CN117930473A - Wide focal depth platemaking optical lens - Google Patents
Wide focal depth platemaking optical lens Download PDFInfo
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- CN117930473A CN117930473A CN202410340357.8A CN202410340357A CN117930473A CN 117930473 A CN117930473 A CN 117930473A CN 202410340357 A CN202410340357 A CN 202410340357A CN 117930473 A CN117930473 A CN 117930473A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 38
- 239000011521 glass Substances 0.000 claims description 7
- 210000001747 pupil Anatomy 0.000 claims description 3
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- 238000009826 distribution Methods 0.000 abstract description 2
- 238000003384 imaging method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
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- 230000035945 sensitivity Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
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Abstract
The invention discloses a wide-focal-depth platemaking optical lens, which sequentially comprises a first lens with positive focal power, wherein the first lens is a plane on an object side and a convex on an image side from an object side to an image side. The object side is the convex surface, the image side is the second lens with positive focal power of plane, the object side is the concave surface, the image side is the concave surface has the third lens with negative focal power, the image side is the convex surface has the fourth lens with positive focal power, the object side is the convex surface, the fifth lens, the sixth lens and the object side is the convex surface, the image side is the concave surface has the seventh lens with positive focal power, at least one of the fifth lens and the sixth lens has positive focal power, the focal length f of the optical lens satisfies: the optical total length TTL is more than 48mm and less than 58mm, and is more than 138mm and less than 146mm, and the advantages are that the effects of high resolution, wide focal depth and low distortion are realized by the selection of lens surfaces and the reasonable distribution of optical power, and the use requirements are met.
Description
Technical Field
The present invention relates to an optical lens, and more particularly, to a wide focal depth plate-making optical lens.
Background
The existing computer-to-plate (Computer to plate, CTP for short) technology is an efficient and environment-friendly pre-printing technology, and characters and patterns are directly exposed on a printing master plate through laser, so that steps such as film development and the like are omitted, emission of chemical substances is reduced, and development of the printing industry is greatly promoted. In CTP devices, the plate making lens transmits laser energy to the plate, so the imaging accuracy of the plate making lens and the cooperation with the plate determine the quality of the plate.
The plate making lenses currently on the market have the following general conditions:
1) In plate making equipment, a plate is fixed on a roller by a pressing bar, and a plate making lens is fixed on a movable guide rail. The roller drives the plate to rotate, and the guide rail drives the plate making lens to transversely move, so that image projection and plate making operation are completed. The factors of flatness and matching degree exist between mechanical structures such as rollers, pressing strips and guide rails and the like and the plates, so that a tolerance zone is generated, matching of a plate making lens and the plates is affected, and focal depth of the lens is tested. The plate making lens of patent publication No. CN218547111U achieves the effects of high resolution and low distortion by six separate glass lenses, but does not consider the practical range of depth of focus.
2) When the plate-making optical lens works, laser needs to be converged for a long time, and the temperature of a place with high beam energy is also high. In order to avoid ageing, deteriorating and cracking of the glue and at the same time avoid that the glue gasifies to influence the appearance of the lens, a plurality of separate lenses or aspherical glass lenses are usually used instead of a double or triple cemented lens. However, the cost is correspondingly increased after the number of lenses is increased, and the assembly difficulty is correspondingly increased. The projection lens disclosed in the chinese patent application publication No. CN114660775A realizes the projection effect of high resolution and low distortion by nine separate glass lenses, but the number of lenses is relatively large.
3) The accuracy of the plate depends on the imaging resolution of the plate making lens, and the imaging resolution is difficult to be maximized under the premise of controlling the number and cost of the lenses. The plate-making optical system with the patent publication number of CN111175951A realizes the effects of continuously adjustable resolution and low distortion through seven-piece lens, but has lower resolution and does not meet the high-precision requirement of part of plate-making machines.
Disclosure of Invention
The present invention is directed to a wide focal depth lens for plate making, which at least partially or at least partially overcomes at least one of the above-mentioned drawbacks of the prior art.
The technical scheme adopted for solving the technical problems is as follows: the wide-focal-depth platemaking optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from an object side to an image side, wherein the first lens has positive focal power, the object side is a plane, and the image side is a convex surface; the second lens has positive focal power, the object side surface is a convex surface, and the image side surface is a plane; the third lens has negative focal power, the object side surface is a concave surface, and the image side surface is a concave surface; the fourth lens has positive focal power, and the image side surface is a convex surface; the object side surface of the fifth lens is a convex surface; the seventh lens has positive focal power, the object side surface is a convex surface, the image side surface is a concave surface, at least one of the fifth lens and the sixth lens has positive focal power, and the focal length f of the optical lens meets the following conditions: the total optical length TTL is more than 48mm and less than 58mm, and is more than 138mm and less than 146mm.
Compared with the prior art, the invention has the advantages that seven separated spherical glass lenses are used, the use stability is improved, and the manufacturing cost is controlled; through the selection of lens face formula and the reasonable distribution of focal power, realize high resolution, wide depth of focus and low distortion's effect, satisfy the user demand.
Preferably, the focal length of the whole optical lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are f1, f2, f3, f4, f5, f6 and f7 respectively, so as to satisfy the following conditions ：1.6＜|f1/f|＜1.9,0.7＜|f2/f|＜1.7,0.3＜|f3/f|＜0.4,0.7＜|f4/f|＜1.0,0.7＜|f5/f|＜1.4,0.7＜|f6/f|＜1.3,1.0＜|f7/f|＜4.0.
Preferably, the object numerical aperture NA satisfies: na=0.07, entrance pupil diameter ENPD satisfies: 35mm < ENPD mm < 47mm.
Preferably, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all spherical lenses.
Preferably, the materials of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are glass.
Preferably, the first lens has an abbe number VD1, the second lens has an abbe number VD2, the third lens has an abbe number VD3, the fourth lens has an abbe number VD4, the fifth lens has an abbe number VD5, the sixth lens has an abbe number VD6, and the seventh lens has an abbe number VD7, and the relationship is as follows: 50 < VD1 < 80, 15 < VD2 < 65, 15 < VD3 < 50, 50 < VD4 < 80, 30 < VD5 < 70, 15 < VD6 < 100, 15 < VD7 < 65.
Drawings
FIG. 1 is a schematic diagram of an optical system of example 1in an embodiment of the invention;
FIG. 2 is a graph of transfer functions of example 1in an embodiment of the invention;
FIG. 3 is a plot of the defocus transfer function at 70 line pairs for example 1 in an embodiment of the present invention;
FIG. 4 is a distortion chart of example 1 in an embodiment of the present invention;
FIG. 5 is a schematic diagram of an optical system according to example 2 of an embodiment of the present invention;
FIG. 6 is a graph of transfer functions for example 2 of the present invention;
FIG. 7 is a plot of the defocus transfer function at 70 line pairs for example 2 in an embodiment of the present invention;
FIG. 8 is a distortion chart of example 2 in an embodiment of the present invention;
FIG. 9 is a schematic diagram of an optical system of example 3 in an embodiment of the invention;
FIG. 10 is a graph of transfer function for example 3 in an embodiment of the invention;
FIG. 11 is a plot of the defocus transfer function at 70 line pairs for example 3 in an embodiment of the present invention;
FIG. 12 is a distortion chart of example 3 in an embodiment of the present invention;
FIG. 13 is a schematic diagram of an optical system of example 4 in an embodiment of the invention;
FIG. 14 is a graph of transfer function for example 4 in an embodiment of the invention;
FIG. 15 is a plot of the defocus transfer function at 70 line pairs for example 4 in an embodiment of the present invention;
Fig. 16 is a distortion chart of example 4 in an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the accompanying drawings, which are for reference and illustration only, and do not limit the scope of the invention.
Examples
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. The figures are merely examples and are not drawn to scale.
In an exemplary mode, the separation type lens is selected, so that the phenomena of aging, deterioration, cracking, gasification and the like of glue in the glued lens in long-time laser can be avoided, and the stability of the lens in use is improved.
A wide focal depth plate making lens, wherein the lens with optical power is provided with seven lenses, which are arranged from an object side to an image side in sequence: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 all have positive focal power, and the first lens L1 and the second lens L2 sequentially collect light, so that the light propagation process is gentle, and the sensitivity of the lens is reduced; the third lens L3 has negative focal power, expands the divergence angle of the light beam, and allows the light beam to be shaped by the following lens; the fourth lens L4 has positive focal power, the curvature radius of the object side surface is larger, the turning to light is smaller, and the sensitivity degree of the lens is reduced; at least one of the fifth lens L5 and the sixth lens L6 has negative focal power, controls the light beam converging speed, reduces the spherical aberration and controls the back focus; the seventh lens L7 has positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the diaphragm STO is positioned between the third lens L3 and the fourth lens L4, the trend of the light beam is controlled, the light beam diverges and converges before the diaphragm STO, diverges and converges again after the diaphragm STO, and the field curvature is controlled.
The focal length of the lens is f, and the focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are respectively f1, f2, f3, f4, f5, f6 and f7, thereby meeting the following requirements ：1.6＜|f1/f|＜1.9,0.7＜|f2/f|＜1.7,0.3＜|f3/f|＜0.4,0.7＜|f4/f|＜1.0,0.7＜|f5/f|＜1.4,0.7＜|f6/f|＜1.3,1.0＜|f7/f|＜4.0.
The focal length f of the entire optical lens satisfies: 48mm < f < 58mm, and the numerical aperture NA of the object space satisfies the following conditions: na=0.07, entrance pupil diameter ENPD satisfies: 35mm < ENPD < 47mm, and the total optical length TTL is 138mm < TTL < 146mm.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all spherical lenses.
The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all glass.
The relationship that the first lens L1 has an abbe number VD1, the second lens L2 has an abbe number VD2, the third lens L3 has an abbe number VD3, the fourth lens L4 has an abbe number VD4, the fifth lens L5 has an abbe number VD5, the sixth lens L6 has an abbe number VD6, and the seventh lens L7 has an abbe number VD7 is satisfied: 50 < VD1 < 80, 15 < VD2 < 65, 15 < VD3 < 50, 50 < VD4 < 80, 30 < VD5 < 70, 15 < VD6 < 100, 15 < VD7 < 65.
The technical scheme and the technical effects achieved by the invention are better described below by four examples with reference to the accompanying drawings.
Example one:
the structure of the first example is shown in fig. 1.
A wide focal depth plate making lens from the object side to the image side comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7,
The focal power of the first lens L1 is positive, the object side surface is a plane, and the image side surface is a convex surface;
the focal power of the second lens L2 is positive, the object side surface is a convex surface, and the image side surface is a plane;
the focal power of the third lens L3 is negative, the object side surface is a concave surface, and the image side surface is a concave surface;
the focal power of the fourth lens L4 is positive, the object side surface is concave, and the image side surface is convex;
the focal power of the fifth lens element L5 is positive, the object-side surface is convex, and the image-side surface is convex;
the focal power of the sixth lens element L6 is negative, the object-side surface is concave, and the image-side surface is convex;
the seventh lens L7 has positive optical power, a convex object-side surface and a concave image-side surface.
The physical optical parameters of the first example are shown in table 1:
TABLE 1
In the first example, the transfer function curve of the lens is shown in fig. 2, the defocus transfer function curve at 70 line pairs is shown in fig. 3, and the distortion is shown in fig. 4.
The transfer function graph shown in fig. 2 shows that the transfer function values of the center field of view (0.0000 mm meridian and 0.0000mm sagittal coincidence) and the edge field of view (3.5000 mm meridian and 3.5mm sagittal misalignment) are both greater than 0.6 in the 300lp/mm range for this example, with higher resolution.
The defocus transfer function graph shown in fig. 3 shows that the focal depth range of the center field of view (0.0000 mm meridian and 0.0000mm sagittal coincidence) and the edge field of view (3.5000 mm meridian and 3.5mm sagittal misalignment) is greater than 0.044mm with a larger focal depth range, leaving sufficient margin for the lens to plate fit, for the example at 70 line pairs with transfer function values greater than 0.4.
The distortion map shown in fig. 4 shows that the maximum distortion of the first example is 0.009%, and has high imaging accuracy.
Example two:
The structure of the second example is shown in fig. 5.
A wide focal depth plate making lens from the object side to the image side comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7,
The focal power of the first lens L1 is positive, the object side surface is a plane, and the image side surface is a convex surface;
the focal power of the second lens L2 is positive, the object side surface is a convex surface, and the image side surface is a plane;
the focal power of the third lens L3 is negative, the object side surface is a concave surface, and the image side surface is a concave surface;
the focal power of the fourth lens L4 is positive, the object side surface is concave, and the image side surface is convex;
the focal power of the fifth lens element L5 is positive, the object-side surface is convex, and the image-side surface is convex;
the focal power of the sixth lens element L6 is negative, the object-side surface is concave, and the image-side surface is convex;
the seventh lens L7 has positive optical power, a convex object-side surface and a concave image-side surface.
The physical optical parameters of the second example are shown in table 2:
TABLE 2
In the second example, the transfer function curve of the lens is shown in fig. 6, the defocus transfer function curve at 70 line pairs is shown in fig. 7, and the distortion is shown in fig. 8.
The transfer function graph shown in fig. 6 shows that the transfer function values of the center field of view (0.0000 mm meridian and 0.0000mm sagittal coincidence) and the edge field of view (3.5000 mm meridian and 3.5mm sagittal misalignment) are both greater than 0.6 in the 300lp/mm range for this example, with higher resolution.
The defocus transfer function graph shown in fig. 7 shows that the focal depth range of the center field of view (0.0000 mm meridian and 0.0000mm sagittal coincidence) and the edge field of view (3.5000 mm meridian and 3.5mm sagittal misalignment) is greater than 0.044mm with a larger focal depth range, leaving sufficient margin for the lens to plate fit, for the present example two, at 70 line pairs, with transfer function values greater than 0.4.
The distortion chart shown in fig. 8 shows that the maximum distortion of the second example is 0.0309%, and the imaging accuracy is high.
Example two the surface curvature radii of the third lens L3, the fifth lens L5, and the sixth lens L6 were changed compared to example one, so that the transfer function values of the lens center field of view (0.0000 mm meridian, 0.0000mm sagittal) and the edge field of view (3.5000 mm meridian, 3.5000mm sagittal) were more concentrated, as shown in fig. 2 and 6.
Example three:
The structure of the third example is shown in fig. 9.
A wide focal depth plate making lens from the object side to the image side comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7,
The focal power of the first lens L1 is positive, the object side surface is a plane, and the image side surface is a convex surface;
the focal power of the second lens L2 is positive, the object side surface is a convex surface, and the image side surface is a plane;
the focal power of the third lens L3 is negative, the object side surface is a concave surface, and the image side surface is a concave surface;
the focal power of the fourth lens L4 is positive, the object side surface is concave, and the image side surface is convex;
The focal power of the fifth lens element L5 is negative, the object-side surface is convex, and the image-side surface is concave;
the focal power of the sixth lens element L6 is positive, the object-side surface is convex, and the image-side surface is convex;
the seventh lens L7 has positive optical power, a convex object-side surface and a concave image-side surface.
The physical optical parameters of this example three are shown in table 3:
TABLE 3 Table 3
In the third example, the transfer function curve of the lens is shown in fig. 10, the defocus transfer function curve at 70 line pairs is shown in fig. 11, and the distortion is shown in fig. 12.
The transfer function graph shown in fig. 10 shows that the transfer function values of the present example 3 are both greater than 0.6 for the center field of view (0.0000 mm meridian and 0.0000mm sagittal coincidence) and the edge field of view (3.5000 mm meridian and 3.5mm sagittal misalignment) in the 300lp/mm range, with higher resolution.
The defocus transfer function graph shown in fig. 11 shows that the focal depth range of the center field of view (0.0000 mm meridian and 0.0000mm sagittal coincidence) and the edge field of view (3.5000 mm meridian and 3.5mm sagittal misalignment) is greater than 0.044mm with a larger focal depth range, leaving sufficient margin for the lens to plate fit, for the example three at 70 line pairs, with transfer function values greater than 0.4.
The distortion chart shown in fig. 12 shows that the maximum distortion of the third example is 0.0288%, and has high imaging accuracy.
Example three the surface type and material of the third lens L3, the fifth lens L5, and the sixth lens L6 were changed compared to those of examples one and two, so that the transfer function values of the lens center field of view (0.0000 mm meridian, 0.0000mm sagittal) and the edge field of view (3.5000 mm meridian, 3.5000mm sagittal) were higher and more concentrated, as shown in fig. 2, 6, and 10.
Example four:
The structure of the fourth example is shown in fig. 13.
A wide focal depth plate making lens from the object side to the image side comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7,
The focal power of the first lens L1 is positive, the object side surface is a plane, and the image side surface is a convex surface;
the focal power of the second lens L2 is positive, the object side surface is a convex surface, and the image side surface is a plane;
the focal power of the third lens L3 is negative, the object side surface is a concave surface, and the image side surface is a concave surface;
the focal power of the fourth lens L4 is positive, the object side surface is a plane, and the image side surface is a convex surface;
the focal power of the fifth lens element L5 is positive, the object-side surface is convex, and the image-side surface is convex;
the focal power of the sixth lens L6 is negative, the object side surface is a concave surface, and the image side surface is a concave surface;
the seventh lens L7 has positive optical power, a convex object-side surface and a concave image-side surface.
The physical optical parameters of the fourth example are shown in table 4:
TABLE 4 Table 4
In the fourth example, the transfer function graph of the lens is shown in fig. 14, the defocus transfer function graph at 70 line pairs is shown in fig. 15, and the distortion is shown in fig. 16.
The transfer function graph shown in fig. 14 shows that the transfer function values of the center field of view (0.0000 mm meridian and 0.0000mm sagittal coincidence) and the edge field of view (3.5000 mm meridian and 3.5mm sagittal misalignment) are both greater than 0.6 in the 300lp/mm range for this example, with higher resolution.
The defocus transfer function graph shown in fig. 15 shows that the focal depth range of the center field of view (0.0000 mm meridian and 0.0000mm sagittal coincidence) and the edge field of view (3.5000 mm meridian and 3.5mm sagittal misalignment) is greater than 0.045mm with a larger focal depth range, leaving sufficient margin for the lens to plate fit, for the present example four at 70 line pairs, with transfer function values greater than 0.4.
The distortion chart shown in fig. 16 shows that the maximum distortion of the fourth example is 0.0137%, and has high imaging accuracy.
Example four the lens surface type and materials other than the first lens L1 were changed compared to the above three examples, so that the transfer function values of the lens center field of view (0.0000 mm meridian, 0.0000mm sagittal) and the edge field of view (3.5000 mm meridian, 3.5000mm sagittal) were higher, more concentrated, and the focal depth range was larger, as shown in fig. 2,6, 10, 14, and 15.
The main design parameters for the above examples are shown in table 5:
Table 5:
the foregoing is merely illustrative of the present invention and is not intended to limit the scope of the claims, and equivalent variations on the claims of the present invention are therefore within the scope of the invention.
Claims (6)
1. The wide-focal-depth platemaking optical lens is characterized in that the first lens has positive focal power, the object side surface is a plane, and the image side surface is a convex surface; the second lens has positive focal power, the object side surface is a convex surface, and the image side surface is a plane; the third lens has negative focal power, the object side surface is a concave surface, and the image side surface is a concave surface; the fourth lens has positive focal power, and the image side surface is a convex surface; the object side surface of the fifth lens is a convex surface; the seventh lens has positive focal power, the object side surface is a convex surface, the image side surface is a concave surface, at least one of the fifth lens and the sixth lens has positive focal power, and the focal length f of the optical lens meets the following conditions: the total optical length TTL is more than 48mm and less than 58mm, and is more than 138mm and less than 146mm.
2. The wide-focal-depth plate-making optical lens of claim 1, wherein the focal length of the entire optical lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are f1, f2, f3, f4, f5, f6 and f7, respectively, satisfying the following conditions ：1.6＜|f1/f|＜1.9,0.7＜|f2/f|＜1.7,0.3＜|f3/f|＜0.4,0.7＜|f4/f|＜1.0,0.7＜|f5/f|＜1.4,0.7＜|f6/f|＜1.3,1.0＜|f7/f|＜4.0.
3. A wide depth of focus plate making optical lens according to claim 1, wherein said object space numerical aperture NA satisfies: na=0.07, entrance pupil diameter ENPD satisfies: 35mm < ENPD mm < 47mm.
4. The wide-depth-of-focus plate optical lens of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are spherical lenses.
5. The wide-depth-of-focus plate optical lens of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all made of glass.
6. The wide-depth-of-focus plate-making optical lens according to claim 1, wherein the first lens has an abbe number VD1, the second lens has an abbe number VD2, the third lens has an abbe number VD3, the fourth lens has an abbe number VD4, the fifth lens has an abbe number VD5, the sixth lens has an abbe number VD6, and the seventh lens has an abbe number VD7, the relationship being that: 50 < VD1 < 80, 15 < VD2 < 65, 15 < VD3 < 50, 50 < VD4 < 80, 30 < VD5 < 70, 15 < VD6 < 100, 15 < VD7 < 65.
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| CN108089291A (en) * | 2017-12-04 | 2018-05-29 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| US20220011540A1 (en) * | 2020-07-09 | 2022-01-13 | Aac Optics (Changzhou) Co., Ltd. | Camera optical lens |
| CN112198636A (en) * | 2020-11-16 | 2021-01-08 | 辽宁中蓝光电科技有限公司 | Lens of 5 lens of wide angle degree high resolution |
| US20230063258A1 (en) * | 2021-08-17 | 2023-03-02 | Jiangxi Jingchao Optical Co., Ltd. | Optical system, image acquisition module and electronic device |
| CN114153064A (en) * | 2021-12-31 | 2022-03-08 | 湖南长步道光学科技有限公司 | Integrated microscopic optical system and microscope |
| CN117434694A (en) * | 2023-12-04 | 2024-01-23 | 河南百合特种光学研究院有限公司 | Projection objective working in wide temperature range |
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