CN212515190U - Super wide angle cat eye camera lens - Google Patents
Super wide angle cat eye camera lens Download PDFInfo
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- CN212515190U CN212515190U CN202021749186.8U CN202021749186U CN212515190U CN 212515190 U CN212515190 U CN 212515190U CN 202021749186 U CN202021749186 U CN 202021749186U CN 212515190 U CN212515190 U CN 212515190U
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Abstract
The utility model discloses a super wide angle cat eye lens, which comprises a first lens element, a second lens element, a third lens element, a diaphragm, a fourth lens element and a fifth lens element from the object space to the image space in sequence, and is characterized in that the first lens element is a meniscus lens with negative focal power convex to the object space; the second lens element is a double concave lens with negative focal power; the third lens element is a meniscus lens with positive focal power convex to the image side; the fourth lens element is a double-concave lens with negative focal power; the fifth lens element is a convex plano-convex lens with positive focal power towards the image side; the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are all glass spherical mirrors. The utility model adopts the spherical design, the technical performance is good, and the cost is low; and correcting off-axis aberration and compensating chromatic aberration of the five lens elements through optimal optical design to obtain the ultra-wide-angle cat-eye lens with high brightness and high MTF value.
Description
Technical Field
The utility model relates to a cat eye camera lens technical field, more specifically the saying so relates to an ultra wide angle cat eye camera lens.
Background
With the development of society, more and more people focus on home security protection, and aiming at the cat eye lens market, the cat eye lens with ultra-wide angle, high brightness and good observation definition becomes a mainstream development trend.
Therefore, how to provide an ultra-wide-angle cat-eye lens capable of meeting the above requirements is a problem that needs to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a super wide angle cat eye camera lens, it has super wide angle, observation effect is good, characteristics such as luminance height and MTF value height.
An ultra-wide-angle cat-eye lens, which comprises a first lens element, a second lens element, a third lens element, a diaphragm, a fourth lens element and a fifth lens element from the object space to the image space in sequence,
the first lens element is a meniscus lens with negative focal power convex to the object;
the second lens element is a biconcave optic having a negative optical power;
the third lens element is a meniscus lens with positive focal power convex to the image side;
the fourth lens element is a double concave lens with negative focal power;
the fifth lens element is a convex plano-convex lens with positive focal power towards the image side;
the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are all glass spherical mirrors.
Preferably, in the above-mentioned ultra-wide-angle cat-eye lens, the first lens element satisfies: nd1 is more than or equal to 1.70 and less than or equal to 1.78; vd1 is more than or equal to 52.62 and less than or equal to 52.72; where Nd1 denotes a refractive index of the first lens, and an abbe number Vd1 of the first lens.
Preferably, in the above-mentioned ultra-wide-angle cat-eye lens, the second lens element satisfies: nd2 is more than or equal to 1.73 and less than or equal to 1.80; 49.56 is less than or equal to Vd2 is less than or equal to 49.65; where Nd2 denotes a refractive index of the second lens, and an abbe number Vd2 of the second lens.
Preferably, in the ultra-wide-angle cat-eye lens described above, the third lens element satisfies: nd3 is more than or equal to 1.76 and less than or equal to 1.85; vd3 is more than or equal to 25.43 and less than or equal to 25.52; nd3 denotes a refractive index of the third lens, and an abbe number Vd3 of the third lens.
Preferably, in the ultra-wide-angle cat-eye lens described above, the fourth lens element satisfies: nd4 is more than or equal to 1.80 and less than or equal to 1.88; 23.75 is less than or equal to Vd4 is less than or equal to 23.83; nd4 denotes a refractive index of the fourth lens, and an abbe number Vd4 of the fourth lens.
Preferably, in the ultra-wide-angle cat-eye lens described above, the fifth lens element satisfies: nd5 is more than or equal to 1.68 and less than or equal to 1.75; vd5 is more than or equal to 53.82 and less than or equal to 53.90; nd5 denotes a refractive index of the fifth lens, and an abbe number Vd5 of the fifth lens.
Preferably, in the above ultra-wide-angle cat-eye lens, the lens satisfies the following condition: the focal length satisfies EFL 10.3 mm; the total lens length meets the TTL of 90.1 plus or minus 0.3 mm; the lens field angle satisfies the DFOV of 180 degrees.
Preferably, in the ultra-wide-angle cat-eye lens, the lens is suitable for the door thickness of 65-90 mm.
Through the technical scheme, compared with the prior art, the utility model adopts the spherical surface design, the processing performance is good, and the material cost is low; and correcting off-axis aberration and compensating chromatic aberration of the five lens elements through optimal optical design to obtain the ultra-wide-angle cat-eye lens with high brightness and high MTF value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a specific structure of the lens of the present invention.
Fig. 2 is a diagram of a light path of the lens of the present invention.
Fig. 3 is a light fan diagram of the lens of the present invention.
Fig. 4 is a schematic diagram of the lens of the present invention.
Fig. 5 is a graph showing MTF resolution of the lens of the present invention.
Fig. 6 is a graph illustrating the chromatic aberration of the lens of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1:
an ultra-wide-angle cat-eye lens, which comprises a first lens element 1, a second lens element 2, a third lens element 3, a diaphragm, a fourth lens element 4 and a fifth lens element 5 from the object space to the image space in sequence,
the first lens element is a meniscus lens with negative focal power convex to the object;
the second lens element is a biconcave optic having a negative optical power;
the third lens element is a meniscus lens with positive focal power convex to the image side;
the fourth lens element is a double concave lens with negative focal power;
the fifth lens element is a convex plano-convex lens with positive focal power towards the image side;
the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are all glass spherical mirrors.
Preferably, the first lens element Nd1 is 1.725; vd 1-52.65.
Preferably, the second lens element Nd2 ═ 1.745; vd 2-49.580.
Preferably, the third lens element Nd3 is 1.785; vd 3-25.455.
Preferably, the fourth lens element Nd4 ═ 1.835; vd 4-23.775.
Preferably, the fifth lens element Nd5 is 1.695; vd 5-53.845.
Preferably, the lens satisfies the following condition: the focal length satisfies EFL 10.3 mm; the total lens length meets the TTL of 90.1 plus or minus 0.3 mm; the angle of view of the lens satisfies the DFOV of 180 °
Preferably, the lens is suitable for the door thickness of 65-90 mm.
Example 2:
an ultra-wide-angle cat-eye lens, which comprises a first lens element 1, a second lens element 2, a third lens element 3, a diaphragm, a fourth lens element 4 and a fifth lens element 5 from the object space to the image space in sequence,
the first lens element is a meniscus lens with negative focal power convex to the object;
the second lens element is a biconcave optic having a negative optical power;
the third lens element is a meniscus lens with positive focal power convex to the image side;
the fourth lens element is a double concave lens with negative focal power;
the fifth lens element is a convex plano-convex lens with positive focal power towards the image side;
the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are all glass spherical mirrors.
Preferably, the first lens element Nd1 ═ 1.745; vd 1-52.715.
Preferably, the second lens element Nd2 ═ 1.765; vd 2-49.625.
Preferably, the third lens element Nd3 is 1.815; vd 3-25.515.
Preferably, the fourth lens element Nd4 is 1.845; vd 4-23.825.
Preferably, the fifth lens element Nd5 is 1.725; vd 5-53.865.
Preferably, the lens satisfies the following condition: the focal length satisfies EFL 10.3 mm; the total lens length meets the TTL of 90.1 plus or minus 0.3 mm; the angle of view of the lens satisfies the DFOV of 180 °
Preferably, the lens is suitable for the door thickness of 65-90 mm.
3-6 provide effective optical performance graphs for this embodiment;
as shown in fig. 5 (MTF resolution graph), it can be seen from the curves that MTF curves of the meridian and the sagittal of each field of view are relatively close, which indicates that the wide-angle lens has relatively good imaging consistency and good imaging contrast in both directions of the meridian (T) and the sagittal (S).
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An ultra-wide-angle cat-eye lens, which comprises a first lens element, a second lens element, a third lens element, a diaphragm, a fourth lens element and a fifth lens element from the object space to the image space in sequence,
the first lens element is a meniscus lens with negative focal power convex to the object;
the second lens element is a biconcave optic having a negative optical power;
the third lens element is a meniscus lens with positive focal power convex to the image side;
the fourth lens element is a double concave lens with negative focal power;
the fifth lens element is a convex plano-convex lens with positive focal power towards the image side;
the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are all glass spherical mirrors.
2. The ultra-wide angle cat-eye lens according to claim 1, wherein said first lens element satisfies: nd1 is more than or equal to 1.70 and less than or equal to 1.78; vd1 is more than or equal to 52.62 and less than or equal to 52.72; where Nd1 denotes a refractive index of the first lens, and an abbe number Vd1 of the first lens.
3. The ultra-wide angle cat-eye lens according to claim 1, wherein said second lens element satisfies: nd2 is more than or equal to 1.73 and less than or equal to 1.80; 49.56 is less than or equal to Vd2 is less than or equal to 49.65; where Nd2 denotes a refractive index of the second lens, and an abbe number Vd2 of the second lens.
4. The ultra-wide angle cat-eye lens according to claim 1, wherein said third lens element satisfies: nd3 is more than or equal to 1.76 and less than or equal to 1.85; vd3 is more than or equal to 25.43 and less than or equal to 25.52; nd3 denotes a refractive index of the third lens, and an abbe number Vd3 of the third lens.
5. The ultra-wide angle cat-eye lens according to claim 1, wherein said fourth lens element satisfies the following condition: nd4 is more than or equal to 1.80 and less than or equal to 1.88; 23.75 is less than or equal to Vd4 is less than or equal to 23.83; nd4 denotes a refractive index of the fourth lens, and an abbe number Vd4 of the fourth lens.
6. The ultra-wide angle cat-eye lens according to claim 1, wherein the fifth lens element satisfies: nd5 is more than or equal to 1.68 and less than or equal to 1.75; vd5 is more than or equal to 53.82 and less than or equal to 53.90; nd5 denotes a refractive index of the fifth lens, and an abbe number Vd5 of the fifth lens.
7. The ultra-wide angle cat-eye lens according to claim 1, wherein the lens satisfies the following condition: the focal length satisfies EFL 10.3 mm; the total lens length meets the TTL of 90.1 plus or minus 0.3 mm; the lens field angle satisfies the DFOV of 180 degrees.
8. The ultra-wide angle cat-eye lens according to claim 1, wherein the lens is suitable for a door thickness of 65-90 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021749186.8U CN212515190U (en) | 2020-08-20 | 2020-08-20 | Super wide angle cat eye camera lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021749186.8U CN212515190U (en) | 2020-08-20 | 2020-08-20 | Super wide angle cat eye camera lens |
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| CN212515190U true CN212515190U (en) | 2021-02-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113960752A (en) * | 2021-10-13 | 2022-01-21 | 江西凤凰光学科技有限公司 | Small-distortion high-resolution fisheye lens |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113960752A (en) * | 2021-10-13 | 2022-01-21 | 江西凤凰光学科技有限公司 | Small-distortion high-resolution fisheye lens |
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