CN107608062B - Multispectral camera optical system - Google Patents
Multispectral camera optical system Download PDFInfo
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- CN107608062B CN107608062B CN201710889935.3A CN201710889935A CN107608062B CN 107608062 B CN107608062 B CN 107608062B CN 201710889935 A CN201710889935 A CN 201710889935A CN 107608062 B CN107608062 B CN 107608062B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 36
- 239000005357 flat glass Substances 0.000 claims abstract description 11
- 238000003384 imaging method Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 229910052594 sapphire Inorganic materials 0.000 claims description 3
- 239000010980 sapphire Substances 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 230000005499 meniscus Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 3
- 238000011835 investigation Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a multispectral camera optical system, which comprises window glass, a fixed lens group, a diaphragm, a focusing lens group, an optical filter and an image surface, wherein the window glass, the fixed lens group, the diaphragm, the focusing lens group, the optical filter and the image surface are sequentially arranged from an object side surface, the fixed lens group comprises a first concave-convex lens, a first biconvex lens and a first biconcave lens, the diaphragm is arranged in the fixed lens group, the focusing lens group comprises a second concave-convex lens, a third concave-convex lens and a fourth concave-convex lens, and the focusing lens group can integrally move along the optical axis direction. The focusing lens group can integrally move along the optical axis direction, the distance between the focusing lens group and the fixed lens group can be adjusted according to different object distances, so that zooming is realized.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a multispectral camera optical system.
Background
The multispectral camera is widely applied to the fields of aerospace investigation, national resource investigation and monitoring, disaster prevention and reduction, agriculture, forestry, water conservancy, ecological environment, urban planning, construction and the like at present.
In general, the optical system of the multispectral camera adopts a reflective or refractive structure, the reflective structure does not introduce any chromatic aberration, the optical transmittance is high, but the reflective structure has serious central obscuration, the relative aperture loss of the system is serious, the system is unsuitable for a non-refrigeration detector with particularly high relative aperture requirement, and the field angle of the reflective structure is usually smaller. The refraction type structure can not have the problems, but the existing refraction type multispectral camera is generally a fixed focus system, and the zooming can not be realized.
Disclosure of Invention
Based on this, it is necessary to provide a multispectral camera optical system that can realize zooming.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a multispectral camera optical system, includes window glass, fixed lens group, diaphragm, focusing lens group, light filter and the image plane that set gradually from the object side, fixed lens group includes first meniscus lens, first biconvex lens and first biconcave lens, the diaphragm set up in the fixed lens group, focusing lens group includes second meniscus lens, third meniscus lens and fourth meniscus lens, but focusing lens group wholly moves along the optical axis direction.
Further, the convex surface of the first concave-convex lens faces the object side surface.
Further, the diaphragm is disposed between the first biconvex lens and the first biconcave lens.
Further, the distance between the diaphragm and the convex surface vertex of the first biconvex lens is 0.2mm.
Further, the convex surfaces of the second meniscus lens, the third meniscus lens and the fourth meniscus lens face the image side surface.
Further, the window glass is made of sapphire, and the thickness of the window glass is 3mm.
Further, the moving distance of the focusing lens group is 1.397mm, the focal length adjusting range is 43.4845 mm-44.4344 mm, and the focal length adjusting range corresponds to an object distance from 2m to infinity.
The design spectrum range of the optical system of the multispectral camera is 470 nm-1025 nm, the angle of the diagonal line of view is 24 degrees, and the working F number is 5.
The resolution of the detector adopted by the image plane is 2048X2048, the size of a single pixel is 6.5 mu m multiplied by 6.5 mu m, namely the imaging size of the detector is 13.312mm multiplied by 13.312mm, and the diagonal line length is 18.826mm.
The beneficial effects of the invention are as follows: the focusing lens group can integrally move along the optical axis direction, the distance between the focusing lens group and the fixed lens group can be adjusted according to different object distances, so that zooming is realized.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a schematic diagram of an optical system of a multispectral camera according to the present invention;
FIG. 2 is a schematic diagram of the optical path of the optical system of the multispectral camera of the present invention;
FIG. 3 is a graph of Modulation Transfer Function (MTF) of an image plane of a multispectral camera optical system of the present invention;
Fig. 4 is a diagram of field curvature distortion of an optical system of a multispectral camera of the present invention.
The names and the numbers of the parts in the figure are respectively as follows:
01. A window glass; 02. a diaphragm; 03. a light filter; 04. an image plane; g1, fixing a lens group; l1, a first concave-convex lens; l2, a first lenticular lens; l3, a first biconcave lens; g2, focusing lens group; l4, a second concave-convex lens; l5, a third concave-convex lens; and L6, a fourth concave-convex lens.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the invention only by way of illustration, and therefore it shows only the constitution related to the invention.
As shown in fig. 1, the present invention provides a multispectral camera optical system, which includes a window glass 01, a fixed lens group G1, a diaphragm 02, a focusing lens group G2, an optical filter 03 and an image plane 04, which are sequentially arranged from an object side.
The window glass 01 is made of sapphire and has a thickness of 3mm and is used for protecting an internal lens structure.
The fixed lens group G1 includes a first meniscus lens L1, a first biconvex lens L2, and a first biconcave lens L3, where the convex surface of the first meniscus lens L1 faces the object side. The diaphragm 02 is disposed between the first biconvex lens L2 and the first biconcave lens L3, and the distance between the diaphragm 02 and the apex of the convex surface R4 of the first biconvex lens L2 is about 0.2mm.
The focusing lens group G2 includes a second meniscus lens L4, a third meniscus lens L5, and a fourth meniscus lens L6, and convex surfaces of the second meniscus lens L4, the third meniscus lens L5, and the fourth meniscus lens L6 face the image side.
The focusing lens group G2 can move along the optical axis direction as a whole, and the moving distance of the focusing lens group G2 is 1.397mm. The distance between the focusing lens group G2 and the fixed lens group G1 can be adjusted according to different object distances, the moving distance between the focusing lens group G2 and the fixed lens group G1 is 1.397mm, the focal length adjusting range is 43.4845 mm-44.4344 mm, the focusing distance between the focusing lens group G2 and the object distance corresponds to 2m to infinity, as shown in table 1, the focusing distance between the focusing lens group G2 and the corresponding system focal length relationship is shown in the first row data, when the object distance is 2m, the distance between the focusing lens group G2 and the fixed lens group G1 is 1mm, the corresponding focal length of the multispectral camera is 43.4845mm, when the object distance is 3m, the distance between the focusing lens group G2 and the fixed lens group G1 is 1.453mm, and the corresponding focal length of the multispectral camera is 43.7883mm.
In the moving process of the focusing lens group G2, the jumping of the image surface 04 is smaller than 6um (about one pixel size), so that the image formed by the optical system can be considered to be unchanged along with the focusing object distance, and the imaging quality is stable.
Table 1 focusing distance of focusing lens group and corresponding system focal length
| Object distance (m) | Distance (mm) of focusing group from fixed group | Corresponding focal length (mm) |
| 2 | 1 | 43.4845 |
| 3 | 1.453 | 43.7883 |
| 4 | 1.684 | 43.9447 |
| 5 | 1.825 | 44.0401 |
| 6 | 1.919 | 44.1044 |
| 7 | 1.986 | 44.1507 |
| 8 | 2.037 | 44.1855 |
| 9 | 2.077 | 44.2128 |
| 10 | 2.108 | 44.2347 |
| 20 | 2.252 | 44.3339 |
| 40 | 2.325 | 44.384 |
| 60 | 2.349 | 44.4008 |
| 80 | 2.361 | 44.4092 |
| 100 | 2.368 | 44.4142 |
| 200 | 2.383 | 44.4243 |
| 400 | 2.39 | 44.4294 |
| 800 | 2.394 | 44.4319 |
| ∞ | 2.397 | 44.4344 |
In the present embodiment, the thickness of the filter 03 is 3mm.
The resolution of the detector used for the image plane 04 is 2048X2048, the size of a single pixel is 6.5 μm X6.5 μm, that is, the imaging size of the detector is 13.312mm X13.312 mm, and the diagonal length is 18.826mm.
The design spectrum range of the multispectral lens is 470 nm-1025 nm, the diagonal view angle is 24 degrees, and the working F number is 5.
As shown in fig. 2, the light beam propagation path of the optical system of the multispectral camera is that the light beam enters the window glass 01 at a full field angle of 24 degrees, passes through the fixed lens group G1 and the focusing lens group G2, and then enters the image plane 04 after passing through the optical filter 03.
As shown in table 2, specific parameter values of each lens when the object distance of the optical system of the multispectral camera is 2m are shown, wherein the column of the surface indicates the corresponding number of the surface of each lens; the column "radius" gives the spherical radius corresponding to each surface; the column "thickness/pitch" gives the axial distance between adjacent surfaces, if the two surfaces belong to the same lens, the thickness value indicates the lens thickness, otherwise the object/image plane to lens distance or the distance between adjacent lenses; the column "half pore size" gives the 1/2 pore size value of the corresponding surface.
Table 2 the design data of each lens of the optical system of the multispectral camera of the present invention
As shown in FIG. 3, the Modulation Transfer Function (MTF) diagram of the image surface of the optical system of the multispectral camera has MTF >0.48 at the spatial frequency of 77Lp/mm, and the transfer function curve is close to the diffraction limit shown in the diagram, so that the multispectral camera has good image quality.
As shown in FIG. 4, the field curvature and distortion diagram of the optical system of the multispectral camera of the invention show that the image plane curvature of the multispectral camera of the invention is within 0.1mm, the distortion is less than 0.02%, and the imaging quality requirement is satisfied.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (3)
1. A multispectral camera optical system, characterized in that: the multi-spectral camera lens comprises window glass, a fixed lens group, a focusing lens group, an optical filter and an image surface which are sequentially arranged from an object side, wherein the fixed lens group comprises a first concave-convex lens, a first biconvex lens, a first biconcave lens and a diaphragm, the diaphragm is arranged in the fixed lens group, the convex surface of the first concave-convex lens faces the object side, the diaphragm is arranged between the first biconvex lens and the first biconcave lens, the distance between the diaphragm and the top of the convex surface of the first biconvex lens is 0.2mm, the focusing lens group comprises a second concave-convex lens, a third concave-convex lens and a fourth concave-convex lens, the convex surfaces of the second concave-convex lens, the third concave-convex lens and the fourth concave-convex lens face towards the image side, the focusing lens group can move integrally along the optical axis direction, the moving distance of the focusing lens group relative to the fixed lens group is 1.397mm, the design spectrum range of the multi-spectral camera lens optical system is 470 nm-1025 nm, the diagonal view angle is 24 degrees, the distance between the diaphragm and the object side is 43.4845 mm-44.4344 mm, and the focal length between the lens is 5.
2. The multispectral camera optical system of claim 1, wherein: the window glass is made of sapphire and has a thickness of 3mm.
3. The multispectral camera optical system of claim 1, wherein: the resolution of the detector adopted by the image plane is 2048X2048, the size of a single pixel is 6.5 mu m multiplied by 6.5 mu m, namely the imaging size of the detector is 13.312mm multiplied by 13.312mm, and the diagonal line length is 18.826mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710889935.3A CN107608062B (en) | 2017-09-27 | 2017-09-27 | Multispectral camera optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710889935.3A CN107608062B (en) | 2017-09-27 | 2017-09-27 | Multispectral camera optical system |
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| CN107608062A CN107608062A (en) | 2018-01-19 |
| CN107608062B true CN107608062B (en) | 2024-07-26 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07209571A (en) * | 1994-01-17 | 1995-08-11 | Nikon Corp | Optical system with flare stopper |
| CN207198449U (en) * | 2017-09-27 | 2018-04-06 | 常州硕美光电科技有限公司 | Multispectral camera optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6319765B2 (en) * | 2014-07-02 | 2018-05-09 | 株式会社オプトロジック | Imaging lens |
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- 2017-09-27 CN CN201710889935.3A patent/CN107608062B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07209571A (en) * | 1994-01-17 | 1995-08-11 | Nikon Corp | Optical system with flare stopper |
| CN207198449U (en) * | 2017-09-27 | 2018-04-06 | 常州硕美光电科技有限公司 | Multispectral camera optical system |
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