CN113985586A - Wide-angle lens and imaging apparatus - Google Patents
Wide-angle lens and imaging apparatus Download PDFInfo
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- CN113985586A CN113985586A CN202111607918.9A CN202111607918A CN113985586A CN 113985586 A CN113985586 A CN 113985586A CN 202111607918 A CN202111607918 A CN 202111607918A CN 113985586 A CN113985586 A CN 113985586A
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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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- 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
Abstract
The invention discloses a wide-angle lens and imaging equipment, the wide-angle lens comprises the following components in sequence from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens with negative focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a diaphragm; a fourth lens with positive focal power, wherein 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 element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex; a sixth lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a seventh lens element with positive optical power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, the seventh lens element having an inflection point on both the object-side surface and the image-side surface. The wide-angle lens has the advantages of large wide angle and large image surface.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to a wide-angle lens and imaging equipment.
Background
Along with the development of the mobile internet and the popularity of social, video and live broadcast software, people are more and more popular in photography, pursuits for imaging effects are more diversified, high-definition image quality is required, an ultra-large visual field is required to shoot pictures with strong large-range visual impact, and the unmanned aerial vehicle wins favor of consumers with unique high-altitude visual angles and wide shooting pictures. At present, unmanned aerial vehicles develop rapidly, and the corresponding requirement on optical lenses matched with the unmanned aerial vehicles is higher and higher.
Because the unmanned aerial vehicle is mostly used in complex environments such as severe vibration, high pressure, extreme temperature and the like, the requirement on the performance of the matched optical lens is extremely high, the unmanned aerial vehicle has good thermal stability to adapt to outdoor severe environments, and light appearance and small weight are required to increase the endurance time of the unmanned aerial vehicle during high-altitude flight shooting; meanwhile, the lens is required to have a large field angle to capture a wide range of pictures. At present, the diversified use requirements of the unmanned aerial vehicle can be hardly met by the conventional optical lens in the market.
Disclosure of Invention
Therefore, the invention aims to provide a wide-angle lens and imaging equipment, which have the advantages of large wide angle and large image surface and can meet diversified use requirements in the fields of unmanned aerial vehicles, motion cameras and the like.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides a wide-angle lens, comprising, in order from an object side to an image plane along an optical axis: the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens is provided with negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the lens comprises a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a diaphragm; the fourth lens with positive focal power is characterized in that the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, and the fifth lens with positive focal power is a convex surface; the sixth lens is provided with 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; a seventh lens having a positive optical power, an object-side surface of the seventh lens being convex at a paraxial region, an image-side surface of the seventh lens being concave at a paraxial region, and both the object-side surface and the image-side surface of the seventh lens having points of inflection.
In a second aspect, the present invention provides an imaging apparatus including an imaging element for converting an optical image formed by the wide-angle lens into an electric signal, and the wide-angle lens provided in the first aspect.
Compared with the prior art, the wide-angle lens and the imaging equipment provided by the invention adopt the matching design of seven spherical lenses and aspheric lenses, realize the large wide-angle effect of the lens through the reasonable arrangement of the surface type and the focal power of each lens, and simultaneously enable the lens to have a larger imaging surface; the lenses are compactly arranged, so that the length of the lens is effectively reduced; the diaphragm and each lens structure of camera lens set up rationally, can make the light quantity of wider scope get into the fuselage, satisfy the formation of image demand of light and shade environment.
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 a wide-angle lens according to a first embodiment of the present invention;
FIG. 2 is a graph showing F-Theta distortion of a wide-angle lens according to a first embodiment of the present invention;
FIG. 3 is a field curvature diagram of a wide-angle lens according to a first embodiment of the present invention;
FIG. 4 is a graph showing an on-axis spherical aberration of a wide-angle lens according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a wide-angle lens according to a second embodiment of the present invention;
FIG. 6 is a graph showing F-Theta distortion of a wide-angle lens according to a second embodiment of the present invention;
FIG. 7 is a field curvature diagram of a wide-angle lens according to a second embodiment of the present invention;
FIG. 8 is a graph showing an on-axis spherical aberration of a wide-angle lens according to a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of a wide-angle lens according to a third embodiment of the present invention;
fig. 10 is a graph showing F-Theta distortion of a wide-angle lens according to a third embodiment of the present invention;
fig. 11 is a field curvature diagram of a wide-angle lens according to a third embodiment of the present invention;
FIG. 12 is a graph showing an on-axis spherical aberration of a wide-angle lens according to a third embodiment of the present invention;
fig. 13 is a schematic configuration diagram of an image forming apparatus according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The invention provides a wide-angle lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: the optical center of each lens is positioned on the same straight line.
The first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex 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 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 has positive focal power, and both the object side surface and the image side surface of the fifth lens are convex surfaces;
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;
the seventh lens element has a positive optical power, the seventh lens element has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; in order to better correct distortion of the lens and light ray aberration at different calibers, the object side surface and the image side surface of the seventh lens are both provided with inflection points.
The diaphragm can be made of shading 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 wide-angle lens is determined by the light through aperture of the diaphragm. The diaphragm is arranged between the third lens and the fourth lens, so that the field angle of the wide-angle lens can be improved, and the incidence angle of the chip can be better matched; 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, in order to improve the resolution of the lens and effectively reduce the vertical axis chromatic aberration of the lens, the wide-angle lens adopts a plurality of aspheric lenses, and the use of the aspheric lenses can better correct the aberration of the lens, improve the resolution of the lens and enable the image to be clearer. Specifically, a first lens, a fourth lens, a fifth lens and a sixth lens in the wide-angle lens are all spherical lenses, and a second lens, a third lens and a seventh lens are all aspheric lenses; it is noted that other spherical and aspherical surface combinations are possible to achieve the imaging effect.
In some embodiments, in order to enable the lens to have stable imaging performance in high and low temperature environments, the lenses in the wide-angle lens may all be made of glass; in order to reduce the production cost of the lens, the partial lens in the wide-angle lens can also be made of plastic materials, and the lens also has good thermal stability by adopting a glass-plastic mixing and matching mode. For example, the first lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses, and the second lens, the third lens and the seventh lens are all glass aspheric lenses.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
140°<FOV<170°；（1）
7.5mm<IH<8.5mm；（2）
wherein FOV represents the maximum field angle of the wide-angle lens, and IH represents the image height corresponding to the maximum field angle of the wide-angle lens. Satisfy above-mentioned conditional expression (1) and (2), can guarantee wide-angle lens possess great angle of vision and imaging surface, can match the imaging demand of big target surface COMS chip.
In some embodiments, the wide-angle lens satisfies the conditional expression:
1.8<TTL/IH<2.0；（3）
wherein TTL denotes the total optical length of the wide-angle lens, and IH denotes the image height corresponding to the maximum field angle of the wide-angle lens. The condition formula (3) is satisfied, the lens is ensured to have a larger imaging surface, and the total length and the volume of the lens are effectively controlled.
In some embodiments, to reduce the head size of the lens, the wide-angle lens satisfies the following conditional expression:
0.8< SD11/SD72 <0.95；（4）
where SD11 denotes an effective aperture of the object-side surface of the first lens, and SD72 denotes an effective aperture of the image-side surface of the seventh lens. Satisfying above-mentioned conditional expression (4), can reducing the head size of camera lens, make the camera lens external diameter size keep unanimous, be favorable to realizing the miniaturization of camera lens. Generally, the outer diameter of the last lens in the lens is basically consistent with the size of the matched imaging chip due to the requirement of a small-angle incidence chip; because of being big wide-angle lens, the bore of first lens can be great, and the size of first lens can influence the volume of whole camera lens simultaneously, consequently is favorable to realizing the miniaturization of camera lens and the equilibrium of big wide-angle through the bore ratio of rationally setting up first lens and last lens in certain extent.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.2<R21/R22<1；（5）
1.2<ET2/CT2<1.3；（6）
where R21 denotes a radius of curvature of an object-side surface of the second lens, R22 denotes a radius of curvature of an image-side surface of the second lens, ET2 denotes an edge thickness of the second lens, and CT2 denotes a center thickness of the second lens. The shape and the edge thickness ratio of the second lens can be reasonably limited and the processing difficulty of the lens can be reduced by satisfying the conditional expressions (5) and (6); if the ET2/CT2 value exceeds the lower limit, the light divergence capability of the second lens is insufficient, and the total length of the lens is long; if the ET2/CT2 value exceeds the upper limit, the edge thickness ratio difference of the second lens is large, and the lens is difficult to machine and mold due to the meniscus lens.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
2<(R32+R31)/(R32-R31)<3；（7）
where R31 denotes a radius of curvature of the object-side surface of the third lens, and R32 denotes a radius of curvature of the image-side surface of the third lens. Satisfying above-mentioned conditional expression (7), can carrying out reasonable control to the face type of third lens to the refraction angle of light in can the effective control system makes light shoot out with more gentle angle, reduces the correction degree of difficulty of aberration in the follow-up system.
In order to better correct chromatic aberration of the system, the fifth lens and the sixth lens form a cemented lens group, and the cemented lens group satisfies the conditional expression:
-0.1<φ56/φ<0.1；（8）
where φ 56 represents the optical power of the cemented lens group, φ represents the optical power of the wide-angle lens. When the value of phi 56/phi exceeds the upper limit, the combined optical focus of the fifth lens and the sixth lens is too strong, and although the purpose of quickly converging light rays can be achieved, the total length of the system can be reduced, various aberrations generated by the lenses are too large and difficult to correct, and meanwhile, the curvature of the lenses is increased, the processing difficulty is improved, and the system error is increased; when the value of phi 56/phi exceeds the lower limit, the combined power of the fifth lens and the sixth lens is reduced, and the various aberrations are relatively reduced, but the total length of the system is increased due to the reduction of the refractive power, which is not favorable for realizing miniaturization.
In some embodiments, to correct chromatic aberration of the lens, the wide-angle lens satisfies the following conditional expression:
50<Vd5–Vd6<60；（9）
vd5 denotes the abbe number of the fifth lens, and Vd6 denotes the abbe number of the sixth lens. Satisfying the above conditional expression (9), the lens material can be more easily selected, and the chromatic aberration correction of the lens is facilitated, so that the picture shot by the lens has higher color reduction degree, and the purple edge and red edge phenomena are effectively corrected.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.5<(YR71+YR72)/IH<0.9；（10）
wherein, YR71Denotes the perpendicular distance, Y, of the inflection point on the object-side surface of the seventh lens from the optical axisR72And IH represents an image height corresponding to a maximum field angle of the wide-angle lens. In order to better correct aberration, the object side surface and the image side surface of the seventh lens are both provided with inflection points; satisfy conditional expression (10), the object side that can rationally set up the seventh lens and the position of the point of inflection on the image side help strengthening the coma of off-axis visual field to correct, and fine convergence field curvature promotes the formation of image quality simultaneously.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.15<φ7/φ<0.3；（11）
1.1<(R72+R71)/(R72-R71)<1.8；（12）
where Φ 7 denotes an optical power of the seventh lens, Φ denotes an optical power of the wide-angle lens, R71 denotes a radius of curvature of an object-side surface of the seventh lens, and R72 denotes a radius of curvature of an image-side surface of the seventh lens. Satisfying the conditional expressions (11) and (12), the focal power and the surface type of the seventh lens can be reasonably controlled, so that the emergent angle of the main light ray is reasonably controlled, the light flux is maintained, and the relative illumination of the optical lens is favorably improved.
In some embodiments, to satisfy the requirement of good light reception of the lens chip, the wide-angle lens satisfies the following conditional expression:
10°< CRA<18°；（13）
the CRA represents an incident angle at which a principal ray of the wide-angle lens is incident on an imaging plane at a maximum field angle. Satisfying the above conditional expression (13), the light passing through the lens group can be ensured to be smoothly emitted into the chip, and the requirement of the chip on the optimal CRA (chief ray angle) can be satisfied.
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 wide-angle 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 in the wide-angle lens is an aspherical lens, each aspherical surface type satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature of the surface, A2iIs aspheric surface of 2i orderThe surface coefficient, k is the conic coefficient, when k is less than-1, the surface curve is hyperbolic curve, when k is equal to-1, it is parabolic curve, when k is between-1 and 0, it is elliptical curve, when k is equal to 0, it is circular curve, when k is greater than 0, it is oblate curve. The surface shape and size of the front and back aspheric surfaces of the lens can be accurately set through the parameters. The aspheric surface shape meets an even-order aspheric surface equation, and different aspheric surface coefficients are utilized, so that the aspheric surface plays the most role in the system, and more perfect resolving power is obtained.
First embodiment
Referring to fig. 1, a schematic structural diagram of a wide-angle lens 100 according to a first embodiment of the present invention is shown, where the wide-angle lens 100 sequentially includes, from an object side to an image plane along an optical axis: the optical center of each lens is positioned on the same straight line, namely, a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.
The first lens L1 has negative focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave;
the second lens L2 has negative focal power, the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is convex;
the third lens L3 has positive focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is 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 L5 has positive optical power, and both the object-side surface S9 and the image-side surface of the fifth lens are convex;
the sixth lens L6 has negative focal power, the object-side surface of the sixth lens is concave, the image-side surface S11 of the sixth lens is convex, the fifth lens L5 and the sixth lens L6 form a cemented lens group, and the image-side surface of the fifth lens and the object-side surface of the sixth lens are cemented to form a cemented surface S10;
the seventh lens L7 has positive optical power, the object-side surface S12 of the seventh lens is convex at the paraxial region, the image-side surface S13 of the seventh lens is concave at the paraxial region, and both the object-side surface S12 and the image-side surface S13 of the seventh lens have points of inflection.
The first lens L1, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all glass spherical lenses, and the second lens L2, the third lens L3 and the seventh lens L7 are all glass aspherical lenses.
The parameters related to each lens of the wide-angle lens 100 provided in the present embodiment are shown in table 1.
TABLE 1
The relevant parameters of the aspherical lens of the wide-angle lens 100 in the present embodiment are shown in table 2.
TABLE 2
Referring to fig. 2, a graph of F-Theta distortion of wide-angle lens 100 in the present embodiment is shown, and it can be seen that the F-Theta distortion of the lens is smaller and within-5%, which indicates that the distortion of wide-angle lens 100 is well corrected.
Referring to fig. 3, a field curvature graph of the wide-angle lens 100 according to the first embodiment of the invention is shown, and it can be seen from the graph that the offset of the field curvature is controlled within ± 0.06 mm, which illustrates that the wide-angle lens 100 can effectively correct the field curvature.
Referring to fig. 4, a graph of on-axis chromatic aberration of the wide-angle lens 100 according to the first embodiment of the present invention is shown, and it can be seen from the graph that the offset of the on-axis chromatic aberration is controlled within ± 0.025 mm, which shows that the wide-angle lens 100 can effectively correct the on-axis chromatic aberration.
Second embodiment
Referring to fig. 5, a schematic structural diagram of a wide-angle lens 200 according to the present embodiment is shown, in which the surface type of each lens of the wide-angle lens 200 in the present embodiment is substantially the same as that of each lens of the wide-angle lens 100 in the first embodiment, except that: the radius of curvature, thickness of each lens and air space between each lens are different. Table 3 shows the relevant parameters of each lens of wide-angle lens 200 in this embodiment.
TABLE 3
The relevant parameters of the aspherical lens of wide-angle lens 200 in the present embodiment are shown in table 4.
TABLE 4
Referring to fig. 6, a graph of F-Theta distortion of wide-angle lens 200 in the present embodiment is shown, and it can be seen that the F-Theta distortion of the lens is smaller and within-8%, which indicates that the distortion of wide-angle lens 200 is well corrected.
Referring to fig. 7, a field curvature graph of the wide-angle lens 200 according to the second embodiment of the present invention is shown, and it can be seen from the graph that the offset of the field curvature is controlled within ± 0.07 mm, which illustrates that the wide-angle lens 200 can effectively correct the field curvature.
Referring to fig. 8, a graph of on-axis chromatic aberration of the wide-angle lens 200 according to the second embodiment of the present invention is shown, and it can be seen from the graph that the offset of the on-axis chromatic aberration is controlled within ± 0.03 mm, which indicates that the wide-angle lens 200 can effectively correct the on-axis chromatic aberration.
Third embodiment
Referring to fig. 9, a schematic structural diagram of a wide-angle lens 300 according to the present embodiment is shown, in which the wide-angle lens 300 in the present embodiment is substantially the same as the wide-angle lens 100 in the first embodiment in terms of surface roughness, but the difference is that: the radius of curvature, thickness of each lens and air space between each lens are different. Table 5 shows the relevant parameters of each lens of wide-angle lens 300 in this embodiment.
TABLE 5
Table 6 shows relevant parameters of the aspherical lens of wide-angle lens 300 in the present embodiment.
TABLE 6
Referring to fig. 10, a graph of F-Theta distortion of wide-angle lens 300 in the present embodiment is shown, and it can be seen that the F-Theta distortion of the lens is smaller and within-6%, which indicates that the distortion of wide-angle lens 300 is well corrected.
Referring to fig. 11, a field curvature graph of the wide-angle lens 300 according to the third embodiment of the invention is shown, and it can be seen from the graph that the offset of the field curvature is controlled within ± 0.06 mm, which illustrates that the wide-angle lens 300 can effectively correct the field curvature.
Referring to fig. 12, a graph of on-axis chromatic aberration of the wide-angle lens 300 according to the third embodiment of the present invention is shown, and it can be seen from the graph that the offset of the on-axis chromatic aberration is controlled within ± 0.03 mm, which shows that the wide-angle lens 300 can effectively correct the on-axis chromatic aberration.
Please refer to table 7, which shows the optical characteristics corresponding to the wide-angle lens provided in the above three embodiments, including the total optical length TTL, the F-number F # and the focal length F of the wide-angle lens, and further including the corresponding related values of each of the above conditional expressions.
TABLE 7
In summary, the wide-angle lens provided by the invention adopts a matched structure of an aspheric surface and a spherical surface, and particularly adopts four glass spherical lenses and three glass aspheric lenses in a specified bit sequence, so that the wide-angle effect of the lens is realized, and the lens has a larger imaging surface; meanwhile, the lenses are compactly arranged, so that the length of the lens is effectively reduced, and the head of the lens is smaller, so that the lens has smaller volume; and because the diaphragm and each lens structure of camera lens set up rationally, can make the light quantity of wider scope get into the fuselage, satisfy the imaging demand of light and shade environment.
Fourth embodiment
Referring to fig. 13, an imaging device 400 according to a fourth embodiment of the present invention is shown, where the imaging device 400 may include an imaging element 410 and a wide-angle lens (e.g., wide-angle lens 100) in any of the embodiments described above. The imaging element 410 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
This imaging device 400 can be the electronic equipment that has loaded above-mentioned wide-angle lens of unmanned aerial vehicle, motion camera, security protection equipment, smart mobile phone and any other form.
The imaging apparatus 400 provided by the present embodiment includes the wide-angle lens 100, and since the wide-angle lens 100 has advantages of a large wide-angle and a large image plane, the imaging apparatus 400 having the wide-angle lens 100 also has advantages of a large wide-angle and a large image plane.
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-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present 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 patent shall be subject to the appended claims.
Claims (12)
1. A wide-angle lens, comprising, in order from an object side to an imaging surface along an optical axis:
the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens is provided with negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the lens comprises a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
a diaphragm;
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;
the lens comprises a fifth lens with positive focal power, wherein both the object-side surface and the image-side surface of the fifth lens are convex surfaces;
the sixth lens is provided with 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;
a seventh lens having a positive optical power, an object-side surface of the seventh lens being convex at a paraxial region, an image-side surface of the seventh lens being concave at a paraxial region, and both the object-side surface and the image-side surface of the seventh lens having points of inflection.
2. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
140°<FOV<170°；
7.5mm<IH<8.5mm；
wherein FOV represents the maximum field angle of the wide-angle lens, and IH represents the image height corresponding to the maximum field angle of the wide-angle lens.
3. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
1.8<TTL/IH<2.0；
wherein, TTL represents the optical total length of the wide-angle lens, and IH represents the image height corresponding to the maximum field angle of the wide-angle lens.
4. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
0.8<SD11/SD72 <0.95；
wherein SD11 represents an effective aperture of the object side surface of the first lens, and SD72 represents an effective aperture of the image side surface of the seventh lens.
5. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
0.2<R21/R22<1；
1.2<ET2/CT2<1.3；
where ET2 denotes an edge thickness of the second lens, CT2 denotes a center thickness of the second lens, R21 denotes a radius of curvature of an object-side surface of the second lens, and R22 denotes a radius of curvature of an image-side surface of the second lens.
6. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
2<(R32+R31)/(R32-R31)<3；
wherein R31 denotes a radius of curvature of an object-side surface of the third lens, and R32 denotes a radius of curvature of an image-side surface of the third lens.
7. The wide-angle lens according to claim 1, wherein the fifth lens and the sixth lens constitute a cemented lens group, and the cemented lens group satisfies the following conditional expression:
-0.1<φ56/φ<0.1；
where φ 56 represents the optical power of the cemented lens group, φ represents the optical power of the wide-angle lens.
8. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
50<Vd5-Vd6<60；
wherein Vd6 denotes an abbe number of the sixth lens, and Vd5 denotes an abbe number of the fifth lens.
9. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
0.5<(YR71+YR72)/IH<0.9；
wherein, YR71Denotes the perpendicular distance, Y, of the inflection point on the object-side surface of the seventh lens from the optical axisR72And IH represents an image height corresponding to a maximum field angle of the wide-angle lens.
10. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
0.15<φ7/φ<0.3；
1.1<(R72+R71)/(R72-R71)<1.8；
where Φ 7 denotes an optical power of the seventh lens, Φ denotes an optical power of the wide-angle lens, R71 denotes a radius of curvature of an object-side surface of the seventh lens, and R72 denotes a radius of curvature of an image-side surface of the seventh lens.
11. The wide-angle lens of claim 1, wherein the first lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses, and the second lens, the third lens and the seventh lens are all glass aspheric lenses.
12. An imaging apparatus comprising the wide-angle lens according to any one of claims 1 to 11, and an imaging element for converting an optical image formed by the wide-angle lens into an electrical signal.
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| CN114509863A (en) * | 2022-04-20 | 2022-05-17 | 江西联创电子有限公司 | Wide-angle lens and imaging apparatus |
| CN117031697A (en) * | 2023-10-08 | 2023-11-10 | 江西联益光学有限公司 | Optical lens |
| CN117369094A (en) * | 2023-12-07 | 2024-01-09 | 联创电子科技股份有限公司 | Optical lens |
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| CN117031697B (en) * | 2023-10-08 | 2024-02-20 | 江西联益光学有限公司 | Optical lens |
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| CN117369094B (en) * | 2023-12-07 | 2024-03-19 | 联创电子科技股份有限公司 | Optical lens |
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Application publication date: 20220128 Assignee: Zhongshan Liantuo Optical Co.,Ltd. Assignor: JIANGXI LIANCHUANG ELECTRONIC Co.,Ltd. Contract record no.: X2023980040632 Denomination of invention: Wide angle lenses and imaging equipment Granted publication date: 20220524 License type: Common License Record date: 20230828 |