CN112684580B - Image pickup optical lens - Google Patents
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Abstract
The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises the following components 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 negative refractive power, and a fourth lens element with positive refractive power; the focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the central curvature radius of the object-side surface of the second lens is R3, the central curvature radius of the image-side surface of the second lens is R4, the central curvature radius of the object-side surface of the third lens is R5, the central curvature radius of the image-side surface of the third lens is R6, 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 d6, and the following relational expressions are satisfied: f1/f is more than or equal to 0.30 and less than or equal to 0.50; f2/f is more than or equal to-0.80 and less than or equal to-0.40; R3/R4 is more than or equal to 5.00; d6/d5 is more than or equal to 2.00 and less than or equal to 9.00; R5/R6 is not less than-1.20 and is not less than-5.00.
Description
Technical Field
The present invention relates to the field of optical lenses, and more particularly, to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging apparatuses such as monitors and PC lenses.
Background
In recent years, with the rise of various smart devices, the demand for miniaturized photographing optical lenses is increasing, and due to the reduction of the pixel size of the photosensitive device and the trend of the electronic products toward the appearance of good function and being light, thin and portable, the miniaturized photographing optical lenses with good imaging quality are the mainstream in the market at present. In order to obtain better imaging quality, a multi-lens structure is often used. Moreover, with the development of technology and the increase of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system on the imaging quality is continuously improved, the four-piece lens structure gradually appears in the lens design. There is a strong demand for a telephoto imaging lens having excellent optical characteristics, a small size, and sufficiently corrected aberrations.
Disclosure of 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 ultra-thin and 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 negative refractive power, and a fourth lens element with positive refractive power;
the focal length of the image pickup optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the central curvature radius of the object side surface of the second lens is R3, the central curvature radius of the image side surface of the second lens is R4, the central curvature radius of the object side surface of the third lens is R5, the central curvature radius of the image side surface of the third lens is R6, the on-axis thickness of the third lens is d5, the on-axis distance from the image side surface of the third lens to the object side surface of the fourth lens is d6, and the following relational expressions are satisfied: f1/f is more than or equal to 0.30 and less than or equal to 0.50; f2/f is more than or equal to-0.80 and less than or equal to-0.40; R3/R4 is more than or equal to 5.00; d6/d5 is more than or equal to 2.00 and less than or equal to 9.00; R5/R6 is not less than-1.20 and is not less than-5.00.
Preferably, the focal length of the fourth lens is f4, and the following relation is satisfied: f4/f is more than or equal to 0.60 and less than or equal to 1.30.
Preferably, the object-side surface of the first lens element is convex at the paraxial region thereof, and the image-side surface of the first lens element is convex at the paraxial region thereof; the center curvature radius of the object side surface of the first lens is R1, the center curvature radius of the image side surface of the first lens is R2, the on-axis thickness of the first lens is d1, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: -0.96 ≤ (R1+ R2)/(R1-R2) ≤ 0.23; d1/TTL is more than or equal to 0.12 and less than or equal to 0.40.
Preferably, the imaging optical lens satisfies the following relation: -0.60 ≦ (R1+ R2)/(R1-R2) ≦ -0.29; d1/TTL is more than or equal to 0.19 and less than or equal to 0.32.
Preferably, the object-side surface of the second lens element is convex at the paraxial region, and the image-side surface of the second lens element is concave at the paraxial region; the on-axis thickness of the second lens is d3, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: not less than 0.57 (R3+ R4)/(R3-R4) not less than 2.23; d3/TTL is more than or equal to 0.02 and less than or equal to 0.08.
Preferably, the imaging optical lens satisfies the following relation: (R3+ R4)/(R3-R4) is more than or equal to 0.91 and less than or equal to 1.78; d3/TTL is more than or equal to 0.04 and less than or equal to 0.07.
Preferably, the object-side surface of the third lens element is concave at the paraxial region, and the image-side surface of the third lens element is concave at the paraxial region; the focal length of the third lens is f3, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: f3/f is more than or equal to-1.14 and less than or equal to-0.19; (R5+ R6)/(R5-R6) is more than or equal to 0.05 and less than or equal to 0.95; d5/TTL is more than or equal to 0.01 and less than or equal to 0.07.
Preferably, the imaging optical lens satisfies the following relation: f3/f is more than or equal to-0.71 and less than or equal to-0.24; (R5+ R6)/(R5-R6) is more than or equal to 0.07 and less than or equal to 0.76; d5/TTL is more than or equal to 0.02 and less than or equal to 0.05.
Preferably, the image-side surface of the fourth lens is convex at the paraxial region; the center curvature radius of the object side surface of the fourth lens is R7, the center curvature radius of the image side surface of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: (R7+ R8)/(R7-R8) is more than or equal to 0.24 and less than or equal to 3.49; d7/TTL is more than or equal to 0.07 and less than or equal to 0.26.
Preferably, the imaging optical lens satisfies the following relation: (R7+ R8)/(R7-R8) is more than or equal to 0.39 and less than or equal to 2.79; d7/TTL is more than or equal to 0.11 and less than or equal to 0.21.
Preferably, the image height of the image pickup optical lens is IH, the total optical length of the image pickup optical lens is TTL, and the following relation is satisfied: TTL/IH is less than or equal to 3.95.
Preferably, the image height of the imaging optical lens is IH, and the following relation is satisfied: f/IH is more than or equal to 3.20.
Preferably, the combined focal length of the first lens and the second lens is f12, and the following relation is satisfied: f12/f is more than or equal to 0.25 and less than or equal to 1.13.
Preferably, the aperture value of the imaging optical lens is FNO, and satisfies the following relationship: FNO is less than or equal to 3.14.
The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, has a long focal length and is ultra-thin, and is particularly suitable for a mobile phone imaging lens assembly and a WEB imaging lens which are constituted by imaging elements such as a CCD and a CMOS for high pixel.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be 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 of the present invention;
FIG. 2 is a schematic axial aberration diagram of the imaging optical lens of FIG. 1;
fig. 3 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 1;
FIG. 4 is a schematic view of curvature of field and distortion of the imaging optical lens of FIG. 1;
fig. 5 is a schematic configuration diagram of an imaging optical lens according to a second embodiment of the present invention;
FIG. 6 is a schematic axial aberration diagram of the imaging optical lens of FIG. 5;
fig. 7 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 5;
FIG. 8 is a schematic view of curvature of field and distortion of the imaging optical lens of FIG. 5;
fig. 9 is a schematic configuration diagram of an imaging optical lens according to a third embodiment of the present invention;
fig. 10 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 9;
fig. 11 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 9;
FIG. 12 is a schematic view of curvature of field and distortion of the imaging optical lens of FIG. 9;
fig. 13 is a schematic configuration diagram of an image pickup optical lens according to a fourth embodiment of the present invention;
fig. 14 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 13;
fig. 15 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 13;
fig. 16 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 13.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.
(first embodiment)
Referring to the drawings, the present invention provides an image pickup optical lens 10. Fig. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes four lenses in total. Specifically, the image capturing optical lens system 10, in order from an object side to an image side: the lens comprises a first lens L1, a second lens L2, a diaphragm S1, a third lens L3 and a fourth lens L4. An optical element such as an optical filter (filter) GF may be disposed between the fourth lens L4 and the image plane Si.
In this embodiment, the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are made of plastic materials, respectively. In other alternative embodiments, each lens may be made of other materials.
In the present embodiment, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has negative refractive power, and the fourth lens element L4 has positive refractive power.
In the present embodiment, the focal length of the imaging optical lens 10 is defined as f, and the focal length of the first lens L1 is defined as f1, and the following relational expression is satisfied: f1/f is more than or equal to 0.30 and less than or equal to 0.50, and the ratio of the focal length f1 of the first lens L1 to the focal length f of the imaging optical lens 10 is defined, so that the spherical aberration and the curvature of field of the system can be effectively balanced.
Defining the focal length f of the image pickup optical lens 10 and the focal length f2 of the second lens L2, the following relations are satisfied: f2/f is more than or equal to 0.80 and less than or equal to-0.40, the ratio of the focal length f2 of the second lens L2 to the focal length f of the image pickup optical lens 10 is specified, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal lengths.
The central curvature radius of the object side surface of the second lens L2 is defined as R3, and the central curvature radius of the image side surface of the second lens L2 is defined as R4, and the following relations are satisfied: R3/R4 is more than or equal to 5.00, the shape of the second lens L2 is regulated, and the deflection degree of light rays passing through the lens can be alleviated within the range regulated by the conditional expression, so that the aberration can be effectively reduced. Preferably, 5.07. ltoreq.R 3/R4 is satisfied.
Defining the on-axis thickness of the third lens L3 as 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 as d6, the following relations are satisfied: 2.00 < d6/d5 < 9.00, and the ratio of the on-axis distance d6 from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4 to the on-axis thickness d5 of the third lens L3 is defined, which contributes to the reduction of the total length of the optical system in the conditional expression range, and achieves the effect of making the optical system ultra thin. Preferably, 2.42. ltoreq. d6/d 5. ltoreq.8.73.
The central curvature radius of the object side surface of the third lens L3 is defined as R5, and the central curvature radius of the image side surface of the third lens L3 is defined as R6, and the following relations are satisfied: R5/R6 of-5.00. ltoreq. R3, which defines the shape of the third lens L3, is advantageous for correcting the aberration of the off-axis view angle within the conditional range. Preferably, it satisfies-4.72. ltoreq. R5/R6. ltoreq. 1.20.
Defining the focal length f of the image pickup optical lens 10 and the focal length f4 of the fourth lens L4, the following relations are satisfied: f4/f is more than or equal to 0.60 and less than or equal to 1.30, the ratio of the focal length f4 of the fourth lens L4 to the focal length f of the shooting optical lens 10 is regulated, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal lengths.
In this embodiment, the object-side surface of the first lens element L1 is convex at the paraxial region, and the image-side surface is convex at the paraxial region. In other alternative embodiments, the object-side surface and the image-side surface of the first lens L1 may be arranged in other concave and convex distribution situations.
The central curvature radius of the object side surface of the first lens L1 is defined as R1, and the central curvature radius of the image side surface of the first lens L1 is defined as R2, and the following relations are satisfied: 0.96 ≦ (R1+ R2)/(R1-R2) ≦ -0.23, and the shape of the first lens L1 is controlled appropriately so that the first lens L1 can correct the system spherical aberration effectively. Preferably, it satisfies-0.60 ≦ (R1+ R2)/(R1-R2). ltoreq.0.29.
The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens system 10 is TTL, and the following relational expression is satisfied: d1/TTL is more than or equal to 0.12 and less than or equal to 0.40, and ultra-thinning is facilitated in the conditional expression range. Preferably, 0.19. ltoreq. d 1/TTL. ltoreq.0.32 is satisfied.
In this embodiment, the object-side surface of the second lens element L2 is convex at the paraxial region, and the image-side surface is concave at the paraxial region. In other alternative embodiments, the object-side surface and the image-side surface of the second lens L2 may be arranged in other concave and convex distribution.
The central curvature radius of the object side surface of the second lens L2 is defined as R3, and the central curvature radius of the image side surface of the second lens L2 is defined as R4, and the following relations are satisfied: the second lens element L2 is defined to have a shape of 0.57 ≦ (R3+ R4)/(R3-R4) or less 2.23, and is advantageous for correcting the chromatic aberration on the axis when the shape is within the range. Preferably, 0.91 ≦ (R3+ R4)/(R3-R4) ≦ 1.78 is satisfied.
The on-axis thickness of the second lens L2 is d3, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d3/TTL is more than or equal to 0.02 and less than or equal to 0.08, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.04. ltoreq. d 3/TTL. ltoreq.0.07 is satisfied.
In the present embodiment, the object-side surface of the third lens element L3 is concave in the paraxial region, and the image-side surface is concave in the paraxial region. In other alternative embodiments, the object-side surface and the image-side surface of the third lens L3 may be arranged in other concave and convex distribution.
Defining the focal length of the image pickup optical lens 10 as f, and the focal length of the third lens L3 as f3, the following relations are satisfied: 1.14 ≦ f3/f ≦ -0.19, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-0.71. ltoreq. f 3/f. ltoreq.0.24.
The central curvature radius of the object side surface of the third lens L3 is R5, the central curvature radius of the image side surface of the third lens L3 is R6, and the following relations are satisfied: the shape of the third lens L3 is regulated to be not less than 0.05 (R5+ R6)/(R5-R6) and not more than 0.95, and the deflection degree of the light passing through the lens can be alleviated within the range regulated by the conditional expression, so that the aberration can be effectively reduced. Preferably, 0.07 ≦ (R5+ R6)/(R5-R6) ≦ 0.76.
The on-axis thickness of the third lens L3 is d5, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d5/TTL is more than or equal to 0.01 and less than or equal to 0.07, and the ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.02. ltoreq. d 5/TTL. ltoreq.0.05 is satisfied.
In this embodiment, the object-side surface of the fourth lens element L4 is concave at the paraxial region, and the image-side surface thereof is convex at the paraxial region. In other alternative embodiments, the object-side surface and the image-side surface of the fourth lens L4 may be arranged in other concave and convex distribution situations.
The central curvature radius of the object side surface of the fourth lens L4 is defined as R7, and the central curvature radius of the image side surface of the fourth lens L4 is defined as R8, and the following relations are satisfied: the (R7+ R8)/(R7-R8) is 0.24 or more and 3.49 or less, and the shape of the fourth lens L4 is defined so that the aberration of the off-axis view angle can be corrected within the range. Preferably, 0.39. ltoreq. (R7+ R8)/(R7-R8). ltoreq.2.79 is satisfied.
The on-axis thickness of the fourth lens L4 is d7, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d7/TTL is more than or equal to 0.07 and less than or equal to 0.26, and ultra-thinning is facilitated in the conditional expression range. Preferably, 0.11. ltoreq. d 7/TTL. ltoreq.0.21.
In the present embodiment, the image height of the image pickup optical lens 10 is IH, the total optical length of the image pickup optical lens 10 is TTL, and the following relational expression is satisfied: TTL/IH is less than or equal to 3.95, thereby being beneficial to realizing ultra-thinning.
In the present embodiment, the focal length of the imaging optical lens 10 is f, the image height of the imaging optical lens 10 is IH, and the following relation is satisfied: f/IH is more than or equal to 3.20, thereby realizing long focal length.
In this embodiment, the aperture value FNO of the imaging optical lens 10 is less than or equal to 3.14, so that a large aperture is realized and the imaging performance of the imaging optical lens 10 is good. Preferably, the aperture value FNO of the imaging optical lens 10 is less than or equal to 3.08.
In the present embodiment, the focal length of the imaging optical lens 10 is defined as f, and the combined focal length of the first lens L1 and the second lens L2 is defined as f12, which satisfies the following relation: f12/f is not less than 0.25 and not more than 1.13, so that the aberration and distortion of the image pickup optical lens 10 can be eliminated, the back focal length of the image pickup optical lens 10 can be suppressed, and the miniaturization of the image lens system can be maintained. Preferably, 0.39. ltoreq. f 12/f. ltoreq.0.90.
The photographic optical lens 10 has good optical performance and can meet the design requirements of long focal length and ultra-thinness; in accordance with the characteristics of the imaging optical lens 10, the imaging optical lens 10 is particularly suitable for a mobile phone imaging lens module and a WEB imaging lens which are configured by an imaging element such as a high-pixel CCD or 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, center curvature radius, on-axis thickness, position of the reverse curvature point and the position of the 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 Si) is in mm;
aperture value FNO: is the ratio of the effective focal length and the entrance pupil diameter of the imaging optical lens.
Preferably, the object-side surface and/or the image-side surface of the lens may further be provided with an inflection point and/or a stagnation point, so as 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: a radius of curvature at the center of the optical surface;
r1: the center radius of curvature of the object side of the first lens L1;
r2: the central radius of curvature of the image-side surface of the first lens L1;
r3: the center radius of curvature of the object side of the second lens L2;
r4: the central radius of curvature of the image-side surface of the second lens L2;
r5: the center radius of curvature of the object side of the third lens L3;
r6: the central radius of curvature of the image-side surface of the third lens L3;
r7: the center radius of curvature of the object side of the fourth lens L4;
r8: the central radius of curvature of the image-side surface of the fourth lens L4;
r9: the central radius of curvature of the object side of the optical filter GF;
r10: the center radius of curvature of the image side of the optical filter GF;
d: on-axis thickness of the lenses, 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: the on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the optical filter GF;
d 9: on-axis thickness of the optical filter GF;
d 10: the axial distance from the image side surface of the optical filter GF to the image surface Si;
nd: refractive index of d-line (d-line is green light with wavelength of 550 nm);
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;
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;
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 ]
For convenience, an aspherical surface shown in the following formula (1) is used as an aspherical surface of each lens surface. However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).
z＝(cr2)/{1+[1-(k+1)(c2r2)]1/2}+A4r4+A6r6+A8r8+A10r10+A12r12+A14r14+A16r16+A18r18+A20r20 (1)
Where k is a conic coefficient, a4, a6, A8, a10, a12, a14, a16, a18, a20 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at r from the optical axis and a tangent plane tangent to the vertex on the aspheric optical axis).
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. Wherein, 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, and P4R1 and P4R2 represent the object side surface and the image side surface of the fourth lens L4, 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 inflection point 2 | |
| P1R1 | 1 | 1.665 | / |
| |
0 | / | / |
| P2R1 | 2 | 0.155 | 0.935 |
| |
0 | / | / |
| |
0 | / | / |
| |
0 | / | / |
| P4R1 | 1 | 1.435 | / |
| P4R2 | 1 | 1.675 | / |
[ TABLE 4 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| |
0 | / | / |
| |
0 | / | / |
| P2R1 | 2 | 0.285 | 1.165 |
| |
0 | / | / |
| |
0 | / | / |
| |
0 | / | / |
| |
0 | / | / |
| |
0 | / | / |
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively, after passing through the imaging optical lens 10 according to 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 16 shown later shows values corresponding to the parameters specified in the conditional expressions for each of the numerical values in the first, second, third, and fourth examples.
As shown in table 16, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter ENPD of 2.430mm, a full field image height IH of 1.827mm, and a diagonal field angle FOV of 15.50 °, and the imaging optical lens 10 satisfies the design requirements of a long focal length and a slimness, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(second embodiment)
The second embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.
Fig. 5 shows an imaging optical lens 20 according to a second embodiment of the present invention.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 6 ]
Tables 7 and 8 show the inflection point and stagnation point design data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 7 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | |
| P1R1 | 1 | 1.655 | / |
| |
0 | / | / |
| P2R1 | 2 | 0.155 | 0.905 |
| |
0 | / | / |
| |
0 | / | / |
| |
0 | / | / |
| P4R1 | 1 | 1.505 | / |
| P4R2 | 1 | 1.745 | / |
[ TABLE 8 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| |
0 | / | / |
| |
0 | / | / |
| P2R1 | 2 | 0.265 | 1.125 |
| |
0 | / | / |
| |
0 | / | / |
| |
0 | / | / |
| |
0 | / | / |
| |
0 | / | / |
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 20 according to the second embodiment. 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.
As shown in table 16, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens 20 has an entrance pupil diameter ENPD of 2.774mm, a full-field image height IH of 1.827mm, and a diagonal field angle FOV of 15.11 °, and the imaging optical lens 20 satisfies the design requirements of a long focal length and a thin profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(third embodiment)
The third embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.
In the present embodiment, the object-side surface of the fourth lens element L4 is convex at the paraxial region.
Fig. 9 shows an imaging optical lens 30 according to a third embodiment of the present invention.
Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
Table 10 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 10 ]
Tables 11 and 12 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 11 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | |
| |
0 | / | / |
| |
0 | / | / |
| P2R1 | 2 | 0.255 | 0.855 |
| |
0 | / | / |
| |
0 | / | / |
| P3R2 | 1 | 0.515 | / |
| P4R1 | 1 | 0.935 | / |
| |
0 | / | / |
[ TABLE 12 ]
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 30 according to the third embodiment. 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.
Table 16 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 lens 30 of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens 30 has an entrance pupil diameter ENPD of 1.975mm, a full field height IH of 1.827mm, and a diagonal field angle FOV of 18.36 °, and the imaging optical lens 30 satisfies the design requirements of a long focal length and a slim size, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(fourth embodiment)
The fourth embodiment is basically the same as the first embodiment, and the same reference numerals as in the first embodiment, and only different points will be described below.
Fig. 13 shows an imaging optical lens 40 according to a fourth embodiment of the present invention.
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 ]
Table 15 shows the inflection point design data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 15 ]
Fig. 14 and 15 are schematic diagrams showing axial aberrations and chromatic aberrations of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 40 according to the fourth embodiment. 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.
Table 16 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 lens 40 of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens 40 has an entrance pupil diameter ENPD of 2.177mm, a full field height IH of 1.827mm, and a diagonal field angle FOV of 16.86 °, and the imaging optical lens 40 satisfies the design requirements of a long focal length and a slimness, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 16 ]
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 (13)
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 negative refractive power, and a fourth lens element with positive refractive power;
the focal length of the image pickup optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the fourth lens is f4, the central curvature radius of the object-side surface of the second lens is R3, the central curvature radius of the image-side surface of the second lens is R4, the central curvature radius of the object-side surface of the third lens is R5, the central curvature radius of the image-side surface of the third lens is R6, the on-axis thickness of the third lens is d5, the on-axis distance from the image-side surface of the third lens to the object-side surface of the fourth lens is d6, and the following relational expressions are satisfied:
0.30≤f1/f≤0.50；
-0.80≤f2/f≤-0.40；
0.60≤f4/f≤1.30；
5.00≤R3/R4；
2.00≤d6/d5≤9.00；
-5.00≤R5/R6≤-1.20。
2. the imaging optical lens of claim 1, wherein the object-side surface of the first lens element is convex at paraxial region and the image-side surface of the first lens element is convex at paraxial region;
the center curvature radius of the object side surface of the first lens is R1, the center curvature radius of the image side surface of the first lens is R2, the on-axis thickness of the first lens is d1, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied:
-0.96≤(R1+R2)/(R1-R2)≤-0.23；
0.12≤d1/TTL≤0.40。
3. the imaging optical lens according to claim 2, wherein the imaging optical lens satisfies the following relationship:
-0.60≤(R1+R2)/(R1-R2)≤-0.29；
0.19≤d1/TTL≤0.32。
4. the imaging optical lens of claim 1, wherein the object-side surface of the second lens element is convex at paraxial region and the image-side surface of the second lens element is concave at paraxial region;
the on-axis thickness of the second lens is d3, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied:
0.57≤(R3+R4)/(R3-R4)≤2.23；
0.02≤d3/TTL≤0.08。
5. the imaging optical lens according to claim 4, wherein the imaging optical lens satisfies the following relation:
0.91≤(R3+R4)/(R3-R4)≤1.78；
0.04≤d3/TTL≤0.07。
6. the imaging optical lens of claim 1, wherein the object-side surface of the third lens element is concave at paraxial region and the image-side surface of the third lens element is concave at paraxial region;
the focal length of the third lens is f3, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied:
-1.14≤f3/f≤-0.19；
0.05≤(R5+R6)/(R5-R6)≤0.95；
0.01≤d5/TTL≤0.07。
7. the imaging optical lens according to claim 6, wherein the imaging optical lens satisfies the following relation:
-0.71≤f3/f≤-0.24；
0.07≤(R5+R6)/(R5-R6)≤0.76；
0.02≤d5/TTL≤0.05。
8. the imaging optical lens of claim 1, wherein the image-side surface of the fourth lens element is convex at the paraxial region;
the center curvature radius of the object side surface of the fourth lens is R7, the center curvature radius of the image side surface of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied:
0.24≤(R7+R8)/(R7-R8)≤3.49；
0.07≤d7/TTL≤0.26。
9. the image-pickup optical lens according to claim 8, wherein the image-pickup optical lens satisfies the following relation:
0.39≤(R7+R8)/(R7-R8)≤2.79；
0.11≤d7/TTL≤0.21。
10. a camera optical lens according to claim 1, wherein the image height of the camera optical lens is IH, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:
TTL/IH≤3.95。
11. an imaging optical lens according to claim 1, wherein the image height of the imaging optical lens is IH and satisfies the following relation:
f/IH≥3.20。
12. the imaging optical lens according to claim 1, wherein a combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied:
0.25≤f12/f≤1.13。
13. the imaging optical lens according to claim 1, wherein an aperture value of the imaging optical lens is FNO, and satisfies the following relationship:
FNO≤3.14。
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Effective date of registration: 20221101 Address after: 215000 133 Weixin Road, Suzhou Industrial Park, Suzhou, Jiangsu Patentee after: Chengrui optics (Suzhou) Co.,Ltd. Address before: 215000 133 Weixin Road, Suzhou Industrial Park, Suzhou, Jiangsu Patentee before: Chengrui optics (Suzhou) Co.,Ltd. Patentee before: Chengrui optics (Shenzhen) Co.,Ltd. |