CN217846765U - Low-distortion high-resolution continuous zooming optical system - Google Patents
Low-distortion high-resolution continuous zooming optical system Download PDFInfo
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- CN217846765U CN217846765U CN202221674757.5U CN202221674757U CN217846765U CN 217846765 U CN217846765 U CN 217846765U CN 202221674757 U CN202221674757 U CN 202221674757U CN 217846765 U CN217846765 U CN 217846765U
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Abstract
The utility model provides a low distortion high resolution zooms optical system in succession, including preceding fixed mirror group, focusing mirror group, diaphragm, compensation mirror group and image planes, preceding fixed mirror group is including first convex-concave lens, second convex-concave lens and third concave-flat lens, focusing mirror group includes fourth convex-concave lens, fifth biconcave lens and sixth biconvex lens, the diaphragm is adjustable light ring, compensation mirror group includes seventh convex-concave lens, eighth convex-concave lens, ninth biconvex lens, tenth meniscus lens, eleventh biconvex lens and twelfth meniscus lens, eighth convex-concave lens and ninth biconvex lens constitute first cemented mirror group, eleventh biconvex lens and twelfth meniscus lens constitute second cemented mirror group, in the motion process of zooming, focusing mirror group and compensation mirror group can follow light path direction of propagation back-and-forth movement respectively, the utility model discloses have high resolution, the performance of low distortion, satisfy high-end product demand.
Description
Technical Field
The utility model belongs to the technical field of the zoom lens technique and specifically relates to indicate a low distortion high resolution zooms optical system in succession.
Background
With the development and progress of the related technologies in the field of photoelectric technology, people put forward higher requirements on photoelectric imaging technology products, such as light weight, integration, high resolution and the like. The zoom optical lens can meet the functions of target capture in a large view field and detail resolution in a small view field, and has important application in the aspects of security monitoring, forest fire prevention, traffic safety and the like. Most zoom optical lenses in the current market are poor in imaging definition and distortion rate, and cannot meet the application requirements of high resolution, low distortion and the like in the new and advanced times.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
An object of the utility model is to provide a low distortion high resolution zooms optical system in succession has the performance of high resolution, low distortion, satisfies high-end product demand. In order to achieve the above purpose, the utility model adopts the following technical proposal:
(II) technical scheme
A low-distortion high-resolution continuous zooming optical system comprises a front fixed lens group, a focusing lens group, a diaphragm, a compensating lens group and an image surface, wherein the front fixed lens group, the focusing lens group, the diaphragm, the compensating lens group and the image surface are sequentially arranged along a light path propagation direction, the front fixed lens group comprises a first convex-concave lens, a second convex-concave lens and a third concave-flat lens, the first convex-concave lens, the second convex-concave lens and the third concave-flat lens are sequentially arranged along the light path propagation direction, the focusing lens group comprises a fourth convex-concave lens, a fifth biconcave lens and a sixth biconvex lens, the diaphragm is an adjustable aperture, the compensating lens group comprises a seventh convex-concave lens, an eighth convex-concave lens, a ninth biconvex lens, a tenth convex-concave lens, an eleventh biconvex lens and a twelfth convex-concave lens, the seventh convex-concave lens, the eighth convex-concave lens and the ninth biconvex lens are sequentially arranged along the light path propagation direction, and the eleventh biconvex lens and the twelfth biconvex lens constitute a second cemented lens group.
Further, the focal length of the optical system is 8-50mm, and the F number is F/2.8-F/4.
Furthermore, the maximum clear aperture of the optical system is phi 8.4mm, and the maximum optical cylinder length is less than 82.1mm.
(III) advantageous effects
Compared with the prior art, the utility model have obvious advantage and beneficial effect, particularly, the utility model discloses the structure is suitable for the target surface and is 1/2 inch, and the distortion is less than 3%, and its resolution ratio can reach 150lp/mm, has the performance of high resolution, low distortion, can satisfy high-end product demand, and through adjusting focusing mirror group and compensating mirror group and realizing zooming function, its clear aperture also can be adjusted in a flexible way.
Drawings
FIG. 1 is a diagram of the structure of an optical system of the present invention when the focal length is 8 mm;
FIG. 2 is a graph of MTF vs FLD of the optical system of the present invention at a focal length of 8 mm;
fig. 3 is a field curvature distortion diagram of the optical system of the present invention when the focal length is 8 mm.
Fig. 4 is a structural diagram of the optical system of the present invention when the focal length is 50 mm;
FIG. 5 is a graph of MTF vs FLD of the optical system of the present invention at a focal length of 50 mm;
fig. 6 is a field curvature distortion diagram of the optical system of the present invention at a focal length of 50 mm.
The reference numbers illustrate:
1. a front fixed lens group 11, a first convex-concave lens 12 and a second convex-concave lens
13. A third convex-concave lens 2, a focusing lens group 21 and a fourth convex-concave lens
22. Fifth biconcave lens 23, sixth biconvex lens 3, diaphragm
4. A compensating lens group 41, a seventh convex-concave lens 42 and an eighth convex-concave lens
43. Ninth biconvex lens 44, tenth meniscus lens 45, eleventh biconvex lens
46. Twelfth meniscus lens 5 and image plane
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1 to 6, a low-distortion high-resolution continuous zooming optical system includes a front fixed lens group 1, a focusing lens group 2, a diaphragm 3, a compensating lens group 4 and an image plane 5, which are sequentially arranged along a propagation direction of an optical path, and reflected light rays sequentially pass through the front fixed lens group 1, the focusing lens group 2, the diaphragm 3, the compensating lens group 4 and the image plane 5 from an object side and then reach a view field of an observer or an image receiving device. The zoom structure design composed of the front fixed lens group 1, the focusing lens group 2, the diaphragm 3, the compensating lens group 4 and the image surface 5, the aberration of the optical system is easier to control, and the image quality is more excellent. Each lens group is described in detail below:
the front fixed lens group 1 comprises a first convex-concave lens 11, a second convex-concave lens 12 and a third concave-flat lens 13 which are sequentially arranged along the propagation direction of a light path, when the front fixed lens group is used, after the working distance is determined, the distance between a lens formed by the optical system and an object is kept unchanged, the focusing lens group 2 and the compensating lens group 4 are adjusted according to requirements, and the size of an aperture is adjusted to meet optical requirements and form a clear high-quality image.
When the focusing lens group 2 is used, the distance between the fourth convex-concave lens 21 and the front fixed lens group 1 is adjusted, and after the focal length of the lens group is determined, the image distance is changed, so that the distance from an imaging surface 5 to the optical center is equal to the image distance, and a shot object presents a clear image. The focusing lens group 2 is used for adjusting the focal length of the optical system to realize the change of the focal length from short to long, when the focal length is larger, the visual field area is smaller, the magnification ratio is larger, when the focal length is smaller, the visual field area is larger, the magnification ratio is smaller, a proper focal length is selected according to the observation requirement in the actual use process, and the continuous zooming optical system with the focal length of 8mm-50mm can realize the continuous zooming by adjusting the focusing lens group 2.
The diaphragm 3 is an adjustable diaphragm and is positioned between the focusing lens group 2 and the compensating lens group 4, and when the adjustable diaphragm is used, after the working distance and the focal length are determined, the size of the diaphragm can be adjusted, the light transmission amount is controlled, and clearer imaging is obtained.
The compensating lens group 4 includes a seventh convex-concave lens 41, an eighth convex-concave lens 42, a ninth biconvex lens 43, a tenth concave-convex lens 44, an eleventh biconvex lens 45, and a twelfth concave-convex lens 46, which are sequentially arranged along the propagation direction of the light path, the eighth convex-concave lens 42 and the ninth biconvex lens 43 form a first cemented lens group, the eleventh biconvex lens 45 and the twelfth concave-convex lens 46 form a second cemented lens group, and the compensating lens group 4 collects light rays so that image reflection light rays are converged on the visual field of an observer or an image receiving device after passing through the compensating lens group 4. When the optical lens is used, the compensating lens group 4 and the focusing lens group 2 move together according to a designed optimal curve, and the compensating lens group 4 is used for compensating aberration generated after light passes through the focusing lens group 2, so that the aberration can be eliminated.
In order to enable the compensating lens group 4 and the focusing lens group 2 to be adjusted and moved according to the designed optimal curved track, the focal length of the optical system is 8-50mm, and the F number is F/2.8-F/4; the maximum clear aperture of the optical system is phi 8.4mm, and the maximum optical cylinder length is less than 82.1mm. In the zooming process, the focusing lens group 2 and the compensating lens group 4 respectively make curve motion in an optimal mode according to a certain track after the front fixed lens group 1, so that the overall dimension of the optical system is smaller while the maximum zooming effect is achieved, and the miniaturization of the long-focus high-magnification zoom lens is easier to realize.
The first table below shows data of the radius of curvature, center thickness, refractive index nd, abbe number vd, etc. of each lens at a focal length of 8mm
| Surface number | Curvature | Thickness or air space | Refractive index | Abbe |
| 1 | 86.380 | 1.200 | 1.923 | 20.88 |
| 2 | 38.980 | 1.072 | ||
| 3 | 53.260 | 3.850 | 1.901 | 37.05 |
| 4 | 263.000 | 0.211 | ||
| 5 | 31.400 | 5.700 | 1.620 | 60.37 |
| 6 | Plane surface | 2.582 | ||
| 7 | 147.000 | 1.500 | 1.904 | 31.42 |
| 8 | 9.040 | 3.872 | ||
| 9 | 23.890 | 1.350 | 1.734 | 51.49 |
| 10 | 35.590 | 0.120 | ||
| 11 | 20.740 | 2.500 | 1.923 | 20.88 |
| 12 | 79.000 | 34.097 | ||
| STO | Plane surface | 0.300 | ||
| 14 | 12.760 | 2.500 | 1.741 | 52.68 |
| 15 | 34.950 | 0.100 | ||
| 16 | 15.610 | 1.400 | 1.904 | 31.32 |
| 17 | 7.220 | 4.700 | 1.620 | 60.37 |
| 18 | 47.000 | 2.867 | ||
| 19 | 6.540 | 2.200 | 1.572 | 57.52 |
| 20 | 7.240 | 1.397 | ||
| 21 | 47.000 | 5.900 | 1.532 | 48.85 |
| 22 | 6.650 | 2.700 | 1.904 | 31.32 |
| 23 | 29.790 | 7.384 |
Watch 1
The second table below shows the data of the curvature radius, center thickness, refractive index nd, abbe number vd, etc. of each lens at a focal length of 50mm
| Surface number | Curvature | Thickness or air space | Refractive index | Abbe |
| 1 | 86.380 | 1.200 | 1.923 | 20.882 |
| 2 | 38.980 | 1.072 | ||
| 3 | 53.260 | 3.850 | 1.901 | 37.054 |
| 4 | 263.000 | 0.211 | ||
| 5 | 31.400 | 5.700 | 1.620 | 60.374 |
| 6 | Plane surface | 22.872 | ||
| 7 | 147.000 | 1.500 | 1.904 | 31.420 |
| 8 | 9.040 | 3.872 | ||
| 9 | 23.890 | 1.350 | 1.734 | 51.494 |
| 10 | 35.590 | 0.120 | ||
| 11 | 20.740 | 2.500 | 1.923 | 20.882 |
| 12 | 79.000 | 1.980 | ||
| STO | Plane surface | 0.300 | ||
| 14 | 12.760 | 2.500 | 1.741 | 52.676 |
| 15 | 34.950 | 0.100 | ||
| 16 | 15.610 | 1.400 | 1.904 | 31.318 |
| 17 | 7.220 | 4.700 | 1.620 | 60.374 |
| 18 | 47.000 | 2.867 | ||
| 19 | 6.540 | 2.200 | 1.572 | 57.521 |
| 20 | 7.240 | 1.397 | ||
| 21 | 47.000 | 5.900 | 1.532 | 48.852 |
| 22 | 6.650 | 2.700 | 1.904 | 31.318 |
| 23 | 29.790 | 19.211 |
Watch two
The utility model provides an optical system adopts the focus to be 8-50mm, the F number is F2.8-F4, the biggest clear aperture is phi 8.4mm, the biggest optical cylinder length is less than 82.1mm, its structure is suitable for the target surface and is 1/2 inch, the distortion is less than 3%, its resolution ratio can reach 150lp/mm, have the performance of high-resolution, low distortion, can satisfy high-end product demand, adopt the curve to realize zooming function, its clear aperture also can be adjusted in a flexible way.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modification, equivalent change and modification made to the above embodiments by the technical essence of the present invention are all within the scope of the technical solution of the present invention.
Claims (3)
1. A low distortion high resolution continuous zoom optical system, characterized by: the adjustable aperture diaphragm comprises a front fixed lens group, a focusing lens group, a diaphragm, a compensating lens group and an image surface, wherein the front fixed lens group, the focusing lens group, the diaphragm, the compensating lens group and the image surface are sequentially arranged along a light path propagation direction, the front fixed lens group comprises a first convex-concave lens, a second convex-concave lens and a third concave-flat lens, the first convex-concave lens, the second convex-concave lens and the third concave-flat lens are sequentially arranged along the light path propagation direction, the focusing lens group comprises a fourth convex-concave lens, a fifth double-concave lens and a sixth double-convex lens, the fourth convex-concave lens, the fifth double-concave lens and the sixth double-convex lens are sequentially arranged along the light path propagation direction, the diaphragm is an adjustable aperture diaphragm, the compensating lens group comprises a seventh convex-concave lens, an eighth convex-concave lens, a ninth double-convex lens, a tenth convex-concave lens, an eleventh double-convex lens and a twelfth convex-concave lens, which are sequentially arranged along the light path propagation direction, the eighth convex-concave lens and the ninth double-convex lens constitute a second gluing lens group, and the focusing lens group and the compensating lens group can respectively move back and forth along the light path propagation direction in the zooming process.
2. A low distortion high resolution continuous zoom optical system according to claim 1, wherein: the focal length of the optical system is 8-50mm, and the F number is F/2.8-F/4.
3. A low distortion high resolution continuous zoom optical system according to claim 1 or 2, characterized in that: the maximum clear aperture of the optical system is phi 8.4mm, and the maximum optical cylinder length is less than 82.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221674757.5U CN217846765U (en) | 2022-07-01 | 2022-07-01 | Low-distortion high-resolution continuous zooming optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221674757.5U CN217846765U (en) | 2022-07-01 | 2022-07-01 | Low-distortion high-resolution continuous zooming optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217846765U true CN217846765U (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221674757.5U Active CN217846765U (en) | 2022-07-01 | 2022-07-01 | Low-distortion high-resolution continuous zooming optical system |
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| Country | Link |
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| CN (1) | CN217846765U (en) |
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- 2022-07-01 CN CN202221674757.5U patent/CN217846765U/en active Active
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