CN111158121A - Optical imaging lens - Google Patents
Optical imaging lens Download PDFInfo
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- CN111158121A CN111158121A CN202010160726.7A CN202010160726A CN111158121A CN 111158121 A CN111158121 A CN 111158121A CN 202010160726 A CN202010160726 A CN 202010160726A CN 111158121 A CN111158121 A CN 111158121A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 53
- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 238000003384 imaging method Methods 0.000 claims description 19
- 239000006185 dispersion Substances 0.000 claims description 8
- 239000005331 crown glasses (windows) Substances 0.000 claims description 7
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 4
- 239000005308 flint glass Substances 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 230000004075 alteration Effects 0.000 abstract description 27
- 238000005286 illumination Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 24
- 238000012546 transfer Methods 0.000 description 9
- 239000011521 glass Substances 0.000 description 6
- 230000014509 gene expression Effects 0.000 description 4
- 239000000571 coke Substances 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to the technical field of lenses. The invention discloses an optical imaging lens, which sequentially comprises a first lens, a third lens, a diaphragm, a fourth lens, a sixth lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, wherein the first lens and the second lens are convex-concave lenses with positive refractive indexes; the fourth lens and the fifth lens are mutually glued. The invention has the advantages of high resolution, small chromatic aberration, small distortion, large light transmission, high relative illumination, large image surface, high and low temperature and non-volatile focus.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to an optical imaging lens for machine vision.
Background
With the continuous progress of science and technology and the continuous development of society, in recent years, optical imaging lenses are also rapidly developed and widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring, machine vision and the like, so that the requirements on the optical imaging lenses are higher and higher.
In a machine vision system, the performance of an optical imaging lens is critical, and the feasibility and reliability of the whole system are affected. However, the low-light characteristic of the optical imaging lens applied to the 50mm focal length section of the machine vision system is not good at present, and a clear color image cannot be realized under the condition of poor light; the distortion is large, the image is easy to deform, and the identification is inaccurate; the transfer function is not well controlled, the resolution is low, and the imaging quality is poor; the edge color difference is large, and the color reduction degree is poor; when the coke is used in high and low temperature environments, the coke loss is serious; the image plane is small, and the increasing requirements of a machine vision system cannot be met, so that the improvement is urgently needed.
Disclosure of Invention
The present invention is directed to an optical imaging lens to solve the above problems.
In order to achieve the purpose, the invention adopts the technical scheme that: an optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens and a sixth lens from an object side to an image side along an optical axis; the first lens element to the sixth lens element respectively comprise an object side surface facing the object side and allowing the imaging light to pass and an image side surface facing the image side and allowing the imaging light to pass;
the first lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface;
the fourth lens and the fifth lens are mutually glued; the optical imaging lens has only the six lenses with the refractive indexes.
Further, the second lens and the third lens are cemented with each other.
Furthermore, the optical imaging lens further satisfies the following conditions: vd2>55, wherein vd2 is the abbe number of the second lens, and the temperature coefficient of refraction dn/dt of the second lens is negative.
Furthermore, the second lens is made of fluorine crown glass or heavy phosphorus crown glass.
Furthermore, the third lens is made of heavy flint glass, and meets the requirements that vd2 is more than or equal to 81, vd3 is less than or equal to 26, and vd2-vd3 is more than 55, wherein vd3 is the dispersion coefficient of the third lens.
Further, the optical imaging lens further satisfies the following conditions: vd4 is less than or equal to 33, vd5 is more than or equal to 56, and vd5-vd4 is more than 23, wherein vd4 and vd5 are the dispersion coefficients of the fourth lens and the fifth lens respectively.
Further, the optical imaging lens further satisfies the following conditions: 0.8< fa/fb <1.3, where fa is the focal length of the front group lenses (first to third lenses) and fb is the focal length of the rear group lenses (fourth to sixth lenses).
Further, the optical imaging lens further satisfies the following conditions: 1.5 & lt fa/f1 & lt 2.5, where f1 is the focal length of the first lens and fa is the focal length of the front group lens.
Further, the optical imaging lens further satisfies the following conditions: f1/f is more than 0.3 and less than 1, and f2/f is more than 0.3 and less than 1, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.
Further, the optical imaging lens further satisfies the following conditions: 0.3 < f1/f <1, 0.8< | f6/f | <1.3, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f6 is the focal length of the sixth lens.
The invention has the beneficial technical effects that:
the invention adopts six lenses, and through the arrangement design of each lens, realizes high relative illumination at a focal length of 50mm, and can realize clear color images under the condition of poor light; the distortion is small, the image is almost not deformed, and the restoration of the image is more accurate; the resolution ratio is high, and the imaging quality is excellent; the field-of-view chromatic aberration is small, and the color reducibility is good; focusing at normal temperature, and non-volatile coking at high and low temperatures; and the image surface is large.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a MTF plot of 0.435-0.656 μm at room temperature (25 ℃) in accordance with an embodiment of the present invention;
FIG. 3 is a graph of MTF at low temperature (-30 ℃) of 0.435 to 0.656 μm in one example of the present invention;
FIG. 4 is a graph of MTF at 0.435-0.656 μm at high temperature (70 ℃ C.) in accordance with one embodiment of the present invention;
FIG. 5 is a distortion diagram of the first embodiment of the present invention;
FIG. 6 is a vertical axis aberration diagram according to the first embodiment of the present invention;
FIG. 7 is a schematic diagram of a lateral chromatic aberration curve according to a first embodiment of the present invention;
FIG. 8 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 9 is a MTF chart at room temperature (25 ℃) of 0.435 to 0.656 μm in example II of the present invention;
FIG. 10 is a graph showing MTF at low temperature (-30 ℃) of 0.435 to 0.656 μm in example two of the present invention;
FIG. 11 is a graph showing MTF at high temperature (70 ℃) in the range of 0.435 to 0.656 μm in example two according to the present invention;
FIG. 12 is a distortion diagram of the second embodiment of the present invention;
FIG. 13 is a vertical axis aberration diagram according to a second embodiment of the present invention;
FIG. 14 is a schematic diagram of a lateral chromatic aberration curve according to a second embodiment of the present invention;
FIG. 15 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 16 is a MTF chart at room temperature (25 ℃) of 0.435 to 0.656 μm in example III of the present invention;
FIG. 17 is a graph showing MTF at low temperature (-30 ℃) of 0.435 to 0.656 μm in example three of the present invention;
FIG. 18 is a graph showing MTF at high temperature (70 ℃) in the range of 0.435 to 0.656 μm in example three according to the present invention;
FIG. 19 is a distortion diagram of a third embodiment of the present invention;
FIG. 20 is a vertical axis aberration diagram according to the third embodiment of the present invention;
FIG. 21 is a schematic diagram of a lateral chromatic aberration curve according to a third embodiment of the present invention;
FIG. 22 is a schematic structural diagram according to a fourth embodiment of the present invention;
FIG. 23 is a MTF chart at room temperature (25 ℃) of 0.435 to 0.656 μm in example four of the present invention;
FIG. 24 is a graph showing MTF at low temperature (-30 ℃) of 0.435 to 0.656 μm in example four of the present invention;
FIG. 25 is a graph of MTF at high temperature (70 ℃) in the range of 0.435 to 0.656 μm for example four of the present invention;
FIG. 26 is a distortion diagram of the fourth embodiment of the present invention;
FIG. 27 is a vertical axis aberration diagram according to a fourth embodiment of the present invention;
FIG. 28 is a graph illustrating lateral chromatic aberration in accordance with a fourth embodiment of the present invention;
FIG. 29 is a table of values of relevant important parameters according to four embodiments of the present invention.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
As used herein, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The invention provides an optical imaging lens, which sequentially comprises a first lens, a third lens, a diaphragm, a fourth lens, a sixth lens and a fourth lens, wherein the first lens, the third lens, the diaphragm and the fourth lens are arranged from an object side to an image side along an optical axis, and the system performance is improved by adopting a symmetrical structure of 3 lenses in front of the diaphragm and 3 lenses behind the diaphragm; the first lens element to the sixth lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.
The first lens element with positive refractive index has a convex object-side surface and a concave image-side surface.
The second lens element with positive refractive index has a convex object-side surface and a concave image-side surface.
The third lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The sixth lens element with positive refractive index has a convex object-side surface.
The fourth lens and the fifth lens are mutually glued; the optical imaging lens has only the six lenses with the refractive indexes.
The invention adopts six lenses, and through the arrangement design of each lens, realizes high relative illumination at a focal length of 50mm, and can realize clear color images under the condition of poor light; the distortion is small, the image is almost not deformed, and the restoration of the image is more accurate; the resolution ratio is high, and the imaging quality is excellent; the field-of-view chromatic aberration is small, and the color reducibility is good; focusing at normal temperature, and non-volatile coking at high and low temperatures; and the image surface is large.
Preferably, the second lens and the third lens are mutually glued, so that chromatic aberration is further optimized, and image quality is improved.
More preferably, the optical imaging lens further satisfies: vd2>55, wherein vd2 is the abbe number of the second lens, and the temperature coefficient of refractive index dn/dt of the second lens is negative, further balancing the temperature drift.
More preferably, the second lens is made of fluorine crown glass or heavy phosphorus crown glass, so that chromatic aberration of the optical imaging lens is further effectively corrected, color reducibility is guaranteed, and image quality is improved.
More preferably, the third lens is made of heavy flint glass, and meets the requirements that vd2 is more than or equal to 81, vd3 is less than or equal to 26, and vd2-vd3 are more than 55, wherein the dispersion coefficient of the third lens of vd3 ensures effective chromatic aberration correction, and simultaneously well solves the problem that an imaging surface generates drift due to temperature, and the athermalization of an optical system is realized.
Preferably, the optical imaging lens further satisfies: vd4 is less than or equal to 33, vd5 is more than or equal to 56, and vd5-vd4 is more than 23, wherein vd4 and vd5 are dispersion coefficients of the fourth lens and the fifth lens respectively, and high-low dispersion materials are combined, so that chromatic aberration can be corrected, the image quality can be optimized, and the system performance can be improved.
Preferably, the optical imaging lens further satisfies: 0.8< fa/fb <1.3, where fa is the focal length of the front group lens and fb is the focal length of the rear group lens, controls the total system length and distortion of the optical imaging lens.
Preferably, the optical imaging lens further satisfies: 1.5 & ltfa/f 1 & lt 2.5, where f1 is the focal length of the first lens and fa is the focal length of the front group lens, controls the total system length and distortion of the optical imaging lens.
Preferably, the optical imaging lens further satisfies: and f1/f is more than 0.3 and less than 1, and f2/f is more than 0.3 and less than 1, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f2 is the focal length of the second lens, so that the distortion is further optimized.
Preferably, the optical imaging lens further satisfies: 0.3 < f1/f <1, 0.8< | f6/f | <1.3, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f6 is the focal length of the sixth lens, further optimizing distortion.
The optical imaging lens of the present invention will be described in detail below with specific embodiments.
Example one
As shown in fig. 1, an optical imaging lens includes, in order along an optical axis I, a first lens 1, a second lens 2, a third lens 3, a stop 7, a fourth lens 4, a fifth lens 5, a sixth lens 6, a filter 8, a protective sheet 9, and an image plane 10 from an object side a1 to an image side a2, where the first lens 1 to the sixth lens 6 each include an object side surface facing the object side a1 and passing an imaging light ray and an image side surface facing the image side a2 and passing the imaging light ray.
The first lens element 1 has a positive refractive index, the object-side surface 11 of the first lens element 1 is convex, and the image-side surface 12 of the first lens element 1 is concave.
The second lens element 2 has a positive refractive index, and an object-side surface 21 of the second lens element 2 is convex and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has a negative refractive index, and an object-side surface 31 of the third lens element 3 is convex and an image-side surface 32 of the third lens element 3 is concave.
The fourth lens element 4 has a negative refractive index, and an object-side surface 41 of the fourth lens element 4 is concave and an image-side surface 42 of the fourth lens element 4 is concave.
The fifth lens element 5 has a positive refractive index, and an object-side surface 51 of the fifth lens element 5 is convex and an image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 with positive refractive power has a convex object-side surface 61 of the sixth lens element 6, and a planar image-side surface 62 of the sixth lens element 6.
In this embodiment, the second lens 2 and the third lens 3 are cemented with each other, and the fourth lens 4 and the fifth lens 5 are cemented with each other, but in other embodiments, the second lens 2 and the third lens 3 may not be cemented with each other.
In this embodiment, the filter 8 may be an infrared filter for filtering infrared rays, but is not limited thereto.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
| Surface of | Radius of curvature/mm | Thickness/mm | Material of | Refractive index | Coefficient of dispersion | Focal length/mm | |
| - | Shot object surface | Infinity | 1300.000 | ||||
| 11 | First lens | 21.78 | 3.71 | Glass | 1.90 | 31.42 | 30.82 |
| 12 | 89.49 | 0.12 | |||||
| 21 | Second lens | 13.96 | 4.19 | Fluorine crown glass | 1.50 | 81.59 | 32.57 |
| 22 | 89.95 | 0 | |||||
| 31 | Third lens | 89.95 | 2.90 | Heavy flint glass | 1.81 | 25.48 | -13.98 |
| 32 | 9.94 | 5.78 | |||||
| 7 | Diaphragm | Infinity | 3.73 | ||||
| 41 | Fourth lens | -17.95 | 3.23 | Glass | 1.67 | 32.18 | -20.04 |
| 42 | 59.80 | 0 | |||||
| 51 | Fifth lens element | 59.80 | 2.43 | Glass | 1.62 | 56.73 | 27.29 |
| 52 | -23.48 | 4.67 | |||||
| 61 | Sixth lens element | 39.52 | 7.14 | Glass | 1.85 | 23.79 | 46.21 |
| 62 | Infinity | 7.87 | |||||
| 8 | Optical filter | Infinity | 0.30 | Glass | 1.52 | 64.21 | Infinity |
| - | Infinity | 10.00 | |||||
| 9 | Protective sheet | Infinity | 0.50 | Glass | 1.52 | 64.21 | Infinity |
| - | Infinity | 0.50 | |||||
| 10 | Image plane | Infinity |
Please refer to fig. 29 for values of the conditional expressions according to this embodiment.
Referring to fig. 2-4, it can be seen that the resolution of the present embodiment is good for the transfer function control, and at 150lp/mm, the full-field transfer function image is still greater than 30%, the imaging quality is good, and the normal temperature focusing is performed, and the high and low temperature focusing is not volatile; the distortion diagram is shown in detail in fig. 5, and it can be seen that the distortion is small, less than-0.2%, the image distortion is small, and the restoration of the image is relatively accurate; the vertical axis aberration diagram is shown in detail in fig. 6, and the transverse chromatic aberration diagram is shown in detail in fig. 7, so that the field aberration is small, and the color reproducibility is good.
In this embodiment, the focal length f of the optical imaging lens is 50mm, the aperture value FNO is 2.8, the relative illuminance is greater than 75%, the field angle FOV is 12 °, the image plane diameter Φ is 11mm, and the distance TTL between the object plane 11 and the imaging plane 10 of the first lens 1 on the optical axis is 57.1 mm.
Example two
As shown in fig. 8, the surface-type convexo-concave and refractive index of each lens element of this embodiment are substantially the same as those of the first embodiment, only the image-side surface 62 of the sixth lens element 6 is a concave surface, and the optical parameters such as the curvature radius of the surface of each lens element and the thickness of the lens element are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
Please refer to fig. 29 for values of the conditional expressions according to this embodiment.
Referring to fig. 9-11, it can be seen that the resolution of the present embodiment is good for the transfer function control, and at 150lp/mm, the full-field transfer function image is still greater than 30%, the imaging quality is good, and the normal temperature focusing is performed, and the high and low temperature focusing is not volatile; the distortion map is shown in detail in fig. 12, and it can be seen that the distortion is small, less than-0.2%, the image distortion is small, and the restoration of the image is relatively accurate; the vertical axis aberration diagram is shown in detail in fig. 13, and the transverse chromatic aberration diagram is shown in detail in fig. 14, so that the field aberration is small, and the color reproducibility is good.
In this embodiment, the focal length f of the optical imaging lens is 50mm, the aperture value FNO is 2.8, the relative illuminance is greater than 75%, the field angle FOV is 12 °, the image plane diameter Φ is 11mm, and the distance TTL between the object plane 11 and the imaging plane 10 of the first lens 1 on the optical axis is 57.5 mm.
EXAMPLE III
As shown in fig. 15, the surface convexities and concavities and refractive indexes of the lenses of the present embodiment are substantially the same as those of the first embodiment, only the image-side surface 62 of the sixth lens element 6 is a convex surface, and the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
Please refer to fig. 29 for values of the conditional expressions according to this embodiment.
Referring to fig. 16-18, it can be seen that the resolution of the present embodiment is good for the transfer function control, and at 150lp/mm, the full-field transfer function image is still greater than 30%, the imaging quality is good, and the normal temperature focusing is performed, and the high and low temperature focusing is not volatile; the distortion map is shown in detail in fig. 19, and it can be seen that the distortion is small, less than-0.2%, the image distortion is small, and the restoration of the image is relatively accurate; the vertical axis aberration diagram is shown in detail in fig. 20, and the transverse chromatic aberration diagram is shown in detail in fig. 21, so that the field aberration is small, and the color reproducibility is good.
In this embodiment, the focal length f of the optical imaging lens is 50mm, the aperture value FNO is 2.8, the relative illuminance is greater than 75%, the field angle FOV is 12 °, the image plane diameter Φ is 11mm, and the distance TTL between the object plane 11 and the imaging plane 10 of the first lens 1 on the optical axis is 57.5 mm.
Example four
As shown in fig. 22, the surface-type convexo-concave shapes and the refractive indexes of the lenses of the present embodiment and the first embodiment are substantially the same, only the image-side surface 62 of the sixth lens element 6 is a concave surface, and the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
Please refer to fig. 29 for values of the conditional expressions according to this embodiment.
The resolution of the present embodiment is shown in fig. 23-25, which shows that the transfer function is well controlled, and at 150lp/mm, the full-field transfer function image is still greater than 30%, the imaging quality is good, and the normal temperature focusing is performed, and the high and low temperature focusing is not easy to be performed; the distortion map is shown in detail in fig. 26, and it can be seen that the distortion is small, less than-0.2%, the image distortion is small, and the restoration of the image is relatively accurate; the vertical axis aberration diagram is shown in detail in fig. 27, and the transverse chromatic aberration diagram is shown in detail in fig. 28, so that the field aberration is small, and the color reproducibility is good.
In this embodiment, the focal length f of the optical imaging lens is 50mm, the aperture value FNO is 2.8, the relative illuminance is greater than 75%, the field angle FOV is 12 °, the image plane diameter Φ is 11mm, and the distance TTL between the object plane 11 and the imaging plane 10 of the first lens 1 on the optical axis is 57.5 mm.
The working object distance range of the optical imaging lens is 0.6 m-infinity, when the object distance changes, the whole group of lenses from the first lens 1 to the sixth lens 6 is used as a focusing group, and the focusing function is realized by the front and back movement of the focusing group.
The temperature application range of the optical imaging lens is-30-70 ℃.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An optical imaging lens characterized in that: the lens comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from an object side to an image side along an optical axis; the first lens element to the sixth lens element respectively comprise an object side surface facing the object side and allowing the imaging light to pass and an image side surface facing the image side and allowing the imaging light to pass;
the first lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface;
the fourth lens and the fifth lens are mutually glued; the optical imaging lens has only the six lenses with the refractive indexes.
2. The optical imaging lens according to claim 1, characterized in that: the second lens and the third lens are mutually glued.
3. The optical imaging lens of claim 2, further satisfying: vd2>55, wherein vd2 is the abbe number of the second lens, and the temperature coefficient of refraction dn/dt of the second lens is negative.
4. The optical imaging lens according to claim 3, characterized in that: the second lens is made of fluorine crown glass or heavy phosphorus crown glass.
5. The optical imaging lens according to claim 4, characterized in that: the third lens is made of heavy flint glass, and meets the requirements that vd2 is more than or equal to 81, vd3 is less than or equal to 26, and vd2-vd3 is more than 55, wherein vd3 is the dispersion coefficient of the third lens.
6. The optical imaging lens of claim 1, further satisfying: vd4 is less than or equal to 33, vd5 is more than or equal to 56, and vd5-vd4 is more than 23, wherein vd4 and vd5 are the dispersion coefficients of the fourth lens and the fifth lens respectively.
7. The optical imaging lens of claim 1, further satisfying: 0.8< fa/fb <1.3, where fa is the focal length of the front group lens and fb is the focal length of the back group lens.
8. The optical imaging lens of claim 1, further satisfying: 1.5 & lt fa/f1 & lt 2.5, where f1 is the focal length of the first lens and fa is the focal length of the front group lens.
9. The optical imaging lens of claim 1, further satisfying: f1/f is more than 0.3 and less than 1, and f2/f is more than 0.3 and less than 1, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.
10. The optical imaging lens of claim 1, further satisfying: 0.3 < f1/f <1, 0.8< | f6/f | <1.3, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f6 is the focal length of the sixth lens.
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