CN112666691B - Medium-long-focus low-light-level lens with wide waveband and large image surface and imaging method thereof - Google Patents
Medium-long-focus low-light-level lens with wide waveband and large image surface and imaging method thereof Download PDFInfo
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Abstract
The invention relates to a medium-long-focus low-light-level lens with a wide waveband and a large image plane and an imaging method thereof, wherein the medium-long-focus low-light-level lens comprises the following steps: the lens consists of a front group, a diaphragm, a rear group, a focusing group and an imaging surface which are sequentially arranged from an object side to an image side, wherein the front group consists of a first meniscus lens, a second meniscus lens, a third meniscus lens and a fourth meniscus lens which are sequentially arranged, and the rear group consists of a fifth biconcave lens and a sixth biconvex lens which are sequentially arranged; the focusing group consists of a seventh biconvex lens, an eighth biconvex lens, a ninth biconcave lens, a tenth meniscus lens, an eleventh plano-convex lens and a twelfth plano-concave lens which are sequentially arranged.
Description
Technical Field
The invention relates to a medium-long-focus low-light-level lens with a wide waveband and a large image plane and an imaging method thereof.
Background
At present, scientific technology is different day by day, and imaging detection device spectral response wave band constantly expands, and the receiving area is bigger and bigger, and the pixel size is smaller and smaller. Therefore, the adaptive optical lens is continuously developed towards the characteristics of full spectrum, large image plane, high resolution and the like. The wide-spectrum lens has important significance on miniaturization and light weight of the multispectral technology, more target information can be obtained when the working waveband of the lens is wider and the image plane is larger, and the longer the focal length and the large relative aperture are, the more far the lens can be seen and the more clear the lens can be seen. The long-focus lens with wide band, large image plane and large relative aperture has very important application prospect in civil fields such as security monitoring and the like and military fields such as high-altitude reconnaissance and the like, and the existing lens is difficult to meet market requirements in terms of pixel, performance and cost.
Disclosure of Invention
The invention provides a medium-long-focus low-light-level lens with a wide waveband and a large image surface and an imaging method thereof.
The invention adopts the scheme that the medium-long focus low-light-level lens for solving the technical problem is as follows: the lens consists of a front group, a diaphragm, a rear group, a focusing group and an imaging surface which are sequentially arranged from an object side to an image side, wherein the front group consists of a first meniscus lens with positive focal power, a second meniscus lens with positive focal power, a third meniscus lens with negative focal power and a fourth meniscus lens with positive focal power which are sequentially arranged, and the rear group consists of a fifth biconcave lens with negative focal power and a sixth biconvex lens with positive focal power which are sequentially arranged; the focusing group consists of a seventh double convex lens with positive focal power, an eighth double convex lens with positive focal power, a ninth double concave lens with negative focal power, a tenth meniscus lens with positive focal power, an eleventh plano-convex lens with positive focal power and a twelfth plano-concave lens with negative focal power which are sequentially arranged.
Furthermore, the third meniscus lens and the fourth meniscus lens are closely bonded to form a first bonding group with negative focal power; the fifth biconcave lens and the sixth biconvex lens are sealed and glued to form a second gluing set with negative focal power; the eighth biconvex lens and the ninth biconcave lens are sealed and glued to form a third gluing set with negative focal power; the eleventh plano-convex lens and the twelfth plano-concave lens are in close joint gluing to form a fourth gluing set with positive focal power.
Further, the diaphragm is an iris diaphragm, the maximum diameter of the diaphragm is 63mm, and the minimum diameter of the diaphragm is 4mm.
Further, the air space between the front group and the diaphragm is 4.10mm, the air space between the diaphragm and the rear group is 8.11mm, and the air space between the rear group and the focusing group is 10.55mm.
Further, an air interval between the first meniscus lens and the second meniscus lens is 24.13mm, an air interval between the second meniscus lens and the first cemented group is 3.25mm, an air interval between the second cemented group and the seventh biconvex lens is 10.55mm, an air interval between the seventh biconvex lens and the third cemented group is 0.20mm, an air interval between the third cemented group and the tenth meniscus lens is 5.45mm, and an air interval between the tenth meniscus lens and the fourth cemented group is 0.20mm.
Further, the first meniscus lens uses a glass material having a refractive index greater than 1.9.
Furthermore, the first bonding group and the second bonding group with negative focal power are respectively formed by bonding a low-dispersion glass material and a heavy flint glass material.
Further, a focal length f of the first meniscus lens L1 ', focal length f of second meniscus lens L2 ', focal length f of the first glue combination D1 ', focal length f of the second glue combination D2 ', focal length f of seventh biconvex lens L7 ', focal length f of the third glue combination D3 ', the focal length f of the tenth meniscus lens L10 ', which satisfies the following relationship with the focal length f' of the lens:
an imaging method of a medium-long focus low-light-level lens with a wide waveband and a large image surface comprises the following steps: when light is incident, the light enters the front group, the diaphragm, the rear group and the focusing group in sequence, imaging is carried out on an imaging surface finally, the light is incident from a first meniscus lens of a first lens of the front group, the refractive index of the first meniscus lens is larger, the reduction of the light-passing caliber of a rear-end light path is facilitated, high-level aberration is reduced at the same time, the miniaturization is facilitated, the imaging resolution is improved at the same time, the chromatic aberration, particularly the secondary spectral aberration, is well corrected due to the fact that the first gluing group and the second gluing group are formed by gluing of a low-dispersion glass material and a heavy flint glass material, and the improvement of the imaging quality of the long-focus wide-band lens is facilitated.
Compared with the prior art, the invention has the following beneficial effects: the front end lens of the light path is made of a high-refractive-index material, the clear aperture of the rear end light path is reduced, high-level aberration is reduced, the cemented combination lens is made of low-dispersion crown glass and heavy flint glass, chromatic aberration, particularly secondary spectral aberration, is effectively corrected, the imaging resolution of the lens in a wide wavelength band range of 500nm to 1000nm is improved, the imaging target surface of the lens is large, the detection range is wide, and the structure is compact.
Drawings
The invention is further described with reference to the following figures.
FIG. 1 is a diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a graph of a near infrared band MTF curve according to an embodiment of the present invention;
FIG. 3 is a graph of MTF in the visible light band according to an embodiment of the present invention.
In the figure: 1-a first meniscus lens; 2-a second meniscus lens; 3-a third meniscus lens; 4-a fourth meniscus lens; 5-a fifth biconcave lens; 6-a sixth biconvex lens; 7-a seventh biconvex lens; 8-an eighth lenticular lens; 9-ninth biconcave lens; 10-tenth meniscus lens; 11-eleventh plano-convex lens; 12-a twelfth plano-concave lens; 13-imaging surface; a-front group; b, a diaphragm; c-rear group; d-focusing group.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1-3, a medium-long-focus low-light-level lens with a wide-band and large image plane: the lens consists of a front group A, a diaphragm B, a rear group C, a focusing group D and an imaging surface 13 which are sequentially arranged from an object side to an image side, wherein the front group consists of a first meniscus lens 1 with positive focal power, a second meniscus lens 2 with positive focal power, a third meniscus lens 3 with negative focal power and a fourth meniscus lens 4 with positive focal power which are sequentially arranged, and the rear group consists of a fifth biconcave lens 5 with negative focal power and a sixth biconvex lens 6 with positive focal power which are sequentially arranged; the focusing group consists of a seventh biconvex lens 7 with positive focal power, an eighth biconvex lens 8 with positive focal power, a ninth biconcave lens 9 with negative focal power, a tenth meniscus lens 10 with positive focal power, an eleventh plano-convex lens 11 with positive focal power and a twelfth plano-concave lens 12 with negative focal power which are arranged in sequence;
the focusing group is moved back and forth while the length of the lens is kept unchanged, so that the lens can clearly image different distant and near targets.
In this embodiment, the third meniscus lens and the fourth meniscus lens are tightly bonded to form a first bonding group with negative power; the fifth biconcave lens and the sixth biconvex lens are sealed and glued to form a second gluing set with negative focal power; the eighth biconvex lens and the ninth biconcave lens are sealed and glued to form a third gluing set with negative focal power; and the eleventh plano-convex lens and the twelfth plano-concave lens are in close joint gluing to form a fourth gluing set with positive focal power.
In this embodiment, the diaphragm is an iris diaphragm, and the maximum diameter of the diaphragm is 63mm and the minimum diameter of the diaphragm is 4mm.
In this embodiment, the air space between the front group and the diaphragm is 4.10mm, the air space between the diaphragm and the rear group is 8.11mm, and the air space between the rear group and the focusing group is 10.55mm.
In this embodiment, an air space between the first meniscus lens and the second meniscus lens is 24.13mm, an air space between the second meniscus lens and the first cemented group is 3.25mm, an air space between the second cemented group and the seventh biconvex lens is 10.55mm, an air space between the seventh biconvex lens and the third cemented group is 0.20mm, an air space between the third cemented group and the tenth meniscus lens is 5.45mm, and an air space between the tenth meniscus lens and the fourth cemented group is 0.20mm.
In this embodiment, the first meniscus lens is made of a glass material having a refractive index greater than 1.9; the light path structure is beneficial to reducing the light-passing aperture of the rear-end light path and simultaneously reducing high-level aberration, and the miniaturization is favorably realized and the imaging resolution is improved.
In this embodiment, the first bonding group and the second bonding group with negative focal power are formed by bonding a low-dispersion glass material and a heavy flint glass material, have a good correction effect on chromatic aberration, particularly on secondary spectral aberration, and are beneficial to improvement of imaging quality of the long-focus broadband lens.
In this embodiment, a focal length f of the first meniscus lens L1 ', focal length f of the second meniscus lens L2 ', focal length f of the first glue combination D1 ', focal length f of the second glue combination D2 ', focal length f of seventh biconvex lens L7 ', focal length f of the third glue combination D3 ', the focal length f of the tenth meniscus lens L10 ', which satisfies the following relationship with the focal length f' of the lens:
a medium-long focus low-light-level lens with a wide waveband and a large image plane is disclosed, and each lens of the lens needs to meet the parameter requirements shown in a table 1.
TABLE 1 lens parameter table
The working wave band of the optical fiber covers 500 nm-1000 nm, the resolution ratio in the near infrared wave band is better than 120lp/mm, and the resolution ratio in the visible light wave band is better than 80lp/mm. The focal length f' =100mm of the lens, and the detection distance is long; the relative aperture is 1/1.1, and the light collecting capability is strong; imaging target surface phi 24mm, large target surface and large detection range
An imaging method of a medium-long-focus low-light-level lens with a wide waveband and a large image plane comprises the following steps: when light is incident, the light enters the front group in sequence, the diaphragm, the rear group, the focusing group, imaging is carried out on an imaging surface finally, the light is incident from a first meniscus lens of a first lens of the front group, the refractive index of the first meniscus lens is larger, the light-transmitting caliber of a rear-end light path is favorably reduced, high-level aberration is reduced at the same time, the light path structure is favorable for realizing miniaturization and improving the imaging resolution ratio at the same time, and the first bonding group and the second bonding group are formed by bonding a low-dispersion glass material and a heavy flint glass material, so that the chromatic aberration, particularly the second-level spectral aberration, is well corrected, and the improvement of the imaging quality of the long-focus broadband lens is favorably realized.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the number is large and cannot be exhaustive, some of the numbers are disclosed to exemplify the technical solutions of the present invention, and the above-mentioned numbers should not be construed as limiting the scope of the present invention.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the use of "first" and "second" is merely for convenience of description to distinguish between elements and components, and the terms do not have a special meaning unless otherwise stated.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding) can, of course, also be replaced by one-piece structures (e.g. manufactured in one piece using a casting process) (unless it is obvious that one-piece processes cannot be used).
In addition, the orientations or positional relationships indicated for indicating the positional relationships such as "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, applied in any of the technical aspects of the present disclosure described above are based on the orientations or positional relationships shown in the drawings and are only for convenience of describing the present disclosure, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as limiting the present disclosure, and the terms used for indicating the shapes applied in any of the technical aspects of the present disclosure described above are meant to include shapes similar, analogous or approximate thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that the above examples are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications of the embodiments of the invention or equivalent substitutions for parts of the technical features are possible; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides a medium-length focus shimmer camera lens of big image plane of broadband which characterized in that: the lens consists of a front group, a diaphragm, a rear group, a focusing group and an imaging surface which are sequentially arranged from an object side to an image side, wherein the front group consists of a first meniscus lens with positive focal power, a second meniscus lens with positive focal power, a third meniscus lens with negative focal power and a fourth meniscus lens with positive focal power which are sequentially arranged, and the rear group consists of a fifth biconcave lens with negative focal power and a sixth biconvex lens with positive focal power which are sequentially arranged; the focusing group consists of a seventh biconvex lens with positive focal power, an eighth biconvex lens with positive focal power, a ninth biconcave lens with negative focal power, a tenth meniscus lens with positive focal power, an eleventh plano-convex lens with positive focal power and a twelfth plano-concave lens with negative focal power which are arranged in sequence; the third meniscus lens and the fourth meniscus lens are tightly connected and glued to form a first gluing group with negative focal power; the fifth biconcave lens and the sixth biconvex lens are sealed and glued to form a second gluing set with negative focal power; the eighth biconvex lens and the ninth biconcave lens are sealed and glued to form a third gluing group with negative focal power; the eleventh plano-convex lens and the twelfth plano-concave lens are sealed and glued to form a fourth gluing set with positive focal power; the refractive index of the glass material used for the first meniscus lens is greater than 1.9;
the diaphragm is an iris diaphragm, the maximum diameter of the diaphragm is 63mm, and the minimum diameter of the diaphragm is 4mm;
the working wave band covers 500 nm-1000 nm; imaging target surface phi is 24mm; lens focal length f' =100mm; relative aperture is 1/1.1; the resolution of the near infrared band is better than 120lp/mm; the resolution of the visible light wave band is better than 80lp/mm.
2. The medium-long-focus micro-optic lens with a wide-band large image plane according to claim 1, wherein: the air interval between the front group and the diaphragm is 4.10mm, the air interval between the diaphragm and the rear group is 8.11mm, and the air interval between the rear group and the focusing group is 10.55mm.
3. The medium-long-focus micro-optic lens with a wide-band large image plane according to claim 2, wherein: the air space between the first meniscus lens and the second meniscus lens is 24.13mm, the air space between the second meniscus lens and the first cemented group is 3.25mm, the air space between the second cemented group and the seventh biconvex lens is 10.55mm, the air space between the seventh biconvex lens and the third cemented group is 0.20mm, the air space between the third cemented group and the tenth meniscus lens is 5.45mm, and the air space between the tenth meniscus lens and the fourth cemented group is 0.20mm.
4. The medium-long-focus micro-optic lens with a wide-band large image plane according to claim 3, wherein: the first bonding group and the second bonding group with negative focal power are respectively formed by bonding a low-dispersion glass material and a heavy flint glass material.
5. The medium-long-focus micro-optic lens with a wide-band large image plane according to claim 4, wherein: focal length f of the first meniscus lens L1 ', focal length f of second meniscus lens L2 ', focal length f of the first glue combination D1 ', focal length f of the second glue combination D2 ', the focal length f of the seventh biconvex lens L7 ', focal length f of the third glue combination D3 ', the focal length f of the tenth meniscus lens L10 ', which satisfies the following relationship with the focal length f' of the lens:
6. an imaging method of the medium-length low-light-level optical lens for a wide-band large image plane, which adopts the medium-length low-light-level optical lens for a wide-band large image plane as claimed in claim 5, wherein: when light is incident, light enters the front group in sequence, the diaphragm, the rear group, the focusing group, imaging is carried out on an imaging surface finally, the light is incident from a first meniscus lens of a first lens of the front group, the refractive index of the first meniscus lens is larger, the light passing caliber of a rear-end light path is favorably reduced, high-grade aberration is reduced simultaneously, the light path structure is favorable for realizing miniaturization and improving imaging resolution simultaneously, the first gluing group and the second gluing group are formed by gluing a low-dispersion glass material and a heavy flint glass material, good correction effect is realized on secondary spectral aberration, and the improvement of the imaging quality of the long-focus broadband lens is favorably realized.
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| CN114236782B (en) * | 2021-11-17 | 2023-04-18 | 中航洛阳光电技术有限公司 | Visible light near-infrared short wave broadband optical system |
| CN114326071B (en) * | 2021-12-14 | 2024-03-19 | 宁波永新光学股份有限公司 | 20-time large numerical aperture flat field apochromatic microscope objective lens |
| CN114488479B (en) * | 2022-01-10 | 2024-04-09 | 合肥埃科光电科技股份有限公司 | Industrial lens with large view field and high resolution front diaphragm |
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