CN112698474B - Ultra-wide angle lens - Google Patents
Ultra-wide angle lens Download PDFInfo
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- CN112698474B CN112698474B CN201911013317.8A CN201911013317A CN112698474B CN 112698474 B CN112698474 B CN 112698474B CN 201911013317 A CN201911013317 A CN 201911013317A CN 112698474 B CN112698474 B CN 112698474B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
An ultra-wide angle lens comprises a first lens, a second lens, a third lens, an aperture diaphragm, a fourth lens, a fifth lens and a sixth lens in sequence from an object side to an image side along an optical axis, wherein the focal power of the first lens is negative; the focal power of the second lens is negative; the focal power of the third lens is positive; the aperture diaphragm is arranged between the third lens and the fourth lens; the focal power of the fourth lens is positive; the focal power of the fifth lens is positive; the focal power of the sixth lens is negative; the fifth lens and the sixth lens form a cemented lens; the total optical length TTL of the ultra-wide-angle lens meets the following requirements: TTL is not less than 14.5mm and not more than 15.5 mm; the field angle of the ultra-wide angle lens is larger than 180 degrees. The ultra-wide-angle lens has the advantages of short total length and light volume, adopts a mode of combining an independent lens and a cemented lens, and ensures that the ultra-wide-angle lens has a simple structure, the lens is relatively easy to process, and the material used by the lens is relatively cheap, thereby reducing the cost.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to an ultra-wide-angle lens.
Background
With the rapid development of intelligent communication equipment and the popularization of vehicle-mounted monitoring, more and more users and occasions need to obtain images with wider field angles, and the requirement and the day of wide-angle lenses are increased. Many photographic products have a smaller and smaller assembly space for the lens in the structure, which requires that the wide-angle lens has a smallest possible optical total length in addition to a largest possible field angle, and ensures clear imaging.
In the prior art, a plurality of lenses adopting a 4G structure are small and exquisite in structure, can achieve a wide angle of 120-150 degrees, but are limited by optical aberration, and are difficult to achieve a 170-degree super-wide angle.
By adopting the aspheric surface technology, a wide-angle lens with a larger visual angle can be manufactured under the same 4G structure, but the aspheric surface processing difficulty is large, the glass aspheric surface processing and detecting technology is not yet generalized, and the equipment cost is very high.
The molded plastic aspheric surface can realize large-scale mass production and has objective cost, but the performance is greatly influenced by the environment, the working range is not ideal between minus 45 ℃ and plus 80 ℃, temperature drift can occur, the image surface is not clear, and the requirement of high-definition quality of the lens can not be met.
Some users prefer the effect of the lens appearance similar to the fish eye, and the design of the wide-angle lens is difficult to increase because the exposed surface of the wide-angle lens needs to be designed into a super-convex spherical surface with a large curvature.
Patent CN105068218A discloses an ultra-wide angle lens, but the total optical length is greater than 20mm, the field angle is less than 180 °, and the requirement for a panoramic angle of 180 ° or more cannot be satisfied.
Disclosure of Invention
The invention aims to solve the technical problem of providing a wide-angle lens which is long in optical total length, large in field angle, low in cost and clear in imaging, so as to solve the problems of complex structure, high cost and short length of the existing ultra-wide-angle lens.
In order to solve the above technical problems, the technical solution adopted by the present invention is to provide an ultra-wide angle lens, which sequentially includes a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens and a sixth lens along an optical axis from an object side to an image side, wherein an optical power of the first lens is negative; the focal power of the second lens is negative; the focal power of the third lens is positive; the aperture diaphragm is arranged between the third lens and the fourth lens; the focal power of the fourth lens is positive; the focal power of the fifth lens is positive; the focal power of the sixth lens is negative; the fifth lens and the sixth lens form a cemented lens; the ultra-wide-angle lens is characterized in that the total optical length TTL of the ultra-wide-angle lens meets the following requirements: TTL is not less than 14.5mm and not more than 15.5 mm; the field angle of the ultra-wide angle lens is larger than 180 degrees.
In the ultra-wide angle lens provided by the invention, the focal length f56 of the cemented lens meets the following condition: f56 is not less than 6.15mm and not more than 11.82 mm.
In the ultra-wide angle lens provided by the present invention,
the object side of the first lens is a convex surface, and the image side of the first lens is a concave surface;
the object side of the second lens is a convex surface, and the image side of the second lens is a concave surface;
the object side of the third lens is a convex surface, and the image side of the third lens is a concave surface;
the object side of the fourth lens is a concave surface, and the image side of the fourth lens is a convex surface;
the fifth lens is a biconvex surface;
the object side of the sixth lens is a concave surface, and the image side of the sixth lens is a convex surface.
In the ultra-wide-angle lens provided by the invention, the following conditional expressions are satisfied:
-0.38≤f/f1≤-0.25；
-0.70≤f/f2≤-0.60；
0.30≤f/f3≤0.40；
0.40≤f/f4≤0.50；
f/f56 is more than or equal to 0.15 and less than or equal to 0.20; wherein the content of the first and second substances,
f is the focal length of the whole system; f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; f56 is the focal length of the cemented lens.
In the ultra-wide-angle lens provided by the invention, the following conditional expressions are satisfied:
| ap1/R1| > 0.93; wherein the content of the first and second substances,
ap1 is the effective clear aperture of the first lens at the object side surface, and R1 is the radius of curvature of the first lens at the object side surface.
In the super wide-angle lens provided by the invention, the super wide-angle lens further comprises a parallel plate arranged on the image side of the sixth lens along the optical axis.
In the super wide-angle lens provided by the invention, the super wide-angle lens further comprises a protective glass arranged on the image side of the parallel plates along the optical axis.
The implementation of the ultra-wide angle lens provided by the invention can achieve the following beneficial effects:
1) the problems that the existing ultra-wide angle lens is complex in structure, high in cost and short in length are solved;
2) the field angle is larger than 180 degrees, and the panoramic camera can be conveniently spliced;
3) the optical total length is less than 15.5mm, so that the assembly space reserved by structural design can be greatly saved;
4) the method can be used for intelligent household products such as vehicle-mounted, monitoring and sweeping robots and slam application of AR/VR;
5) the lens is made of glass, so that temperature drift is avoided, the lens is easy to process, the cost is low, and the requirement of high-definition quality of the lens can be met.
6) The appearance has the effect similar to fish eyes.
Drawings
FIG. 1 is a system diagram of an ultra-wide angle lens according to a preferred embodiment of the present invention;
FIG. 2 is a MTF graph of the super-wide-angle lens shown in FIG. 1;
FIG. 3 is a defocus graph of the ultra-wide-angle lens shown in FIG. 1;
FIG. 4 is a graph of curvature of field and distortion of the ultra-wide angle lens of FIG. 1;
fig. 5 is a vertical axis chromatic aberration diagram of the ultra-wide-angle lens shown in fig. 1.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a preferred embodiment of an ultra-wide-angle lens, wherein the F of the ultra-wide-angle lens is 2.12mm, the F/NO is 2.4, the 2 omega is 190 degrees, and the TTL is 15.4 mm.
As shown in fig. 1, the ultra-wide angle lens includes a first lens L1, a second lens L2, a third lens L3, an aperture stop S7, a fourth lens L4, a fifth lens L5, a sixth lens L6, a parallel plate L7, and a protective glass L8, which are arranged in this order from the object side to the image side along the optical axis. Wherein, the focal power of the first lens L1 is negative; the first lens element L1 has a convex object side S1 and a concave image side S2. The power of the second lens L2 is negative; the second lens L2 has a convex object side S3 and a concave image side S4. The power of the third lens L3 is positive; the third lens element L3 has a convex object side S5 and a concave image side S6. The power of the fourth lens L4 is positive; the fourth lens element L4 has a concave object side S8 and a convex image side S9. The aperture stop S7 is located between the third lens L3 and the fourth lens L4. The power of the fifth lens L5 is positive; both the object side S10 and the image side S11 of the fifth lens L5 are biconvex. The power of the sixth lens L6 is negative; the sixth lens element L6 has a concave object side S12 and a convex image side S13. The fifth lens L5 and the sixth lens L6 constitute a cemented lens. The parallel plate L7 may be a flat glass plate with both the object side S14 and the image side S15 being planar, and the object side S14 and the image side S15 of the parallel plate L7 being parallel to each other. The protective glass L8 may be a flat glass plate, in which the object side S16 and the image side S17 are both flat, and the object side S16 and the image side S17 of the protective glass L8 are parallel to each other.
In this embodiment, the first lens L1, the second lens L2, the third lens L3, the aperture stop S7, the fourth lens L4, the fifth lens L5, the sixth lens L6, the parallel plate L7, and the protective glass L8 are all made of glass. So, guarantee there is not the temperature drift in super wide angle camera lens, and easily processing, low cost can satisfy the requirement of camera lens high definition quality.
Further, the ultra-wide angle lens satisfies the following conditional expression:
-0.38≤f/f1≤-0.25；
-0.70≤f/f2≤-0.60；
0.30≤f/f3≤0.40；
0.40≤f/f4≤0.50；
0.15≤f/f56≤0.20；
wherein f is the focal length of the whole system; f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; f56 is the focal length of the cemented lens.
Further, the ultra-wide angle lens further satisfies the following conditional expression: | ap1/R1| > 0.93; where ap1 is the effective clear aperture of the first lens L1 on the object side surface, and R1 is the radius of curvature of the first lens L1 on the object side surface. Therefore, the appearance of the ultra-wide angle lens has the effect similar to a fisheye.
The detailed parameters of the ultra-wide-angle lens are as follows:
the MTF graph of the ultra-wide angle lens provided by the present embodiment is shown in fig. 2; the defocus graph is shown in fig. 3; the field curvature, distortion plot is shown in fig. 4; the vertical axis color difference plot is shown in fig. 5. Thus, the excellent performance of the ultra-wide angle lens is demonstrated by the detection data.
In other embodiments, the total optical length TTL of the ultra-wide angle lens can be 14.5mm, 15.5mm, or any value between 14.5mm and 15.5mm, such as 14.6mm, 14.7mm, 14.8mm, 14.9mm, 15.0mm, 15.1mm, 15.2mm, 15.3mm, and so on.
The ultra-wide-angle lens has the advantages of short total length and light volume, and the ultra-wide-angle lens has a simple structure, is relatively easy to process and is relatively cheap in materials due to the adoption of a mode of combining the independent lens and the cemented lens and reasonable optical power distribution, so that the cost is reduced.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. An ultra-wide angle lens comprises a first lens, a second lens, a third lens, an aperture diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the focal power of the first lens is negative; the focal power of the second lens is negative; the focal power of the third lens is positive; the aperture diaphragm is arranged between the third lens and the fourth lens; the focal power of the fourth lens is positive; the focal power of the fifth lens is positive; the focal power of the sixth lens is negative; the fifth lens and the sixth lens form a cemented lens; the ultra-wide-angle lens is characterized in that the total optical length TTL of the ultra-wide-angle lens meets the following requirements: TTL is not less than 14.5mm and not more than 15.5 mm; the field angle of the ultra-wide-angle lens is larger than 180 degrees; the ultra-wide-angle lens meets the following conditional expression:
-0.38≤f/f1≤-0.25；
-0.70≤f/f2≤-0.60；
0.30≤f/f3≤0.40；
0.40≤f/f4≤0.50；
f/f56 is more than or equal to 0.15 and less than or equal to 0.20; wherein the content of the first and second substances,
f is the focal length of the whole system; f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; f56 is the focal length of the cemented lens.
2. The ultra-wide angle lens of claim 1, wherein the focal length f56 of the cemented lens satisfies the following condition: f56 is not less than 6.15mm and not more than 11.82 mm.
3. The ultra-wide angle lens of claim 1,
the object side of the first lens is a convex surface, and the image side of the first lens is a concave surface;
the object side of the second lens is a convex surface, and the image side of the second lens is a concave surface;
the object side of the third lens is a convex surface, and the image side of the third lens is a concave surface;
the object side of the fourth lens is a concave surface, and the image side of the fourth lens is a convex surface;
the fifth lens is a biconvex surface;
the object side of the sixth lens is a concave surface, and the image side of the sixth lens is a convex surface.
4. The ultra-wide angle lens according to claim 1, wherein the following conditional expression is satisfied:
| ap1/R1| > 0.93; wherein the content of the first and second substances,
ap1 is the effective clear aperture of the first lens at the object side surface, and R1 is the radius of curvature of the first lens at the object side surface.
5. The ultra-wide angle lens of claim 1, further comprising a parallel plate disposed on an image side of the sixth lens along an optical axis.
6. The ultra-wide angle lens of claim 5, further comprising a cover glass disposed along an optical axis on an image side of the parallel plates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911013317.8A CN112698474B (en) | 2019-10-23 | 2019-10-23 | Ultra-wide angle lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911013317.8A CN112698474B (en) | 2019-10-23 | 2019-10-23 | Ultra-wide angle lens |
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| CN112698474A CN112698474A (en) | 2021-04-23 |
| CN112698474B true CN112698474B (en) | 2022-03-22 |
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| CN103499874B (en) * | 2013-10-29 | 2015-11-18 | 姚学文 | A kind of bugeye lens |
| CN105068218B (en) * | 2015-09-15 | 2018-06-26 | 广东弘景光电科技股份有限公司 | Bugeye lens |
| CN209028284U (en) * | 2018-09-10 | 2019-06-25 | 湖北华鑫光电有限公司 | A kind of million bugeye lenses |
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