CN115128778A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN115128778A CN115128778A CN202211068744.8A CN202211068744A CN115128778A CN 115128778 A CN115128778 A CN 115128778A CN 202211068744 A CN202211068744 A CN 202211068744A CN 115128778 A CN115128778 A CN 115128778A
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses an optical lens, which comprises the following components in sequence from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens having a negative refractive power, the object-side surface of which is concave and the image-side surface of which is concave; a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; a diaphragm; a fourth lens with positive focal power, wherein the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; a fifth lens having a negative refractive power, an image-side surface of which is concave; a sixth lens with positive focal power, wherein the object-side surface of the sixth lens is a convex surface, and the image-side surface of the sixth lens is a convex surface; a seventh lens having a negative optical power, an image-side surface of which is concave at a paraxial region; the first lens to the seventh lens at least comprise a spherical lens and an aspherical lens. The optical lens has the advantages of small volume, large field angle and high pixel.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to an optical lens.
Background
With the rapid development of image and computer vision technologies, more and more technologies are applied to the automobile field, and vehicle-mounted looking-around systems are also applied to various vehicles more and more. For safety reasons, the vehicle-mounted all-round looking system needs to increase the visual field of a driver and sense the environment of 360 degrees in all directions. The cooperation of a plurality of visual sensors is needed, and then a whole set of video images around the whole vehicle are formed and displayed on a screen of a center console through video synthesis processing, so that a driver can clearly check whether obstacles exist around the vehicle, the operations of backing, parking and the like of the driver are facilitated, and the safety risk is reduced.
The wide-angle lens has the characteristic of large field angle, and can acquire more information under the same condition, so the wide-angle lens is widely applied to a vehicle-mounted all-round system. However, the existing wide-angle lens applied to the vehicle-mounted system generally has the following problems: the lens has low pixels, insufficient resolution and more noise points; due to the wide-angle design, the imaging effect of the marginal field of view is slightly poor; the vehicle-mounted reliability requirement is difficult to meet, the requirement on the environment is severe, and the service life is relatively short.
Disclosure of Invention
Therefore, an object of the present invention is to provide an optical lens having advantages of small volume, large viewing angle, and high pixel.
The invention provides an optical lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens is provided with negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the lens comprises a third lens with positive focal power, wherein the object-side surface of the third lens is a convex surface, and the image-side surface of the third lens is a convex surface; a diaphragm; the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens is provided with negative focal power, and the image side surface of the fifth lens is a concave surface; the lens comprises a sixth lens with positive focal power, wherein the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; a seventh lens having a negative optical power, an image side surface of the seventh lens being concave at a paraxial region; wherein the first lens to the seventh lens at least comprise a spherical lens and an aspherical lens.
Compared with the prior art, the optical lens provided by the invention adopts the combination of seven spherical lenses with specific focal power and the aspheric lens, and has good imaging quality through specific surface shape collocation and reasonable focal power distribution, and can be matched with an imaging chip with higher pixels to realize high-definition imaging; through reasonable collocation of the glass-plastic mixed lenses, the optical lens has good thermal stability in the environment of-40 ℃ to 95 ℃; meanwhile, the size of the lens aperture is reasonably configured, so that the light incoming amount of the system can be enlarged, and the depth of field during shooting can be reduced; through different lens combinations, the vehicle-mounted all-around vision system has an ultra-large field angle of more than 220 degrees, achieves the all-around vision effect, and can well meet the use requirements of the vehicle-mounted all-around vision system.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present invention;
FIG. 2 is a graph illustrating f-theta distortion of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a field curvature graph of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a graph illustrating axial chromatic aberration of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an optical lens system according to a second embodiment of the present invention;
FIG. 6 is a graph showing the f-theta distortion of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a field curvature graph of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a graph illustrating axial chromatic aberration of an optical lens according to a second embodiment of the present invention;
FIG. 9 is a diagram illustrating an optical lens assembly according to a third embodiment of the present invention;
FIG. 10 is a graph showing the f- θ distortion of an optical lens according to a third embodiment of the present invention;
FIG. 11 is a field curvature graph of an optical lens according to a third embodiment of the present invention;
FIG. 12 is a graph illustrating axial chromatic aberration of an optical lens according to a third embodiment of the present invention;
FIG. 13 is a schematic structural diagram of an optical lens assembly according to a fourth embodiment of the present invention;
fig. 14 is a graph showing f-theta distortion of an optical lens according to a fourth embodiment of the present invention;
FIG. 15 is a field curvature graph of an optical lens according to a fourth embodiment of the present invention;
fig. 16 is a graph illustrating an axial chromatic aberration of an optical lens according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The invention provides an optical lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: the lens comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter.
The first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has negative focal power, and the image side surface of the fifth lens is a concave surface;
the sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface;
the seventh lens element has a negative optical power, and an image-side surface of the seventh lens element is concave at a paraxial region;
the first lens to the seventh lens at least comprise a spherical lens and an aspheric lens.
The optical lens provided by the invention adopts reasonable collocation of seven spherical lenses and aspherical lenses, not only can obviously improve the image quality and reduce the aberration, but also can reduce the number of lenses of the lens, reduce the volume and better realize the balance of high pixel and miniaturization of the lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.7mm/rad<f/θ<0.9mm/rad；（1）
105°<θ<120°；（2）
where f denotes an effective focal length of the optical lens, and θ denotes a maximum half field angle of the optical lens. Satisfying above-mentioned conditional expressions (1) and (2), can making optical lens possess great angle of vision, can shoot the scene in the great field of vision scope, still have shorter focal length simultaneously, make the depth of field of camera lens big, can guarantee that the scenery all can clear reappearance on the picture before and after the subject of shooing.
In some embodiments, the optical lens satisfies the following conditional expression:
2.5<DM1/DM7<3.5；（3）
wherein DM1 represents the effective diameter of the first lens and DM7 represents the effective diameter of the seventh lens. Satisfying the above conditional expression (3), the first lens can have a larger aperture, can receive light rays in a larger range, and greatly improves the field angle of the system.
In some embodiments, the optical lens satisfies the following conditional expression:
1<φa/φb<60；（4）
where φ a represents a combined optical power of the first lens, the second lens, and the third lens, φ b represents a combined optical power of the fourth lens, the fifth lens, the sixth lens, and the seventh lens. The lens before the diaphragm forms a front lens group, the lens after the diaphragm forms a rear lens group, the front lens group can effectively converge wide-field-angle object plane light into the lens, and the rear lens group is used for being effectively matched with the front lens group to reasonably remove aberration. Satisfying the above conditional expression (4), the aberration of the system can be better corrected, and the reasonable balance between the high pixel and the ultra-wide viewing angle of the system can be realized.
In some embodiments, the optical lens satisfies the following conditional expression:
-5<f2/f<-2；（5）
-1<R22/R21<-0.15；（6）
where f2 denotes a focal length of the second lens, f denotes an effective focal length of the optical lens, R21 denotes a radius of curvature of an object-side surface of the second lens, and R22 denotes a radius of curvature of an image-side surface of the second lens. Satisfying the above conditional expressions (5) and (6), the second lens can have a proper negative focal power, which is beneficial to the light entering the system more smoothly and reduces the difficulty of aberration correction.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5<f3/f<5；（7）
-5<R31/R32<-0.5；（8）
where f3 denotes a focal length of the third lens, f denotes an effective focal length of the optical lens, R31 denotes a radius of curvature of an object-side surface of the third lens, and R32 denotes a radius of curvature of an image-side surface of the third lens. The conditional expressions (7) and (8) are satisfied, and the shape change of the third lens can be slowed down by adjusting the focal length and the surface shape of the third lens, so that the system sensitivity is reduced, the formability of the lens is improved, and the manufacturing yield is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.15<CT3/TTL<0.35；（9）
2.5<CT3/CT4<4.5；（10）
wherein TTL denotes an optical total length of the optical lens, CT3 denotes a center thickness of the third lens, and CT4 denotes a center thickness of the fourth lens. The three-lens optical system meets the conditional expressions (9) and (10), and the central thicknesses of the third positive lens and the fourth positive lens are reasonably set, so that the three-lens optical system bears main positive focal power in the whole optical system, the focusing efficiency of light rays is accelerated, and the purpose of shortening the total length is achieved.
In some embodiments, the optical lens satisfies the following conditional expression:
1<f4/f<2；（11）
where f4 denotes a focal length of the fourth lens, and f denotes an effective focal length of the optical lens. Satisfy above-mentioned conditional expression (11), through the focus of reasonable setting fourth lens, correction system's that can be better point ball poor colour difference improves the formation of image quality.
In some embodiments, the optical lens satisfies the following conditional expression:
-2.5<f5/f<-1；（12）
0.8<R52/f<1.5；（13）
where f5 denotes a focal length of the fifth lens, f denotes an effective focal length of the optical lens, and R52 denotes a radius of curvature of an image side surface of the fifth lens. The optical system can bear corresponding negative focal power by adjusting the focal length and the surface type of the fifth lens when the conditional expressions (12) and (13) are met, the focusing efficiency of light rays on an image surface can be reduced, and the correction of spherical aberration and chromatic aberration in the optical system is facilitated.
In some embodiments, the optical lens satisfies the following conditional expression:
-8<f7/f<-1；（14）
1<R72/f<5；（15）
where f7 denotes a focal length of the seventh lens, f denotes an effective focal length of the optical lens, and R72 denotes a radius of curvature of an image side surface of the seventh lens. Satisfying the conditional expressions (14) and (15), the seventh lens element can have a suitable negative focal power and a suitable surface shape, which is beneficial to increasing the imaging area of the optical lens, balancing the aberration of the front lens element, and improving the overall imaging quality of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
Nd1>1.7；（16）
Nd3>1.7；（17）
where Nd1 denotes a refractive index of the first lens, and Nd3 denotes a refractive index of the third lens. The first lens and the third lens are made of materials within a specific refractive index range and are complementary with other plastic lenses, so that the size of the lens is effectively reduced, and the imaging stability of the optical lens in a high-temperature and low-temperature environment is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
8<TTL/f<13；（18）
wherein, TTL represents the optical total length of the optical lens, and f represents the effective focal length of the optical lens. Satisfying the conditional expression (18) is advantageous for shortening the overall length of the optical system and achieving miniaturization of the lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.06<BFL/TTL<0.16；（19）
wherein BFL represents the optical back focus of the optical lens, and TTL represents the optical total length of the optical lens. Satisfying the conditional expression (19), the optical back focus of the optical lens can be made larger, which is beneficial to reducing the interference between the lens and the imaging chip, thereby reducing the correction difficulty of the CRA (maximum principal ray incident angle).
In some embodiments, the optical lens satisfies the following conditional expression:
0.7<ET1/CT1< 1.7；（20）
wherein ET1 represents the edge thickness of the first lens and CT1 represents the center thickness of the first lens. The shape of the first lens can be controlled, the thickness ratio of the first lens is reduced, the processing difficulty of the first lens is reduced, and therefore the production cost of the optical lens is reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.1<CT7/f7< -0.01；（21）
wherein CT7 denotes a center thickness of the seventh lens, and f7 denotes a focal length of the seventh lens. The conditional expression (21) is satisfied, and the projection height of light on the imaging surface can be effectively reduced by reasonably setting the focal length and the thickness of the seventh lens, so that the aberration difference among different wavelengths can be reduced, and the correction difficulty of chromatic aberration is reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
0.3<Y R72 / IH<0.6；（22）
wherein, Y R72 And IH represents an image height corresponding to a maximum half field angle of the optical lens. The shape of the seventh lens can be reasonably controlled to be M-shaped when the conditional expression (22) is satisfied, and the aberration correction of the optical system is facilitated.
As an implementation mode, a full plastic lens can be adopted, and glass and plastic can be mixed and matched, so that a good imaging effect can be achieved; in this application, adopt glass to mould to mix the collocation, through the focal power of each lens of rational distribution and optimize aspheric surface shape for this optical lens has good imaging quality, advantage that the angle of vision is big at least. Specifically, the first lens and the third lens adopt glass spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens adopt aspheric lenses, so that aberration can be effectively corrected, imaging quality is improved, and a higher-cost-performance optical performance product is provided.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection part of each lens in the optical lens are different, and specific differences can be referred to the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
In the embodiments of the present invention, when the lenses in the optical lens are aspheric lenses, the aspheric surface types of the lenses all satisfy the following equation:
wherein z represents the height of the distance from the aspheric surface to the aspheric surface vertex in the optical axis direction at the position of height h, c is the paraxial curvature of the surface, k is a quadric coefficient, A 2i Is the aspheric surface type coefficient of 2i order.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention includes, in order from an object side to an image plane S17 along an optical axis: a first lens L1, a second lens L2, a third lens L3, a stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.
The first lens L1 has negative focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave;
the second lens L2 has negative focal power, the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave;
the third lens L3 has positive focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex;
the fourth lens L4 has positive focal power, the object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is convex;
the fifth lens element L5 has negative power, with an object-side surface S9 being convex at paraxial region and an image-side surface S10 being concave;
the sixth lens L6 has positive refractive power, and the object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is convex;
the seventh lens L7 has negative power, the object-side surface S13 of the seventh lens is convex at the paraxial region, and the image-side surface S14 of the seventh lens is concave at the paraxial region;
the object-side surface of the filter G1 is S15, and the image-side surface is S16.
The second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all plastic aspheric lenses, the first lens L1 and the third lens L3 are glass spherical lenses, and glass-plastic mixed lenses are adopted for matching, so that the optical lens has good thermal stability in high and low temperature environments, and meanwhile, the size is small.
Table 1 shows relevant parameters of each lens in the optical lens 100 provided in this embodiment.
TABLE 1
In this embodiment, aspheric parameters of each lens in the optical lens 100 are shown in table 2.
TABLE 2
Referring to fig. 2, fig. 3 and fig. 4, a f- θ distortion curve, a field curvature curve and an axial chromatic aberration curve of the optical lens 100 are respectively shown. It can be seen from fig. 2 that the f-theta distortion value is controlled within ± 4%, which indicates that the f-theta distortion of the optical lens 100 is better corrected. It can be seen from fig. 3 that the curvature of field is controlled within ± 0.1mm, which indicates that the curvature of field of the optical lens 100 is better corrected. It can be seen from fig. 4 that the shift amount of the axial chromatic aberration is controlled within ± 0.02mm, which shows that the optical lens 100 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical lens 200 according to the present embodiment is shown, where the structure of the optical lens 200 in the present embodiment is substantially the same as the structure of the optical lens 100 in the first embodiment, except that an object-side surface S9 of the fifth lens element is concave at a paraxial region, and curvature radii, aspheric coefficients, thicknesses, and materials of the lens surface types are different.
The parameters related to each lens in the optical lens 200 provided in this embodiment are shown in table 3.
TABLE 3
The aspherical parameters of the respective lenses in the optical lens 200 in the present embodiment are shown in table 4.
TABLE 4
Referring to fig. 6, 7 and 8, a f- θ distortion curve, a field curvature curve and an axial chromatic aberration curve of the optical lens 200 are respectively shown. It can be seen from fig. 6 that the f-theta distortion value is controlled within ± 4%, which indicates that the f-theta distortion of the optical lens 200 is better corrected. It can be seen from fig. 7 that the curvature of field is controlled within ± 0.1mm, which indicates that the curvature of field of the optical lens 200 is better corrected. It can be seen from fig. 8 that the shift amount of the axial chromatic aberration is controlled within ± 0.015mm, which indicates that the optical lens 200 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical lens 300 according to a third embodiment of the present invention is shown, where the optical lens 300 of the present embodiment is substantially the same as the first embodiment, and mainly differs in the curvature radius, aspheric coefficient, and thickness of each lens surface type.
Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
In the present embodiment, aspheric parameters of each lens in the optical lens 300 are shown in table 6.
TABLE 6
Referring to fig. 10, 11 and 12, a f- θ distortion curve, a field curvature curve and an axial chromatic aberration curve of the optical lens 300 are respectively shown. As can be seen from fig. 10, the f-theta distortion value is controlled within ± 6.5%, which indicates that the f-theta distortion of the optical lens 300 is better corrected. It can be seen from fig. 11 that the curvature of field is controlled within ± 0.15mm, which indicates that the curvature of field of the optical lens 300 is better corrected. It can be seen from fig. 12 that the shift amount of the axial chromatic aberration is controlled within ± 0.035mm, which shows that the optical lens 300 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Fourth embodiment
Referring to fig. 13, a schematic structural diagram of an optical lens 400 according to a fourth embodiment of the present invention is shown, the optical lens 400 of the present embodiment is substantially the same as the optical lens 400 of the first embodiment, except that an object-side surface S9 of the fifth lens element is a concave surface, an object-side surface S13 of the seventh lens element is a concave surface at a paraxial region, and curvature radii, aspheric coefficients, and thicknesses of the lens surface types are different.
Specifically, the design parameters of the optical lens 400 provided in this embodiment are shown in table 7.
TABLE 7
The surface shape coefficients of the aspherical surfaces of the optical lens 400 in the present embodiment are shown in table 8.
TABLE 8
Referring to fig. 14, 15 and 16, a f-theta distortion curve graph, a field curvature curve graph and an axial chromatic aberration graph of the optical lens 400 are shown, respectively. It can be seen from fig. 14 that the f-theta distortion value is controlled within ± 5.5%, which indicates that the f-theta distortion of the optical lens 400 is better corrected. It can be seen from fig. 15 that the curvature of field is controlled within ± 0.1mm, which indicates that the curvature of field of the optical lens 400 is better corrected. It can be seen from fig. 16 that the shift amount of the axial chromatic aberration is controlled within ± 0.02mm, which indicates that the optical lens 400 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Table 9 shows the optical characteristics corresponding to the above four embodiments, which mainly include the effective focal length F, F #, total optical length TTL, and the values corresponding to each of the above conditional expressions.
TABLE 9
In summary, the optical lens provided by the invention adopts a combination of seven spherical lenses with specific focal power and an aspheric lens, and the optical lens has good imaging quality through specific surface shape collocation and reasonable focal power distribution, and can be matched with an imaging chip with higher pixels to realize high-definition imaging; meanwhile, the size of the lens aperture is reasonably configured, so that the light incoming amount of the system can be enlarged, and the depth of field during shooting can be reduced; through different lens combinations, the vehicle-mounted all-around vision system has an ultra-large field angle exceeding 220 degrees, achieves the all-around vision effect, and can well meet the use requirements of the vehicle-mounted all-around vision system.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (11)
1. An optical lens, comprising, in order from an object side to an image plane along an optical axis:
the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens is provided with negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface;
the lens comprises a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
a diaphragm;
the lens comprises a fourth lens with positive focal power, wherein the object-side surface of the fourth lens is a convex surface, and the image-side surface of the fourth lens is a convex surface;
the fifth lens is provided with negative focal power, and the image side surface of the fifth lens is a concave surface;
the lens comprises a sixth lens with positive focal power, wherein the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface;
a seventh lens having a negative optical power, an image side surface of the seventh lens being concave at a paraxial region;
wherein the first lens to the seventh lens at least comprise a spherical lens and an aspherical lens.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.7mm/rad<f/θ<0.9mm/rad；
105°<θ<120°；
wherein f represents an effective focal length of the optical lens, and θ represents a maximum half field angle of the optical lens.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
2.5<DM1/DM7<3.5；
wherein DM1 represents the effective diameter of the first lens and DM7 represents the effective diameter of the seventh lens.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1<φa/φb <60；
wherein φ a represents a combined optical power of the first lens, the second lens, and the third lens, φ b represents a combined optical power of the fourth lens, the fifth lens, the sixth lens, and the seventh lens.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-5<f2/f<-2；
-1<R22/R21<-0.15；
where f2 denotes a focal length of the second lens, f denotes an effective focal length of the optical lens, R21 denotes a radius of curvature of an object-side surface of the second lens, and R22 denotes a radius of curvature of an image-side surface of the second lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.5<f3/f<5；
-5<R31/R32<-0.5；
where f3 denotes a focal length of the third lens, f denotes an effective focal length of the optical lens, R31 denotes a radius of curvature of an object-side surface of the third lens, and R32 denotes a radius of curvature of an image-side surface of the third lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1<f4/f<2；
where f4 denotes a focal length of the fourth lens, and f denotes an effective focal length of the optical lens.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-2.5<f5/f<-1；
0.8<R52/f<1.5；
where f5 denotes a focal length of the fifth lens, f denotes an effective focal length of the optical lens, and R52 denotes a radius of curvature of an image side surface of the fifth lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-8<f7/f<-1；
1<R72/f<5；
where f7 denotes a focal length of the seventh lens, f denotes an effective focal length of the optical lens, and R72 denotes a radius of curvature of an image side surface of the seventh lens.
10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
Nd1>1.7；
Nd3>1.7；
where Nd1 denotes a refractive index of the first lens, and Nd3 denotes a refractive index of the third lens.
11. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.15<CT3/TTL<0.35；
2.5<CT3/CT4<4.5；
wherein TTL represents an optical total length of the optical lens, CT3 represents a center thickness of the third lens, and CT4 represents a center thickness of the fourth lens.
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