CN219695546U - Full-frame fixed-focus optical imaging structure and 35mm industrial lens - Google Patents
Full-frame fixed-focus optical imaging structure and 35mm industrial lens Download PDFInfo
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- CN219695546U CN219695546U CN202320431347.6U CN202320431347U CN219695546U CN 219695546 U CN219695546 U CN 219695546U CN 202320431347 U CN202320431347 U CN 202320431347U CN 219695546 U CN219695546 U CN 219695546U
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 38
- 230000005499 meniscus Effects 0.000 claims description 86
- 239000003292 glue Substances 0.000 claims description 29
- 239000011521 glass Substances 0.000 claims description 13
- 125000005647 linker group Chemical group 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 12
- 238000004026 adhesive bonding Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 8
- 230000004075 alteration Effects 0.000 description 7
- 238000011161 development Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- QXJJQWWVWRCVQT-UHFFFAOYSA-K calcium;sodium;phosphate Chemical compound [Na+].[Ca+2].[O-]P([O-])([O-])=O QXJJQWWVWRCVQT-UHFFFAOYSA-K 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of industrial lenses, and particularly relates to a full-frame fixed-focus optical imaging structure and a 35mm industrial lens. The lens has small volume, low cost, wide application and strong matching performance, has popularization effect, improves the imaging quality and effect while improving the beam quality of the optical imaging structure, and also achieves the purpose of miniaturization while simplifying the layout and structure of the optical imaging structure.
Description
Technical Field
The utility model belongs to the technical field of industrial lenses, and particularly relates to an optical imaging structure with full-frame fixed focus and a 35mm industrial lens.
Background
The basic function of an industrial lens (hereinafter referred to as a lens) is to implement beam conversion (modulation), and in a machine vision system, the main function of the lens is to image a target on a photosensitive surface of an image sensor. The quality of the lens directly influences the overall performance of the machine vision system, and the reasonable selection and installation of the lens is an important link of the design of the machine vision system. Since the lens plays a critical role in the imaging quality, when the lens is deviated, the imaging quality (the main indexes of the imaging quality are resolution, contrast, depth of field and various aberrations) will be affected by the deviation. At present, in order to ensure better imaging quality, most of adopted lenses are complex in structure, large in size and high in cost, and cannot meet the development requirements of modern industrial lenses.
In the prior art, researches on high resolution, low distortion and imaging definition of a lens are carried out, such as a 35mm focal length high-definition low-distortion industrial lens with a large target surface of CN109116518A1.1 inches and a focusing method thereof, a 35mm fixed focus industrial lens with a CN209055738U, a CN106501923A high-resolution industrial camera lens and the like, which all utilize optical structures with different combinations to improve the resolution, distortion and imaging definition of the lens, solve the problem of poor imaging quality caused by low resolution, high distortion and poor imaging definition, but the problem of large volume and high cost of the lens with the existing optical structure generally exists, so that the lens is difficult to be widely used, has poor matching property, and inhibits the development of the industrial lens. For this reason, a new solution is needed to solve the above technical problems.
Disclosure of Invention
The utility model aims to provide an optical imaging structure with full-frame fixed focus and a 35mm industrial lens, so as to solve the problems of large volume, high cost, low utilization rate and poor matching of the lens with the optical structure at the present stage in the background art, and greatly inhibit the development of the industrial lens.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an optical imaging structure of full-frame fixed focus, includes and has set gradually front group, diaphragm and the back group that focal power is positive for negative along light incidence direction from left to right, front group is equipped with positive meniscus lens A, positive meniscus lens B, negative meniscus lens A and negative meniscus lens B from left to right in proper order, positive meniscus lens B and negative meniscus lens A joint close are first veneer group, back group is equipped with negative meniscus lens C and biconvex positive meniscus lens from left to right in proper order, negative meniscus lens C and biconvex positive meniscus lens joint close are second veneer group, positive meniscus lens A sets up to glass aspheric surface, positive meniscus lens B, negative meniscus lens A, negative meniscus lens B, negative meniscus lens C and biconvex positive meniscus lens all set up to glass spherical surface.
Further, the air interval between the front side surface of the first gluing group and the rear side surface of the positive meniscus lens A is 0.19907-0.20107 mm, the air interval between the rear side surface of the first gluing group and the front side surface of the negative meniscus lens B is 1.1782-1.1802 mm, the air interval between the rear side surface of the negative meniscus lens B and the front side surface of the diaphragm is 8.37128-8.37328 mm, and the air interval between the rear side surface of the diaphragm and the front side surface of the second gluing group is 1.38733-1.38933 mm.
Further, the radius of curvature of the front side of the positive meniscus lens a is 42.85100mm, the radius of curvature of the rear side of the positive meniscus lens a is infinite, the radius of curvature of the front side of the first glue group is 32.77200mm, the radius of curvature of the rear side of the first glue group is 83.82100mm, the radius of curvature of the glue side of the first glue group is 377.63900mm, the radius of curvature of the front side of the negative meniscus lens B is 289.92300mm, the radius of curvature of the rear side of the negative meniscus lens B is 20.27400mm, the radius of curvature of the front side of the second glue group is-200.416 mm, the radius of curvature of the rear side of the second glue group is-95.03200 mm, and the radius of curvature of the glue side of the second glue group is 27.446mm.
Further, the rear side of the second glue group is set as an image plane, and the front side of the positive meniscus lens a is set as an object plane.
In addition to the above technical scheme, there is a 35mm industrial lens with the full-frame fixed-focus optical imaging structure.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model utilizes the characteristics of high relative caliber ratio and large angle of view of the glass aspheric surface to effectively improve the light beam quality of the optical imaging structure, thereby ensuring the imaging quality and effect of the lens, effectively simplifying the layout and structure of the optical imaging structure, realizing the purpose of miniaturization of the lens, greatly improving the use amount and matching performance of the lens while reducing the volume and cost, and enabling the lens to be a trend of miniaturized development of industrial lenses and have popularization effect;
2. according to the utility model, the positive meniscus lens A of the glass aspheric surface is arranged behind the object plane, so that the optical imaging structure has a large angle of view, and the problems of distortion correction, vertical axis chromatic aberration and field curvature control can be solved under the condition of large field of view, and the imaging quality and effect of the lens are ensured;
3. the utility model adopts the arrangement of five glass spheres (namely positive meniscus lens B, negative meniscus lens A, negative meniscus lens B, negative meniscus lens C and biconvex positive meniscus lens) and one glass aspheric surface (namely positive meniscus lens A), so that the layout and structure of an optical imaging structure are effectively simplified, the purpose of miniaturization of the lens is realized, the lens can be widely used while the volume and cost are reduced, the use amount and the matching property of the lens are greatly improved, the lens also becomes the trend of miniaturization development of industrial lenses, and the popularization effect is realized;
4. the utility model adopts the matching arrangement of the front group, the diaphragm and the rear group, so that the MTF (modulation transfer function) of the lens is compact to be higher than 0.63, the relative illuminance is higher than 55 percent, and the utility model has very high resolution, thereby achieving the effects of excellent tolerance performance and high yield and ensuring the imaging quality of the lens.
Drawings
FIG. 1 is a schematic illustration of an optical imaging structure of the present utility model;
FIG. 2 is a graph of MTF for a lens of the present utility model;
FIG. 3 is a defocus MTF plot of a lens of the present utility model;
FIG. 4 is a graph of field curvature and distortion of a lens barrel of the present utility model;
FIG. 5 is a graph of the vertical axis chromatic aberration of a lens of the present utility model;
fig. 6 is a schematic view of the appearance structure of the lens barrel of the present utility model.
Wherein: 1. a front group; 101. a positive meniscus lens a; 102. a positive meniscus lens B; 103. a negative meniscus lens a; 1023. a first glue group; 104. a negative meniscus lens B; 2. a diaphragm; 3. a rear group; 301. a negative meniscus lens C; 302. biconvex positive meniscus lens; 3012. and a second glue group.
Detailed Description
The following examples are intended to further illustrate the utility model and are not intended to limit the application of the utility model.
Example 1:
referring to fig. 1, an optical imaging structure with full frame fixed focus includes a front group 1 with negative focal power, a diaphragm 2, and a rear group 3 with positive focal power sequentially arranged from left to right along a light incidence direction, wherein the front group 1 is sequentially provided with a positive meniscus lens a101, a positive meniscus lens B102, a negative meniscus lens a103, and a negative meniscus lens B104 from left to right, the positive meniscus lens B102 is closely connected with the positive meniscus lens a103 to form a first bonding group 1023, the rear group 3 is sequentially provided with a negative meniscus lens C301 and a biconvex positive meniscus lens 302 from left to right, the negative meniscus lens C301 and the biconvex positive meniscus lens 302 are closely connected with a second bonding group 3012, the positive meniscus lens a101 is provided with a glass aspheric surface, the positive meniscus lens B102, the negative meniscus lens a103, the negative meniscus lens B104, the negative meniscus lens C301, and the biconvex positive meniscus lens 302 are all provided with a glass spherical surface, the rear side of the second bonding group 3012 is provided with an image surface, and the front side of the positive meniscus lens a101 is provided with an object surface;
the air interval between the front side of the first glue group 1023 and the rear side of the positive meniscus lens A101 is 0.19907-0.20107 mm, the radius of curvature of the front side of the positive meniscus lens A101 is 42.85100mm, and the radius of curvature of the rear side of the positive meniscus lens A101 is infinite;
the air interval between the rear side of the first glue group 1023 and the front side of the negative meniscus lens B104 is 1.1782-1.1802 mm, the radius of curvature of the front side of the negative meniscus lens B104 is 289.92300mm, and the radius of curvature of the rear side of the negative meniscus lens B104 is 20.27400mm;
the radius of curvature of the front side of the first glue group 1023 is 32.77200mm, the radius of curvature of the rear side of the first glue group 1023 is 83.82100mm, and the radius of curvature of the glue surface of the first glue group 1023 is 377.63900mm;
the air interval between the rear side of the negative meniscus lens B104 and the front side of the diaphragm 2 is 8.37128-8.37328, the air interval between the rear side of the diaphragm 2 and the front side of the second gluing group 3012 is 1.38733-1.38933 mm, the curvature radius of the front side of the second gluing group 3012 is-200.416 mm, the curvature radius of the rear side of the second gluing group 3012 is-95.03200 mm, and the curvature radius of the gluing surface of the second gluing group 3012 is 27.446mm.
The parameter data of the specific mirror surface of the optical imaging structure are as follows:
note that: the thickness of the back side of the positive meniscus lens A, the back side of the first gluing group, the back side of the negative meniscus lens B and the diaphragm or the numerical values in the interval columns are all air intervals;
the optical imaging structure composed of the mirror surfaces can effectively improve the light beam quality under the characteristic of the aspheric surface of the glass, effectively simplify the layout and structure of the optical imaging structure and realize the purpose of miniaturization of the lens.
Example 2:
referring to fig. 6, as another object of the present utility model, there is provided a 35mm industrial lens, in which the above optical imaging structure is provided, and according to the technical parameters of each mirror surface of the optical imaging structure, the technical indexes of the lens can be achieved as follows:
the optical transfer function curve of the lens is shown in fig. 2, in which the abscissa represents the spatial frequency in lp/mm and the ordinate represents the optical transfer function value, i.e. the MTF value, and as can be seen in fig. 2, when the MTF value at 15lp/mm reaches 0.65, it is indicated that the resolution of the lens is high.
As shown in fig. 3, the defocus curve of the optical transfer function of the lens, in which the abscissa indicates that the defocus amount ranges from-1 mm to +1mm, and the ordinate indicates that the optical transfer function value, i.e., the MTF value, as can be seen from fig. 3, is large, the imaging range in the optical axis direction of the lens is larger.
As shown in fig. 4, the field curvature and distortion curve of the lens are shown in the left half curve, wherein the abscissa represents the magnitude of the field curvature, the unit is mm, and the ordinate represents the normalized field radius, and as can be seen in the left half diagram of fig. 4, the field curvature curve in the effective field range has a smaller degree, which indicates that the imaging quality of the lens is relatively uniform; the right half is a distortion curve, wherein the abscissa represents a distortion value, and the ordinate represents a normalized field radius, and as can be seen from the right half of fig. 4, the maximum distortion is 2%, and the distortion is small, which indicates that the imaging deformation degree of the lens is small.
As shown in FIG. 5, the vertical axis chromatic aberration curve of the lens is shown in the graph, wherein the horizontal axis represents the vertical axis chromatic aberration, the unit is um, and the vertical axis represents the normalized field radius, and as can be seen in FIG. 5, the maximum value of the vertical axis chromatic aberration is 2.1um, which indicates that the vertical axis chromatic aberration of the lens is smaller, so that the quality of the light beam of the optical imaging structure is improved, the imaging quality and the effect are improved, the purpose of miniaturization of the lens is realized, the lens can be widely used while the volume and the cost are reduced, the use amount and the matching property of the lens are greatly improved, and the lens can be a trend of miniaturized development of an industrial lens, and has the popularization effect.
The lens equipped with the optical imaging structure has the advantages that:
(1) Five glass spherical lenses and one glass aspheric lens are selected for the lens provided with the optical imaging structure, and the light beam quality of the optical imaging structure is improved by utilizing the characteristics of the glass aspheric lens, so that the imaging quality and the imaging effect of the lens are ensured;
(2) The lens provided with the optical imaging structure can reduce the volume and the cost of the lens while simplifying the layout and the structure of the optical imaging structure;
(3) The lens with the optical imaging structure can be widely used while reducing the volume and cost, greatly improves the use amount and matching performance of the lens, and also enables the lens to be a trend of industrial lens miniaturization development, and has popularization effect;
(4) The MTF (modulation transfer function) of the lens assembled with the optical imaging structure is compact to form a beam which is higher than 0.63, the relative illuminance is higher than 55%, and the lens has very high resolution, so that the effects of excellent tolerance performance and high yield are achieved, and the imaging quality of the lens is ensured.
Claims (10)
1. The utility model provides an optical imaging structure of full-frame fixed focus, includes that along light incidence direction has set gradually front group, diaphragm and the back group that focal power is positive for negative from left to right, its characterized in that, front group is equipped with positive meniscus lens A, positive meniscus lens B, negative meniscus lens A and negative meniscus lens B in proper order from left to right, back group is equipped with negative meniscus lens C and biconvex positive meniscus lens from left to right in proper order, positive meniscus lens A sets up to glass aspheric surface, positive meniscus lens B, negative meniscus lens A, negative meniscus lens C and biconvex positive meniscus lens all set up to glass spherical surface.
2. The full-frame fixed focus optical imaging structure of claim 1, wherein the positive meniscus lens B is closely connected with the negative meniscus lens a to form a first bonding group, and the negative meniscus lens C is closely connected with the biconvex positive meniscus lens to form a second bonding group.
3. The full frame fixed focus optical imaging arrangement of claim 2, wherein an air space between the front side of the first glue group and the back side of the positive meniscus lens a is 0.19907-0.20107 mm, and an air space between the back side of the first glue group and the front side of the negative meniscus lens B is 1.1782-1.1802 mm.
4. A full frame fixed focus optical imaging arrangement according to claim 3, wherein the air space between the back side of the negative meniscus lens B and the front side of the diaphragm is 8.37128-8.37328 mm, and the air space between the back side of the diaphragm and the front side of the second glue group is 1.38733-1.38933 mm.
5. A full frame fixed focus optical imaging architecture as claimed in claim 3, wherein the front side radius of curvature of the positive meniscus lens a is 42.85100mm and the back side radius of curvature of the positive meniscus lens a is infinite.
6. A full frame fixed focus optical imaging arrangement according to claim 3, wherein the radius of curvature of the front side of the first glue group is 32.77200mm, the radius of curvature of the back side of the first glue group is 83.82100mm, and the radius of curvature of the glue side of the first glue group is 377.63900mm.
7. A full frame fixed focus optical imaging architecture as claimed in claim 3, wherein the radius of curvature of the front side of the negative meniscus lens B is 289.92300mm and the radius of curvature of the back side of the negative meniscus lens B is 20.27400mm.
8. The full frame fixed focus optical imaging architecture of claim 2, wherein a radius of curvature of a front side of the second glue group is-200.416 mm, a radius of curvature of a back side of the second glue group is-95.03200 mm, and a radius of curvature of a glue side of the second glue group is 27.446mm.
9. The full frame fixed focus optical imaging architecture of claim 8, wherein a rear side of the second glue set is configured as an image plane, and a front side of the positive meniscus lens a is configured as an object plane.
10. A 35mm industrial lens comprising an optical imaging structure of full frame fixed focus as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320431347.6U CN219695546U (en) | 2023-03-09 | 2023-03-09 | Full-frame fixed-focus optical imaging structure and 35mm industrial lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320431347.6U CN219695546U (en) | 2023-03-09 | 2023-03-09 | Full-frame fixed-focus optical imaging structure and 35mm industrial lens |
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| Publication Number | Publication Date |
|---|---|
| CN219695546U true CN219695546U (en) | 2023-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320431347.6U Active CN219695546U (en) | 2023-03-09 | 2023-03-09 | Full-frame fixed-focus optical imaging structure and 35mm industrial lens |
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| CN (1) | CN219695546U (en) |
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- 2023-03-09 CN CN202320431347.6U patent/CN219695546U/en active Active
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