CN113960771A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN113960771A CN113960771A CN202111230877.6A CN202111230877A CN113960771A CN 113960771 A CN113960771 A CN 113960771A CN 202111230877 A CN202111230877 A CN 202111230877A CN 113960771 A CN113960771 A CN 113960771A
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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 invention relates to the field of optical lenses, in particular to an optical lens. The optical lens sequentially comprises from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element; the first lens element and the second lens element both 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 f 2; the central curvature radius of the object side surface of the third lens is R5, and the central curvature radius of the image side surface of the third lens is R6; the on-axis distance from the object-side surface of the sixth lens to the image-side surface is d11, and the on-axis distance from the image-side surface to the object-side surface of the seventh lens is d 12; and satisfies the following relational expression f/TTL of 0.75-0; f2/f is more than or equal to 0.8 and less than or equal to 8.2; -3.2 ≤ (R5+ R6)/(R5R6) is ≤ 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-thinness.
Description
Technical Field
The present invention relates to the field of optical lenses, and in particular, to an optical lens suitable for 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 rise of electronic devices such as PC computers, unmanned aerial vehicles, smart phones, etc., the demand for miniaturized high image quality camera lenses is increasing, and the photosensitive devices of the common camera lenses are not limited to two types, namely, a Charge Coupled Device (CCD) or a Complementary Metal-oxide semiconductor (CMOS) Sensor, and due to the advancement of semiconductor manufacturing technology, the pixel size of the photosensitive devices is reduced, and the current electronic products are developed to have a good function, a light weight, a small size, and a small size. Therefore, a small-sized image pickup lens having good image quality is apparently the mainstream in the market.
In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts three-piece, four-piece, or even five-piece or six-piece lens structures. However, with the development of technology and the increasing demand of diversification of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system for the imaging quality is continuously improved, an eight-piece lens structure gradually appears in the lens design, although a common eight-piece lens has good optical performance, the focal power, the lens pitch and the lens shape setting still have certain irrationality, so that the design requirements of large aperture and ultra-thinness cannot be met while the lens structure has good optical performance.
Disclosure of Invention
In view of the above, the present invention provides an optical lens having good optical performance and satisfying design requirements of large aperture and ultra-thinness.
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 element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element;
the first lens element and the second lens element both 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 f 2; the central curvature radius of the object side surface of the third lens is R5, and the central curvature radius of the image side surface of the third lens is R6; an on-axis distance from an object-side surface of the sixth lens to an image-side surface is d11, and an on-axis distance from the image-side surface to an object-side surface of the seventh lens is d 12; and satisfies the following relationships:
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 first lens has a focal length f1, a center radius of curvature of the object-side surface R1, a center radius of curvature of the image-side surface R2, and an on-axis distance d1 from the object-side surface to the image-side surface; and satisfies the following relationships:
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 center radius of curvature of the object-side surface of the second lens is R3, the center radius of curvature of the image-side surface of the second lens is R4, and the on-axis distance from the object-side surface to the image-side surface is d 3; and satisfies the following relationships:
-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 d 5; and satisfies the following relationships:
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 is f4, and the on-axis distance from the object side surface to the image side surface is d 7; and satisfies the following relationships:
-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 fifth lens has a focal length f5, a center radius of curvature of the object side surface R9, a center radius of curvature of the image side surface R10, and an on-axis distance from the object side surface to the image side surface d 9; and satisfies the following relationships:
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, the on-axis distance from the object side surface to the image side surface of the sixth lens is d 11; and satisfies the following relationships:
0.053≤d11/TTL≤0.22。
further, the optical lens satisfies the following relation:
0.058≤d11/TTL≤0.17。
further, the seventh lens 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 distance from the object-side surface to the image-side surface d 13; and satisfies the following relationships:
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 eighth lens has a focal length f8, a central radius of curvature of the object-side surface R15, and a central radius of curvature of the image-side surface R16; and satisfies the following relationships:
-0.96≤8/f≤-0.73；
0.072≤(R17+R18)/(R17 R18)≤0.39。
further, the optical lens satisfies the following relation:
-0.91≤8/f≤-0.78；
0.12≤(R17+R18)/(R17 R18)≤0.34。
by adopting the technical scheme, the invention can bring the following beneficial effects:
the optical lens has good optical performance, and simultaneously meets the design requirements of large aperture and ultra-thinness; the lens is particularly suitable for a mobile phone camera lens assembly and a WEB camera lens which are composed of high-pixel CCD, CMOS and other camera elements.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present invention;
fig. 2 is a schematic view of axial aberrations of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating vertical axis chromatic aberration of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a diagram illustrating curvature of field and distortion of an optical lens according to a first embodiment of the present invention;
fig. 5 is a performance diagram of an optical lens according to the first embodiment of the present invention;
fig. 6 is a schematic structural diagram of an optical lens according to a second embodiment of the present invention;
fig. 7 is a schematic view of axial aberrations of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating vertical axis chromatic aberration of an optical lens according to a second embodiment of the present invention;
FIG. 9 is a diagram illustrating curvature of field and distortion of an optical lens according to a second embodiment of the present invention;
fig. 10 is a schematic performance diagram 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 a schematic view of axial aberrations of an optical lens according to a third embodiment of the present invention;
fig. 13 is a schematic view of vertical axis chromatic aberration of an optical lens according to a third embodiment of the present invention;
FIG. 14 is a diagram illustrating curvature of field and distortion of an optical lens according to a third embodiment of the present invention;
fig. 15 is a schematic performance diagram 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.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that various aspects of the embodiments are described below within the scope of the appended 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 disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects 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. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in practical implementation, and the type, quantity and proportion of the components in practical implementation can be changed freely, and the layout of the components can be more complicated.
In addition, in the following description, specific details are provided to facilitate 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, in order from an object side to an image side, includes: the 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 (filter) GF may be disposed between the eighth lens L8 and the image plane Si.
In this 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 element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7 and the eighth lens element L8 may have other refractive powers. In this embodiment, the first lens element L1 has positive refractive power, and the first lens element L1 has positive refractive power, which is helpful for improving the performance of the optical system.
In this 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 f 2; the central curvature radius of the object side surface of the third lens L3 is R5, and the central curvature radius of the image side surface of the third lens L3 is R6; an on-axis distance from an object-side surface to an image-side surface of the sixth lens L6 is d11, and an on-axis distance from the image-side surface to an object-side surface of the seventh lens L7 is d 12; and satisfies the following relationships:
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 ≦ 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 with 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 amount of curvature of field of the system.
The relation (3) stipulates the shape of the third lens L3, and the deflection degree of the light rays passing through the lens can be alleviated within the range of the relation (3), so that the aberration can be effectively reduced.
The relation (4) specifies the ratio of the on-axis thickness d11 of the sixth lens L6 to the on-axis distance d12 from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7, and (4) in the range of the relation contributes to the reduction of the total length of the optical system, thereby achieving the effect of making the optical system thinner.
When the above relationship is satisfied, the optical lens 10 has good optical performance and can satisfy design requirements of large aperture and ultra-thinness; in accordance with the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are configured by image pickup devices such as a high-pixel CCD and a CMOS.
In the present embodiment, the focal length of the first lens L1 is f1, the center radius of curvature of the object-side surface is R1, the center 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 d 1; and satisfies the following relationships:
1≤f1/f≤1.8；-3.2≤(R1+R2)/(R1 R2)≤-1.7；0.02≤d1/TTL≤0.13。
preferably, 1.2 ≤ f1/f ≤ 1.6; -3 ≤ (R1+ R2)/(R1R 2) is ≤ 1.9; d1/TTL is more than or equal to 0.04 and less than or equal to 0.11.
In the present embodiment, the center radius of curvature of the object-side surface of the second lens L2 is R3, the center radius of curvature of the image-side surface is R4, and the on-axis distance from the object-side surface to the image-side surface is d 3; and satisfies the following relationships:
-7.11≤(R3+R4)/(R3 R4)≤-0.19；0.01≤d3/TTL≤0.12。
preferably, -6.91 ≦ (R3+ R4)/(R3R 4) ≦ -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 L3 is d 5; and satisfies the following relationships:
0.02≤d5/TTL≤0.065。
preferably, 0.025. ltoreq. d 5/TTL. ltoreq.0.06.
In the present embodiment, the focal length of the fourth lens L4 is f4, and the on-axis distance from the object side to the image side is d 7; and satisfies the following relationships:
-0.9≤f4/f≤-0.4；0.019≤d7/TTL≤0.062。
preferably, -0.7. ltoreq. f 4/f. ltoreq-0.6; d7/TTL is more than or equal to 0.024 and less than or equal to 0.057.
In the present embodiment, the focal length of the fifth lens L5 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 d 9; and satisfies the following relationships:
0.72≤f5/f≤0.95；-0.91≤(R9+R10)/(R9 R10)≤-0.37；0.074≤d9/TTL≤0.099。
preferably, 0.77 ≦ f5/f ≦ 0.9; -0.86 ≦ (R9+ R10)/(R9R 10) ≦ -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 L6 is d 11; and satisfies the following relationships:
0.053≤d11/TTL≤0.22。
preferably, 0.058. ltoreq. d 11/TTL. ltoreq.0.17.
In the present embodiment, the focal length of the seventh lens L7 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 d 13; and satisfies the following relationships:
2.8≤f7/f≤8.41；-12.71≤(R13+R14)/(R13 R14)≤-1.155；0.074≤d13/TTL≤0.101。
preferably, 3 ≤ f7/f ≤ 8.21; -12.21 ≦ (R13+ R14)/(R13R 14) ≦ -1.655; d13/TTL is more than or equal to 0.079 and less than or equal to 0.096.
In the present embodiment, the focal length of the eighth lens 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 relationships:
-0.96≤8/f≤-0.73；0.072≤(R17+R18)/(R17 R18)≤0.39。
preferably, -0.91. ltoreq.8/f. ltoreq-0.78; 0.12-0.34 of (R17+ R18)/(R17R 18).
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 with 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, and can effectively balance the spherical aberration and the field curvature of the system.
The relation (3) stipulates the shape of the third lens L3, and the deflection degree of the light rays passing through the lens can be alleviated within the range of the relation (3), so that the aberration can be effectively reduced.
The relation (4) specifies the ratio of the on-axis thickness d11 of the sixth lens L6 to the on-axis distance d12 from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7, and (4) in the range of the relation contributes to the reduction of the total length of the optical system, thereby achieving the effect of making the optical system thinner.
When the above relationship is satisfied, the optical lens 10 has good optical performance and can satisfy design requirements of large aperture and ultra-thinness; in accordance with the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are configured by image pickup devices such as a high-pixel CCD and a CMOS.
The optical lens 10 of the present invention will be explained below by way of example. The symbols described in the respective examples are as follows. The unit of focal length, on-axis distance, center curvature radius, on-axis thickness, position of the reverse curvature point and the position of the stagnation point is mm.
TTL: the total optical length (on-axis distance from the object side surface of the first lens L1 to the image plane Si) is in mm;
aperture value FNO: refers to the ratio of the effective focal length and the entrance pupil diameter of the optical lens 10.
Specific lens design data, aspheric surface data, inflection point design data and stagnation 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 are schematic diagrams showing axial aberration and vertical chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm after passing through the optical lens 10 according to the first embodiment. Fig. 4 is a schematic diagram showing the curvature of field and distortion of light with a wavelength of 555nm after passing through the optical lens 10 of the first embodiment, where the curvature of field 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 shows a schematic diagram of MTF versus spatial frequency after the optical lens 10 of the first embodiment.
[ TABLE 1 ]
[ TABLE 2 ]
[ TABLE 3 ]
[ TABLE 4 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| P3R2 | 1 | 0.555 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| P7R1 | 1 | 1.335 | 0 |
| P7R2 | 1 | 1.055 | 0 |
| |
0 | 0 | 0 |
| P8R2 | 1 | 1.215 | 0 |
In each table, each symbol has the following meaning.
S1: an aperture; r: a radius of curvature at the center of the optical surface; r1: the center radius of curvature of the object side of the first lens L1; r2: the central radius of curvature of the image-side surface of the first lens L1; r3: the center radius of curvature of the object side of the second lens L2; r4: the central radius of curvature of the image-side surface of the second lens L2; r5: the center radius of curvature of the object side of the third lens L3; r6: the central radius of curvature of the image-side surface of the third lens L3; r7: the center radius of curvature of the object side of the fourth lens L4; r8: the central radius of curvature of the image-side surface of the fourth lens L4; r9: the center radius of curvature of the object side of the fifth lens L5; r10: the center radius of curvature of the image-side surface of the fifth lens L5; r11: the center radius of curvature of the object side of the sixth lens L6; r12: the center radius of curvature of the image-side surface of the sixth lens L6; r13: the center radius of curvature of the object side of the seventh lens L7; r14: the central radius of curvature of the image-side surface of the seventh lens L7; r15: the center radius of curvature of the object side of the eighth lens L8; r16: the center radius of curvature of the image-side surface of the eighth lens L8; r17: the central radius of curvature of the object side 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; 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: an on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8; d 15: the on-axis thickness of the eighth lens L8; d 16: the on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF; d 17: on-axis thickness of the optical filter GF; d 18: the axial distance from the image side surface of the optical filter GF to the image surface Si; 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; nd 8: the refractive index of the d-line of the eighth lens L8; ndg: the refractive index of the d-line of the optical filter GF; vd: an Abbe number; vd 1: abbe number of the first lens L1; vd 2: abbe number of the second lens L2; vd 3: abbe number of the third lens L3; vd 4: abbe number of the fourth lens L4; vd 5: abbe number of the fifth lens L5; vd 6: abbe number of the sixth lens L6; vd 7: abbe number of the seventh lens L7; vd 8: abbe number of the eighth lens L8; vdg: abbe number of the optical filter GF. 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, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8, respectively. The "inflection point position" corresponds to data of a vertical distance from an inflection point set on each lens surface to an optical axis of the optical lens. The "stagnation position" corresponding data is the vertical distance from the stagnation 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 height IH of a full field of view is 6.000mm, the FOV is the angle of view in a diagonal direction, the embodiments of the optical lens meet the design requirements of large aperture and ultra-thinness, the on-axis and off-axis chromatic aberration is fully corrected, and the optical lens has excellent optical characteristics.
(second embodiment)
The structure diagram of the image pickup optical mirror 20 of the present embodiment is shown in fig. 6, and is the same as the first embodiment except for the differences in the relevant parameters in tables 5 to 8, and therefore overlapping portions are not described again.
Specific lens design data, aspherical surface data, inflection point design data, and stagnation point design data are shown in tables 5, 6, 7, and 8, respectively. Fig. 7 and 8 are schematic diagrams showing axial aberration and vertical chromatic aberration of light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm after passing through the optical lens 20. Fig. 9 is a schematic diagram showing the curvature of field and distortion of light with a wavelength of 555nm after passing through the optical lens 20 of the second embodiment, where 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 shows a schematic diagram of MTF versus spatial frequency after the optical lens 20 of the second embodiment.
[ TABLE 5 ]
[ TABLE 6 ]
[ TABLE 7 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Position of |
|
| |
0 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 |
| P2R2 | 2 | 1.205 | 1.405 | 0 |
| |
0 | 0 | 0 | 0 |
| P3R2 | 2 | 1.135 | 1.345 | 0 |
| |
0 | 0 | 0 | 0 |
| |
0 | 0 | 0 | 0 |
| P5R1 | 1 | 1.305 | 0 | 0 |
| |
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 |
| |
3 | 0.635 | 1.685 | 2.245 |
[ TABLE 8 ]
(third embodiment)
The structure diagram of the image pickup optical mirror 30 of the present embodiment is shown in fig. 11, and is the same as the first embodiment except for the differences in the relevant parameters in tables 9 to 12, and therefore overlapping portions are not described again.
Specific lens design data, aspherical surface data, inflection point design data, and stagnation point design data are shown in tables 9, 10, 11, and 12, respectively. Fig. 12 and 13 are schematic diagrams showing axial aberrations and vertical chromatic aberrations of light with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the optical lens 20, respectively. Fig. 14 is a schematic view showing curvature of field and distortion of light with a wavelength of 555nm after passing through the optical lens according to the third embodiment, where S is curvature of field in sagittal direction and T is curvature of field in meridional direction in fig. 14; fig. 15 shows a schematic diagram of MTF versus spatial frequency after the optical lens 30 of the third embodiment.
[ TABLE 9 ]
[ TABLE 10 ]
[ TABLE 11 ]
[ TABLE 12 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| |
0 | 0 | 0 |
| P7R1 | 1 | 1.055 | 0 |
| P7R2 | 1 | 0.525 | 0 |
| |
0 | 0 | 0 |
| P8R2 | 1 | 2.365 | 0 |
Table 13 shows that the above embodiments satisfy the respective conditional expressions.
[ TABLE 13 ]
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (18)
1. An optical lens assembly, in order from an object side to an image side, comprising: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element;
the first lens element and the second lens element both 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 f 2; the central curvature radius of the object side surface of the third lens is R5, and the central curvature radius of the image side surface of the third lens is R6; an on-axis distance from an object-side surface of the sixth lens to an image-side surface is d11, and an on-axis distance from the image-side surface to an object-side surface of the seventh lens is d 12; and satisfies the following relationships:
0.75≤f/TTL；
0.8≤f2/f≤8.2；
-3.2≤(R5+R6)/(R5 R6)≤-0.3；
0.8≤d11/d12≤8.2。
2. an optical lens according to claim 1, wherein 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。
3. the optical lens of claim 1, wherein the first lens has a focal length of f1, a center radius of curvature of the object-side surface of R1, a center radius of curvature of the image-side surface of R2, and an on-axis object-side-to-image-side distance of d 1; and satisfies the following relationships:
1≤f1/f≤1.8；
-3.2≤(R1+R2)/(R1 R2)≤-1.7；
0.02≤d1/TTL≤0.13。
4. an optical lens according to claim 3, wherein 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。
5. an optical lens barrel according to claim 1, wherein the second lens has a central radius of curvature of the object side surface of R3, a central radius of curvature of the image side surface of R4, and an on-axis object-side-to-image-side distance of d 3; and satisfies the following relationships:
-7.11≤(R3+R4)/(R3 R4)≤-0.19；
0.01≤d3/TTL≤0.12。
6. an optical lens according to claim 5, wherein the optical lens satisfies the following relation:
-6.91≤(R3+R4)/(R3 R4)≤-0.39；
0.03≤d3/TTL≤0.1。
7. an optical lens barrel according to claim 1, wherein the on-axis distance from the object side surface to the image side surface of the third lens is d 5; and satisfies the following relationships:
0.02≤d5/TTL≤0.065。
8. an optical lens according to claim 7, wherein the optical lens satisfies the following relation:
0.025≤d5/TTL≤0.06。
9. an optical lens barrel according to claim 1, wherein the fourth lens has a focal length f4 and an on-axis object-side to image-side distance d 7; and satisfies the following relationships:
-0.9≤f4/f≤-0.4；
0.019≤d7/TTL≤0.062。
10. an optical lens according to claim 9, wherein the optical lens satisfies the following relation:
-0.7≤f4/f≤-0.6；
0.024≤d7/TTL≤0.057。
11. an optical lens barrel according to claim 1, wherein the fifth lens element has a focal length f5, a center radius of curvature of the object side surface R9, a center radius of curvature of the image side surface R10, and an on-axis object-side-to-image-side distance d 9; and satisfies the following relationships:
0.72≤f5/f≤0.95；
-0.91≤(R9+R10)/(R9 R10)≤-0.37；
0.074≤d9/TTL≤0.099。
12. an optical lens according to claim 11, wherein 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。
13. an optical lens barrel according to claim 1, wherein the sixth lens element has an on-axis distance d11 from the object-side surface to the image-side surface; and satisfies the following relationships:
0.053≤d11/TTL≤0.22。
14. an optical lens according to claim 13, wherein the optical lens satisfies the following relation:
0.058≤d11/TTL≤0.17。
15. an optical lens barrel according to claim 1, wherein the seventh lens element has a focal length f7, a central radius of curvature of the object side surface R13, a central radius of curvature of the image side surface R14, and an on-axis object-side-to-image-side distance d 13; and satisfies the following relationships:
2.8≤f7/f≤8.41；
-12.71≤(R13+R14)/(R13 R14)≤-1.155；
0.074≤d13/TTL≤0.101。
16. an optical lens according to claim 15, 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。
17. an optical lens barrel according to claim 1, wherein the eighth lens element has a focal length f8, a central radius of curvature of the object side surface of R15, and a central radius of curvature of the image side surface of R16; and satisfies the following relationships:
-0.96≤8/f≤-0.73；
0.072≤(R17+R18)/(R17 R18)≤0.39。
18. an optical lens according to claim 17, wherein the optical lens satisfies the following relationship:
-0.91≤8/f≤-0.78；
0.12≤(R17+R18)/(R17 R18)≤0.34。
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| CN111077650A (en) * | 2019-12-23 | 2020-04-28 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
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