CN114755809A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN114755809A CN114755809A CN202210664516.0A CN202210664516A CN114755809A CN 114755809 A CN114755809 A CN 114755809A CN 202210664516 A CN202210664516 A CN 202210664516A CN 114755809 A CN114755809 A CN 114755809A
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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
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The invention discloses an optical lens, which comprises the following components in sequence from an object side to an imaging surface along an optical axis: a first lens having a negative optical power, the first lens having a concave object-side surface and a convex image-side surface at a paraxial region; a diaphragm; the second lens is provided with positive focal power, and the object side surface and the image side surface of the second lens are convex surfaces; a third lens with negative focal power, wherein the image side surface of the third lens is a concave surface; the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; a fifth lens having a negative optical power, an object-side surface of the fifth lens being convex at a paraxial region and an image-side surface of the fifth lens being concave at a paraxial region; the optical lens comprises at least one aspheric lens. The optical lens has the advantages of large wide angle, small head, large image height and ultra-thin thickness.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
With the rapid growth of consumer electronics market and the popularity of social, video and live broadcast software, people have higher and higher requirements for the imaging quality of the camera lens, and the camera lens even becomes an index of primary consideration when consumers purchase electronic equipment.
With the continuous development of mobile information technology, portable electronic devices such as smart phones are also developing in the directions of light weight, thinness, full-screen, ultra-high-definition imaging and the like, in order to pursue a better imaging effect, higher requirements are put forward on a front-mounted camera lens mounted on the portable electronic device, and certain requirements are put on the aspects of the size of the head of the camera lens, the volume of the camera lens, the imaging stability in a bright-dark environment and the like while focusing on the pixel improvement. However, the existing optical lens has a large head size, so that the screen occupation ratio is difficult to increase, and the front-facing camera lens has a low resolution, so that a super-high definition picture is difficult to capture, and a better visual experience cannot be brought to consumers.
Disclosure of Invention
Therefore, the present invention is directed to provide an optical lens having advantages of large wide angle, small head, large image height, and ultra-thin thickness, so as to meet the requirement of consumer for image capture.
The embodiment of the invention implements the above object by the following technical scheme.
The invention provides an optical lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: a first lens having a negative optical power, the first lens having a concave object-side surface and a convex image-side surface at a paraxial region; a diaphragm; the second lens is provided with positive focal power, and the object side surface and the image side surface of the second lens are convex surfaces; a third lens with negative focal power, wherein the image side surface of the third lens is a concave surface; the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; a fifth lens having a negative optical power, an object-side surface of the fifth lens being convex at a paraxial region and an image-side surface of the fifth lens being concave at a paraxial region; the optical lens comprises at least one aspheric lens.
Compared with the prior art, the optical lens provided by the invention adopts five aspheric lenses with specific shapes, and the lens has a wider field angle and a larger imaging surface through reasonable collocation of the surface type and focal power of each lens and reasonable arrangement of the position of the diaphragm; meanwhile, the surface shape and the caliber of the first lens and the second lens are reasonable, so that the optical lens has a smaller head outer diameter, and the using requirement of the full-face screen can be better met.
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 disclosure;
FIG. 2 is a field curvature diagram of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a graph of on-axis spherical aberration curves of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a vertical axis chromatic aberration diagram 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 field curvature graph of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a graph of on-axis spherical aberration of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a vertical axis chromatic aberration diagram 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 field curvature diagram of an optical lens according to a third embodiment of the present invention;
FIG. 11 is a graph of on-axis spherical aberration of an optical lens according to a third embodiment of the present invention;
FIG. 12 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention;
FIG. 13 is a diagram illustrating an optical lens assembly according to a fourth embodiment of the present invention;
FIG. 14 is a field curvature diagram of an optical lens system according to a fourth embodiment of the present invention;
FIG. 15 is a graph showing an on-axis spherical aberration of an optical lens according to a fourth embodiment of the present invention;
fig. 16 is a vertical axis chromatic aberration diagram of an optical lens according to a fourth embodiment of the 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 shown 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 present invention provides an optical lens, sequentially including, from an object side to an image plane along an optical axis: the lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and an optical filter.
The first lens has negative focal power, the object-side surface of the first lens is a concave surface, and the image-side surface of the first lens is a convex surface at a paraxial region;
the second lens has positive focal power, and both the object side surface and the image side surface of the second lens are convex surfaces;
the third lens has negative focal power, and the image side surface of the third lens is a concave surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens element has a negative optical power, and an object-side surface of the fifth lens element is convex at a paraxial region and an image-side surface of the fifth lens element is concave at a paraxial region.
The diaphragm can be made of masking paper with a light through hole in the center, and the light through aperture of the diaphragm is smaller than that of the space ring, so that the light through amount of the lens is determined by the light through aperture of the diaphragm. The diaphragm is arranged between the first lens and the second lens, so that light rays entering the optical system can be effectively converged, the aperture of the optical system is reduced, the field angle of the lens is improved, and the incidence angle of the main light rays of the corresponding chip is better matched; meanwhile, the shading paper with the light through hole in the center is used as the diaphragm, so that the requirement of the light through hole of the lens cone can be reduced, the forming difficulty of the light through hole of the lens cone is reduced, the production efficiency is improved, and the production cost is reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
-2<R11/f<0；（1）
-4.5<R12/f<-0.5；（2）
wherein R11 denotes a radius of curvature of an object side surface of the first lens, R12 denotes a radius of curvature of an image side surface of the first lens, and f denotes an effective focal length of the optical lens. The surface type of the first lens can be reasonably distributed by satisfying the conditional expressions (1) and (2), so that the first lens has larger negative focal power and simultaneously reduces the caliber as much as possible, and the large wide angle and the small head size of the lens are well balanced.
In some embodiments, the optical lens satisfies the following conditional expression:
0<CT12/TTL<0.07；（3）
Wherein CT12 represents an air space on an optical axis of the first lens and the second lens, and TTL represents a total optical length of the optical lens. Satisfy above-mentioned conditional expression (3), through the air interval between the lens around the reasonable setting diaphragm, be favorable to increasing the aperture diaphragm, increase the light flux of system.
In some embodiments, the optical lens satisfies the following conditional expression:
1.2<IH/f<2.0；（4）
wherein IH denotes an image height corresponding to a half field angle of the optical lens, and f denotes an effective focal length of the optical lens. The condition formula (4) is satisfied, the total optical length of the lens is shorter while the lens has a large image plane, and the balance between the large image plane and the small volume of the lens can be better realized.
In some embodiments, the optical lens satisfies the following conditional expression:
1<R41/R42<4；（5）
1<R51/R52<4；（6）
wherein R41 denotes a radius of curvature of an object-side surface of the fourth lens, R42 denotes a radius of curvature of an image-side surface of the fourth lens, R51 denotes a radius of curvature of an object-side surface of the fifth lens, and R52 denotes a radius of curvature of an image-side surface of the fifth lens. The conditional expressions (5) and (6) are met, the aberration of the system can be corrected better by reasonably distributing the surface shapes of the fourth lens and the fifth lens, the integral imaging quality is improved, meanwhile, the surface shapes of the lenses are easy to process, and the production yield is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
1.1<SD11/SD21<1.8；（7）
wherein SD11 represents the effective aperture of the object side surface of the first lens, and SD21 represents the effective aperture of the object side surface of the second lens. Satisfying above-mentioned conditional expression (7), can closing the light that gets into optical lens fast, reduce the bore of first lens, make the camera lens have less head size, be convenient for improve the screen and account for than.
In some embodiments, the optical lens satisfies the following conditional expression:
0.3<f2/f<1；（8）
0.15<CT2/TTL<0.20；（9）
wherein f2 denotes a focal length of the second lens, f denotes an effective focal length of the optical lens, CT2 denotes a center thickness of the second lens, and TTL denotes a total optical length of the optical lens. Satisfy above-mentioned conditional expression (8), (9), through the focus and the face type of reasonable setting second lens, the chromatic aberration of correction system that can be better improves the imaging quality.
In some embodiments, the optical lens satisfies the following conditional expression:
2.5<SD51/SD11<4.0；（10）
wherein SD11 denotes an effective aperture of the object side surface of the first lens, and SD51 denotes an effective aperture of the object side surface of the fifth lens. The effective aperture of the first lens can be effectively reduced by satisfying the conditional expression (10), so that the lens has smaller head size, the aperture of the opening hole on the screen of the portable electronic equipment is reduced, and the aim of improving the screen occupation ratio is fulfilled; meanwhile, coma aberration and field curvature correction of an off-axis field of view are facilitated, and imaging quality is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
1.1<TTL/IH<1.5；（11）
wherein, TTL represents the optical total length of the optical lens, and IH represents the image height corresponding to the half field angle of the optical lens. And the total length of the lens can be smaller on the premise of large image plane by satisfying the conditional expression (11), so that the lens is miniaturized and high-pixel balance is realized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.1<f5/f1<1；（12）
-5<f3/f4<-1；（13）
wherein f1 denotes a focal length of the first lens, f3 denotes a focal length of the third lens, f4 denotes a focal length of the fourth lens, and f5 denotes a focal length of the fifth lens. The condition formulas (12) and (13) are met, the focal power of each lens is reasonably distributed, the length of each lens is controlled, the structural design is facilitated, the dispersion of the defocusing curves of each field of view can be well controlled, and the imaging quality of the lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5<TTL/f<2.1；（14）
2.5mm/rad<IH/θ<3.0mm/rad；（15）
wherein TTL represents an optical total length of the optical lens, f represents an effective focal length of the optical lens, θ represents a half field angle of the optical lens, and IH represents an image height corresponding to the half field angle of the optical lens. Satisfying the conditional expressions (14) and (15) enables the lens to have a large wide angle and a small total length, thereby realizing the balance between ultra-thin and large wide angle of the lens.
In some embodiments, the optical lens satisfies the following conditional expression:
2.2<f/EPD<2.3；（16）
where f represents an effective focal length of the optical lens, and EPD represents an entrance pupil diameter of the optical lens. When the condition (16) is satisfied, the light input quantity of the system can be enlarged, so that the lens has good imaging quality in both bright and dark environments.
In some embodiments, the optical lens satisfies the following conditional expression:
0.16<SD11/TTL<0.2；（17）
the SD11 represents the effective caliber of the object side surface of the first lens, the TTL represents the optical total length of the optical lens, the conditional expression (17) is met, the caliber of the first lens can be reasonably set, the lens is miniaturized, the structure is more reasonable, and assembly and production are easy.
In some embodiments, the optical lens satisfies the following conditional expression:
5<TTL/BFL<7；（18）
wherein, TTL represents the optical total length of the optical lens, and BFL represents the optical back focus of the optical lens. When the conditional expression (18) is satisfied, the back focus of the lens can be effectively reduced, and the miniaturization of the lens can be realized to the maximum extent.
In some embodiments, the optical lens satisfies the following conditional expression:
1.2<ET5/CT5<4.0；（19）
the ET5 represents the edge thickness of the fifth lens, and the CT5 represents the center thickness of the fifth lens, so that the condition (19) is satisfied, the thickness ratio of the fifth lens is uniform, and lens manufacturing and molding are facilitated; meanwhile, the light incidence angle difference at different areas of the pupil can be reduced, and the system sensitivity is reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
-4< (SAG51-SAG52)/CT5<0；（20）
wherein SAG51 represents the sagged height of the object side surface of the fifth lens, SAG52 represents the sagged height of the image side surface of the fifth lens, and CT5 represents the center thickness of the fifth lens. The surface type of the fifth lens can be reasonably controlled by satisfying the conditional expression (20), so that the fifth lens has a larger negative focal length, and the aberration of the system is favorably corrected.
In some embodiments, the optical lens satisfies the following conditional expression:
35°<CRA<65°；（21）
wherein CRA represents a maximum chief ray incident angle of the optical lens. Satisfy above-mentioned conditional expression (21), the chief ray incident angle of matching the chip that can be better promotes the efficiency that the chip accepted the light energy, avoids unusual phenomena such as formation of image vignetting and color cast simultaneously, realizes good formation of image effect.
As an implementation manner, the optical lens can adopt a full plastic lens, and can also adopt glass-plastic mixed matching, so that a good imaging effect can be obtained; in the application, for the volume that reduces the camera lens better and reduce cost, adopt five plastic lens combinations, through the focal power of rational distribution each lens and optimize aspheric surface shape for this optical lens has good image quality, miniaturized advantage at least. Specifically, the first lens to the fifth lens can all adopt plastic 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 by means of a number of 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 by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the gist of the present invention should be construed as being equivalent replacements within the scope of the present invention.
In each embodiment of the present invention, when an aspherical lens is used as a lens, the surface shape of the aspherical lens satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex at the position of height h along the optical axis direction, c is the paraxial curvature of the surface, and k is conic coefficient, A2iThe coefficient of the aspheric surface type of the 2 i-th order.
First embodiment
Referring to fig. 1, which is a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention, the optical lens 100 sequentially includes, from an object side to an image plane S13 along an optical axis: the lens comprises a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a filter G1, wherein the optical centers of the lenses are positioned on the same straight line.
The first lens L1 has negative power, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex at the paraxial region;
the second lens L2 has positive focal power, and both the object-side surface S3 and the image-side surface S4 of the second lens are convex surfaces;
the third lens L3 has negative power, and both the object-side surface S5 and the image-side surface S6 of the third lens are concave;
the fourth lens L4 has positive focal power, the object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex;
the fifth lens element L5 has a negative power, the object-side surface S9 of the fifth lens element being convex at the paraxial region, and the image-side surface S10 of the fifth lens element being concave at the paraxial region;
the object-side surface of the filter G1 is S11, and the image-side surface is S12.
The first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are all plastic aspheric lenses.
The parameters related to each lens in the optical lens 100 provided in this embodiment are shown in table 1.
TABLE 1
The surface shape coefficients of the aspherical surfaces of the optical lens 100 in the present embodiment are shown in table 2.
TABLE 2
Referring to fig. 2, fig. 3 and fig. 4, a field curvature graph, an on-axis spherical aberration graph and a vertical axis aberration graph of the optical lens 100 are respectively shown. It can be seen from fig. 2 that the curvature of field is controlled within ± 0.2mm, which indicates that the curvature of field of the optical lens 100 is better corrected; it can be seen from fig. 3 that the on-axis spherical aberration is controlled within ± 0.025mm, which indicates that the on-axis aberration of the optical lens 100 is corrected well; it can be seen from fig. 4 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 2.5 microns, which indicates that the vertical axis chromatic aberration of the optical lens 100 is well corrected; in this embodiment, the ratio of the effective aperture SD51 of the object-side surface of the fifth lens element to the effective aperture SD11 of the object-side surface of the first lens element is SD51/SD11=3.53, the effective aperture SD11 of the object-side surface of the first lens element is only 0.66mm, which fully illustrates the characteristic that the optical lens has a small head, the maximum field angle can reach 128 °, and the ratio TTL/IH of the total optical length of the optical lens to the image height corresponding to the half field angle is 1.272. As can be seen from fig. 2, 3, and 4, the aberrations of the optical lens 100 are well balanced, and the optical imaging quality is good.
Second embodiment
Please refer to fig. 5, which is a schematic structural diagram of an optical lens 200 according to a second embodiment of the present invention. The optical lens assembly 200 of the second embodiment of the present invention has substantially the same structure as the optical lens assembly 100 of the first embodiment, and mainly differs therefrom in that the image-side surface S2 of the first lens element is convex at the paraxial region and concave at a region away from the optical axis, the object-side surface S5 of the third lens element is convex at the paraxial region, and the curvature radius, air space and material selection of the respective lens elements are different. Referring to table 3, related parameters of each lens element of the optical lens system 200 according to the second embodiment of the invention are shown.
TABLE 3
The surface shape coefficients of the aspherical surfaces of the optical lens 200 in the present embodiment are shown in table 4.
TABLE 4
Referring to fig. 6, 7 and 8, a field curvature graph, an on-axis spherical aberration graph and a vertical axis aberration graph of the optical lens 200 are shown, respectively. It can be seen from fig. 6 that the curvature of field is controlled within ± 0.05mm, which indicates that the curvature of field of the optical lens 200 is very well corrected; it can be seen from fig. 7 that the on-axis point spherical aberration is controlled within ± 0.02mm, which indicates that the on-axis aberration of the optical lens 200 is corrected well; it can be seen from fig. 8 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 2 microns, which indicates that the vertical axis chromatic aberration of the optical lens 200 is well corrected. As can be seen from fig. 6, 7, and 8, the aberrations of the optical lens 200 are well balanced, and the optical imaging quality is good.
Third embodiment
Fig. 9 is a schematic structural diagram of an optical lens 300 according to a third embodiment of the present invention. The optical lens 300 of the third embodiment of the present invention has substantially the same structure as the optical lens 100 of the first embodiment, and mainly differs therefrom in that the image-side surface S2 of the first lens element is convex at the paraxial region and concave at a region away from the optical axis, the object-side surface S5 of the third lens element is convex at the paraxial region, and the radius of curvature, air space, and material selection of the respective lens elements are different. Referring to table 5, parameters related to each lens of the optical lens 300 according to the third embodiment of the invention are shown.
TABLE 5
The surface shape coefficients of the aspherical surfaces of the optical lens 300 in the present embodiment are shown in table 6.
TABLE 6
Referring to fig. 10, 11 and 12, a field curvature graph, an on-axis spherical aberration graph and a vertical axis aberration graph of the optical lens 300 are shown, respectively. It can be seen from fig. 10 that the curvature of field is controlled within ± 0.05mm, which indicates that the curvature of field of the optical lens 300 is very well corrected; it can be seen from fig. 11 that the on-axis point spherical aberration is controlled within ± 0.02mm, which indicates that the on-axis aberration of the optical lens 300 is corrected well; it can be seen from fig. 12 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 2.5 microns, which indicates that the vertical axis chromatic aberration of the optical lens 300 is well corrected. As can be seen from fig. 10, 11, and 12, the aberrations of the optical lens 300 are well balanced, and the optical imaging quality is good.
Fourth embodiment
Fig. 13 is a schematic structural diagram of an optical lens 400 according to a fourth embodiment of the present invention. The optical lens 400 of the fourth embodiment of the present invention has substantially the same structure as the optical lens 100 of the first embodiment, and mainly differs therefrom in that the image-side surface S2 of the first lens element is convex at the paraxial region and concave at a region away from the optical axis, the object-side surface S5 of the third lens element is convex at the paraxial region, and the curvature radius, air space, and material selection of the respective lens elements are different. Referring to table 7, parameters related to each lens of the optical lens 400 according to the fourth embodiment of the invention are shown.
TABLE 7
TABLE 8
Referring to fig. 14, 15 and 16, a field curvature graph, an on-axis spherical aberration graph and a vertical axis aberration graph of the optical lens 400 are shown, respectively. It can be seen from fig. 14 that the curvature of field is controlled within ± 0.15mm, which indicates that the curvature of field of the optical lens 400 is better corrected; as can be seen from fig. 15, the on-axis point spherical aberration is controlled within ± 0.04mm, which indicates that the on-axis aberration of the optical lens 400 is corrected well; it can be seen from fig. 16 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 2.5 microns, which indicates that the vertical axis chromatic aberration of the optical lens 400 is well corrected. It can be seen from fig. 14, 15 and 16 that the aberrations of the optical lens 400 are well balanced, and the optical imaging quality is good.
Please refer to table 9, which shows the optical characteristics corresponding to the optical lens provided in the above four embodiments, including the viewing angle 2 θ, the total optical length TTL, the image height IH corresponding to the half viewing angle, the effective focal length f, and the related values corresponding to each of the aforementioned conditional expressions.
TABLE 9
It can be seen from the field curvature curve graph, the on-axis sphero-spherical aberration graph and the vertical axis chromatism graph of the above embodiments that the field curvature value of the optical lens in each embodiment is within ± 0.2mm, the on-axis sphero-spherical aberration is within ± 0.03mm, and the vertical axis chromatism is within ± 2.5 microns, which shows that the optical lens provided by the invention has the advantages of high imaging quality, large wide angle, large image height, miniaturization and the like, and has good resolving power.
In summary, the optical lens provided in this embodiment has at least the following advantages:
(1) the optical lens provided by the invention adopts five lenses with specific shapes, and adopts specific surface shape collocation and reasonable focal power distribution, so that the optical lens has the advantages of small head, large wide angle, high pixel, total length and the like.
(2) At present, the head outer diameter of the front lens which is mainstream in the market is about ∅ 2.5.5 mm to ∅ 2.8.8 mm, but the optical lens provided by the invention can be made to ∅ 1.7.7 mm to ∅ 2.1.1 mm due to reasonable arrangement of the diaphragm position and the lens shape, and is greatly helpful for improving the screen occupation ratio.
(3) The optical lens provided by the invention has a larger image surface, and can be matched with an imaging chip with a larger target surface to realize high-definition imaging.
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:
a first lens having a negative optical power, the first lens having a concave object-side surface and a convex image-side surface at a paraxial region;
a diaphragm;
the second lens is provided with positive focal power, and the object side surface and the image side surface of the second lens are convex surfaces;
a third lens with negative focal power, wherein the image side surface of the third lens is a concave surface;
the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
a fifth lens having a negative optical power, an object-side surface of the fifth lens being convex at a paraxial region and an image-side surface of the fifth lens being concave at a paraxial region;
the optical lens comprises at least one aspheric lens.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-2<R11/f<0；
-4.5<R12/f<-0.5；
wherein R11 denotes a radius of curvature of an object side surface of the first lens, R12 denotes a radius of curvature of an image side surface of the first lens, and f denotes an effective focal length of the optical lens.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0<CT12/TTL<0.07；
Wherein CT12 represents an air space on an optical axis of the first lens and the second lens, and TTL represents a total optical length of the optical lens.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.2<IH/f<2.0；
wherein IH denotes an image height corresponding to a half field angle of the optical lens, and f denotes an effective focal length of the optical lens.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1<R41/R42<4；
1<R51/R52<4；
wherein R41 denotes a radius of curvature of an object-side surface of the fourth lens, R42 denotes a radius of curvature of an image-side surface of the fourth lens, R51 denotes a radius of curvature of an object-side surface of the fifth lens, and R52 denotes a radius of curvature of an image-side surface of the fifth lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.1<SD11/SD21<1.8；
wherein SD11 represents the effective aperture of the object side surface of the first lens, and SD21 represents the effective aperture of the object side surface of the second lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.3<f2/f<1；
0.15<CT2/TTL<0.20；
Wherein f2 denotes a focal length of the second lens, f denotes an effective focal length of the optical lens, CT2 denotes a center thickness of the second lens, and TTL denotes a total optical 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<SD51/SD11<4.0；
wherein SD51 denotes an effective aperture of the object side surface of the fifth lens, and SD11 denotes an effective aperture of the object side surface of the first lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.1<TTL/IH<1.5；
wherein, TTL represents the optical total length of the optical lens, and IH represents the image height corresponding to the half field angle of the optical lens.
10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.1<f5/f1<1；
-5<f3/f4<-1；
wherein f1 denotes a focal length of the first lens, f3 denotes a focal length of the third lens, f4 denotes a focal length of the fourth lens, and f5 denotes a focal length of the fifth lens.
11. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.5<TTL/f<2.1；
2.5mm/rad<IH/θ<3.0mm/rad；
wherein TTL represents an optical total length of the optical lens, f represents an effective focal length of the optical lens, θ represents a half field angle of the optical lens, and IH represents an image height corresponding to the half field angle of the optical lens.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018205521A (en) * | 2017-06-02 | 2018-12-27 | カンタツ株式会社 | Imaging lens |
| CN110865448A (en) * | 2019-11-22 | 2020-03-06 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| CN113031215A (en) * | 2021-03-19 | 2021-06-25 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN113156617A (en) * | 2021-04-28 | 2021-07-23 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN114002822A (en) * | 2021-12-10 | 2022-02-01 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
| CN114047611A (en) * | 2021-12-15 | 2022-02-15 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114114629A (en) * | 2021-12-03 | 2022-03-01 | 浙江舜宇光学有限公司 | Camera lens |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018205521A (en) * | 2017-06-02 | 2018-12-27 | カンタツ株式会社 | Imaging lens |
| CN110865448A (en) * | 2019-11-22 | 2020-03-06 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| CN113031215A (en) * | 2021-03-19 | 2021-06-25 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN113156617A (en) * | 2021-04-28 | 2021-07-23 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN114114629A (en) * | 2021-12-03 | 2022-03-01 | 浙江舜宇光学有限公司 | Camera lens |
| CN114002822A (en) * | 2021-12-10 | 2022-02-01 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
| CN114047611A (en) * | 2021-12-15 | 2022-02-15 | 浙江舜宇光学有限公司 | Optical imaging lens |
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