CN114002828B - Panoramic lens and imaging device - Google Patents
Panoramic lens and imaging device Download PDFInfo
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- CN114002828B CN114002828B CN202111585198.0A CN202111585198A CN114002828B CN 114002828 B CN114002828 B CN 114002828B CN 202111585198 A CN202111585198 A CN 202111585198A CN 114002828 B CN114002828 B CN 114002828B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 36
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 230000014509 gene expression Effects 0.000 claims description 25
- 239000011521 glass Substances 0.000 claims description 14
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- 238000010586 diagram Methods 0.000 description 17
- 230000000007 visual effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 3
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
Abstract
The invention discloses a panoramic lens and imaging equipment, the panoramic lens sequentially comprises 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 convex surface, and the image side surface of the second lens is a concave surface; a third lens having positive optical power; a diaphragm; a fourth lens with positive focal power, the object side surface of which is a convex surface; a fifth lens with negative focal power, wherein the object side surface and the image side surface of the fifth lens are concave surfaces; a sixth lens with positive focal power, wherein the object side surface and the image side surface of the sixth lens are convex, and the fifth lens and the sixth lens form a cementing body; the object side surface of the seventh lens is convex, the image side surface of the seventh lens is convex at a paraxial region, and the image side surface of the seventh lens is provided with an inflection point. The panoramic lens has the advantages of large aperture, high resolution and ultra-large wide angle.
Description
Technical Field
The present invention relates to the field of imaging lenses, and in particular, to a panoramic lens and an imaging device.
Background
Along with the development of the mobile internet and the popularity of social, video and live broadcast software, people have higher and higher preference degree for photography, and pursuit of imaging effect is more diversified, so that high-definition image quality is required, and an ultra-large visual field is required to shoot pictures with strong large-scale visual impact, wherein the unmanned aerial vehicle gains consumer preference in virtue of a unique high-altitude visual angle and a wide shooting picture. At present, unmanned aerial vehicles develop rapidly, and the corresponding requirements on panoramic lenses matched with the unmanned aerial vehicles are also higher and higher.
Because unmanned aerial vehicle is used under complex environments such as severe vibration, high pressure and extreme temperature, the performance requirement on the matched panoramic lens is extremely high, so that the unmanned aerial vehicle has good thermal stability to adapt to outdoor severe environments, and also has light and handy appearance and smaller weight, so that the endurance time of unmanned aerial vehicle in high-altitude flight shooting is increased; meanwhile, the lens is required to have a large aperture so as to meet the requirement that the unmanned aerial vehicle can shoot clear and vivid pictures in various environments such as the daytime, the night and the like. At present, conventional panoramic lenses in the market hardly meet the use requirements of unmanned aerial vehicle diversification.
Disclosure of Invention
Therefore, the invention aims to provide a panoramic lens and imaging equipment, which have the advantages of large aperture, high resolution and ultra-large wide angle, and can meet the diversified use requirements of the fields of unmanned aerial vehicles, moving cameras and the like.
The embodiment of the invention realizes the aim through the following technical scheme.
In a first aspect, the present invention provides a panoramic lens comprising, in order from an object side to an imaging plane along an optical axis: a first lens with negative focal power, 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; a second lens with negative focal power, wherein 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; a third lens having positive optical power; a diaphragm; a fourth lens with positive focal power, wherein the object side surface of the fourth lens is a convex surface; a fifth lens with negative focal power, wherein an object side surface and an image side surface of the fifth lens are concave surfaces; a sixth lens having positive optical power, an object side surface and an image side surface of the sixth lens being convex, and the fifth lens and the sixth lens forming a cemented body; a seventh lens element with positive refractive power having a convex object-side surface, a convex image-side surface at a paraxial region, and an inflection point; the panoramic lens comprises at least one glass spherical lens and at least one glass aspherical lens; the panoramic lens satisfies the following conditional expression: 0.5< f/SD ST <1, wherein f represents the effective focal length of the panoramic lens, SD ST Representing the maximum aperture of the diaphragm.
In a second aspect, the present invention provides an imaging apparatus, including an imaging element and the panoramic lens provided in the first aspect, where the imaging element is configured to convert an optical image formed by the panoramic lens into an electrical signal.
Compared with the prior art, the panoramic lens and the imaging device provided by the invention adopt the mixed matching structure of the glass spherical lens and the glass aspherical lens, so that aberration can be effectively corrected; the arrangement among the lenses is compact, so that the length of the lens is effectively reduced; the diaphragm and each lens structure of the lens are reasonably arranged, so that the light quantity in a larger range can enter the body, and the imaging requirement of a bright and dark environment is met.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a panoramic lens according to a first embodiment of the present invention;
fig. 2 is an MTF diagram of a panoramic lens according to a first embodiment of the present invention;
FIG. 3 is an F-Theta distortion plot of a panoramic lens according to a first embodiment of the invention;
FIG. 4 is a graph of on-axis point spherical aberration of a panoramic lens according to a first embodiment of the invention;
fig. 5 is a schematic structural diagram of a panoramic lens according to a second embodiment of the present invention;
fig. 6 is an MTF diagram of a panoramic lens according to a second embodiment of the present invention;
FIG. 7 is an F-Theta distortion plot of a panoramic lens according to a second embodiment of the invention;
FIG. 8 is a graph of on-axis point spherical aberration of a panoramic lens according to a second embodiment of the invention;
fig. 9 is a schematic structural diagram of a panoramic lens according to a third embodiment of the present invention;
fig. 10 is an MTF diagram of a panoramic lens according to a third embodiment of the present invention;
FIG. 11 is an F-Theta distortion plot of a panoramic lens according to a third embodiment of the invention;
FIG. 12 is a graph of on-axis point spherical aberration for a panoramic lens according to a third embodiment of the invention;
fig. 13 is a schematic structural view of an image forming apparatus according to a fourth embodiment of the present invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in 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 a panoramic lens, which sequentially comprises from an object side to an imaging surface along an optical axis: the optical centers of the first lens, the second lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the optical filter are 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 convex surface, and the image side surface of the second lens is a concave surface;
the third lens is provided with positive focal power, the object side surface of the third lens is a concave surface, the image side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, or the object side surface of the third lens is a convex surface, the image side surface of the third lens is a convex surface;
a diaphragm;
the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface;
the fifth lens has negative focal power, and both the object side surface and the image side surface of the fifth lens are concave surfaces;
the sixth lens has positive focal power, the object side surface and the image side surface of the sixth lens are convex, and the fifth lens and the sixth lens form a cementing body;
the seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface at a paraxial region.
The aperture can be a shading paper with a light-passing hole in the center, and the light-passing caliber of the aperture is smaller than that of the space ring, so that the light-passing quantity of the panoramic lens is determined by the light-passing aperture of the aperture. The diaphragm is arranged between the third lens and the fourth lens, so that the view angle of the panoramic lens can be improved, and the incidence angle of the chip can be matched better; meanwhile, the shading paper with the light-passing hole in the center is used as a diaphragm, so that the requirement of the lens barrel on the light-passing hole can be reduced, the molding difficulty of the lens barrel on the light-passing hole 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 chromatic aberration of the lens, the panoramic lens adopts a plurality of aspherical lenses, and the use of the aspherical lenses can better correct the aberration of the lens, improve the resolution of the lens and make the imaging clearer. Specifically, the first lens, the third lens, the fifth lens and the sixth lens in the panoramic lens are all glass spherical lenses, and the second lens, the fourth lens and the seventh lens are all glass aspherical lenses.
In some embodiments, to correct aberrations of the lens and aberrations of the light rays at different apertures, the image-side surface of the seventh lens element has a inflection point.
In some embodiments, the panoramic lens satisfies the following conditional expression:
0.5< f/SD ST <1；（1）
wherein f represents the effective focal length of the panoramic lens, SD ST Representing the entrance pupil diameter of the diaphragm. The condition (1) is satisfied, so that the lens has the characteristic of an oversized aperture, and the light quantity is enough under the condition of ensuring the imaging quality, thereby satisfying the imaging requirement of a bright and dark environment.
In some embodiments, the panoramic lens satisfies the following conditional expression:
4.5mm<IH<5.6mm；（2）
IH represents the image height corresponding to the maximum field angle of the panoramic lens. The condition (2) is satisfied, so that the panoramic lens can be ensured to have a larger imaging surface, and the imaging requirement of a large target surface COMS chip can be matched.
In some embodiments, the panoramic lens satisfies the conditional expression:
3<TTL/IH<3.5；（3）
wherein TTL represents the total optical length of the panoramic lens, and IH represents the image height corresponding to the maximum field angle of the panoramic lens. When the above conditional expression (3) is satisfied, the lens can be ensured to have a large imaging surface, and the total optical length and volume of the lens can be effectively controlled.
In some embodiments, the panoramic lens satisfies the conditional expression:
0.13<BFL/TTL <0.17；（4）
where BFL represents the optical back focus of the panoramic lens and TTL represents the optical total length of the panoramic lens. And (4) satisfies the conditional expression, and is beneficial to the assembly of the optical system.
In some embodiments, the panoramic lens satisfies the following conditional expression:
0.45< GT/TTL <0.55；（5）
where GT represents the sum of the total lens center thicknesses of the panoramic lens, and TTL represents the total optical length of the panoramic lens. When the GT/TTL value exceeds the lower limit, the lenses in the panoramic lens are too loose, and the relative position deviation of the assembled lenses is too large due to air expansion and cold contraction at high and low temperatures, so that the optimal image plane of the lens is deviated at the high and low temperatures, and the lens resolution drops too fast; when the value of GT/TTL exceeds the upper limit, the lenses of the panoramic lens are too compact, and the lenses cannot be well bent to correct aberration, so that the lens resolution cannot be improved.
In some embodiments, the panoramic lens satisfies the following conditional expression:
15<(R11+R12+R21+R22)/f<18；（6）
wherein R11 represents a radius of curvature of the first lens object-side surface, R12 represents a radius of curvature of the first lens image-side surface, R21 represents a radius of curvature of the second lens object-side surface, R22 represents a radius of curvature of the second lens image-side surface, and f represents an effective focal length of the panoramic lens. When the value of the conditional expression (6) exceeds the upper limit, the combined focal power of the first lens and the second lens is too strong, and the aim of quickly converging light rays can be achieved, so that the total optical length of the system can be reduced, but various aberrations generated by the system are too large to correct, meanwhile, the curvature of the lens is increased, the processing difficulty is increased, and the system error is increased; when the value of conditional expression (6) exceeds the lower limit, the combined power of the first lens and the second lens is reduced, and the above-described various aberrations are relatively reduced, but the refractive power thereof is reduced, resulting in an increase in the total optical length of the system.
In some embodiments, the panoramic lens satisfies the following conditional expression:
-0.32< (SAG 32 -SAG 31 )/CT 3 <0；（7）
wherein SAG 31 SAG representing the sagittal height of the third lens object side 32 Sagittal height representing image side of third lens, CT 3 The center thickness of the third lens is indicated. The surface type of the third lens can be reasonably controlled by meeting the condition (7), so that the third lens has a larger positive focal length, and the aberration of the system can be corrected.
In some embodiments, the panoramic lens satisfies the following conditional expression:
-0.1<φ 56 /φ<-0.04；（8）
wherein phi is 56 Represents the combined optical power of the fifth lens and the sixth lens, and phi represents the optical power of the panoramic lens. When phi is 56 The value of/phi exceeds the upper limit, the optical focal strength of the fifth lens and the sixth lens is too strong, and the aim of quickly converging light rays can be achieved, so that the total optical length of the system can be reduced, but various aberrations generated by the system are too large to correct, meanwhile, the curvature of the lens is increased, the processing difficulty is increased, and the system error is increased; when phi is 56 Value of/phi is exceededWhen the lower limit is exceeded, the combined power of the fifth lens and the sixth lens is reduced, and the above-mentioned various aberrations are relatively reduced, but the refractive power thereof is reduced, resulting in an increase in the total optical length of the system.
In some embodiments, the panoramic lens satisfies the following conditional expression:
-0.4mm<SAG 42 +SAG 72 <0；（9）
wherein SAG 42 SAG representing the sagittal height of the fourth lens image side 72 Representing the sagittal height of the seventh lens image side. The condition (9) is satisfied, the trend of the off-axis visual field light can be reasonably controlled, the aberration of the off-axis visual field and the central visual field can be reduced, and the resolution quality of the panoramic lens can be improved.
In some embodiments, the panoramic lens satisfies the following conditional expression:
190°<FOV<220°；（10）
wherein FOV represents the field angle of the panoramic lens. The condition (10) is satisfied, so that the panoramic lens can have a larger field angle and can be matched with the imaging requirement of a large target surface COMS chip.
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 panoramic 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.
In various embodiments of the present invention, when the lens in the panoramic lens is an aspherical lens, each aspherical surface type satisfies the following equation:
；
wherein z is an aspheric edgeWhen the optical axis direction is at the position with the height h, the distance from the aspheric peak is sagittal height, c is the paraxial curvature of the surface, A 2i The aspherical surface profile coefficient of the 2 i-th order is represented by k, wherein k is a conic coefficient conic, the surface profile curve is a hyperbola when k is smaller than-1, a parabola when k is equal to-1, an ellipse when k is between-1 and 0, a circle when k is equal to 0, and an oblate when k is larger than 0. The above parameters can accurately set the surface shape size of the aspheric surfaces of the front and back surfaces of the lens. The aspherical shape satisfies an even aspherical equation, and different aspherical coefficients are utilized to maximize the effect of the aspherical surface in the system, so as to obtain more perfect resolution.
First embodiment
Referring to fig. 1, a schematic structural diagram of a panoramic lens 100 according to a first embodiment of the present invention is shown, where the panoramic lens 100 includes, in order from an object side to an imaging plane along an optical axis: the first lens L1, the second lens L2, the third lens L3, the stop ST, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1, and the optical centers of the respective lenses are on the same straight line.
The first lens element L1 has negative focal 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 convex surface, and the image side surface S4 of the second lens is a concave surface;
the third lens element L3 with positive refractive power has a concave object-side surface S5 and a convex image-side surface S6;
the fourth lens element L4 has positive refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is convex;
the fifth lens L5 has negative focal power, and an object side surface S9 and an image side surface of the fifth lens are concave surfaces;
the sixth lens L6 has positive focal power, the object side surface and the image side surface S11 of the sixth lens are both convex surfaces, the sixth lens L6 and the fifth lens L5 form a cementing body, and the cementing surface of the cementing body is S10;
the seventh lens element L7 with positive refractive power has a convex object-side surface S12 and a convex image-side surface S13 at a paraxial region, and the image-side surface S13 of the seventh lens element has an inflection point.
The object side surface of the filter G1 is S14, and the image side surface of the filter G1 is S15.
The imaging surface of the panoramic lens 100 is S16.
The first lens L1, the third lens L3, the fifth lens L5 and the sixth lens L6 are all glass spherical lenses, and the second lens L2, the fourth lens L4 and the seventh lens L7 are all glass aspherical lenses.
The parameters related to each lens of the panoramic lens 100 provided in this embodiment are shown in table 1.
TABLE 1
The parameters of the aspherical lens of the panoramic lens 100 in the present embodiment are shown in table 2.
TABLE 2
Referring to fig. 2, an MTF diagram of the panoramic lens 100 in the present embodiment is shown, and it can be seen from the diagram that the MTF value of the lens within 0.9 field of view is above 0.4 at a spatial frequency of 200lp/mm, which indicates that the panoramic lens 100 has a higher resolution.
Referring to fig. 3, an F-Theta distortion chart of the panoramic lens 100 in the present embodiment is shown, and it can be seen from the chart that the F-Theta distortion of the lens is small and within ±5%, which indicates that the distortion of the panoramic lens 100 is well corrected.
Referring to fig. 4, an on-axis spherical aberration curve chart of the panoramic lens 100 in the present embodiment is shown, and it can be seen from the figure that the offset of the on-axis spherical aberration is controlled within ±0.04 mm, which illustrates that the panoramic lens 100 can effectively correct the on-axis spherical aberration.
Second embodiment
Referring to fig. 5, a schematic structural diagram of a panoramic lens 200 provided in the present embodiment is shown, in which the panoramic lens 200 in the present embodiment is substantially identical to the surface type concave-convex of a part of lenses of the panoramic lens 100 in the first embodiment, and the difference is that: the object-side surface S5 of the third lens element L3 in the panoramic lens 200 is convex, the image-side surface S6 is concave, the image-side surface S8 of the fourth lens element L4 is convex at a paraxial region and has a inflection point, and the curvature radius, thickness and air interval of each lens element are different. The parameters of the panoramic lens 200 of the present embodiment are shown in table 3.
TABLE 3 Table 3
The parameters of the aspherical lens of the panoramic lens 200 in the present embodiment are shown in table 4.
TABLE 4 Table 4
Referring to fig. 6, an MTF diagram of the panoramic lens 200 in the present embodiment is shown, and the MTF value of the lens within 0.9 field of view at a spatial frequency of 200lp/mm is above 0.4, which indicates that the panoramic lens 200 has a higher resolution.
Referring to fig. 7, an F-Theta distortion diagram of the panoramic lens 200 in the present embodiment is shown, and it can be seen from the diagram that the F-Theta distortion of the lens is small and within ±6%, which indicates that the distortion of the panoramic lens 200 is well corrected.
Referring to fig. 8, an on-axis spherical aberration curve chart of the panoramic lens 200 in the present embodiment is shown, and it can be seen from the figure that the offset of the on-axis spherical aberration is controlled within ±0.02 mm, which illustrates that the panoramic lens 200 can effectively correct the on-axis spherical aberration.
Third embodiment
Referring to fig. 9, a schematic structural diagram of a panoramic lens 300 provided in the present embodiment is shown, in which the panoramic lens 300 in the present embodiment is substantially identical to the surface type concave-convex of a part of lenses of the panoramic lens 100 in the first embodiment, and the difference is that: in the panoramic lens 300, the object-side surface S5 of the third lens element L3 is convex, the image-side surface S6 is convex, the image-side surface S8 of the fourth lens element L4 is concave, and the curvature radius, thickness and air gap between the lens elements are different. The parameters of the panoramic lens 300 of this embodiment are shown in table 5.
TABLE 5
The parameters of the aspherical lens of the panoramic lens 300 in this embodiment are shown in table 6.
TABLE 6
Referring to fig. 9, an MTF diagram of the panoramic lens 300 in the present embodiment is shown, and the MTF value of the lens within 0.9 field of view is above 0.4 at a spatial frequency of 200lp/mm, which indicates that the panoramic lens 300 has a higher resolution.
Referring to fig. 10, an F-Theta distortion diagram of the panoramic lens 300 in the present embodiment is shown, and it can be seen from the diagram that the F-Theta distortion of the lens is small and within ±5%, which indicates that the distortion of the panoramic lens 300 is well corrected.
Referring to fig. 12, an on-axis spherical aberration curve of the panoramic lens 300 is shown, and it can be seen from the figure that the offset of the on-axis spherical aberration is controlled within ±0.01 mm, which illustrates that the panoramic lens 300 can effectively correct the on-axis spherical aberration.
Referring to table 7, the optical characteristics corresponding to the panoramic lens provided by the above three embodiments include the total optical length TTL, the f# and the effective focal length F of the panoramic lens, and also include the relevant values corresponding to each of the above conditional expressions.
TABLE 7
In summary, the panoramic lens and the imaging device provided by the invention adopt a mixed and matched structure of the spherical glass lens and the glass aspheric lens, so that aberration is effectively corrected to a certain extent; the arrangement among the lenses is compact, so that the length of the lens is effectively reduced; the diaphragm and each lens structure of the lens are reasonably arranged, so that the light quantity in a larger range can enter the body, and the imaging requirement of a bright and dark environment is met.
Fourth embodiment
Referring to fig. 13, an imaging apparatus 400 according to a fourth embodiment of the present invention is shown, where the imaging apparatus 400 may include an imaging element 410 and a panoramic lens (e.g., panoramic lens 100) according to any of the above embodiments. The imaging element 410 may be a CMOS (Complementary Metal Oxide Semiconductor ) image sensor or a CCD (Charge Coupled Device, charge coupled device) image sensor.
The imaging device 400 may be an unmanned plane, a motion camera, a security device, a smart phone, or any other electronic device loaded with the panoramic lens.
The imaging apparatus 400 provided in the present embodiment includes the panoramic lens 100, and since the panoramic lens 100 has the advantages of a large aperture, a high resolution, and an ultra-large wide angle, the imaging apparatus 400 having the panoramic lens 100 also has the advantages of a large aperture, a high resolution, and an ultra-large wide angle.
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 foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the 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. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (13)
1. A panoramic lens, characterized by comprising, in order from an object side to an imaging plane along an optical axis:
a first lens with negative focal power, 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;
a second lens with negative focal power, wherein 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;
a third lens having positive optical power;
a diaphragm;
a fourth lens with positive focal power, wherein the object side surface of the fourth lens is a convex surface;
a fifth lens with negative focal power, wherein an object side surface and an image side surface of the fifth lens are concave surfaces;
a sixth lens having positive optical power, an object side surface and an image side surface of the sixth lens being convex, and the fifth lens and the sixth lens forming a cemented body;
a seventh lens element with positive refractive power having a convex object-side surface, a convex image-side surface at a paraxial region, and an inflection point;
the panoramic lens comprises at least one glass spherical lens and at least one glass aspherical lens;
the panoramic lens satisfies the following conditional expression:
0.5< f/SD ST <1；
wherein f represents the effective focal length of the panoramic lens, SD ST Representing the maximum aperture of the diaphragm;
the panoramic lens satisfies the following conditional expression:
4.5mm<IH<5.6mm；
IH represents the image height corresponding to the maximum field angle of the panoramic lens.
2. The panoramic lens of claim 1, wherein the panoramic lens satisfies the following conditional expression:
3<TTL/IH<3.5；
wherein TTL represents the total optical length of the panoramic lens, and IH represents the image height corresponding to the maximum field angle of the panoramic lens.
3. The panoramic lens of claim 1, wherein the panoramic lens satisfies the following conditional expression:
0.13<BFL/TTL <0.17；
wherein BFL represents the optical back focus of the panoramic lens, and TTL represents the total optical length of the panoramic lens.
4. The panoramic lens of claim 1, wherein the panoramic lens satisfies the following conditional expression:
0.45< GT/TTL <0.55；
wherein GT represents the sum of the thicknesses of all lens centers of the panoramic lens, and TTL represents the total optical length of the panoramic lens.
5. The panoramic lens of claim 1, wherein the panoramic lens satisfies the following conditional expression:
15<(R 11 +R 12 +R 21 +R 22 )/f<18；
wherein R is 11 Representing the radius of curvature of the object-side surface of the first lens, R 12 Representation ofThe curvature radius of the image side surface of the first lens, R 21 Representing the radius of curvature of the object-side surface of the second lens, R 22 Representing the radius of curvature of the image side surface of the second lens, and f represents the effective focal length of the panoramic lens.
6. The panoramic lens of claim 1, wherein the panoramic lens satisfies the following conditional expression:
-0.32< (SAG 32 -SAG 31 )/CT 3 <0；
wherein SAG 31 Representing the sagittal height of the object side of the third lens, SAG 32 Representing the sagittal height of the image side of the third lens, CT 3 Representing the center thickness of the third lens.
7. The panoramic lens of claim 1, wherein the panoramic lens satisfies the following conditional expression:
-0.1<φ 56 /φ<-0.04；
wherein phi is 56 Represents the combined optical power of the fifth lens and the sixth lens, and phi represents the optical power of the panoramic lens.
8. The panoramic lens of claim 1, wherein the panoramic lens satisfies the following conditional expression:
-0.4mm<SAG 42 +SAG 72 <0；
wherein SAG 42 Representing the sagittal height of the fourth lens image side, SAG 72 Representing the sagittal height of the seventh lens image side.
9. The panoramic lens of claim 1, wherein an object side of the third lens is concave and an image side of the third lens is convex.
10. The panoramic lens of claim 1, wherein an object side of the third lens is convex and an image side of the third lens is concave.
11. The panoramic lens of claim 1, wherein an object side of the third lens is convex and an image side of the third lens is convex.
12. The panoramic lens of claim 1, wherein the first lens, the third lens, the fifth lens, and the sixth lens are all glass spherical lenses, and the second lens, the fourth lens, and the seventh lens are all glass aspherical lenses.
13. An imaging device comprising a panoramic lens as recited in any one of claims 1-12 and an imaging element for converting an optical image formed by the panoramic lens into an electrical signal.
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