CN115097611B - Large-aperture lens with circular view and panoramic camera system - Google Patents
Large-aperture lens with circular view and panoramic camera system Download PDFInfo
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- CN115097611B CN115097611B CN202210852551.5A CN202210852551A CN115097611B CN 115097611 B CN115097611 B CN 115097611B CN 202210852551 A CN202210852551 A CN 202210852551A CN 115097611 B CN115097611 B CN 115097611B
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- 230000003287 optical effect Effects 0.000 claims abstract description 75
- 238000003384 imaging method Methods 0.000 claims abstract description 35
- 238000002834 transmittance Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005286 illumination Methods 0.000 abstract description 3
- 238000012634 optical imaging Methods 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 description 18
- 230000014509 gene expression Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
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- 239000006059 cover glass Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000005499 meniscus Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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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
- G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
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Abstract
The application relates to the technical field of optical imaging, in particular to a panoramic large aperture lens and a panoramic camera system. The large aperture lens includes first to eighth lenses disposed in order from an object side to an imaging plane, and the first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has positive optical power, the sixth lens has negative optical power, the seventh lens has positive optical power, and the eighth lens has positive optical power. Through reasonable collocation of focal power combinations of the lenses, the effects of good temperature control, high illumination and good chip compatibility are achieved.
Description
Technical Field
The application relates to the technical field of optical imaging, in particular to a panoramic large aperture lens and a panoramic camera system.
Background
In recent years, with the rapid development of the industries of high-definition cameras and vehicle-mounted modules, the demands of the looking-around modules are increasing, but the problems of too small aperture, poor temperature control and low resolution quality of the conventional looking-around modules generally exist at present, and particularly under dark environments such as at night, the incident luminous flux is too small, so that the signal to noise ratio is too small to meet the demands of use, and therefore, the looking-around large aperture lens is urgently needed.
The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore may contain information that does not form any part of the prior art nor that does it form the prior art that may teach one of ordinary skill in the art.
Disclosure of Invention
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The invention aims to provide a wide-aperture lens with good temperature control, high illumination and good chip compatibility and a panoramic shooting system.
A first aspect of the present invention provides a wide-aperture lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens;
the first lens to the eighth lens are sequentially arranged along the direction from the object side of the circular large aperture lens to the imaging surface;
the first lens has negative optical power;
the second lens has negative optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has positive optical power, the sixth lens has negative optical power, the seventh lens has positive optical power, and the eighth lens has positive optical power.
Further, an object side surface of the first lens is convex along an optical axis of the ring-view large aperture lens, and an image side surface of the first lens is concave along the optical axis;
the object side surface and the image side surface of the second lens are concave along the optical axis;
the object side surface and the image side surface of the third lens are both convex along the optical axis;
the object side surface and the image side surface of the fourth lens are both convex along the optical axis;
an object-side surface of the fifth lens is concave along the optical axis, and an image-side surface of the fifth lens is convex along the optical axis;
the object side surface and the image side surface of the sixth lens are concave along the optical axis;
the object side surface and the image side surface of the seventh lens are both convex along the optical axis;
an object-side surface of the eighth lens is concave along the optical axis, and an image-side surface of the fifth lens is convex along the optical axis.
Further, the wide-aperture lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.
Further, a visible light filter is arranged on one side of the image side surface of the eighth lens;
and/or the object side surface of the fifth lens is plated with a visible light filter film layer.
Further, the wide-aperture lens satisfies: 2 theta >195 deg., 1.2< f# <1.6;
wherein 2 theta represents the full field angle of the wide-aperture lens, and F# represents the F number of the wide-aperture lens.
Further, wherein T L And h represents the image plane height of the wide-aperture lens.
Further, the wide-aperture lens satisfies: -1 < phi 123 /φ＜0；
Wherein phi is 123 Representing the combined optical power of the first, second and third lenses.
Further, the wide-aperture lens satisfies: phi is 0.1 < 45 /φ＜0.4；
Wherein phi is 45 Representing the combined optical power of the fourth lens and the fifth lens.
Further, the wide-aperture lens satisfies: phi is 0 < 678 /φ＜0.1；
Wherein phi is 678 Representing the combined optical power of the sixth lens, the seventh lens, and the eighth lens.
Further, the wide-aperture lens satisfies: SD1/h is less than 2;
wherein SD1 represents the half aperture of the first lens, and h represents the image plane height of the wide-aperture lens.
Further, the wide-aperture lens satisfies: v5>60, R16 < -50, 15 DEG < CRA < 25 DEG;
where V5 represents an abbe number of the fifth lens, R16 represents a radius of curvature of an image-side surface of the eighth lens, and CRA represents a chief ray angle of the wide-aperture lens.
Further, the wide-aperture lens satisfies: (v5+v7)/V6 >5, (R7-R10)/R8 < -0.5;
wherein V5 represents the abbe number of the fifth lens, V6 represents the abbe number of the sixth lens, and V7 represents the abbe number of the seventh lens;
r7 represents a radius of curvature of an object side surface of the fourth lens, R8 represents a radius of curvature of an image side surface of the fourth lens, and R10 represents a radius of curvature of an image side surface of the fifth lens.
Further, the wide-aperture lens satisfies: (R4+R5)/R5 <1.5, Δh90°/Δh0° >0.75;
wherein R4 represents a radius of curvature of an image-side surface of the second lens, and R5 represents a radius of curvature of an object-side surface of the third lens;
Δh0° represents an imaging size at an angle of view of 0 ° to 1 °, and Δh90° represents an imaging size at an angle of view of 89 ° to 90 °.
Further, the diaphragm is filter paper with a light passing hole in the center;
and the object side surfaces and the image side surfaces of the first lens and the eighth lens are respectively plated with a multilayer film with high transmittance.
A second aspect of the present invention provides a panoramic imaging system, including two groups of the above-mentioned wide-aperture lenses, where the two groups of wide-aperture lenses are arranged in a central symmetry manner.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a large aperture lens with circular view, which comprises a first lens, a second lens and an eighth lens, wherein the first lens, the second lens and the eighth lens are sequentially arranged from an object space to an imaging surface, the first lens has negative focal power, the second lens has negative focal power, the third lens has positive power, the fourth lens has positive power, the fifth lens has positive power, the sixth lens has negative power, the seventh lens has positive power, and the eighth lens has positive power. Through reasonable collocation of focal power combinations of the lenses, the effects of good temperature control, high illumination and good chip compatibility are achieved.
The invention also provides a panoramic camera system which comprises the wide-aperture lens, so that the panoramic camera system also has the beneficial effect of the wide-aperture lens.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is an imaging schematic diagram of a wide-aperture lens according to an embodiment of the present invention;
FIG. 2 is a defocus graph of a large aperture lens according to an embodiment of the present invention;
FIG. 3 is a graph illustrating the MTF of a large aperture lens for round-robin according to an embodiment of the present invention;
FIG. 4 is a graph of illuminance for a large aperture lens according to an embodiment of the present invention;
FIG. 5 is a graph of chief ray angles for a wide-aperture lens provided by an embodiment of the present invention;
fig. 6 is an image spot size diagram of a wide-aperture lens according to an embodiment of the present invention.
Reference numerals:
1-first lens, 2-second lens, 3-third lens, 4-fourth lens, 5-fifth lens, 6-sixth lens, 7-seventh lens, 8-eighth lens, 9-visible light filter, 10-cover glass, 11-imaging plane.
Detailed Description
The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various alterations, modifications and equivalents of the methods, devices and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but rather, obvious variations may be made upon an understanding of the present disclosure, other than operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.
The features described herein may be embodied in different forms and are not to be construed as limited to the examples described herein. Rather, the examples described herein have been provided solely to illustrate some of the many possible ways in which the methods, apparatuses, and/or systems described herein may be implemented that will be apparent after a review of the disclosure of the present application.
The first aspect of the present application provides a wide-aperture lens, as shown in fig. 1, where the wide-aperture lens includes eight lenses, and the eight lenses are sequentially a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8, which are sequentially disposed along a direction from an object side of the wide-aperture lens to an imaging plane 11.
Wherein the first lens 1 has a negative optical power, the first lens 1 is a meniscus lens with a concave surface facing the imaging surface 11, i.e. the object side surface of the first lens 1 is convex along the optical axis, and the image side surface of the first lens 1 is concave along the optical axis. The second lens 2 has a negative optical power, and the second lens 2 is a biconcave lens, i.e. both the object-side surface and the image-side surface of the second lens 2 are concave along the optical axis. The third lens 3 has positive optical power, and the third lens 3 is a biconvex lens, i.e., both the object side surface and the image side surface of the third lens 3 are convex along the optical axis.
The fourth lens 4 has positive optical power, and the fourth lens 4 is a biconvex lens, i.e., both the object side surface and the image side surface of the fourth lens 4 are convex along the optical axis. The fifth lens 5 has positive optical power, and the fifth lens 5 is a meniscus lens with its convex surface facing the imaging surface 11, i.e., the object-side surface of the fifth lens 5 is concave along the optical axis, and the image-side surface of the fifth lens 5 is convex along the optical axis. The fourth lens 4 and the fifth lens 5 mainly bear the optical power of the wide-aperture lens.
The sixth lens 6 has negative optical power, and the sixth lens 6 is a biconcave lens, i.e., both the object-side surface and the image-side surface of the sixth lens 6 are concave along the optical axis. The seventh lens 7 has positive optical power, the seventh lens 7 is a biconvex lens, that is, both the object side surface and the image side surface of the third lens 3 are convex along the optical axis, and the sixth lens 6 and the seventh lens 7 constitute a cemented lens group.
The eighth lens 8 has positive optical power, and the eighth lens 8 is a meniscus lens with its convex surface facing the imaging surface 11, i.e., the object-side surface of the eighth lens 8 is concave along the optical axis, and the image-side surface of the eighth lens 8 is convex along the optical axis; the lens with the shape can well control the angle of the principal ray of the wide-aperture lens while correcting aberration.
Meanwhile, the first lens 1, the third lens 3, the fourth lens 4, the sixth lens 6 and the seventh lens 7 are glass spherical lenses, and the second lens 2, the fifth lens 5 and the eighth lens 8 are glass aspherical lenses; any aspherical surface of the second lens 2, the fifth lens 5, and the eighth lens 8 can be expressed by equation 1:
wherein z is the sagittal height of the aspherical surface, c is the paraxial curvature of the aspherical surface, h is the effective radius value of the corresponding surface of the lens, K is the quadric surface coefficient, and B-E is the higher order term coefficient of the aspherical surface.
Meanwhile, the surfaces of two sides of the eight lenses can be plated with high-transmittance multilayer films; meanwhile, the fifth lens 5 is made of a low-dispersion glass material.
In some embodiments, the ring-looking large aperture lens may further include a diaphragm to precisely adjust the amount of light passing through the diaphragm. For example, the aperture stop is arranged between the third lens 3 and the fourth lens 4, and the aperture stop is arranged at the position, so that the incidence angle of the chief ray reaching the imaging surface 11 can be controlled advantageously, and the angle can be effectively controlled to be 5+/-3 degrees, thereby more meeting the incidence requirement of a chip looking around a large aperture lens.
Preferably, the diaphragm can adopt light shielding paper with a light transmission hole in the center, and the light shielding paper is used as the diaphragm, so that the requirement on the light transmission hole of the lens barrel of the circular large aperture lens can be reduced to a certain extent, the processing accuracy is ensured to the greatest extent, and the processing error is reduced.
In some embodiments, the ring-looking large aperture lens may further include a visible light filter 9 and a cover glass 10; a visible light filter 9 and a cover glass 10 are sequentially provided on the image side of the eighth lens 8; the visible light filter 9 can inhibit light transmission of a non-working wave band, so that chromatic aberration and stray light of the wide-aperture lens are effectively reduced, and an imaging effect is improved.
In this embodiment, a filter of 0.3mm may be used as the visible light filter 9. It can be understood that the thickness of the visible light filter 9 is not limited to this, and the visible light filter 9 may be removed, and a visible light filter layer may be plated on the object side surface of the fifth lens 5.
The second aspect of the present application further provides a panoramic imaging system, where the panoramic imaging system includes two groups of the large aperture lenses of the first aspect, and the two groups of large aperture lenses of the first aspect are arranged in a central symmetry manner.
The wide-aperture lens and the panoramic camera system can meet the following conditional expressions:
in some embodiments, 2θ >195 ° is satisfied;
in some embodiments, 1.2< f# <1.6 is satisfied;
in some embodiments, satisfy 2<T L /h<5；
In some embodiments, -1 < phi is satisfied 123 /φ＜0；
In some embodiments, 0.1 < φ is satisfied 45 /φ＜0.4；
In some embodiments, 0 < φ is satisfied 678 /φ＜0.1；
In some embodiments, SD1/h < 2 is satisfied;
in some embodiments, V5>60 is satisfied;
in some embodiments, R16 < -50 is satisfied;
in some embodiments, 15 ° < CRA < 25 °;
in some embodiments, (v5+v7)/V6 >5 is satisfied;
in some embodiments, (R7-R10)/R8 < -0.5;
in some embodiments, (r4+r5)/R5 <1.5 is satisfied;
in some embodiments, Δh90 °/Δh0° >0.75 is satisfied.
In the above expression, 2θ represents the full field angle of the wide-aperture lens, f# represents the F-number of the wide-aperture lens, T L The optical total length of the wide-aperture lens is represented, h represents the image plane height of the wide-aperture lens, phi 123 Represents the combined optical power of the first lens, the second lens and the third lens, phi 45 Represents the combined optical power of the fourth lens and the fifth lens, phi 678 The combined power of the sixth lens, the seventh lens, and the eighth lens is represented by SD1, the half-caliber of the first lens, V5, the abbe number of the fifth lens, R16, the radius of curvature of the image side surface of the eighth lens, CRA, the chief ray angle of the ring-vision large aperture lens, V6, the abbe number of the sixth lens, V7, the abbe number of the seventh lens, R7, the radius of curvature of the object side surface of the fourth lens, R8, the radius of curvature of the image side surface of the fourth lens, R10, the radius of curvature of the image side surface of the fifth lens, R4, the radius of curvature of the image side surface of the second lens, R5, the radius of curvature of the object side surface of the third lens, Δh0° the imaging size at 0 ° to 1 ° angle of view, Δh90° the imaging size at 89 ° to 90 ° angle of view.
In the present application, the optical total length, the image plane height, the half-diameter of the lens, the radius of curvature, and the imaging size of the lens are expressed in millimeters (mm).
According to the above conditional expression, at least the following technical effects can be achieved:
according to 2 theta >195 DEG and 1.2< F# <1.6, at least the circular large aperture lens can be ensured to have enough good imaging quality; when the f# exceeds the upper limit, the correctable aberration remaining amount of the whole lens is excessive; when the aperture stop f# is lower than the lower limit, the aberration of the whole lens is excessive, and the imaging quality is poor.
Furthermore, according to 2<T L /h<And 5, limiting the total length of the ring-looking large aperture lens while ensuring enough good imaging quality. When the TL/h value exceeds the upper limit, the total length of the whole lens is too long, or if the total length is shortened, the image height is insufficient; when the value TL/(h/2) is lower than the lower limit, correction of lens aberrations is difficult due to excessive optical power of each lens, and resolution is significantly lowered.
Furthermore, according to-1 < phi 123 The phi is less than 0, so that the wide-aperture lens with enough good imaging quality can be at least ensured; the front three lenses, namely the first lens, the second lens and the third lens form a front lens group of the large aperture lens, and the front lens group mainly acts in the large aperture lens to collect object plane light with a wide field angle into the lens, notify F-Theta distortion of the correction lens and generate no larger aberration. When the value of phi 123/phi exceeds the upper limit, the combined focal power of the front lens group is too strong, and the total length of the lens can be reduced, but the spherical aberration generated by the lens is too large and is difficult to correct; when the value of phi 123/phi exceeds the lower limit, the front lens group power decreases and the spherical aberration relatively decreases, but the refractive power thereof decreases, resulting in an increase in the overall lens length.
Furthermore, according to 0.1 < phi 45 The phi is less than 0.4, and at least the wide-aperture lens with enough good imaging quality can be ensured; the fourth lens and the fifth lens form a middle lens group of the circular large aperture lens, and the combined focal power of the middle lens group is connected with the front lens group, so that the front lens group is effectively matched. The whole shape of the middle lens group is of a symmetrical two-piece structure, and the tasks of bearing the whole focal power and correcting the vertical aberration are mainly completed in the wide-aperture lens. When phi is 45 When the value of/phi exceeds the upper limit, the optical power of the intermediate lens group is too high, and the total lens length can be reduced, but the spherical aberration generated by the lens group,Astigmatism and field curvature are too large to correct; when phi is 45 When the value of/phi is below the lower limit, the optical power of the middle lens group is reduced, the aberration is relatively reduced, but the refractive power is reduced, resulting in an overall longer lens length.
Furthermore, according to 0 < phi 678 The phi is less than 0.1, and at least the wide-aperture lens with enough good imaging quality can be ensured; the rear three lenses, namely the sixth lens, the seventh lens and the eighth lens form a rear lens group of the large aperture lens, and the combined focal power of the rear lens group is connected with the middle lens group, so that the aberration can be effectively improved, and the imaging quality can be improved. When phi is 678 The value of/phi exceeds the upper limit, and the aberration correction capability of the rear lens group is lowered.
Furthermore, according to SD1/h < 2, at least a suitable lens size can be provided while well correcting aberrations. SD1 is the half caliber of the first lens, and the first lens mainly plays a role in light collection in the wide aperture lens, and the larger the outer diameter is, the better the light collection effect is, but the size of the whole lens is increased. When SD1/h is smaller than 2, the lens can be guaranteed to have good light receiving effect, and meanwhile the overall size of the lens is guaranteed.
In addition, according to V5>60, R16 < -50, 15 < CRA < 25, at least the chief ray angle of the whole lens can be well controlled. V5 is Abbe number of the fifth lens, R16 is curvature radius of the image side surface of the eighth lens, and the function of the fifth lens is to correct aberration and change the chief ray angle of the lens as much as possible, so as to ensure the chief ray angle in the above range, increase the chip compatibility of the lens and increase the optional chip types.
Furthermore, according to (V5+V7)/V6 >5, (R7-R10)/R8 < -0.5, it is at least possible to ensure that the wide-aperture lens is seen around with a sufficiently good night imaging quality. When the above relation is satisfied, the intermediate lens group can provide the focal power of the whole optical lens, and can well complete the day-night confocal function, and can well correct the optical aberration.
In addition, according to (R4+R5)/R5 <1.5, Δh90 DEG/Δh0 DEG >0.75, the wide-aperture lens with good F-Theta distortion and good compression ratio of the image plane edge view field to the center view field can be at least ensured, so that the imaging proportion of the lens is similar to the actual proportion of an object existing objectively.
Next, a wide-aperture lens according to an example will be described.
TABLE 1
TABLE 2
In tables 1 and 2, S1 and S2 represent the object side surface and the image side surface of the first lens, respectively, S3 and S4 represent the object side surface and the image side surface of the second lens, respectively, and so on.
TABLE 3 Table 3
In table 3, f represents the focal length of the wide-aperture lens, and RI represents the illuminance of the wide-aperture lens.
Fig. 2 shows the defocus curve of the example ring-looking large-aperture lens, fig. 3 shows the MTF curve of the example ring-looking large-aperture lens, fig. 4 shows the illuminance curve of the example ring-looking large-aperture lens, fig. 5 shows the chief ray angle curve of the example ring-looking large-aperture lens, and fig. 6 shows the imaging point size of the example ring-looking large-aperture lens. Table 1 presents characteristics of lenses of the example ring-looking large aperture lens, table 2 presents aspherical characteristics of lenses of the example ring-looking large aperture lens, and table 3 presents values of conditional expressions of the optical lens according to the example.
According to the above example, the five spherical lenses and the three aspherical lenses are adopted to be matched and mixed for use, so that the wide-aperture lens has higher service life and stability; meanwhile, the aberration of the lens can be effectively corrected, and the lens has the advantage of small focal drift generated at high and low temperatures, can be suitable for different temperature occasions, and has good temperature control; meanwhile, through reasonably matching the focal power of each lens, the lens can reach an oversized field angle of more than 200 degrees, wherein three aspheric lenses can effectively improve the imaging quality of the whole lens, and the optical total length of the whole lens can be reduced as much as possible so as to ensure that images with high imaging quality can be shot in a darker environment; meanwhile, the angle of the principal ray can be well controlled by enabling the eighth lens to be an aspheric lens, so that the principal ray can be perfectly matched with the sensor chip, and the chip compatibility is improved; meanwhile, the image height ratio of the unit angle of the central view field and the unit angle of the edge view field of the wide-aperture lens can be not less than 0.75, and the imaging ratio of the lens is similar to the actual ratio of the objectively existing object.
While this disclosure includes particular examples, it will be apparent from an understanding of the disclosure of the present application that various changes in form and details can be made therein without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in descriptive sense only and not for purposes of limitation. The description of features or aspects in each example will be considered applicable to similar features or aspects in other examples. Suitable results may be obtained if the described techniques are performed in a different order and/or if components in the described systems, frameworks, devices or circuits are combined in a different manner and/or replaced or supplemented by other components or their equivalents. Thus, the scope of the disclosure is not to be limited by the specific embodiments, but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents are to be interpreted as being included in the disclosure.
Claims (11)
1. The large-aperture lens for all-around vision is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens;
the first lens to the eighth lens are sequentially arranged along the direction from the object side of the circular large aperture lens to the imaging surface;
the first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, the fourth lens has positive focal power, the fifth lens has positive focal power, the sixth lens has negative focal power, the seventh lens has positive focal power, and the eighth lens has positive focal power;
an object-side surface of the first lens is convex along an optical axis of the ring-looking large aperture lens, and an image-side surface of the first lens is concave along the optical axis;
the object side surface and the image side surface of the second lens are concave along the optical axis;
the object side surface and the image side surface of the third lens are both convex along the optical axis;
the object side surface and the image side surface of the fourth lens are both convex along the optical axis;
an object-side surface of the fifth lens is concave along the optical axis, and an image-side surface of the fifth lens is convex along the optical axis;
the object side surface and the image side surface of the sixth lens are concave along the optical axis;
the object side surface and the image side surface of the seventh lens are both convex along the optical axis;
an object-side surface of the eighth lens is concave along the optical axis, and an image-side surface of the eighth lens is convex along the optical axis;
the wide-aperture lens satisfies the following conditions: -1 < phi 123 /φ＜0，0.1＜φ 45 /φ＜0.4，0＜φ 678 /φ＜0.1；
Wherein phi is 123 Representing a combined optical power of the first lens, the second lens, and the third lens, wherein φ 45 Represents the combined optical power of the fourth lens and the fifth lens, phi 678 And represents the combined focal power of the sixth lens, the seventh lens and the eighth lens, and phi is the focal power of the ring-view large aperture lens.
2. The wide-aperture lens of claim 1, further comprising a stop disposed between the third lens and the fourth lens.
3. The wide-aperture lens of claim 2, wherein the diaphragm is a filter paper with a light-passing hole in the center;
and the object side surfaces and the image side surfaces of the first lens and the eighth lens are respectively plated with a multilayer film with high transmittance.
4. The wide-aperture lens as set forth in claim 1, wherein a visible light filter is provided on one side of the image side surface of the eighth lens; and/or the number of the groups of groups,
and a visible light filter film layer is plated on the object side surface of the fifth lens.
5. The wide-aperture lens of any one of claims 1-4, wherein the wide-aperture lens satisfies: 200 DEG is more than or equal to 2 theta is more than 195 DEG, 1.2< F# <1.6;
wherein 2 theta represents the full field angle of the wide-aperture lens, and F# represents the F number of the wide-aperture lens.
6. The wide-aperture lens of any one of claims 1-4, wherein the wide-aperture lens satisfies: 2<T L /h<5；
Wherein T is L Indicating the total optical length of the wide-aperture lens, and h indicating the wide-aperture lensImage plane height.
7. The wide-aperture lens of any one of claims 1-4, wherein the wide-aperture lens satisfies: SD1/h is less than 2;
wherein SD1 represents the half aperture of the first lens, and h represents the image plane height of the wide-aperture lens.
8. The wide-aperture lens of any one of claims 1-4, wherein the wide-aperture lens satisfies: 70.40 More than or equal to V5>60, and less than CRA (CRA) of 15 degrees and less than 25 degrees;
wherein V5 represents the abbe number of the fifth lens, CRA represents the chief ray angle of the ring-view large aperture lens.
9. The wide-aperture lens of any one of claims 1-4, wherein the wide-aperture lens satisfies: 5.87 More than or equal to (V5+V7)/V6 >5;
wherein V5 represents the abbe number of the fifth lens, V6 represents the abbe number of the sixth lens, and V7 represents the abbe number of the seventh lens.
10. The wide-aperture lens of any one of claims 1-4, wherein the wide-aperture lens satisfies: (R4+R5)/R5 <1.5,0.77 > Δh90 DEG/Δh0 DEG >0.75;
wherein R4 represents a radius of curvature of an image-side surface of the second lens, and R5 represents a radius of curvature of an object-side surface of the third lens;
Δh0° represents an imaging size at an angle of view of 0 ° to 1 °, and Δh90° represents an imaging size at an angle of view of 89 ° to 90 °.
11. A panoramic camera system comprising two groups of the wide-aperture lens of any one of claims 1 to 10, wherein the two groups of the wide-aperture lens are arranged in central symmetry.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262022A (en) * | 2019-06-20 | 2019-09-20 | 东莞市宇瞳光学科技股份有限公司 | A kind of zoom lens |
| CN110333593A (en) * | 2019-08-12 | 2019-10-15 | 舜宇光学(中山)有限公司 | Low distorted optical system |
| CN216210199U (en) * | 2021-11-05 | 2022-04-05 | 厦门力鼎光电股份有限公司 | Wide-angle imaging lens for video conference and network live broadcast |
| CN114675404A (en) * | 2022-05-27 | 2022-06-28 | 江西联创电子有限公司 | Optical lens |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262022A (en) * | 2019-06-20 | 2019-09-20 | 东莞市宇瞳光学科技股份有限公司 | A kind of zoom lens |
| CN110333593A (en) * | 2019-08-12 | 2019-10-15 | 舜宇光学(中山)有限公司 | Low distorted optical system |
| CN216210199U (en) * | 2021-11-05 | 2022-04-05 | 厦门力鼎光电股份有限公司 | Wide-angle imaging lens for video conference and network live broadcast |
| CN114675404A (en) * | 2022-05-27 | 2022-06-28 | 江西联创电子有限公司 | Optical lens |
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