CN115951478B - Optical lens - Google Patents
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- CN115951478B CN115951478B CN202310248821.6A CN202310248821A CN115951478B CN 115951478 B CN115951478 B CN 115951478B CN 202310248821 A CN202310248821 A CN 202310248821A CN 115951478 B CN115951478 B CN 115951478B
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Abstract
The invention discloses an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: a first lens having negative optical power, the image side surface of which is concave; the second lens with negative focal power has concave object side surface and concave image side surface; a diaphragm; the third lens with positive focal power has a convex object side surface and a convex image side surface; a fourth lens with negative focal power, the object side surface of which is a concave surface; the object side surface and the image side surface of the fifth lens with positive focal power are convex; the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex. The optical lens provided by the invention consists of one glass lens and five plastic lenses, and the optical lens has the advantages of wide field of view, short total length and small distortion by correspondingly designing the surface shape of each lens and reasonably distributing the focal power of each lens.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
With the development of society, the living standard of people is continuously improved, and various portable electronic devices (such as smart phones and cameras) cannot meet the demands of consumers. At this time, VR, a technology that can apply virtual information to the real world through computer technology, and superimpose real environment and virtual objects on the same screen in real time, has been developed. At present, VR glasses are more and more frequently used in daily life, and a core component in the VR glasses is an optical system, however, the optical system still has the problems of complex structure, large volume and small angle of view.
Disclosure of Invention
Accordingly, the present invention is directed to an optical lens having at least the advantages of short total length and large angle of view.
The invention provides an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: a first lens having negative optical power, an image side surface of the first lens being a concave surface; a second lens having negative optical power, an image side surface of the second lens being a concave surface; a diaphragm; the object side surface and the image side surface of the third lens are both convex surfaces; a fourth lens with negative focal power, wherein the object side surface of the fourth lens is a concave surface; a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface; a sixth lens with negative focal power, wherein the object side surface of the sixth lens is a concave surface; the optical distortion TD of the optical lens satisfies: the TD is less than 5%.
Still further, the abbe number Vd1 of the material of the first lens satisfies: 30< Vd1<50; the refractive index Nd1 of the material of the first lens satisfies: 1.7< Nd1<2.0.
Further, the total optical length TTL of the optical lens and the actual half image height IH of the optical lens on the imaging plane satisfy: 2.0< TTL/IH <3.5.
Still further, the maximum half field angle θ of the optical lens satisfies: θ > 70 °; the effective focal length f of the optical lens, the maximum half field angle theta of the optical lens and the actual half image height IH of the optical lens on an imaging surface meet the following conditions: 55 DEG < fxθ/IH <65 deg.
Further, the radius of curvature R12 of the image side surface of the first lens element and the radius of curvature R11 of the object side surface of the first lens element satisfy: R12/R11 is more than or equal to 0 and less than 0.05.
Further, the effective focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -1.0< f4/f < -0.9.
Still further, an air space CT12 on the optical axis between the first lens and the second lens, an air space CT23 on the optical axis between the second lens and the third lens, and a center thickness CT1 of the first lens, a center thickness CT2 of the second lens satisfies: 0.52< (CT12+CT23)/(CT1+CT2) <0.58.
Further, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -8.0< (f1+f2)/f < -1.0; the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 1.0< f1/f2<4.0.
Further, the radius of curvature R51 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.5< R51/f <1.5; the radius of curvature R51 of the object-side surface of the fifth lens element and the radius of curvature R52 of the image-side surface of the fifth lens element satisfy the following conditions: -2.5< R51/R52< -0.5.
Further, the maximum effective radius D11 of the first lens object-side surface and the maximum effective radius D62 of the sixth lens image-side surface satisfy the following conditions: 0.8< D11/D62<1.7; the maximum effective radius D11 of the object side surface of the first lens and the actual half image height IH of the optical lens on the imaging surface satisfy the following conditions: 0.8< D11/IH <1.7.
Further, an air space BFL between the image side surface of the sixth lens and the imaging surface on the optical axis and an effective focal length f of the optical lens satisfy: 0.9< BFL/f <1.3.
Compared with the prior art, the invention has the beneficial effects that: according to the optical lens provided by the invention, the surface shape of each lens is reasonably designed and the focal power of each lens is reasonably distributed, so that the optical lens has the advantages of wide field range, short total length, small head and small distortion, is beneficial to shooting a large scene, has a good edge imaging effect, and can meet the requirements of people on the VR lens; meanwhile, through reasonably controlling the thickness of each lens and the interval between each lens, the spacer is not needed to bear between each lens, the use of single parts is reduced, the cost is saved, the stray light of the spacer is avoided, the imaging quality is improved, and the sensitivity in processing is also reduced.
Drawings
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 showing a field curvature of an optical lens according to a first embodiment of the present invention.
Fig. 3 is an F-Theta distortion graph of an optical lens in a first embodiment of the present invention.
Fig. 4 is a graph showing a vertical axis 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 according to a second embodiment of the present invention.
Fig. 6 is a graph showing a field curvature of an optical lens according to a second embodiment of the present invention.
Fig. 7 is an F-Theta distortion graph of an optical lens in 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 according to a third embodiment of the present invention.
Fig. 10 is a graph showing a field curvature of an optical lens according to a third embodiment of the present invention.
Fig. 11 is an F-Theta distortion graph of an optical lens in 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.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. 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 from an object side to an imaging surface along an optical axis: the optical lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens and an optical filter.
The first lens has negative focal power, the object side surface of the first lens is a convex surface or a plane, 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 negative 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 concave surface; the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface.
In some embodiments, the optical lens satisfies the following conditional expression:
2.0<TTL/IH<3.5； （1）
wherein TTL represents the total optical length of the optical lens, and IH represents the actual half-image height of the optical lens on an imaging plane. Satisfying the above conditional expression (1) enables the optical lens to have a large angle of view and a small total length, and simultaneously enables the optical distortion TD to satisfy: the TD is less than 5%. Further, the total optical length TTL of the optical lens and the actual half image height IH of the optical lens on the imaging plane satisfy: 3.0< TTL/IH <3.5.
In some embodiments, the optical lens satisfies the following conditional expression:
θ＞70°；（2）
55°<f×θ/IH<65°； （3）
wherein θ represents the maximum half field angle of the optical lens, f represents the effective focal length of the optical lens, and IH represents the actual half image height of the optical lens on the imaging plane. Meanwhile, the conditional expressions (2) and (3) are satisfied, so that the optical lens has a larger field angle and small distortion is realized. Further, the maximum half field angle θ of the optical lens satisfies: θ > 80 °; the effective focal length f of the optical lens, the maximum half field angle theta of the optical lens and the actual half image height IH of the optical lens on an imaging surface meet the following conditions: 58 DEG < fxθ/IH <60 deg.
In some embodiments, the optical lens satisfies the following conditional expression:
0≤R12/R11<0.05；（4）
wherein R12 represents a radius of curvature of the image side surface of the first lens, and R11 represents a radius of curvature of the object side surface of the first lens. The surface shape of the first lens can be reasonably controlled by satisfying the conditional expression (4), the tolerance sensitivity of the first lens can be reduced, and the yield of the optical lens can be improved. Further, the radius of curvature R12 of the image side surface of the first lens and the radius of curvature R11 of the object side surface of the first lens satisfy: R12/R11 is more than or equal to 0 and less than 0.025.
In some embodiments, the optical lens satisfies the following conditional expression:
-1.0<f4/f<-0.9；（5）
-0.50<R41/R42<-0.1；（6）
wherein f4 represents an effective focal length of the fourth lens element, f represents an effective focal length of the optical lens element, R41 represents a radius of curvature of an object-side surface of the fourth lens element, and R42 represents a radius of curvature of an image-side surface of the fourth lens element. Meanwhile, the surface type of the fourth lens can be reasonably controlled by meeting the conditional expressions (5) and (6), the focal length duty ratio of the fourth lens can be reasonably distributed, the processing and forming of the optical lens are facilitated, and the yield of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.2<R32/R62<0.8；（7）
where R32 represents the radius of curvature of the image side surface of the third lens, and R62 represents the radius of curvature of the image side surface of the sixth lens. The above conditional expression (7) is satisfied, and the third lens and the sixth lens can compress the divergence angle of the light as much as possible, and correct the curvature of field and distortion of the system, thereby realizing better imaging effect. Further, the radius of curvature R32 of the third lens image-side surface and the radius of curvature R62 of the sixth lens image-side surface satisfy: 0.3< R32/R62<0.7.
In some embodiments, the optical lens satisfies the following conditional expression:
0.52<(CT12+CT23)/(CT1+CT2)<0.58；（8）
wherein, CT12 represents the air space on the optical axis between the first lens and the second lens, CT23 represents the air space on the optical axis between the second lens and the third lens, CT1 represents the center thickness of the first lens, and CT2 represents the center thickness of the second lens. The total length of the system of the optical lens can be well controlled by meeting the conditional expression (8), so that the total length of the optical lens can be reduced, and the miniaturization of the lens can be realized; meanwhile, the system height of the optical lens can be well compressed, so that the optical lens is favorable for thinning.
In some embodiments, the optical lens satisfies the following conditional expression:
-8.0<(f1+f2)/f<-1.0；（9）
1.0<f1/f2<4.0； （10）
wherein f1 represents an effective focal length of the first lens, f2 represents an effective focal length of the second lens, and f represents an effective focal length of the optical lens. Meanwhile, the above conditional expressions (9) and (10) are satisfied, and the optical power of the first lens and the second lens is reasonably distributed, so that the light rays with larger field angles can be collected to a larger extent, and the ultra-wide angle setting of the optical lens is realized. Further, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -5.0< (f1+f2)/f < -4.0; the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 2.0< f1/f2<3.0.
In some embodiments, the optical lens satisfies the following conditional expression:
0.5<R51/f <1.5；（11）
-2.5<R51/R52<-0.5；（12）
wherein R51 represents a radius of curvature of the object side surface of the fifth lens element, R52 represents a radius of curvature of the image side surface of the fifth lens element, and f represents an effective focal length of the optical lens element. Meanwhile, the surface type of the fifth lens can be reasonably controlled by meeting the conditional expressions (11) and (12), the turning trend of light rays is slowed down, and the correction of the optical distortion of the optical lens is facilitated. Further, the radius of curvature R51 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.7< R51/f <1.1; the radius of curvature R51 of the object-side surface of the fifth lens element and the radius of curvature R52 of the image-side surface of the fifth lens element satisfy the following conditions: -2.2< R51/R52< -0.9.
In some embodiments, the optical lens satisfies the following conditional expression:
-2.1＜f6/f＜-1.0；（13）
wherein f6 represents an effective focal length of the sixth lens, and f represents an effective focal length of the optical lens. The focal length duty ratio of the sixth lens can be reasonably controlled by satisfying the above conditional expression (13), which is favorable for correcting the aberration of the optical lens, shortening the total length of the lens and realizing miniaturization of the lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.8<D11/D62 <1.7；（14）
0.8<D11/IH<1.7；（15）
wherein D11 represents the maximum effective radius of the object side surface of the first lens element, D62 represents the maximum effective radius of the image side surface of the sixth lens element, and IH represents the actual half-image height of the optical lens element on the imaging plane. Meanwhile, the aperture size of the first lens can be reasonably controlled by meeting the conditional expressions (14) and (15), the size of the lens head is reduced, and the balance of the small-head characteristic and the large wide-angle view field of the optical lens is realized. Further, the maximum effective radius D11 of the first lens object-side surface and the maximum effective radius D62 of the sixth lens image-side surface satisfy: 1.0< D11/D62< 1.3; the maximum effective radius D11 of the object side surface of the first lens and the actual half image height IH of the optical lens on the imaging surface satisfy the following conditions: 1.3< D11/IH <1.5.
In some embodiments, the optical lens satisfies the following conditional expression:
0.9<BFL/f<1.3；（16）
wherein BFL represents an air space between an image side surface of the sixth lens and the imaging surface on the optical axis, and f represents an effective focal length of the optical lens. The condition (16) is satisfied, so that the back focal length of the lens is reasonably controlled, on one hand, the matching degree of the lens and an imaging chip is improved, the interference between the lens and a module is reduced, the assembly yield is improved, and on the other hand, the length of an optical system is reduced, and the miniaturization of the lens is realized. Further, an air space BFL between the image side surface of the sixth lens and the imaging surface on the optical axis and an effective focal length f of the optical lens satisfy: 1.0< BFL/f <1.2.
In some embodiments, the optical lens satisfies the following conditional expression:
30<Vd1<50； （17）
1.7<Nd1<2.0； （18）
where Vd1 represents the abbe number of the material of the first lens, and Nd1 represents the refractive index of the material of the first lens. Meanwhile, the conditional expressions (17) and (18) are satisfied, so that the first lens has the advantages of high refractive index and low dispersion, the correction difficulty of chromatic aberration of an optical imaging system is reduced, the number of lenses is reduced, the structure of the optical lens is simplified and optimized, and the volume and the weight of the optical lens are reduced.
In some embodiments, the first lens is a glass lens, and the second, third, fourth, fifth, and sixth lenses are plastic lenses. By adopting glass-plastic lens mixing, aberration can be effectively corrected, imaging quality is improved, and an optical performance product with higher cost performance is provided.
In some embodiments, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens each employ an aspherical lens. In various embodiments of the present invention, when an aspherical lens is used as a lens in an optical lens, the surface shape of the aspherical lens satisfies the following equation:
wherein z is the sagittal height from the apex of the aspherical surface when the aspherical surface is at a position of height h in the optical axis direction, c is the paraxial curvature of the surface, k is the conic coefficient conic, A 2i The aspherical surface profile coefficient of the 2 i-th order.
The invention is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present invention are intended to be equivalent substitutes within the scope of the present invention.
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 includes, in order from an object side to an imaging surface S15 along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
Specifically, the first lens element L1 has negative refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave; the second lens L2 has negative focal power, the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface; the third lens element L3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex; the fourth lens element L4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave at a paraxial region; the fifth lens element L5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is convex, and an image-side surface S10 of the fifth lens element is convex; the sixth lens L6 has negative focal power, the object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a convex surface; the object side surface of the optical filter is S13, and the image side surface is S14. The first lens L1 is a glass spherical lens, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are plastic aspherical lenses.
The relevant parameters of each lens in the optical lens 100 according to the first embodiment of the present invention are shown in table 1.
TABLE 1
The surface profile coefficients of the aspherical surfaces of the optical lens 100 in this embodiment are shown in table 2.
TABLE 2
In the present embodiment, the schematic structure, the field curvature graph, the F-Theta distortion graph, and the vertical axis color difference graph of the optical lens 100 are shown in fig. 1, 2, 3, and 4, respectively.
Fig. 2 shows a field curvature of the optical lens 100 in the present embodiment, which indicates the extent of curvature of the meridional image plane and the sagittal image plane. As can be seen from the figure, the curvature of field of the image planes in both directions is controlled within ±0.50mm, which indicates that the curvature of field of the optical lens 100 is well corrected.
Fig. 3 shows the F-Theta distortion curve of the optical lens 100 of the present embodiment, which represents distortion at different image heights on the imaging plane. As can be seen from the figure, the optical distortion is controlled within ±4%, indicating that the distortion of the optical lens 100 is well corrected.
Fig. 4 shows a paraxial color difference curve of the optical lens 100 of the present embodiment, which represents a paraxial color difference value between light of different wavelengths and a dominant wavelength. As can be seen from the figure, the vertical chromatic aberration value of each wavelength is within ±3.1μm, indicating that the vertical chromatic aberration of the optical lens 100 is well corrected.
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, where the optical lens 200 includes, in order from an object side to an imaging surface S15 along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
Specifically, the first lens element L1 has negative refractive power, the object-side surface S1 of the first lens element is a plane, and the image-side surface S2 of the first lens element is a concave surface; the second lens L2 has negative focal power, the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface; the third lens element L3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex; the fourth lens element L4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave at a paraxial region; the fifth lens element L5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is convex, and an image-side surface S10 of the fifth lens element is convex; the sixth lens L6 has negative focal power, the object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a convex surface; the object side surface of the optical filter is S13, and the image side surface is S14. The first lens L1 is a glass spherical lens, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are plastic aspherical lenses.
The relevant parameters of each lens in the optical lens 200 according to the second embodiment of the present invention are shown in table 3.
TABLE 3 Table 3
The surface profile coefficients of the aspherical surfaces of the optical lens 200 in this embodiment are shown in table 4.
TABLE 4 Table 4
In the present embodiment, the schematic structure, field curvature graph, F-Theta distortion graph and vertical axis color difference graph of the optical lens 200 are shown in fig. 5, 6, 7 and 8, respectively. As can be seen from fig. 6, the curvature of field of the image planes in both directions is controlled within ±0.10mm, which indicates that the curvature of field of the optical lens 200 is well corrected. As can be seen from fig. 7, the optical distortion is controlled within ±4%, which means that the distortion of the optical lens 200 is well corrected. As can be seen from fig. 8, the paraxial color difference value of each wavelength is within ±2.5m, which means that the paraxial color difference of the optical lens 200 is well corrected.
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 includes, in order from an object side to an imaging surface S15 along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
Specifically, the first lens element L1 has negative refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave; the second lens L2 has negative focal power, the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface; the third lens element L3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex; the fourth lens element L4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave at a paraxial region; the fifth lens element L5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is convex, and an image-side surface S10 of the fifth lens element is convex; the sixth lens L6 has negative focal power, the object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a convex surface; the object side surface of the optical filter is S13, and the image side surface is S14. The first lens L1 is a glass spherical lens, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are plastic aspherical lenses.
The relevant parameters of each lens in the optical lens 300 according to the third embodiment of the present invention are shown in table 5.
TABLE 5
The surface profile coefficients of the aspherical surfaces of the optical lens 300 in this embodiment are shown in table 6.
TABLE 6
In the present embodiment, the schematic structure, field curvature graph, F-Theta distortion graph and vertical axis color difference graph of the optical lens 300 are shown in fig. 9, 10, 11 and 12, respectively. As can be seen from fig. 10, the curvature of field of the image planes in both directions is controlled within ±0.30mm, which indicates that the curvature of field of the optical lens 300 is well corrected. As can be seen from fig. 11, the optical distortion is controlled within ±4%, which means that the distortion of the optical lens 300 is well corrected. As can be seen from fig. 12, the vertical chromatic aberration of each wavelength is within ±3.0 μm, indicating that the vertical chromatic aberration of the optical lens 300 is well corrected.
Table 7 is an optical characteristic corresponding to the above three embodiments, and mainly includes an effective focal length F, an f#, an optical total length TTL, a maximum field angle 2θ, and an actual half image height IH of the system, and a numerical value corresponding to each of the above conditional expressions.
TABLE 7
In summary, the optical lens provided by the invention adopts a structure of molding glass lenses and five plastic lenses, and the optical power of each lens is reasonably distributed by corresponding design on the surface shape of each lens, so that the optical lens has the advantages that the angle of view can reach more than 160 degrees, the total length is less than 3.1mm, the head can be controlled within 2.65mm, and the distortion can be controlled within +/-5%; meanwhile, by reasonably controlling the thickness of the lenses and the distance between the lenses, the spacer is not needed to bear between the lenses, the use of single-part products is reduced, the cost is saved, the stray light of the spacer is avoided, the imaging quality is improved, and the sensitivity in processing is also reduced.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 represent only a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. The scope of the invention should therefore be pointed out in the appended claims.
Claims (10)
1. An optical lens comprising six lenses in order from an object side to an imaging surface along an optical axis, comprising: a first lens having negative optical power, an image side surface of the first lens being a concave surface; a second lens having negative optical power, an image side surface of the second lens being a concave surface; a diaphragm; the object side surface and the image side surface of the third lens are both convex surfaces; a fourth lens with negative focal power, wherein the object side surface of the fourth lens is a concave surface; a fifth lens having positive optical power, an image side surface of the fifth lens being a convex surface; a sixth lens with negative focal power, wherein the object side surface of the sixth lens is a concave surface; wherein, the optical distortion TD of the optical lens satisfies: the TD is less than 5%; the total optical length TTL of the optical lens and the actual half image height IH of the optical lens on an imaging surface meet the following conditions: 2.0< TTL/IH <3.5.
2. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression: 30< Vd1<50;1.7< nd1<2.0; where Vd1 represents the abbe number of the material of the first lens, and Nd1 represents the refractive index of the material of the first lens.
3. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression: θ > 70 °;55 ° < fxθ/IH <65 °; wherein θ represents the maximum half field angle of the optical lens, f represents the effective focal length of the optical lens, and IH represents the actual half image height of the optical lens on the imaging plane.
4. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression: R12/R11 is more than or equal to 0 and less than 0.05; wherein R12 represents a radius of curvature of the image side surface of the first lens, and R11 represents a radius of curvature of the object side surface of the first lens.
5. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression: -1.0< f4/f < -0.9; wherein f4 represents an effective focal length of the fourth lens, and f represents an effective focal length of the optical lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression: 0.52< (c12+c23)/(c1+c2) <0.58; wherein, CT12 represents the air space on the optical axis between the first lens and the second lens, CT23 represents the air space on the optical axis between the second lens and the third lens, CT1 represents the center thickness of the first lens, and CT2 represents the center thickness of the second lens.
7. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression: -8.0< (f1+f2)/f < -1.0;1.0< f1/f2<4.0; wherein f1 represents an effective focal length of the first lens, f2 represents an effective focal length of the second lens, and f represents an effective focal length of the optical lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression: 0.5< R51/f <1.5; -2.5< R51/R52< -0.5; wherein R51 represents a radius of curvature of the object side surface of the fifth lens element, R52 represents a radius of curvature of the image side surface of the fifth lens element, and f represents an effective focal length of the optical lens element.
9. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression: 0.8< D11/D62<1.7;0.8< D11/IH <1.7; wherein D11 represents the maximum effective radius of the object side surface of the first lens element, D62 represents the maximum effective radius of the image side surface of the sixth lens element, and IH represents the actual half-image height of the optical lens element on the imaging plane.
10. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression: 0.9< BFL/f <1.3; wherein BFL represents an air space between an image side surface of the sixth lens and the imaging surface on the optical axis, and f represents an effective focal length of the optical lens.
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| CN116577916B (en) * | 2023-07-13 | 2023-11-14 | 江西联创电子有限公司 | optical lens |
| CN116643384B (en) * | 2023-07-27 | 2023-11-07 | 江西欧菲光学有限公司 | Optical system, lens module and electronic equipment |
| CN117539037B (en) * | 2023-11-30 | 2024-09-06 | 宜昌华鑫智能光学有限公司 | Six-piece-type VR super-wide-angle lens |
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| CN107450159B (en) * | 2017-06-08 | 2019-10-15 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| JP6699949B2 (en) * | 2017-08-09 | 2020-05-27 | カンタツ株式会社 | Imaging lens |
| CN112198631A (en) * | 2020-10-29 | 2021-01-08 | 浙江舜宇光学有限公司 | Image pickup lens assembly |
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