CN211123456U - Fisheye lens - Google Patents
Fisheye lens Download PDFInfo
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- CN211123456U CN211123456U CN202020008652.0U CN202020008652U CN211123456U CN 211123456 U CN211123456 U CN 211123456U CN 202020008652 U CN202020008652 U CN 202020008652U CN 211123456 U CN211123456 U CN 211123456U
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Abstract
The utility model discloses a fisheye lens, including the projection lens body, the projection lens is including locating the lens subassembly of the coaxial setting of a plurality of between projection face and the image planes, the lens subassembly is first negative meniscus lens, the negative meniscus lens of second, the two cemented lens of third, fourth positive lens, the two cemented lens of fifth, the two cemented lens of sixth positive lens, the two cemented lens of seventh and the two cemented lens of eighth from the coaxial arrangement order of a plurality of between the projection face piece. The utility model discloses use the diaphragm as the border, negative group lens is in the front, and positive group lens is the anti-far distance type objective at back, selects the camera lens of close structure as initial structure according to this structure, changes the image plane size, through the optimal design of change increase and decrease glass material, focus zoom and aberration control, finally reaches the projection lens design of good quality.
Description
Technical Field
The utility model belongs to the camera lens field especially relates to a fisheye camera lens.
Background
At present, the F-Theta distortion is larger for the fisheye lens with the angle larger than 180 degrees. The use of an aspherical lens enables control of F-Theta distortion, but at a high cost.
The fisheye lens can realize that the image plane deviates from the main shaft by adding the reflector between the tail end of the lens and the image plane. Preferably, the main axis of the lens and the main axis of the image plane form 90 degrees, two ultra-wide angle fisheye lenses with opposite directions can realize 360-degree panoramic shooting, and the two image planes are on the same chip. But this puts certain requirements on the length of the back focus of the lens.
A single lens can achieve the image quality of a perfect circle 4K, namely the image plane is an inscribed circle of a square 4K, and the image quality of a panorama 8K can be achieved through two image planes of two ultra-wide angle fisheye lenses with opposite directions.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a fisheye lens, which utilizes a spherical lens to design the fisheye lens, achieves higher definition and resolution, controls smaller distortion, and realizes that the image plane is an inscribed circle of a square 4K by a single lens; the fisheye lens is a reverse-distance objective lens with a diaphragm as a boundary, a negative lens group in front and a positive lens group in back, the lens with a similar structure is selected as an initial structure according to the structure, the size of an image surface is changed, and finally the design of a projection lens with excellent image quality is achieved by changing and increasing glass materials, zooming and aberration control.
The utility model discloses a structure be: the utility model provides a fisheye lens, includes the projection lens body, the projection lens is including locating the lens subassembly of the coaxial setting of a plurality of between projection face and the image plane, the lens subassembly is first negative meniscus lens, the negative meniscus lens of second, third double-glued lens, fourth positive lens, the double-glued lens of fifth, sixth positive lens, the double-glued lens of seventh and the double-glued lens of eighth from the coaxial order of arranging of a plurality of between projection face piece.
Preferably, the projection lens further comprises a diaphragm surface disposed between the fifth cemented doublet and the sixth positive lens.
Furthermore, a reflector is arranged between the eighth double-cemented lens and the optical axis of the image plane of the projection lens, and the reflector and the main shaft of the lens form an angle of 45 degrees, so that the main shaft of the image plane and the main shaft of the lens form a right angle.
Further, the focal length of the first negative meniscus lens is between-30 mm and-10 mm; the focal length of the second negative meniscus lens is between-20 mm and-10 mm; the focal length of the third double-cemented lens is between-70 mm and-40 mm; the focal length of the fourth positive lens is between 20mm and 40 mm; the focal length of the fifth double-cemented lens is between-30 mm and-10 mm; the focal length of the sixth positive lens is between 10mm and 20 mm; the focal length of the seventh double cemented lens is between 30mm and 60 mm; the focal length of the eighth double cemented lens is between 40mm and 70 mm.
Further, the refractive index of the first negative meniscus lens is between 1.9 and 2.05; the refractive index of the second negative meniscus lens is between 1.75 and 1.85; in the third double cemented lens, the refractive index of the concave lens close to the second negative meniscus lens is between 1.85 and 1.95, and the refractive index of the convex lens close to the fourth positive lens is between 1.60 and 1.70; the refractive index of the fourth positive lens is between 1.80 and 1.95; in the fifth double cemented lens, the refractive index of the concave lens close to the fourth positive lens is between 1.80 and 1.90, and the refractive index of the positive lens close to the sixth positive lens is between 1.60 and 1.75; the refractive index of the sixth positive lens is between 1.50 and 1.60; in the seventh double cemented lens, the refractive index of the concave lens close to the sixth positive lens is between 1.55 and 1.70, and the refractive index of the convex lens close to the eighth double cemented lens is between 1.45 and 1.55; in the eighth double cemented lens, the refractive index of the negative meniscus lens close to the seventh double cemented lens is between 1.75 and 1.85, and the refractive index of the convex lens is between 1.45 and 1.55.
The utility model has the advantages that:
1. the utility model provides a super wide angle 200 degrees, F-Theta distortion are less than 1%, focal length 2.7mm, and image plane diameter is 9.4 mm's fisheye lens. The lens is a photographic objective lens with simple structure and cost control and optimization;
2. the utility model discloses a based on the optics imaging principle, use optics design software to carry out the optimal design that the structure reaches the aberration repeatedly to projection objective.
3. The fisheye lens is a reverse-distance objective lens with a diaphragm as a boundary, a negative lens group in front and a positive lens group in back, the lens with a similar structure is selected as an initial structure according to the structure, the size of an image surface is changed, and finally the design of a projection lens with excellent image quality is achieved by changing and increasing glass materials, zooming and aberration control.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is an MTF graph of the present invention;
fig. 3 is a dot-sequence diagram of the present invention.
In the figure: 1. an image plane; 2. a first negative meniscus lens; 3. a second negative meniscus lens; 4. a third cemented doublet; 5. a fourth positive lens; 6. a fifth cemented doublet; 7. a sixth positive lens; 8. a seventh cemented doublet; 9. an eighth doublet; 10. a diaphragm surface; 11. a mirror.
Detailed Description
The embodiments of the present invention will be further explained with reference to the accompanying drawings.
From fig. 1 the utility model relates to a fisheye lens, including the projection lens body, the projection lens is including locating the lens subassembly of the coaxial setting of a plurality of between projection face and the image plane 1, the lens subassembly is first negative meniscus lens 2, second negative meniscus lens 3, third double-cemented lens 4, fourth positive lens 5, fifth double-cemented lens 6, sixth positive lens 7, seventh double-cemented lens 8 and eighth double-cemented lens 9 from the coaxial order of arranging of a plurality of between projection face piece to image plane piece.
The projection lens comprises a diaphragm surface 10 arranged between a fifth double cemented lens 6 and a sixth positive lens 7.
The projection lens is provided with a reflector 11 between the eighth double-cemented lens 9 and the optical axis of the image plane 1, and the reflector and the lens main shaft form an angle of 45 degrees, so that the image plane main shaft and the lens main shaft form a right angle.
The focal length of the first negative meniscus lens is between-30 mm and-10 mm; the focal length of the second negative meniscus lens is between-20 mm and-10 mm; the focal length of the third double-cemented lens is between-70 mm and-40 mm; the focal length of the fourth positive lens is between 20mm and 40 mm; the focal length of the fifth double-cemented lens is between-30 mm and-10 mm; the focal length of the sixth positive lens is between 10mm and 20 mm; the focal length of the seventh double cemented lens is between 30mm and 60 mm; the focal length of the eighth double cemented lens is between 40mm and 70 mm.
And the refractive index of the first negative meniscus lens is between 1.9 and 2.05; the refractive index of the second negative meniscus lens is between 1.75 and 1.85; in the third double cemented lens, the refractive index of the concave lens close to the second negative meniscus lens is between 1.85 and 1.95, and the refractive index of the convex lens close to the fourth positive lens is between 1.60 and 1.70; the refractive index of the fourth positive lens is between 1.80 and 1.95; in the fifth double cemented lens, the refractive index of the concave lens close to the fourth positive lens is between 1.80 and 1.90, and the refractive index of the positive lens close to the sixth positive lens is between 1.60 and 1.75; the refractive index of the sixth positive lens is between 1.50 and 1.60; in the seventh double cemented lens, the refractive index of the concave lens close to the sixth positive lens is between 1.55 and 1.70, and the refractive index of the convex lens close to the eighth double cemented lens is between 1.45 and 1.55; in the eighth double cemented lens, the refractive index of the negative meniscus lens close to the seventh double cemented lens is between 1.75 and 1.85, and the refractive index of the convex lens is between 1.45 and 1.55.
The curvature radius, material and thickness of each lens and the distance between the lenses are modified to achieve the optimization of aberration.
The following provides the parameters of the embodiment of the optical system of the fisheye lens of the present invention.
| Surface | Type | | Thickness | Glass | |
| 1 | Aspherical surface | 52.805 | 11.199 | 2.00,25.4 | |
| 2 | Aspherical surface | 13.737 | 5.831 | ||
| 3 | 38.720 | 2.993 | 1.80,46.6 | ||
| 4 | 8.634 | 6.553 | |||
| 5 | -13.156 | 1.052 | 1.90,37.1 | ||
| 6 | 19.493 | 15.348 | 1.65,33.7 | ||
| 7 | -18.630 | 0.190 | |||
| 8 | 62.411 | 2.934 | 1.88,39.2 | ||
| 9 | -43.452 | 13.413 | |||
| 10 | -31.237 | 3.771 | 1.86,36.6 | ||
| 11 | Diaphragm | 4.647 | 1.952 | 1.67,32.2 | |
| 12 | -37.892 | 0.049 | |||
| 13 | Diaphragm | infinity | 0.156 | ||
| 14 | 8.343 | 1.524 | 1.55,63.3 | ||
| 15 | -53.517 | 0.505 | |||
| 16 | -22.949 | 1.633 | 1.62,36.3 | ||
| 17 | 10.479 | 3.277 | 1.50,81.6 | ||
| 18 | -8.911 | 0.321 | |||
| 19 | 11.066 | 0.500 | 1.81,40.9 | ||
| 20 | 5.092 | 2.656 | 1.50,81.6 | ||
| 21 | -95.980 | 9.981 | |||
| 22 | Image plane | infinity | 0.000 |
Finally obtaining the fish-eye lens with the ultra-wide angle of 200 degrees, the F-Theta distortion of less than 1 percent, the focal length of 2.7mm and the image surface diameter of 9.4 mm.
FIG. 2 is a MTF graph of the present invention, wherein the MTF curves of the respective fields under the 204lp/mm line pair are compacted into a bundle of curves greater than 0.23, which shows that the image formed by the lens is clear and uniform.
The embodiment of the utility model discloses an image plane diameter 9.4mm,204lp/mm correspond the pixel size and be 2.45 microns, so 204lp/mm line is to the lower, and the minimum square that contains the image plane circle is 3836 × 3836 pixels.
As shown in fig. 3, the dot-sequence chart of the present invention shows that the average diffuse spot radius of the dot-sequence chart under each field of view is less than 3.835 microns, and the image quality is good.
Claims (5)
1. The utility model provides a fisheye lens, includes the projection lens body, its characterized in that: the projection lens comprises a plurality of coaxially arranged lens components arranged between a projection surface and an image surface, and the lens components are a first negative meniscus lens, a second negative meniscus lens, a third double-cemented lens, a fourth positive lens, a fifth double-cemented lens, a sixth positive lens, a seventh double-cemented lens and an eighth double-cemented lens in sequence from the projection surface to the image surface.
2. A fish-eye lens according to claim 1, characterized in that: the projection lens further comprises a diaphragm surface arranged between the fifth double-cemented lens and the sixth positive lens.
3. A fish-eye lens according to claim 1, characterized in that: and a reflector is arranged between the eighth double-cemented lens and the optical axis of the image plane of the projection lens, and the reflector and the main shaft of the lens form an angle of 45 degrees, so that the main shaft of the image plane and the main shaft of the lens form a right angle.
4. A fish-eye lens according to claim 1, characterized in that:
the focal length of the first negative meniscus lens is between-30 mm and-10 mm;
the focal length of the second negative meniscus lens is between-20 mm and-10 mm;
the focal length of the third double-cemented lens is between-70 mm and-40 mm;
the focal length of the fourth positive lens is between 20mm and 40 mm;
the focal length of the fifth double-cemented lens is between-30 mm and-10 mm;
the focal length of the sixth positive lens is between 10mm and 20 mm;
the focal length of the seventh double cemented lens is between 30mm and 60 mm;
the focal length of the eighth double cemented lens is between 40mm and 70 mm.
5. A fish-eye lens according to claim 1, characterized in that:
the refractive index of the first negative meniscus lens is between 1.9 and 2.05;
the refractive index of the second negative meniscus lens is between 1.75 and 1.85;
in the third double cemented lens, the refractive index of the concave lens close to the second negative meniscus lens is between 1.85 and 1.95, and the refractive index of the convex lens close to the fourth positive lens is between 1.60 and 1.70;
the refractive index of the fourth positive lens is between 1.80 and 1.95;
in the fifth double cemented lens, the refractive index of the concave lens close to the fourth positive lens is between 1.80 and 1.90, and the refractive index of the positive lens close to the sixth positive lens is between 1.60 and 1.75;
the refractive index of the sixth positive lens is between 1.50 and 1.60;
in the seventh double cemented lens, the refractive index of the concave lens close to the sixth positive lens is between 1.55 and 1.70, and the refractive index of the convex lens close to the eighth double cemented lens is between 1.45 and 1.55;
in the eighth double cemented lens, the refractive index of the negative meniscus lens close to the seventh double cemented lens is between 1.75 and 1.85, and the refractive index of the convex lens is between 1.45 and 1.55.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020008652.0U CN211123456U (en) | 2020-01-03 | 2020-01-03 | Fisheye lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020008652.0U CN211123456U (en) | 2020-01-03 | 2020-01-03 | Fisheye lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211123456U true CN211123456U (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020008652.0U Active CN211123456U (en) | 2020-01-03 | 2020-01-03 | Fisheye lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211123456U (en) |
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2020
- 2020-01-03 CN CN202020008652.0U patent/CN211123456U/en active Active
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