.50 and less than or equal to 4.00; -1.00 ≤ (R7+ R8)/(R7-R8) 1.00. The shooting optical lens has good optical performance, and simultaneously meets the design requirements of large aperture, wide angle and ultra-thinness, and the first lens has large thickness and can design structural characteristics on the lens.

Description

Image pickup optical lens
[ 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 ]
With the development of imaging technology, imaging optical lenses are widely used in various electronic products, such as smart phones and digital cameras. In order to be portable, people are increasingly pursuing the lightness and thinness of electronic products, and therefore, the small-sized image pickup optical lens with good imaging quality is the mainstream of the current market.
The imaging optical lens on the traditional electronic product adopts four-piece, five-piece, six-piece or even seven-piece lens structures, however, with the increase of diversified demands of users, however, with the development of technology and the increase of diversified demands of users, the pixel area of the photosensitive device is continuously reduced, and the requirement of the system on the imaging quality is continuously improved, the five-piece lens structure gradually appears in the lens design, although the common five-piece lens has better optical performance, the focal power, the lens interval and the lens shape still have certain irrationality, so that the lens structure can not meet the design requirements of large aperture, ultra-thinning and wide-angle while having good optical performance.
Therefore, it is necessary to provide an imaging optical lens having excellent optical performance and satisfying the design requirements of large aperture, wide angle and thinness.
[ summary of the invention ]
The invention aims to provide an imaging optical lens which has good optical performance, meets the design requirements of large aperture, ultra-thinning and wide-angle, has large thickness of a first lens and can design structural characteristics on a lens.
The technical scheme of the invention is as follows:
to solve the above technical problem, an embodiment of the present invention provides an imaging optical lens, which includes, 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 refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power;
the on-axis thickness of the first lens is d1, the total optical length of the imaging optical lens is TTL, the Abbe number of the first lens is v1, the Abbe number of the fifth lens is v5, the radius of curvature of the object-side surface of the fourth lens is R7, and the radius of curvature of the image-side surface of the fourth lens is R8, so that the following relational expression is satisfied:
0.20≤d1/TTL≤0.40；
2.50≤v1/v5≤4.00；
-1.00≤(R7+R8)/(R7-R8)≤1.00。
preferably, the on-axis thickness of the third lens is d5, and the on-axis distance from the image-side surface of the third lens to the object-side surface of the fourth lens is d 6; the following relation is satisfied:
1.40≤d6/d5≤3.00。
preferably, the focal length of the entire imaging optical lens is f, and the focal length of the first lens is f1, and the following relational expression is satisfied:
0.70≤f1/f≤1.30。
preferably, 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 following relationship is satisfied:
-2.30≤(R1+R2)/(R1-R2)≤-0.16。
preferably, the focal length of the entire imaging optical lens is f, the focal length of the second lens is f2, 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 on-axis thickness of the second lens is d3, and the following relationships are satisfied:
-59.62≤f2/f≤-1.37；
-45.68≤(R3+R4)/(R3-R4)≤32.53；
0.02≤d3/TTL≤0.08。
preferably, the focal length of the entire imaging optical lens is f, 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, and the following relationships are satisfied:
-11.63≤f3/f≤12.90；
-1114.00≤(R5+R6)/(R5-R6)≤14.67；
0.02≤d5/TTL≤0.09。
preferably, the focal length of the fourth lens element is f4, the focal length of the entire imaging optical lens is f, the on-axis thickness of the fourth lens element is d7, and the following relationship is satisfied:
0.31≤f4/f≤5.91；
0.04≤d7/TTL≤0.30。
preferably, the focal length of the fifth lens element is f5, the focal length of the entire imaging optical lens is f, 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 on-axis thickness of the fifth lens element is d9, and the following relationships are satisfied:
-1.85≤f5/f≤-0.29；
0.44≤(R9+R10)/(R9-R10)≤5.89；
0.03≤d9/TTL≤0.16。
preferably, the image height of the imaging optical lens is IH, and the following relation is satisfied:
TTL/IH≤1.70。
preferably, the field angle of the imaging optical lens is FOV, the focal number of the imaging optical lens is Fno, and the following relation is satisfied:
FOV≥75；
Fno≤2.20。
the invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, is extremely thin, has a wide angle, and sufficiently corrects chromatic aberration, and is particularly suitable for a mobile phone imaging lens unit and a WEB imaging lens which are configured by an imaging element such as a CCD or a CMOS for high pixel.
[ description of the drawings ]
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;
fig. 13 is a schematic configuration diagram of an imaging optical lens according to a fourth embodiment;
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;
fig. 17 is a schematic configuration diagram of an imaging optical lens of a fifth embodiment;
fig. 18 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 17;
fig. 19 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 17;
fig. 20 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 17.
[ detailed description ] embodiments
The invention is further described with reference to the following figures and 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.
The following is an embodiment one:
referring to fig. 1 to 4, an imaging optical lens 10 according to a first embodiment of the present invention is provided. In fig. 1, the left side is an object side, the right side is an image side, and the imaging optical lens assembly 10 mainly includes five lens elements coaxially disposed, and includes, in order from the object side to the image side, an aperture stop S1, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with refractive power, a fourth lens element L4 with positive refractive power, and a fifth lens element L5 with negative refractive power. A stop S1 is further disposed on the object-side surface of the first lens L1, and a glass plate GF is disposed between the fifth lens L5 and the image plane Si, where the glass plate GF may be a glass cover plate or an optical filter.
Defining the on-axis thickness of the first lens as d1, and 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 0.20 and less than or equal to 0.40, the ratio of the on-axis thickness of the first lens to the total optical length of the shooting optical lens is specified, and the first lens in the range is convenient for structural design and is beneficial to system assembly.
The abbe number of the first lens L1 is defined as v1, and the abbe number of the fifth lens L5 is defined as v5, and the following relations are satisfied: 2.50-v 1/v 5-4.00, the ratio of the Abbe number of the first lens L1 to the Abbe number of the fifth lens L5 is specified, and the system meeting the conditions can effectively correct chromatic aberration.
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: 1.00 ≦ (R7+ R8)/(R7-R8) ≦ 1.00, and defines the shape of the fourth lens L4, within the range defined by the conditional expression, the degree of deflection of the light rays passing through the lens can be alleviated, and the aberration can be effectively reduced.
In the present embodiment, the on-axis thickness of the third lens L3 is d5, and the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4 is d 6; the following relation is satisfied: 1.40 < d6/d5 < 3.00, and the ratio of the air space distance between the third lens L3 and the fourth lens L4 to the thickness of the third lens L3 is defined, which is beneficial to the processing of the lens and the assembly of the lens in the conditional expression range.
In the present embodiment, the focal length of the entire imaging optical lens is f, and the focal length of the first lens L1 is f1, and the following relational expression is satisfied: f1/f is more than or equal to 0.70 and less than or equal to 1.30, and when f1/f meets the condition, the focal power of the first lens L1 can be effectively distributed to correct the aberration of the optical system, so that the imaging quality is improved.
When the focal length of the image pickup optical lens 10, the focal lengths of the respective lenses, the refractive indices of the respective lenses, the optical total length of the image pickup optical lens, the on-axis thickness, and the curvature radius satisfy the above-described relational expressions, the image pickup optical lens 10 can have high performance and meet the design requirement of low TTL.
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, and the following relational expression is satisfied: -2.30 ≦ (R1+ R2)/(R1-R2) ≦ -0.16, the shape of the first lens L1 is controlled appropriately so that the first lens L1 can correct the system spherical aberration effectively.
The focal length of the second lens is f2, and the following relation is satisfied: -59.62 ≦ f 2/f ≦ -1.37, which is advantageous for correcting aberrations of the optical system by controlling the negative power of the second lens L2 in a reasonable range.
The curvature radius of the lens 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, and the following relational expression is satisfied: 45.68 is less than or equal to (R3+ R4)/(R3-R4) is less than or equal to 32.53. The shape of the second lens L2 is defined, and when the lens is within the range, the problem of chromatic aberration on the axis can be corrected favorably as the lens becomes thinner and wider.
Defining the total optical length of the image pickup optical lens as TTL, the on-axis thickness of the second lens L2 as d3, and satisfying the following relational expression: d3/TTL is more than or equal to 0.02 and less than or equal to 0.08, and ultra-thinning is facilitated.
The focal length of the third lens L3 is f3, and the following relation is satisfied: 11.63 ≦ f3/f ≦ 12.90, which allows better imaging quality and lower sensitivity of the system through reasonable distribution of the powers.
The focal length of the third lens L3 is f3, the radius of curvature of the object-side surface of the third lens L3 is R5, and the radius of curvature of the image-side surface of the third lens L3 is R6, which satisfy the following relations: -1114.00 ≦ (R5+ R6)/(R5-R6) ≦ 14.67, which can effectively control the shape of the third lens L3, facilitate the molding of the third lens L3, and avoid the molding failure and stress generation caused by the excessive surface curvature of the third lens L3.
Defining the total optical length of the image pickup optical lens as TTL, the on-axis thickness of the third lens L3 as d5, and satisfying the following relational expression: d5/TTL is more than or equal to 0.02 and less than or equal to 0.09, and ultra-thinning is facilitated.
The focal length of the fourth lens L4 is f4, and the following relation is satisfied: f4/f is more than or equal to 0.31 and less than or equal to 5.91, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power.
The on-axis thickness of the fourth lens L4 is d7, and the following relation is satisfied: d7/TTL is more than or equal to 0.04 and less than or equal to 0.30, and ultra-thinning is facilitated.
The focal length of the fifth lens L5 is f5, and the following relation is satisfied: f5/f is less than or equal to 1.85 and less than or equal to-0.29, and the definition of the fifth lens L5 can effectively make the light angle of the camera lens smooth and reduce the tolerance sensitivity.
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 is R10, and the following relational expression is satisfied: the (R9+ R10)/(R9-R10) is 0.44 or more and 5.89 or less, and the shape of the fifth lens L5 is defined, and when the shape is within the condition range, the problem of aberration of off-axis picture angle is favorably corrected along with the development of ultra-thin wide-angle.
The on-axis thickness of the fifth lens L5 is d9, and the following relation is satisfied: d9/TTL is more than or equal to 0.03 and less than or equal to 0.16, 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 1.70, 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 the present embodiment, the angle of view of the imaging optical lens in the diagonal direction is FOV, and satisfies the following relational expression: the FOV is more than or equal to 75, which is beneficial to realizing wide angle.
In the present embodiment, the focal number of the imaging optical lens is Fno, and the following relationship is satisfied: fno is less than or equal to 2.20, which is beneficial to realizing large aperture and ensures good imaging performance.
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.
In addition, in the imaging optical lens 10 provided in the present embodiment, the surface of each lens can be an aspheric surface, which is easy to be made into a shape other than a spherical surface, so as to obtain more control variables for reducing the aberration and further reducing the number of lenses used, thereby effectively reducing the total length of the imaging optical lens 10. In the present embodiment, both the object-side surface and the image-side surface of each lens are aspheric.
It is to be noted that since the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 have the structural and parameter relationships as described above, the image-taking optical lens 10 can reasonably distribute the powers, intervals, and shapes of the respective lenses, and thus correct various types of aberrations.
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 (total optical length) (axial distance from the object side surface of the 1 st lens L1 to the image plane) 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 ]
Figure BDA0002113301050000081
The meanings of the symbols in the above table are as follows.
R: the radius of curvature of the optical surface is the central radius of curvature in the case of a lens;
s1: an aperture;
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 radius of curvature of object side of glass plate GF;
r12 radius of curvature of image side of glass plate GF;
d: the on-axis thickness of each lens or the on-axis distance between two adjacent lenses;
d0 on-axis distance from 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: the on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the glass plate GF;
d 11: on-axis thickness of glass flat GF;
d 12: the axial distance from the image side surface of the glass flat GF to the image surface Si;
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;
ndg: refractive index of d-line of glass flat GF;
vd is 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;
vg: abbe number of glass sheet GF.
[ TABLE 2 ]
Figure BDA0002113301050000101
In table 2, k is a conic coefficient, and a4, a6, A8, a10, a12, a14, a16, a18, a20 are aspherical 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, and P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, respectively. The "inflection point position" field correspondence data is a vertical distance from an inflection point set on each lens surface to the optical axis of the image pickup optical lens 10. The "stagnation point position" field corresponding data is the vertical distance from the stagnation point set on each lens surface to the optical axis of the imaging optical lens 10.
[ TABLE 3 ]
Number of points of inflection Position of reverse curvature 1 Position of reverse curvature 2 Position of reverse curvature 3 Position of reverse curve 4 Position of reverse curve 5
P1R1 1 0.835 0 0 0 0
P1R2 0 0 0 0 0 0
P2R1 3 0.085 0.205 0.545 0 0
P2R2 0 0 0 0 0 0
P3R1 1 0.825 0 0 0 0
P3R2 1 0.915 0 0 0 0
P4R1 2 0.885 1.615 0 0 0
P4R2 5 0.525 1.025 1.805 1.865 1.955
P5R1 2 1.395 2.355 0 0 0
P5R2 3 0.435 2.195 2.525 0 0
[ TABLE 4 ]
Number of stagnation points Location of stagnation 1 Location of stagnation 2 Location of stagnation 3
P1R1 0 0 0 0
P1R2 0 0 0 0
P2R1 3 0.155 0.245 0.695
P2R2 0 0 0 0
P3R1 1 1.155 0 0
P3R2 1 1.405 0 0
P4R1 1 1.165 0 0
P4R2 0 0 0 0
P5R1 1 2.115 0 0
P5R2 1 1.165 0 0
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm 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 21 shown later shows values corresponding to the parameters defined in the conditional expressions, for each of the numerical values in the first, second, third, fourth, and fifth embodiments.
As shown in table 21, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter ENPD of 1.701mm, a full-field image height IH of 3.282mm, and a diagonal field angle FOV of 80.00 °, and thus has a large aperture, a slim size, and a wide angle, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
The following is embodiment two:
fig. 5 is a schematic structural diagram of the image pickup optical lens 20 in the second embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the description of the same parts is omitted here, and only different points are listed below.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
Figure BDA0002113301050000121
[ TABLE 6 ]
Figure BDA0002113301050000131
[ TABLE 7 ]
Number of points of inflection Position of reverse curvature 1 Position of reverse curvature 2 Position of reverse curvature 3 Position of reverse curve 4 Position of reverse curve 5
P1R1 0 0 0 0 0 0
P1R2 0 0 0 0 0 0
P2R1 2 0.155 0.525 0 0 0
P2R2 0 0 0 0 0 0
P3R1 1 0.725 0 0 0 0
P3R2 1 0.845 0 0 0 0
P4R1 1 0.505 0 0 0 0
P4R2 4 0.735 1.155 1.645 1.725 0
P5R1 5 0.195 0.905 1.425 1.675 2.095
P5R2 3 0.365 2.085 2.205 0 0
[ TABLE 8 ]
Figure BDA0002113301050000132
Figure BDA0002113301050000141
Table 21 below also lists values corresponding to various parameters in embodiment two and parameters specified in the conditional expressions.
Fig. 6 and 7 show schematic diagrams of axial aberration and chromatic aberration of magnification of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm passing through the imaging optical lens 20, respectively. Fig. 8 is a schematic view showing the curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 20. The field curvature S in fig. 8 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.
In the present embodiment, the imaging optical lens 20 has an entrance pupil diameter ENPD of 1.488mm, a full-field image height IH of 2.590mm, and a diagonal field angle FOV of 75.00 °, and thus has a large aperture, a slim size, and a wide angle, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
The following is the third embodiment:
fig. 9 is a schematic structural diagram of an imaging optical lens 30 in the third embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the description of the same parts is omitted here, and only different points are listed below.
Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
Figure BDA0002113301050000142
Figure BDA0002113301050000151
[ TABLE 10 ]
Figure BDA0002113301050000152
Tables 11 and 12 show the inflected point and stagnation point design data of each lens in the imaging optical lens 30.
[ TABLE 11 ]
Figure BDA0002113301050000153
Figure BDA0002113301050000161
[ TABLE 12 ]
Number of stagnation points Location of stagnation 1
P1R1 0 0
P1R2 0 0
P2R1 1 0.815
P2R2 1 0.555
P3R1 1 0.955
P3R2 1 1.305
P4R1 1 0.755
P4R2 0 0
P5R1 1 2.285
P5R2 1 1.205
Table 21 below also lists values corresponding to various parameters in the third embodiment and the parameters specified in the conditional expressions.
Fig. 10 and 11 show schematic diagrams of axial aberration and chromatic aberration of magnification of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm passing through the imaging optical lens 30, respectively. Fig. 12 is a schematic view showing the curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 30. The field curvature S in fig. 12 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.
In the present embodiment, the imaging optical lens 30 has an entrance pupil diameter ENPD of 1.718mm, a full-field height IH of 3.282mm, and a diagonal field angle FOV of 79.80 °, and thus has a large aperture, a slim size, and a wide angle, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
The following is embodiment four:
fig. 13 is a schematic structural diagram of an image pickup optical lens 40 in a fourth embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the same parts are not repeated herein, and only different points are listed below.
Tables 13 and 14 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 13 ]
Figure BDA0002113301050000171
[ TABLE 14 ]
Figure BDA0002113301050000172
Tables 15 and 16 show the inflected point and stagnation point design data of each lens in the imaging optical lens 40.
[ TABLE 15 ]
Figure BDA0002113301050000181
[ TABLE 16 ]
Number of stagnation points Location of stagnation 1 Location of stagnation 2
P1R1 0 0 0
P1R2 1 0.435
P2R1 0 0 0
P2R2 1 0.925 0
P3R1 1 1.015 0
P3R2 1 1.115 0
P4R1 1 0.825 0
P4R2 2 0.245 1.375
P5R1 1 0.855 0
P5R2 1 1.165 0
Table 21 below also lists values corresponding to various parameters in the fourth embodiment and the parameters specified in the conditional expressions.
Fig. 14 and 15 show schematic diagrams of axial aberration and chromatic aberration of magnification of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm passing through the imaging optical lens 40, respectively. Fig. 16 is a schematic view showing the curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 40. The field curvature S in fig. 16 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.
In the present embodiment, the imaging optical lens 40 has an entrance pupil diameter ENPD of 1.695mm, a full-field image height IH of 2.954mm, and a diagonal field angle FOV of 75.00 °, and thus has a large aperture, a slim size, and a wide angle, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
The following is embodiment five:
fig. 17 is a schematic structural diagram of an image pickup optical lens 50 according to a fifth embodiment, which is substantially the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the description of the same parts is omitted here, and only different points are listed below.
Tables 17 and 18 show design data of the imaging optical lens 50 according to the fifth embodiment of the present invention.
[ TABLE 17 ]
Figure BDA0002113301050000191
[ TABLE 18 ]
Figure BDA0002113301050000192
Figure BDA0002113301050000201
Tables 19 and 20 show the inflected point and stagnation point design data of each lens in the imaging optical lens 50.
[ TABLE 19 ]
Number of points of inflection Position of reverse curvature 1 Position of reverse curvature 2 Position of reverse curvature 3 Position of reverse curve 4
P1R1 1 0.775 0 0 0
P1R2 0 0 0 0 0
P2R1 2 0.155 0.585 0 0
P2R2 0 0 0 0 0
P3R1 1 0.835 0 0 0
P3R2 1 0.895 0 0 0
P4R1 2 0.665 1.615 0 0
P4R2 4 0.065 0.555 1.775 1.935
P5R1 3 0.305 1.385 2.255 0
P5R2 3 0.405 2.415 2.435 0
[ TABLE 20 ]
Figure BDA0002113301050000202
Figure BDA0002113301050000211
Table 21 below also lists values corresponding to various parameters in the fifth embodiment and the parameters specified in the conditional expressions.
Fig. 18 and 19 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 435nm, 486nm, 546nm, 587nm, and 656nm passing through the imaging optical lens 50, respectively. Fig. 20 is a schematic view showing the curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 50. The field curvature S in fig. 20 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.
In the present embodiment, the imaging optical lens 50 has an entrance pupil diameter ENPD of 1.718mm, a full-field image height IH of 3.282mm, and a diagonal field angle FOV of 79.60 °, and thus has a large aperture, a slim size, and a wide angle, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
The following table 21 is based on the above values and values of other relevant parameters.
[ TABLE 21 ]
Parameter and condition formula Example 1 Example 2 Example 3 Example 4 Example 5
f 3.743 3.273 3.780 3.730 3.780
f1 3.598 2.936 2.697 3.777 4.730
f2 -9.956 -29.477 -7.749 -111.185 -112.643
f3 32.195 -7.319 -21.990 22.878 32.000
f4 3.103 2.983 2.348 14.687 8.373
f5 -2.010 -2.212 -1.639 -3.385 -3.488
f12 4.952 3.149 3.828 3.926 4.813
Fno 2.20 2.20 2.20 2.20 2.20
d1/TTL 0.30 0.33 0.20 0.38 0.28
v1/v5 2.53 3.64 3.15 3.98 2.72
(R7+R8)/(R7-R8) 0.55 -0.16 0.97 0.82 -0.96
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims (9)

1. An imaging optical lens, comprising five lenses in total, the five lenses comprising, 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 refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power;
the on-axis thickness of the first lens is d1, the total optical length of the imaging optical lens is TTL, the abbe number of the first lens is v1, the abbe number of the fifth lens is v5, the radius of curvature of the object-side surface of the fourth lens is R7, the radius of curvature of the image-side surface of the fourth lens is R8, the focal length of the imaging optical lens as a whole is f, and the focal length of the first lens is f1, which satisfy the following relational expression:
0.20≤d1/TTL≤0.40；
2.50≤v1/v5≤4.00；
-1.00≤(R7+R8)/(R7-R8)≤1.00；
0.70≤f1/f≤1.30。
2. the imaging optical lens according to claim 1, wherein the on-axis thickness of the third lens is d5, and the on-axis distance from the image-side surface of the third lens to the object-side surface of the fourth lens is d 6; the following relation is satisfied:
1.40≤d6/d5≤3.00。
3. the imaging 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 following relationship is satisfied:
-2.30≤(R1+R2)/(R1-R2)≤-0.16。
4. the imaging optical lens according to claim 1, wherein a focal length of the entire imaging optical lens is f, a focal length of the second lens is 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 the following relationship is satisfied:
-59.62≤f 2/f≤-1.37；
-45.68≤(R3+R4)/(R3-R4)≤32.53；
0.02≤d3/TTL≤0.08。
5. the imaging optical lens according to claim 1, wherein a focal length of the entire imaging optical lens is f, a focal length of the third lens is 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 following relation is satisfied:
-11.63≤f3/f≤12.90；
-1114.00≤(R5+R6)/(R5-R6)≤14.67；
0.02≤d5/TTL≤0.09。
6. the imaging optical lens according to claim 1, wherein the focal length of the fourth lens element is f4, the focal length of the imaging optical lens as a whole is f, the on-axis thickness of the fourth lens element is d7, and the following relationship is satisfied:
0.31≤f4/f≤5.91；
0.04≤d7/TTL≤0.30。
7. the imaging optical lens according to claim 1, wherein the focal length of the fifth lens element is f5, the focal length of the imaging optical lens as a whole is f, 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 on-axis thickness of the fifth lens element is d9, and the following relationship is satisfied:
-1.85≤f5/f≤-0.29；
0.44≤(R9+R10)/(R9-R10)≤5.89；
0.03≤d9/TTL≤0.16。
8. an imaging optical lens according to claim 1, wherein the image height of the imaging optical lens is IH and satisfies the following relation: TTL/IH is less than or equal to 1.70.
9. The imaging optical lens according to claim 1, wherein an angle of view of the imaging optical lens is FOV, a focal number of the imaging optical lens is Fno, and the following relational expression is satisfied:
FOV≥75；
Fno≤2.20。
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