CN217404610U - Large-aperture fisheye lens - Google Patents
Large-aperture fisheye lens Download PDFInfo
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- CN217404610U CN217404610U CN202221508371.7U CN202221508371U CN217404610U CN 217404610 U CN217404610 U CN 217404610U CN 202221508371 U CN202221508371 U CN 202221508371U CN 217404610 U CN217404610 U CN 217404610U
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Abstract
The utility model relates to the technical field of imaging lenses, in particular to a large-aperture fish-eye lens which sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from an object side to an image side, the optical lens comprises a seventh lens with negative focal power, an eighth lens with positive focal power, a ninth lens with negative focal power, a tenth lens with positive focal power, an eleventh lens with positive focal power, an object side surface of the eleventh lens and a twelfth lens with negative focal power, wherein an image side surface of the third lens is optically cemented with an object side surface of the fourth lens, an image side surface of the fifth lens is cemented with an object side surface of the sixth lens, and an image side surface of the eighth lens is cemented with an object side surface of the ninth lens. The utility model discloses, compare with fisheye camera lens in the past, increaseed the camera lens aperture, the definition of camera lens has obtained the promotion.
Description
Technical Field
The utility model relates to an imaging lens technical field specifically is a fisheye lens of large aperture.
Background
The fisheye lens is an optical lens with a very large field angle and a very short focal length, and because the very large field angle is often used in the photographing fields of motion cameras, panoramic cameras and the like, along with the development of the photographing technology, the requirements of users on the imaging image quality are higher and higher, and the existing fisheye lens cannot meet the high requirements on the image quality, so that the fisheye lens with the large aperture is provided for solving the problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a fisheye lens of large aperture compares with fisheye lens in the past, has increaseed the camera lens aperture, and the definition of camera lens has obtained the promotion to solve the problem of proposing among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a large-aperture fisheye lens includes, in order from an object side to an image side:
the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens with positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;
the fourth lens with negative focal power is provided with a concave object side surface and a convex image side surface;
the fifth lens has positive focal power, and the object-side surface and the image-side surface of the fifth lens are convex surfaces;
the sixth lens with negative focal power is characterized in that the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface;
the seventh lens with negative focal power, the object side surface and the image side surface of the seventh lens are both concave surfaces;
the object side surface and the image side surface of the eighth lens are convex surfaces;
the ninth lens is provided with negative focal power, the object side surface of the ninth lens is a concave surface, and the image side surface of the ninth lens is a convex surface;
the tenth lens has positive focal power, and the object side surface and the image side surface of the tenth lens are convex surfaces;
the eleventh lens has positive focal power, and both the object-side surface and the image-side surface of the eleventh lens are convex surfaces;
and the twelfth lens is provided with negative focal power, the object side surface of the twelfth lens is a concave surface, and the image side surface of the twelfth lens is a convex surface.
Preferably, the image-side surface of the third lens is optically cemented to the object-side surface of the fourth lens.
Preferably, the image side surface of the fifth lens is cemented with the object side surface of the sixth lens.
Preferably, the image-side surface of the eighth lens element is cemented with the object-side surface of the ninth lens element.
Preferably, the image-side surface of the eleventh lens is cemented with the object-side surface of the twelfth lens.
By the foregoing technical scheme the utility model provides a can find out, the utility model provides a pair of large aperture's fisheye lens, beneficial effect is: compare with the fisheye lens in the past, enlarged the camera lens aperture, the definition of camera lens has obtained the promotion.
Drawings
Fig. 1 is a schematic view of the overall structure of a large-aperture fisheye lens of the present invention;
fig. 2 is a MTF graph of a fisheye lens with a large aperture according to the present invention.
In the figure: l1, first lens; l2, second lens; l3, third lens; l4, fourth lens; l5, fifth lens; l6, sixth lens; l7, seventh lens; l8, eighth lens; l9, ninth lens; l10, tenth lens; l11, eleventh lens; l12, twelfth lens.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
For better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the present invention.
As shown in fig. 1-2, an embodiment of the present invention provides a large-aperture fisheye lens, which includes, in order from a side to an image side:
the first lens L1 with negative focal power, the object side surface of the first lens L1 is a convex surface, and the image side surface is a concave surface;
a second lens element L2 with negative power, the object-side surface of the second lens element L2 being convex and the image-side surface being concave;
the third lens L3 with positive focal power has a concave object-side surface and a convex image-side surface, wherein the object-side surface of the third lens L3 is concave;
a fourth lens element L4 having negative power, the fourth lens element L4 having a concave object-side surface and a convex image-side surface;
the fifth lens L5 with positive focal power has a convex object-side surface and a convex image-side surface of the fifth lens L5;
the sixth lens element L6 with negative focal power has a concave object-side surface and a convex image-side surface, wherein the object-side surface of the sixth lens element L6 is concave;
a seventh lens L7 having a negative refractive power, wherein the object-side surface and the image-side surface of the seventh lens L7 are both concave;
the eighth lens L8 with positive refractive power has a convex object-side surface and a convex image-side surface of the eighth lens L8;
the ninth lens element L9 with negative focal power has a concave object-side surface and a convex image-side surface, and the ninth lens element L9 is a concave surface;
the tenth lens L10 with positive refractive power has a convex object-side surface and a convex image-side surface of the tenth lens L10;
the eleventh lens L11 having positive refractive power, the object-side surface and the image-side surface of the eleventh lens L11 both being convex;
the twelfth lens L12 with negative power has a concave object-side surface and a convex image-side surface, and the twelfth lens L12 is a concave surface.
In the above configuration, the image-side surface of the third lens L3 is cemented with the object-side surface of the fourth lens L4.
In the above configuration, the image-side surface of the fifth lens L5 is cemented with the object-side surface of the sixth lens L6.
In the above structure, the image-side surface of the eighth lens element is cemented with the object-side surface of the ninth lens element.
In the above structure, the image-side surface of the eleventh lens element is cemented to the object-side surface of the twelfth lens element.
Furthermore, each lens parameter is shown in table one, and the used lenses are all conventional spherical lenses, and no aspheric lens is used, so that the processing is simpler.
Watch 1
Further, the fisheye lens with a large aperture described in this embodiment achieves the following technical indexes: focal length f is 14.5 mm; the field angle 2w is 180 °; distortion is less than 100%; the optical total length is less than 100 mm; f-number F is 2.0; the applicable spectral line range is 435-850 nm.
In the embodiment, in the optical design, through reasonable design of the lens, four groups of cemented lenses are used, so that the lens is simpler in assembly, and H-FK61 glass is used on the right side of the diaphragm to correct the imaging quality of the lens in the infrared light range.
Fig. 2 is an mtf diagram of the lens of the embodiment at a half field of view of 90 °, where the central field of view is greater than 0.5 at the 30 line pairs, and the edge field of view is greater than 0.3 at the 30 line pairs, which shows that the lens can meet the requirement of high-definition imaging.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A large-aperture fisheye lens is characterized in that: the image sensor sequentially comprises the following components from an object side to an image side:
a first lens (L1) having a negative optical power, the first lens (L1) having a convex object-side surface and a concave image-side surface;
a second lens (L2) having negative optical power, the second lens (L2) having a convex object-side surface and a concave image-side surface;
a third lens (L3) having positive optical power, the third lens (L3) having a concave object-side surface and a convex image-side surface;
a fourth lens (L4) having a negative optical power, the fourth lens (L4) having a concave object-side surface and a convex image-side surface;
a fifth lens (L5) with positive optical power, wherein the object side surface and the image side surface of the fifth lens (L5) are convex surfaces;
a sixth lens (L6) having negative optical power, the sixth lens (L6) having a concave object-side surface and a convex image-side surface;
a seventh lens (L7) having a negative optical power, the seventh lens (L7) having a concave object-side surface and a concave image-side surface;
an eighth lens (L8) having positive optical power, wherein the object-side surface and the image-side surface of the eighth lens (L8) are convex;
a ninth lens (L9) having negative optical power, the ninth lens (L9) having a concave object-side surface and a convex image-side surface;
a tenth lens (L10) having positive optical power, the tenth lens (L10) having a convex object-side surface and a convex image-side surface;
an eleventh lens (L11) having positive optical power, wherein the object-side surface and the image-side surface of the eleventh lens (L11) are convex;
a twelfth lens (L12) having a negative optical power, the twelfth lens (L12) having a concave object-side surface and a convex image-side surface.
2. A large aperture fish-eye lens as claimed in claim 1, wherein: the image-side surface of the third lens (L3) is optically cemented with the object-side surface of the fourth lens (L4).
3. A large aperture fish-eye lens as claimed in claim 1, wherein: the image side surface of the fifth lens (L5) is cemented with the object side surface of the sixth lens (L6).
4. A large aperture fish-eye lens as claimed in claim 1, wherein: the image side surface of the eighth lens (L8) is cemented with the object side surface of the ninth lens (L9).
5. A large aperture fish-eye lens as claimed in claim 1, wherein: the image side surface of the eleventh lens (L11) is cemented with the object side surface of the twelfth lens (L12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221508371.7U CN217404610U (en) | 2022-06-15 | 2022-06-15 | Large-aperture fisheye lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221508371.7U CN217404610U (en) | 2022-06-15 | 2022-06-15 | Large-aperture fisheye lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217404610U true CN217404610U (en) | 2022-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221508371.7U Active CN217404610U (en) | 2022-06-15 | 2022-06-15 | Large-aperture fisheye lens |
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| Country | Link |
|---|---|
| CN (1) | CN217404610U (en) |
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2022
- 2022-06-15 CN CN202221508371.7U patent/CN217404610U/en active Active
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