CN117492179A - Imaging lens - Google Patents
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- CN117492179A CN117492179A CN202311756163.8A CN202311756163A CN117492179A CN 117492179 A CN117492179 A CN 117492179A CN 202311756163 A CN202311756163 A CN 202311756163A CN 117492179 A CN117492179 A CN 117492179A
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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
- G02B13/0055—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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Abstract
The embodiment of the application discloses an imaging lens, includes in order from object side to image side along the optical axis: a first lens having negative optical power; a second lens group including at least one lens; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens having negative optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; an eighth lens having negative optical power; a ninth lens having positive optical power; a tenth lens having negative optical power; and an eleventh lens having positive optical power.
Description
Technical Field
The present application relates to the field of optical elements, and in particular, to an imaging lens.
Background
Along with the development of modern economic construction and management, the requirement of road monitoring is increasingly emphasized, and more requirements are also put forward for matched lenses.
The intelligent traffic lens on the market today has the following disadvantages:
1. the lens distortion is large, so that the reduction degree of an imaging picture is unreal;
2. the lens aperture is smaller, so that the uniformity of the picture is not high;
3. the problem that the object distance of the lens is narrow is caused, so that the lens does not meet the use scene;
4. the existing lens has the problem of shorter back focus, so that the lens is not suitable for various interfaces;
5. the existing lens CRA (China Ray Angle) is large and cannot be matched with various chips;
in summary, the current intelligent traffic lens has larger distortion, smaller aperture, narrower object distance range, short back focus, unsatisfied scene use, larger CRA and difficulty in coping with future market development trend.
Disclosure of Invention
According to an embodiment of the present application, there is provided an imaging lens including, in order from an object side to an image side along an optical axis: a first lens having negative optical power; a second lens group including at least one lens; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens having negative optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; an eighth lens having negative optical power; a ninth lens having positive optical power; a tenth lens having negative optical power; and an eleventh lens having positive optical power.
In some embodiments, the object-side surface of the first lens is convex and the image-side surface is concave; an object side surface of the lens closest to the object side in the second lens group is concave, and an image side surface of the lens closest to the image side is convex; the object side surface of the third lens is a convex surface; the image side surface of the fourth lens is a concave surface; the object side surface and the image side surface of the fifth lens are concave surfaces; the object side surface and the image side surface of the sixth lens are convex; the object side surface and the image side surface of the seventh lens are both convex surfaces; the object side surface of the eighth lens is a convex surface, and the image side surface is a concave surface; the object side surface and the image side surface of the ninth lens are both convex surfaces; the object side surface and the image side surface of the tenth lens are concave surfaces; and the object side surface and the image side surface of the eleventh lens are convex.
In some embodiments, the second lens group includes a second lens having negative optical power, wherein an object side surface of the second lens is concave, and an image side surface of the second lens is convex.
In some embodiments, the second lens group includes a first cemented lens and a second cemented lens, the first cemented lens and the second cemented lens comprising a cemented lens; wherein the first adhesive lens has negative focal power, and the object side surface of the first adhesive lens is a concave surface; the second cemented lens has positive optical power and its image side is convex.
In some embodiments, the radius of curvature R21 of the object side and the radius of curvature R22 of the image side of the first cemented lens, and the radius of curvature R31 of the object side and the radius of curvature R32 of the image side of the second cemented lens satisfy: -0.01.ltoreq.R 21/R22)/(R31/R32).ltoreq.0.04.
In some embodiments, the effective focal length fB21 of the first adhesive lens and the effective focal length fB22 of the second adhesive lens satisfy: -1.03.ltoreq.fB22/fB21.ltoreq.0.88.
In some embodiments, the eighth to eleventh lenses constitute a four-cemented lens, and an effective focal length fB4 of the four-cemented lens and a total effective focal length f of the imaging lens satisfy: fB4/f is more than or equal to 2.09 and less than or equal to 2.91.
In some embodiments, the total image height IH of the imaging lens, the total effective focal length f of the imaging lens, and the f-number FNO of the imaging lens satisfy: IH/f/FNO is more than or equal to 0.53 and less than or equal to 0.68.
In some embodiments, the effective focal length f1 of the first lens and the total effective focal length f of the imaging lens satisfy: -f 1/f is less than or equal to 3.46 and less than or equal to-2.43.
In some embodiments, the radius of curvature R81 of the object-side surface and the radius of curvature R82 of the image-side surface of the eighth lens, and the radius of curvature R101 of the object-side surface and the radius of curvature R102 of the image-side surface of the tenth lens satisfy: 62.34 is less than or equal to (R81+R82)/(R101+R102) and less than or equal to-2.4.
In some embodiments, the optical back Jiao Changdu BFL of the imaging lens and the optical total length TTL of the imaging lens satisfy: BFL/TTL is more than or equal to 0.27 and less than or equal to 0.29.
In some embodiments, the effective focal length f3 of the third lens and the total effective focal length f of the imaging lens satisfy: f3/f is more than or equal to 1.14 and less than or equal to 1.62.
In some embodiments, the effective focal length f4 of the fourth lens and the total effective focal length f of the imaging lens satisfy: -1.66.ltoreq.f4/f.ltoreq.1.19.
In some embodiments, the effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens satisfy: -0.85.ltoreq.f5/f.ltoreq.0.62.
In some embodiments, the effective focal length f6 of the sixth lens and the total effective focal length f of the imaging lens satisfy: f6/f is more than or equal to 0.86 and less than or equal to 1.14.
In some embodiments, the effective focal length f7 of the seventh lens and the total effective focal length f of the imaging lens satisfy: f7/f is more than or equal to 1.28 and less than or equal to 2.23.
In some embodiments, the effective focal length f8 of the eighth lens and the total effective focal length f of the imaging lens satisfy: -1.84.ltoreq.f8/f.ltoreq.1.28.
In some embodiments, the effective focal length f9 of the ninth lens and the total effective focal length f of the imaging lens satisfy: f9/f is more than or equal to 0.75 and less than or equal to 0.94.
In some embodiments, the effective focal length f10 of the tenth lens and the total effective focal length f of the imaging lens satisfy: -0.71.ltoreq.f10/f.ltoreq.0.6.
In some embodiments, the effective focal length f11 of the eleventh lens and the total effective focal length f of the imaging lens satisfy: f11/f is more than or equal to 0.76 and less than or equal to 0.83.
According to the imaging lens provided by the embodiment of the application, through the focal power distribution and the surface type design of each lens, on one hand, a large aperture can be realized, on the other hand, chromatic aberration, aberration and distortion can be well corrected, and at least one of the design requirements of low distortion, large aperture, wide object distance range, long back focal length and small CRA can be met. The imaging lens provided by the application can be applied to an intelligent traffic lens, and meets the market development requirement for road monitoring.
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 following drawings, in which:
fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application;
fig. 2 shows an optical distortion curve of an imaging lens according to embodiment 1 of the present application;
fig. 3 shows a schematic structural view of an imaging lens according to embodiment 2 of the present application;
fig. 4 shows an optical distortion curve of an imaging lens according to embodiment 2 of the present application;
fig. 5 shows a schematic structural view of an imaging lens according to embodiment 3 of the present application;
fig. 6 shows an optical distortion curve of an imaging lens according to embodiment 3 of the present application;
fig. 7 shows a schematic structural diagram of an imaging lens according to embodiment 4 of the present application;
fig. 8 shows an optical distortion curve of an imaging lens according to embodiment 4 of the present application;
fig. 9 shows a schematic structural view of an imaging lens according to embodiment 5 of the present application;
fig. 10 shows an optical distortion curve of an imaging lens according to embodiment 5 of the present application;
fig. 11 shows a schematic structural view of an imaging lens according to embodiment 6 of the present application; and
fig. 12 shows an optical distortion curve of an imaging lens according to embodiment 6 of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are 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 first 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 present application, use of "may" means "one or more embodiments of the present 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, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The following examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application.
The features, principles, and other aspects of the present application are described in detail below.
Referring to fig. 1, according to an embodiment of the present application, there is provided an imaging lens including, in order from an object side to an image side along an optical axis: the first lens L1, the second lens group B2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11.
In an exemplary embodiment, the first lens L1 may have negative optical power, and an object-side surface thereof may be convex and an image-side surface thereof may be concave. The first lens of the imaging lens is set to be negative focal power, so that the entrance pupil diameter of the imaging lens is increased, and the aperture of the imaging lens is increased, and the large aperture effect is realized.
In some exemplary embodiments, the second lens group B2 includes at least one lens, for example, the second lens L2, and the second lens L2 may have negative optical power, and an object-side surface thereof may be concave, and an image-side surface thereof may be convex.
In other exemplary embodiments, the second lens group B2 may include a first bonding lens B21 and a second bonding lens B22, and the first bonding lens B21 and the second bonding lens B22 may constitute a bonding lens, wherein the first bonding lens B21 may have negative optical power and an object side thereof may be concave; the second adhesive lens B22 may have positive optical power, and its image side surface may be convex. Through the optical power and the shape of each lens in the reasonable setting second lens group, can slow down the deflection degree of light through the second lens group, be favorable to correcting imaging lens's distortion to realize low distortion effect.
In an exemplary embodiment, the third lens L3 may have positive optical power, and an object side surface thereof may be convex; the fourth lens L4 may have negative optical power, and an image-side surface thereof may be concave; the fifth lens element L5 has negative refractive power, and has concave object-side and image-side surfaces; the sixth lens element L6 with positive refractive power has a convex object-side surface and a convex image-side surface. The third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are reasonably arranged to form a double Gaussian symmetrical structure, so that the effect of wide object distance range is achieved. In addition, the refractive index temperature coefficient material, such as that dn/dT of the refractive index temperature coefficient of the sixth lens is-3.5 to-3.1, is reasonably adopted, and the focal power and shape of the sixth lens are reasonably set, so that the athermalization effect of the lens is facilitated.
In an exemplary embodiment, the seventh lens L7 may have positive optical power, and both the object side and the image side thereof are convex. By reasonably setting the focal power and the shape of the seventh lens of the imaging lens, light is smoothly transited from the object side surface of the seventh lens to the image side surface of the seventh lens, and small coma is generated, so that a high-resolution effect is realized.
In an exemplary embodiment, the eighth lens L8 may have negative optical power, with a convex object-side surface and a concave image-side surface. The focal power and the shape of the eighth lens are reasonably arranged, so that the light is lifted, the image surface and the back focal length of the imaging lens are increased, and the large target surface and the long back focal effect are realized.
In an exemplary embodiment, the ninth lens L9 may have positive optical power, and both its object side and image side surfaces are convex. The materials with the refractive index temperature coefficients, such as that dn/dT of the refractive index temperature coefficients of-7.7 to-7.0 of the ninth lens, are reasonably adopted, and the focal power and the shape of the ninth lens are reasonably set, so that the athermalization effect of the lens is realized.
In an exemplary embodiment, the tenth lens L10 has negative optical power, and both its object-side and image-side surfaces are concave. The focal power and the shape of the tenth lens are reasonably set, so that the light is lifted, the image surface and the back focal length of the imaging lens are increased, and the large target surface and the long back focal effect are realized.
In an exemplary embodiment, the eleventh lens L11 has positive power, and both the object side surface and the image side surface thereof are convex. The image side surface shape of the eleventh lens of the imaging lens is reasonably arranged, and matched with the object side surface shape of the third lens, so that spherical aberration generated by other lenses is compensated together, and the high-resolution effect is realized.
In an exemplary embodiment, the cemented lens in the second lens group B2 satisfies: -0.01 +.ltoreq.R 21/R22)/(R31/R32) +.0.04, where R21 and R22 are the radii of curvature of the object side and the image side of the first cemented lens B21, respectively, and R31 and R32 are the radii of curvature of the object side and the image side of the second cemented lens B22, respectively. By reasonably controlling the curvature radiuses of the first and second gluing lenses B21 and B22, light is smoothly transited from the object side surface of the first gluing lens B21 to the image side surface of the second gluing lens B22, so that the distortion of the imaging lens is corrected, and a low distortion effect is realized.
In an exemplary embodiment, the cemented lens in the second lens group B2 satisfies: -1.03.ltoreq.fB22/fB21.ltoreq.0.88, wherein fB21 is the effective focal length of the first adhesive lens B21 and fB22 is the effective focal length of the second adhesive lens B22. Through the focal length ratio of the first bonding lens B21 and the second bonding lens B22, the deflection degree of light passing through the first bonding lens B21 and the second bonding lens B22 can be slowed down, the distortion of an imaging lens can be corrected, and the low distortion effect is realized.
In the exemplary embodiment, the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11 constitute a four-cemented lens that satisfies: 2.09.ltoreq.fB4/f.ltoreq.2.91, wherein fB4 is the effective focal length of the four-cemented lens, and f is the total effective focal length of the imaging lens. The adoption of the four-cemented lens can reduce chromatic aberration, and is beneficial to realizing high resolution effect; and the ratio of the focal length of the four cemented lenses to the focal length of the imaging lens is reasonably controlled, so that the upper light and the lower light of the maximum visual field can be favorably suppressed, and the small CRA effect can be realized.
In other exemplary embodiments, the eighth lens L8 may also form a cemented doublet with the ninth lens L9, and the tenth lens L10 may form a cemented doublet with the eleventh lens L11.
In an exemplary embodiment, the imaging lens satisfies: IH/f/FNO is not more than 0.53 and not more than 0.68, wherein IH is the total image height of the imaging lens, f is the total effective focal length of the imaging lens, and FNO is the f-number of the imaging lens. The relationship between the image height and the aperture is favorably balanced by reasonably controlling the relationship between the image height and the effective focal length of the imaging lens and the aperture, so that the image quality is balanced, and the large aperture effect is realized under the condition of a certain image height of the imaging lens.
In an exemplary embodiment, the imaging lens satisfies: -3.46.ltoreq.f1/f.ltoreq.2.43, where f1 is the effective focal length of the first lens and f is the total effective focal length of the imaging lens. The first lens is set to be proper focal power, so that the entrance pupil diameter of the imaging lens can be increased, the aperture of the imaging lens can be increased, and the large aperture effect can be realized.
In an exemplary embodiment, the imaging lens satisfies: -62.34 +.r 81+ R82)/(r101 + R102) +.2.4 where R81 is the radius of curvature of the first surface (e.g., object side) of the eighth lens, R82 is the radius of curvature of the second surface (e.g., image side) of the eighth lens, R101 is the radius of curvature of the first surface (e.g., object side) of the tenth lens, and R102 is the radius of curvature of the second surface (e.g., image side) of the tenth lens. The parameter relation of the curvature radius of the eighth lens and the tenth lens of the imaging lens is reasonably controlled, so that the image surface and the back focal length of the imaging lens are increased, and the large image surface and the long back focal effect are realized.
In an exemplary embodiment, the imaging lens satisfies: BFL is equal to or less than 0.27 and TTL is equal to or less than 0.29, wherein BFL is the optical back focal length of the imaging lens, and TT is the optical total length of the imaging lens. The ratio of the optical back focus to the total optical length is reasonably controlled, so that the imaging lens can realize the long back focus effect under a certain total optical length, and the imaging lens is applicable to various interfaces.
In an exemplary embodiment, the imaging lens satisfies: f3/f is more than or equal to 1.14 and less than or equal to 1.62, wherein f3 is the effective focal length of the third lens, and f is the total effective focal length of the imaging lens. Through reasonable setting of the focal length ratio of the third lens to the optical lens, the deflection degree of light passing through the third lens can be slowed down, smaller distortion is generated, and a low distortion effect is achieved.
In an exemplary embodiment, the imaging lens satisfies: -1.66 +.f4/f +.1.19, where f4 is the effective focal length of the fourth lens and f is the total effective focal length of the imaging lens. Through reasonable setting of the focal length ratio of the fourth lens and the imaging lens, positive spherical aberration is generated, and the positive spherical aberration generated by the third lens is compensated, so that the high-resolution effect is realized.
In an exemplary embodiment, the imaging lens satisfies: -0.85 +.f5/f +.0.62, where f5 is the effective focal length of the fifth lens and f is the total effective focal length of the imaging lens. The focal length ratio of the fifth lens to the imaging lens is reasonably set, so that the fifth lens generates smaller multiplying power chromatic aberration, and the high-resolution effect is realized.
In an exemplary embodiment, the imaging lens satisfies: f6/f is more than or equal to 0.86 and less than or equal to 1.14, wherein f6 is the effective focal length of the sixth lens, and f is the total effective focal length of the imaging lens. The focal length ratio of the sixth lens and the imaging lens is reasonably set, so that smaller vertical axis chromatic aberration is generated, and the imaging lens is favorable for meeting the condition of no heating effect and simultaneously giving consideration to high resolution effect.
In an exemplary embodiment, the imaging lens satisfies: f7/f is more than or equal to 1.28 and less than or equal to 2.23, wherein f7 is the effective focal length of the seventh lens, and f is the total effective focal length of the imaging lens. The focal length ratio of the seventh lens to the imaging lens is reasonably set, so that small coma aberration is generated, and the high-resolution effect is realized.
In an exemplary embodiment, the imaging lens satisfies: -1.84.ltoreq.f8/f.ltoreq.1.28, wherein f8 is the effective focal length of the eighth lens, and f is the total effective focal length of the imaging lens. The eighth lens of the imaging lens is set to be negative focal power, so that the light is lifted, the image surface and the back focal length of the imaging lens are increased, and the large target surface and the long back focal effect are realized; meanwhile, the focal length ratio of the eighth lens and the imaging lens is reasonably set, so that smaller field curvature is generated, the high-resolution effect is realized, the deflection degree of light passing through the eighth lens can be slowed down, smaller distortion is generated, and the low-distortion effect is realized.
In an exemplary embodiment, the imaging lens satisfies: f9/f is more than or equal to 0.75 and less than or equal to 0.94, wherein f9 is the effective focal length of the ninth lens, and f is the total effective focal length of the imaging lens. Through reasonable setting of the focal length ratio of the ninth lens and the imaging lens, positive spherical aberration is generated, negative spherical aberration generated by other lenses is compensated, and the imaging lens is favorable for meeting the condition of no thermal effect and simultaneously giving consideration to high resolution effect.
In an exemplary embodiment, the imaging lens satisfies: -0.71 +.f10/f +.0.6, where f10 is the effective focal length of the tenth lens and f is the total effective focal length of the imaging lens. The tenth lens of the imaging lens is set to be negative focal power, so that the light is lifted, the image surface and the back focal length of the imaging lens are increased, and the large target surface and the long back focal effect are realized; meanwhile, the focal length ratio of the tenth lens and the imaging lens is reasonably set, so that small coma, curvature of field and vertical axis chromatic aberration are generated, and the high-resolution effect is realized.
In an exemplary embodiment, the imaging lens satisfies: and f11/f is more than or equal to 0.76 and less than or equal to 0.83, wherein f11 is the effective focal length of the eleventh lens, and f is the total effective focal length of the imaging lens. The positive spherical aberration is generated by reasonably setting the focal length ratio of the eleventh lens to the imaging lens, and the negative spherical aberration generated by other lenses is compensated, so that the high-resolution effect is realized.
In an exemplary embodiment, the imaging lens may include a plurality of sets of cemented lenses, for example, the first cemented lens B21 and the second cemented lens B22 in the second lens group B2 may constitute a cemented doublet, the third lens L3 and the fourth lens L4 may constitute a cemented doublet, the fifth lens L5 and the sixth lens L6 may constitute a cemented doublet, the eighth lens L8 and the ninth lens L9 may constitute a cemented doublet, the tenth lens L10 and the eleventh lens L11 may constitute a cemented doublet, or the eighth lens L8 to the eleventh lens L11 may constitute a cemented doublet, etc. The adoption of the glued lens is beneficial to reducing the tolerance sensitivity of the lens and improving the yield; the chromatic aberration is reduced and the resolution is improved.
In an exemplary embodiment, the imaging lens may further include a Stop (STO), for example, the stop may be disposed between the fourth lens L4 and the fifth lens L5, and fixed in position with respect to the imaging plane (IMA). The diaphragm is arranged at the position, so that lenses or lens groups in front and behind the diaphragm form a double Gaussian symmetrical structure, and the effect of wide application object distance range is realized.
In an exemplary embodiment, the imaging lens may further include a cover glass or a filter (CG) for protecting the photosensitive element located on the imaging plane (IMA).
In an exemplary embodiment, each lens of the imaging lens may be a glass lens, which is beneficial to balancing high and low temperatures and reducing production cost.
The imaging lens can meet the use requirements of low distortion, large aperture, wide range of used object distances, long back focal length and smaller CRA, and can well cope with future market development trend.
The imaging lens according to the embodiment of the application has the following characteristics: the absolute value of DIS (optical distortion) is less than or equal to 9.81%, so that the reduction degree of an imaging picture is more real; large target surface, total image height IH is more than or equal to 16mm; the large diaphragm, the diaphragm number FNO is more than or equal to 1.10, can promote the uniformity of the imaging picture; the used object Distance range is wide, WD (Working Distance) is 1.5 m-inf (infinity), so that the lens can be suitable for various scenes; no thermalization (-30-70 ℃), so that the lens can maintain performance stability at most of the ambient temperatures; the back focal length can be suitable for various interfaces (such as C/CS and the like); small CRA (CRA less than or equal to 7.533 degrees) and can be matched with various chips.
Specific examples 1 to 6 applicable to the imaging lens of the above embodiment are further described below with reference to the drawings.
Example 1
An imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1.
As shown in fig. 1, the imaging lens of the present embodiment includes 11 lenses with optical power, which are sequentially arranged from an object side to an image side along an optical axis: the first lens L1, the second lens L2 (second lens group B2), the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11.
In this embodiment, the first lens element L1 has a negative refractive power, and the object-side surface thereof is convex and the image-side surface thereof is concave.
In this embodiment, the second lens group B2 includes a second lens element L2, wherein the second lens element L2 has a negative refractive power, a concave object-side surface and a convex image-side surface.
In the present embodiment, the third lens element L3 and the fourth lens element L4 can form a cemented lens, wherein the third lens element L3 has positive refractive power, a convex object-side surface and a concave image-side surface; the fourth lens element L4 has a negative refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is concave. Meanwhile, the fifth lens L5 and the sixth lens L6 may form a cemented lens, wherein the fifth lens L5 has negative optical power, and both the object-side surface and the image-side surface are concave surfaces; the sixth lens element L6 has positive refractive power, and both the object-side surface and the image-side surface are convex. A diaphragm is provided between the fourth lens L4 and the fifth lens L5.
In this embodiment, the seventh lens L7 has positive refractive power, and both the object-side surface and the image-side surface thereof are convex.
In this embodiment, the eighth lens element L8 has negative refractive power, and has a convex object-side surface and a concave image-side surface; the ninth lens L9 has positive focal power, and both an object side surface and an image side surface are convex; the tenth lens L10 has negative focal power, and the object side surface and the image side surface are concave surfaces; the eleventh lens L11 has positive optical power, and both the object side surface and the image side surface are convex.
In addition, in the present embodiment, the eighth lens L8 to the eleventh lens L11 may constitute a four-cemented lens.
In this embodiment, the imaging lens may further include a filter CG for protecting a photosensitive element located on an imaging plane (IMA). Light from the object passes sequentially through the respective optical surfaces surf1 to surf20 and is finally imaged on the imaging surface surf 21.
Table 1 shows some basic parameters of each lens of the imaging lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number. Wherein, the units of curvature radius, thickness/distance are millimeter (mm).
TABLE 1
According to the imaging lens of embodiment 1 of the present application, f-number fno=1.29, hologram height IH is 17.710mm, and principal angle cra= 5.813 °.
Fig. 2 shows an optical distortion curve of the imaging lens of embodiment 1, and as shown in fig. 2, the optical distortion DIS of the imaging lens is less than 8.40% in absolute value. Therefore, the imaging lens given in embodiment 1 can realize low distortion while having good aberration correction capability, and can exhibit good imaging quality.
Example 2
An imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3. In this embodiment 2 and the following embodiments, a description of portions similar to that of embodiment 1 will be omitted for brevity.
As shown in fig. 3, the imaging lens of the present embodiment includes 12 lenses with optical power, which are sequentially arranged from an object side to an image side along an optical axis: the first lens L1, the first cemented lens B21, the second cemented lens B22, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11.
In this embodiment, the second lens group B2 includes a cemented lens composed of a first cemented lens B21 and a second cemented lens B22, wherein the first cemented lens B21 has negative optical power, and an object side surface thereof is concave, and an image side surface thereof is convex; the second adhesive lens B22 has positive focal power, the object side surface is concave, and the image side surface is convex.
In this embodiment, the optical power and the surface profile of the lenses (the first lens L1 and the third lens L3 to the eleventh lens L11) having optical power are the same as those of the foregoing embodiment 1 except for the second lens group B2, and specific description of the features of each lens may refer to the foregoing embodiment 1 and will not be repeated here.
Table 2 shows some basic parameters of each lens of the imaging lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number. Wherein, the units of curvature radius, thickness/distance are millimeter (mm).
TABLE 2
According to the imaging lens of embodiment 2 of the present application, the f-number fno=1.21, the hologram height IH is 17.517mm, and the principal ray angle cra= 4.925 °.
Fig. 4 shows an optical distortion curve of the imaging lens of embodiment 2, and as shown in fig. 4, the optical distortion DIS of the imaging lens is less than 8.58% in absolute value. Therefore, the imaging lens given in embodiment 2 can realize low distortion while having good aberration correction capability, and can exhibit good imaging quality.
Example 3
An imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5.
As shown in fig. 5, the imaging lens of the present embodiment includes 12 lenses with optical power, which are sequentially arranged from an object side to an image side along an optical axis: the first lens L1, the first cemented lens B21, the second cemented lens B22, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11.
In this embodiment, the second lens group B2 includes a cemented lens composed of a first cemented lens B21 and a second cemented lens B22, wherein the first cemented lens B21 has negative optical power, and both the object side and the image side thereof are concave surfaces; the second adhesive lens B22 has positive optical power, and both the object side and the image side thereof are convex. Through rationally setting up the focal power and the shape of each lens in the second lens group B2, can slow down the deflection degree of light through the second lens group B2, be favorable to correcting imaging lens's distortion to realize low distortion effect.
In this embodiment, the optical power and the surface profile of the lenses (the first lens L1 and the third lens L3 to the eleventh lens L11) having optical power are the same as those of the foregoing embodiment 1 except for the second lens group B2, and specific description of the features of each lens may refer to the foregoing embodiment 1 and will not be repeated here.
Table 3 shows some basic parameters of each lens of the imaging lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number. Wherein, the units of curvature radius, thickness/distance are millimeter (mm).
TABLE 3 Table 3
According to the imaging lens of embodiment 3 of the present application, f-number fno=1.21, total image height IH is 17.513mm, main angle cra=5.451 °.
Fig. 6 shows an optical distortion curve of the imaging lens of embodiment 3, and as shown in fig. 6, the optical distortion DIS of the imaging lens is less than 8.29% in absolute value. Therefore, the imaging lens given in embodiment 3 can realize low distortion while having good aberration correction capability, and can exhibit good imaging quality.
Example 4
An imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7.
As shown in fig. 7, the imaging lens of the present embodiment includes 12 lenses with optical power, which are sequentially arranged from an object side to an image side along an optical axis: the first lens L1, the first cemented lens B21, the second cemented lens B22, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11.
Unlike the foregoing embodiment 3, in the present embodiment, the eighth lens L8 and the ninth lens L9 constitute a cemented lens, and the ninth lens L9 and the tenth lens L10 constitute a cemented lens.
In this embodiment, the power and the surface profile of each lens (the first lens L1 and the third lens L3 to the eleventh lens L11) are the same as those of the foregoing embodiment 3, and the number of lenses included in the second lens group B2 and the power and the surface profile of each lens (the first cemented lens B21 and the second cemented lens B22) in the second lens group B2 are the same as those of the foregoing embodiment 3. For a specific description of the characteristics of each lens and lens group, reference should be made to the foregoing embodiment 3, and no further description is given here.
Table 4 shows some basic parameters of each lens of the imaging lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number. Wherein, the units of curvature radius, thickness/distance are millimeter (mm).
TABLE 4 Table 4
According to the imaging lens of embodiment 4 of the present application, f-number fno=1.20, total image height IH is 16.595mm, main angle cra=5.067 °.
Fig. 8 shows an optical distortion curve of the imaging lens of embodiment 4, and as shown in fig. 8, the optical distortion DIS of the imaging lens is less than 7.29% in absolute value. Therefore, the imaging lens given in embodiment 4 can realize low distortion while having good aberration correction capability, and can exhibit good imaging quality.
Example 5
An imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9.
As shown in fig. 9, the imaging lens of the present embodiment includes 12 lenses with optical power, which are sequentially arranged from an object side to an image side along an optical axis: the first lens L1, the first cemented lens B21, the second cemented lens B22, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11.
In this embodiment, the power and the surface profile of each lens (the first lens L1 and the third lens L3 to the eleventh lens L11) are the same as those of the foregoing embodiment 3, and the number of lenses included in the second lens group B2 and the power and the surface profile of each lens (the first cemented lens B21 and the second cemented lens B22) in the second lens group B2 are the same as those of the foregoing embodiment 3. For a specific description of the characteristics of each lens and lens group, reference should be made to the foregoing embodiment 3, and no further description is given here.
Table 5 shows some basic parameters of each lens of the imaging lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number. Wherein, the units of curvature radius, thickness/distance are millimeter (mm).
TABLE 5
According to the imaging lens of embodiment 5 of the present application, the f-number fno=1.20, the hologram height IH is 18.992mm, and the principal ray angle cra= 7.533 °.
Fig. 10 shows an optical distortion curve of the imaging lens of embodiment 5, and as shown in fig. 10, the optical distortion DIS of the imaging lens is less than 9.81% in absolute value. Therefore, the imaging lens given in embodiment 5 can realize low distortion while having good aberration correction capability, and can exhibit good imaging quality.
Example 6
An imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11.
As shown in fig. 11, the imaging lens of the present embodiment includes 12 lenses with optical power, which are sequentially arranged from an object side to an image side along an optical axis: the first lens L1, the first cemented lens B21, the second cemented lens B22, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11.
In this embodiment, the third lens L3 and the fourth lens L4 form a cemented lens, where the third lens L3 has positive optical power, and both the object-side surface and the image-side surface are convex; the fourth lens element L4 has negative refractive power, and both the object-side surface and the image-side surface are concave. Meanwhile, the fifth lens L5 and the sixth lens L6 form a cemented lens, wherein the fifth lens L5 has negative focal power, and both the object side surface and the image side surface are concave surfaces; the sixth lens element L6 has positive refractive power, and both the object-side surface and the image-side surface are convex. A diaphragm is provided between the fourth lens L4 and the fifth lens L5.
In this embodiment, the second lens group B2 includes a cemented lens composed of a first cemented lens B21 and a second cemented lens B22, wherein the optical powers and the surface shapes of the first cemented lens B21 and the second cemented lens B22 are the same as those of the foregoing embodiment 3, and specific reference may be made to the description in embodiment 3, and details thereof will not be repeated here.
In this embodiment, the optical powers and surface shapes of the first lens element L1 and the seventh lens element L7 to the eleventh lens element L11 are the same as those of the foregoing embodiment 3, and reference is made to the foregoing embodiment 3 for specific description of the characteristics of each lens element, which is not repeated here.
Table 6 shows some basic parameters of each lens of the imaging lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number. Wherein, the units of curvature radius, thickness/distance are millimeter (mm).
| Face number | Surface type | Radius of curvature | Thickness/distance | Refractive index Nd | Abbe number Vd |
| surf1 | Spherical surface | 76.114 | 1.048 | 1.517 | 52.19 |
| surf2 | Spherical surface | 22.751 | 8.075 | ||
| surf3 | Spherical surface | -25.184 | 1.326 | 1.500 | 62.09 |
| surf4 | Spherical surface | 448.474 | 5.652 | 1.871 | 40.73 |
| surf5 | Spherical surface | -43.593 | 0.100 | ||
| surf6 | Spherical surface | 30.862 | 6.810 | 1.954 | 32.32 |
| surf7 | Spherical surface | -300.000 | 6.968 | 1.581 | 40.92 |
| surf8 | Spherical surface | 19.189 | 5.438 | ||
| surf9(STO) | Spherical surface | Infinity | 6.249 | ||
| surf10 | Spherical surface | -18.120 | 1.572 | 1.626 | 35.71 |
| surf11 | Spherical surface | 36.058 | 7.735 | 1.618 | 63.41 |
| surf12 | Spherical surface | -25.740 | 0.100 | ||
| surf13 | Spherical surface | 74.114 | 4.582 | ||
| surf14 | Spherical surface | -62.573 | 0.100 | ||
| surf15 | Spherical surface | 47.220 | 0.800 | 1.847 | 23.78 |
| surf16 | Spherical surface | 19.756 | 9.689 | 1.593 | 68.53 |
| surf17 | Spherical surface | -27.002 | 4.364 | 1.728 | 28.31 |
| surf18 | Spherical surface | 22.554 | 8.000 | 1.923 | 20.88 |
| surf19 | Spherical surface | -87.801 | 6.200 | ||
| surf20 | Spherical surface | Infinity | 20.550 | 1.517 | 64.21 |
| surf21 | Spherical surface | Infinity | 3.650 | ||
| surf22(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 6
According to the imaging lens of embodiment 6 of the present application, f-number fno=1.20, total image height IH is 17.705mm, main angle cra= 6.170 °.
Fig. 12 shows an optical distortion curve of the imaging lens of embodiment 6, and as shown in fig. 12, the optical distortion DIS of the imaging lens is less than 8.45% in absolute value. Therefore, the imaging lens given in embodiment 6 can realize low distortion while having good aberration correction capability, and can exhibit good imaging quality.
In summary, the lenses in the above embodiments 1 to 6 satisfy the conditional expressions shown in the following table 7, respectively.
TABLE 7
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but also covers other technical solutions which may be formed by any combination of the features described above or their equivalents without departing from the inventive concept. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (10)
1. An imaging lens, characterized by comprising, in order from an object side to an image side along an optical axis:
a first lens having negative optical power;
a second lens group including at least one lens;
a third lens having positive optical power;
a fourth lens having negative optical power;
a fifth lens having negative optical power;
a sixth lens having positive optical power;
a seventh lens having positive optical power;
an eighth lens having negative optical power;
a ninth lens having positive optical power;
a tenth lens having negative optical power; and
an eleventh lens having positive optical power.
2. The imaging lens as claimed in claim 1, wherein,
the object side surface of the first lens is a convex surface, and the image side surface is a concave surface;
an object side surface of the lens closest to the object side in the second lens group is concave, and an image side surface of the lens closest to the image side is convex;
the object side surface of the third lens is a convex surface;
the image side surface of the fourth lens is a concave surface;
the object side surface and the image side surface of the fifth lens are concave surfaces;
the object side surface and the image side surface of the sixth lens are both convex surfaces;
the object side surface and the image side surface of the seventh lens are both convex surfaces;
the object side surface of the eighth lens is a convex surface, and the image side surface is a concave surface;
the object side surface and the image side surface of the ninth lens are both convex surfaces;
the object side surface and the image side surface of the tenth lens are concave surfaces; and
the object side surface and the image side surface of the eleventh lens are both convex.
3. The imaging lens as claimed in claim 1, wherein the second lens group includes a second lens having negative power, an object side surface of the second lens being concave, and an image side surface being convex.
4. The imaging lens as claimed in claim 1, wherein the second lens group includes a first cemented lens and a second cemented lens, the first cemented lens and the second cemented lens constituting a cemented lens; wherein the first adhesive lens has negative focal power, and the object side surface of the first adhesive lens is a concave surface; the second cemented lens has positive optical power with a convex image side.
5. The imaging lens as claimed in claim 4, wherein a radius of curvature R21 of an object side and a radius of curvature R22 of an image side of the first cemented lens, and a radius of curvature R31 of an object side and a radius of curvature R32 of an image side of the second cemented lens satisfy: -0.01.ltoreq.R 21/R22)/(R31/R32).ltoreq.0.04.
6. The imaging lens as claimed in claim 4, wherein the effective focal length fB21 of the first cemented lens and the effective focal length fB22 of the second cemented lens satisfy: -1.03.ltoreq.fB22/fB21.ltoreq.0.88.
7. The imaging lens according to any one of claims 1-6, wherein the eighth lens to the eleventh lens constitute a four-cemented lens, an effective focal length fB4 of which satisfies with a total effective focal length f of the imaging lens: fB4/f is more than or equal to 2.09 and less than or equal to 2.91.
8. The imaging lens of any of claims 1-6, wherein a total image height IH of the imaging lens, a total effective focal length f of the imaging lens, and an f-number FNO of the imaging lens satisfy: IH/f/FNO is more than or equal to 0.53 and less than or equal to 0.68.
9. The imaging lens of any of claims 1-6, wherein an effective focal length f1 of the first lens and a total effective focal length f of the imaging lens satisfy: -f 1/f is less than or equal to 3.46 and less than or equal to-2.43.
10. The imaging lens according to any one of claims 1-6, wherein a radius of curvature R81 of an object side surface and a radius of curvature R82 of an image side surface of the eighth lens, and a radius of curvature R101 of an object side surface and a radius of curvature R102 of an image side surface of the tenth lens satisfy: 62.34 is less than or equal to (R81+R82)/(R101+R102) and less than or equal to-2.4.
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| CN117908231A (en) * | 2024-03-18 | 2024-04-19 | 舜宇光学(中山)有限公司 | Optical lens |
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