CN115268043A - Single-component strong-light-shooting double-view-field switching optical system and imaging method thereof - Google Patents
Single-component strong-light-shooting double-view-field switching optical system and imaging method thereof Download PDFInfo
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- CN115268043A CN115268043A CN202210839485.8A CN202210839485A CN115268043A CN 115268043 A CN115268043 A CN 115268043A CN 202210839485 A CN202210839485 A CN 202210839485A CN 115268043 A CN115268043 A CN 115268043A
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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
- G02B15/145—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 five groups only
- G02B15/1455—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 five groups only the first group being negative
- G02B15/145513—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 five groups only the first group being negative 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
- G02B15/177—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 having a negative front lens or group of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
Abstract
The invention relates to a single-element strong-light-shooting double-view-field switching optical system which comprises a fixed group A, a switching group B, a fixed group C and an imaging target surface, wherein the fixed group A, the switching group B, the fixed group C and the imaging target surface are sequentially arranged from left to right along the light incidence direction, and the fixed group A comprises a double-convex positive lens A-1, a double-convex positive lens A-2 and a double-concave negative lens A-3; the switching group B comprises a crescent negative lens B-1, a crescent positive lens B-2 and a biconcave negative lens B-3; the fixed group C comprises a biconvex positive lens C-1, a crescent negative lens C-2, a crescent positive lens C-3, a biconvex positive lens C-4, a biconcave negative lens C-5, a biconcave negative lens C-6, a crescent positive lens C-7, a biconcave negative lens C-8 and a biconvex negative lens C-9. The optical system has a simple structure and a reasonable design, can realize the quick switching of a large view field and a small view field through the axial position change of the switching group B, namely simultaneously realize the quick searching of the large view field and the high-resolution identification of the small view field, and has a large relative aperture and strong light-shooting capability.
Description
Technical Field
The invention relates to a single-element strong-photographing double-view-field switching optical system and an imaging method thereof.
Background
With the continuous development of the optical industry, optical imaging tracking is widely applied in the fields of military industry, security protection, aerospace and the like, and is developing towards the requirements of light weight, miniaturization, high resolution and the like. For a fast moving target, the double-view-field imaging tracking system gives consideration to short-focus large-view-field searching and simultaneously has the functions of long-focus high-resolution identification and measurement, so that the double-view-field imaging tracking system has a wide application prospect.
The existing double-view-field imaging tracking optical system mainly has independent zooming modes, cut-in zooming modes, axial zooming modes and the like. The independent zooming mode adopts two detectors to respectively and independently design a large-view-field optical system and a small-view-field optical system, so that the cost is high and the miniaturization is not facilitated; the cut-in zooming mode realizes double-view-field imaging by radially cutting in the zooming component, the radial size of the system is large, and the consistency of the optical axes of the two view fields is poor; the axial zooming mode realizes double-view-field imaging by utilizing the principle of object-image exchange and through the relative axial motion between the zooming component and the compensation component, and has the advantages of compact structure, high integration level and the like.
Disclosure of Invention
The invention improves the problems, namely the technical problem to be solved by the invention is to provide a single-component strong light-taking double-view-field switching optical system and an imaging method thereof, the double-view-field quick switching is realized only by axial movement of a single component on the basis of an axial zooming mode, the optical system has compact volume, and simultaneously has larger relative aperture and strong light-taking characteristics.
The invention is formed in this way, it includes fixing group A, switching group B, fixing group C and imaging target surface that set up sequentially from left to right along the incident direction of light, said fixing group A includes the positive lens A-1 of the double convex shape, positive lens A-2 of the double convex shape and negative lens A-3 of the double concave shape; the switching group B comprises a crescent negative lens B-1, a crescent positive lens B-2 and a biconcave negative lens B-3; the fixed group C comprises a biconvex positive lens C-1, a crescent negative lens C-2, a crescent positive lens C-3, a biconvex positive lens C-4, a biconcave negative lens C-5, a biconcave negative lens C-6, a crescent positive lens C-7, a biconcave negative lens C-8 and a biconvex negative lens C-9.
Further, the positive lens A-2 and the negative lens A-3 are tightly connected to form a first bonding group U1, the negative lens B-1 and the positive lens B-2 are tightly connected to form a second bonding group U2, the negative lens C-2 and the positive lens C-3 are tightly connected to form a third bonding group U3, the positive lens C-4 and the negative lens C-5 are tightly connected to form a fourth bonding group U4, and the negative lens C-6 and the positive lens C-7 are tightly connected to form a fifth bonding group U5.
Furthermore, the resolution of the imaging target surface is 800 multiplied by 800, the pixel size is 4.5 mu m, and the response is in a wave band of 0.6 to 0.9 mu m.
Further, the first bonding group has negative focal power phiU1The second adhesive combination has negative focal power phiU2The third cemented group has a positive refractive power phiU3The fourth cemented group has positive focal power phiU4The fifth cemented group has a negative focal power phiU5And satisfies the following relationship:
0.01＜｜φU1/φS｜＜0.05，0.05＜｜φU1/φL｜＜0.1；
0.1＜｜φU2/φS｜＜0.4，0.6＜｜φU2/φL｜＜1；
0.2＜｜φU3/φS｜＜0.5，0.8＜｜φU3/φL｜＜1.1；
0.1＜｜φU4/φS｜＜0.3，0.3＜｜φU4/φL｜＜0.6；
0.08＜｜φU5/φS｜＜0.25，0.45＜｜φU5/φL｜＜0.65；
wherein phi isSFocal power of the whole optical path of large visual field, phiLThe focal power of the whole optical path of the small visual field.
Furthermore, the optical system has strong light-absorbing capacity relative to the aperture of 1/1.8.
Further, in the imaging method of the single-component intensive-photographing double-view-field switching optical system, light rays sequentially pass through a positive lens A-1, a positive lens A-2, a negative lens A-3, a negative lens B-1, a positive lens B-2, a negative lens B-3, a positive lens C-1, a negative lens C-2, a positive lens C-3, a positive lens C-4, a negative lens C-5, a negative lens C-6, a positive lens C-7, a negative lens C-8 and a negative lens C-9 from left to right to be imaged.
Compared with the prior art, the invention has the following beneficial effects: the device is simple in structure and reasonable in design, zooming is achieved in a single-component axial moving mode, moving distance is short, fast switching of double fields of view is facilitated, the adjusting difficulty is small, consistency of optical axes of large and small fields of view is easy to guarantee, the structure is compact, light shooting capacity is strong, and fast searching of large fields of view and high-resolution recognition of small fields of view can be achieved simultaneously.
Drawings
FIG. 1 is a diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a plot of a large field of view for an embodiment of the present invention;
FIG. 3 is a graph of MTF in a large field of view according to an embodiment of the present invention;
FIG. 4 is a diagram of an embodiment of the present invention in a small field of view;
FIG. 5 is a graph of MTF at a small field of view for an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Example 1: referring to fig. 1 to 5, in the present embodiment, a single-component intensive-photographing dual-field-of-view switching optical system is provided, which includes a fixed group a, a switching group B, a fixed group C, and an imaging target surface, which are sequentially arranged along a light incidence direction from left to right, where the fixed group a includes a double-convex positive lens a-1, a double-convex positive lens a-2, and a double-concave negative lens a-3; the switching group B comprises a crescent negative lens B-1, a crescent positive lens B-2 and a biconcave negative lens B-3; the fixed group C comprises a biconvex positive lens C-1, a crescent negative lens C-2, a crescent positive lens C-3, a biconvex positive lens C-4, a biconcave negative lens C-5, a biconcave negative lens C-6, a crescent positive lens C-7, a biconcave negative lens C-8 and a biconvex negative lens C-9.
In this embodiment, the biconvex positive lens a-2 and the biconcave negative lens a-3 are closely attached to form a first adhesive group U1, the crescent negative lens B-1 and the crescent positive lens B-2 are closely attached to form a second adhesive group U2, the crescent negative lens C-2 and the crescent positive lens C-3 are closely attached to form a third adhesive group U3, the biconvex positive lens C-4 and the biconcave negative lens C-5 are closely attached to form a fourth adhesive group U4, and the biconcave negative lens C-6 and the crescent positive lens C-7 are closely attached to form a fifth adhesive group U5.
In the embodiment, the imaging target surface has a resolution of 800 × 800, a pixel size of 4.5 μm, and a response in a wave band of 0.6 to 0.9 μm.
In the embodiment, the switching group B is a movable component, and when the central interval between the switching group B and the fixed group A is 7.0mm, the optical system has a large field of view; the optical system has a small field of view when the center of the switching group B is spaced 68.4mm from the center of the fixed group a. The double-view-field quick switching can be realized by axially moving the position of the switching group B.
In this embodiment, the first glue set has a negative focal power φU1The second adhesive combination has negative focal power phiU2The third cemented group has a positive refractive power phiU3The fourth cemented group has positive focal power phiU4The fifth cemented group has a negative focal power phiU5And satisfies the following relationship:
0.01＜｜φU1/φS｜＜0.05，0.05＜｜φU1/φL｜＜0.1；
0.1＜｜φU2/φS｜＜0.4，0.6＜｜φU2/φL｜＜1；
0.2＜｜φU3/φS｜＜0.5，0.8＜｜φU3/φL｜＜1.1；
0.1＜｜φU4/φS｜＜0.3，0.3＜｜φU4/φL｜＜0.6；
0.08＜｜φU5/φS｜＜0.25，0.45＜｜φU5/φL｜＜0.65；
wherein phi isSFocal power of the whole optical path of large field of view, phiLThe focal power of the whole optical path of the small visual field.
In the present embodiment, the optical system has a strong light-absorbing capability with respect to the aperture of 1/1.8.
In the present embodiment, at the time of imaging: light rays sequentially pass through the positive lens A-1, the positive lens A-2, the negative lens A-3, the negative lens B-1, the positive lens B-2, the negative lens B-3, the positive lens C-1, the negative lens C-2, the positive lens C-3, the positive lens C-4, the negative lens C-5, the negative lens C-6, the positive lens C-7, the negative lens C-8 and the negative lens C-9 from left to right to carry out imaging.
Example 2: in the embodiment, each lens of the single-component strong light-taking double-view-field switching optical system meets the parameter requirements shown in table 1, wherein R is the curvature radius of the lens surface and the unit is mm; d is the thickness of the lenses and the air space between the lenses, and the unit is mm; n is the refractive index of the material; v is the Abbe number of the material; the face numbers are in turn arranged for each lens in the order from left to right as shown in fig. 1:
TABLE 1
The axial moving distance of a switching group B in the single-component strong-light-shooting double-view-field switching optical system is 61.4mm, and the switching group is driven by a motor to move to a corresponding position so as to realize the quick switching of double view fields. Fig. 2 and 3 show the dot alignment chart and the MTF curve of the optical system in the large field of view state, and fig. 4 and 5 show the dot alignment chart and the MTF curve of the optical system in the small field of view state. As can be known from the MTF curves, the MTF curves of the large field and the small field of view of the optical system are not less than 0.5 at the frequency of 111lp/mm, and the system has the capability of realizing large field of view fast search and small field of view high-resolution identification imaging at the same time.
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.
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 a bolt or screw connection) can also be 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).
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.
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 solution of the present invention and not to limit it; although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should 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 single-component strong-light-shooting double-view-field switching optical system is characterized by comprising a fixed group A, a switching group B, a fixed group C and an imaging target surface which are sequentially arranged from left to right along the incident direction of light rays, wherein the fixed group A comprises a double-convex positive lens A-1, a double-convex positive lens A-2 and a double-concave negative lens A-3; the switching group B comprises a crescent negative lens B-1, a crescent positive lens B-2 and a biconcave negative lens B-3; the fixed group C comprises a biconvex positive lens C-1, a crescent negative lens C-2, a crescent positive lens C-3, a biconvex positive lens C-4, a biconcave negative lens C-5, a biconcave negative lens C-6, a crescent positive lens C-7, a biconcave negative lens C-8 and a biconvex negative lens C-9.
2. The single-component intensive-light double-field-of-view switching optical system according to claim 1, wherein the positive lens a-2 and the negative lens a-3 are closely connected to form a first cemented group U1, the negative lens B-1 and the positive lens B-2 are closely connected to form a second cemented group U2, the negative lens C-2 and the positive lens C-3 are closely connected to form a third cemented group U3, the positive lens C-4 and the negative lens C-5 are closely connected to form a fourth cemented group U4, and the negative lens C-6 and the positive lens C-7 are closely connected to form a fifth cemented group U5.
3. The single-component intensive-light-taking dual-field-of-view switching optical system as claimed in claim 1, wherein the imaging target surface resolution is 800 x 800, the pixel size is 4.5 μm, and the response is in a wave band of 0.6 to 0.9 μm.
4. The method of claim 2The single-element strong-light-shooting double-view-field switching optical system is characterized in that the first bonding group has negative focal power phiU1The second cementing group has negative focal power phiU2The third cemented group has a positive refractive power phiU3The fourth cemented group has positive focal power phiU4The fifth cemented group has negative focal power phiU5And satisfies the following relationship:
0.01＜｜φU1/φS｜＜0.05，0.05＜｜φU1/φL｜＜0.1；
0.1＜｜φU2/φS｜＜0.4，0.6＜｜φU2/φL｜＜1；
0.2＜｜φU3/φS｜＜0.5，0.8＜｜φU3/φL｜＜1.1；
0.1＜｜φU4/φS｜＜0.3，0.3＜｜φU4/φL｜＜0.6；
0.08＜｜φU5/φS｜＜0.25，0.45＜｜φU5/φL｜＜0.65；
wherein phi isSFocal power of the whole optical path of large visual field, phiLThe focal power of the whole optical path of the small visual field.
5. The single-element strong-light double-field-of-view switching optical system according to claim 1, wherein the optical system has a strong light-absorbing capability with respect to an aperture of 1/1.8.
6. An imaging method of the single-component intensive-light double-field-of-view switching optical system as claimed in any one of claims 1 to 5, characterized in that light rays sequentially pass through a positive lens A-1, a positive lens A-2, a negative lens A-3, a negative lens B-1, a positive lens B-2, a negative lens B-3, a positive lens C-1, a negative lens C-2, a positive lens C-3, a positive lens C-4, a negative lens C-5, a negative lens C-6, a positive lens C-7, a negative lens C-8 and a negative lens C-9 from left to right to perform imaging.
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| JP2003029147A (en) * | 2001-07-12 | 2003-01-29 | Kyocera Corp | Zoom lens for projection |
| JP2005172938A (en) * | 2003-12-08 | 2005-06-30 | Fujinon Corp | Vibration isolating zoom lens |
| US20180143413A1 (en) * | 2014-12-26 | 2018-05-24 | Nikon Corporation | Variable power optical system, optical apparatus, and variable power optical system manufacturing method |
| CN209198755U (en) * | 2018-11-06 | 2019-08-02 | 中国科学院西安光学精密机械研究所 | A kind of short-wave infrared continuous magnification lens |
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