CN114265188B - Optical lens and imaging apparatus - Google Patents
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- CN114265188B CN114265188B CN202210195414.9A CN202210195414A CN114265188B CN 114265188 B CN114265188 B CN 114265188B CN 202210195414 A CN202210195414 A CN 202210195414A CN 114265188 B CN114265188 B CN 114265188B
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Abstract
The invention discloses an optical lens and imaging equipment, the optical lens includes from the object side to the imaging surface along the optical axis in turn: a diaphragm; a first lens having a positive refractive power, an object-side surface of which is convex; a second lens element having a positive optical power, the object-side surface of the second lens element being convex and the image-side surface of the second lens element being concave at the paraxial region; a third lens with negative 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 concave surface; a fourth lens having a focal power, an object side surface of which is concave; a fifth lens having optical power; a sixth lens having optical power; wherein the first lens to the sixth lens at least comprise one aspheric lens. The optical lens has the advantages of long focal length, large aperture, short depth of field, high pixel and miniaturization.
Description
Technical Field
The present invention relates to the field of imaging lens technology, and in particular, to an optical lens and an imaging device.
Background
In recent years, with the rise of smart phones, the demands of various large-brand flagship machines on shooting differentiation are gradually increased, and portrait lenses are born, wherein the portrait lenses are generally long-focus lenses, have a short depth of field and a large magnification ratio due to a special long focal length and a small visual angle, can effectively blur a background to highlight a focusing main body, and can make a shot portrait more vivid, so that the long-focus lenses are often called as the portrait lenses.
The Fno (aperture value) of a common telephoto lens is about 3.0, the Fno which is more ahead is 2.0, when a distant object is shot, the focus main body cannot be obviously reflected due to the large depth of field range of the long-focus lens, the shooting effect is finally weakened, the focus main body is highlighted for effectively blurring the background, the Fno of the lens is reduced, and the aperture of the lens is improved so as to reduce the depth of field range of the lens, so that the development trend of a portrait lens is reached.
Disclosure of Invention
Therefore, the present invention is directed to an optical lens and an imaging device, which have the advantages of long focal length, large aperture, short depth of field, high pixel, and miniaturization, and can meet the use requirements of portable electronic devices.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides an optical lens, comprising, in order from an object side to an image plane along an optical axis: a diaphragm; a first lens having a positive optical power, an object side surface of the first lens being convex; a second lens having a positive optical power, the second lens having a convex object-side surface and a concave image-side surface at a paraxial region; the third lens is provided with negative 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 concave surface; a fourth lens having a focal power, an object side surface of the fourth lens being concave; a fifth lens having optical power; a sixth lens having optical power; wherein at least one of the first lens to the sixth lens comprises an aspheric lens; the optical lens satisfies the following conditional expression: 0.5< TTL/f < 2; wherein f represents the effective focal length of the optical lens, and TTL represents the total optical length of the optical lens.
In a second aspect, the present invention provides an imaging apparatus, comprising an imaging element and the optical lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the optical lens into an electrical signal.
Compared with the prior art, the optical lens provided by the invention has the advantages of good imaging quality, long focal length and miniaturization by adopting six aspheric lenses with specific focal power and through specific surface shape collocation and reasonable focal power distribution, and can be matched with a 50M (Megapixel ) imaging chip to realize ultra-high definition imaging; meanwhile, by reasonably configuring the size of the lens aperture, the light incoming amount of the system can be enlarged, the depth of field during shooting can be reduced, the imaging quality of the system in a dark environment is ensured, the main body with the prominent background can be effectively blurred during shooting, and the use requirement of the portable electronic equipment for portrait shooting is 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 graph showing the f-tan θ 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 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 graph showing the f-tan θ 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 vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an optical lens assembly according to a third embodiment of the present invention;
FIG. 10 is a graph showing the f-tan 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 vertical axis chromatic aberration diagram 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 the f-tan θ 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 vertical axis chromatic aberration diagram of an optical lens according to a fourth embodiment of the present invention;
Fig. 17 is a schematic configuration diagram of an image forming apparatus according to a fifth 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 present invention provides an optical lens, sequentially including, from an object side to an image plane along an optical axis: the lens comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an optical filter.
The first lens has positive focal power, and the object side surface of the first lens is a convex surface;
The second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface at a paraxial region;
the third lens is provided with a negative optical focus, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the fourth lens has focal power, and the object side surface of the fourth lens is a concave surface;
the fifth lens has focal power;
the sixth lens has focal power;
wherein, the first lens to the sixth lens at least comprise an aspheric lens;
the optical lens satisfies the following conditional expression:
0.5<TTL/f<2；
wherein f represents the effective focal length of the optical lens, and TTL represents the total optical length of the optical lens.
The optical lens adopts a combination of a plurality of aspheric lenses, the diaphragm is arranged in front of the first lens, so that the longer distance is generated between the exit pupil of the imaging system and the imaging surface, the optical lens has the effect of a large aperture, and meanwhile, the optical lens has good imaging quality through specific surface shape collocation and reasonable focal power distribution; and through reasonably setting the value of TTL/f, the optical lens has a longer effective focal length, and meanwhile, the total length of the lens is shortened, and the miniaturization of the lens is maintained.
Further, the optical lens satisfies the following conditional expression:
1.2<f/EPD<1.8；（1）
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 formula (1) is satisfied, the light inlet quantity of the system can be enlarged, the depth of field during shooting is reduced, the imaging quality of the system in a dark environment is guaranteed, the background can be effectively blurred during shooting, the focusing main body is highlighted, and the effect of the telephoto lens is achieved.
In some embodiments, the optical lens satisfies the following conditional expression:
0<f1/f<3；（2）
-2.5<(R11-R12)/(R11+R12)<-0.1；（3）
where f1 denotes a focal length of the first lens, f denotes an effective focal length of the optical lens, R11 denotes a radius of curvature of an object-side surface of the first lens, and R12 denotes a radius of curvature of an image-side surface of the first lens. Satisfy above-mentioned conditional expression (2) and (3), can prevent to get into optical lens's light deflection range too big, reduce optical lens sensitivity, be favorable to optical lens to balance the aberration better simultaneously, promote optical lens's imaging quality.
In some embodiments, the optical lens satisfies the following conditional expression:
0.2<f2/f<6；（4）
-2<(R21-R22)/(R21+R22)<0；（5）
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. The conditional expressions (4) and (5) are satisfied, and the shape change of the second lens can be slowed down by adjusting the focal length and the surface shape of the second lens, so that the system sensitivity is reduced, the formability of the lens can be improved, and the manufacturing yield is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-5<f1/f3<-1；（6）
where f1 denotes a focal length of the first lens, and f3 denotes a focal length of the third lens. Satisfying above-mentioned conditional expression (6), can enough fine control lens's length, be favorable to structural design, each visual field defocusing curve dispersion of control that again can be fine improves the imaging quality of camera lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.13<CT34/TTL<0.35；（7）
where CT34 denotes an air gap on the optical axis of the third lens to the fourth lens. Satisfying above-mentioned conditional expression (7), through the air interval distance between rational distribution third, four lenses, can promote the focus of system effectively, help reducing the total length of system simultaneously.
In some embodiments, the optical lens satisfies the following conditional expression:
0.45<SD32/SD11<0.65；（8）
where SD11 denotes an effective aperture of the object-side surface of the first lens, and SD32 denotes an effective aperture of the image-side surface of the third lens. Satisfying above-mentioned conditional expression (8), can keeping the system miniaturization, help the coma aberration and the field curvature correction of off-axis visual field simultaneously, promote the formation of image quality.
In some embodiments, the optical lens satisfies the following conditional expression:
1.0<IH/(f×tanθ)<1.05；（9）
where θ represents a half field angle of the optical lens, IH represents an image height corresponding to the half field angle of the optical lens, and f represents an effective focal length of the optical lens. The condition (9) is satisfied, which shows that the distortion of the optical lens is better corrected, and the shape reduction degree of the shot image is extremely high; if the IH/(f multiplied by tan theta) value exceeds the lower limit, the optical imaging system has large negative distortion, and the shot graph can generate obvious deformation and become a barrel shape, thereby influencing the imaging effect; if the IH/(f multiplied by tan theta) value exceeds the upper limit, the optical imaging system has larger positive distortion, and the shot graph can generate obvious deformation and form a pillow shape, thereby influencing the imaging effect.
In some embodiments, the optical lens satisfies the following conditional expression:
9mm/rad<IH/θ<17mm/rad；（10）
where 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 above conditional expression (10), the lens can have a larger imaging surface and a smaller field angle, and can effectively blur the background and highlight the focusing body during shooting, thereby realizing the imaging effect of the telephoto lens.
In some embodiments, the optical lens satisfies the following conditional expression:
2<(CT1+CT2)/(ET1+ET2)<5；（11）
where CT1 denotes the thickness of the first lens on the optical axis, CT2 denotes the thickness of the second lens on the optical axis, ET1 denotes the edge thickness of the first lens, and ET2 denotes the edge thickness of the second lens. The condition (11) is satisfied, so that the thickness ratio of the first lens to the second lens is uniform, and the lens is favorably manufactured and molded; 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:
1.0<f/ΣCT<3.0；（12）
where f denotes an effective focal length of the optical lens, and Σ CT denotes a sum of thicknesses of the first lens to the sixth lens on the optical axis. Satisfying the above conditional expression (12), the total central thickness of each lens is reasonably distributed, so as to improve the manufacturing yield, and simultaneously, the total length of the optical imaging system set is shortened, and the miniaturization is maintained, so that the optical imaging system set is convenient to be applied to portable electronic products.
In some embodiments, the optical lens satisfies the following conditional expression:
2.0<EPD/BFL<4.5；（13）
wherein EPD represents an entrance pupil diameter of the optical lens, and BFL represents a back focal length of the optical lens. Satisfying the above conditional expression (13), a shorter back focus is obtained in a configuration with a large light-transmitting aperture, and the optical lens is further miniaturized.
In some embodiments, the optical lens satisfies the following conditional expression:
10°<CRA<30°；（14）
wherein CRA represents a maximum chief ray incident angle of the optical lens. Satisfying above-mentioned conditional expression (14), the chief ray incident angle of matching chip that can be better promotes the efficiency that the chip received the light energy, avoids unusual phenomena such as formation of image vignetting and color cast simultaneously, realizes good formation of image effect.
In some embodiments, the image-side surface of the first lens element in the optical lens assembly is concave and the object-side surface of the fifth lens element is convex at the paraxial region, and in other embodiments, the image-side surface of the first lens element is convex and the object-side surface of the fifth lens element is concave at the paraxial region. The first lens and the fifth lens are matched and combined in different surface shapes, so that the system can achieve a good imaging effect.
In some embodiments, an image-side surface of a fifth lens element in the optical lens assembly is concave at a paraxial region and an object-side surface of a sixth lens element is convex at a paraxial region, and in other embodiments, the image-side surface of the fifth lens element is convex at a paraxial region and the object-side surface of the sixth lens element is concave at a paraxial region. The fifth lens and the sixth lens are matched and combined in different surface types, and both the fifth lens and the sixth lens can enable the system to achieve a good imaging effect.
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 the application, in order to better reduce the volume of the lens and reduce the cost, the optical lens at least has the advantages of good imaging quality, long focal length, large aperture, short depth of field, low sensitivity and miniaturization by adopting the combination of six plastic lenses and reasonably distributing the focal power of each lens and optimizing the shape of an aspheric surface. Specifically, the first lens element to the sixth lens element can all adopt plastic aspheric lenses, and the aspheric lenses can effectively correct aberration, improve imaging quality and provide optical performance products with higher cost performance.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in 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 each embodiment of the present invention, when the lens is an aspherical lens, the surface shape of the aspherical lens satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position of height h along the optical axis direction, c is the paraxial curvature of the surface, k is conic 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 is shown, where the optical lens 100 sequentially includes, from an object side to an image plane S15 along an optical axis: the lens includes an aperture ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
The first lens element L1 has positive power, the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave at the paraxial region;
the second lens L2 has positive power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave at the paraxial region;
the third lens L3 has negative focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave;
the fourth lens L4 has negative 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 L5 has positive optical power, the object-side surface S9 of the fifth lens is convex at the paraxial region, and the image-side surface S10 of the fifth lens is convex at the paraxial region;
the sixth lens element L6 has a negative power, the sixth lens element having an object-side surface S11 that is concave at the paraxial region and an image-side surface S12 that is concave at the paraxial region;
the object-side surface of the filter G1 is S13, and the image-side surface is S14.
The first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 are all plastic aspheric lenses.
Specifically, the present embodiment provides optical lens 100 having the design parameters of each lens as 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 f-tan θ distortion curve graph, a field curvature curve graph and a vertical axis chromatic aberration graph of the optical lens 100 are respectively shown. It can be seen from fig. 2 that the optical distortion is controlled within ± 2%, which indicates that the distortion of the optical lens 100 is well corrected; it can be seen from fig. 3 that the curvature of field is controlled within ± 0.05mm, which indicates that the curvature of field of the optical lens 100 is better corrected; it can be seen from fig. 4 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 1 micron, which indicates that the vertical axis chromatic aberration of the optical lens 100 is well corrected; 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
Referring to fig. 5, a schematic structural diagram of an optical lens 200 according to a second embodiment of the present invention is shown, the optical lens 200 of the present embodiment is substantially the same as the first embodiment, except that an image-side surface S2 of the first lens element is convex, an object-side surface S9 of the fifth lens element is concave at a paraxial region, and the fourth lens element L4 has positive power, and the curvature radius, aspheric coefficients, thickness and material of each lens surface type are different.
Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in table 3.
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, which are a f-tan θ distortion graph, a field curvature graph and a vertical axis chromatic aberration graph of the optical lens 200, respectively, it can be seen from fig. 6 that the optical distortion is controlled within ± 1%, which indicates that the distortion of the optical lens 200 is well corrected; it can be seen from fig. 7 that the curvature of field is controlled within ± 0.05mm, which indicates that the curvature of field of the optical lens 200 is better corrected; it can be seen from fig. 8 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 1 micron, 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
As shown in fig. 9, the optical lens 300 of this embodiment is substantially the same as the first embodiment except that the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, the image-side surface S10 of the fifth lens element is concave at the paraxial region, the object-side surface S11 of the sixth lens element is convex at the paraxial region, and the curvature radius, aspheric coefficient, thickness and material of each lens surface type are different from each other.
Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in table 5.
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, fig. 11 and fig. 12, which are a f-tan θ distortion graph, a field curvature graph and a vertical axis chromatic aberration graph of the optical lens 300, respectively, it can be seen from fig. 10 that the optical distortion is controlled within ± 2%, which indicates that the distortion of the optical lens 300 is well corrected; it can be seen from fig. 11 that the paraxial curvature of field is controlled within ± 0.05mm, which indicates that the curvature of field of the optical lens 300 is better corrected; it can be seen from fig. 12 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 1 micron, 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
As shown in fig. 13, which is a schematic structural diagram of an optical lens 400 according to the present embodiment, the optical lens 400 according to the present embodiment is substantially the same as the first embodiment, and differs in the curvature radius, aspheric coefficient, thickness and material of each lens surface type, specifically, each lens is configured as follows:
the first lens L1 has positive power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave at the paraxial region;
the second lens L2 has positive power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave at the paraxial region;
the third lens L3 has negative focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave;
the fourth lens element L4 has a negative power, the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is concave at the paraxial region;
the fifth lens element L5 has positive optical power, with an object-side surface S9 of the fifth lens element being convex at the paraxial region and an image-side surface S10 of the fifth lens element being concave at the paraxial region;
the sixth lens element L6 has positive optical power, with an object-side surface S11 of the sixth lens element being convex at the paraxial region and an image-side surface S12 of the sixth lens element being convex at the paraxial region.
Specifically, the design parameters of the optical lens 400 provided in this embodiment are shown in table 7.
TABLE 7
In this embodiment, aspheric parameters of each lens in the optical lens 400 are shown in table 8.
TABLE 8
Referring to fig. 14, 15 and 16, which are a f-tan θ distortion graph, a field curvature graph and a vertical axis chromatic aberration graph of the optical lens 400, respectively, it can be seen from fig. 14 that the optical distortion is controlled within ± 1%, which indicates that the distortion of the optical lens 400 is well corrected; it can be seen from fig. 15 that the paraxial curvature of field is controlled within ± 0.05mm, which indicates that the curvature of field of the optical lens 300 is better corrected; it can be seen from fig. 16 that the vertical chromatic aberration at different wavelengths is controlled within ± 1.2 microns, which indicates that the vertical 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 f-tan θ distortion curve graph, the field curvature curve graph and the vertical axis chromatic aberration curve graph of each embodiment that the f-tan θ distortion value, the field curvature value and the vertical axis chromatic aberration value of the optical lens in each embodiment are within ± 2%, within ± 0.05mm and within ± 1.15 micrometers, which shows that the optical lens provided by the invention has the advantages of high imaging quality, long focal length, large aperture, miniaturization and the like, and has good resolving power.
In summary, the optical lens provided by the invention adopts six aspheric lenses with specific focal power, and through specific surface shape collocation and reasonable focal power distribution, the optical lens has the advantages of good imaging quality, long focal length, low sensitivity and miniaturization, and can be matched with a 50M (Megapixel) imaging chip to realize ultra-high definition imaging; meanwhile, by reasonably configuring the size of the lens aperture, the light incoming amount of the system can be enlarged, the depth of field during shooting can be reduced, the imaging quality of the system in a dark environment is ensured, the main body with the prominent background can be effectively blurred during shooting, and the use requirement of the portable electronic equipment for portrait shooting is better met.
Fifth embodiment
Referring to fig. 17, an imaging apparatus 500 according to a fifth embodiment of the present invention is shown, where the imaging apparatus 500 may include an imaging element 510 and an optical lens (e.g., the optical lens 100) in any of the embodiments described above. The imaging element 510 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 500 may be a smart phone, a tablet computer, a monitoring device, or any other electronic device equipped with the optical lens.
The imaging apparatus 500 provided in the present embodiment includes the optical lens 100, and since the optical lens 100 has advantages of long focal length, large aperture, short depth of field, high pixel, and miniaturization, the imaging apparatus 500 having the optical lens 100 also has advantages of long focal length, large aperture, short depth of field, high pixel, and miniaturization.
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 (12)
1. An optical lens, comprising six lenses in order from an object side to an image plane along an optical axis:
a diaphragm;
a first lens having a positive optical power, an object side surface of the first lens being convex;
a second lens having a positive optical power, the second lens having a convex object-side surface and a concave image-side surface at a paraxial region;
the third lens is provided with negative 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 concave surface;
a fourth lens having a focal power, an object side surface of the fourth lens being concave;
a fifth lens having optical power;
a sixth lens having optical power;
wherein at least one of the first lens to the sixth lens comprises an aspheric lens;
The optical lens satisfies the following conditional expression:
0.5<TTL/f<2；
0.45<SD32/SD11<0.65；
wherein f denotes an effective focal length of the optical lens, TTL denotes an optical total length of the optical lens, SD11 denotes an effective aperture of an object-side surface of the first lens, and SD32 denotes an effective aperture of an image-side surface of the third lens.
2. An optical lens barrel according to claim 1, wherein the image side surface of the first lens element is concave and the object side surface of the fifth lens element is convex at a paraxial region.
3. An optical lens barrel according to claim 2, wherein the image side surface of the fifth lens element is concave at a paraxial region and the object side surface of the sixth lens element is convex at a paraxial region.
4. An optical lens barrel according to claim 1, wherein the image side surface of the first lens element is convex and the object side surface of the fifth lens element is concave at the paraxial region.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.2<f/EPD<1.8；
where f represents an effective focal length of the optical lens, and EPD represents an entrance pupil diameter of the optical lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0<f1/f<3；
-2.5<(R11-R12)/(R11+R12)<-0.1；
Where f1 denotes a focal length of the first lens, f denotes an effective focal length of the optical lens, R11 denotes a radius of curvature of an object-side surface of the first lens, and R12 denotes a radius of curvature of an image-side surface of the first lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.2<f2/f<6；
-2<(R21-R22)/(R21+R22)<0；
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.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-5<f1/f3<-1；
wherein f1 denotes a focal length of the first lens, and f3 denotes a focal length of the third lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.13<CT34/TTL<0.35；
wherein CT34 denotes an air gap on an optical axis between the third lens and the fourth lens, and TTL denotes an optical total length of the optical lens.
10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.0<IH/(f×tanθ)<1.05；
Where θ represents a half field angle of the optical lens, IH represents an image height corresponding to the half field angle of the optical lens, and f represents an effective focal length of the optical lens.
11. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
9mm/rad<IH/θ<17mm/rad；
where 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.
12. An imaging apparatus comprising the optical lens according to any one of claims 1 to 11 and an imaging element for converting an optical image formed by the optical lens into an electric signal.
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| WO2018177416A1 (en) * | 2017-03-31 | 2018-10-04 | 宁波舜宇车载光学技术有限公司 | Optical lens combination and imaging device |
| CN111158118A (en) * | 2020-02-24 | 2020-05-15 | 浙江舜宇光学有限公司 | Optical imaging lens |
| TWM606731U (en) * | 2020-08-10 | 2021-01-21 | 今國光學工業股份有限公司 | Photographing optical lens |
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| CN113514931B (en) * | 2021-04-15 | 2023-05-02 | 浙江舜宇光学有限公司 | Optical imaging lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018177416A1 (en) * | 2017-03-31 | 2018-10-04 | 宁波舜宇车载光学技术有限公司 | Optical lens combination and imaging device |
| CN111158118A (en) * | 2020-02-24 | 2020-05-15 | 浙江舜宇光学有限公司 | Optical imaging lens |
| TWM606731U (en) * | 2020-08-10 | 2021-01-21 | 今國光學工業股份有限公司 | Photographing optical lens |
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