CN116577908A - Optical lens - Google Patents
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- CN116577908A CN116577908A CN202310619049.4A CN202310619049A CN116577908A CN 116577908 A CN116577908 A CN 116577908A CN 202310619049 A CN202310619049 A CN 202310619049A CN 116577908 A CN116577908 A CN 116577908A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The application discloses an optical lens, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens having negative optical power; the object side surface of the second lens is a convex surface or a concave surface, and the image side surface of the second lens is a convex surface or a concave surface; a third lens having optical power; a fourth lens having optical power; a fifth lens having positive optical power; and a sixth lens element with negative refractive power having a concave object-side surface and a convex or concave image-side surface. When the object side surface of the second lens is a concave surface and the image side surface is a convex surface, the image side surface of the sixth lens is a convex surface; alternatively, when the object side surface of the second lens element is convex and the image side surface of the sixth lens element is concave. The optical lens satisfies: (R61+R62). Times.F6/(R61-R62). Times.20 mm.
Description
Technical Field
The application relates to the field of optical elements, in particular to an optical lens.
Background
With the continuous upgrading development of internet technology, the video camera system is widely applied to the fields of video conferences, online teaching, network video shooting and the like, and provides convenience for more and more consumers. At the same time, consumers are placing increasing demands on the performance of optical lenses mounted on video camera systems.
At present, most optical lenses in the market have difficulty in well correcting imaging aberration, and therefore poor imaging quality is easily caused. In addition, most optical lenses have larger total length and larger volume, so that the overall cost and weight of the lens are higher. Most optical lenses often have the problem of poor lens distortion management and control under the condition of realizing a large field angle, so that photographed pictures are obviously deformed, and the processing of later-stage images is affected.
Therefore, how to reasonably set the number of lens sheets, the lens power, the lens surface, and the key technical parameters in the optical lens so that the optical lens can solve at least part of the defects in the prior art has become one of the difficulties to be solved by many lens designers at present.
Disclosure of Invention
An aspect of the present application provides an optical lens sequentially including, from an object side to an image side along an optical axis: a first lens having negative optical power; the object side surface of the second lens is a convex surface or a concave surface, and the image side surface of the second lens is a convex surface or a concave surface; a third lens having optical power; a fourth lens having optical power; a fifth lens having positive optical power; and a sixth lens element with negative refractive power having a concave object-side surface and a convex or concave image-side surface. When the object side surface of the second lens is a concave surface and the image side surface is a convex surface, the image side surface of the sixth lens is a convex surface; alternatively, when the object side surface of the second lens element is convex and the image side surface of the sixth lens element is concave. The optical lens can satisfy: (R61+R62). Times.F6/(R61-R62). Times.20 mm, F6 is the effective focal length of the sixth lens, R61 is the radius of curvature of the object-side surface of the sixth lens, and R62 is the radius of curvature of the image-side surface of the sixth lens.
In one embodiment, the optical lens may satisfy: -0.48 +.R11/F1 +.0.23, where R11 is the radius of curvature of the object side of the first lens and F1 is the effective focal length of the first lens.
In one embodiment, the optical lens may satisfy: 3.09.ltoreq.R11+R12)/(R11-R12). Ltoreq.3.81, wherein R11 is the radius of curvature of the object side of the first lens and R12 is the radius of curvature of the image side of the first lens.
In one embodiment, the optical lens may satisfy: 2.20 < F23/(d2+d3) < 9.00, where F23 is the combined effective focal length of the second lens and the third lens, d2 is the center thickness of the second lens on the optical axis, and d3 is the center thickness of the third lens on the optical axis.
In one embodiment, the optical lens may satisfy: -1.49 +.ltoreq.R31+R32)/R22 +.0.45, where R22 is the radius of curvature of the image side of the second lens, R31 is the radius of curvature of the object side of the third lens, and R32 is the radius of curvature of the image side of the third lens.
In one embodiment, the optical lens may satisfy: 2.65.ltoreq.YF 4/(R41+R42) |.ltoreq.5.39, where F4 is the effective focal length of the fourth lens, R41 is the radius of curvature of the object side of the fourth lens, and R42 is the radius of curvature of the image side of the fourth lens.
In one embodiment, the optical lens may satisfy: -6.93mm -1 ≤(Vd3+Vd4)/(F3+F4)≤-2.76mm -1 Where Vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens.
In one embodiment, the optical lens may satisfy: 0.37mm < (R51+R52) ×F5/(R51-R52) < 2.27mm, where F5 is the effective focal length of the fifth lens, R51 is the radius of curvature of the object side of the fifth lens, and R52 is the radius of curvature of the image side of the fifth lens.
In one embodiment, the optical lens may satisfy: CT12/CT45 is 0.40.ltoreq.3.04, wherein CT12 is the air space of the first lens and the second lens on the optical axis, and CT45 is the air space of the fourth lens and the fifth lens on the optical axis.
In one embodiment, the optical lens may satisfy: -11.52 +.F2/F+. 2.49, where F2 is the effective focal length of the second lens and F is the total effective focal length of the optical lens.
In one embodiment, the optical lens may satisfy: F5/F is more than or equal to 0.72 and less than or equal to 1.00, wherein F5 is the effective focal length of the fifth lens, and F is the total effective focal length of the optical lens.
In one embodiment, the optical lens may satisfy: -1.50 +.F6/F +.0.97, where F6 is the effective focal length of the sixth lens and F is the total effective focal length of the optical lens.
In one embodiment, the optical lens may satisfy: 2.97.ltoreq.TTL/F.ltoreq.3.05, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens, and F is the total effective focal length of the optical lens.
In one embodiment, the optical lens may satisfy: BFL is the distance between the image side surface of the sixth lens and the imaging surface of the optical lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis.
In one embodiment, the optical lens may satisfy: and the CTmax/CTmin is less than or equal to 2.42 and less than or equal to 4.03, wherein the center thickness of the lens with the largest center thickness in the first lens to the sixth lens of the CTmax is on the optical axis, and the center thickness of the lens with the smallest center thickness in the first lens to the sixth lens of the CTmin is on the optical axis.
In one embodiment, the object side surface of the first lens is convex, and the image side surface is concave; the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface; and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface.
In the exemplary embodiment of the application, the optical lens provided by the application has at least one of the advantages of high resolution, miniaturization, low cost, low distortion and the like by reasonably setting the focal power, the surface shape, the main technical parameters and the like of each lens.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural view of an optical lens according to embodiment 1 of the present application;
fig. 2 shows a distortion curve of the optical lens of embodiment 1 of the present application;
fig. 3 is a schematic structural view of an optical lens according to embodiment 2 of the present application;
fig. 4 shows a distortion curve of the optical lens of embodiment 2 of the present application;
fig. 5 is a schematic structural view of an optical lens according to embodiment 3 of the present application;
fig. 6 shows a distortion curve of an optical lens of embodiment 3 of the present application;
fig. 7 is a schematic structural view of an optical lens according to embodiment 4 of the present application; and
fig. 8 shows a distortion curve of the optical lens of embodiment 4 of the present application.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The optical lens according to the exemplary embodiment of the present application may include six lenses having optical power, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, respectively. The six lenses are arranged in order from the object side to the image side along the optical axis.
In an exemplary embodiment, the first lens may have negative optical power. The object-side surface of the first lens element may be convex, and the image-side surface thereof may be concave. The focal power and the surface shape of the first lens can effectively control the head caliber of the optical lens, is favorable for realizing the design of miniaturization of the lens, and can converge incident light rays with a large viewing angle into the optical lens as much as possible so as to enlarge the viewing angle of the optical lens.
In an exemplary embodiment, the second lens may have negative optical power. The object-side surface of the second lens element may be convex or concave, and the image-side surface of the second lens element may be convex or concave. Illustratively, the object-side surface of the second lens is concave, and the image-side surface is convex; or the object side surface of the second lens is a convex surface, and the image side surface is a concave surface.
In an exemplary embodiment, the third lens may have positive or negative optical power. The object-side surface of the third lens element may be convex or concave, and the image-side surface thereof may be convex. The focal power and the surface shape of the third lens are favorable for enabling light rays to be smoothly transmitted, effectively correcting spherical aberration and field curvature of the optical lens, and greatly improving imaging performance of the optical lens.
In an exemplary embodiment, the fourth lens may have positive or negative optical power. The fourth lens element may have a convex object-side surface and a convex image-side surface. Illustratively, the fourth lens and the third lens may have optical powers with different positive and negative properties. According to the application, the fourth lens and the third lens are reasonably matched with different positive and negative optical power, so that the trend of light rays can be effectively controlled, the light rays can be smoothly transmitted, the spherical aberration and the coma aberration of the optical lens can be effectively corrected, and the imaging performance of the optical lens is greatly improved.
In an exemplary embodiment, the fifth lens may have positive optical power. The object side surface of the fifth lens element may be convex, and the image side surface of the fifth lens element may be convex. Such power and surface type arrangement of the fifth lens is advantageous in suppressing generation of astigmatism while being advantageous in correcting spherical aberration and marginal aberration, thereby being advantageous in improving imaging quality of the optical lens.
In an exemplary embodiment, the sixth lens may have negative optical power. The object-side surface of the sixth lens element may be concave, and the image-side surface thereof may be convex or concave. Illustratively, the object-side surface of the sixth lens element is concave and the image-side surface is convex; or the object side surface of the sixth lens is a concave surface, and the image side surface is a concave surface. The focal power and the surface shape of the sixth lens are favorable for enabling light to be smoothly transited from the sixth lens to an imaging surface, effectively inhibiting the formation of astigmatism, balancing various aberrations of the optical lens, simultaneously effectively correcting the optical distortion of an off-axis visual field, reducing the deformation degree of an image and greatly improving the imaging performance of the optical lens.
In an exemplary embodiment of the application, the object-side surface of the second lens element is concave, the image-side surface of the second lens element is convex, and the object-side surface of the sixth lens element is concave, and the image-side surface of the sixth lens element is convex. The concave-convex type second lens is matched with the concave-convex type sixth lens, so that the incident ray trend of the optical lens can be effectively controlled, various aberrations of the optical lens can be well balanced, meanwhile, the optical distortion of the optical lens can be effectively corrected, the absolute value of the optical distortion is smaller than or equal to 2.05%, the deformation degree of an image is reduced, and the imaging quality of the optical lens is improved.
In another exemplary embodiment of the present application, the object-side surface of the second lens element is convex, the image-side surface of the second lens element is concave, and the object-side surface of the sixth lens element is concave. The second lens with the convex-concave surface is matched with the sixth lens with the concave-concave surface, so that the incident light trend of the optical lens can be effectively controlled, the spherical aberration and the field curvature of the optical lens can be well balanced, meanwhile, the optical distortion of the optical lens can be effectively corrected, the absolute value of the optical distortion is less than or equal to 2.05%, the deformation degree of an image is reduced, and the imaging quality of the optical lens is improved.
In an exemplary embodiment, the optical lens according to the present application may satisfy: (R61+R62). Times.F6/(R61-R62). Times.20 mm, F6 is the effective focal length of the sixth lens, R61 is the radius of curvature of the object-side surface of the sixth lens, and R62 is the radius of curvature of the image-side surface of the sixth lens. The method satisfies the requirements of (R61+R62) x F6/(R61-R62) being less than or equal to 20mm, can effectively control the trend of light by reasonably configuring the relationship among the curvature radius of the object side surface of the sixth lens, the curvature radius of the image side surface of the sixth lens and the effective focal length of the sixth lens, so that the light smoothly transits from the sixth lens to the imaging surface, reduces the tolerance sensitivity of the sixth lens, improves the assembly yield of the lens, can effectively correct the optical distortion of the optical lens by controlling the shape of the sixth lens, enables the absolute value of the optical distortion to be less than or equal to 2.05%, reduces the deformation degree of an image, reduces the reality of an object and realizes low distortion.
In an exemplary embodiment, the optical lens according to the present application may satisfy: -0.48 +.R11/F1 +.0.23, where R11 is the radius of curvature of the object side of the first lens and F1 is the effective focal length of the first lens. Satisfies R11/F1 less than or equal to-0.48 less than or equal to-0.23, and can lead the light rays with large angles to be converged into the optical lens by reasonably configuring the ratio of the curvature radius of the object side surface of the first lens to the effective focal length of the first lens, thereby effectively expanding the angle of view of the optical lens.
In an exemplary embodiment, the optical lens according to the present application may satisfy: 3.09.ltoreq.R11+R12)/(R11-R12). Ltoreq.3.81, wherein R11 is the radius of curvature of the object side of the first lens and R12 is the radius of curvature of the image side of the first lens. The ratio of (R11+R12)/(R11-R12) is less than or equal to 3.09 and less than or equal to 3.81, and more incident light rays can be converged by the first lens through reasonably controlling the curvature radiuses of the object side surface and the image side surface of the first lens, so that the imaging brightness of the optical lens is improved.
In an exemplary embodiment, the optical lens according to the present application may satisfy: 2.20 < F23/(d2+d3) < 9.00, where F23 is the combined effective focal length of the second lens and the third lens, d2 is the center thickness of the second lens on the optical axis, and d3 is the center thickness of the third lens on the optical axis. Satisfies 2.20 & lt|F23/(d2+d3) | & lt 9.00, and can enable light to be smoothly transmitted by reasonably configuring the ratio relation between the combined effective focal length of the second lens and the third lens and the central thicknesses of the second lens and the third lens, so that spherical aberration and field curvature of the optical lens are effectively corrected, and imaging performance of the optical lens is greatly improved.
In an exemplary embodiment, the optical lens according to the present application may satisfy: -1.49 +.ltoreq.R31+R32)/R22 +.0.45, where R22 is the radius of curvature of the image side of the second lens, R31 is the radius of curvature of the object side of the third lens, and R32 is the radius of curvature of the image side of the third lens. Satisfies-1.49 (R31+R32)/R22 is less than or equal to-0.45, and can effectively ensure the maximum light flux and improve the illumination of the optical lens by reasonably regulating the curvature radius of the image side surface of the second lens, the curvature radius of the object side surface of the third lens and the curvature radius of the image side surface of the third lens.
In an exemplary embodiment, the optical lens according to the present application may satisfy: 2.65.ltoreq.YF 4/(R41+R42) |.ltoreq.5.39, where F4 is the effective focal length of the fourth lens, R41 is the radius of curvature of the object side of the fourth lens, and R42 is the radius of curvature of the image side of the fourth lens. Satisfies 2.65 < F4/(r41+r42) < 5.39), and can effectively control the trend of light rays by reasonably configuring the effective focal length of the fourth lens and the curvature radius of the object side surface and the image side surface of the fourth lens, so that the light rays can be smoothly transmitted, the spherical aberration and the coma aberration of the optical lens can be effectively corrected, and the imaging performance of the optical lens is greatly improved.
In an exemplary embodiment, the optical lens according to the present application may satisfy: -6.93mm -1 ≤(Vd3+Vd4)/(F3+F4)≤-2.76mm -1 Where Vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens. Meets-6.93 mm -1 ≤(Vd3+Vd4)/(F3+F4)≤-2.76mm -1 The chromatic aberration of the lens can be effectively corrected by reasonably matching the focal power and the Abbe number of the third lens and the fourth lens, and the saturation of the color of the lens is improved.
In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.37mm < (R51+R52) ×F5/(R51-R52) < 2.27mm, where F5 is the effective focal length of the fifth lens, R51 is the radius of curvature of the object side of the fifth lens, and R52 is the radius of curvature of the image side of the fifth lens. Satisfies 0.37mm < R51+ R52 >. Times.F5/(R51-R52) < 2.27mm, and can effectively control the trend of light by reasonably configuring the relationship among the curvature radius of the object side surface of the fifth lens, the curvature radius of the image side surface of the fifth lens and the effective focal length of the fifth lens, slow down the deflection angle of the incident light ray and the emergent light ray of the fifth lens, lead the light ray to smoothly enter the rear of the optical lens, reduce the tolerance sensitivity of the lens and improve the yield of the lens.
In an exemplary embodiment, the optical lens according to the present application may satisfy: CT12/CT45 is 0.40.ltoreq.3.04, wherein CT12 is the air space of the first lens and the second lens on the optical axis, and CT45 is the air space of the fourth lens and the fifth lens on the optical axis. In the application, under the condition of meeting the imaging quality requirement of the lens, CT12/CT45 is more than or equal to 0.40 and less than or equal to 3.04, and the air interval between the adjacent two lenses can be as small as possible by reasonably controlling the air interval between the first lens and the second lens on the optical axis and the air interval between the fourth lens and the fifth lens on the optical axis, thereby being beneficial to realizing the design of miniaturization of the lens.
In an exemplary embodiment, the optical lens according to the present application may satisfy: -11.52 +.F2/F+. 2.49, where F2 is the effective focal length of the second lens and F is the total effective focal length of the optical lens. More specifically, F2 and F further satisfy: -7.5.ltoreq.F2/F.ltoreq.2.49. Satisfies-11.52 < F2/F < 2.49, can make more light smoothly enter into the optical lens by reasonably configuring the relation between the effective focal length of the second lens and the total effective focal length of the lens, controls the light trend, is beneficial to correcting various aberrations and improving the imaging quality of the lens, and can effectively regulate and control the optical distortion of the marginal view field of the optical lens so as to be beneficial to controlling the distortion amount of the marginal view field within a reasonable range.
In an exemplary embodiment, the optical lens according to the present application may satisfy: F5/F is more than or equal to 0.72 and less than or equal to 1.00, wherein F5 is the effective focal length of the fifth lens, and F is the total effective focal length of the optical lens. Satisfies that F5/F is less than or equal to 0.72 and less than or equal to 1.00, can inhibit the generation of astigmatism by reasonably regulating and controlling the relation between the effective focal length of the fifth lens and the total effective focal length of the lens, and is beneficial to correcting spherical aberration and marginal aberration, thereby being beneficial to improving the imaging quality of the optical lens.
In an exemplary embodiment, the optical lens according to the present application may satisfy: -1.50 +.F6/F +.0.97, where F6 is the effective focal length of the sixth lens and F is the total effective focal length of the optical lens. The optical distortion of the field of view outside the axis can be effectively corrected by reasonably configuring the relation between the effective focal length of the sixth lens and the total effective focal length of the lens, so that the absolute value of the optical distortion is less than or equal to 2.05%, the deformation degree of the image is greatly reduced, various aberrations such as spherical aberration, coma and the like can be effectively corrected, and the imaging performance of the lens is improved.
In an exemplary embodiment, the optical lens according to the present application may satisfy: 2.97.ltoreq.TTL/F.ltoreq.3.05, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens, and F is the total effective focal length of the optical lens. The optical lens has the advantages that the TTL/F is less than or equal to 2.97 and less than or equal to 3.05, and the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis is controlled within a reasonable range under the condition that the optical lens has a certain total effective focal length, so that the optical lens has a smaller total length, and the miniaturization of the lens is facilitated. For example, the distance TTL between the object side surface of the first lens element and the imaging surface of the optical lens element on the optical axis may be as follows: TTL < 23mm.
In an exemplary embodiment, the optical lens according to the present application may satisfy: BFL is the distance between the image side surface of the sixth lens and the imaging surface of the optical lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis. The BFL/TTL is less than or equal to 0.27 and less than or equal to 0.30, and the distance BFL from the image side surface of the sixth lens to the imaging surface of the optical lens on the optical axis can be reasonably controlled under the condition that the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis is ensured to be constant, so that the assembly yield of the optical lens can be effectively improved, and a certain space can be reserved for the installation of other elements in the optical lens, so that the design elasticity of the optical lens is increased.
In an exemplary embodiment, the optical lens according to the present application may satisfy: and the CTmax/CTmin is less than or equal to 2.42 and less than or equal to 4.03, wherein the center thickness of the lens with the largest center thickness in the first lens to the sixth lens of the CTmax is on the optical axis, and the center thickness of the lens with the smallest center thickness in the first lens to the sixth lens of the CTmin is on the optical axis. More specifically, CTmax and CTmin may further satisfy: CTmax/CTmin is not less than 3 and not more than 4.03. The lens meets the requirement that CTmax/CTmin is less than or equal to 2.42 and less than or equal to 4.03, and the thickness of each lens in the optical lens can be reasonably controlled to ensure that the effect of each lens is stable, thereby being beneficial to ensuring that the change of the light trend of the lens in a high-low temperature environment is small and ensuring that the lens is athermalized.
In an exemplary embodiment, the optical lens according to the present application may further include a diaphragm, which may be located between the second lens and the third lens; or between the third lens and the fourth lens. According to the application, the diaphragm is arranged between the second lens and the third lens or between the third lens and the fourth lens, so that light entering the optical lens can be effectively converged, the total length of the optical lens is shortened, the maximum aperture of the optical lens is reduced, and the miniaturized design of the optical lens is facilitated.
In an exemplary embodiment, the second, fifth and sixth lenses may be plastic lenses. The first, third and fourth lenses may be glass lenses or plastic lenses. The application is beneficial to reducing the cost by adopting the mixing and collocation of the glass lens and the plastic lens, and simultaneously is beneficial to ensuring that the lens can work normally under high and low temperature environments, and realizing that the lens has higher imaging quality in the temperature range of 20 ℃ below zero to 60 ℃.
In an exemplary embodiment, the optical lens according to the present application may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging plane. The application provides an optical lens with the characteristics of high resolution, miniaturization, low cost, low distortion, small volume, good temperature performance, high imaging quality and the like. The optical lens according to the above embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like of each lens, incident light rays can be effectively converged, the optical total length of the imaging lens is reduced, and the processability of the imaging lens is improved, so that the optical lens is more beneficial to production and processing.
In an exemplary embodiment, at least one mirror surface of the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of the object side surface and the image side surface of at least four lenses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is an aspherical mirror surface. Optionally, the object side and the image side of at least four lenses are aspherical mirrors. The application is favorable for correcting lens distortion by arranging the plurality of lenses as the aspheric lenses, so that the absolute value of optical distortion of the lens is less than or equal to 2.05 percent.
However, those skilled in the art will appreciate that the number of lenses making up an optical lens can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although six lenses are described as an example in the embodiment, the optical lens is not limited to including six lenses. The optical lens may also include other numbers of lenses, if desired.
Specific examples of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical lens according to embodiment 1 of the present application is described below with reference to fig. 1 and 2. Fig. 1 is a schematic structural view of an optical lens according to embodiment 1 of the present application.
As shown in fig. 1, the optical lens sequentially includes, from an object side to an image side: a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter and/or a cover glass CG and an imaging plane.
The first lens element L1 has a negative refractive power, and an object-side surface thereof is convex and an image-side surface thereof is concave. The second lens element L2 has negative refractive power, and has a concave object-side surface and a convex image-side surface. The third lens element L3 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The fourth lens element L4 has negative refractive power, and has a convex object-side surface and a concave image-side surface. The fifth lens element L5 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The sixth lens element L6 has negative refractive power, and has a concave object-side surface and a convex image-side surface. Light from the object sequentially passes through the surfaces (i.e. sequentially passes through the object side of the first lens L1 to the image side of the filter and/or the cover glass CG) and is finally imaged on an imaging plane, where an image sensing chip IMA may be arranged.
Table 1 shows the basic parameter table of the optical lens of example 1, in which the unit of curvature radius and thickness/distance is millimeter (mm).
TABLE 1
In this example, the surface 11 is the object side of the first lens and the surface 12 is the image side of the first lens. The surface 21 is the object side of the second lens and the surface 22 is the image side of the second lens. The surface 31 is the object side of the third lens element and the surface 32 is the image side of the third lens element. The surface 41 is the object side of the fourth lens element and the surface 42 is the image side of the fourth lens element. The surface 51 is the object side of the fifth lens element, and the surface 52 is the image side of the fifth lens element. The surface 61 is the object side of the sixth lens and the surface 62 is the image side of the sixth lens. Surface 71 is the object side of the filter and surface 72 is the image side of the filter.
In this example, the stop STO may be located between the second lens L2 and the third lens L3. The aperture value FNO of the optical lens was 2.20, and the absolute value of the optical distortion of the optical lens was 1.88%.
In embodiment 1, the object side surface and the image side surface of any one of the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are aspherical, and the surface type z of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the quadric constant of the aspheric surface; a is that 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 Aspheric coefficients of four, six, eight, ten, fourteen, sixteen orders, respectively, of the aspheric surface. The quadric constants k and higher order coefficients A that can be used for each of the aspherical mirror surfaces 11-22, 41-62 in example 1 are given in Table 2 below 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 。
TABLE 2
Fig. 2 shows distortion curves of the optical lens of embodiment 1, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 2, the optical lens provided in embodiment 1 can achieve good imaging quality.
Example 2
An optical lens according to embodiment 2 of the present application is described below with reference to fig. 3 and 4. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic structural view of an optical lens according to embodiment 2 of the present application.
As shown in fig. 3, the optical lens sequentially includes, from an object side to an image side: a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter and/or a cover glass CG and an imaging plane.
The first lens element L1 has a negative refractive power, and an object-side surface thereof is convex and an image-side surface thereof is concave. The second lens element L2 has negative refractive power, and has a concave object-side surface and a convex image-side surface. The third lens element L3 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The fourth lens element L4 has negative refractive power, and has a convex object-side surface and a concave image-side surface. The fifth lens element L5 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The sixth lens element L6 has negative refractive power, and has a concave object-side surface and a convex image-side surface. Light from the object sequentially passes through the surfaces (i.e. sequentially passes through the object side of the first lens L1 to the image side of the filter and/or the cover glass CG) and is finally imaged on an imaging plane, where an image sensing chip IMA may be arranged.
In this example, the stop STO may be located between the second lens L2 and the third lens L3. The aperture value FNO of the optical lens was 2.20, and the absolute value of the optical distortion of the optical lens was 2.04%.
Table 3 shows the basic parameter table of the optical lens of example 2, in which the unit of curvature radius and thickness/distance is millimeter (mm). Table 4 shows the quadric constant k and higher order coefficient A that can be used for each of the aspherical mirrors in example 2 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 3 Table 3
| Face number | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| Surface 11 | -0.15 | 3.85E-04 | -5.21E-05 | 9.42E-06 | -1.78E-06 | 1.62E-07 | -8.18E-09 | 1.63E-10 |
| Surface 12 | -0.65 | 3.84E-03 | -6.42E-05 | 9.24E-05 | -2.71E-05 | 3.75E-06 | -2.46E-07 | -5.24E-09 |
| Surface 21 | -0.28 | 2.49E-03 | 2.66E-05 | 1.05E-04 | -8.02E-05 | 2.52E-05 | -4.11E-06 | 2.58E-07 |
| Surface 22 | -0.12 | 1.38E-03 | 1.77E-04 | 3.22E-05 | -2.40E-05 | 6.24E-06 | -8.25E-07 | 4.38E-08 |
| Surface 41 | -0.70 | -6.32E-03 | 1.11E-03 | -7.71E-05 | -2.00E-06 | 9.39E-07 | -9.99E-08 | 4.94E-09 |
| Surface 42 | -0.30 | -1.34E-02 | 2.37E-03 | -2.63E-04 | 2.15E-05 | -1.56E-06 | 9.48E-08 | -3.80E-09 |
| Surface 51 | -2.17 | -2.68E-03 | 4.98E-04 | -1.39E-05 | -2.21E-06 | 2.35E-07 | 1.90E-08 | -2.55E-09 |
| Surface 52 | 0.60 | 3.04E-03 | -4.29E-04 | 5.63E-05 | -2.15E-06 | 3.32E-07 | 1.90E-09 | -2.54E-09 |
| Surface 61 | 0.72 | 1.00E-02 | -1.71E-03 | 2.03E-04 | -1.39E-05 | 1.01E-06 | 3.43E-09 | -5.07E-09 |
| Surface 62 | 49.44 | 8.43E-03 | -1.05E-03 | 1.26E-04 | -9.82E-06 | 7.90E-07 | -6.56E-08 | 4.91E-09 |
TABLE 4 Table 4
Fig. 4 shows distortion curves of the optical lens of embodiment 2, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 4, the optical lens provided in embodiment 2 can achieve good imaging quality.
Example 3
An optical lens according to embodiment 3 of the present application is described below with reference to fig. 5 and 6. Fig. 5 is a schematic structural view of an optical lens according to embodiment 3 of the present application.
As shown in fig. 5, the optical lens sequentially includes, from an object side to an image side: a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter and/or a cover glass CG and an imaging plane.
The first lens element L1 has a negative refractive power, and an object-side surface thereof is convex and an image-side surface thereof is concave. The second lens element L2 has negative refractive power, and has a convex object-side surface and a concave image-side surface. The third lens element L3 has negative refractive power, and has a concave object-side surface and a convex image-side surface. The fourth lens element L4 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The fifth lens element L5 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The sixth lens element L6 has a negative refractive power, and has a concave object-side surface and a concave image-side surface. Light from the object sequentially passes through the surfaces (i.e. sequentially passes through the object side of the first lens L1 to the image side of the filter and/or the cover glass CG) and is finally imaged on an imaging plane, where an image sensing chip IMA may be arranged.
In this example, the stop STO may be located between the third lens L3 and the fourth lens L4. The aperture value FNO of the optical lens was 2.20, and the absolute value of the optical distortion of the optical lens was 2.02%.
Table 5 shows the basic parameter table of the optical lens of example 3, in which the unit of the radius of curvature and the thickness/distance is millimeter (mm). Table 6 shows the quadric constant k and higher order coefficient A for each of the aspherical mirrors in example 3 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
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TABLE 5
| Face number | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| Surface 21 | 2.49 | 1.27E-03 | 7.02E-05 | -1.17E-05 | 3.41E-06 | -4.26E-07 | 1.57E-08 | 1.90E-09 |
| Surface 22 | -7.61 | 8.15E-03 | -1.15E-04 | 1.66E-05 | -1.60E-05 | 1.25E-05 | -3.28E-06 | 2.95E-07 |
| Surface 31 | -0.86 | 8.52E-04 | 6.40E-04 | -6.04E-04 | 2.95E-04 | -8.19E-05 | 1.15E-05 | -6.28E-07 |
| Surface 32 | 0.27 | 4.10E-03 | 2.60E-04 | -5.58E-05 | 2.08E-05 | -2.78E-06 | 9.08E-08 | 8.49E-09 |
| Surface 51 | -4.93 | 1.82E-03 | -1.78E-04 | 1.15E-05 | -3.47E-06 | 5.88E-07 | -5.42E-08 | 1.88E-09 |
| Surface 52 | -6.65 | -2.11E-03 | -2.27E-04 | 9.34E-05 | -7.91E-06 | -3.11E-07 | 6.94E-08 | -2.50E-09 |
| Surface 61 | -30.59 | -4.21E-03 | 1.18E-04 | 1.08E-04 | -3.26E-06 | -2.81E-06 | 3.73E-07 | -1.44E-08 |
| Surface 62 | -31.77 | 4.17E-03 | -5.14E-04 | 2.02E-04 | -3.39E-05 | 2.94E-06 | -1.34E-07 | 2.62E-09 |
TABLE 6
Fig. 6 shows distortion curves of the optical lens of embodiment 3, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 6, the optical lens provided in embodiment 3 can achieve good imaging quality.
Example 4
An optical lens according to embodiment 4 of the present application is described below with reference to fig. 7 and 8. Fig. 7 shows a schematic structural diagram of an optical lens according to embodiment 4 of the present application.
As shown in fig. 7, the optical lens sequentially includes, from an object side to an image side: a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter and/or a cover glass CG and an imaging plane.
The first lens element L1 has a negative refractive power, and an object-side surface thereof is convex and an image-side surface thereof is concave. The second lens element L2 has negative refractive power, and has a convex object-side surface and a concave image-side surface. The third lens element L3 has negative refractive power, and has a concave object-side surface and a convex image-side surface. The fourth lens element L4 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The fifth lens element L5 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The sixth lens element L6 has a negative refractive power, and has a concave object-side surface and a concave image-side surface. Light from the object sequentially passes through the surfaces (i.e. sequentially passes through the object side of the first lens L1 to the image side of the filter and/or the cover glass CG) and is finally imaged on an imaging plane, where an image sensing chip IMA may be arranged.
In this example, the stop STO may be located between the third lens L3 and the fourth lens L4. The aperture value FNO of the optical lens was 2.20, and the absolute value of the optical distortion of the optical lens was 2.02%.
Table 7 shows the basic parameter table of the optical lens of example 4, in which the unit of the radius of curvature and the thickness/distance is millimeter (mm). Table 8 shows the quadric constant k and higher order coefficient A for each of the aspherical mirrors in example 4 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 7
TABLE 8
Fig. 8 shows distortion curves of the optical lens of embodiment 4, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 8, the optical lens provided in embodiment 4 can achieve good imaging quality.
In summary, examples 1 to 4 satisfy the relationships shown in table 9, respectively.
| Condition/example | 1 | 2 | 3 | 4 |
| R11/F1 | -0.32 | -0.27 | -0.43 | -0.44 |
| (R11+R12)/(R11-R12) | 3.50 | 3.67 | 3.22 | 3.19 |
| F2/F | -3.78 | -5.59 | -10.23 | -9.81 |
| |F23/(d2+d3)| | 2.64 | 2.32 | 7.88 | 7.82 |
| (R31+R32)/R22 | -1.34 | -0.60 | -1.10 | -1.10 |
| |F4/(R41+R42)| | 5.00 | 3.12 | 3.04 | 3.05 |
| (Vd3+Vd4)/(F3+F4)(mm -1 ) | -3.36 | -6.33 | -5.78 | -5.85 |
| F5/F | 0.77 | 0.77 | 0.97 | 0.97 |
| F6/F | -1.26 | -1.42 | -1.05 | -1.05 |
| (R51+R52)×F5/(R51-R52)(mm) | 0.94 | 0.64 | 2.00 | 2.00 |
| |(R61+R62)×F6/(R61-R62)|(mm) | 17.60 | 17.44 | 0.25 | 0.05 |
| TTL/F | 2.99 | 3.02 | 3.03 | 3.03 |
| CT12/CT45 | 2.79 | 2.65 | 0.41 | 0.49 |
| BFL/TTL | 0.29 | 0.28 | 0.29 | 0.29 |
| CTmax/Ctmin | 3.80 | 2.65 | 3.43 | 3.48 |
TABLE 9
The application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging device of a video camera system or may be an imaging module integrated on a mobile electronic device such as a video camera system. The image pickup system is equipped with the optical lens described above.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (10)
1. The optical lens assembly includes, in order from an object side to an image side along an optical axis:
a first lens having negative optical power;
the object side surface of the second lens is a convex surface or a concave surface, and the image side surface of the second lens is a convex surface or a concave surface;
a third lens having optical power;
a fourth lens having optical power;
a fifth lens having positive optical power; and
a sixth lens element with negative refractive power having a concave object-side surface and a convex or concave image-side surface;
when the object side surface of the second lens is a concave surface and the image side surface is a convex surface, the image side surface of the sixth lens is a convex surface; or when the object side surface of the second lens is a convex surface and the image side surface is a concave surface, the image side surface of the sixth lens is a concave surface; and
the optical lens satisfies the following conditions: (R61+R62) ×F6/(R61-R62) |20mm, wherein F6 is the effective focal length of the sixth lens, R61 is the radius of curvature of the object side of the sixth lens, and R62 is the radius of curvature of the image side of the sixth lens.
2. The optical lens of claim 1, wherein the optical lens satisfies: -0.48 +.R11/F1 +.0.23, where R11 is the radius of curvature of the object side of the first lens and F1 is the effective focal length of the first lens.
3. The optical lens of claim 1, wherein the optical lens satisfies: 3.09 < 11+R12)/(R11-R12) < 3.81, wherein R11 is the radius of curvature of the object side of the first lens and R12 is the radius of curvature of the image side of the first lens.
4. The optical lens of claim 1, wherein the optical lens satisfies: 2.20 < F23/(d2+d3) < 9.00, where F23 is the combined effective focal length of the second lens and the third lens, d2 is the center thickness of the second lens on the optical axis, and d3 is the center thickness of the third lens on the optical axis.
5. The optical lens of claim 1, wherein the optical lens satisfies: -1.49 +.ltoreq.R31+R32)/R22 +.0.45, where R22 is the radius of curvature of the image side of the second lens, R31 is the radius of curvature of the object side of the third lens, and R32 is the radius of curvature of the image side of the third lens.
6. The optical lens of claim 1, wherein the optical lens satisfies: 2.65 < F4/(r41+r42) < 5.39, where F4 is the effective focal length of the fourth lens, R41 is the radius of curvature of the object-side surface of the fourth lens, and R42 is the radius of curvature of the image-side surface of the fourth lens.
7. The optical lens of claim 1, wherein the optical lens satisfies: -6.93mm -1 ≤(Vd3+Vd4)/(F3+F4)≤-2.76mm -1 Where Vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens.
8. The optical lens of claim 1, wherein the optical lens satisfies: 0.37mm < (R51+R52) ×F5/(R51-R52) < 2.27mm, wherein F5 is the effective focal length of the fifth lens, R51 is the radius of curvature of the object side of the fifth lens, and R52 is the radius of curvature of the image side of the fifth lens.
9. The optical lens of claim 1, wherein the optical lens satisfies: CT12/CT45 is 0.40-3.04, wherein CT12 is the air space of the first lens and the second lens on the optical axis, and CT45 is the air space of the fourth lens and the fifth lens on the optical axis.
10. The optical lens of claim 1, wherein the optical lens satisfies: -11.52 +.F2/F+. 2.49, where F2 is the effective focal length of the second lens and F is the total effective focal length of the optical lens.
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