CN110221409B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN110221409B CN110221409B CN201910581573.0A CN201910581573A CN110221409B CN 110221409 B CN110221409 B CN 110221409B CN 201910581573 A CN201910581573 A CN 201910581573A CN 110221409 B CN110221409 B CN 110221409B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises from an object side to an image side: a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with refractive power; the total system focal length of the image pickup optical lens is f, the focal length of the second lens is f2, the on-axis thickness of the second lens is d3, the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, and the curvature radius of the image side surface of the third lens is R6, so that the following relation is satisfied: d3/d4 is more than or equal to 2.50 and less than or equal to 4.50; f2/f is more than or equal to 1.20 and less than or equal to 2.00; r6 is less than or equal to 0.00 mm. 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 a three-piece or four-piece lens structure. However, with the development of technology and the increasing of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system 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 focal power, the lens interval and the lens shape setting still have certain irrationality, so that the design requirements of long focal length and ultra-thinness 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, a wide angle, and an ultra-thin profile.
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 negative refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with refractive power;
the total system focal length of the image pickup optical lens is f, the focal length of the second lens is f2, the on-axis thickness of the second lens is d3, the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, and the curvature radius of the image side surface of the third lens is R6, so that the following relation is satisfied:
2.50≤d3/d4≤4.50；
1.20≤f2/f≤2.00；
R6≤0.00mm。
preferably, the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, and the following relationship is satisfied:
1.00≤(R7+R8)/(R7-R8)≤5.00。
preferably, the focal length of the third lens is f3, and the following relation is satisfied:
-3.00≤f3/f≤-1.50。
preferably, the focal length of the first lens element is f1, the curvature radius of the object-side surface of the first lens element is R1, the curvature radius of the image-side surface of the first lens element is R2, the on-axis thickness of the first lens element is d1, and the total optical length of the image pickup optical lens system is TTL, and the following relationships are satisfied:
-444.85≤f1/f≤-36.96；
9.48≤(R1+R2)/(R1-R2)≤57.63；
0.05≤d1/TTL≤0.16。
preferably, the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, and the total optical length of the image pickup optical lens system is TTL, and the following relationships are satisfied:
0.18≤(R3+R4)/(R3-R4)≤0.66；
0.07≤d3/TTL≤0.25。
preferably, the radius of curvature of the object-side surface of the third lens element is R5, the on-axis thickness of the third lens element is d5, and the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied:
-4.74≤(R5+R6)/(R5-R6)≤-0.68；
0.03≤d5/TTL≤0.09。
preferably, the focal length of the fourth lens is f4, the on-axis thickness of the fourth lens is d7, and the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
0.25≤f4/f≤2.35；
0.05≤d7/TTL≤0.26。
preferably, the focal length of the fifth lens element is f5, the radius of curvature of the object-side surface of the fifth lens element is R9, the radius of curvature of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, and the total optical length of the image pickup optical lens system is TTL, and the following relationships are satisfied:
-1.44≤f5/f≤244.82；
0.86≤(R9+R10)/(R9-R10)≤11.94；
0.04≤d9/TTL≤0.21。
preferably, the total optical length of the image pickup optical lens is TTL, and the image height of the image pickup optical lens is IH, and the following relationship is satisfied:
TTL/IH≤1.71。
preferably, the angle of view of the imaging optical lens is Fov, the F-number of the aperture of the imaging optical lens is Fno, and the following relational expression is satisfied:
Fov≥100.00°；
Fno≤2.45。
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;
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.
[ 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 first lens L1, a stop S1, 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 first lens element L1 has negative refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power, and the fifth lens element has refractive power.
In the present embodiment, the on-axis thickness of the second lens L2 is d3, the on-axis distance d4 from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 satisfies the following relation: 2.50 < d3/d4 < 4.50, and the ratio of the thickness of the second lens L2 to the air spacing distance between the second lens L2 and the third lens L3 is regulated, so that the processing of the lens and the assembly of the lens are facilitated within the conditional expression range.
Defining the total system focal length f of the image pickup optical lens 10, the focal length f2 of the second lens L2, and satisfying the following relations: f2/f is more than or equal to 1.20 and less than or equal to 2.00; when f2/f satisfies the condition, the focal power of the second lens L2 can be effectively distributed, the aberration of the optical system is corrected, and the imaging quality is improved.
The curvature radius of the image side surface of the third lens L3 is defined as R6, and the following relation is satisfied: r6 is less than or equal to 0.00mm, the shape of the image side surface of the third lens L3 is regulated, the deflection degree of light rays passing through the lens can be relieved, and aberration is effectively reduced.
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: 1.00-5.00 (R7+ R8)/(R7-R8). The shape of the fourth lens L4 is defined, so that aberrations generated by the three front lenses of the optical system can be effectively corrected.
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-3.00 and less than or equal to-1.50. The ratio of the focal length of the third lens L3 to the focal length of the system is specified, which contributes to the improvement of the optical system performance within the conditional expression range.
Defining the focal length of the first lens L1 as f1, the focal length of the entire image pickup optical lens 10 as f, and satisfying the following relations: f1/f is not less than-36.96 and is not less than-444.85; the ratio of the negative refractive power to the overall focal length of the first lens element L1 is specified. When the first lens element is within the specified range, the first lens element has appropriate negative refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thinning and wide-angle lens.
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: 9.48 is less than or equal to (R1+ R2)/(R1-R2) is less than or equal to 57.63; the shape of the first lens L1 is appropriately controlled so that the first lens L1 can effectively correct the system spherical aberration.
The on-axis thickness of the first lens L1 is defined as d1, and the total optical length of the image pickup optical lens 10 is defined as TTL, and the following relations are satisfied: d1/TTL is more than or equal to 0.05 and less than or equal to 0.16; and the ultra-thinning is favorably realized.
The curvature radius of the object side surface of the second lens is defined as R3, the curvature radius of the image side surface of the second lens is defined as R4, and the following relations are satisfied: the second lens L2 is defined in a shape of (R3+ R4)/(R3-R4) of 0.18 or more and (R3+ R4)/(R3-R4) or less, and when the second lens L2 is within the range, the second lens L2 is advantageous for correcting the problem of chromatic aberration on the axis as the lens is made to have a super-thin wide angle.
The on-axis thickness of the second lens L2 is defined as d3, and the total optical length of the image pickup optical lens 10 is defined as TTL, and the following relations are satisfied: d3/TTL is more than or equal to 0.07 and less than or equal to 0.25, and ultra-thinning is facilitated.
The curvature radius of the object side surface of the third lens L3 is defined as R5, and the curvature radius of the image side surface of the third lens L3 is defined as R6, and the following relations are satisfied: the ratio of (R5+ R6)/(R5-R6) is not more than 4.74 and not more than 0.68, the shape of the third lens L3 can be effectively controlled, the molding of the third lens L3 is facilitated, and the poor molding and stress generation caused by the overlarge surface curvature of the third lens L3 are avoided.
The on-axis thickness of the third lens L3 is defined as d5, and the total optical length of the image pickup optical lens 10 is defined as TTL, and the following relations are satisfied: d5/TTL is more than or equal to 0.03 and less than or equal to 0.09, and ultra-thinning is facilitated.
Defining the focal length of the fourth lens L4 as f4, the following relation is satisfied: f4/f is more than or equal to 0.25 and less than or equal to 2.35, the ratio of the focal length of the fourth lens L4 to the focal length of the system is specified, 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 element L4 is d7, and the total optical length of the imaging optical lens system 10 is TTL, and satisfies the following relationship: d7/TTL is more than or equal to 0.05 and less than or equal to 0.26, and ultra-thinning is facilitated.
Defining the focal length of the fifth lens L5 as f5, the following relation is satisfied: -1.44. ltoreq. f5/f 244.82. The definition of the fifth lens L5 can effectively make the light ray angle of the camera lens smooth, and reduce tolerance sensitivity.
The curvature radius of the object side surface of the fifth lens L5 is defined as R9, and the curvature radius of the image side surface of the fifth lens is defined as R10, and the following relations are satisfied: not less than 0.86 (R9+ R10)/(R9-R10) not more than 11.94. The shape of the fifth lens L5 is defined, and when the shape is within the range, it is advantageous to correct the problem such as the aberration of the off-axis view angle with the progress of ultra-thinning and wide-angle.
The on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length of the image pickup optical lens 10 is defined as TTL, and the following relationships are satisfied: d9/TTL is more than or equal to 0.04 and less than or equal to 0.21, and ultra-thinning is facilitated.
Further, TTL is the total optical length of the image pickup optical lens 10, and IH is the image height of the image pickup optical lens 10, and the following relationships are satisfied: TTL/IH is less than or equal to 1.71, and ultra-thinning is facilitated; the F number of the diaphragm of the imaging optical lens satisfies the following relational expression: fno is less than or equal to 2.45, which is beneficial to realizing a large aperture and ensures good imaging performance; the angle of view is Fov, and the following relation is satisfied: fov is more than or equal to 100.00 degrees, which is beneficial to realizing wide angle. That is, when the above relationship is satisfied, the imaging optical lens 10 can satisfy the design requirements of large aperture and ultra-thinness while having good optical imaging performance; 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, 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, 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 |
Position of reverse curvature 3 | |
| |
0 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 |
| P2R1 | 1 | 0.275 | 0 | 0 |
| |
0 | 0 | 0 | 0 |
| P3R1 | 1 | 0.615 | 0 | 0 |
| P3R2 | 1 | 0.755 | 0 | 0 |
| |
2 | 0.135 | 0.495 | 0 |
| |
2 | 0.615 | 1.075 | 0 |
| P5R1 | 3 | 0.315 | 1.105 | 1.345 |
| P5R2 | 1 | 0.415 | 0 | 0 |
[ TABLE 4 ]
| Number of stagnation points | Location of stagnation 1 | Location of |
|
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| P2R1 | 1 | 0.385 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
2 | 0.235 | 0.625 |
| |
0 | 0 | 0 |
| P5R1 | 1 | 0.555 | 0 |
| P5R2 | 1 | 1.135 | 0 |
Fig. 2 and 3 show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 436nm, 486nm, 546nm, 588nm, and 656nm passes through the imaging optical lens 10 of the first embodiment, respectively. Fig. 4 is a schematic view showing the field curvature and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 10 according to the first embodiment, where the field curvature S in fig. 4 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.
Table 17 shown later shows values corresponding to the parameters defined in the conditional expressions, for each of the numerical values in the first, second, third, and fourth embodiments.
As shown in table 17, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter of 0.808mm, a full field image height of 2.285mm, and a diagonal field angle of 100.00 °, and has a wide angle, a large aperture, and an ultra-thin thickness, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
(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 reverse curvature 1 | Position of |
|
| P1R1 | 1 | 0.935 | 0 |
| P1R2 | 1 | 0.685 | 0 |
| P2R1 | 1 | 0.265 | 0 |
| |
0 | 0 | 0 |
| P3R1 | 1 | 0.605 | 0 |
| P3R2 | 1 | 0.725 | 0 |
| |
2 | 0.425 | 0.715 |
| |
2 | 0.615 | 1.035 |
| |
2 | 0.305 | 1.155 |
| |
2 | 0.405 | 1.835 |
[ TABLE 8 ]
| Number of stagnation points | Location of stagnation 1 | |
| |
0 | 0 |
| |
0 | 0 |
| P2R1 | 1 | 0.385 |
| |
0 | 0 |
| |
0 | 0 |
| |
0 | 0 |
| |
0 | 0 |
| |
0 | 0 |
| P5R1 | 1 | 0.555 |
| P5R2 | 1 | 1.155 |
Fig. 6 and 7 show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 436nm, 486nm, 546nm, 588nm, and 656nm passes through the imaging optical lens 20 of the second embodiment, respectively. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 20 according to the second embodiment.
As shown in table 17, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens 20 has an entrance pupil diameter of 0.808mm, a full field image height of 2.285mm, and a diagonal field angle of 100.00 °, 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 reverse curvature 1 | Position of |
Position of reverse curvature 3 | Position of reverse curve 4 | |
| P1R1 | 1 | 0.845 | 0 | 0 | 0 |
| P1R2 | 1 | 0.585 | 0 | 0 | 0 |
| P2R1 | 1 | 0.215 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 | 0 |
| P3R1 | 1 | 0.615 | 0 | 0 | 0 |
| |
2 | 0.755 | 0.885 | 0 | 0 |
| P4R1 | 4 | 0.045 | 0.355 | 0.605 | 0.745 |
| |
2 | 0.625 | 1.065 | 0 | 0 |
| P5R1 | 3 | 0.385 | 1.115 | 1.545 | 0 |
| P5R2 | 1 | 0.435 | 0 | 0 | 0 |
[ TABLE 12 ]
| Number of stagnation points | Location of stagnation 1 | Location of |
Location of stagnation 3 | Location of stagnation 4 | |
| |
0 | 0 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 | 0 |
| P2R1 | 1 | 0.325 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 | 0 |
| P4R1 | 4 | 0.065 | 0.555 | 0.645 | 0.795 |
| |
0 | 0 | 0 | 0 | 0 |
| P5R1 | 3 | 0.745 | 1.475 | 1.605 | 0 |
| P5R2 | 1 | 1.355 | 0 | 0 | 0 |
Fig. 10 and 11 show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 436nm, 486nm, 546nm, 588nm, and 656nm passes through the imaging optical lens 30 of the third embodiment, respectively. 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 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.808mm, a full field image height of 2.285mm, and a diagonal field angle of 100.00 °, so that the imaging optical lens 30 has a wide angle, an ultra-thin, and a large aperture, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
(fourth embodiment)
The fourth 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 40 of the fourth embodiment is shown in fig. 13, and only the differences will be described below.
Tables 13 and 14 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 13 ]
Table 14 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 14 ]
Tables 15 and 16 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 15 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of |
Position of reverse curvature 3 | |
| |
0 | 0 | 0 | 0 |
| P1R2 | 1 | 0.565 | 0 | 0 |
| P2R1 | 1 | 0.225 | 0 | 0 |
| |
0 | 0 | 0 | 0 |
| P3R1 | 1 | 0.585 | 0 | 0 |
| |
2 | 0.725 | 0.865 | 0 |
| |
2 | 0.205 | 0.425 | 0 |
| P4R2 | 1 | 0.595 | 0 | 0 |
| P5R1 | 3 | 0.355 | 1.075 | 1.245 |
| P5R2 | 1 | 0.465 | 0 | 0 |
[ TABLE 16 ]
| Number of stagnation points | Location of stagnation 1 | |
| |
0 | 0 |
| |
0 | 0 |
| P2R1 | 1 | 0.335 |
| |
0 | 0 |
| |
0 | 0 |
| |
0 | 0 |
| |
0 | 0 |
| |
0 | 0 |
| P5R1 | 1 | 0.755 |
| P5R2 | 1 | 1.255 |
Fig. 14 and 15 are schematic diagrams showing axial aberration and chromatic aberration of magnification after light having wavelengths of 436nm, 486nm, 546nm, 588nm, and 656nm passes through the imaging optical lens 40 of the fourth embodiment, respectively. Fig. 16 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 40 according to the fourth embodiment.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens 40 has an entrance pupil diameter of 0.809mm, a full field image height of 2.285mm, and a diagonal field angle of 100.00 °, and has excellent optical characteristics with a wide angle and a slim size, and with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 17 ]
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 system comprising five lens elements, in order from an object side to an image side: a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with refractive power;
the total system focal length of the image pickup optical lens is f, the focal length of the second lens is f2, the on-axis thickness of the second lens is d3, the on-axis distance between the image side surface of the second lens and the object side surface of the third lens is d4, the curvature radius of the image side surface of the third lens is R6, the total optical length of the image pickup optical lens is TTL, and the image height of the image pickup optical lens is IH, and the following relations are satisfied:
2.50≤d3/d4≤4.50；
1.20≤f2/f≤2.00；
R6≤0.00mm；
TTL/IH≤1.71。
2. the imaging optical lens of claim 1, wherein the fourth lens object-side surface has a radius of curvature of R7, the fourth lens image-side surface has a radius of curvature of R8, and the following relationship is satisfied:
1.00≤(R7+R8)/(R7-R8)≤5.00。
3. the imaging optical lens according to claim 1, wherein the third lens has a focal length f3 and satisfies the following relationship:
-3.00≤f3/f≤-1.50。
4. the imaging optical lens of claim 1, wherein the focal length of the first lens is f1, 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, the on-axis thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
-444.85≤f1/f≤-36.96；
9.48≤(R1+R2)/(R1-R2)≤57.63；
0.05≤d1/TTL≤0.16。
5. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the image-side surface of the second lens element is R4, and the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:
0.18≤(R3+R4)/(R3-R4)≤0.66；
0.07≤d3/TTL≤0.25。
6. the imaging optical lens of claim 1, wherein a radius of curvature of an object-side surface of the third lens is R5, an on-axis thickness of the third lens is d5, and an optical total length of the imaging optical lens is TTL, and satisfies the following relationship:
-4.74≤(R5+R6)/(R5-R6)≤-0.68；
0.03≤d5/TTL≤0.09。
7. the image-taking optical lens according to claim 1, wherein a focal length of the fourth lens is f4, an on-axis thickness of the fourth lens is d7, and an optical total length of the image-taking optical lens is TTL, and the following relationship is satisfied:
0.25≤f4/f≤2.35；
0.05≤d7/TTL≤0.26。
8. the image-taking optical lens according to claim 1, wherein the focal length of the fifth lens element is f5, the radius of curvature of the object-side surface of the fifth lens element is R9, and 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 total optical length of the image-taking optical lens is TTL, and the following relationship is satisfied:
-1.44≤f5/f≤244.82；
0.86≤(R9+R10)/(R9-R10)≤11.94；
0.04≤d9/TTL≤0.21。
9. the imaging optical lens according to claim 1, wherein the angle of view of the imaging optical lens is Fov, the F-number of the aperture of the imaging optical lens is Fno, and the following relationship is satisfied:
Fov≥100.00°；
Fno≤2.45。
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