CN209842204U - Small-field-of-view ultraviolet objective optical system, ultraviolet objective and ultraviolet detector - Google Patents
Small-field-of-view ultraviolet objective optical system, ultraviolet objective and ultraviolet detector Download PDFInfo
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- CN209842204U CN209842204U CN201920007320.8U CN201920007320U CN209842204U CN 209842204 U CN209842204 U CN 209842204U CN 201920007320 U CN201920007320 U CN 201920007320U CN 209842204 U CN209842204 U CN 209842204U
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Abstract
The application discloses little field of view ultraviolet objective optical system, ultraviolet objective, ultraviolet detector, this optical system includes: the optical axis includes from the object side to the image side in order: the first lens group with positive focal power and the second lens group with positive focal power sequentially comprise the following components from the object side to the image side along the optical axis: the lens comprises a first positive lens, a first negative lens, a second positive lens, a diaphragm, a third positive lens and a second negative lens; the second lens group sequentially comprises from the object side to the image side along the optical axis: a fourth positive lens and a third negative lens. The optical system can realize small-field-angle large-aperture high-resolution conjugate imaging under an ultraviolet band. The application also discloses an ultraviolet objective lens and an ultraviolet detector comprising the optical system.
Description
Technical Field
The application relates to a small-field-of-view ultraviolet objective optical system, an ultraviolet objective, an ultraviolet detector and an ultraviolet objective, and belongs to the field of ultraviolet imaging.
Background
In the fields of criminal investigation, fire early warning, circuit searching, fluorescence detection, flow field diagnosis and the like, ultraviolet light with an ultraviolet band of 190-350 nm is often used for imaging.
The existing optical materials are rare and expensive in light-transmitting optical materials which can transmit ultraviolet light with the wavelength of 200 nm-400 nm; the ultraviolet optical system is difficult to balance various aberrations caused by the combined use of optical devices in the aspect of optical design; the above factors limit the development of uv objectives.
The refraction type ultraviolet objective lens can only realize smaller relative aperture under the condition of eliminating chromatic aberration, and the image plane illumination is difficult to meet the working requirement of the detector.
The image space working number F/D (F represents the diameter of the optical system, and D represents the diameter of the entrance pupil) of the ultraviolet objective lens represents the intensity of the energy collected by the objective lens, and the detection capability and accuracy of the ultraviolet detection system are directly influenced by the image space working number F/D of the ultraviolet objective lens. The existing refraction type ultraviolet long-focus optical system has high difficulty in processing a large-aperture optical system, and the relative aperture F value is generally below 4.0.
However, in order to realize the imaging of the large-aperture long-focus objective lens, the overall size of the optical system is too large, which causes difficulty in focusing.
SUMMERY OF THE UTILITY MODEL
According to one aspect of the application, a small-field-of-view ultraviolet objective optical system is provided, and the optical system can realize small-field-angle large-aperture high-resolution conjugate imaging in an ultraviolet band.
The small-field ultraviolet objective optical system is characterized by sequentially comprising the following components from an object side to an image side along an optical axis: a first lens group having positive optical power and a second lens group having positive optical power,
the first lens group sequentially comprises from the object side to the image side along the optical axis: the lens comprises a first positive lens, a first negative lens, a second positive lens, a diaphragm, a third positive lens and a second negative lens.
The second lens group sequentially includes, from the object side to the image side along the optical axis: a fourth positive lens and a third negative lens.
Optionally, during focusing, the second lens group moves between the first lens group and the image plane. The objective lens adopts an internal focusing structure to realize conjugate imaging of different object distances.
Optionally, the focal length f of the first lens group1The focal length of the second lens group is f2And satisfies the following conditions: f is more than or equal to 0.122/f1|≤0.45。
Optionally, each lens optical material in the first lens group is selected from fused silica and/or fluoride; and the optical material of each lens in the second lens group is selected from fused quartz and/or fluoride.
By adopting the materials, the first lens group and the second lens group can realize 200-380 nm ultraviolet band optical imaging.
Optionally, each lens in the first lens group is a spherical lens; each lens in the second lens group is a spherical lens.
Optionally, the relative aperture value is F1.8 ~ 4.0.
Optionally, the interval between the first positive lens and the first negative lens is 0.1-0.2 f; the interval between the first negative lens and the second positive lens is 0.0005-0.0006 f; the distance between the second positive lens and the diaphragm is 0.5-0.6 f; the interval between the third positive lens and the second negative lens is 0.0005-0.0006 f;
the second lens group sequentially includes, from the object side to the image side along the optical axis: the interval between the fourth positive lens and the third negative lens is 0.01f, wherein f is the focal length of the small-field ultraviolet objective optical system. For example, 200 f.
Optionally, the first positive lens and the first negative lens are spaced by 0.225 f; the interval between the first negative lens and the second positive lens is 0.0005 f; the interval between the second positive lens and the diaphragm is 0.5 f; the third positive lens and the second negative lens have an interval of 0.0005 f;
the second lens group sequentially includes, from the object side to the image side along the optical axis: the interval between the fourth positive lens and the third negative lens is 0.01f, wherein f is the focal length of the small-field ultraviolet objective optical system.
The optical system is particularly suitable for imaging at long distances up to infinity.
Optionally, the first positive lens is spaced from the first negative lens by 36.73 mm; the interval between the first negative lens and the second positive lens is 0.1 mm; the interval between the second positive lens and the diaphragm is 123 mm; the interval between the third positive lens and the second negative lens is 0.17 mm;
the second lens group sequentially includes, from the object side to the image side along the optical axis: the interval between the fourth positive lens and the third negative lens is 2 mm.
The optical system is particularly suitable for imaging within a short distance of 2 m.
According to yet another aspect of the present application, there is provided an ultraviolet objective lens including the small-field-of-view ultraviolet objective lens optical system as described above. The ultraviolet objective lens can be assembled by packaging the optical system in the shell.
According to yet another aspect of the present application, there is provided an ultraviolet detector comprising an ultraviolet objective lens as described above. The ultraviolet objective lens can be assembled by packaging the optical system in the shell.
The ultraviolet objective lens can also be applied to a small-field ultraviolet detector by the skilled person according to the needs. The objective lens can be obtained by packaging the optical system in a shell, arranging a spherical cover on the object side of the shell, and arranging an imaging surface with an optical sensor on the image side of the shell.
The beneficial effects that this application can produce include:
1) the small-field-of-view ultraviolet objective optical system provided by the application adopts two common ultraviolet optical materials, and the large-aperture long-focus system with 7 pieces of 7 groups of optical structures is optimally designed, so that the relative aperture F value reaches 2.0, and the central resolution reaches more than 100 pairs. The relative aperture F value of the lens reaches 2.0, the image brightness of ultraviolet imaging can be effectively improved, and the detection sensitivity and the imaging quality of weak signal ultraviolet images are improved.
2) The small-view-field ultraviolet objective optical system provided by the application adopts an internal focusing mode to carry out focusing, and can effectively solve the difficult problem of difficult focusing of a large-aperture long-focus lens. The internal focusing mode can partially compensate the changes of spherical aberration, coma aberration, astigmatism and field curvature of an optical system caused by the change of an object space aperture angle in the process of changing the object distance, keeps the high-resolution image quality of the whole focusing process, and has more excellent image quality consistency compared with the whole group of focusing structures;
3) according to the small-field-of-view ultraviolet objective optical system, the existing large-aperture small-field-of-view optical system generally has the problem that the system weight is too heavy due to the large aperture of a lens, and further a series of problems such as large focusing inertia, difficulty in gravity center balancing and the like are caused to a focusing mechanism;
4) according to the small-field-of-view ultraviolet objective optical system, all lenses are spherical lenses, so that the processing manufacturability and the assembling convenience of an ultraviolet band optical material are guaranteed;
drawings
FIG. 1 is a schematic diagram of a small-field ultraviolet objective optical system in one embodiment of the present disclosure;
fig. 2 is a schematic view of an optical structure of a small-field ultraviolet objective optical system in an embodiment of the present application at infinite object distances of 10 meters and 5 meters, respectively; wherein in (a) the object distance is infinity; (b) the distance between the middle objects is 10 meters; (c) the distance between the objects is 5 m;
FIG. 3 is a graph of an optical transfer function (MTF) of a small field ultraviolet objective optical system at an object distance of infinity according to an embodiment of the present disclosure;
FIG. 4 is a graph of an optical transfer function (MTF) of a small field ultraviolet objective optical system at an object distance of 10m according to an embodiment of the present disclosure;
FIG. 5 is a graph of an optical transfer function (MTF) of a small field ultraviolet objective optical system at an object distance of 5m according to an embodiment of the present disclosure;
FIG. 6 is a graph of chromatic aberration, field curvature, and distortion for an ultraviolet objective optical system with a small field of view at an infinite object distance in one embodiment of the present application, where (a) is a graph of chromatic aberration; (b) is a field curvature curve graph; (c) is a distortion plot;
FIG. 7 is a graph of chromatic aberration, field curvature, and distortion for a small field of view UV objective optical system at an object distance of 10m in one embodiment of the present application, wherein (a) is a graph of chromatic aberration; (b) is a field curvature curve graph; (c) is a distortion plot;
FIG. 8 is a graph of chromatic aberration, field curvature, and distortion for a small field of view UV objective optical system at an object distance of 5m in one embodiment of the present application, wherein (a) is a graph of chromatic aberration; (b) is a field curvature curve graph; (c) is a distortion plot;
FIG. 9 is a schematic view of an optical structure of a small-field ultraviolet objective optical system in another embodiment of the present application at object distances of 2m, 1.5m, and 1m, respectively; wherein the object distance in (a) is 2 m; (b) the distance between the objects is 1.5 m; (c) the distance between the objects is 1 m;
FIG. 10 is a graph of the optical transfer function (MTF) of a small field UV objective optical system at an object distance of 2m in accordance with yet another embodiment of the present application;
FIG. 11 is a graph of the optical transfer function (MTF) of a small field UV objective optical system at an object distance of 1.5m in accordance with yet another embodiment of the present application;
FIG. 12 is a graph of the optical transfer function (MTF) of a small field UV objective optical system at an object distance of 1m according to yet another embodiment of the present application;
FIG. 13 is a graph of chromatic aberration, field curvature, and distortion for a small field of view UV objective optical system at an object distance of 2m in one embodiment of the present application, wherein (a) is a graph of chromatic aberration; (b) is a field curvature curve graph; (c) is a distortion plot;
FIG. 14 is a graph of chromatic aberration, field curvature, and distortion for a small field of view UV objective optical system at an object distance of 1.5m in one embodiment of the present application, wherein (a) is a graph of chromatic aberration; (b) is a field curvature curve graph; (c) is a distortion plot;
FIG. 15 is a graph of chromatic aberration, field curvature, and distortion for a small field of view UV objective optical system at an object distance of 1m in one embodiment of the present application, wherein (a) is a graph of chromatic aberration; (b) is a field curvature curve graph; (c) is a distortion plot;
list of parts and reference numerals:
| name of component | Reference numerals |
| A first positive lens | L1 |
| First negative lens | L2 |
| Second positive lens | L3 |
| Diaphragm | A1 |
| Third positive lens | L4 |
| Second negative lens | L5 |
| Fourth positive lens | L6 |
| Third negative lens | L7 |
| First lens group | U1 |
| Second lens group | U2 |
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Example 1 Small field of view UV Objective lens optical System
Referring to fig. 1, the present application provides a small field of view uv objective optical system comprising: the optical lens comprises a first lens group U1 with positive focal power and a second lens group U2 with positive focal power, wherein the first lens group U1 and the second lens group U2 are arranged in sequence from an object side to an image side along an optical axis, and the focal length f of the first lens group1The focal length of the second lens group is f2And satisfies the following conditions: f is more than or equal to 0.122/f1|≤0.45。
The first lens group includes a first positive lens L1, a first negative lens L2, a second positive lens L3, a stop a1, a third positive lens L4, and a second negative lens L5, which are arranged in order from the object side to the image side along the optical axis. The total power of the first lens group is positive. The focusing group U2 is composed of a positive lens L6 and a negative lens L7, and its total power is positive.
The second lens group includes a fourth positive lens L6 and a third negative lens L7 arranged in order from the object side to the image side along the optical axis. The total focal power of the second lens group is positive.
Each lens in the first lens group and the second lens group is a spherical lens made of fused quartz and calcium fluoride materials, and the first lens group and the second lens group can realize 200-380 nm ultraviolet band optical imaging.
When focusing is carried out, the relative position of the whole first lens group U1 and an imaging surface is fixed, and the second lens group U2 moves between the first lens group U1 and an image surface, so that conjugate imaging of different object distances is realized.
The application is an internal focusing structure large-aperture small-view-field ultraviolet objective optical system, the implementation mode of the internal focusing structure large-aperture small-view-field ultraviolet objective optical system can optimally design different optical structures aiming at different object distance types, and the following implementation schemes are adopted in two different object distance application occasions:
example 2 Small field of view UV Objective optical System for Infinite object distance imaging
The small-field-of-view ultraviolet objective optical system in the embodiment is used for ultraviolet band imaging with the object distance ranging from 5 meters to infinity.
The difference from embodiment 1 is the normalization parameters of the optical system, which are shown in table 1 in this embodiment:
TABLE 1
| Surface of | Type (B) | Radius of curvature | Thickness of | Optical material | Bore diameter | Labeling |
| Article surface | Infinite number of elements | Infinite number of elements | ||||
| 1 | Spherical surface | 227.96 | 25 | CAF2 | 100 | L1 |
| 2 | Spherical surface | -227.96 | 45 | 100 | ||
| 3 | Spherical surface | -125.33 | 12 | SILICA | 80 | L2 |
| 4 | Spherical surface | 83.55 | 0.1 | 80 | ||
| 5 | Spherical surface | 83.55 | 25 | CAF2 | 78 | L3 |
| 6 | Spherical surface | -453.53 | 110.11 | 78 | ||
| Diaphragm | Infinite number of elements | 0.1 | 62.8 | A1 | ||
| 8 | Spherical surface | 82.89 | 23.82 | CAF2 | 63 | L4 |
| 9 | Spherical surface | -175.27 | 0.1 | 57 | ||
| 10 | Spherical surface | Infinite number of elements | 5 | SILICA | 57 | L5 |
| 11 | Spherical surface | 55.74 | 6.54 | 51 | ||
| 12 | Reference plane | Infinite number of elements | 8.5762 | |||
| 13 | Spherical surface | 70.23 | 12.3 | CAF2 | 50 | L6 |
| 14 | Spherical surface | -95.57 | 2 | 50 | ||
| 15 | Spherical surface | -78.24 | 25 | SILICA | 48 | L7 |
| 16 | Spherical surface | -253.94 | 52.1238 | 40 | ||
| 17 | Reference plane | Infinite number of elements | 25 | |||
| Image plane | Infinite number of elements | 10.0 |
The results obtained are shown in FIGS. 2 to 8,
as can be seen from fig. 2, the object distance in fig. 2(a) is infinity; in FIG. 2(b), the object distance is 10 m;
in fig. 2(c), the object distance is 5m, and the focusing group moves forward as the object distance is reduced;
as can be seen from FIG. 3, in the present application, at an infinite object distance, an optical transfer function (MTF) curve of an image is reflected at a spatial frequency of 80 line pairs/mm, and a transfer function value of each field of view reaches or approaches 0.3;
as can be seen from FIG. 4, in the present application, at an object distance of 10 meters, an optical transfer function (MTF) curve of an image is reflected at a spatial frequency of 80 line pairs/mm, and a transfer function value of each field exceeds 0.3;
as can be seen from FIG. 5, in the present application, at an object distance of 5 meters, the optical transfer function (MTF) curve of the image is reflected at a spatial frequency of 80 line pairs/mm, and the transfer function value of each field of view reaches or approaches 0.3;
as can be seen from FIG. 6, the chromatic aberration of FIG. 6(a) is less than 0.08mm, the field curvature of FIG. 6(b) is within + -0.08 mm, and the distortion of the full-field image of FIG. 6(c) is within 0.02% at infinite object distance;
as can be seen from FIG. 7, the chromatic aberration of FIG. 7(a) is less than 0.08mm at an object distance of 10 meters, the field curvature of FIG. 7 (b) is within + -0.08 mm, and the distortion of the full-field image of FIG. 7(c) is within 0.02%;
as can be seen from FIG. 8, the chromatic aberration of FIG. 8(a) is less than 0.08mm at an object distance of 5 meters, the field curvature of FIG. 8 (b) is within + -0.08 mm, and the distortion of the full-field image of FIG. 8(c) is within 0.02%;
the above design results were obtained by simulation calculation using Code V optical design software of ORA corporation, usa.
Example 3 Small field of view UV Objective optical System for Limited distance object imaging
The optical system in the embodiment is mainly used for imaging when the object distance ranges from 1 meter to 2 meters.
The difference from embodiment 1 is the normalization parameters of the optical system, which are shown in table 2 in this embodiment:
TABLE 2
| Surface of | Type (B) | Radius of curvature | Thickness of | Optical material | Bore diameter | Labeling |
| Article surface | Infinite number of elements | 2000 | ||||
| 1 | Spherical surface | 181.531 | 25 | CAF2 | 100 | L1 |
| 2 | Spherical surface | -181.531 | 36.73 | 100 | ||
| 3 | Spherical surface | -108.383 | 12 | SILICA | 80 | L2 |
| 4 | Spherical surface | 69.02 | 0.1 | 80 | ||
| 5 | Spherical surface | 69.02 | 20 | CAF2 | 80 | L3 |
| 6 | Spherical surface | -331 | 123 | 80 | ||
| Diaphragm | Infinite number of elements | 0.62 | 55.5 | A1 | ||
| 8 | Spherical surface | 75 | 12.18 | CAF2 | 54 | L4 |
| 9 | Spherical surface | -173.255 | 0.17 | 54 | ||
| 10 | Spherical surface | Infinite number of elements | 8 | SILICA | 54 | L5 |
| 11 | Spherical surface | 51.4 | 6.39 | 46 | ||
| 12 | Reference plane | Infinite number of elements | 18.237 | |||
| 13 | Spherical surface | 62.616 | 12.3 | CAF2 | 46 | L6 |
| 14 | Spherical surface | -87.74 | 2 | 46 | ||
| 15 | Spherical surface | -72.379 | 25 | SILICA | 46 | L7 |
| 16 | Spherical surface | -288.541 | 42.463 | 46 | ||
| 17 | Reference plane | Infinite number of elements | 25.107 | |||
| Image plane | Infinite number of elements | 12.65 |
The results obtained are shown in FIGS. 9 to 15,
as can be seen from fig. 9, the object distance in fig. 9(a) is 2 meters; FIG. 9(b) shows an object distance of 1.5 m; in fig. 9(c), the object distance is 1 meter, and the focusing group moves forward as the object distance is reduced;
as can be seen from fig. 10, in the present application, at an object distance of 2 meters, an optical transfer function (MTF) curve of an image is reflected at a spatial frequency of 80 line pairs/mm, and a transfer function value of each field of view reaches or approaches 0.3;
as can be seen from fig. 11, in the present application, at an object distance of 1.5m, an optical transfer function (MTF) curve of an image is reflected under a spatial frequency of 80 line pairs/mm, and a transfer function value of each field of view reaches 0.3;
as can be seen from fig. 12, in the present application, at an object distance of 1 meter, an optical transfer function (MTF) curve of an image is reflected at a spatial frequency of 50 line pairs/mm, and a transfer function value of each field of view reaches or approaches 0.3;
as can be seen from fig. 13, the present application shows that at 2 meters object distance, (a) the chromatic aberration is less than 0.1mm, (b) the field curvature is within ± 0.08mm, and (c) the full-field image distortion is within 0.02%;
as can be seen from fig. 14, the present application has (a) a chromatic aberration of less than 0.08mm, (b) a field curvature within ± 0.08mm, and (c) a full field-of-view image distortion within 0.02% at an object distance of 1.5 m;
as can be seen from fig. 15, the present application shows that at 1 meter object distance, (a) the chromatic aberration is less than 0.2mm, (b) the field curvature is within ± 0.08mm, and (c) the full-field image distortion is within 0.02%;
the above design results were obtained by simulation calculation using Code V optical design software of ORA corporation, usa.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. An optical system for a small field of view ultraviolet objective lens, comprising, in order from an object side to an image side along an optical axis: a first lens group having positive optical power and a second lens group having positive optical power,
the first lens group sequentially comprises from the object side to the image side along the optical axis: the lens comprises a first positive lens, a first negative lens, a second positive lens, a diaphragm, a third positive lens and a second negative lens;
the second lens group sequentially includes, from the object side to the image side along the optical axis: a fourth positive lens and a third negative lens.
2. The small field of view uv objective optical system of claim 1, wherein the second lens group is moved between the first lens group and the image plane during focusing.
3. The small field of view uv objective lens optical system of claim 1, wherein the focal length f of the first lens group1The focal length of the second lens group is f2And satisfies the following conditions: f is more than or equal to 0.122/f1|≤0.45。
4. The small field of view uv objective lens optical system of claim 1, wherein each lens optical material in the first lens group is selected from fused silica and/or fluoride;
and the optical material of each lens in the second lens group is selected from fused quartz and/or fluoride.
5. The small field of view uv objective optical system of claim 1, wherein each lens in the first lens group is a spherical lens;
each lens in the second lens group is a spherical lens.
6. The small-field-of-view ultraviolet objective optical system as claimed in claim 1, wherein the small-field-of-view ultraviolet objective optical system has a relative aperture value of F1.8 to 4.0.
7. The small field of view ultraviolet objective optical system of claim 1, wherein the first positive lens and the first negative lens are spaced 0.1-0.2 f apart;
the interval between the first negative lens and the second positive lens is 0.0005-0.0006 f;
the distance between the second positive lens and the diaphragm is 0.5-0.6 f;
the interval between the third positive lens and the second negative lens is 0.0005-0.0006 f;
the second lens group sequentially includes, from the object side to the image side along the optical axis: the interval between the fourth positive lens and the third negative lens is 0.01f, wherein f is the focal length of the small-field ultraviolet objective optical system.
8. The small field of view ultraviolet objective optical system of claim 7, wherein the first positive lens is spaced 0.225f from the first negative lens;
the interval between the first negative lens and the second positive lens is 0.0005 f;
the interval between the second positive lens and the diaphragm is 0.5 f;
the third positive lens and the second negative lens have an interval of 0.0005 f;
the second lens group sequentially includes, from the object side to the image side along the optical axis: the interval between the fourth positive lens and the third negative lens is 0.01f, wherein f is the focal length of the small-field ultraviolet objective optical system.
9. An ultraviolet objective lens comprising the small field of view ultraviolet objective lens optical system according to any one of claims 1 to 8.
10. An ultraviolet detector, characterized by comprising the ultraviolet objective lens as claimed in claim 9.
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| CN201920007320.8U CN209842204U (en) | 2019-01-03 | 2019-01-03 | Small-field-of-view ultraviolet objective optical system, ultraviolet objective and ultraviolet detector |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633872A (en) * | 2019-01-03 | 2019-04-16 | 中国科学院福建物质结构研究所 | Small field of view ultraviolet object lens optical system, ultraviolet object lens, ultraviolet detector |
| CN115047595A (en) * | 2022-07-12 | 2022-09-13 | 广州长步道光学科技有限公司 | Ultraviolet band large-aperture industrial imaging lens |
| CN118033875A (en) * | 2024-04-09 | 2024-05-14 | 宁波舜宇光电信息有限公司 | Wide-angle focusing optical imaging lens and imaging equipment |
-
2019
- 2019-01-03 CN CN201920007320.8U patent/CN209842204U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633872A (en) * | 2019-01-03 | 2019-04-16 | 中国科学院福建物质结构研究所 | Small field of view ultraviolet object lens optical system, ultraviolet object lens, ultraviolet detector |
| CN109633872B (en) * | 2019-01-03 | 2024-06-11 | 中国科学院福建物质结构研究所 | Small-view-field ultraviolet objective optical system, ultraviolet objective and ultraviolet detector |
| CN115047595A (en) * | 2022-07-12 | 2022-09-13 | 广州长步道光学科技有限公司 | Ultraviolet band large-aperture industrial imaging lens |
| CN118033875A (en) * | 2024-04-09 | 2024-05-14 | 宁波舜宇光电信息有限公司 | Wide-angle focusing optical imaging lens and imaging equipment |
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