CN116466475B - Optical lens and driving tool with same - Google Patents

Optical lens and driving tool with same Download PDF

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Publication number
CN116466475B
CN116466475B CN202310725334.4A CN202310725334A CN116466475B CN 116466475 B CN116466475 B CN 116466475B CN 202310725334 A CN202310725334 A CN 202310725334A CN 116466475 B CN116466475 B CN 116466475B
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China
Prior art keywords
lens
optical
object side
optical lens
image
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CN116466475A (en
Inventor
洪坚
罗艳波
杨井留
安宁
崔海波
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Sirtec International Suzhou Co ltd
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Sirtec International Suzhou Co ltd
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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
    • 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
    • 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
    • G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The application discloses an optical lens and a driving tool, wherein the optical lens comprises the following components in sequence along an optical axis from an object plane to an image plane: the first lens with positive focal power has a convex object side surface structure; a second lens with negative focal power, wherein the image side surface of the second lens is in a concave structure; the object side surface of the third lens with positive focal power is in a convex structure, and the image side surface of the third lens is in a convex structure; the object side surface of the fourth lens is in a concave structure; a fifth lens with negative focal power, wherein an image side surface of the fifth lens has a concave structure; a sixth lens with positive focal power, wherein the object side surface of the sixth lens is in a convex structure; a seventh lens having positive or negative optical power; the image side surface of the sixth lens is in a convex structure, and the object side surface of the seventh lens is in a concave structure; or, the image side surface of the sixth lens element is concave, and the object side surface of the seventh lens element is convex; the object side surface of the eighth lens with negative focal power is in a concave structure. The optical lens has small distortion, clear image and low cost.

Description

Optical lens and driving tool with same
Technical Field
The present disclosure relates to optical systems, and particularly to an optical lens and a driving tool with the same.
Background
In recent years, with the development of vehicle-mounted technology, technical requirements for a forward-looking image pickup device, an auto-cruise device, a vehicle recorder and a vehicle-mounted camera are increasing. The front-view vehicle-mounted lens is an important component part in the advanced driver auxiliary system, and a driver can find out an obstacle in front of the vehicle through the front-view vehicle-mounted lens, so that driving accidents are avoided. However, in order to improve the resolution of the conventional 8M front view camera lens, 1-3 aspherical glass molding lenses are generally used, and compared with the common glass spherical lens, the aspherical glass molding lenses are not easy to process and manufacture, and the cost of the grinding tool is increased along with the increase of the yield, so that the cost is high.
Disclosure of Invention
The application aims to solve the problems in the prior art and provides an optical lens which can achieve resolution, processing and manufacturing as well as cost.
In order to achieve the above purpose, the application adopts the following technical scheme:
an optical lens comprises 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 which are sequentially arranged along an optical axis from an object plane to an image plane,
the object side surface of the first lens is in a convex structure, and the first lens has positive focal power;
the image side surface of the second lens is in a concave structure, and the second lens has negative focal power;
the object side surface of the third lens is in a convex structure, the image side surface of the third lens is in a convex structure, and the third lens has positive focal power;
the object side surface of the fourth lens is in a concave structure, and the fourth lens has negative focal power;
the image side surface of the fifth lens is in a concave structure, and the fifth lens has negative focal power;
the object side surface of the sixth lens is in a convex structure, and the sixth lens has positive focal power;
the seventh lens has positive optical power or negative optical power;
the image side surface of the sixth lens is in a convex structure, and the object side surface of the seventh lens is in a concave structure; or, the image side surface of the sixth lens element has a concave structure, and the object side surface of the seventh lens element has a convex structure;
the object side surface of the eighth lens is in a concave structure, and the eighth lens has negative focal power;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all glass spherical lenses.
Further, in any one or a combination of the foregoing aspects, the second lens, the third lens and the fourth lens are sequentially cemented in pairs to form a triple cemented lens. Therefore, the number of lenses and space rings can be reduced, assembly parts can be simplified, and the production efficiency and the production yield are improved.
Further, in the foregoing any one or a combination of the foregoing aspects, the fifth lens, the sixth lens, and the seventh lens are sequentially cemented in pairs to form a triple cemented lens. Therefore, the number of lenses and space rings can be reduced, assembly parts can be simplified, and the production efficiency and the production yield are improved.
Further, in the foregoing any one or a combination of the foregoing any one or more aspects, the second lens, the third lens, and the fourth lens are sequentially cemented in pairs to form a triple cemented lens, and the fifth lens, the sixth lens, and the seventh lens are sequentially cemented in pairs to form a triple cemented lens. Therefore, the number of lenses and space rings of the optical lens is greatly reduced, the sensitivity is greatly reduced, the assembly parts are simplified, and the production efficiency and the production yield can be improved.
Further, in the combination of any one or more of the foregoing aspects, adjacent two of the second lens, the third lens and the fourth lens are cemented to form a cemented doublet, and/or adjacent two of the fifth lens, the sixth lens and the seventh lens are cemented to form a cemented doublet. The formation of the double-cemented lens can reduce or eliminate chromatic aberration, improve imaging quality, improve the lens transmissivity and reduce assembly difficulty.
Further, according to any one or more of the foregoing technical solutions, an image side surface of the first lens element is in a convex structure, a concave structure, or a planar structure, an object side surface of the second lens element is in a concave structure or a planar structure, an image side surface of the fourth lens element is in a convex structure or a planar structure, an object side surface of the fifth lens element is in a convex structure or a planar structure, and an image side surface of the eighth lens element is in a convex structure, a concave structure, or a planar structure.
Further, in any one or a combination of the foregoing aspects, the focal length f of the optical lens satisfies the condition: 0.75< (BFL/TTL) × (FOV/h/D) × (FOV×f/h) × (TTL/f) <12, wherein FOV is the maximum field angle of the optical lens, D is the maximum aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, h is the image height corresponding to the maximum field angle of the optical lens, BFL is the distance from the center of the image side surface of the eighth lens to the imaging surface of the optical lens on the optical axis, and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis.
Further, any one or a combination of the foregoing technical solutions, the optical lens satisfies the following conditions: BFL is the distance between the center of the image side surface of the eighth lens and the imaging surface of the optical lens on the optical axis, wherein BFL is more than or equal to 0.05 and less than or equal to 0.2; TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis.
Preferably, 0.1 < BFL/TTL.ltoreq.0.2. This is advantageous in increasing the optical back focus of the optical lens, thereby allowing sufficient space for the module.
Further, any one or a combination of the foregoing technical solutions, the optical lens satisfies the following conditions: FOV/h/D is more than or equal to 0.2 and less than or equal to 0.4, wherein FOV is the maximum view angle of the optical lens, D is the maximum aperture of the object side surface of the first lens corresponding to the maximum view angle of the optical lens, and h is the image height corresponding to the maximum view angle of the optical lens. This is advantageous for realizing a small aperture of the optical lens.
Further, any one or a combination of the foregoing technical solutions, the optical lens satisfies the following conditions: and the FOV is less than or equal to 50 and less than or equal to 60, wherein the FOV is the maximum view field angle of the optical lens, f is the focal length of the optical lens, and h is the image height corresponding to the maximum view field angle of the optical lens. This facilitates reducing the optical lens distortion.
Further, any one or a combination of the foregoing technical solutions, the optical lens satisfies the following conditions: 1.5 is less than or equal to TTL/f is less than or equal to 2.5, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and f is the focal length of the optical lens.
Preferably, 1.5.ltoreq.TTL/f.ltoreq.2.0. This is advantageous in downsizing of the optical lens.
Further, in any one or a combination of the foregoing aspects, the focal length of the optical lens satisfies the condition: -1.5.ltoreq.f2/f.ltoreq.0, 0.1.ltoreq.f6/f.ltoreq.2, -1.5.ltoreq.f8/f.ltoreq.0, wherein f2 is the focal length of the second lens, f6 is the focal length of the sixth lens, f8 is the focal length of the eighth lens, and f is the focal length of the optical lens. By reasonably matching the focal length of the lens, the assembly sensitivity is reduced, the Jiao Piaoyi of the lens at high and low temperatures is controlled in a small range, and clear imaging is achieved.
Further, in any one or a combination of the foregoing embodiments, the refractive index of the third lens is less than 1.6, the abbe constant is greater than 65, and the refractive index temperature coefficient of the third lens is less than-6×10 -6 Glass material at/deg.c. This counteracts the high temperature focal plane deflection object plane effects caused by the high refractive index, high abbe material positive refractive index, temperature coefficient.
In another aspect of the application, a steering tool is provided, comprising an optical lens as described above, the steering tool being a vehicle, a vessel, an aircraft or a drone.
The technical scheme provided by the application has the following beneficial effects:
the optical lens of the application does not use the aspherical glass molding lens, can realize the resolution of 8M by only using 8 common glass spherical lenses, has smaller optical field curvature, smaller distortion, clear image and low cost, and solves the problems of high cost and complex processing caused by the need of using the glass aspherical molding lens in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
Fig. 1 is a schematic view of a lens arrangement of an optical lens of embodiment 1 of the present application;
FIG. 2 is a graph showing a field curvature of an optical lens according to embodiment 1 of the present application;
FIG. 3 is a graph showing distortion curves of an optical lens according to embodiment 1 of the present application;
FIG. 4 is a graph of MTF defocus curves for an optical lens of example 1 of the present application;
fig. 5 is a lens arrangement diagram of an optical lens according to embodiment 2 of the present application;
FIG. 6 is a graph showing a field curvature of an optical lens according to embodiment 2 of the present application;
fig. 7 is a distortion graph of an optical lens according to embodiment 2 of the present application;
fig. 8 is an MTF defocus graph of the optical lens of example 2 of the present application.
Wherein: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a sixth lens; 7. a seventh lens; 8. an eighth lens; 9. an IR filter; 10. IMA protective glass;
s1, an object side surface of a first lens; s2, an image side surface of the first lens; s3, a diaphragm; s4, the object side surface of the second lens; s5, the image side surface of the second lens/the object side surface of the third lens; s6, an image side surface of the third lens element/an object side surface of the fourth lens element; s7, an image side surface of the fourth lens; s8, the object side surface of the fifth lens is provided; s9, an image side surface of the fifth lens element/an object side surface of the sixth lens element; s10, an image side surface of the sixth lens/an object side surface of the seventh lens; s11, an image side surface of the seventh lens; s12, an object side surface of the eighth lens; s13, an image side surface of the eighth lens.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or device.
Example 1
As shown in fig. 1, the optical lens of the present embodiment includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8, which are disposed in order along an optical axis from an object plane to an image plane.
The first lens 1 has positive focal power, and an object side surface S1 of the first lens 1 has a convex structure. In the present embodiment, the image side surface S2 of the first lens element has a concave structure, and the image side surface S2 of the first lens element 1 can have a convex structure or a planar structure.
The second lens 2 has negative focal power, and an image side surface S5 of the second lens 2 has a concave structure. In the present embodiment, the object-side surface S4 of the second lens element 2 has a concave structure, and the object-side surface S4 of the second lens element 2 can also have a planar structure.
The third lens element 3 has positive refractive power, wherein an object-side surface S5 of the third lens element 3 has a convex structure, and an image-side surface S6 thereof has a convex structure.
The fourth lens element 4 has negative refractive power, and an object-side surface S6 of the fourth lens element 4 has a concave structure. In the present embodiment, the image-side surface S7 of the fourth lens element 4 has a convex structure, and the image-side surface S7 of the fourth lens element 4 can also have a planar structure.
The fifth lens element 5 has a negative refractive power, and an image-side surface S9 of the fifth lens element 5 has a concave structure. In the embodiment, the object side surface S8 of the fifth lens element 5 has a convex structure, and the object side surface S8 of the fifth lens element 5 can also have a planar structure.
The sixth lens element 6 has a positive refractive power, wherein an object-side surface S9 of the sixth lens element 6 has a convex structure, and an image-side surface S10 thereof has a convex structure.
The seventh lens 7 has positive or negative optical power, and an object side surface S10 of the seventh lens 7 has a concave structure. In the present embodiment, the image side surface S11 of the seventh lens element 7 has a concave structure, and the image side surface S11 of the seventh lens element 7 may have a convex structure or a planar structure.
The eighth lens element 8 has negative refractive power, and an object-side surface S12 of the eighth lens element 8 has a concave structure. In the present embodiment, the image side surface S13 of the eighth lens element 8 has a concave structure, and the image side surface S13 of the eighth lens element 8 can have a convex structure or a planar structure.
The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 are all glass spherical lenses. Therefore, the optical lens can realize the resolution of 8M by only using 8 common glass spherical lenses, and can solve the problems of high cost and complex processing caused by using glass aspheric molded lenses in the prior art.
Two adjacent ones of the second lens 2, the third lens 3 and the fourth lens 4 may be cemented to form a cemented doublet, and/or two adjacent ones of the fifth lens 5, the sixth lens 6 and the seventh lens 7 may be cemented to form a cemented doublet. The formation of the double-cemented lens can reduce or eliminate chromatic aberration, improve imaging quality, improve the lens transmissivity and reduce assembly difficulty.
Alternatively, the second lens 2, the third lens 3 and the fourth lens 4 may be bonded together two by two in sequence to form a cemented lens, and/or the fifth lens 5, the sixth lens 6 and the seventh lens 7 may be bonded together two by two in sequence to form a cemented lens. Preferably, the second lens 2, the third lens 3 and the fourth lens 4 are sequentially bonded in pairs to form a three-bonded lens, and the fifth lens 5, the sixth lens 6 and the seventh lens 7 are sequentially bonded in pairs to form a three-bonded lens. Therefore, the optical lens has only 4 lenses, wherein the 4 lenses comprise 2 groups of three glued lenses, 3 or even 2 space rings, and compared with the 8M front view lens in the prior art generally comprises 7-8 lenses and 5-6 space rings, the sensitivity is greatly reduced, the assembly parts are simplified, and the production efficiency and the production yield can be improved.
The refractive index Nd3 of the third lens 3 is smaller than 1.6, the Abbe constant Vd3 is larger than 65, and the refractive index temperature coefficient of the third lens 3 is smaller than-6 x 10 -6 Glass material at/deg.c. This counteracts the high temperature focal plane deflection object plane effects caused by the high refractive index, high abbe material positive refractive index, temperature coefficient.
In this embodiment, the optical parameters of the optical lens include: the maximum field angle FOV, the maximum aperture D of the object side surface of the first lens element 1 corresponding to the maximum field angle, the image height h corresponding to the maximum field angle, the distance BFL between the center of the image side surface of the eighth lens element 8 and the imaging surface of the optical lens element on the optical axis, the distance TTL between the center of the object side surface of the first lens element 1 and the imaging surface of the optical lens element on the optical axis, and the focal length f of the optical lens element.
The optical parameters of the optical lens need to meet the following conditions:
0.75<(BFL/TTL)×(FOV/h/D)×(FOV×f/h)×(TTL/f)<12 （1）
the focal length f of the optical lens needs to meet the requirement of the formula (1).
BFL/TTL of 0.05.ltoreq.BFL.ltoreq.0.2, preferably 0.1 < BFL/TTL.ltoreq.0.2 (2)
Controlling the BFL and TTL parameters to satisfy equation (2) is beneficial to increasing the optical back focus of the optical lens, thereby leaving sufficient space for the module.
0.2≤FOV/h/D≤0.4 （3）
The three parameters of FOV, h and D are controlled to meet the formula (3), which is beneficial to realizing small caliber of the optical lens.
50≤FOV×f/h≤60 （4）
Controlling the three parameters FOV, f and h satisfies equation (4), which is beneficial for reducing the optical lens distortion.
TTL/f is 1.5.ltoreq.TTL/f is 2.5.ltoreq.TTL/f is preferably 1.5.ltoreq.TTL/f is 2.0 (5)
And two parameters of TTL and f are controlled to meet the formula (5), so that the miniaturization of the optical lens is facilitated.
In this embodiment, the focal length f2 of the second lens 2 and the focal length f of the optical lens should satisfy-1.5.ltoreq.f2/f.ltoreq.0, the focal length f6 of the sixth lens 6 and the focal length f of the optical lens should satisfy 0.1.ltoreq.f6/f.ltoreq.2, and the focal length f8 of the eighth lens 8 and the focal length f of the optical lens should satisfy-1.5.ltoreq.f8/f.ltoreq.0. Therefore, the assembling sensitivity can be reduced by reasonably matching the focal length of each lens, so that the Jiao Piaoyi of the optical lens is controlled in a very small range after the optical lens is at high and low temperature, and the requirement of clear imaging is met.
In this example, the optical parameters of a particular individual lens, diaphragm S3, IR filter 9 and IMA cover glass 10 are given, see in particular Table 1-1.
In Table 1-1, the radii of curvature of the surfaces of the diaphragm S3, the IR filter 9 and the cover glass 10 are infinite, indicating that the surfaces are planar.
The optical parameters of a specific optical lens are given in this example, and are shown in tables 1-2.
The field curvature curve of the optical lens of this embodiment is shown in fig. 2, the ordinate of the field curvature curve is the angle of view, the abscissa is the distance of the image point from the paraxial image plane, T represents the meridian field curvature, S represents the sagittal field curvature, and the field curvature curve shows the current focal plane or the distance of the image plane from the paraxial focal plane as a function of the field of view coordinates, and is divided into the meridian field curvature and the sagittal field curvature.
The distortion curve of the optical lens in this embodiment is shown in fig. 3, the ordinate of the distortion curve is the angle of view, the abscissa is the distortion percentage, the distortion belongs to the aberration of the chief ray, and reflects the similarity of the object image, and the optical lens in this embodiment has smaller optical field curvature, smaller distortion and clear image.
The MTF defocus curve of the optical lens of this embodiment is shown in fig. 4, where the ordinate of the MTF defocus curve is the MTF value, the abscissa is the distance of the image point from the paraxial image plane, and the MTF defocus curve of the lens reflects the resolution of the lens, and in the optical lens of this embodiment, the MTF defocus curve of 119LP is concentrated and the MTF value is high, which can reflect that the resolution of the lens is high, the imaging is clear, and the 8M use requirement is satisfied.
Example 2
As shown in fig. 5, the optical lens of the present embodiment includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8, which are disposed in order along the optical axis from the object plane to the image plane.
The first lens 1 has positive focal power, and an object side surface S1 of the first lens 1 has a convex structure. In the present embodiment, the image side surface S2 of the first lens element has a concave structure, and the image side surface S2 of the first lens element 1 can have a convex structure or a planar structure.
The second lens 2 has negative focal power, and an image side surface S5 of the second lens 2 has a concave structure. In the present embodiment, the object-side surface S4 of the second lens element 2 has a concave structure, and the object-side surface S4 of the second lens element 2 can also have a planar structure.
The third lens element 3 has positive refractive power, wherein an object-side surface S5 of the third lens element 3 has a convex structure, and an image-side surface S6 thereof has a convex structure.
The fourth lens element 4 has negative refractive power, and an object-side surface S6 of the fourth lens element 4 has a concave structure. In the present embodiment, the image-side surface S7 of the fourth lens element 4 has a convex structure, and the image-side surface S7 of the fourth lens element 4 can also have a planar structure.
The fifth lens element 5 has a negative refractive power, and an image-side surface S9 of the fifth lens element 5 has a concave structure. In the embodiment, the object side surface S8 of the fifth lens element 5 has a convex structure, and the object side surface S8 of the fifth lens element 5 can also have a planar structure.
The sixth lens element 6 has a positive refractive power, wherein an object-side surface S9 of the sixth lens element 6 has a convex structure, and an image-side surface S10 thereof has a concave structure.
The seventh lens 7 has positive or negative power, and an object side surface S10 of the seventh lens 7 has a convex structure. In the present embodiment, the image side surface S11 of the seventh lens element 7 has a concave structure, and the image side surface S11 of the seventh lens element 7 may have a convex structure or a planar structure.
The eighth lens element 8 has negative refractive power, and an object-side surface S12 of the eighth lens element 8 has a concave structure. In the present embodiment, the image side surface S13 of the eighth lens element 8 has a concave structure, and the image side surface S13 of the eighth lens element 8 can have a convex structure or a planar structure.
The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 are all glass spherical lenses. Therefore, the optical lens can realize 8M resolution by only using 8 common glass spherical lenses, and solves the problems of high cost and complex processing of using glass aspherical lenses in the prior art.
Two adjacent ones of the second lens 2, the third lens 3 and the fourth lens 4 may be cemented to form a cemented doublet, and/or two adjacent ones of the fifth lens 5, the sixth lens 6 and the seventh lens 7 may be cemented to form a cemented doublet. The formation of the double-cemented lens can reduce or eliminate chromatic aberration, improve imaging quality, improve the lens transmissivity and reduce assembly difficulty.
Alternatively, the second lens 2, the third lens 3 and the fourth lens 4 may be bonded together two by two in sequence to form a cemented lens, and/or the fifth lens 5, the sixth lens 6 and the seventh lens 7 may be bonded together two by two in sequence to form a cemented lens. Preferably, the second lens 2, the third lens 3 and the fourth lens 4 are sequentially bonded in pairs to form a three-bonded lens, and the fifth lens 5, the sixth lens 6 and the seventh lens 7 are sequentially bonded in pairs to form a three-bonded lens. Therefore, the optical lens has only 4 lenses, wherein the 4 lenses comprise 2 groups of three glued lenses, 3 or even 2 space rings, and compared with the 8M front view lens in the prior art generally comprises 7-8 lenses and 5-6 space rings, the sensitivity is greatly reduced, the assembly parts are simplified, and the production efficiency and the production yield can be improved.
The refractive index Nd3 of the third lens 3 is smaller than 1.6, the Abbe constant Vd3 is larger than 65, and the refractive index temperature coefficient of the third lens 3 is smaller than-6 x 10 -6 Glass material at/deg.c. This counteracts the high temperature focal plane deflection object plane effects caused by the high refractive index, high abbe material positive refractive index, temperature coefficient.
In this embodiment, the optical parameters of the optical lens include: the maximum field angle FOV, the maximum aperture D of the object side surface of the first lens element 1 corresponding to the maximum field angle, the image height h corresponding to the maximum field angle, the distance BFL between the center of the image side surface of the eighth lens element 8 and the imaging surface of the optical lens element on the optical axis, the distance TTL between the center of the object side surface of the first lens element 1 and the imaging surface of the optical lens element on the optical axis, and the focal length f of the optical lens element.
The optical parameters of the optical lens need to meet the following conditions:
0.75<(BFL/TTL)×(FOV/h/D)×(FOV×f/h)×(TTL/f)<12 （6）
the focal length f of the optical lens needs to meet the requirement of the formula (6).
BFL/TTL 0.05. Ltoreq.BFL/TTL 0.2, preferably 0.1 < BFL/TTL 0.2 (7)
Controlling both BFL and TTL parameters to satisfy equation (7) is beneficial to increasing the optical back focus of the optical lens, thereby leaving sufficient space for the module.
0.2≤FOV/h/D≤0.4 （8）
The three parameters of FOV, h and D are controlled to meet the formula (8), which is beneficial to realizing small caliber of the optical lens.
50≤FOV×f/h≤60 （9）
Controlling the three parameters FOV, f and h satisfies equation (9), which facilitates reducing the optical lens distortion.
TTL/f is 1.5.ltoreq.TTL/f is 2.5.ltoreq.TTL/f is preferably 1.5.ltoreq.TTL/f is 2.0 (10)
The TTL and f parameters are controlled to meet the formula (10), so that the miniaturization of the optical lens is facilitated.
In this embodiment, the focal length f2 of the second lens 2 and the focal length f of the optical lens should satisfy-1.5.ltoreq.f2/f.ltoreq.0, the focal length f6 of the sixth lens 6 and the focal length f of the optical lens should satisfy 0.1.ltoreq.f6/f.ltoreq.2, and the focal length f8 of the eighth lens 8 and the focal length f of the optical lens should satisfy-1.5.ltoreq.f8/f.ltoreq.0. Therefore, the assembling sensitivity can be reduced by reasonably matching the focal length of each lens, so that the Jiao Piaoyi of the optical lens is controlled in a very small range after the optical lens is at high and low temperature, and the requirement of clear imaging is met.
In this example, the optical parameters of a particular individual lens, stop S3, IR filter 9 and IMA cover glass 10 are given, see in particular Table 2-1.
In Table 2-1, the radii of curvature of the surfaces of the diaphragm S3, the IR filter 9 and the IMA protective glass 10 are infinite, indicating that the surfaces are planar.
The optical parameters of a specific optical lens are shown in Table 2-2.
The field curvature graph of the optical lens of this embodiment is shown in fig. 6, in which the ordinate of the field curvature graph is the field angle, the abscissa is the distance by which an image point deviates from the paraxial image plane, T represents the meridian field curvature, S represents the sagittal field curvature, and the field curvature graph shows the current focal plane or the distance from the image plane to the paraxial focal plane as a function of the field coordinates, and is divided into the meridian field curvature and the sagittal field curvature.
The distortion curve of the optical lens in this embodiment is shown in fig. 7, the ordinate of the distortion curve is the angle of view, the abscissa is the distortion percentage, the distortion belongs to the aberration of the chief ray, and reflects the similarity of the object image, and the optical lens in this embodiment has smaller optical field curvature, smaller distortion and clear image.
The MTF defocus curve of the optical lens of this embodiment is shown in fig. 8, where the ordinate of the MTF defocus curve is the MTF value, the abscissa is the distance of the image point from the paraxial image plane, and the MTF defocus curve of the lens reflects the resolution of the lens, and in the optical lens of this embodiment, the MTF defocus curve of 119LP is concentrated and the MTF value is high, which can reflect that the resolution of the lens is high, the imaging is clear, and the 8M use requirement is satisfied.
The application also provides a steering tool which comprises the optical lens, and the steering tool can be a vehicle, a ship, an airplane or an unmanned aerial vehicle.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely illustrative of the embodiments of this application and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the application, and it is intended to cover all modifications and variations as fall within the scope of the application.

Claims (12)

1. An optical lens, has lens of focal power to be eight, includes along the optical axis from object plane to image plane direction setting gradually first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens, its characterized in that:
the object side surface of the first lens is in a convex structure, and the first lens has positive focal power;
the image side surface of the second lens is in a concave structure, and the second lens has negative focal power;
the object side surface of the third lens is in a convex structure, the image side surface of the third lens is in a convex structure, and the third lens has positive focal power;
the object side surface of the fourth lens is in a concave structure, and the fourth lens has negative focal power;
the image side surface of the fifth lens is in a concave structure, and the fifth lens has negative focal power;
the object side surface of the sixth lens is in a convex structure, and the sixth lens has positive focal power;
the seventh lens has positive optical power or negative optical power;
the image side surface of the sixth lens is in a convex structure, and the object side surface of the seventh lens is in a concave structure; or, the image side surface of the sixth lens element has a concave structure, and the object side surface of the seventh lens element has a convex structure;
the object side surface of the eighth lens is in a concave structure, and the eighth lens has negative focal power;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all glass spherical lenses;
the focal length f of the optical lens satisfies the condition:
0.75<(BFL/TTL)×(FOV/h/D)×(FOV×f/h)×(TTL/f)<12；
the optical lens satisfies the condition:
50≤FOV×f/h≤60；
1.5≤TTL/f≤2.5；
the focal length of the optical lens satisfies the condition: -1.5.ltoreq.f2/f.ltoreq.0, 0.1.ltoreq.f6/f.ltoreq.2, -1.5.ltoreq.f8/f.ltoreq.0;
wherein FOV is the maximum field angle of the optical lens, D is the maximum aperture of the object side of the first lens corresponding to the maximum field angle of the optical lens, h is the image height corresponding to the maximum field angle of the optical lens, BFL is the distance between the center of the image side of the eighth lens and the imaging surface of the optical lens on the optical axis, TTL is the distance between the center of the object side of the first lens and the imaging surface of the optical lens on the optical axis, f2 is the focal length of the second lens, f6 is the focal length of the sixth lens, and f8 is the focal length of the eighth lens.
2. The optical lens of claim 1, wherein: and the second lens, the third lens and the fourth lens are sequentially bonded in pairs to form a three-bonding lens.
3. The optical lens of claim 1, wherein: and the fifth lens, the sixth lens and the seventh lens are sequentially bonded in pairs to form a three-bonding lens.
4. The optical lens of claim 1, wherein: the second lens, the third lens and the fourth lens are sequentially glued in pairs to form a three-glued lens, and the fifth lens, the sixth lens and the seventh lens are sequentially glued in pairs to form a three-glued lens.
5. The optical lens of claim 1, wherein: and (c) bonding two adjacent ones of the second lens, the third lens and the fourth lens to form a double-bonded lens, and/or bonding two adjacent ones of the fifth lens, the sixth lens and the seventh lens to form a double-bonded lens.
6. The optical lens of claim 1, wherein: the image side surface of the first lens is in a convex structure, a concave structure or a plane structure, the object side surface of the second lens is in a concave structure or a plane structure, the image side surface of the fourth lens is in a convex structure or a plane structure, the object side surface of the fifth lens is in a convex structure or a plane structure, the image side surface of the seventh lens is in a convex structure, a concave structure or a plane structure, and the image side surface of the eighth lens is in a convex structure, a concave structure or a plane structure.
7. The optical lens of claim 1, wherein: the optical lens satisfies the condition: BFL is the distance between the center of the image side surface of the eighth lens and the imaging surface of the optical lens on the optical axis, wherein BFL is more than or equal to 0.05 and less than or equal to 0.2; TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis.
8. The optical lens of claim 7, wherein: BFL/TTL is more than 0.1 and less than or equal to 0.2.
9. The optical lens of claim 1, wherein: the optical lens satisfies the condition: FOV/h/D is more than or equal to 0.2 and less than or equal to 0.4, wherein FOV is the maximum view angle of the optical lens, D is the maximum aperture of the object side surface of the first lens corresponding to the maximum view angle of the optical lens, and h is the image height corresponding to the maximum view angle of the optical lens.
10. The optical lens of claim 1, wherein: TTL/f is less than or equal to 1.5 and less than or equal to 2.0.
11. The optical lens of claim 1, wherein: the refractive index of the third lens is smaller than 1.6, the Abbe constant is larger than 65, and the temperature coefficient of the refractive index of the third lens is smaller than-6 x 10 -6 Glass material at/deg.c.
12. Steering tool, characterized in that it comprises an optical lens according to any one of claims 1 to 11, said steering tool being a vehicle, a ship, an aircraft or an unmanned aerial vehicle.
CN202310725334.4A 2023-06-19 2023-06-19 Optical lens and driving tool with same Active CN116466475B (en)

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