CN211627927U - Short-focus wide-angle day-night confocal lens - Google Patents
Short-focus wide-angle day-night confocal lens Download PDFInfo
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- CN211627927U CN211627927U CN202020488214.9U CN202020488214U CN211627927U CN 211627927 U CN211627927 U CN 211627927U CN 202020488214 U CN202020488214 U CN 202020488214U CN 211627927 U CN211627927 U CN 211627927U
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Abstract
The utility model discloses a short-focus wide-angle day and night confocal lens, which comprises a confocal lens; the confocal lens is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from an object plane to an image plane along an optical axis, the object plane side of the first lens is a convex surface, and the image plane side of the first lens is a concave surface; the object side of the second lens is a concave 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 is a convex surface; the object plane side of the fourth lens is a concave surface, and the image plane side of the fourth lens is a concave surface; the object plane side of the fifth lens is a convex surface, and the image plane side of the fifth lens is a convex surface; the sixth lens element has a convex object surface side and a convex image surface side. The utility model has the advantages that: six lenses are sequentially arranged from an object plane to an image plane along an optical axis, so that the TTL of the lens is 11.8mm, the near-infrared imaging effect is good, the field angle of a day-night confocal lens is considered, the chromatic aberration of a short-focus lens is small, and the day-night confocal effect is improved.
Description
Technical Field
The utility model relates to a confocal camera lens specifically is a confocal camera lens of short burnt wide angle day night belongs to optical system and the module technical field that makes a video recording of using thereof.
Background
In the security field, a network camera is a common device in a security system, a lens is a main component of the network camera, the performance of the lens directly affects the imaging quality and the imaging visual field, as the technical index requirements of the security system are continuously improved, how to improve the remote night monitoring quality becomes a big problem of the security industry, and a day and night confocal lens is visible light and near infrared of 850nm to achieve a good imaging effect.
The field angle of the existing day and night confocal lens is generally below 70 degrees, the field angle of the day and night confocal lens is slightly small, the chromatic aberration of the short-focus lens is large, and the day and night confocal effect is poor.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a short-focus wide-angle day-night confocal lens to solve the above problems.
The utility model discloses a following technical scheme realizes above-mentioned purpose: a short-focus wide-angle day and night confocal lens comprises a confocal lens; the confocal lens consists of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from an object plane to an image plane along an optical axis, the object plane side of the first lens is a convex surface, and the image plane side of the first lens is a concave surface; the object side of the second lens is a concave surface, and the image side of the second lens is a concave surface; the object plane side of the third lens is a convex surface, and the image plane side of the third lens is a convex surface; the object plane side of the fourth lens is a concave surface, and the image plane side of the fourth lens is a concave surface; the object plane side of the fifth lens is a convex surface, and the image plane side of the fifth lens is a convex surface; the object plane side of the sixth lens is a convex surface, and the image plane side of the sixth lens is a convex surface.
As a further aspect of the present invention: the focal length of the second lens is f2, the focal length of the third lens is f4, and the focal length of the second lens and the focal length of the third lens meet the following conditions:
-2.63<(f2/f3)<-1.07。
as a further aspect of the present invention: the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, and the focal length of the fourth lens and the focal length of the fifth lens meet the following conditions:
-3.14<(f5/f4)<-1.37。
as a further aspect of the present invention: the fourth lens and the fifth lens are a group of cemented lenses.
As a further aspect of the present invention: the total optical length ttl of the confocal lens optical system satisfies the following condition:
ttl≤12mm。
as a further aspect of the present invention: the field angle 2 omega of the confocal lens optical system is between 85 and 95 degrees.
As a further aspect of the present invention: the total focal length of the confocal lens is f, the focal length of the sixth lens is f6, and the total focal length of the confocal lens and the focal length of the sixth lens meet the following conditions:
0.86<(f6/f)<1.84。
as a further aspect of the present invention: and protective glass is arranged between the sixth lens and the image plane.
The utility model has the advantages that: the short-focus wide-angle day and night confocal lens is reasonable in design, is formed by sequentially arranging six lenses from an object plane to an image plane along an optical axis, enables the TTL of the lens to be 11.8mm, is good in near-infrared imaging effect, can give consideration to the field angle of the day and night confocal lens, is small in chromatic aberration, and further improves the day and night confocal effect.
Drawings
FIG. 1 is a schematic view of the lens structure of the present invention;
fig. 2 is a first schematic analysis view of the present invention;
FIG. 3 is a schematic diagram of 850nm infrared resolution of the present invention;
FIG. 4 is a schematic view of the field curvature of the present invention;
fig. 5 is a schematic diagram of distortion of the present invention;
fig. 6 is a schematic diagram of the relative illumination of the present invention.
In the figure: 1. a first lens, 2, a second lens, 3, a third lens, 4, a fourth lens, 5, a fifth lens, and 6, a sixth lens.
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.
Referring to fig. 1 to 6, a short-focus wide-angle day-night confocal lens includes a confocal lens; the confocal lens is composed of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and a sixth lens 6; the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are arranged in sequence from an object plane to an image plane along an optical axis, the object plane side of the first lens 1 is a convex surface, and the image plane side of the first lens is a concave surface; the object surface side of the second lens 2 is a concave surface, and the image surface side is a concave surface; the object surface side of the third lens 3 is a convex surface, and the image surface side is a convex surface; the object plane side of the fourth lens 4 is a concave surface, and the image plane side is a concave surface; the object surface side of the fifth lens 5 is a convex surface, and the image surface side is a convex surface; the sixth lens element 6 has a convex object surface side and a convex image surface side.
Further, in the embodiment of the present invention, the focal length of the second lens 2 is f2, the focal length of the third lens 3 is f4, and the focal length of the second lens (2 and the focal length of the third lens 3 satisfy the following conditions:
-2.63<(f2/f3)<-1.07。
further, in the embodiment of the present invention, the focal length of the fourth lens element 4 is f4, the focal length of the fifth lens element 5 is f5, and the focal length of the fourth lens element 4 and the focal length of the fifth lens element 5 satisfy the following conditions:
-3.14<(f5/f4)<-1.37。
further, in the embodiment of the present invention, the fourth lens 4 and the fifth lens 5 are a set of cemented lenses.
Further, in the embodiment of the present invention, the total optical length ttl of the confocal lens optical system satisfies the following condition:
ttl≤12mm。
further, in the embodiment of the present invention, the field angle 2 ω of the confocal lens optical system is between 85 ° and 95 °.
Further, in the embodiment of the present invention, the total focal length of the confocal lens is f, the focal length of the sixth lens 6 is f6, and the total focal length of the confocal lens and the focal length of the sixth lens 6 satisfy the following conditions:
0.86<(f6/f)<1.84。
further, in the embodiment of the present invention, a protection glass is further disposed between the sixth lens element 6 and the image plane.
The working principle is as follows: when the short-focus wide-angle day and night confocal lens is used, six lenses are sequentially arranged from an object plane to an image plane along an optical axis, the TTL of the lens is 11.8mm, the near-infrared imaging effect is good, the day and night confocal lens field angle can be considered, the short-focus lens has small chromatic aberration, and the day and night confocal effect is further improved.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A short-focus wide-angle day and night confocal lens comprises a confocal lens; the method is characterized in that: the confocal lens is composed of a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5) and a sixth lens (6); the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5) and the sixth lens (6) are arranged in sequence from an object plane to an image plane along an optical axis, the object plane side of the first lens (1) is a convex surface, and the image plane side is a concave surface; the object surface side of the second lens (2) is a concave surface, and the image surface side is a concave surface; the object surface side of the third lens (3) is a convex surface, and the image surface side is a convex surface; the object surface side of the fourth lens (4) is a concave surface, and the image surface side is a concave surface; the object surface side of the fifth lens (5) is a convex surface, and the image surface side is a convex surface; the object surface side of the sixth lens (6) is a convex surface, and the image surface side is a convex surface.
2. The short-focus wide-angle day-night confocal lens according to claim 1, wherein: the focal length of the second lens (2) is f2, the focal length of the third lens (3) is f4, and the focal length of the second lens (2) and the focal length of the third lens (3) meet the following conditions:
-2.63<(f2/f3)<-1.07。
3. the short-focus wide-angle day-night confocal lens according to claim 1, wherein: the focal length of the fourth lens (4) is f4, the focal length of the fifth lens (5) is f5, and the focal length of the fourth lens (4) and the focal length of the fifth lens (5) meet the following conditions:
-3.14<(f5/f4)<-1.37。
4. the short-focus wide-angle day-night confocal lens according to claim 1, wherein: the fourth lens (4) and the fifth lens (5) are a group of cemented lenses.
5. The short-focus wide-angle day-night confocal lens according to claim 1, wherein: the total optical length ttl of the confocal lens optical system satisfies the following condition:
ttl≤12mm。
6. the short-focus wide-angle day-night confocal lens according to claim 1, wherein: the field angle 2 omega of the confocal lens optical system is between 85 and 95 degrees.
7. The short-focus wide-angle day-night confocal lens according to claim 1, wherein: the total focal length of the confocal lens is f, the focal length of the sixth lens (6) is f6, and the total focal length of the confocal lens and the focal length of the sixth lens (6) meet the following conditions:
0.86<(f6/f)<1.84。
8. the short-focus wide-angle day-night confocal lens according to claim 1, wherein: and protective glass is arranged between the sixth lens (6) and the image plane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020488214.9U CN211627927U (en) | 2020-04-07 | 2020-04-07 | Short-focus wide-angle day-night confocal lens |
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| CN202020488214.9U CN211627927U (en) | 2020-04-07 | 2020-04-07 | Short-focus wide-angle day-night confocal lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118393705A (en) * | 2024-06-27 | 2024-07-26 | 江西联益光学有限公司 | Day and night confocal lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118393705A (en) * | 2024-06-27 | 2024-07-26 | 江西联益光学有限公司 | Day and night confocal lens |
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