CN113960771B - Optical lens - Google Patents
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- CN113960771B CN113960771B CN202111230877.6A CN202111230877A CN113960771B CN 113960771 B CN113960771 B CN 113960771B CN 202111230877 A CN202111230877 A CN 202111230877A CN 113960771 B CN113960771 B CN 113960771B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 132
- 238000010586 diagram Methods 0.000 description 19
- 230000004075 alteration Effects 0.000 description 17
- 238000003384 imaging method Methods 0.000 description 9
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- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
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- 210000001747 pupil Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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Abstract
The present disclosure relates to optical lenses, and particularly to an optical lens. The optical lens 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, a seventh lens and an eighth lens; the first lens and the second lens have positive refractive power; the focal length of the optical lens is f, and the total optical length is TTL; the focal length of the second lens is f2; the center curvature radius of the object side surface of the third lens is R5, and the center curvature radius of the image side surface is R6; the distance d11 from the object side surface of the sixth lens element to the image side surface, and the distance d12 from the image side surface to the object side surface of the seventh lens element; and satisfies the following relation that f/TTL is not less than 0.75; f2/f is more than or equal to 0.8 and less than or equal to 8.2; -3.2 < R5+ R6)/(R5R 6) < 0.3; d11/d12 is more than or equal to 0.8 and less than or equal to 8.2. The optical lens has good optical performance and meets the design requirements of large aperture and ultra-thin.
Description
Technical Field
The present invention relates to the field of optical lenses, and more particularly, to an optical lens suitable for use in portable terminal devices such as smart phones and digital cameras, and imaging devices such as monitors and PC lenses.
Background
In recent years, with the rising of electronic devices such as PC computers, unmanned aerial vehicles, smart phones, etc., the demands for miniaturized high-image-quality photographic lenses are increasing, but the photosensitive devices of general photographic lenses are not limited to photosensitive coupling devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductor devices (Complementary Metal-OxideSemiconductor Sensor, CMOS Sensor), and due to the refinement of semiconductor manufacturing technology, the pixel size of the photosensitive devices is reduced, and the development trend of the present electronic products is increasing with excellent functions, light weight, short weight, and small size. Therefore, miniaturized imaging lenses with good imaging quality are regarded as the mainstream in the market at present.
In order to obtain better imaging quality, the traditional lens carried on the mobile phone camera adopts three-piece, four-piece or even five-piece or six-piece lens structures. However, with the development of technology and the increasing demands of users for diversification, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirements of the system on the imaging quality are continuously improved, an eight-lens structure gradually appears in the lens design, and although the common eight-lens structure has better optical performance, the focal power, the lens spacing and the lens shape arrangement still have certain irrational properties, so that the lens structure can not meet the design requirements of large aperture and ultra-thin while having good optical performance.
Disclosure of Invention
In view of the above, the present invention provides an optical lens that has good optical performance and meets the design requirements of large aperture and ultra-thin.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
an optical lens, comprising, 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, a seventh lens and an eighth lens;
the first lens and the second lens each have positive refractive power;
the focal length of the optical lens is f, and the total optical length is TTL; the focal length of the second lens is f2; the center curvature radius of the object side surface of the third lens is R5, and the center curvature radius of the image side surface is R6; an on-axis distance from an object side surface of the sixth lens element to an image side surface is d11, and an on-axis distance from the image side surface to the object side surface of the seventh lens element is d12; and satisfies the following relationship:
0.75≤f/TTL；
0.8≤f2/f≤8.2；
-3.2≤(R5+R6)/(R5-R6)≤-0.3；
0.8≤d11/d12≤8.2。
further, the optical lens satisfies the following relation:
0.8≤f/TTL；
1≤f2/f≤8；
-3≤(R5+R6)/(R5-R6)≤-0.5；
1≤d11/d12≤8。
further, the focal length of the first lens element is f1, the central radius of curvature of the object-side surface is R1, the central radius of curvature of the image-side surface is R2, and the on-axis distance from the object-side surface to the image-side surface is d1; and satisfies the following relationship:
1≤f1/f≤1.8；
-3.2≤(R1+R2)/(R1-R2)≤-1.7；
0.02≤d1/TTL≤0.13。
further, the optical lens satisfies the following relation:
1.2≤f1/f≤1.6；
-3≤(R1+R2)/(R1-R2)≤-1.9；
0.04≤d1/TTL≤0.11。
further, the second lens element has a central curvature radius R3 of the object-side surface, a central curvature radius R4 of the image-side surface and an axial distance d3 from the object-side surface to the image-side surface; and satisfies the following relationship:
-7.11≤(R3+R4)/(R3-R4)≤-0.19；
0.01≤d3/TTL≤0.12。
further, the optical lens satisfies the following relation:
-6.91≤(R3+R4)/(R3-R4)≤-0.39；
0.03≤d3/TTL≤0.1。
further, the on-axis distance from the object side surface to the image side surface of the third lens is d5; and satisfies the following relationship:
0.02≤d5/TTL≤0.065。
further, the optical lens satisfies the following relation:
0.025≤d5/TTL≤0.06。
further, the focal length of the fourth lens element is f4, and the axial distance from the object side surface to the image side surface is d7; and satisfies the following relationship:
-0.9≤f4/f≤-0.4；
0.019≤d7/TTL≤0.062。
further, the optical lens satisfies the following relation:
-0.7≤f4/f≤-0.6；
0.024≤d7/TTL≤0.057。
further, the focal length of the fifth lens element is f5, the center radius of curvature of the object-side surface is R9, the center radius of curvature of the image-side surface is R10, and the on-axis distance from the object-side surface to the image-side surface is d9; and satisfies the following relationship:
0.72≤f5/f≤0.95；
-0.91≤(R9+R10)/(R9-R10)≤-0.37；
0.074≤d9/TTL≤0.099。
further, the optical lens satisfies the following relation:
0.77≤f5/f≤0.9；
-0.86≤(R9+R10)/(R9-R10)≤-0.42；
0.079≤d9/TTL≤0.094。
further, an on-axis distance from an object side surface to an image side surface of the sixth lens is d11; and satisfies the following relationship:
0.053≤d11/TTL≤0.22。
further, the optical lens satisfies the following relation:
0.058≤d11/TTL≤0.17。
further, the focal length of the seventh lens element is f7, the center radius of curvature of the object-side surface is R13, the center radius of curvature of the image-side surface is R14, and the on-axis distance from the object-side surface to the image-side surface is d13; and satisfies the following relationship:
2.8≤f7/f≤8.41；
-12.71≤(R13+R14)/(R13-R14)≤-1.155；
0.074≤d13/TTL≤0.101。
further, the optical lens satisfies the following relation:
3≤f7/f≤8.21；
-12.21≤(R13+R14)/(R13-R14)≤-1.655；
0.079≤d13/TTL≤0.096。
further, the focal length of the eighth lens element is f8, the center radius of curvature of the object-side surface is R15, and the center radius of curvature of the image-side surface is R16; and satisfies the following relationship:
-0.96≤f 8/f≤-0.73；
0.072≤(R17+R18)/(R17-R18)≤0.39。
further, the optical lens satisfies the following relation:
-0.91≤f 8/f≤-0.78；
0.12≤(R17+R18)/(R17-R18)≤0.34。
by adopting the technical scheme, the invention has the following beneficial effects:
the optical lens has good optical performance, and meets the design requirements of large aperture and ultra-thin; the imaging lens is particularly suitable for a mobile phone imaging lens assembly and a WEB imaging lens which are composed of imaging elements such as CCD (charge coupled device) and CMOS (complementary metal oxide semiconductor) for high pixels.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an optical lens according to a first embodiment of the present invention;
fig. 2 is an axial aberration diagram of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of chromatic aberration on the vertical axis of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of curvature of field and distortion of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram showing the performance of an optical lens according to a first embodiment of the present invention;
fig. 6 is a schematic structural view of an optical lens according to a second embodiment of the present invention;
FIG. 7 is an axial aberration diagram of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a schematic diagram of chromatic aberration of a vertical axis of an optical lens according to a second embodiment of the present invention;
FIG. 9 is a schematic diagram of curvature of field and distortion of an optical lens according to a second embodiment of the present invention;
FIG. 10 is a schematic diagram showing the performance of an optical lens according to a second embodiment of the present invention;
fig. 11 is a schematic structural view of an optical lens according to a third embodiment of the present invention;
fig. 12 is an axial aberration diagram of an optical lens according to a third embodiment of the present invention;
FIG. 13 is a schematic diagram showing a vertical chromatic aberration of an optical lens according to a third embodiment of the present invention;
fig. 14 is a schematic diagram of curvature of field and distortion of an optical lens according to a third embodiment of the present invention;
FIG. 15 is a schematic diagram showing the performance of an optical lens according to a third embodiment of the present invention;
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
(first embodiment)
Referring to the drawings, the present invention provides an optical lens 10. Fig. 1 is a schematic structural diagram of an optical lens 10 according to a first embodiment of the present invention, where the optical lens 10 includes eight lenses. Specifically, the optical lens 10 sequentially includes, from an object side to an image side: the aperture stop S1, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8. An optical element such as an optical filter GF may be provided between the eighth lens L8 and the image plane Si.
In the present embodiment, the first lens element L1 has positive refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has negative refractive power, the fifth lens element L5 has positive refractive power, the sixth lens element L6 has positive refractive power, the seventh lens element L7 has positive refractive power, and the eighth lens element L8 has negative refractive power. It is understood that in other embodiments, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 may have other refractive powers. In the present embodiment, the first lens element L1 has positive refractive power, and the first lens element L1 has positive refractive power, which contributes to improving the performance of the optical system.
In the present embodiment, the first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, the sixth lens L6 is made of plastic, the seventh lens L7 is made of plastic, and the eighth lens L8 is made of plastic. In other embodiments, the lenses may be made of other materials.
The focal length of the optical lens 10 of the present embodiment is f, and the total optical length is TTL; the focal length of the second lens L2 is f2; the center curvature radius of the object side surface of the third lens element L3 is R5, and the center curvature radius of the image side surface is R6; an on-axis distance from the object side surface of the sixth lens element L6 to the image side surface is d11, and an on-axis distance from the image side surface to the object side surface of the seventh lens element L7 is d12; and satisfies the following relationship:
0.75≤f/TTL；0.8≤f2/f≤8.2；-3.2≤(R5+R6)/(R5-R6)≤-0.3；0.8≤d11/d12≤8.2。
preferably, 0.8.ltoreq.f/TTL; (1)
1≤f2/f≤8；(2)
-3≤(R5+R6)/(R5-R6)≤-0.5；(3)
1≤d11/d12≤8。(4)
The relation (1) specifies the ratio of the focal length f of the optical lens 10 to the total optical length TTL of the optical lens 10, and when the relation (1) satisfies the condition, the optical lens 10 has a longer focal length in the same length.
The relation (2) specifies the ratio of the focal length f2 of the second lens L2 to the focal length f of the optical lens 10, and can effectively balance the spherical aberration and the curvature of field of the system.
The relation (3) defines the shape of the third lens L3, and the degree of deflection of the light beam through the lens can be relaxed within the range of the relation (3), thereby effectively reducing aberration.
The relation (4) defines the ratio of the on-axis thickness d11 of the sixth lens element L6 to the on-axis distance d12 from the image side surface of the sixth lens element L6 to the object side surface of the seventh lens element L7, and the relation (4) contributes to the total length of the compression optical system within the relation range, thereby realizing the effect of ultra-thinning.
When the above relation is satisfied, the optical lens 10 has good optical performance and can satisfy the design requirements of large aperture and ultra-thin; the optical lens 10 is particularly suitable for a mobile phone image pickup lens unit and a WEB image pickup lens, which are composed of an image pickup device such as a CCD or CMOS for high pixels, according to the characteristics of the optical lens 10.
In this embodiment, the focal length of the first lens element L1 is f1, the central radius of curvature of the object-side surface is R1, the central radius of curvature of the image-side surface is R2, and the on-axis distance from the object-side surface to the image-side surface is d1; and satisfies the following relationship:
1≤f1/f≤1.8；-3.2≤(R1+R2)/(R1-R2)≤-1.7；0.02≤d1/TTL≤0.13。
preferably, f1/f is more than or equal to 1.2 and less than or equal to 1.6; -3 < 1+R2)/(R1-R2) < 1.9; d1/TTL is more than or equal to 0.04 and less than or equal to 0.11.
In this embodiment, the second lens element L2 has a central curvature radius R3 of the object-side surface, a central curvature radius R4 of the image-side surface, and an on-axis distance d3 from the object-side surface to the image-side surface; and satisfies the following relationship:
-7.11≤(R3+R4)/(R3-R4)≤-0.19；0.01≤d3/TTL≤0.12。
preferably, -6.91 is less than or equal to (R3+R4)/(R3-R4) is less than or equal to-0.39; d3/TTL is more than or equal to 0.03 and less than or equal to 0.1.
In this embodiment, the on-axis distance from the object side surface to the image side surface of the third lens element L3 is d5; and satisfies the following relationship:
0.02≤d5/TTL≤0.065。
preferably, d5/TTL is less than or equal to 0.025 and less than or equal to 0.06.
In this embodiment, the focal length of the fourth lens element L4 is f4, and the on-axis distance from the object side surface to the image side surface is d7; and satisfies the following relationship:
-0.9≤f4/f≤-0.4；0.019≤d7/TTL≤0.062。
preferably, -0.7.ltoreq.f4/f.ltoreq.0.6; d7/TTL is more than or equal to 0.024 and less than or equal to 0.057.
In this embodiment, the focal length of the fifth lens element L5 is f5, the central radius of curvature of the object-side surface is R9, the central radius of curvature of the image-side surface is R10, and the on-axis distance from the object-side surface to the image-side surface is d9; and satisfies the following relationship:
0.72≤f5/f≤0.95；-0.91≤(R9+R10)/(R9-R10)≤-0.37；0.074≤d9/TTL≤0.099。
preferably, f5/f is more than or equal to 0.77 and less than or equal to 0.9; -0.86 < CHEM > R9+ R10)/(R9-R10) < CHEM > 0.42; d9/TTL is more than or equal to 0.079 and less than or equal to 0.094.
In this embodiment, the on-axis distance from the object side surface to the image side surface of the sixth lens element L6 is d11; and satisfies the following relationship:
0.053≤d11/TTL≤0.22。
preferably, d11/TTL is 0.058-0.17.
In this embodiment, the focal length of the seventh lens element L7 is f7, the central radius of curvature of the object-side surface is R13, the central radius of curvature of the image-side surface is R14, and the on-axis distance from the object-side surface to the image-side surface is d13; and satisfies the following relationship:
2.8≤f7/f≤8.41；-12.71≤(R13+R14)/(R13-R14)≤-1.155；0.074≤d13/TTL≤0.101。
preferably, f7/f is more than or equal to 3 and less than or equal to 8.21; -12.21 < CHEM > R13+ R14)/(R13-R14) < CHEM > 1.655; d13/TTL is more than or equal to 0.079 and less than or equal to 0.096.
In this embodiment, the focal length of the eighth lens element L8 is f8, the central radius of curvature of the object-side surface is R15, and the central radius of curvature of the image-side surface is R16; and satisfies the following relationship:
-0.96≤f 8/f≤-0.73；0.072≤(R17+R18)/(R17-R18)≤0.39。
preferably, -0.91 is less than or equal to f 8/f is less than or equal to-0.78; (R17+R18)/(R17-R18) is less than or equal to 0.12 and less than or equal to 0.34.
The relation (1) specifies the ratio of the focal length f of the optical lens 10 to the total optical length TTL of the optical lens 10, and when the relation (1) satisfies the condition, the optical lens 10 has a longer focal length in the same length.
The relation (2) specifies the ratio of the focal length f2 of the second lens L2 to the focal length f of the optical lens 1010, which can effectively balance the spherical aberration and the curvature of field of the system.
The relation (3) defines the shape of the third lens L3, and the degree of deflection of the light beam through the lens can be relaxed within the range of the relation (3), thereby effectively reducing aberration.
The relation (4) defines the ratio of the on-axis thickness d11 of the sixth lens element L6 to the on-axis distance d12 from the image side surface of the sixth lens element L6 to the object side surface of the seventh lens element L7, and the relation (4) contributes to the total length of the compression optical system within the relation range, thereby realizing the effect of ultra-thinning.
When the above relation is satisfied, the optical lens 10 has good optical performance and can satisfy the design requirements of large aperture and ultra-thin; the optical lens 10 is particularly suitable for a mobile phone image pickup lens unit and a WEB image pickup lens, which are composed of an image pickup device such as a CCD or CMOS for high pixels, according to the characteristics of the optical lens 10.
The optical lens 10 of the present invention will be described below by way of example. Symbols described in the examples are as follows. The units of focal length, on-axis distance, center radius of curvature, on-axis thickness, inflection point position, stagnation point position are mm.
TTL: the optical total length (on-axis distance from the object side surface of the first lens L1 to the image plane Si) is in mm;
aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of the optical lens 10.
The specific lens design data, aspherical surface data, inflection point design data and standing point design data are shown in tables 1, 2, 3 and 4 respectively. Wherein k is a conic coefficient, A4, A6, A8, a10, a12, a14, a16, a18, a20 are aspheric coefficients;
fig. 2 and 3 show axial aberration and vertical chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively, after passing through the optical lens 10 of the first embodiment. Fig. 4 is a schematic diagram showing the curvature of field and distortion of 555nm light passing through the optical lens 10 of the first embodiment, where S in fig. 4 is the curvature of field in the sagittal direction and T is the curvature of field in the meridional direction; fig. 5 is a schematic diagram showing the relationship between MTF and spatial frequency after the optical lens 10 according to the first embodiment.
[ Table 1 ]
[ Table 2 ]
[ Table 3 ]
[ Table 4 ]
In each table, the meanings of each symbol are as follows.
S1: an aperture; r: radius of curvature at the center of the optical surface; r1: a center radius of curvature of the object side surface of the first lens L1; r2: a center radius of curvature of the image side surface of the first lens L1; r3: a center radius of curvature of the object side surface of the second lens L2; r4: a center radius of curvature of the image side surface of the second lens L2; r5: a center radius of curvature of the object side surface of the third lens L3; r6: a center radius of curvature of the image side surface of the third lens L3; r7: a center radius of curvature of the object side surface of the fourth lens L4; r8: a center radius of curvature of the image side surface of the fourth lens L4; r9: a center radius of curvature of the object side surface of the fifth lens L5; r10: a center radius of curvature of the image side surface of the fifth lens L5; r11: a center radius of curvature of the object side surface of the sixth lens L6; r12: a center radius of curvature of the image side surface of the sixth lens L6; r13: a center radius of curvature of the object side surface of the seventh lens L7; r14: a center radius of curvature of the image side surface of the seventh lens L7; r15: a center radius of curvature of the object side surface of the eighth lens L8; r16: a center radius of curvature of the image side surface of the eighth lens L8; r17: the center radius of curvature of the object side surface of the optical filter GF; r18: the center radius of curvature of the image side of the optical filter GF; d: on-axis thickness of the lenses, on-axis distance between the lenses; d0: an on-axis distance from the aperture S1 to the object side of the first lens L1; d1: the on-axis thickness of the first lens L1; d2: an on-axis distance from an image side surface of the first lens element L1 to an object side surface of the second lens element L2; d3: the on-axis thickness of the second lens L2; d4: an on-axis distance from the image side surface of the second lens element L2 to the object side surface of the third lens element L3; d5: the on-axis thickness of the third lens L3; d6: an on-axis distance from an image side surface of the third lens element L3 to an object side surface of the fourth lens element L4; d7: the on-axis thickness of the fourth lens L4; d8: an on-axis distance from the image side surface of the fourth lens element L4 to the object side surface of the fifth lens element L5; d9: an on-axis thickness of the fifth lens L5; d10: an on-axis distance from the image side surface of the fifth lens element L5 to the object side surface of the sixth lens element L6; d11: the on-axis thickness of the sixth lens L6; d12: an on-axis distance from an image side surface of the sixth lens element L6 to an object side surface of the seventh lens element L7; d13: the on-axis thickness of the seventh lens L7; d14: an on-axis distance from an image side surface of the seventh lens element L7 to an object side surface of the eighth lens element L8; d15: an on-axis thickness of the eighth lens L8; d16: an on-axis distance from the image side surface of the eighth lens L8 to the object side surface of the optical filter GF;
d17: the on-axis thickness of the optical filter GF; d18: an on-axis distance from an image side surface to an image plane Si of the optical filter GF; nd: refractive index of d-line; nd1: refractive index of d-line of the first lens L1; nd2: refractive index of d-line of the second lens L2; nd3: refractive index of d-line of the third lens L3; nd4: refractive index of d-line of the fourth lens L4; nd5: refractive index of d-line of the fifth lens L5; nd6: refractive index of d-line of the sixth lens L6; nd7: refractive index of d-line of the seventh lens L7; nd8: refractive index of d-line of the eighth lens L8; ndg: refractive index of d-line of optical filter GF; vd: abbe number; vd1: abbe number of the first lens L1; vd2: abbe number of the second lens L2; vd3: abbe number of the third lens L3; vd4: abbe number of the fourth lens L4; vd5: abbe number of the fifth lens L5; vd6: abbe number of the sixth lens L6; vd7: abbe number of the seventh lens L7; vd8: abbe number of the eighth lens L8; vdg: abbe number of the optical filter GF. P1R1 and P1R2 respectively represent the object-side surface and the image-side surface of the first lens element L1, P2R1 and P2R2 respectively represent the object-side surface and the image-side surface of the second lens element L2, P3R1 and P3R2 respectively represent the object-side surface and the image-side surface of the third lens element L3, P4R1 and P4R2 respectively represent the object-side surface and the image-side surface of the fourth lens element L4, P5R1 and P5R2 respectively represent the object-side surface and the image-side surface of the fifth lens element L5, P6R1 and P6R2 respectively represent the object-side surface and the image-side surface of the sixth lens element L6, P7R1 and P7R2 respectively represent the object-side surface and the image-side surface of the seventh lens element L7, and P8R1 and P8R2 respectively represent the object-side surface and the image-side surface of the eighth lens element L8. The corresponding data of the 'inflection point position' is the vertical distance from the inflection point arranged on each lens surface to the optical axis of the optical lens. The data corresponding to the standing point position is the vertical distance from the standing point set on each lens surface to the optical axis of the optical lens.
The ENPD of the optical lens represents the diameter of an entrance pupil, the full-field image height IH is 6.000mm, the FOV is a field angle in the diagonal direction, the embodiments of the optical lens meet the design requirements of large aperture and ultra-thin, and the on-axis and off-axis chromatic aberration of the optical lens are fully corrected and have excellent optical characteristics.
(second embodiment)
As shown in fig. 6, the configuration of the image pickup optical mirror 20 according to the present embodiment is the same as that of the first embodiment except for the parameters related to tables 5 to 8, and therefore overlapping portions are not described again.
The specific lens design data, aspherical surface data, inflection point design data and standing point design data are shown in tables 5, 6, 7 and 8 respectively. Fig. 7 and 8 show axial aberration and vertical chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively, after passing through the optical lens 20. Fig. 9 is a schematic diagram showing the curvature of field and distortion of 555nm light passing through the optical lens 20 of the second embodiment, wherein the curvature of field S in fig. 9 is the curvature of field in the sagittal direction, and T is the curvature of field in the meridional direction; fig. 10 is a schematic diagram showing the relationship between MTF and spatial frequency after the optical lens 20 according to the second embodiment.
[ Table 5 ]
[ Table 6 ]
[ Table 7 ]
| Number of inflection points | Inflection point position 1 | Inflection point location 2 | Inflection point location 3 | |
| P1R1 | 0 | 0 | 0 | 0 |
| P1R2 | 0 | 0 | 0 | 0 |
| P2R1 | 0 | 0 | 0 | 0 |
| P2R2 | 2 | 1.205 | 1.405 | 0 |
| P3R1 | 0 | 0 | 0 | 0 |
| P3R2 | 2 | 1.135 | 1.345 | 0 |
| P4R1 | 0 | 0 | 0 | 0 |
| P4R2 | 0 | 0 | 0 | 0 |
| P5R1 | 1 | 1.305 | 0 | 0 |
| P5R2 | 0 | 0 | 0 | 0 |
| P6R1 | 1 | 1.655 | 0 | 0 |
| P2R2 | 1 | 1.685 | 0 | 0 |
| P7R1 | 1 | 0.685 | 0 | 0 |
| P7R2 | 1 | 0.565 | 0 | 0 |
| P8R1 | 1 | 1.785 | 0 | 0 |
| P8R2 | 3 | 0.635 | 1.685 | 2.245 |
[ Table 8 ]
(third embodiment)
As shown in fig. 11, the configuration of the image pickup optical mirror 30 according to the present embodiment is the same as that of the first embodiment except for the parameters related to tables 9 to 12, and therefore overlapping portions are not described again.
The specific lens design data, aspherical surface data, inflection point design data and standing point design data are shown in tables 9, 10, 11 and 12 respectively. Fig. 12 and 13 show axial aberration and vertical chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively, after passing through the optical lens 20. Fig. 14 is a schematic diagram showing the curvature of field and distortion of 555nm light passing through the optical lens of the third embodiment, wherein the curvature of field S in fig. 14 is the curvature of field in the sagittal direction, and T is the curvature of field in the meridional direction; fig. 15 is a schematic diagram showing the relationship between MTF and spatial frequency after the optical lens 30 according to the third embodiment.
[ Table 9 ]
[ Table 10 ]
[ Table 11 ]
[ Table 12 ]
| Number of residence points | Standing spot position 1 | Standing spot position 2 | |
| P1R1 | 0 | 0 | 0 |
| P1R2 | 0 | 0 | 0 |
| P2R1 | 0 | 0 | 0 |
| P2R2 | 0 | 0 | 0 |
| P3R1 | 0 | 0 | 0 |
| P3R2 | 0 | 0 | 0 |
| P4R1 | 0 | 0 | 0 |
| P4R2 | 0 | 0 | 0 |
| P5R1 | 0 | 0 | 0 |
| P5R2 | 0 | 0 | 0 |
| P6R1 | 0 | 0 | 0 |
| P2R2 | 0 | 0 | 0 |
| P7R1 | 1 | 1.055 | 0 |
| P7R2 | 1 | 0.525 | 0 |
| P8R1 | 0 | 0 | 0 |
| P8R2 | 1 | 2.365 | 0 |
Table 13 shows that the above embodiments satisfy the respective conditional expressions.
[ Table 13 ]
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (16)
1. The utility model provides an optical lens, its characterized in that, optical lens is in proper order from object side to image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens;
the first lens and the second lens each have positive refractive power; the third lens element with positive refractive power, the fourth lens element with negative refractive power, the fifth lens element with positive refractive power, the sixth lens element with positive refractive power, the seventh lens element with positive refractive power, and the eighth lens element with negative refractive power; an optical element is arranged between the eighth lens and the image plane;
the focal length of the optical lens is f, and the total optical length is TTL; the focal length of the second lens is f2; the center curvature radius of the object side surface of the third lens is R5, and the center curvature radius of the image side surface is R6; an on-axis distance from an object side surface of the sixth lens element to an image side surface is d11, and an on-axis distance from the image side surface to the object side surface of the seventh lens element is d12; and satisfies the following relationship:
0.75≤f/TTL；
0.8≤f2/f≤8.2；
-3.2≤(R5+R6)/(R5-R6)≤-0.3；
0.8≤d11/d12≤8.2；
the focal length of the first lens is f1, the center curvature radius of the object side surface is R1, the center curvature radius of the image side surface is R2, and the on-axis distance from the object side surface to the image side surface is d1; and satisfies the following relationship:
1≤f1/f≤1.8；
-3.2≤(R1+R2)/(R1-R2)≤-1.7；
0.02≤d1/TTL≤0.13；
the focal length of the fourth lens is f4, and the on-axis distance from the object side surface to the image side surface is d7; and satisfies the following relationship:
-0.9≤f4/f≤-0.4；
0.019≤d7/TTL≤0.062。
2. the optical lens of claim 1, wherein the optical lens satisfies the following relationship:
0.8≤f/TTL；
1≤f2/f≤8；
-3≤(R5+R6)/(R5-R6)≤-0.5；
1≤d11/d12≤8。
3. the optical lens of claim 1, wherein the optical lens satisfies the following relationship:
1.2≤f1/f≤1.6；
-3≤(R1+R2)/(R1-R2)≤-1.9；
0.04≤d1/TTL≤0.11。
4. the optical lens of claim 1, wherein the second lens element has a center radius of curvature R3 for an object-side surface, a center radius of curvature R4 for an image-side surface, and an on-axis distance d3 from the object-side surface to the image-side surface; and satisfies the following relationship:
-7.11≤(R3+R4)/(R3-R4)≤-0.19；
0.01≤d3/TTL≤0.12。
5. the optical lens of claim 4, wherein the optical lens satisfies the following relationship:
-6.91≤(R3+R4)/(R3-R4)≤-0.39；
0.03≤d3/TTL≤0.1。
6. the optical lens of claim 1, wherein an on-axis distance from an object side surface to an image side surface of the third lens element is d5; and satisfies the following relationship:
0.02≤d5/TTL≤0.065。
7. the optical lens of claim 6, wherein the optical lens satisfies the following relationship:
0.025≤d5/TTL≤0.06。
8. the optical lens of claim 1, wherein the optical lens satisfies the following relationship:
-0.7≤f4/f≤-0.6；
0.024≤d7/TTL≤0.057。
9. the optical lens assembly of claim 1, wherein the fifth lens element has a focal length f5, a center radius of curvature of the object-side surface R9 and a center radius of curvature of the image-side surface R10, and an on-axis object-side-to-image-side distance d9; and satisfies the following relationship:
0.72≤f5/f≤0.95；
-0.91≤(R9+R10)/(R9-R10)≤-0.37；
0.074≤d9/TTL≤0.099。
10. the optical lens of claim 9, wherein the optical lens satisfies the following relationship:
0.77≤f5/f≤0.9；
-0.86≤(R9+R10)/(R9-R10)≤-0.42；
0.079≤d9/TTL≤0.094。
11. the optical lens of claim 1, wherein an on-axis distance from an object side surface to an image side surface of the sixth lens element is d11; and satisfies the following relationship:
0.053≤d11/TTL≤0.22。
12. the optical lens of claim 11, wherein the optical lens satisfies the following relationship:
0.058≤d11/TTL≤0.17。
13. the optical lens assembly of claim 1, wherein the seventh lens element has a focal length f7, a center radius of curvature of the object-side surface R13, a center radius of curvature of the image-side surface R14, and an on-axis object-side-to-image-side distance d13; and satisfies the following relationship:
2.8≤f7/f≤8.41；
-12.71≤(R13+R14)/(R13-R14)≤-1.155；
0.074≤d13/TTL≤0.101。
14. the optical lens of claim 13, wherein the optical lens satisfies the following relationship:
3≤f7/f≤8.21；
-12.21≤(R13+R14)/(R13-R14)≤-1.655；
0.079≤d13/TTL≤0.096。
15. the optical lens of claim 1, wherein the eighth lens element has a focal length f8, a center radius of curvature of the object-side surface R15, and a center radius of curvature of the image-side surface R16; and satisfies the following relationship:
-0.96≤f8/f≤-0.73；
0.072≤(R17+R18)/(R17-R18)≤0.39。
16. the optical lens of claim 15, wherein the optical lens satisfies the following relationship:
-0.91≤f8/f≤-0.78；
0.12≤(R17+R18)/(R17-R18)≤0.34。
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