CN116609927A - Fish-eye lens - Google Patents

Fish-eye lens Download PDF

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Publication number
CN116609927A
CN116609927A CN202310473353.2A CN202310473353A CN116609927A CN 116609927 A CN116609927 A CN 116609927A CN 202310473353 A CN202310473353 A CN 202310473353A CN 116609927 A CN116609927 A CN 116609927A
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China
Prior art keywords
lens
focal length
convex
image
effective focal
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CN202310473353.2A
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Chinese (zh)
Inventor
陶雪
曾繁胜
邓建伟
翟林燕
梁伟朝
应永茂
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Sunny Optics Zhongshan Co Ltd
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Sunny Optics Zhongshan Co Ltd
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Priority to CN202310473353.2A priority Critical patent/CN116609927A/en
Publication of CN116609927A publication Critical patent/CN116609927A/en
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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
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The application discloses a fisheye lens, which sequentially comprises the following components from an object side to an image side 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 having optical power; a third lens having optical power; a fourth lens having optical power opposite to the optical power of the third lens; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; a sixth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface; and an eighth lens element with positive refractive power having a convex object-side surface and a convex image-side surface.

Description

Fish-eye lens
Technical Field
The application relates to the field of optical elements, in particular to a fish-eye lens.
Background
With the continuous progress of the existing image processing algorithm and AI technology, in recent years, the application of fisheye lenses has become more diversified, and the fisheye lenses are widely applied to various fields such as motion cameras, unmanned aerial vehicles, intelligent doorbell, intelligent home furnishing and the like, so the requirements on the fisheye lenses have become higher and higher.
However, the conventional fisheye lens has a plurality of defects, for example, although the fisheye lens in the market can achieve a larger angle of view, the conventional lens configuration form is difficult to correct the system aberration well, resulting in poor imaging quality of the lens; in addition, the existing fisheye lens is generally unsatisfactory in chromatic aberration correction, and the imaging quality of the lens is seriously affected; in addition, the existing fish-eye lens is often small in relative aperture, poor in light transmission performance and incapable of adapting to dark environments at night or in overcast and rainy days; and the imaging target surface of the existing fisheye lens is smaller, so that the market demand is difficult to meet.
Therefore, how to improve the performance and performance of the fisheye lens in the aspects of the above description and the like provides a fisheye lens with one or more characteristics of large field angle, high imaging quality, large aperture, small size, large target surface and the like, so as to better meet the high demand of market development, and become one of the technical problems to be solved urgently by those skilled in the art at present.
Disclosure of Invention
The application provides a fisheye lens, which sequentially comprises from an object side to an image side 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 having optical power; a third lens having optical power; a fourth lens having optical power opposite to the optical power of the third lens; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; a sixth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface; and an eighth lens element with positive refractive power having a convex object-side surface and a convex image-side surface.
In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the fisheye lens may satisfy: -2.3.ltoreq.f1/f.ltoreq.1.4.
In one embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the fisheye lens may satisfy: -f 2/f is not less than 4.5 and not more than 9.5.
In one embodiment, the combined focal length f234 of the second lens, the third lens and the fourth lens and the total effective focal length f of the fisheye lens may satisfy: -23.0.ltoreq.f234/f.ltoreq.45.0.
In one embodiment, the effective focal length f3 of the third lens and the total effective focal length f of the fisheye lens may satisfy: -2.8.ltoreq.f3/f.ltoreq.3.3.
In one embodiment, the effective focal length f4 of the fourth lens and the total effective focal length f of the fisheye lens may satisfy: -f 4/f is less than or equal to 5.1 and less than or equal to 7.9.
In one embodiment, the effective focal length f5 of the fifth lens and the total effective focal length f of the fisheye lens may satisfy: f5/f is more than or equal to 2.0 and less than or equal to 3.6.
In one embodiment, the combined focal length f67 of the sixth lens and the seventh lens and the total effective focal length f of the fisheye lens may satisfy: -9.2.ltoreq.f67/f.ltoreq.2.5.
In one embodiment, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens may satisfy: -1.2.ltoreq.f5/f6+f5/f7.ltoreq.0.3.
In one embodiment, the effective focal length f8 of the eighth lens and the total effective focal length f of the fisheye lens may satisfy: f8/f is more than or equal to 2.1 and less than or equal to 3.7.
In one embodiment, the total effective focal length f of the fisheye lens and the entrance pupil diameter ENPD of the fisheye lens may satisfy: f/ENPD is less than or equal to 1.70 and less than or equal to 1.85.
In one embodiment, a distance BFL between a center of an image side surface of the eighth lens element and an imaging surface of the fisheye lens element on the optical axis and a distance TTL between a center of an object side surface of the first lens element and the imaging surface on the optical axis may satisfy: BFL/TTL is less than or equal to 0.2.
In one embodiment, the fisheye lens further includes a diaphragm located between the fourth lens and the fifth lens, and a distance THI1 between a center of an object side surface of the first lens and the diaphragm on the optical axis and a distance TTL between a center of an object side surface of the first lens and an imaging surface of the fisheye lens on the optical axis may satisfy: THI1/TTL is more than or equal to 0.4 and less than or equal to 0.6.
In one embodiment, a distance TTL from a center of an object side surface of the first lens to an imaging surface of the fisheye lens on the optical axis and a total effective focal length f of the fisheye lens may satisfy: TTL/f is more than or equal to 7.8 and less than or equal to 8.8.
In one embodiment, the effective optical aperture D1 of the first lens and the image height IH of the fisheye lens may satisfy: D1/IH is more than or equal to 1.1 and less than or equal to 1.5.
In one embodiment, the effective optical aperture D1 of the first lens and the radius of curvature R11 of the object side surface of the first lens may satisfy: D1/R11 is more than or equal to 0.4 and less than or equal to 1.0.
In one embodiment, the radius of curvature R32 of the image side surface of the third lens and the radius of curvature R31 of the object side surface of the third lens may satisfy: -77.ltoreq.R32/R31.ltoreq.0.
In one embodiment, the radius of curvature R51 of the object-side surface of the fifth lens element, the radius of curvature R52 of the image-side surface of the fifth lens element, the radius of curvature R61 of the object-side surface of the sixth lens element, and the radius of curvature R62 of the image-side surface of the sixth lens element may satisfy: and ((R51+R52)/(R61+R62))/(R51-R52)/(R61-R62)) -.ltoreq.1.0.
In one embodiment, the abbe number VD1 of the first lens may satisfy: VD1 is less than or equal to 35.
In one embodiment, the abbe number VD5 of the fifth lens may satisfy: VD5 is more than or equal to 60.
In one embodiment, the refractive index ND1 of the first lens may satisfy: ND1 is more than or equal to 1.80.
The fisheye lens adopts eight lenses, and by reasonably setting parameters such as focal power, surface type, curvature radius, abbe number and the like of each lens, the fisheye lens has the characteristics of large field angle, high imaging quality, large aperture and the like, and simultaneously meets the characteristics of small size, large target surface and the like.
Drawings
Other features, objects, and advantages of the present application will become more apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying drawings. In the drawings:
fig. 1 is a schematic structural view of a fisheye lens according to embodiment 1 of the application;
fig. 2 is a schematic diagram of the structure of a fisheye lens according to embodiment 2 of the application;
fig. 3 is a schematic structural view of a fisheye lens according to embodiment 3 of the application;
fig. 4 is a schematic structural view of a fisheye lens according to embodiment 4 of the application; and
fig. 5 is a schematic structural view of a fisheye lens according to embodiment 5 of the application.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is referred to as the object side of the lens, and the surface of each lens closest to the imaging side is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
In an exemplary embodiment, the fisheye lens includes, for example, eight lenses having optical power, i.e., 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 eight lenses are arranged in order from the object side to the image side along the optical axis.
In an exemplary embodiment, the first lens may have negative optical power. The first lens may have a convex-concave shape. The first lens is in a meniscus shape with a convex surface facing the object space, has negative focal power, can effectively play a role in light receiving, and realizes high resolution at a large field angle; meanwhile, the caliber of the optical system can be effectively regulated and controlled, and the longitudinal miniaturization of the optical lens is realized.
In an exemplary embodiment, the second lens may have positive optical power. The second lens may have a concave-convex shape. The second lens is a positive focal power lens, and is matched with the first lens with negative focal power, so that the marginal visual field aberration can be effectively corrected, and the resolution is improved.
In an exemplary embodiment, the second lens may have negative optical power. The second lens may have a convex-concave shape. The second lens is a negative focal power lens, and meanwhile, the image side surface is concave, so that light rays can be further collected, and the large-angle light rays enter the optical system as much as possible, and the illuminance of the optical system is effectively improved.
In an exemplary embodiment, the third lens may have negative optical power. The third lens may have a concave surface. The third lens is a negative focal power lens, so that light rays are effectively dispersed, and the illumination can be improved while the requirement of the image plane size is met.
In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a convex shape. The third lens is a positive focal power lens, so that light rays are effectively converged, and the third lens is matched with the first lens and the second lens, so that large-view-field aberration can be balanced, and resolution is improved.
In an exemplary embodiment, the fourth lens may have positive optical power. The fourth lens may have a convex-concave type, or the fourth lens may have a concave-convex type. The fourth lens is a positive focal power lens, and is matched with the second lens positive focal power lens and the third lens negative focal power lens, so that chromatic aberration can be eliminated, spherical aberration can be reduced, astigmatism can be corrected, and resolution can be improved.
In an exemplary embodiment, the fourth lens may have negative optical power. The fourth lens may have a concave-convex shape. The fourth lens is a negative focal power lens, and is matched with the second lens negative focal power lens and the third lens positive focal power lens, so that chromatic aberration can be eliminated, spherical aberration can be reduced, astigmatism can be corrected, and resolution can be improved.
In an exemplary embodiment, the fifth lens may have positive optical power. The fifth lens may have a convex shape. The fifth lens is a positive focal power lens, can effectively correct chromatic aberration of the system, and has good balancing effect on high and low temperatures of the optical system.
In an exemplary embodiment, the sixth lens may have positive optical power. The sixth lens may have a convex shape.
In an exemplary embodiment, the seventh lens may have negative optical power. The seventh lens may have a concave surface.
The sixth lens is arranged as a positive focal power lens, and the seventh lens is arranged as a negative focal power lens. The color difference can be corrected by gluing the two lenses of the sixth lens and the seventh lens, so that the imaging quality is improved; while facilitating reduced system tolerance sensitivity.
In an exemplary embodiment, the eighth lens may have positive optical power. The eighth lens may have a convex-convex shape. The eighth lens is a lens with positive focal power, so that aberration can be effectively eliminated; meanwhile, the effect of controlling the emergent angle of the main light is achieved, so that a large target surface is realized.
In an exemplary embodiment, the first lens may have negative optical power, an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the second lens may have optical power; the third lens and the fourth lens may have opposite powers; the fifth lens element may have positive refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be convex; the sixth lens element with positive refractive power may have a convex object-side surface and a convex image-side surface; the seventh lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; and, the eighth lens element may have positive refractive power, wherein the object-side surface thereof may be convex, and the image-side surface thereof may be convex. The arrangement of the focal power and the surface shape of each lens contained in the fish-eye lens is beneficial to the lens with one or more beneficial effects of large field angle, high imaging quality, large aperture, small size, large target surface and the like.
In an exemplary embodiment, the fisheye lens according to the present application may further comprise a stop, which may be located between the fourth lens and the fifth lens, for example. It should be noted that the positions of the diaphragms disclosed herein are merely examples and are not limiting; in alternative embodiments, the diaphragm may be arranged in other positions as desired.
In an exemplary embodiment, the fisheye lens may further include a photosensitive element disposed on the imaging surface. Alternatively, the photosensitive element provided to the imaging surface may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).
In an exemplary embodiment, the sixth lens and the seventh lens may be cemented to form a cemented doublet lens group. The sixth lens and the seventh lens are glued, so that chromatic aberration correction can be facilitated, and imaging quality is improved; while facilitating reduced system tolerance sensitivity.
In an exemplary embodiment, the fisheye lens may include at least one aspherical lens. For example, in one embodiment, the second lens, the third lens, the fourth lens, and the eighth lens may be lenses having aspherical surfaces. For another example, in another embodiment, the second lens, the fourth lens, and the eighth lens may be lenses having aspherical surfaces.
In an exemplary embodiment, the first lens to the eighth lens may be made of glass. The first lens to the eighth lens are made of full glass materials, so that stable imaging of the lens in severe environments such as high temperature, low temperature and the like can be realized.
According to the fisheye lens of the exemplary embodiment of the application, the performance of large target surface and high illumination can be realized. In an exemplary embodiment, the maximum image height of the lens may be up to 8.45mm, and the illuminance may be up to 45% and above.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: -2.3.ltoreq.f1/f.ltoreq.1.4, wherein f1 is the effective focal length of the first lens and f is the total effective focal length of the fish-eye lens. By controlling the ratio of the effective focal length of the first lens to the total effective focal length of the fish-eye lens in the range, the large-angle light rays are favorably emitted into the optical system, and the maximum field angle of the optical system is enlarged.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: -4.5.ltoreq.f2/f.ltoreq.9.5, where f2 is the effective focal length of the second lens and f is the total effective focal length of the fisheye lens. The ratio of the effective focal length of the second lens to the total effective focal length of the fish-eye lens is controlled within the range, so that more light can smoothly enter the optical system, the marginal field aberration is effectively corrected, and the resolution of the lens is improved.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: -23.0.ltoreq.f234/f.ltoreq.45.0, where f234 is the combined focal length of the second lens, the third lens and the fourth lens, and f is the total effective focal length of the fisheye lens. By controlling the ratio of the combined focal length of the second lens, the third lens, and the fourth lens to the total effective focal length of the fisheye lens in this range, chromatic aberration can be eliminated, spherical aberration can be reduced, astigmatism can be corrected, and resolution can be improved.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: -2.8.ltoreq.f3/f.ltoreq.3.3, where f3 is the effective focal length of the third lens and f is the total effective focal length of the fish-eye lens. By controlling the ratio of the effective focal length of the third lens to the total effective focal length of the fisheye lens in this range, chromatic aberration can be eliminated, spherical aberration can be reduced, astigmatism can be corrected, and resolution can be improved.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: -5.1.ltoreq.f4/f.ltoreq.7.9, wherein f4 is the effective focal length of the fourth lens and f is the total effective focal length of the fish-eye lens. By controlling the ratio of the effective focal length of the fourth lens to the total effective focal length of the fish-eye lens in this range, chromatic aberration can be eliminated, spherical aberration can be reduced, astigmatism can be corrected, and resolution can be improved.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: 2.0.ltoreq.f5/f.ltoreq.3.6, where f5 is the effective focal length of the fifth lens and f is the total effective focal length of the fisheye lens. By controlling the ratio of the effective focal length of the fifth lens to the total effective focal length of the fish-eye lens in the range, the chromatic aberration of the system can be effectively corrected, and the high temperature and the low temperature of the optical system can be well balanced.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: -9.2.ltoreq.f67/f.ltoreq.2.5, wherein f67 is the combined focal length of the sixth lens and the seventh lens, and f is the total effective focal length of the fish-eye lens. The ratio of the combined focal length of the sixth lens and the seventh lens to the total effective focal length of the fish-eye lens is controlled in the range, so that chromatic aberration correction is facilitated, and imaging quality is improved; while facilitating reduced system tolerance sensitivity.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: -1.2.ltoreq.f5/f6+f5/f7.ltoreq.0.3, where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. The effective focal length of the fifth lens, the effective focal length of the sixth lens and the effective focal length of the seventh lens are controlled to be less than or equal to 1.2 and less than or equal to-0.3, so that the optical power is reasonably distributed, and the imaging quality is improved; while facilitating reduced system tolerance sensitivity.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: 2.1.ltoreq.f8/f.ltoreq.3.7, where f8 is the effective focal length of the eighth lens, and f is the total effective focal length of the fisheye lens. The ratio of the effective focal length of the eighth lens to the total effective focal length of the fisheye lens is controlled in the range, so that the effect of controlling the emergent angle of the main light can be achieved, and a high-illuminance large target surface can be realized; the maximum image height of the lens can reach 8.45mm, and the illuminance can be more than or equal to 45%.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: f is equal to or greater than 1.70 and equal to or less than 1.85 per ENPD, wherein f is the total effective focal length of the fisheye lens and ENPD is the entrance pupil diameter of the fisheye lens. By controlling the ratio of the total effective focal length of the lens to the entrance pupil diameter of the lens in this range, a large aperture of the fisheye lens can be realized.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: BFL/TTL is less than or equal to 0.2, wherein BFL is the distance between the center of the image side surface of the eighth lens and the imaging surface of the fisheye lens on the optical axis, and TTL is the distance between the center of the object side surface of the first lens and the imaging surface on the optical axis. By controlling the ratio of the distance from the center of the image side surface of the eighth lens to the imaging surface of the fisheye lens on the optical axis to the distance from the center of the object side surface of the first lens to the imaging surface on the optical axis in this range, miniaturization of the fisheye lens can be facilitated.
In an exemplary embodiment, the fisheye lens comprises, for example, a stop between the fourth lens and the fifth lens, the fisheye lens according to the application may fulfil: and the THI1/TTL is more than or equal to 0.4 and less than or equal to 0.6, wherein THI1 is the distance between the center of the object side surface of the first lens and the diaphragm on the optical axis, and TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the fisheye lens on the optical axis. By controlling the ratio of the distance from the center of the object side surface of the first lens to the diaphragm on the optical axis to the distance from the center of the object side surface of the first lens to the imaging surface of the fisheye lens on the optical axis in this range, miniaturization of the fisheye lens can be facilitated.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: and TTL/f is more than or equal to 7.8 and less than or equal to 8.8, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the fisheye lens on the optical axis, and f is the total effective focal length of the fisheye lens. By controlling the ratio of the distance from the center of the object side surface of the first lens to the imaging surface of the fisheye lens on the optical axis to the total effective focal length of the fisheye lens in this range, miniaturization of the lens can be facilitated.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: 1.1.ltoreq.D1/IH.ltoreq.1.5, wherein D1 is the effective optical aperture of the first lens and IH is the image height of the fish-eye lens. By controlling the ratio of the effective optical aperture of the first lens to the image height of the fish-eye lens in this range, downsizing of the lens can be facilitated.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: 0.4.ltoreq.D1/R11.ltoreq.1.0, where D1 is the effective optical aperture of the first lens and R11 is the radius of curvature of the object side of the first lens. By controlling the ratio of the effective optical aperture of the first lens to the radius of curvature of the object side surface of the first lens in this range, downsizing of the lens can be facilitated.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: -77.ltoreq.R32/R31.ltoreq.0, wherein R32 is the radius of curvature of the image side of the third lens and R31 is the radius of curvature of the object side of the third lens. By controlling the ratio of the curvature radius of the image side surface of the third lens to the curvature radius of the object side surface of the third lens in the range, the light ray trend can be reasonably distributed, and the resolution can be improved while the large target surface is ensured.
In an exemplary embodiment, the fisheye lens according to the present application may satisfy: and (R51+R52)/(R61+R62))/(R51-R52)/(R61-R62)) -1.0, wherein R51 is a radius of curvature of an object-side surface of the fifth lens element, R52 is a radius of curvature of an image-side surface of the fifth lens element, R61 is a radius of curvature of an object-side surface of the sixth lens element, and R62 is a radius of curvature of an image-side surface of the sixth lens element. By controlling the curvature radius of the object side surface of the fifth lens element, the curvature radius of the image side surface of the fifth lens element, the curvature radius of the object side surface of the sixth lens element and the curvature radius of the image side surface of the sixth lens element to satisfy the condition that the absolute value of (R51+R52)/(R61+R62))/(R51-R52)/(R61-R62))/(R < 1.0), the deviation of the incident angle and the exit angle of the light rays with different fields of view can be reduced, the light rays can be smoothly transited, the tolerance sensitivity can be reduced, and the improvement of the yield of the lens can be facilitated.
In an exemplary embodiment, the abbe number VD1 of the first lens of the fisheye lens according to the present application may satisfy: VD1 is less than or equal to 35. By controlling the Abbe number of the first lens in this range, the chromatic aberration of the system can be balanced, and the resolution can be improved.
In an exemplary embodiment, the abbe number VD5 of the fifth lens of the fisheye lens according to the present application may satisfy: VD5 is more than or equal to 60. By controlling the abbe number of the fifth lens in this range, for example, using an anomalous dispersion material, it is possible to balance the high-low temperature performance of the system while correcting chromatic aberration to improve resolution.
In an exemplary embodiment, the refractive index ND1 of the first lens of the fisheye lens according to the present application may satisfy: ND1 is more than or equal to 1.80. By controlling the refractive index of the first lens in this range, for example, using ND.gtoreq.1.80 material, the aperture of the lens can be effectively limited, and miniaturization can be achieved; meanwhile, the light rays with large angles can be injected into the optical system, and the maximum field angle of the optical system is enlarged.
In an exemplary embodiment, the fisheye lens of the present application may further include a filter and/or a cover glass disposed between the eighth lens and the imaging plane, as needed. The optical filter may filter light having a specific wavelength, and the cover glass may prevent an image side element (e.g., a chip) of the fisheye lens from being damaged.
The fisheye lens according to embodiments of the application may employ multiple lenses, such as eight lenses as described above. Through reasonable setting of the parameters such as focal power, surface shape, curvature radius and Abbe number of each lens, and reasonable setting of the cemented lens group, the fisheye lens with the characteristics of large field angle, high imaging quality, large aperture and the like and the characteristics of small size, large target surface and the like is provided.
However, those skilled in the art will appreciate that the various results and advantages described in this specification can be obtained by changing the number of lenses making up a lens barrel without departing from the technical solution claimed in the present application. For example, although eight lenses are described as an example in the embodiment, the fisheye lens is not limited to include eight lenses. The fisheye lens may also include other numbers of lenses, if desired. Specific examples of the fish-eye lens applicable to the above embodiments are further described below with reference to the accompanying drawings.
Example 1
Fig. 1 is a schematic structural view of a fisheye lens according to embodiment 1 of the application, and a fisheye lens according to embodiment 1 of the application is described below with reference to fig. 1.
As shown in fig. 1, the fisheye lens sequentially includes, from an object side to an image side along an optical axis: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the stop STO, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the optical filter and/or the cover glass CG, and the imaging plane IMA. Wherein the sixth lens L6 and the seventh lens L7 are cemented to form a cemented doublet.
In this embodiment, the first lens element L1 has a negative refractive power, wherein the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element L2 has positive refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex. The third lens element L3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave. The fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element L5 has positive refractive power, wherein an object-side surface S10 thereof is convex, and an image-side surface S11 thereof is convex. The sixth lens element L6 has positive refractive power, wherein an object-side surface S12 thereof is convex, and an image-side surface S13 thereof is convex. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex.
In this embodiment, the stop STO of the fisheye lens is disposed between the fourth lens L4 and the fifth lens L5.
In this embodiment, the filter and/or cover glass CG located between the eighth lens L8 and the imaging plane has an object side surface S17 and an image side surface S18. Light from the object passes sequentially through the respective surfaces S1 to S18 and is finally imaged on an imaging plane, where an image sensing chip IMA may be arranged.
Table 1 shows the radius of curvature R, thickness d/distance T, refractive index N, and abbe number Vd of each lens of the fisheye lens of example 1. It should be understood that, regarding the "thickness d/distance T", the thickness d/distance T of the row where S1 is located is the center thickness of the first lens L1, the thickness d/distance T of the row where S2 is located is the air gap distance between the first lens L1 and the second lens L2, the thickness d/distance T of the row where S3 is located is the center thickness of the second lens L2, and so on.
TABLE 1
In this embodiment, the maximum field angle fov=160° of the fisheye lens, and the aperture value fno=1.80 of the fisheye lens.
In embodiment 1, the object side surface and the image side surface of the second lens element L2, the third lens element L3, the fourth lens element L4 and the eighth lens element L8 are aspheric, and the surface profile x of each aspheric lens element can be defined by, but not limited to, the following aspheric formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S3 to S8, S15 and S16 in example 1 are shown in Table 2 below 4 、A 6 、A 8 、A 10 And A 12 。
Face number k A4 A6 A8 A10 A12
S3 1.72 9.39E-03 -7.89E-04 9.87E-05 -6.28E-06 4.27E-07
S4 0.40 7.07E-03 -1.31E-03 2.38E-04 -2.55E-05 1.66E-06
S5 -1.91 1.13E-03 -1.33E-03 3.77E-04 -4.40E-05 2.28E-06
S6 27.23 1.47E-03 -3.55E-04 -1.02E-04 2.06E-05 -1.71E-06
S7 -0.14 8.71E-04 -4.04E-04 2.37E-05 1.65E-06 -2.56E-07
S8 0.00 4.65E-03 1.92E-04 -2.67E-05 8.94E-06 -9.36E-07
S15 -1.34 2.42E-03 1.24E-04 -8.20E-06 6.78E-07 -1.61E-08
S16 -20.37 8.66E-04 6.48E-04 -5.03E-05 3.09E-06 -7.96E-08
TABLE 2
Example 2
Fig. 2 shows a schematic configuration of a fisheye lens according to embodiment 2 of the application, and the fisheye lens according to embodiment 2 of the application is described below with reference to fig. 2. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity.
As shown in fig. 2, the fisheye lens sequentially includes, from an object side to an image side along an optical axis: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the stop STO, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the optical filter and/or the cover glass CG, and the imaging plane IMA. Wherein the sixth lens L6 and the seventh lens L7 are cemented to form a cemented doublet.
In this embodiment, the first lens element L1 has a negative refractive power, wherein the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element L2 has positive refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex. The third lens element L3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave. The fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element L5 has positive refractive power, wherein an object-side surface S10 thereof is convex, and an image-side surface S11 thereof is convex. The sixth lens element L6 has positive refractive power, wherein an object-side surface S12 thereof is convex, and an image-side surface S13 thereof is convex. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex.
In this embodiment, the stop STO of the fisheye lens is disposed between the fourth lens L4 and the fifth lens L5.
In this embodiment, the filter and/or cover glass CG located between the eighth lens L8 and the imaging plane has an object side surface S17 and an image side surface S18. Light from the object passes sequentially through the respective surfaces S1 to S18 and is finally imaged on an imaging plane, where an image sensing chip IMA may be arranged.
Table 3 shows the radius of curvature R, thickness d/distance T, refractive index N, and abbe number Vd of each lens of the fisheye lens of example 2.
TABLE 3 Table 3
In this embodiment, the maximum field angle fov=160° of the fisheye lens, and the aperture value fno=1.73 of the fisheye lens.
In this embodiment, the object-side surface and the image-side surface of the second lens element L2, the third lens element L3, the fourth lens element L4, and the eighth lens element L8 are aspherical surfaces, and each aspherical surface type can be defined by the formula (1) given in embodiment 1. Table 4 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S3 to S8, S15 and S16 used in this example 4 、A 6 、A 8 、A 10 、A 12 And A 14 。
Face number k A4 A6 A8 A10 A12 A14
S3 0.89 2.06E-03 -1.07E-04 -1.03E-05 2.22E-06 -8.63E-08 -7.95E-10
S4 -0.27 7.60E-03 -1.16E-03 1.63E-04 -1.32E-05 6.68E-07 -1.17E-09
S5 -0.01 1.14E-02 -2.17E-03 3.57E-04 -2.39E-05 7.60E-07 -9.99E-10
S6 0.00 1.45E-03 4.64E-03 -1.24E-03 1.52E-04 -7.89E-06 -4.36E-09
S7 0.00 3.45E-03 2.70E-03 -7.68E-04 9.46E-05 -4.82E-06 -1.05E-09
S8 2.45 1.37E-03 2.99E-04 -8.56E-05 1.07E-05 -5.58E-07 -1.24E-10
S15 -0.03 -1.88E-03 1.06E-04 -7.39E-06 6.97E-07 3.65E-10 0.00E+00
S16 0.41 2.73E-03 -1.32E-04 3.79E-05 -3.26E-06 1.50E-07 0.00E+00
TABLE 4 Table 4
Example 3
Fig. 3 shows a schematic structural view of a fisheye lens according to embodiment 3 of the application, and the fisheye lens according to embodiment 3 of the application is described below with reference to fig. 3.
As shown in fig. 3, the fisheye lens sequentially includes, from an object side to an image side along an optical axis: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the stop STO, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the optical filter and/or the cover glass CG, and the imaging plane IMA. Wherein the sixth lens L6 and the seventh lens L7 are cemented to form a cemented doublet.
In this embodiment, the first lens element L1 has a negative refractive power, wherein the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element L2 has positive refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex. The third lens element L3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave. The fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element L5 has positive refractive power, wherein an object-side surface S10 thereof is convex, and an image-side surface S11 thereof is convex. The sixth lens element L6 has positive refractive power, wherein an object-side surface S12 thereof is convex, and an image-side surface S13 thereof is convex. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex.
In this embodiment, the stop STO of the fisheye lens is disposed between the fourth lens L4 and the fifth lens L5.
In this embodiment, the filter and/or cover glass CG located between the eighth lens L8 and the imaging plane has an object side surface S17 and an image side surface S18. Light from the object passes sequentially through the respective surfaces S1 to S18 and is finally imaged on an imaging plane, where an image sensing chip IMA may be arranged.
Table 5 shows the radius of curvature R, thickness d/distance T, refractive index N, and abbe number Vd of each lens of the fisheye lens of example 3.
TABLE 5
In this embodiment, the maximum field angle fov=160° of the fisheye lens, and the aperture value fno=1.73 of the fisheye lens.
In this embodiment, the object-side surface and the image-side surface of the second lens element L2, the third lens element L3, the fourth lens element L4, and the eighth lens element L8 are aspherical surfaces, and each aspherical surface type can be defined by the formula (1) given in embodiment 1. Table 6 shows the cone coefficients k and the higher order coefficients A for each of the aspherical mirror surfaces S3 to S8, S15 and S16 that can be used in this embodiment 4 、A 6 、A 8 、A 10 And A 12 。
Face number k A4 A6 A8 A10 A12
S3 -0.51 2.12E-03 -2.26E-04 1.95E-05 -9.86E-07 2.46E-08
S4 -0.15 7.43E-03 -1.28E-03 2.23E-04 -2.03E-05 7.41E-07
S5 -0.28 8.31E-03 -1.47E-03 3.07E-04 -3.48E-05 1.55E-06
S6 0.00 2.80E-03 4.86E-03 -1.27E-03 1.55E-04 -8.21E-06
S7 0.00 3.91E-03 2.32E-03 -7.24E-04 9.71E-05 5.48E-06
S8 5.89 1.25E-03 1.91E-04 -7.26E-05 9.97E-06 -5.37E-07
S15 0.12 -1.39E-03 1.64E-04 -8.07E-06 1.27E-06 -5.03E-08
S16 -0.85 2.80E-03 -1.15E-04 4.33E-05 -3.64E-06 1.77E-07
TABLE 6
Example 4
Fig. 4 shows a schematic structural view of a fisheye lens according to embodiment 4 of the application, and a fisheye lens according to embodiment 4 of the application is described below with reference to fig. 4.
As shown in fig. 4, the fisheye lens sequentially includes, from an object side to an image side along an optical axis: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the stop STO, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the optical filter and/or the cover glass CG, and the imaging plane IMA. Wherein the sixth lens L6 and the seventh lens L7 are cemented to form a cemented doublet.
In this embodiment, the first lens element L1 has a negative refractive power, wherein the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element L4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element L5 has positive refractive power, wherein an object-side surface S10 thereof is convex, and an image-side surface S11 thereof is convex. The sixth lens element L6 has positive refractive power, wherein an object-side surface S12 thereof is convex, and an image-side surface S13 thereof is convex. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex.
In this embodiment, the stop STO of the fisheye lens is disposed between the fourth lens L4 and the fifth lens L5.
In this embodiment, the filter and/or cover glass CG located between the eighth lens L8 and the imaging plane has an object side surface S17 and an image side surface S18. Light from the object passes sequentially through the respective surfaces S1 to S18 and is finally imaged on an imaging plane, where an image sensing chip IMA may be arranged.
Table 7 shows the radius of curvature R, thickness d/distance T, refractive index N, and abbe number Vd of each lens of the fisheye lens of example 4.
TABLE 7
In this embodiment, the maximum field angle fov=160° of the fisheye lens, and the aperture value fno=1.80 of the fisheye lens.
In this embodiment, the object-side surface and the image-side surface of each of the second lens L2, the fourth lens L4, and the eighth lens L8 are aspherical, and each aspherical surface type can be defined by the formula (1) given in embodiment 1 above. Table 8 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S3, S4, S7, S8, S15 and S16 used in this example 4 、A 6 、A 8 、A 10 And A 12 。
Face number k A4 A6 A8 A10 A12
S3 -6.62 1.06E-02 -9.20E-04 8.31E-05 -5.56E-06 1.18E-07
S4 0.35 1.06E-02 -1.11E-03 1.11E-04 -1.44E-05 2.12E-08
S7 -0.28 1.06E-02 -4.55E-05 -1.49E-05 5.62E-06 -2.62E-07
S8 -0.56 6.92E-03 -3.59E-05 3.81E-05 -3.52E-06 3.79E-07
S15 0.73 5.99E-04 1.65E-04 -1.88E-05 1.07E-06 -2.86E-08
S16 -9.07 -8.39E-04 3.64E-04 -2.09E-05 9.09E-07 -2.82E-08
TABLE 8
Example 5
Fig. 5 shows a schematic structural view of a fisheye lens according to embodiment 5 of the application, and the fisheye lens according to embodiment 5 of the application is described below with reference to fig. 5.
As shown in fig. 5, the fisheye lens sequentially includes, from an object side to an image side along an optical axis: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the stop STO, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the optical filter and/or the cover glass CG, and the imaging plane IMA. Wherein the sixth lens L6 and the seventh lens L7 are cemented to form a cemented doublet.
In this embodiment, the first lens element L1 has a negative refractive power, wherein the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element L4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element L5 has positive refractive power, wherein an object-side surface S10 thereof is convex, and an image-side surface S11 thereof is convex. The sixth lens element L6 has positive refractive power, wherein an object-side surface S12 thereof is convex, and an image-side surface S13 thereof is convex. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex.
In this embodiment, the stop STO of the fisheye lens is disposed between the fourth lens L4 and the fifth lens L5.
In this embodiment, the filter and/or cover glass CG located between the eighth lens L8 and the imaging plane has an object side surface S17 and an image side surface S18. Light from the object passes sequentially through the respective surfaces S1 to S18 and is finally imaged on an imaging plane, where an image sensing chip IMA may be arranged.
Table 9 shows the radius of curvature R, thickness d/distance T, refractive index N, and abbe number Vd of each lens of the fisheye lens of example 5.
TABLE 9
In this embodiment, the maximum field angle fov=160° of the fisheye lens, and the aperture value fno=1.80 of the fisheye lens.
In this embodiment, the object-side surface and the image-side surface of the second lens L2, the fourth lens L4 and the eighth lens L8 are each aspherical, and each aspherical surface type can be given in embodiment 1 aboveIs defined by formula (1). Table 10 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S3, S4, S7, S8, S15 and S16 used in this example 4 、A 6 、A 8 、A 10 And A 12 。
Face number k A4 A6 A8 A10 A12
S3 -0.71 1.03E-02 -9.34E-04 1.01E-04 -8.31E-06 2.24E-07
S4 -0.06 1.32E-02 -1.51E-03 2.80E-04 -4.63E-05 2.15E-06
S7 -0.69 1.29E-02 -3.76E-04 2.83E-05 -2.00E-06 2.01E-07
S8 -2.79 7.82E-03 -1.94E-05 1.49E-05 -2.34E-06 3.75E-07
S15 1.46 1.61E-03 1.49E-04 -1.79E-05 1.06E-06 -2.48E-08
S16 -29.59 5.37E-04 6.06E-04 -5.19E-05 2.42E-06 -5.33E-08
In summary, examples 1 to 5 satisfy the relationships shown in table 11 below.
Conditional\embodiment Example 1 Example 2 Example 3 Example 4 Example 5
f1/f -1.63 -1.60 -1.89 -1.93 -2.00
f2/f 9.09 3.45 3.11 -3.38 -4.18
f234/f 14.99 8.68 44.26 -22.22 -10.28
f3/f -1.80 -2.40 -2.53 2.32 3.20
f4/f 2.08 4.21 7.57 -4.33 -4.91
f5/f 2.56 3.45 2.65 2.17 2.21
f67/f -8.95 -5.83 -4.24 -3.44 -5.50
f5/f6+f5/f7 -0.40 -1.10 -1.03 -0.82 -0.60
f8/f 3.49 2.56 2.64 2.23 2.63
f/ENPD 1.80 1.73 1.73 1.80 1.80
BFL/TTL 0.14 0.17 0.13 0.15 0.14
THI1/TTL 0.45 0.43 0.42 0.41 0.44
TTL/f 8.42 8.23 8.22 8.59 8.68
D1/IH 1.19 1.18 1.30 1.28 1.37
D1/R11 0.83 0.88 0.75 0.58 0.53
R32/R31 -5.13 -13.85 -76.73 -0.47 -0.07
|((R51+R52)/(R61+R62))/((R51-R52)/(R61-R62))| 0.37 0.75 0.90 0.33 0.09
VD1 31.32 28.32 25.48 31.32 31.32
VD5 90.19 94.52 81.61 68.62 63.41
ND1 1.90 2.00 1.81 1.90 1.90
TABLE 11
The application also provides electronic equipment, which can comprise the fisheye lens and an imaging element for converting an optical image formed by the fisheye lens into an electric signal.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (10)

1. The fisheye lens is characterized by sequentially comprising, from an object side to an image side 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 having optical power;
a third lens having optical power;
a fourth lens having optical power opposite to the optical power of the third lens;
the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
a sixth lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface; and
the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a convex surface.
2. The fish-eye lens of claim 1, wherein the effective focal length f1 of the first lens and the total effective focal length f of the fish-eye lens satisfy: -2.3.ltoreq.f1/f.ltoreq.1.4.
3. The fish-eye lens of claim 1, wherein the effective focal length f2 of the second lens and the total effective focal length f of the fish-eye lens satisfy: -f 2/f is not less than 4.5 and not more than 9.5.
4. The fish-eye lens of claim 1, wherein a combined focal length f234 of the second lens, the third lens, and the fourth lens and a total effective focal length f of the fish-eye lens satisfy: -23.0.ltoreq.f234/f.ltoreq.45.0.
5. The fish-eye lens of claim 1, wherein the effective focal length f3 of the third lens and the total effective focal length f of the fish-eye lens satisfy: -2.8.ltoreq.f3/f.ltoreq.3.3.
6. The fish-eye lens of claim 1, wherein the effective focal length f4 of the fourth lens and the total effective focal length f of the fish-eye lens satisfy: -f 4/f is less than or equal to 5.1 and less than or equal to 7.9.
7. The fish-eye lens of claim 1, wherein the effective focal length f5 of the fifth lens and the total effective focal length f of the fish-eye lens satisfy: f5/f is more than or equal to 2.0 and less than or equal to 3.6.
8. The fish-eye lens of claim 1, wherein the combined focal length f67 of the sixth lens and the seventh lens and the total effective focal length f of the fish-eye lens satisfy: -9.2.ltoreq.f67/f.ltoreq.2.5.
9. The fish-eye lens of claim 1, wherein the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: -1.2.ltoreq.f5/f6+f5/f7.ltoreq.0.3.
10. The fish-eye lens of claim 1, wherein the effective focal length f8 of the eighth lens and the total effective focal length f of the fish-eye lens satisfy: f8/f is more than or equal to 2.1 and less than or equal to 3.7.
CN202310473353.2A 2023-04-27 2023-04-27 Fish-eye lens Pending CN116609927A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117369097A (en) * 2023-12-08 2024-01-09 武汉墨光科技有限公司 Large-aperture large-target-surface miniature fish-eye lens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117369097A (en) * 2023-12-08 2024-01-09 武汉墨光科技有限公司 Large-aperture large-target-surface miniature fish-eye lens
CN117369097B (en) * 2023-12-08 2024-02-27 武汉墨光科技有限公司 Large-aperture large-target-surface miniature fish-eye lens

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