CN111025545B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111025545B CN111025545B CN201911335296.1A CN201911335296A CN111025545B CN 111025545 B CN111025545 B CN 111025545B CN 201911335296 A CN201911335296 A CN 201911335296A CN 111025545 B CN111025545 B CN 111025545B
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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
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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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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, a second lens, a third lens, a fourth lens, and a fifth lens; the following relation is satisfied: BF/TTL is more than or equal to 0.40 and less than or equal to 0.60; d7/d5 is more than or equal to 3.50 and less than or equal to 8.00. The photographic optical lens can achieve high imaging performance and meet the design requirements of large aperture, wide angle and ultra-thinness.
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 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) Device, and due to the refinement of Semiconductor manufacturing technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed in a form of being excellent in function, light, thin, short and small, 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. 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, five-piece, six-piece and seven-piece lens structures gradually appear in the design of the lens. However, since the conventional configuration has a problem that the lens has an insufficient long focal length due to insufficient distribution of refractive power and insufficient setting of lens thickness and shape, a wide-angle imaging lens having excellent optical characteristics, being ultra-thin, and sufficiently correcting chromatic aberration is strongly required.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an imaging optical lens that can satisfy the requirements of a large aperture, an ultra-thin thickness, and a wide angle while achieving high imaging performance.
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, a second lens, a third lens, a fourth lens and a fifth lens;
the on-axis thickness of the third lens is d5, the on-axis thickness of the fourth lens is d7, the on-axis distance from the image side surface of the fifth lens to the image surface is BF, the total optical length of the shooting optical lens is TTL, and the following relational expression is satisfied:
0.40≤BF/TTL≤0.60；
3.50≤d7/d5≤8.00。
preferably, 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, which satisfy the following relationships:
-6.00≤R10/R9≤-1.50。
preferably, the focal length of the fifth lens element is f5, the focal length of the imaging optical lens element is f, and the following relationship is satisfied:
1.00≤f5/f≤2.00。
preferably, the focal length of the first lens is f1, the focal length of the imaging optical lens is f, 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 following relationships are satisfied:
-21.59≤f1/f≤-1.58；
-17.98≤(R1+R2)/(R1-R2)≤3.93；
0.01≤d1/TTL≤0.08。
preferably, the focal length of the second lens element is f2, the focal length of the image-capturing optical lens element is f, the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the image-side surface of the second lens element is R4, the on-axis thickness of the first lens element is d3, the total optical length of the image-capturing optical lens element is TTL, and the following relationships are satisfied:
0.59≤f2/f≤3.11；
-7.07≤(R3+R4)/(R3-R4)≤-0.42；
0.01≤d3/TTL≤0.05。
preferably, the focal length of the third lens element is f3, the focal length of the image-capturing optical lens element is f, the radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, the on-axis thickness of the third lens element is d5, the total optical length of the image-capturing optical lens element is TTL, and the following relationships are satisfied:
-1.16≤f3/f≤-0.36；
0.19≤(R5+R6)/(R5-R6)≤1.02；
0.01≤d5/TTL≤0.04。
preferably, the focal length of the fourth lens element is f4, the focal length of the image-capturing optical lens element is f, the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, the total optical length of the image-capturing optical lens element is TTL, and the following relationships are satisfied:
0.40≤f4/f≤2.15；
0.33≤(R7+R8)/(R7-R8)≤2.40；
0.05≤d7/TTL≤0.30。
preferably, the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship:
-1.43≤(R9+R10)/(R9-R10)≤-0.14；
0.03≤d9/TTL≤0.39。
preferably, the combined focal length of the first lens and the second lens is f12, and the following relation is satisfied:
1.18≤f12/f≤4.32。
preferably, the F-number of the imaging optical lens is less than or equal to 2.63.
The invention has the advantages that the shooting optical lens has excellent optical characteristics, has the characteristics of large aperture, wide angle and ultra-thin thickness, and is particularly suitable for mobile phone camera lens components and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements.
Drawings
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 shown in fig. 9.
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 five lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: a diaphragm S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. An optical element such as an optical filter (filter) GF may be disposed between the fifth lens L5 and the image plane Si.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all made of plastic materials.
The total optical length of the image pickup optical lens is defined as TTL, the axial distance from the image side surface of the fifth lens L5 to the image surface is BF, BF/TTL is not less than 0.40 and not more than 0.60, the ratio of the axial distance BF from the image side surface of the fifth lens L5 to the image surface to the total optical length TTL of the image pickup optical lens is specified, and the lens and the electronic device can be assembled conveniently. Preferably, 0.41. ltoreq. BF/TTL. ltoreq.0.60.
The on-axis thickness of the third lens L3 is defined as d5, the on-axis thickness of the fourth lens L4 is defined as d7, d7/d5 is not less than 3.50 and not more than 8.00, and the ratio of the on-axis thickness d7 of the fourth lens L4 to the on-axis thickness d7 of the fourth lens L4 is defined, so that lens assembly is facilitated. Preferably, 3.53. ltoreq. d7/d 5. ltoreq.7.98.
The curvature radius of the object side surface of the fifth lens L5 is defined as R9, the curvature radius of the image side surface of the fifth lens L5 is defined as R10, -6.00-R10/R9-1.50, and the shape of the fifth lens L5 is defined, so that the deflection degree of light rays passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, -5.99. ltoreq. R10/R9. ltoreq. 1.51.
Defining the focal length of the fifth lens L5 as f5, the focal length of the image pickup optical lens as f, wherein f5/f is more than or equal to 1.00 and less than or equal to 2.00, and defining the ratio of the focal length f5 of the fifth lens L5 to the system focal length f, contributes to improving the optical system performance within the conditional expression range. Preferably, 1.01. ltoreq. f 5/f. ltoreq.1.99.
The total optical length of the imaging optical lens 10 is defined as TTL.
When the focal length of the image pickup optical lens 10, the focal lengths of the respective lenses, the refractive indices of the respective lenses, the optical total length of the image pickup optical lens, the on-axis thickness, and the curvature radius satisfy the above-described relational expressions, the image pickup optical lens 10 can have high performance and meet the design requirement of low TTL.
In this embodiment, the first lens element L1 has negative refractive power.
The focal length of the entire image pickup optical lens 10 is f, the focal length of the first lens L1 is f1, and the following relations are satisfied: 21.59. ltoreq. f 1/f. ltoreq. 1.58, specifying the ratio of the focal length f1 of the first lens L1 to the overall focal length. 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. Preferably, it satisfies-13.49. ltoreq. f 1/f. ltoreq-1.98.
The curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the following relations: the shape of the first lens L1 is defined to be (R1+ R2)/(R1-R2) to be (R) 17.98 or less and (R1+ R2)/(R1-R2) or less and the problem of chromatic aberration on the axis is favorably corrected as the lens becomes thinner and wider in angle within the range defined by the conditional expression. Preferably, -11.24 ≦ (R1+ R2)/(R1-R2). ltoreq.3.15.
The first lens L1 has an on-axis thickness d1, and satisfies the following relationship: d1/TTL is more than or equal to 0.01 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 1/TTL. ltoreq.0.06.
In this embodiment, the object-side surface of the second lens element L2 is convex at the paraxial region and has positive refractive power.
The focal length of the second lens L2 is f2, and the following relation is satisfied: f2/f is more than or equal to 0.59 and less than or equal to 3.11, and the positive focal power of the second lens L2 is controlled in a reasonable range, so that the aberration of the optical system can be corrected. Preferably, 0.94. ltoreq. f 2/f. ltoreq.2.49 is satisfied.
The curvature radius R3 of the object side surface of the second lens L2 and the curvature radius R4 of the image side surface of the second lens L2 satisfy the following relations: the second lens L2 is defined to have a shape of 7.07 ≦ (R3+ R4)/(R3-R4) ≦ -0.42, and the problem of chromatic aberration on the axis is favorably corrected as the lens is brought to an ultra-thin wide angle in the range. Preferably, -4.42 ≦ (R3+ R4)/(R3-R4) ≦ -0.52.
The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: 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.
In this embodiment, the object-side surface of the third lens element L3 is concave in the paraxial region thereof, and the image-side surface thereof is concave in the paraxial region thereof, and has negative refractive power.
The third lens L3 has a focal length f3, and satisfies the following relationship: -1.16 ≦ f3/f ≦ -0.36, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, -0.73. ltoreq. f 3/f. ltoreq-0.45.
The curvature radius R5 of the object side surface of the third lens L3 and the curvature radius R6 of the image side surface of the third lens L3 satisfy the following relations: the shape of the third lens is more than or equal to 0.19 and less than or equal to (R5+ R6)/(R5-R6) and less than or equal to 1.02, and the deflection degree of light rays passing through the lens can be alleviated within the range specified by the conditional expression, so that the aberration can be effectively reduced. Preferably, 0.31 ≦ (R3+ R4)/(R3-R4). ltoreq.0.81.
The on-axis thickness of the third lens L3 is d5, and satisfies the following relation: d5/TTL is more than or equal to 0.01 and less than or equal to 0.04, which is beneficial to realizing ultra-thinning. Preferably, 0.02. ltoreq. d 5/TTL. ltoreq.0.03.
In this embodiment, the image-side surface of the fourth lens element L4 is convex at the paraxial region and has positive refractive power.
The focal length f4 of the fourth lens L4 satisfies the following relation: f4/f is more than or equal to 0.40 and less than or equal to 2.15, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 0.64. ltoreq. f 4/f. ltoreq.1.72.
The curvature radius R7 of the object side surface of the fourth lens L4 and the curvature radius R8 of the image side surface of the fourth lens L4 satisfy the following relations: the (R7+ R8)/(R7-R8) is 0.33 or more and 2.40 or less, and the shape of the fourth lens L4 is defined so that the problem such as aberration of the off-axis angle can be corrected with the development of an ultra-thin wide angle when the shape is within the range. Preferably, 0.53 ≦ (R7+ R8)/(R7-R8). ltoreq.1.92.
The on-axis thickness of the fourth lens L4 is d7, and satisfies the following relation: d7/TTL is more than or equal to 0.05 and less than or equal to 0.30, and ultra-thinning is facilitated. Preferably, 0.07. ltoreq. d 7/TTL. ltoreq.0.24.
In this embodiment, the object-side surface of the fifth lens element L5 is convex at the paraxial region thereof, and the image-side surface thereof is convex at the paraxial region thereof, and has positive refractive power.
The curvature radius R9 of the object side surface of the fifth lens L5 and the curvature radius R10 of the image side surface of the fifth lens L5 satisfy the following relations: -1.43 ≦ (R9+ R10)/(R9-R10) ≦ -0.14, and the shape of the fifth lens L5 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, -0.89 ≦ (R9+ R10)/(R9-R10) ≦ -0.17.
The fifth lens L5 has an on-axis thickness d9, and satisfies the following relationship: d9/TTL is more than or equal to 0.03 and less than or equal to 0.39, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 9/TTL. ltoreq.0.32.
Defining a combined focal length f12 of the first lens L1 and the second lens L2, satisfying the following relation: f12/f is more than or equal to 1.18 and less than or equal to 4.32, 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, 1.88. ltoreq. f 12/f. ltoreq.3.45.
In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.63 or less. The large aperture is large, and the imaging performance is good.
With such a design, the total optical length TTL of the entire imaging optical lens 10 can be made as short as possible, and the characteristic of miniaturization can be maintained.
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 of the camera optical lens, and the unit is 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: an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6;
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.
IH image height
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 |
|
| P1R1 | 1 | 0.575 | |
| |
2 | 0.545 | 0.775 |
| P2R1 | |||
| P2R2 | 1 | 0.755 | |
| |
2 | 0.775 | 0.995 |
| P3R2 | 1 | 0.245 | |
| P4R1 | 1 | 0.605 | |
| |
2 | 1.415 | 1.725 |
| P5R1 | 1 | 2.245 | |
| |
2 | 1.405 | 2.165 |
[ TABLE 4 ]
| Number of stagnation points | Location of stagnation 1 | Location of |
|
| P1R1 | |||
| P1R2 | 1 | 0.715 | |
| | |||
| P2R2 | |||
| P3R1 | |||
| 2 | 0.965 | 0.995 | |
| P3R2 | 1 | 0.495 | |
| P4R1 | 1 | 0.915 | |
| P4R2 | |||
| P5R1 | |||
| P5R2 |
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberrations of magnification of light having wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing the field curvature and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 10 according to the first embodiment, where the field curvature S in fig. 4 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.
Table 13 shown later shows values of various numerical values in examples 1, 2, and 3 corresponding to the parameters specified in the conditional expressions.
As shown in table 13, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.398mm, a full field image height of 2.590mm, a diagonal field angle of 71.20 °, a wide angle, and a high profile, 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.
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 |
Position of |
|
| | ||||
| P1R2 | ||||
| 2 | 0.485 | 0.745 | ||
| P2R1 | ||||
| P2R2 | 1 | 0.505 | ||
| |
2 | 0.915 | 1.125 | |
| |
3 | 0.275 | 0.995 | 1.375 |
| |
2 | 0.655 | 1.685 | |
| |
2 | 1.445 | 1.865 | |
| P5R1 | ||||
| P5R2 | 1 | 2.225 |
[ TABLE 8 ]
| Number of stagnation points | Location of stagnation 1 | Location of |
|
| P1R1 | |||
| P1R2 | |||
| P2R1 | |||
| P2R2 | 1 | 0.635 | |
| P3R1 | |||
| P3R2 | 1 | 0.605 | |
| |
2 | 1.115 | 1.785 |
| |
2 | 1.835 | 1.875 |
| P5R1 | |||
| P5R2 |
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberrations of magnification of light having wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm 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 546nm after passing through the imaging optical lens 20 according to the second embodiment.
As shown in table 13, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.404mm, a full field height of 2.590mm, a diagonal field angle of 70.80 °, a wide angle, and a high 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.
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 |
|
| |
2 | 0.315 | 0.485 | |
| |
2 | 0.195 | 0.465 | |
| P2R1 | ||||
| P2R2 | ||||
| P3R1 | ||||
| P3R2 | 1 | 0.245 | ||
| P4R1 | ||||
| P4R2 | 1 | 1.345 | ||
| |
3 | 0.415 | 1.025 | 1.825 |
| |
2 | 1.155 | 1.815 |
[ TABLE 12 ]
Fig. 10 and 11 are schematic diagrams showing axial aberration and chromatic aberration of magnification after light having wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm passes 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 546nm after passing through the imaging optical lens 30 according to the third embodiment.
Table 13 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment, in accordance with the conditional expressions described above. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.404mm, a full field height of 2.590mm, a diagonal field angle of 71.10 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 13 ]
| Parameter and condition formula | Example 1 | Example 2 | Example 3 |
| f | 3.565 | 3.580 | 3.580 |
| f1 | -8.455 | -38.647 | -11.729 |
| f2 | 4.194 | 7.434 | 5.570 |
| f3 | -1.909 | -1.986 | -2.079 |
| f4 | 2.835 | 5.132 | 2.951 |
| f5 | 6.723 | 3.616 | 7.124 |
| f12 | 8.697 | 8.426 | 10.306 |
| FNO | 2.60 | 2.50 | 2.50 |
| BF/TTL | 0.55 | 0.41 | 0.59 |
| d7/d5 | 6.16 | 3.51 | 7.97 |
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, a second lens, a third lens, a fourth lens and a fifth lens; the first lens element with negative refractive power, the second lens element with positive refractive power, the third lens element with negative refractive power, the fourth lens element with positive refractive power, and the fifth lens element with positive refractive power;
the on-axis thickness of the third lens is d5, the on-axis thickness of the fourth lens is d7, the on-axis distance from the image side surface of the fifth lens to the image surface is BF, the curvature radius of the object side surface of the fifth lens is R9, the curvature radius of the image side surface of the fifth lens is R10, the total optical length of the photographic optical lens is TTL, and the following relational expression is satisfied:
0.40≤BF/TTL≤0.60；
3.50≤d7/d5≤8.00；
-6.00≤R10/R9≤-1.50。
2. the image-pickup optical lens according to claim 1, wherein a focal length of the fifth lens element is f5, a focal length of the image-pickup optical lens is f, and the following relationship is satisfied:
1.00≤f5/f≤2.00。
3. the imaging optical lens according to claim 1, wherein the first lens has a focal length of f1, the imaging optical lens has a focal length of f, the first lens has an object-side surface with a radius of curvature of R1, the first lens has an image-side surface with a radius of curvature of R2, the first lens has an on-axis thickness of d1, and the following relationship is satisfied:
-21.59≤f1/f≤-1.58；
-17.98≤(R1+R2)/(R1-R2)≤3.93；
0.01≤d1/TTL≤0.08。
4. the imaging optical lens according to claim 1, wherein the second lens has a focal length of f2, the imaging optical lens has a focal length of f, the second lens has a radius of curvature of the object-side surface of R3, the second lens has a radius of curvature of the image-side surface of R4, the first lens has an on-axis thickness of d3, and the following relationship is satisfied:
0.59≤f2/f≤3.11；
-7.07≤(R3+R4)/(R3-R4)≤-0.42；
0.01≤d3/TTL≤0.05。
5. the imaging optical lens of claim 1, wherein the third lens has a focal length of f3, the imaging optical lens has a focal length of f, the third lens has a radius of curvature of the object-side surface of R5, the third lens has a radius of curvature of the image-side surface of R6, and the following relationships are satisfied:
-1.16≤f3/f≤-0.36；
0.19≤(R5+R6)/(R5-R6)≤1.02；
0.01≤d5/TTL≤0.04。
6. the imaging optical lens of claim 1, wherein the focal length of the fourth lens element is f4, the focal length of the imaging optical lens is f, 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 relationships are satisfied:
0.40≤f4/f≤2.15；
0.33≤(R7+R8)/(R7-R8)≤2.40；
0.05≤d7/TTL≤0.30。
7. the imaging optical lens according to claim 1, wherein a radius of curvature of the object-side surface of the fifth lens is R9, a radius of curvature of the image-side surface of the fifth lens is R10, an on-axis thickness of the fifth lens is d9, and the following relationship is satisfied:
-1.43≤(R9+R10)/(R9-R10)≤-0.14；
0.03≤d9/TTL≤0.39。
8. an image-pickup optical lens according to claim 1, wherein a combined focal length of the first lens and the second lens is f12, and the following relation is satisfied:
1.18≤f12/f≤4.32。
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 2.63.
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