CN210465833U - High-resolution ultraviolet objective lens - Google Patents
High-resolution ultraviolet objective lens Download PDFInfo
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- CN210465833U CN210465833U CN201921616291.1U CN201921616291U CN210465833U CN 210465833 U CN210465833 U CN 210465833U CN 201921616291 U CN201921616291 U CN 201921616291U CN 210465833 U CN210465833 U CN 210465833U
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Abstract
The utility model discloses a high resolution ultraviolet objective includes from the object plane to image plane along the optical axis in proper order: a first lens having a positive refractive power; a second lens having a positive refractive power; a third lens having a negative refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power; a sixth lens having a positive refractive power. The utility model discloses be applied to ultraviolet image intensifier, image planes size 18 mm. The optical lens is composed of 6 lenses in total, the number of the lenses is small, and the structure is simple. Different lenses are combined with each other and the focal power is reasonably distributed, so that the high-resolution and long-back intercept excellent performances are realized.
Description
Technical Field
The utility model belongs to the technical field of optics, especially, relate to a be applied to high resolution ultraviolet objective of shortwave ultraviolet image intensifier.
Background
The ultraviolet technology has the excellent technical characteristics and is widely applied in the fields of military affairs, investigation, space detection and the like. The transmittance of most optical materials decreases with decreasing wavelength, the two most common materials for the ultraviolet band being calcium fluoride and fused silica. Due to the short wave characteristic of an ultraviolet band, the optical system is strongly intrinsic birefringence due to the design of only calcium fluoride, and the resolution of the system is seriously influenced; when only fused quartz is used for design, the system is subjected to large chromatic aberration. Therefore, the two materials are selected to be designed together so as to achieve better imaging quality, the positive lens is made of calcium fluoride, and the negative lens is made of fused quartz material.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an ultraviolet objective of less high resolution of volume.
In order to achieve the above object, the utility model discloses a technical scheme include: a high-resolution ultraviolet objective optical system comprising, in order from an object side to an image side: the lens comprises a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5) and a sixth lens (6).
Furthermore, the object side surface of the first lens (1) is a convex surface, the image side surface is a concave surface, and the focal power of the first lens is positive; the first lens (1) is a meniscus positive lens, and the glass material is calcium fluoride.
Furthermore, the object side surface of the second lens (2) is a convex surface, the image side surface is a convex surface, and the diopter of the second lens is positive; the second lens (2) is a biconvex positive lens, and the glass material is calcium fluoride.
Furthermore, the object side surface of the third lens (3) is a concave surface, the image side surface is a concave surface, and the diopter of the third lens is negative; the third lens (3) is a double-concave negative lens, and the glass material is fused quartz.
Furthermore, the object side surface of the fourth lens (4) is a concave surface, the image side surface is a concave surface, and the diopter of the fourth lens is negative; the fourth lens (4) is a negative lens, the glass material is fused quartz, and a diaphragm (8) of the optical system is positioned on the object side surface of the fourth lens.
Furthermore, the object side surface of the fifth lens (5) is a convex surface, the image side surface is a convex surface, and the diopter of the fifth lens is positive. The fifth lens (5) is a biconvex positive lens, and the glass material is calcium fluoride.
Furthermore, the object side surface of the sixth lens element (6) is convex, the image side surface is convex, and the diopter of the sixth lens element is positive. The sixth lens (6) is a biconvex positive lens, and the glass material is calcium fluoride.
The utility model discloses, optical lens comprises 6 pieces of lenses totally, and the lens number is few, simple structure. Under the general condition positive lens produce negative colour difference, negative lens produce positive colour difference, so can have after adopting positive negative lens veneer to play the positive negative effect of school to the system colour difference, but owing to the unable transmission ultraviolet wave band of double-glue lens structure, consequently adopt the utility model discloses the system colour difference is eliminated to modified disconnect-type lens structure.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic view of the optical structure of the high-resolution uv objective of the present invention;
wherein: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens;
6. a sixth lens; 7. a detector focal plane; 8. and (4) a diaphragm.
Fig. 2 is a diagram of the transfer function of the high-resolution uv objective of the present invention;
fig. 3 is a diffuse speckle pattern of the high-resolution uv objective of the present invention;
FIG. 4 is a field curvature and distortion diagram of the high resolution UV objective of the present invention;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is an optical structure diagram of the high-resolution ultraviolet objective of the present invention.
As shown in the figure, the utility model relates to a high resolution ultraviolet objective includes by the object space to the image space along the optical axis in proper order: a first lens 1 having a positive power, a second lens 2 having a positive power, a third lens 3 having a negative power, a fourth lens 4 having a negative power, a fifth lens 5 having a positive power, and a sixth lens 6 having a positive power.
In the embodiment of the present invention, the first lens 1 is a meniscus positive lens, and the glass material is calcium fluoride.
The second lens 2 is a biconvex lens and the glass material is calcium fluoride.
The third lens 3 is a double-concave negative lens, and the glass material is fused quartz.
The fourth lens 4 is a double concave negative lens, the glass material is fused quartz, and a diaphragm 8 of the optical system is positioned on the object side surface of the fourth lens 4.
The fifth lens 5 is a biconvex positive lens, and the glass material is calcium fluoride.
The sixth lens 6 is a biconvex positive lens, and the glass material is calcium fluoride.
In order to improve the optical performance of the whole lens group, some lenses need to be specially designed to satisfy a specific expression so as to achieve a better imaging effect. In this example, f1，2，3218.91mm, and f 50 mm. The first lens 1, the second lens 2, and the third lens 3 satisfy the following expressions:
3＜f1，2，3/f＜5
in the formula (f)1，2，3Is the combined focal length of the first lens 1, the second lens 2 and the third lens 3; f denotes a focal length of the entire lens group.
After the expression is satisfied, the image quality requirement of the integral optical system can be ensured.
Light beams from a target sequentially pass through a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a diaphragm 9, a fifth lens 5 and a sixth lens 6 and then are converged on a focal plane 7 of a detector to form an image.
Specifically, in this embodiment, the focal length f of the optical system is designed for an ultraviolet detector with a target surface of phi 18 mm: 50mm, F number: 3, field of view: 20.4 degrees. More specifically, to improve image quality and improve system chromatic aberration, an improved split lens structure is adopted.
Fig. 2 to fig. 4 are graphs of imaging optical simulation data of the high-resolution uv objective of the present invention, in which fig. 2 is a graph of optical transfer function (MTF), a horizontal axis is logarithm per millimeter (lp/mm), a vertical axis is a contrast value, fig. 3 is a plot, and fig. 4 is a graph of field curvature and distortion.
Finally, it should be noted that: the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Therefore, although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted; all such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and within the scope of the following claims.
Claims (9)
1. A high resolution uv objective lens comprising, in order from the object side to the image side: a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), and a sixth lens (6); the object side surface of the first lens (1) is a convex surface, the image side surface of the first lens is a concave surface, and the diopter of the first lens is positive; the object side surface of the second lens (2) is a convex surface, the image side surface is a convex surface, and the diopter of the second lens is positive; the object side surface of the third lens (3) is a concave surface, the image side surface is a concave surface, and the diopter of the third lens is negative; the object side surface of the fourth lens (4) is a concave surface, the image side surface is a concave surface, and the diopter of the fourth lens is negative; the object side surface of the fifth lens (5) is a convex surface, the image side surface of the fifth lens is a convex surface, and the diopter of the fifth lens is positive; the object side surface of the sixth lens (6) is a convex surface, the image side surface is a convex surface, and the diopter of the sixth lens is positive.
2. The high resolution uv objective lens according to claim 1, characterized in that the first lens (1) is a meniscus positive lens and the glass material is calcium fluoride.
3. The high resolution uv objective lens according to claim 1, characterized in that the second lens (2) is a biconvex positive lens and the glass material is calcium fluoride.
4. The high resolution uv objective lens according to claim 1, characterized in that the third lens (3) is a biconcave negative lens and the glass material is fused silica.
5. The high-resolution uv objective according to claim 1, characterized in that the fourth lens (4) is a biconcave negative lens, the glass material is fused silica, and the stop (8) of the optical system is located on the object-side face of the fourth lens.
6. The high resolution uv objective lens according to claim 1, characterized in that the fifth lens (5) is a biconvex positive lens and the glass material is calcium fluoride.
7. The high resolution uv objective lens according to claim 1, characterized in that the sixth lens (6) is a biconvex positive lens and the glass material is calcium fluoride.
8. The high resolution uv objective lens according to claim 1, characterized in that the first lens (1), the second lens (2), the third lens (3) satisfy the following expression:
3＜f1，2，3/f＜5
in the formula (f)1，2，3Is the combined focal length of the first lens (1), the second lens (2) and the third lens (3); f denotes a focal length of the entire lens group.
9. The high resolution uv objective lens according to any one of claims 1 to 8, wherein the lens is fixed and the high resolution uv objective optical system is a non-movable fixed focus lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921616291.1U CN210465833U (en) | 2019-09-26 | 2019-09-26 | High-resolution ultraviolet objective lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921616291.1U CN210465833U (en) | 2019-09-26 | 2019-09-26 | High-resolution ultraviolet objective lens |
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| Publication Number | Publication Date |
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| CN210465833U true CN210465833U (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921616291.1U Active CN210465833U (en) | 2019-09-26 | 2019-09-26 | High-resolution ultraviolet objective lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589497A (en) * | 2021-08-11 | 2021-11-02 | 福州英迪格成像技术有限公司 | Ultraviolet lens for limited conjugate distance imaging |
| CN114415361A (en) * | 2022-02-28 | 2022-04-29 | 复旦大学 | Deep ultraviolet microscope imaging objective lens and visible light assembling and correcting method and structure thereof |
-
2019
- 2019-09-26 CN CN201921616291.1U patent/CN210465833U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589497A (en) * | 2021-08-11 | 2021-11-02 | 福州英迪格成像技术有限公司 | Ultraviolet lens for limited conjugate distance imaging |
| CN113589497B (en) * | 2021-08-11 | 2022-08-05 | 福州英迪格成像技术有限公司 | Ultraviolet lens for limited conjugate distance imaging |
| CN114415361A (en) * | 2022-02-28 | 2022-04-29 | 复旦大学 | Deep ultraviolet microscope imaging objective lens and visible light assembling and correcting method and structure thereof |
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