CN111025535B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111025535B CN111025535B CN201911289982.XA CN201911289982A CN111025535B CN 111025535 B CN111025535 B CN 111025535B CN 201911289982 A CN201911289982 A CN 201911289982A CN 111025535 B CN111025535 B CN 111025535B
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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
- G02B13/18—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 provides a photographic optical lens, which sequentially comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power and a fifth lens with negative refractive power from an object side to an image side, 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; f3/f is not less than-2.00 and not more than-0.80; d4/d5 is more than or equal to 1.20 and less than or equal to 1.70; d1/d2 is more than or equal to 20.00 and less than or equal to 30.00. The shooting optical lens has good optical performance and also meets the design requirements of large aperture, long focal length and ultra-thin thickness.
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 ]
With the development of imaging technology, imaging optical lenses are widely used in various electronic products, such as smart phones and digital cameras. In order to be portable, people are increasingly pursuing the lightness and thinness of electronic products, and therefore, the small-sized image pickup optical lens with good imaging quality is the mainstream of the current market.
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.
Therefore, it is necessary to provide an imaging optical lens having excellent optical performance and satisfying the design requirements of long focal length and thinness.
[ summary of the invention ]
The invention aims to provide an imaging optical lens, aiming at solving the problems of long focal length and insufficient ultrathin of the traditional imaging optical lens.
The technical scheme of the invention is as follows: an imaging optical lens includes, in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power;
the focal length of the whole imaging optical lens is f, the focal length of the first lens is f1, the focal length of the third lens is f3, the on-axis thickness of the first lens is d1, the on-axis distance from the image side surface of the first lens to the object side surface of the second lens is d2, 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 on-axis thickness of the third lens is d5, 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; f3/f is not less than-2.00 and not more than-0.80; d4/d5 is more than or equal to 1.20 and less than or equal to 1.70; d1/d2 is more than or equal to 20.00 and less than or equal to 30.00.
Preferably, the radius of curvature of the object-side surface of the fourth lens is R7, the radius of curvature of the image-side surface of the fourth lens is R8, and the following relation is satisfied: 1.00-5.00 (R7+ R8)/(R7-R8).
Preferably, a curvature radius of an object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, and an optical total length of the imaging optical lens system is TTL and satisfies the following relational expression: -3.62 ≦ (R1+ R2)/(R1-R2) ≦ -0.37; d1/TTL is more than or equal to 0.07 and less than or equal to 0.23.
Preferably, the focal length of the second lens element is f2, 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, the on-axis thickness of the second lens element is d3, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied: f2/f is not less than 1.95 and not more than-0.36; (R3+ R4)/(R3-R4) is not more than 0.03 and not more than 4.02; d3/TTL is more than or equal to 0.01 and less than or equal to 0.05.
Preferably, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, and an optical total length of the imaging optical lens system is TTL and satisfies the following relational expression: 1.22-10.77 of (R5+ R6)/(R5-R6); d5/TTL is more than or equal to 0.02 and less than or equal to 0.08.
Preferably, the focal length of the fourth lens is f4, 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 relation is satisfied: f4/f is more than or equal to 0.70 and less than or equal to 2.94; d7/TTL is more than or equal to 0.03 and less than or equal to 0.20.
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, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied: f5/f is not less than 2.99 and not more than-0.69; -3.85 ≤ (R9+ R10)/(R9-R10) is ≤ 0.71; d9/TTL is more than or equal to 0.01 and less than or equal to 0.06.
Preferably, the effective focal length of the image pickup optical lens is EFL, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: EFL/TTL is more than or equal to 1.11.
Preferably, the F-number of the imaging optical lens is less than or equal to 3.61.
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 0.26 and less than or equal to 1.15.
The invention has the advantages that the pick-up optical lens has good optical performance, has the characteristics of large aperture, long focal length and ultra-thin thickness, and is particularly suitable for a mobile phone pick-up lens component and a WEB pick-up lens which are composed of pick-up elements such as CCD, CMOS and the like for high pixels.
[ 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 of 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 of the 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 of the 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
The invention is further described with reference to the following figures and embodiments.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.
(first embodiment)
Referring to fig. 1 to 4, the present invention provides an image pickup optical lens 10 according to a first embodiment. In fig. 1, the left side is an object side, the right side is an image side, and the imaging optical lens assembly 10 mainly includes five lenses, namely, an aperture stop S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the object side to the image side. A glass flat GF is disposed between the fifth lens L5 and the image plane Si, and the glass flat GF may be a glass cover plate or an optical filter.
In this 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; the fourth lens element L4 has positive refractive power; the fifth lens element L5 has negative refractive power.
Here, the focal length of the entire imaging optical lens is defined as f, the focal length of the first lens is defined as f1, the focal length of the third lens is defined as f3, the on-axis thickness of the first lens is defined as d1, the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is defined as d2, the on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is defined as d4, and the on-axis thickness of the third lens is defined as d5, and the following relational expressions are satisfied:
0.30≤f1/f≤0.50 (1)
-2.00≤f3/f≤-0.80 (2)
1.20≤d4/d5≤1.70 (3)
20.00≤d1/d2≤30.00 (4)
the conditional expression (1) specifies the ratio of the focal length of the first lens to the total focal length of the system, and the spherical aberration and the field curvature of the system can be effectively balanced within the range of the conditional expression.
The conditional expression (2) specifies the ratio of the focal length of the third lens to the total focal length of the system, and within the range of the conditional expression, the system has better imaging quality and lower sensitivity through reasonable distribution of the focal length. Preferably, it satisfies-1.98. ltoreq. f 3/f. ltoreq-0.81.
The conditional expression (3) specifies the ratio of the air space of the second third lens to the thickness of the third lens, and contributes to the reduction of the total length of the optical system within the range of the conditional expression, thereby achieving the effect of making the optical system ultra thin.
The conditional expression (4) specifies the ratio of the thickness of the first lens to the air space of the first and second lenses, and contributes to the total length of the optical system to be reduced within the range of the conditional expression, thereby achieving the effect of making the optical system ultra-thin. Preferably, 20.29. ltoreq. d1/d 2. ltoreq.29.63 is satisfied.
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), and the shape of the fourth lens is regulated, so that 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. Preferably, 1.10. ltoreq. (R7+ R8)/(R7-R8). ltoreq.4.97 is satisfied.
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: -3.62 ≦ (R1+ R2)/(R1-R2) ≦ -0.37, and the shape of the first lens is appropriately controlled so that the first lens can effectively correct the system spherical aberration, preferably, satisfying-2.26 ≦ (R1+ R2)/(R1-R2) ≦ -0.46.
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 relationships are satisfied: d1/TTL is more than or equal to 0.07 and less than or equal to 0.23, and ultra-thinning is facilitated. Preferably, 0.11. ltoreq. d 1/TTL. ltoreq.0.19 is satisfied.
Defining the focal length of the whole imaging optical lens as f, the focal length of the second lens L2 as f2, and satisfying the following relation: 1.95 ≦ f2/f ≦ -0.36, which is advantageous for correcting aberrations of the optical system by controlling the negative power of the second lens L2 in a reasonable range. Preferably, it satisfies-1.22. ltoreq. f 2/f. ltoreq-0.45.
The curvature radius of the object side surface of the second lens L2 is R3, the curvature radius of the image side surface of the second lens L2 is R4, and the following relations are satisfied: the second lens L2 is defined to have a shape of 0.03 ≦ (R3+ R4)/(R3-R4) ≦ 4.02, and is advantageous for correcting the chromatic aberration on the axis when the shape is within the range. Preferably, 0.05 ≦ (R3+ R4)/(R3-R4) ≦ 3.22 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 relationships are satisfied: d3/TTL is more than or equal to 0.01 and less than or equal to 0.05, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 3/TTL. ltoreq.0.04 is satisfied.
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: 1.22 ≦ (R5+ R6)/(R5-R6) ≦ 10.77, and defines the shape of the third lens, and within the range defined by the conditional expression, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, 1.96 ≦ (R5+ R6)/(R5-R6) ≦ 8.62.
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 relationships are satisfied: d5/TTL is more than or equal to 0.02 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 5/TTL. ltoreq.0.06 is satisfied.
The focal length of the entire imaging optical lens is defined as f, the focal length of the fourth lens L4 is defined as f4, and the following relational expression is satisfied: f4/f is more than or equal to 0.70 and less than or equal to 2.94, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 1.12. ltoreq. f 4/f. ltoreq.2.36 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 relationships are satisfied: d7/TTL is more than or equal to 0.03 and less than or equal to 0.20, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 7/TTL. ltoreq.0.16 is satisfied.
The focal length of the whole imaging optical lens is defined as f, the focal length of the fifth lens L5 is defined as f5, and the following relational expression is satisfied: f5/f is more than or equal to 2.99 and less than or equal to-0.69, and the definition of the fifth lens L5 can effectively make the light angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, it satisfies-1.87. ltoreq. f 5/f. ltoreq-0.86.
The curvature radius of the object-side surface of the fifth lens L5 is R9, and the curvature radius of the image-side surface of the fifth lens L5 is R10, and the following relationships are satisfied: -3.85 ≦ (R9+ R10)/(R9-R10) ≦ -0.71, defines the shape of the fifth lens L5, and is advantageous for correcting the aberration of the off-axis view angle and the like when within the range. Preferably, it satisfies-2.41 ≦ (R9+ R10)/(R9-R10). ltoreq.0.88.
The on-axis thickness of the fifth lens L5 is d9, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d9/TTL is more than or equal to 0.01 and less than or equal to 0.06, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 9/TTL. ltoreq.0.05 is satisfied.
In this embodiment, the ratio between the effective focal length EFL and the total optical length TTL of the image pickup optical lens 10 is greater than or equal to 1.11, which is beneficial to achieving ultra-thinning.
In this embodiment, the combined focal length of the first lens L1 and the second lens L2 is defined as f12, and the following relation is satisfied: f12/f is more than or equal to 0.26 and less than or equal to 1.15, and within the range of the conditional expression, the aberration and distortion of the image pickup optical lens 10 can be eliminated, and the back focal length of the image pickup optical lens 10 can be suppressed, so as to maintain the miniaturization of the image lens system. Preferably, 0.42. ltoreq. f 12/f. ltoreq.0.92 is satisfied.
In the present embodiment, the F-number Fno of the imaging optical lens 10 is 3.61 or less. The large aperture is large, and the imaging performance is good. Preferably, Fno is less than or equal to 3.54.
In addition, in the imaging optical lens 10 provided in the present embodiment, the surface of each lens can be an aspheric surface, which is easy to be made into a shape other than a spherical surface, so as to obtain more control variables for reducing the aberration and further reducing the number of lenses used, thereby effectively reducing the total length of the imaging optical lens 10. In the present embodiment, both the object-side surface and the image-side surface of each lens are aspheric.
It is to be noted that since the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 have the structure and the parameter relationship as described above, the image-taking optical lens 10 can reasonably distribute the power, the interval, and the shape of each lens, and thus correct various kinds of aberrations.
In this way, the imaging optical lens 10 can satisfy design requirements of a long focal length and an ultra-thin structure while having good optical imaging performance.
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 is the total optical length (on-axis distance from the object side surface of the first lens L1 to the image plane Si) in mm.
In addition, at least one of the object-side surface and the image-side surface of each lens may further have an inflection point and/or a stagnation point, so as to meet the requirement of high-quality imaging.
The following shows design data of the image pickup optical lens 10 shown in fig. 1.
Table 1 shows the object-side and image-side radii of curvature R, the on-axis thicknesses of the respective lenses, the distance d between the adjacent lenses, the refractive index nd, and the abbe number ν d of the first lens L1 to the fifth lens L5 constituting the imaging optical lens 10 according to the first embodiment of the present invention. In the present embodiment, R and d are both expressed in units of millimeters (mm).
[ TABLE 1 ]
The meanings of the symbols in the above table are as follows.
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 ]
In table 2, k is a conic coefficient, and a4, a6, A8, a10, a12, a14, a16 are aspherical coefficients.
IH: image height
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 the stagnation point design data of each lens in the imaging optical lens 10 of the present embodiment. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, and P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, respectively. The "inflection point position" field correspondence data is a vertical distance from an inflection point set on each lens surface to the optical axis of the image pickup optical lens 10. The "stagnation point position" field corresponding data is the vertical distance from the stagnation point set on each lens surface to the optical axis of the imaging optical lens 10.
[ TABLE 3 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | |
| |
0 | ||
| P1R2 | 2 | 0.615 | 1.645 |
| P2R1 | 2 | 0.395 | 1.455 |
| P2R2 | 1 | 1.405 | |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| P4R2 | 1 | 1.335 | |
| P5R1 | 1 | 1.325 | |
| |
0 |
[ TABLE 4 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| |
0 | ||
| P1R2 | 1 | 1.025 | |
| P2R1 | 2 | 0.755 | 1.635 |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 |
Table 13 below also lists values corresponding to the various parameters in the first, second, and third embodiments and the parameters specified in the conditional expressions.
As shown in table 13, the first embodiment satisfies each conditional expression.
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 passing through the imaging optical lens 10, respectively. 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. The field curvature S in fig. 4 is a field curvature in the sagittal direction, and T is a field curvature in the meridional direction.
In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter of 4.128mm, a full field image height of 2.502mm, and a diagonal field angle of 19.51 °, so that the imaging optical lens 10 has a large aperture, a long focal length, and a thin profile, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
(second embodiment)
Fig. 5 is a schematic structural diagram of the imaging optical lens 20 in the second embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the same parts are not described herein again, and only different points are listed below.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
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 inflected point and stagnation point design data of each lens in the imaging optical lens 20.
[ TABLE 7 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | |
| |
0 | ||
| P1R2 | 2 | 0.535 | 1.745 |
| P2R1 | 2 | 0.505 | 1.645 |
| P2R2 | 1 | 1.525 | |
| |
0 | ||
| P3R2 | 1 | 1.205 | |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 |
[ TABLE 8 ]
Table 13 below also lists values corresponding to various parameters in the second embodiment and parameters already defined in the conditional expressions. Obviously, the imaging optical lens of the present embodiment satisfies the above conditional expressions.
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, respectively. 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. The field curvature S in fig. 8 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.
In the present embodiment, the imaging optical lens 20 has an entrance pupil diameter of 4.176mm, a full field image height of 2.502mm, and a diagonal field angle of 19.55 °, so that the imaging optical lens 20 has a large aperture, a long focal length, and a thin profile, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
(third embodiment)
Fig. 9 is a schematic structural diagram of an imaging optical lens 30 according to a third embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the same parts are not described again, and only different points are listed below.
Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
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 inflected point and stagnation point design data of each lens in the imaging optical lens 30.
[ TABLE 11 ]
[ TABLE 12 ]
| Number of stagnation points | |
| P1R1 | 0 |
| |
0 |
| |
0 |
| |
0 |
| |
0 |
| |
0 |
| |
0 |
| |
0 |
| |
0 |
| |
0 |
Table 13 below also lists values corresponding to various parameters in the third embodiment and parameters already defined in the conditional expressions. Obviously, the imaging optical lens of the present embodiment satisfies the above conditional expressions.
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, respectively. 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. The field curvature S in fig. 12 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.
In the present embodiment, the imaging optical lens 30 has an entrance pupil diameter of 4.071mm, a full field image height of 2.502mm, and a diagonal field angle of 20.04 °, so that the imaging optical lens 30 has a large aperture, a long focal length, and a thin profile, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
Table 13 below lists the values of the conditional expressions in the first embodiment, the second embodiment, and the third embodiment, and values of other relevant parameters according to the conditional expressions.
[ TABLE 13 ]
| Parameter and condition formula | Example 1 | Example 2 | Example 3 |
| f1/f | 0.39 | 0.31 | 0.49 |
| f3/f | -1.20 | -0.82 | -1.95 |
| d4/d5 | 1.46 | 1.69 | 1.23 |
| d1/d2 | 24.28 | 20.57 | 29.26 |
| f | 14.450 | 14.617 | 14.248 |
| f1 | 5.677 | 4.458 | 6.982 |
| f2 | -10.114 | -7.923 | -13.922 |
| f3 | -17.286 | -11.987 | -27.784 |
| f4 | 20.205 | 24.063 | 27.968 |
| f5 | -16.616 | -15.049 | -21.284 |
| f12 | 9.621 | 7.671 | 10.916 |
| Fno | 3.50 | 3.50 | 3.50 |
Where Fno is the F-number of the diaphragm of the imaging optical lens.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (10)
1. An imaging optical lens, comprising five lenses, in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power;
wherein a focal length of the entire imaging optical lens is f, a focal length of the first lens is f1, a focal length of the third lens is f3, an on-axis thickness of the first lens is d1, an on-axis distance from an image-side surface of the first lens to an object-side surface of the second lens is d2, an on-axis distance from an image-side surface of the second lens to an object-side surface of the third lens is d4, an on-axis thickness of the third lens is d5, a curvature radius of an object-side surface of the third lens is R5, a curvature radius of an image-side surface of the third lens is R6, and the following relational expressions are satisfied:
0.30≤f1/f≤0.50；
-2.00≤f3/f≤-0.80；
1.20≤d4/d5≤1.70；
20.00≤d1/d2≤30.00；
1.22≤(R5+R6)/(R5-R6)≤10.77。
2. the imaging optical lens according to claim 1, wherein a radius of curvature of an object-side surface of the fourth lens is R7, a radius of curvature of an image-side surface of the fourth lens is R8, and the following relational expression is satisfied:
1.00≤(R7+R8)/(R7-R8)≤5.00。
3. the imaging optical lens of claim 1, wherein a radius of curvature of an object-side surface of the first lens element is R1, a radius of curvature of an image-side surface of the first lens element is R2, and an optical total length of the imaging optical lens is TTL and satisfies the following relationship:
-3.62≤(R1+R2)/(R1-R2)≤-0.37；
0.07≤d1/TTL≤0.23。
4. the imaging optical lens of claim 1, wherein the focal length of the second lens is f2, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, the on-axis thickness of the second lens is d3, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
-1.95≤f2/f≤-0.36；
0.03≤(R3+R4)/(R3-R4)≤4.02；
0.01≤d3/TTL≤0.05。
5. 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:
0.02≤d5/TTL≤0.08。
6. the image-capturing optical lens unit according to claim 1, wherein the focal length of the fourth lens element is f4, the on-axis thickness of the fourth lens element is d7, the total optical length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
0.70≤f4/f≤2.94；
0.03≤d7/TTL≤0.20。
7. the imaging optical lens of 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, 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, the total optical length of the imaging optical lens element is TTL, and the following relationship is satisfied:
-2.99≤f5/f≤-0.69；
-3.85≤(R9+R10)/(R9-R10)≤-0.71；
0.01≤d9/TTL≤0.06。
8. the image-capturing optical lens system according to claim 1, wherein the effective focal length of the image-capturing optical lens system is EFL, the total optical length of the image-capturing optical lens system is TTL, and the following relationship is satisfied:
EFL/TTL≥1.11。
9. a camera optical lens according to claim 1, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 3.61.
10. 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: f12/f is more than or equal to 0.26 and less than or equal to 1.15.
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