CN114047615A - Wide-spectrum 20-time continuous zoom lens - Google Patents
Wide-spectrum 20-time continuous zoom lens Download PDFInfo
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- CN114047615A CN114047615A CN202111258176.3A CN202111258176A CN114047615A CN 114047615 A CN114047615 A CN 114047615A CN 202111258176 A CN202111258176 A CN 202111258176A CN 114047615 A CN114047615 A CN 114047615A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
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Abstract
The invention provides a wide-spectrum 20-time continuous zoom lens, wherein a front fixed group A with positive focal power is respectively arranged in the optical structure of the lens from left to right; a zoom group B with negative focal power; a compensation group C with positive focal power; a diaphragm; a rear fixed group E with positive focal power; a color filter assembly; the invention has a working spectrum of 400 nm-1000 nm, and can meet the use requirements in daytime and haze environment. The lens zooms from a short focal length to a long focal length and has 20 times of magnification zooming, and the aperture value changes little, so that the brightness change of a monitoring picture is uniform, the exposure time of a camera does not need to change frequently, the camera has better image impression, the total length of optics is short, the size of the whole system is small, the high resolution is realized, and the detection capability is improved.
Description
Technical Field
The invention relates to a wide-spectrum 20-time continuous zoom lens.
Background
With the rapid development of market demands of unmanned aerial vehicles, the requirements of matched detection systems are higher and higher. The existing airborne photoelectric detection system is required to be small in size, light in weight, strong in detection capability and high in definition, can continuously observe under severe weather conditions such as fog, rain, snow and the like, and can perform large-area small-magnification panoramic search and small-area large-magnification amplification observation on a target.
Disclosure of Invention
The present invention is an improvement of the above-mentioned problem, that is, the technical problem to be solved by the present invention is to provide a wide-spectrum 20-times zoom lens. The existing airborne zoom lens is limited by weight and volume, so that the zoom ratio is small, the resolution ratio is low, and the detection capability of an airborne system is seriously influenced.
The specific embodiment of the invention is as follows: a20 times wide spectrum continuous zoom lens, the light in the optical structure of the lens has positive front fixed group A from left to right direction; a zoom group B with negative focal power; a compensation group C with positive focal power; a diaphragm; a rear fixed group E with positive focal power; a color filter assembly;
the front fixing group A is sequentially provided with a biconvex lens A-1, a positive meniscus lens A-2 and a first gluing group formed by tightly connecting a negative meniscus lens A-3 and a positive meniscus lens A-4; the zoom group B is sequentially provided with a second adhesive group consisting of a negative meniscus lens B-1, a biconcave lens B-2 and a biconvex lens B-3 which are closely connected, and a biconcave lens B-4;
the compensation group C is provided with a biconvex lens C-1, a third bonding group formed by tightly connecting a negative meniscus lens C-2 and a biconvex lens C-3, and a positive meniscus lens C-4; the rear fixed group E is provided with a biconcave lens E-1, a positive meniscus lens E-2, a fourth cementing group formed by tightly connecting a biconcave lens E-3 and a biconvex lens E-4, a negative meniscus lens E-5 and a biconvex lens E-6.
Further, the L/f' is less than or equal to 0.7; wherein f' is the focal length of the telephoto lens; and L is the length from the first surface of the lens to an imaging surface on an optical axis.
Further, L1/f' is more than or equal to 0.935; wherein L1 is the length of the last lens of the lens to the imaging surface on the optical axis; f' is the focal length of the telephoto lens;
further, fB '/fC' is not less than 0.6 and not more than 0.55; wherein fB' is the focal length of the lens zooming group component B; and fC' is the focal length of the lens compensation group component C.
Further, in the color filter assembly F, visible light and near infrared band color filters are respectively disposed.
Further, the air distance between the biconvex lens A-1 and the orthodontic lens A-2 is 0.1mm, the air distance between the orthodontic lens A-2 and the first gluing group is 1mm, and the air distance between the front fixed group A and the zoom group B is 1.1-31.8 mm;
the air distance between the negative meniscus lens B-1 and the biconcave lens B-2 is 1.5 mm;
the air distance between the second gluing set and the double-concave lens B-4 is 0.7 mm;
the air distance between the zooming group B and the compensation group C is 48.4 mm-2.3 mm;
the air distance between the biconvex lens C-1 and the negative meniscus lens C-2 is 0.1 mm;
the air distance between the third gluing group and the rear fixing group E is 2.5 mm-17.9 mm;
the air distance between the biconcave lens E-1 and the positive meniscus lens E-2 is 0.1 mm;
the air distance between the positive meniscus lens E-2 and the fourth glue combination is 1.72 m;
the air distance between the fourth gluing set and the negative meniscus lens E-5 is 1.5 mm;
the air distance between the negative meniscus lens E-5 and the biconvex lens E-6 is 4.15 mm;
the air distance between the lenticular lens E-6 and the color filter was 16.85mm.
Compared with the prior art, the invention has the following beneficial effects: (1) the invention has a working spectrum of 400 nm-1000 nm, and can meet the use requirements in daytime and haze environment. (2) The lens zooms from a short focus to a long focus end with 20 times of magnification, and the aperture value change is small, so that the brightness change of a monitoring picture is uniform, the exposure time of a camera does not need to be changed frequently, and the lens has better image impression. (3) The lens adopts the design of the steepest zooming cam curve, so that the moving strokes of the zooming group and the compensation group of the system are as small as possible, and by adopting the measures, the lead of the zooming process is small, the total optical length is short, the size of the whole system is small, and the lens has high resolution and improves the detection capability.
Drawings
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention.
FIG. 2 is a graph of MTF of short-focus visible light according to an embodiment of the present invention.
FIG. 3 is a long-focus visible light MTF graph according to an embodiment of the present invention.
FIG. 4 is a short-focus near-infrared MTF graph according to an embodiment of the present invention.
FIG. 5 is a long-focus near-infrared MTF graph according to an embodiment of the present invention.
In the figure: 1-a biconvex lens A-1, 2-a positive meniscus lens A-2, 3-a negative meniscus lens A-3, 4-a positive meniscus lens A-4, 5-a negative meniscus lens B-1, 6-a biconcave lens B-2, 7-a biconvex lens B-3, 8-a biconcave lens B-4, 9-a biconvex lens C-1, 10-a negative meniscus lens C-2, 11-a biconvex lens C-3, 12-a positive meniscus lens C-4, 13-a diaphragm, 14-a biconcave lens E-1, 15-a positive meniscus lens E-2, 16-a biconcave lens E-3, 17-a biconvex lens E-4, 18-a negative meniscus lens E-5, 19-a biconvex lens E-6, 20-color filter.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 5, in the optical structure of fig. 1, front fixed groups a with positive focal power are respectively arranged on light rays from left to right; a zoom group B with negative focal power; a compensation group C with positive focal power; a diaphragm; a rear fixed group E with positive focal power; a color filter assembly.
The front fixing group A is sequentially provided with a biconvex lens A-1, a positive meniscus lens A-2 and a first gluing group formed by tightly connecting a negative meniscus lens A-3 and a positive meniscus lens A-4; the zoom group B is sequentially provided with a second adhesive group consisting of a negative meniscus lens B-1, a biconcave lens B-2 and a biconvex lens B-3 which are closely connected, and a biconcave lens B-4; the compensation group C is provided with a biconvex lens C-1, a third bonding group formed by tightly connecting a negative meniscus lens C-2 and a biconvex lens C-3, and a positive meniscus lens C-4; the rear fixed group E is provided with a biconcave lens E-1, a positive meniscus lens E-2, a fourth cementing group formed by tightly connecting a biconcave lens E-3 and a biconvex lens E-4, a negative meniscus lens E-5 and a biconvex lens E-6. In the color filter assembly F, visible and near-infrared band color filters are respectively disposed.
The wide-spectrum 20-time continuous zoom lens meets the following conditions:
l/f' is less than or equal to 0.7; wherein f' is the focal length of the telephoto lens; l is the length from the first surface of the lens to an imaging surface on an optical axis;
1≤FNO2/ FNO1less than or equal to 1.15; wherein FNO1F-number of the short focus of the lens; FNO2The f-number of the long focus of the lens.
L1/f' is more than or equal to 0.935; wherein L1 is the length of the last lens of the lens to the imaging surface on the optical axis; f' is the focal length of the telephoto lens;
fB '/fC' is not less than 0.6 and not more than-0.55; wherein fB' is the focal length of the lens zooming group component B; and fC' is the focal length of the lens compensation group component C.
The parameters of each lens of the wide-spectrum 20-time zoom lens meet the requirements of table 1, wherein the surfaces S1, S2, S3 and S4 … represent the surfaces of each lens divided by light from left to right in fig. 1, the bonding surface is regarded as the right lens of the bonding lens to which one surface belongs, and the distance between the thickness surface and the center of the adjacent surface is regarded as the center distance.
The wide-spectrum 20-time continuous zoom lens consists of a front fixed group A, a zoom group B, a compensation group C, a rear fixed group E and a color filter switching device. Optical index that camera lens reached:
1. focal length: f' =9 mm-180 mm;
2. relative pore diameter: the short focus D/f 'is better than 1/4, and the long focus D/f' is better than 1/4.5;
3. optical transfer function: when the spatial frequency of the transfer function is 145lp/mm, the MTF is more than or equal to 20 percent;
4. the optical total length is less than 125 mm;
5. the weight is less than 1 Kg.
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 numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values 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 terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
Meanwhile, if the invention as described above discloses or relates to parts or structural members 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), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes 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 solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; 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. A wide-spectrum 20-time continuous zoom lens is characterized in that a front fixed group A with positive focal power is respectively arranged in the optical structure of the lens from left to right; a zoom group B with negative focal power; a compensation group C with positive focal power; a diaphragm; a rear fixed group E with positive focal power; a color filter assembly;
the front fixing group A is sequentially provided with a biconvex lens A-1, a positive meniscus lens A-2 and a first gluing group formed by tightly connecting a negative meniscus lens A-3 and a positive meniscus lens A-4; the zoom group B is sequentially provided with a second adhesive group consisting of a negative meniscus lens B-1, a biconcave lens B-2 and a biconvex lens B-3 which are closely connected, and a biconcave lens B-4;
the compensation group C is provided with a biconvex lens C-1, a third bonding group formed by tightly connecting a negative meniscus lens C-2 and a biconvex lens C-3, and a positive meniscus lens C-4; the rear fixed group E is provided with a biconcave lens E-1, a positive meniscus lens E-2, a fourth cementing group formed by tightly connecting a biconcave lens E-3 and a biconvex lens E-4, a negative meniscus lens E-5 and a biconvex lens E-6.
2. The wide-spectrum 20-fold zoom lens as claimed in claim 1, wherein L/f' is less than or equal to 0.7; wherein f' is the focal length of the telephoto lens; and L is the length from the first surface of the lens to an imaging surface on an optical axis.
3. The wide-spectrum 20-fold zoom lens as claimed in claim 1, wherein 0.935L 1/f'; wherein L1 is the length of the last lens of the lens to the imaging surface on the optical axis; f' is the focal length of the telephoto lens.
4. The wide-spectrum 20-fold zoom lens as claimed in claim 1, wherein-0.6 ≦ fB '/fC' ≦ -0.55; wherein fB' is the focal length of the lens zooming group component B; and fC' is the focal length of the lens compensation group component C.
5. The wide-spectrum 20-magnification zoom lens according to claim 1, wherein the color filter assembly F is provided with color filters in visible and near-infrared wavelength bands, respectively.
6. The wide-spectrum 20-fold zoom lens according to claim 1,
the air distance between the biconvex lens A-1 and the orthodontic lens A-2 is 0.1mm, the air distance between the orthodontic lens A-2 and the first cementing group is 1mm, and the air distance between the front fixed group A and the zoom group B is 1.1-31.8 mm;
the air distance between the negative meniscus lens B-1 and the biconcave lens B-2 is 1.5 mm;
the air distance between the second gluing set and the double-concave lens B-4 is 0.7 mm;
the air distance between the zooming group B and the compensation group C is 48.4 mm-2.3 mm;
the air distance between the biconvex lens C-1 and the negative meniscus lens C-2 is 0.1 mm;
the air distance between the third gluing group and the rear fixing group E is 2.5 mm-17.9 mm;
the air distance between the biconcave lens E-1 and the positive meniscus lens E-2 is 0.1 mm;
the air distance between the positive meniscus lens E-2 and the fourth glue combination is 1.72 m;
the air distance between the fourth gluing set and the negative meniscus lens E-5 is 1.5 mm;
the air distance between the negative meniscus lens E-5 and the biconvex lens E-6 is 4.15 mm;
the air distance between the lenticular lens E-6 and the color filter was 16.85mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111258176.3A CN114047615B (en) | 2021-10-27 | 2021-10-27 | Wide-spectrum 20-time continuous zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111258176.3A CN114047615B (en) | 2021-10-27 | 2021-10-27 | Wide-spectrum 20-time continuous zoom lens |
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| CN114047615A true CN114047615A (en) | 2022-02-15 |
| CN114047615B CN114047615B (en) | 2023-05-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114624869A (en) * | 2022-03-10 | 2022-06-14 | 长春通视光电技术有限公司 | High-resolution and large-zoom-ratio optical system and zoom lens adopting same |
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| CN203643676U (en) * | 2013-12-25 | 2014-06-11 | 福建福光数码科技有限公司 | High-resolution large-zoom-ratio machine-mounted zoom camera lens |
| US20170248777A1 (en) * | 2016-02-29 | 2017-08-31 | Ricoh Imaging Company, Ltd. | Zoom lens system |
| CN208477195U (en) * | 2018-07-13 | 2019-02-05 | 嘉兴中润光学科技有限公司 | Minimize the high definition varifocal optical system of big target surface |
| CN208752300U (en) * | 2018-09-06 | 2019-04-16 | 福建福光股份有限公司 | A kind of high definition continuous magnification lens with active temperature focusing function |
-
2021
- 2021-10-27 CN CN202111258176.3A patent/CN114047615B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203643676U (en) * | 2013-12-25 | 2014-06-11 | 福建福光数码科技有限公司 | High-resolution large-zoom-ratio machine-mounted zoom camera lens |
| US20170248777A1 (en) * | 2016-02-29 | 2017-08-31 | Ricoh Imaging Company, Ltd. | Zoom lens system |
| CN208477195U (en) * | 2018-07-13 | 2019-02-05 | 嘉兴中润光学科技有限公司 | Minimize the high definition varifocal optical system of big target surface |
| CN208752300U (en) * | 2018-09-06 | 2019-04-16 | 福建福光股份有限公司 | A kind of high definition continuous magnification lens with active temperature focusing function |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114624869A (en) * | 2022-03-10 | 2022-06-14 | 长春通视光电技术有限公司 | High-resolution and large-zoom-ratio optical system and zoom lens adopting same |
| CN114624869B (en) * | 2022-03-10 | 2024-03-29 | 长春通视光电技术股份有限公司 | High-resolution and large-zoom-ratio optical system and zoom lens adopting same |
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| CN114047615B (en) | 2023-05-09 |
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