CN110398819B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN110398819B CN110398819B CN201910581775.5A CN201910581775A CN110398819B CN 110398819 B CN110398819 B CN 110398819B CN 201910581775 A CN201910581775 A CN 201910581775A CN 110398819 B CN110398819 B CN 110398819B
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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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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, and a fifth lens element; the curvature radius of the image side surface of the first lens is R2, the curvature radius of the object side surface of the first lens is R1, the focal length of the third lens is f3, the focal length of the whole imaging optical lens is f, the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, the on-axis thickness of the second lens is d3, and the refractive index of the fourth lens is n4, so that the following relational expression is satisfied: R2/R1 is more than or equal to-20.00 and less than or equal to-2.00; f3/f is more than or equal to 0.50 and less than or equal to 3.50; d4/d3 is more than or equal to 1.50 and less than or equal to 5.00; n4 is more than or equal to 1.69 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 a large aperture and a long focal length.
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, the five-piece lens structure gradually appears in the lens design, although the common five-piece lens has good optical performance, the long focal length, the focal power, the lens distance and the lens shape setting of the five-piece lens still have certain irrationality, so that the lens structure can not meet the design requirements of a large aperture and a long focal length while having 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 the design requirements of a large aperture and a long focal length.
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, and a fifth lens element; the curvature radius of the image side surface of the first lens is R2, the curvature radius of the object side surface of the first lens is R1, the focal length of the third lens is f3, the focal length of the whole imaging optical lens is f, the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, the on-axis thickness of the second lens is d3, and the refractive index of the fourth lens is n4, so that the following relational expression is satisfied:
-20.00≤R2/R1≤-2.00；
0.50≤f3/f≤3.50；
1.50≤d4/d3≤5.00；
1.69≤n4≤2.10。
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:
-4.10≤(R5+R6)/(R5-R6)≤0.10。
preferably, the focal length of the fourth lens is f4, and the following relation is satisfied:
-0.70≤f4/f≤-0.35。
preferably, the focal length of the first lens is f1, the on-axis thickness of the first lens is d1, the optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied:
0.19≤f1/f≤0.67；
-1.81≤(R1+R2)/(R1-R2)≤-0.24；
0.10≤d1/TTL≤0.36。
preferably, the focal length of the second lens element is f2, the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the image-side surface of the second lens element is R4, the optical length of the image pickup optical lens is TTL, and the following relationships are satisfied:
-1.22≤f2/f≤-0.33；
0.69≤(R3+R4)/(R3-R4)≤2.66；
0.02≤d3/TTL≤0.09。
preferably, the on-axis thickness of the third lens is d5, the optical length of the image pickup optical lens is TTL, and the following relation is satisfied:
0.03≤d5/TTL≤0.12。
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 optical length of the imaging optical lens system is TTL and satisfies the following relationship:
0.47≤(R7+R8)/(R7-R8)≤4.07；
0.02≤d7/TTL≤0.06。
preferably, the focal length of the fifth lens element is f5, the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, and the optical length of the image pickup optical lens is TTL and satisfies the following relation:
-16.97≤f5/f≤51.39；
-20.03≤(R9+R10)/(R9-R10)≤198.64；
0.05≤d9/TTL≤0.21。
preferably, the total optical length of the image pickup optical lens is TTL, and satisfies the following relation: f/TTL is more than or equal to 1.14.
Preferably, the focal number of the imaging optical lens is FNO, and the following relation is satisfied: FNO is less than or equal to 2.25.
The invention has the advantages that the pick-up optical lens has good optical performance, has the characteristics of large aperture and long focal length, and is particularly suitable for a mobile phone pick-up lens assembly and a WEB pick-up lens which are composed of pick-up elements such as CCD and CMOS for high pixel.
[ 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 five lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: a diaphragm S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. An optical element such as an optical filter (filter) GF may be disposed between the fifth lens L5 and the image plane Si.
In the present embodiment, the curvature radius of the image-side surface of the first lens L1 is defined as R2, and the curvature radius of the object-side surface of the first lens L1 is defined as R1, which satisfy the following relation: -20.00 ≦ R2/R1 ≦ -2.00, specifying a ratio of the radius of curvature of the image-side surface to the radius of curvature of the object-side surface of the first lens L1, which contributes to balancing the system spherical aberration over a range of conditions.
Defining the focal length of the third lens element L3 as f3, the focal length of the entire imaging optical lens as f, and satisfying the following relation: f3/f is 0.50-3.50, and the ratio of the focal length of the third lens L3 to the focal length of the entire image pickup optical lens is defined, which contributes to the improvement of the optical system performance in the conditional expression range.
Defining an on-axis distance d4 from an image-side surface of the second lens L2 to an object-side surface of the third lens L3, an on-axis thickness d3 of the second lens L2, the following relation is satisfied: 1.50 is not less than d4/d3 is not less than 5.00, when d4/d3 meets the condition, the processing of the lens and the assembly of the lens are facilitated in the condition formula range.
Defining the refractive index of the fourth lens L4 as n4, and satisfying the following relation: 1.69 is not less than n4 is not less than 2.10, the refractive index of the fourth lens L4 is regulated, the deflection degree of light rays passing through the lens can be alleviated within the range regulated by the conditional expression, and the aberration can be effectively reduced.
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: 4.10 ≦ (R5+ R6)/(R5-R6) ≦ 0.10, and defines the shape of the third lens L3, which can effectively correct aberrations generated by the front two lenses of the optical system.
Defining a focal length of the fourth lens element L4 as f4, and a focal length of the entire imaging optical lens as f, and satisfying the following relationships: f4/f is not less than 0.70 and not more than-0.35, when f4/f meets the condition, the focal length of the fourth lens L4 can be effectively distributed, the aberration of the optical system is corrected, and the imaging quality is improved.
Defining the focal length of the first lens L1 as f1, and the focal length of the entire imaging optical lens as f, the following relations are satisfied: f1/f is more than or equal to 0.19 and less than or equal to 0.67, 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 is defined as R1, the curvature radius of the image side surface of the first lens is defined as R2, and the following relational expression is satisfied: -1.81 ≦ (R1+ R2)/(R1-R2) ≦ -0.24, 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 total optical length of the image pickup optical lens as TTL, the on-axis thickness of the first lens L1 as d1, and satisfying the following relational expression: d1/TTL is more than or equal to 0.10 and less than or equal to 0.36, and ultra-thinning is facilitated.
Defining a focal length f of the entire imaging optical lens, and a focal length f2 of the second lens L2, the following relationships are satisfied: 1.22 ≦ f2/f ≦ -0.33, 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 object side surface of the second lens L2 is defined as R3, the curvature radius of the image side surface of the second lens L2 is defined as R4, and the following relational expressions are satisfied: the second lens L2 is defined to have a shape of 0.69 ≦ (R3+ R4)/(R3-R4) ≦ 2.66, and is advantageous for correcting the chromatic aberration on the axis as the lens is made to have a super-thin wide angle in the range.
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 0.09, and ultra-thinning is facilitated.
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 0.03 and less than or equal to 0.12, and ultra-thinning is facilitated.
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: the shape of the fourth lens L4 is defined to be not less than 0.47 (R7+ R8)/(R7-R8) and not more than 4.07, and when the shape is within a condition range, the problem such as aberration of off-axis picture angle is favorably corrected as the ultra-thin wide angle is developed.
Defining the total optical length of the image pickup optical lens as TTL, the on-axis thickness of the fourth lens L4 as d7, and satisfying the following relational expression: d7/TTL is more than or equal to 0.02 and less than or equal to 0.06, and ultra-thinning is facilitated.
Defining a focal length f5 of the fifth lens element L5, a focal length f of the entire imaging optical lens, and satisfying the following relationships: 16.97 ≦ f5/f ≦ 51.39, and the definition of the fifth lens L5 is effective to make the light angle of the camera lens gentle and reduce the tolerance sensitivity.
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: -20.03 ≦ (R9+ R10)/(R9-R10) ≦ 198.64, and it is specified that the shape of the fifth lens L5 is advantageous for correcting the off-axis aberration and the like as the ultra-thin wide angle progresses within the condition range.
Defining the total optical length of the image pickup optical lens as TTL, the on-axis thickness of the fifth lens L5 as d9, and satisfying the following relational expression: d9/TTL is more than or equal to 0.05 and less than or equal to 0.21, and ultra-thinning is facilitated.
In this embodiment, the focal length of the entire image pickup optical lens is f, the total optical length of the image pickup optical lens is TTL, and the following relationship is satisfied: f/TTL is more than or equal to 1.14, and the realization of long focal length is facilitated.
In this embodiment, the imaging optical lens has a focus number FNO and satisfies the following relationship: FNO is less than or equal to 2.25, 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 the design requirements of large aperture and long focal length; 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: radius of curvature of the object side of the optical filter GF;
r12: 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: the on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the optical filter GF;
d 11: on-axis thickness of the optical filter GF;
d 12: 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;
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;
vg: abbe number of the optical filter GF.
Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 2 ]
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14 and A16 are aspheric coefficients.
y＝(x2/R)/[1+{1-(k+1)(x2/R2)}1/2]+A4x4+A6x6+A8x8+A10x10+A12x12+A14x14+A16x16 (1)
For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).
Tables 3 and 4 show the inflection point and stagnation point design data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, 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 |
Position of reverse curvature 2 | |
| |
1 | 1.505 | 0 |
| |
0 | 0 | 0 |
| P2R1 | 2 | 0.185 | 1.015 |
| P2R2 | 2 | 0.615 | 0.805 |
| |
1 | 0.335 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
1 | 0.865 | 0 |
| |
1 | 1.385 | 0 |
| |
0 | 0 | 0 |
[ TABLE 4 ]
Fig. 2 shows a schematic diagram of axial aberrations of light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the imaging optical lens 10 of the first embodiment, and fig. 3 shows a schematic diagram of chromatic aberration of magnification of light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the imaging optical lens 10 of the first embodiment. Fig. 4 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 10 according to the first embodiment, where S is curvature of field in the sagittal direction and T is curvature of field in the tangential direction in fig. 4.
Table 13 shown later shows values corresponding to the parameters defined in the conditional expressions, for each of 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 3.117mm, a full field image height of 2.000mm, and a diagonal field angle of 32.00 °, 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.
(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 | |
| |
1 | 1.485 | 0 | 0 |
| |
0 | 0 | 0 | 0 |
| P2R1 | 2 | 0.205 | 1.215 | 0 |
| P2R2 | 3 | 0.525 | 1.105 | 1.235 |
| P3R1 | 2 | 0.295 | 1.025 | 0 |
| P3R2 | 2 | 0.115 | 1.025 | 0 |
| |
1 | 0.155 | 0 | 0 |
| P4R2 | 2 | 1.085 | 1.195 | 0 |
| |
1 | 1.245 | 0 | 0 |
| |
1 | 0.045 | 0 | 0 |
[ TABLE 8 ]
| Number of stagnation points | Location of |
|
| |
0 | 0 |
| |
0 | 0 |
| |
1 | 0.355 |
| |
0 | 0 |
| |
1 | 0.505 |
| |
1 | 0.195 |
| |
1 | 0.295 |
| |
0 | 0 |
| |
0 | 0 |
| |
1 | 0.075 |
Fig. 6 shows a schematic diagram of axial aberrations of light with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the imaging optical lens 20 of the second embodiment, and fig. 7 shows a schematic diagram of chromatic aberration of magnification of light with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the imaging optical lens 20 of the second embodiment. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm 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 3.117mm, a full field image height of 2.000mm, and a diagonal field angle of 32.00 °, 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.
(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 ]
| Number of points of inflection | Position of |
Position of reverse curvature 2 | Position of reverse curvature 3 | |
| |
1 | 1.465 | 0 | 0 |
| P1R2 | 2 | 0.605 | 1.115 | 0 |
| P2R1 | 2 | 0.235 | 0.845 | 0 |
| |
0 | 0 | 0 | 0 |
| |
1 | 0.515 | 0 | 0 |
| |
1 | 0.105 | 0 | 0 |
| P4R1 | 3 | 0.265 | 0.565 | 0.905 |
| |
1 | 0.935 | 0 | 0 |
| |
1 | 1.185 | 0 | 0 |
| |
1 | 1.685 | 0 | 0 |
[ TABLE 12 ]
Fig. 10 shows a schematic diagram of axial aberrations of light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the imaging optical lens 30 of the third embodiment, and fig. 11 shows a schematic diagram of chromatic aberration of magnification of light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the imaging optical lens 30 of the third embodiment. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm 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 3.103mm, a full field image height of 2.000mm, and a diagonal field angle of 32.00 °, 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 ]
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 (9)
1. 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, and a fifth lens element;
the radius of curvature of first lens image side face is R2, the radius of curvature of first lens object side face is R1, the focus of third lens is f3, the holistic focus of optical lens that makes a video recording is f, the image side of second lens arrives the distance is d4 on the axle of the object side of third lens, the on-axis thickness of second lens is d3, the refracting index of fourth lens is n4, the radius of curvature of second lens object side face is R3, the radius of curvature of second lens image side face is R4, the number of focuses of optical lens that makes a video recording is FNO, satisfies following relation:
-20.00≤R2/R1≤-2.00；
0.50≤f3/f≤3.50；
1.50≤d4/d3≤5.00；
1.69≤n4≤2.10；
0.69≤(R3+R4)/(R3-R4)≤2.66；
FNO≤2.25。
2. the imaging optical lens according to claim 1, wherein a radius of curvature of an object-side surface of the third lens is R5, a radius of curvature of an image-side surface of the third lens is R6, and the following relational expression is satisfied:
-4.10≤(R5+R6)/(R5-R6)≤0.10。
3. the imaging optical lens according to claim 1, wherein the fourth lens has a focal length f4 and satisfies the following relationship:
-0.70≤f4/f≤-0.35。
4. the image-taking optical lens according to claim 1, wherein the first lens has a focal length of f1, an on-axis thickness of d1, an optical length of TTL, and the following relationship is satisfied:
0.19≤f1/f≤0.67；
-1.81≤(R1+R2)/(R1-R2)≤-0.24；
0.10≤d1/TTL≤0.36。
5. a camera optical lens according to claim 1, wherein the focal length of the second lens element is f2, the optical length of the camera optical lens is TTL, and the following relation is satisfied:
-1.22≤f2/f≤-0.33；
0.02≤d3/TTL≤0.09。
6. a photographic optical lens according to claim 1, wherein the on-axis thickness of the third lens is d5, the optical length of the photographic optical lens is TTL, and the following relation is satisfied:
0.03≤d5/TTL≤0.12。
7. the image-capturing optical lens of 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 optical length of the image-capturing optical lens is TTL, and the following relationships are satisfied:
0.47≤(R7+R8)/(R7-R8)≤4.07；
0.02≤d7/TTL≤0.06。
8. the image-capturing optical lens unit according to claim 1, wherein the fifth lens element has a focal length f5, a radius of curvature of an object-side surface of the fifth lens element is R9, a radius of curvature of an image-side surface of the fifth lens element is R10, an on-axis thickness of the fifth lens element is d9, an optical length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-16.97≤f5/f≤51.39；
-20.03≤(R9+R10)/(R9-R10)≤198.64；
0.05≤d9/TTL≤0.21。
9. a camera optical lens according to claim 1, wherein the total optical length of the camera optical lens is TTL and satisfies the following relation:
f/TTL≥1.14。
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| WO2021127898A1 (en) * | 2019-12-23 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| WO2021134309A1 (en) * | 2019-12-30 | 2021-07-08 | 天津欧菲光电有限公司 | Optical lens group, camera module, and terminal |
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| CN105988186B (en) * | 2015-06-09 | 2018-09-07 | 浙江舜宇光学有限公司 | Imaging lens |
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