CN111007632B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111007632B CN111007632B CN201911340777.1A CN201911340777A CN111007632B CN 111007632 B CN111007632 B CN 111007632B CN 201911340777 A CN201911340777 A CN 201911340777A CN 111007632 B CN111007632 B CN 111007632B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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, a fifth lens, a sixth lens, and a seventh lens; and satisfies the following relationships: f1/f is more than or equal to-3.00 and less than or equal to-1.00; less than or equal to 15.00 (R3+ R4)/(R3-R4) less than or equal to 1.50; R7/R8 is more than or equal to-3.00 and less than or equal to-1.00; d2/d3 is more than or equal to 1.50 and less than or equal to 5.00. The imaging optical lens of the invention has good optical performance such as wide angle, large aperture and ultra-thin.
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 with a good function, a light weight, a small size, and a light weight, and thus, 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. An ultra-thin wide-angle imaging optical lens having excellent optical characteristics is urgently 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 ultra-thinning and 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, a fifth lens, a sixth lens, and a seventh lens;
the imaging optical lens system comprises an imaging optical lens, a first lens, a second lens, a third lens, a fourth lens and a fourth lens, wherein the focal length of the imaging optical lens is f, the focal length of the first lens is f1, the object-side radius of curvature of the second lens is R3, the image-side radius of curvature of the second lens is R4, the object-side radius of curvature of the fourth lens is R7, the image-side radius of curvature of the fourth lens is R8, the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, and the on-axis thickness of the second lens is d3, and the following relations are satisfied:
-3.00≤f1/f≤-1.00；
-15.00≤(R3+R4)/(R3-R4)≤-1.50；
-3.00≤R7/R8≤-1.00；
1.50≤d2/d3≤5.00。
preferably, the focal length of the sixth lens is f6, and the following relation is satisfied:
1.20≤f6/f≤3.00。
preferably, the curvature radius of the object-side surface of the first lens element is R1, the curvature radius of the image-side surface of the first lens element is R2, the on-axis thickness of the first lens element is d1, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship:
0.47≤(R1+R2)/(R1-R2)≤2.03；
0.03≤d1/TTL≤0.14。
preferably, the focal length of the second lens element is f2, the total optical length of the image pickup optical lens is TTL, and the following relationship is satisfied:
1.16≤f2/f≤27.30；
0.02≤d3/TTL≤0.14。
preferably, the focal length of the third lens element is f3, 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, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationships:
2.20≤f3/f≤56.95；
-848.77≤(R5+R6)/(R5-R6)≤-4.07；
0.03≤d5/TTL≤0.11。
preferably, 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 imaging optical lens is TTL, and the following relationship is satisfied:
0.56≤f4/f≤2.97；
0.01≤(R7+R8)/(R7-R8)≤0.74；
0.06≤d7/TTL≤0.25。
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 assembly is TTL, and the following relationships are satisfied:
-9.02≤f5/f≤-1.27；
-3.01≤(R9+R10)/(R9-R10)≤-0.04；
0.02≤d9/TTL≤0.07。
preferably, the curvature radius of the object-side surface of the sixth lens element is R11, the curvature radius of the image-side surface of the sixth lens element is R12, the on-axis thickness of the sixth lens element is d11, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship:
-0.49≤(R11+R12)/(R11-R12)≤0.93；
0.04≤d11/TTL≤0.22。
preferably, the focal length of the seventh lens element is f7, the curvature radius of the object-side surface of the seventh lens element is R13, the curvature radius of the image-side surface of the seventh lens element is R14, the on-axis thickness of the seventh lens element is d13, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied:
-47.51≤f7/f≤-1.59；
1.50≤(R13+R14)/(R13-R14)≤16.38；
0.03≤d13/TTL≤0.13。
preferably, the combined focal length of the first lens and the second lens is f12, and the following relation is satisfied:
-8.73≤f12/f≤-1.31。
the invention has the beneficial effects that: the imaging optical lens according to the present invention satisfies good optical performance such as a large aperture, a wide angle, and an ultra-thin film, and is particularly suitable for a mobile phone imaging lens unit and a WEB imaging lens which are constituted by imaging elements such as a CCD and a CMOS for high pixel.
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 of FIG. 9;
fig. 13 is a schematic configuration diagram of an imaging 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 image pickup optical lens 10 according to a first embodiment of the present invention, and the image pickup optical lens 10 includes seven lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: a first lens L1, a second lens L2, a third lens L3, a stop S1, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. An optical element such as an optical filter (filter) GF may be disposed between the seventh lens L7 and the image plane Si.
Defining the focal length f of the whole image pickup optical lens 10, the focal length f1 of the first lens L1, f1/f, and f 1.00, of the whole image pickup optical lens, and by defining the ratio of the focal length f1 of the first lens L1 to the focal length f of the image pickup optical lens 10, in the range defined by the conditional expression, the field of view is increased.
The object side curvature radius of the second lens L2 is defined as R3, the image side curvature radius of the second lens L2 is defined as R4, -15.00 ≦ (R3+ R4)/(R3-R4) ≦ -1.50, and by defining the shape of the second lens L2, the deflection degree of light rays passing through the lens can be alleviated within the range defined by the conditional expression, and the aberration can be effectively reduced.
The object side curvature radius of the fourth lens L4 is defined as R7, the image side curvature radius of the fourth lens L4 is defined as R8, -3.00 < R7/R8 < 1.00, and the shape of the fourth lens L4 can be effectively controlled within the range specified by the conditional expression, so that the imaging performance is improved.
The axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2 is defined as d2, the axial thickness of the second lens L2 is defined as d3, 1.50 is not less than d2/d3 is not less than 5.00, the ratio of the air spacing distance between the first lens L1 and the second lens L2 to the axial thickness of the second lens L2 is defined, and the processing of the lens and the assembly of the lens are facilitated within the conditional expression specified range.
When the focal length of the image pickup optical lens 10, the focal length of each lens, the on-axis distance from the image side surface to the object side surface of the relevant lens, and the on-axis thickness satisfy the above-mentioned relational expressions, the image pickup optical lens 10 can have good optical performance of wide angle, large aperture and ultra-thin.
The focal length of the sixth lens L6 is f6, f6/f is not less than 1.20 and not more than 3.00, the ratio of the focal length of the sixth lens L6 to the focal length of the imaging optical lens 10 is specified, and the focal length is in the range specified by the conditional expression, so that the field curvature correction is facilitated, and the image quality is improved.
The curvature radius of the object side surface of the first lens L1 is R1, the curvature radius of the image side surface of the first lens L1 is R2, 0.47 ≦ (R1+ R2)/(R1-R2) ≦ 2.03, and the shape of the first lens L1 is defined, so that the first lens L1 can effectively correct the system spherical aberration within the range defined by the conditional expression. Preferably, 0.76. ltoreq. (R1+ R2)/(R1-R2). ltoreq.1.62 is satisfied.
The on-axis thickness of the first lens L1 is d1, the total optical length of the photographic optical lens 10 is TTL, and d1/TTL is not less than 0.03 and not more than 0.14, which is beneficial to realizing ultra-thinning. Preferably, 0.04. ltoreq. d 1/TTL. ltoreq.0.12 is satisfied.
The focal length of the second lens is f2, f2/f is more than or equal to 1.16 and less than or equal to 27.3, 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, 1.86. ltoreq. f 2/f. ltoreq.21.84 is satisfied.
The on-axis thickness of the second lens is d3, d3/TTL is more than or equal to 0.02 and less than or equal to 0.14, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.11 is satisfied.
The focal length of the third lens is f3, f3/f is more than or equal to 2.20 and less than or equal to 56.95, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 3.51. ltoreq. f 3/f. ltoreq. 45.56 is satisfied.
The curvature radius of the object side surface of the third lens is R5, the curvature radius of the image side surface of the third lens is R6, -848.77 (R5+ R6)/(R5-R6) is less than or equal to-4.07, the shape of the third lens L3 can be effectively controlled, the third lens L3 can be favorably molded, the deflection degree of light rays passing through the lens can be alleviated within the range specified by the conditional expression, and the aberration can be effectively reduced. Preferably, it satisfies-530.48 ≦ (R5+ R6)/(R5-R6) ≦ -5.09.
The on-axis thickness of the third lens is d5, d5/TTL is more than or equal to 0.03 and less than or equal to 0.11, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 5/TTL. ltoreq.0.09 is satisfied.
The focal length of the fourth lens is f4, f4/f is more than or equal to 0.56 and less than or equal to 2.97, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 0.90. ltoreq. f 4/f. ltoreq.2.38 is satisfied.
The curvature radius of the object side surface of the fourth lens is R7, the curvature radius of the image side surface of the fourth lens is R8, and the curvature radius of (R7+ R8)/(R7-R8) is not more than 0.01, the shape of the fourth lens L4 is defined, and when the condition is within the range, the problem of aberration of off-axis drawing angles and the like can be favorably corrected along with the development of ultra-thin wide angles. Preferably, 0.02 ≦ (R7+ R8)/(R7-R8) ≦ 0.59.
The on-axis thickness of the fourth lens is d7, d7/TTL is more than or equal to 0.06 and less than or equal to 0.25, and ultra-thinning is facilitated. Preferably, 0.10. ltoreq. d 7/TTL. ltoreq.0.20 is satisfied.
The focal length of the fifth lens is f5, -9.02 and f5/f and-1.27, the definition of the fifth lens L5 can effectively make the light angle of the camera lens gentle and reduce the tolerance sensitivity. Preferably, it satisfies-5.64. ltoreq. f 5/f. ltoreq-1.59.
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, -3.01 ≤ (R9+ R10)/(R9-R10) ≤ 0.04, and the shape of the fifth lens L5 is determined, so that the problem of off-axis aberration can be corrected with the development of ultra-thin wide angle in a condition range. Preferably, it satisfies-1.88 ≦ (R9+ R10)/(R9-R10) ≦ -0.06.
The on-axis thickness of the fifth lens is d9, d9/TTL is more than or equal to 0.02 and less than or equal to 0.07, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 9/TTL. ltoreq.0.06 is satisfied.
The curvature radius of the object side surface of the sixth lens is R11, the curvature radius of the image side surface of the sixth lens is R12, -0.49 ≤ (R11+ R12)/(R11-R12) ≤ 0.93, and the shape of the sixth lens L6 is determined, so that the problem of off-axis aberration can be corrected with the development of ultra-thin wide angle within the condition range. Preferably, it satisfies-0.30 ≦ (R11+ R12)/(R11-R12). ltoreq.0.74.
The on-axis thickness of the sixth lens is d11, d11/TTL is more than or equal to 0.04 and less than or equal to 0.22, and ultra-thinning is facilitated. Preferably, 0.07. ltoreq. d 11/TTL. ltoreq.0.17 is satisfied.
The focal length of the seventh lens is f7, -47.51 and f7/f and-1.59, and the system has better imaging quality and lower sensitivity through reasonable distribution of optical power. Preferably, it satisfies-29.70. ltoreq. f 7/f. ltoreq-1.98.
The curvature radius of the object side surface of the seventh lens is R13, the curvature radius of the image side surface of the seventh lens is R14, and the curvature radius of (R13+ R14)/(R13-R14) is not more than 1.50, and the shape of the seventh lens L7 is defined, so that the problem of off-axis aberration and the like can be corrected as the ultra-thin wide angle is increased within the condition range. Preferably, 2.39 ≦ (R13+ R14)/(R13-R14) ≦ 13.10.
The on-axis thickness of the seventh lens is d13, d13/TTL is more than or equal to 0.03 and less than or equal to 0.13, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 13/TTL. ltoreq.0.11 is satisfied.
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 8.73 and less than or equal to-2.96, and in the condition range, 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 that the miniaturization of the image lens system group is maintained. Preferably, -5.46. ltoreq. f 12/f. ltoreq. -1.64.
In the present embodiment, the ratio of the total optical length TTL of the imaging optical lens 10 to the image height IH of the imaging optical lens 10 is: TTL/IH is less than or equal to 2.05, which is beneficial to realizing ultra-thinning.
In the present embodiment, the field angle FOV in the diagonal direction of the imaging optical lens 10 is equal to or larger than 136 °, which is advantageous for achieving a wide angle.
In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.41 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: optical length (on-axis distance from the object side surface of the 1 st lens L1 to the image forming surface) in 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: a radius of curvature of the object side surface of the sixth lens L6;
r12: a radius of curvature of the image-side surface of the sixth lens L6;
r13: a radius of curvature of the object side surface of the seventh lens L7;
r14: a radius of curvature of the image-side surface of the seventh lens L7;
r15: radius of curvature of the object side of the optical filter GF;
r16: 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: the on-axis thickness of the sixth lens L6;
d 12: an on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;
d 13: the on-axis thickness of the seventh lens L7;
d 14: the on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the optical filter GF;
d 15: on-axis thickness of the optical filter GF;
d 16: 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;
nd 6: the refractive index of the d-line of the sixth lens L6;
nd 7: the refractive index of the d-line of the seventh lens L7;
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;
v 6: abbe number of the sixth lens L6;
v 7: abbe number of the seventh lens L7;
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, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, and P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, 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 | Point of inflection pointDevice 2 | Position of reverse curvature 3 | Position of |
|
| P1R1 | |||||
| P1R2 | 1 | 1.125 | |||
| P2R1 | 2 | 0.555 | 1.005 | ||
| |
4 | 0.605 | 0.635 | 0.805 | 0.895 |
| P3R1 | |||||
| P3R2 | |||||
| P4R1 | |||||
| P4R2 | |||||
| P5R1 | |||||
| P5R2 | 2 | 0.095 | 0.855 | ||
| P6R1 | 2 | 0.775 | 1.915 | ||
| |
4 | 0.465 | 0.635 | 0.945 | 1.695 |
| |
4 | 0.635 | 1.255 | 2.105 | 2.565 |
| |
4 | 0.615 | 1.415 | 1.835 | 2.795 |
[ TABLE 4 ]
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 17 shown later shows values corresponding to the parameters specified in the conditional expressions for the respective numerical values in examples 1, 2, 3, and 4.
As shown in table 17, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.708mm, a full field image height of 3.28mm, a diagonal field angle of 136.00 °, 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 reverse curvature 2 | Position of reverse curvature 3 | |
| P1R1 | 1 | 3.015 | ||
| P1R2 | 1 | 1.505 | ||
| P2R1 | 1 | 0.845 | ||
| P2R2 | 1 | 0.645 | ||
| P3R1 | 2 | 0.585 | 0.745 | |
| P3R2 | ||||
| P4R1 | ||||
| P4R2 | ||||
| P5R1 | ||||
| P5R2 | 1 | 0.885 | ||
| P6R1 | 2 | 1.035 | 1.905 | |
| P6R2 | 2 | 0.305 | 1.235 | |
| P7R1 | 3 | 0.695 | 1.875 | 2.525 |
| P7R2 | 3 | 0.695 | 2.065 | 2.625 |
[ TABLE 8 ]
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.
As shown in table 17, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.7mm, a full field image height of 3.28mm, a diagonal field angle of 136.00 °, 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 ]
[ TABLE 12 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | Location of stagnation 3 | |
| P1R1 | ||||
| P1R2 | ||||
| P2R1 | ||||
| P2R2 | 3 | 0.335 | 0.605 | 1.445 |
| P3R1 | ||||
| P3R2 | ||||
| P4R1 | ||||
| P4R2 | ||||
| P5R1 | ||||
| P5R2 | 1 | 0.215 | ||
| P6R1 | 1 | 1.295 | ||
| P6R2 | 2 | 0.965 | 1.715 | |
| P7R1 | 1 | 0.875 | ||
| P7R2 | 1 | 1.305 |
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.
As shown in table 17, the third embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.667mm, a full field image height of 3.28mm, a diagonal field angle of 136.00 °, a wide angle, and a high profile, 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.
Tables 13 and 14 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 13 ]
Table 14 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 14 ]
Tables 15 and 16 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 15 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Position of reverse curvature 3 | |
| P1R1 | 1 | 0.495 | ||
| P1R2 | 1 | 1.645 | ||
| P2R1 | 1 | 1.165 | ||
| P2R2 | ||||
| P3R1 | ||||
| P3R2 | ||||
| P4R1 | ||||
| P4R2 | ||||
| P5R1 | ||||
| P5R2 | 1 | 0.865 | ||
| P6R1 | 2 | 0.545 | 1.345 | |
| P6R2 | 2 | 0.375 | 1.035 | |
| P7R1 | 3 | 0.625 | 1.645 | 2.275 |
| P7R2 | 1 | 0.655 |
[ TABLE 16 ]
Fig. 14 and 15 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 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.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.72mm, a full field image height of 3.28mm, a diagonal field angle of 136.00 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 17 ]
Where Fno is the F-number of the diaphragm of the imaging optical lens.
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 (10)
1. An imaging optical lens comprising seven lenses, in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens;
the first lens element with negative refractive power, the second lens element with positive refractive power, the third lens element with positive refractive power, the fourth lens element with positive refractive power, the fifth lens element with negative refractive power, the sixth lens element with positive refractive power, and the seventh lens element with negative refractive power;
the optical imaging lens system comprises an imaging optical lens, a first lens, a second lens, a third lens and a fourth lens, wherein the focal length of the imaging optical lens system is f, the focal length of the first lens is f1, the object-side radius of curvature of the second lens is R3, the image-side radius of curvature of the second lens is R4, the object-side radius of curvature of the third lens is R5, the image-side radius of curvature of the third lens is R6, the object-side radius of curvature of the fourth lens is R7, the image-side radius of curvature of the fourth lens is R8, 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 thickness of the second lens is d3, and the following relations are satisfied:
-3.00≤f1/f≤-1.00；
-15.00≤(R3+R4)/(R3-R4)≤-1.50；
-3.00≤R7/R8≤-1.00；
1.50≤d2/d3≤5.00；
-530.48≤(R5+R6)/(R5-R6)≤-4.07。
2. the imaging optical lens according to claim 1, wherein the sixth lens has a focal length f6 and satisfies the following relationship:
1.20≤f6/f≤3.00。
3. the image-capturing optical lens unit according to claim 1, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, the on-axis thickness of the first lens element is d1, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:
0.47≤(R1+R2)/(R1-R2)≤2.03；
0.03≤d1/TTL≤0.14。
4. a camera optical lens according to claim 1, wherein the focal length of the second lens element is f2, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:
1.16≤f2/f≤27.30；
0.02≤d3/TTL≤0.14。
5. the image-capturing optical lens of claim 1, wherein the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:
2.20≤f3/f≤56.95；
0.03≤d5/TTL≤0.11。
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:
0.56≤f4/f≤2.97；
0.01≤(R7+R8)/(R7-R8)≤0.74；
0.06≤d7/TTL≤0.25。
7. the image-capturing optical lens unit according to claim 1, wherein the fifth lens element has a focal length f5, a radius of curvature of an object-side surface of the fifth lens element is R9, a radius of curvature of an image-side surface of the fifth lens element is R10, an on-axis thickness of the fifth lens element is d9, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-9.02≤f5/f≤-1.27；
-3.01≤(R9+R10)/(R9-R10)≤-0.04；
0.02≤d9/TTL≤0.07。
8. the image-capturing optical lens unit according to claim 1, wherein the curvature radius of the object-side surface of the sixth lens element is R11, the curvature radius of the image-side surface of the sixth lens element is R12, the on-axis thickness of the sixth lens element is d11, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:
-0.49≤(R11+R12)/(R11-R12)≤0.93；
0.04≤d11/TTL≤0.22。
9. the image-taking optical lens according to claim 1, wherein the seventh lens element has a focal length f7, a radius of curvature of an object-side surface of the seventh lens element is R13, a radius of curvature of an image-side surface of the seventh lens element is R14, an on-axis thickness of the seventh lens element is d13, an optical total length of the image-taking optical lens is TTL, and the following relationship is satisfied:
-47.51≤f7/f≤-1.59；
1.50≤(R13+R14)/(R13-R14)≤16.38；
0.03≤d13/TTL≤0.13。
10. 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:
-8.73≤f12/f≤-1.31。
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