CN111142244A - Day and night dual-purpose optical imaging lens - Google Patents
Day and night dual-purpose optical imaging lens Download PDFInfo
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- CN111142244A CN111142244A CN202010068260.8A CN202010068260A CN111142244A CN 111142244 A CN111142244 A CN 111142244A CN 202010068260 A CN202010068260 A CN 202010068260A CN 111142244 A CN111142244 A CN 111142244A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 42
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- 238000003384 imaging method Methods 0.000 abstract description 8
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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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
- G02B13/0055—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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- 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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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Abstract
The invention relates to the technical field of lenses. The invention discloses a day and night dual-purpose optical imaging lens, which comprises ten lenses, wherein a first lens is a convex-concave lens with positive refractive index; the second lens is a convex-concave lens with negative refractive index; the third, sixth and tenth lens elements are concave-concave lens elements with negative refractive index; the fourth, fifth, seventh and ninth lenses are convex lenses with positive refractive index; the eighth lens element has a positive refractive index, and an object-side surface of the eighth lens element is convex. The invention has a large image plane; the resolution ratio is high, and the imaging quality is good; the high and low temperature coke loss is small or no coke loss; the light transmission is large; the total length is short; good confocal property of visible light and infrared light.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to a day and night dual-purpose optical imaging lens for intelligent traffic.
Background
With the continuous progress of scientific 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, intelligent traffic systems and the like, so that the requirements on the optical imaging lenses are higher and higher.
In an intelligent traffic system, the performance of an optical imaging lens is critical, and the reliability of the whole system is affected. However, the image plane of the optical imaging lens applied to a 50mm focal length section of an intelligent traffic system is small, and is generally 1/1.7 inch to 1.1 inch; the control on the transfer function is poor, and the resolution is low; when the coke is used in high and low temperature environments, the coke loss is serious; the light passing is generally small, the light entering brightness is low in a low-light environment, and the shot picture is dark; when the method is applied to an infrared band, obvious defocusing can occur; in order to meet the requirements of high resolution, large and complex lens, long total length and incapability of meeting the increasing requirements of intelligent traffic systems, improvement is urgently needed.
Disclosure of Invention
The invention aims to provide an optical imaging lens for day and night use to solve the technical problems.
In order to achieve the purpose, the invention adopts the technical scheme that: an optical imaging lens for day and night use 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 along an optical axis; the first lens element to the tenth 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 negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a convex 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 negative refractive index has a concave object-side surface and a concave image-side surface;
the seventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface;
the ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the tenth lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
the third lens and the fourth lens are mutually cemented and/or the sixth lens and the seventh lens are mutually cemented and/or the ninth lens and the tenth lens are mutually cemented;
the optical imaging lens has only ten lenses with refractive indexes.
Further, the sixth lens and the seventh lens are mutually cemented, the ninth lens and the tenth lens are mutually cemented, and the following conditions are met: vd7-vd6 > 20, vd9-vd10 > 20, wherein vd6, vd7, vd9 and vd10 are the abbe numbers of the sixth lens, the seventh lens, the ninth lens and the tenth lens, respectively.
Further, the third lens and the fourth lens are mutually cemented, the sixth lens and the seventh lens are mutually cemented, and the following conditions are met: 0.7< | R34/R67| <1.25, wherein R34 is the radius of curvature of the cemented surface of the third lens and the fourth lens, and R67 is the radius of curvature of the cemented surface of the sixth lens and the seventh lens.
Further, the optical imaging lens further satisfies the following conditions: 0.7< f1/f 8< 1.5, wherein f1 and f8 are focal lengths of the first lens and the eighth lens, respectively.
Further, the optical imaging lens further satisfies the following conditions: 0.7< | f4/f6| < 1.5, where f4 and f6 are the focal lengths of the fourth and sixth lenses, respectively.
Further, the optical imaging lens further satisfies the following conditions: vd2 > 50, vd8 > 50, where vd2 and vd8 are the abbe numbers of the second lens and the eighth lens, respectively.
Further, the optical imaging lens further satisfies the following conditions: 1< | R12/R11| <2.5, wherein R11 and R12 are radii of curvature of the object-side surface and the image-side surface of the first lens, respectively.
Further, the optical imaging lens further satisfies the following conditions: 0.7< | R51/R81| <1.25, wherein R51 and R81 are radii of curvature of object side surfaces of the fifth lens and the eighth lens, respectively.
Further, the temperature coefficient of refractive index of the eighth lens is negative.
Further, the optical imaging lens further satisfies the following conditions: 1.5< nd1<1.8, 1.5< nd2<1.7, 1.8< nd5<2.05, 1.5< nd8<1.8, wherein nd1, nd2, nd5 and nd8 are refractive indices of the first lens, the second lens, the fifth lens and the eighth lens, respectively.
The invention has the beneficial technical effects that:
the invention adopts ten lenses, and has a sensor with a large image surface and capable of supporting 4/3 inches by the arrangement design of the refractive index and the surface shape of each lens; the resolution is high, and more than 12M of pixels can be supported; the whole system is optimized without heating, the focusing is carried out at normal temperature, and the high and low temperature defocusing is small or not defocusing; the light transmission is large, more light input quantity can be obtained, the picture is bright, and the low-light effect is good; the confocal property of visible light and infrared light is good; the total length is shorter.
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 defocus plot of 0.435-0.650 μm visible light in accordance with the first embodiment of the present invention;
FIG. 3 is a defocus plot of 0.850 μm infrared in accordance with the first embodiment of the present invention;
FIG. 4 is a graph of MTF of 0.435-0.650 μm at room temperature (20 ℃ C.) in accordance with an embodiment of the present invention;
FIG. 5 is a graph of MTF at 0.435-0.650 μm at a high temperature (70 ℃ C.) in accordance with an embodiment of the present invention;
FIG. 6 is a graph of MTF at 0.435-0.650 μm at low temperature (-30 ℃ C.) in accordance with an embodiment of the present invention;
FIG. 7 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 8 is a defocus plot of 0.490-0.625 μm visible light in the second embodiment of the present invention;
FIG. 9 is a defocus graph of 0.850 μm infrared in the second embodiment of the present invention;
FIG. 10 is a graph of MTF at 0.435-0.650 μm at room temperature (20 ℃ C.) for example two of the present invention;
FIG. 11 is a graph of MTF at 0.435-0.650 μm at high temperature (70 ℃ C.) according to example two of the present invention;
FIG. 12 is a graph of MTF at 0.435-0.650 μm at low temperature (-30 ℃ C.) in accordance with example two of the present invention;
FIG. 13 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 14 is a defocus plot of 0.490-0.625 μm visible light in the third embodiment of the present invention;
FIG. 15 is a defocus graph of 0.850 μm infrared in the third embodiment of the present invention;
FIG. 16 is a graph of MTF at 0.435-0.650 μm at three temperatures (20 ℃ C.) for the example of the present invention;
FIG. 17 is a graph of MTF at 0.435-0.650 μm at three high temperatures (70 ℃ C.) in accordance with an embodiment of the present invention;
FIG. 18 is a graph of MTF at 0.435-0.650 μm at low temperature (-30 ℃ C.) in accordance with example three of the present invention;
FIG. 19 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 20 is a defocus plot of 0.490-0.625 μm visible light for example four of the present invention;
FIG. 21 is a defocus plot of 0.850 μm infrared in accordance with example four of the present invention;
FIG. 22 is a graph of MTF at 0.435-0.650 μm at four normal temperatures (20 ℃ C.) for the example of the present invention;
FIG. 23 is a graph of MTF at 0.435-0.650 μm at four high temperatures (70 ℃ C.) for example of the present invention;
FIG. 24 is a graph of MTF at low temperature (-30 ℃) of 0.435 to 0.650 μm in example four of the present invention;
FIG. 25 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 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 a day and night dual-purpose optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis; the first lens element to the tenth 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 negative refractive index has a convex object-side surface and a concave image-side surface.
The third lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The fourth lens element with positive refractive power has a convex object-side surface and a convex 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 negative refractive power has a concave object-side surface and a concave image-side surface.
The seventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The eighth lens element with positive refractive index has a convex object-side surface.
The ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The tenth lens element with negative refractive power has a concave object-side surface and a concave image-side surface.
The third lens and the fourth lens are mutually cemented and/or the sixth lens and the seventh lens are mutually cemented and/or the ninth lens and the tenth lens are mutually cemented; the optical imaging lens has only ten lenses with refractive indexes.
The invention adopts ten lenses, and has a sensor with a large image surface and capable of supporting 4/3 inches by the arrangement design of the refractive index and the surface shape of each lens; the resolution is high, and more than 12M of pixels can be supported; the whole system is optimized without heating, the focusing is carried out at normal temperature, and the high and low temperature defocusing is small or not defocusing; the light transmission is large, more light input quantity can be obtained, the picture is bright, and the low-light effect is good; the confocal property of visible light and infrared light is good; the total length is shorter.
Preferably, the sixth lens and the seventh lens are cemented with each other, and the ninth lens and the tenth lens are cemented with each other, and satisfy: vd7-vd6 > 20, vd9-vd10 > 20, wherein vd6, vd7, vd9 and vd10 are respectively the dispersion coefficients of the sixth lens, the seventh lens, the ninth lens and the tenth lens, further achromatizing and optimizing the confocal property of visible light and infrared light.
Preferably, the third lens and the fourth lens are mutually cemented, and the sixth lens and the seventh lens are mutually cemented, and satisfy: 0.7< | R34/R67| <1.25, wherein R34 is the curvature radius of the cemented surface of the third lens and the fourth lens, and R67 is the curvature radius of the cemented surface of the sixth lens and the seventh lens, further optimizing the temperature drift.
Preferably, the optical imaging lens further satisfies: 0.7< f1/f 8< 1.5, wherein f1 and f8 are the focal lengths of the first lens and the eighth lens respectively, and the temperature drift is further optimized.
Preferably, the optical imaging lens further satisfies: 0.7< | f4/f6| < 1.5, wherein f4 and f6 are the focal lengths of the fourth lens and the sixth lens, respectively, further optimizing the temperature drift.
Preferably, the optical imaging lens further satisfies: vd2 > 50 and vd8 > 50, wherein vd2 and vd8 are the abbe numbers of the second lens and the eighth lens, respectively, further achromatizing and optimizing the confocality between visible light and infrared light.
Preferably, the optical imaging lens further satisfies: 1< | R12/R11| <2.5, wherein R11 and R12 are the curvature radii of the object side surface and the image side surface of the first lens respectively, and the temperature drift is further optimized.
Preferably, the optical imaging lens further satisfies: 0.7< | R51/R81| <1.25, wherein R51 and R81 are the radii of curvature of the object side surfaces of the fifth lens and the eighth lens, respectively, further optimizing the temperature drift.
Preferably, the temperature coefficient of refractive index of the eighth lens is negative to balance temperature drift.
Preferably, the optical imaging lens further satisfies: 1.5< nd1<1.8, 1.5< nd2<1.7, 1.8< nd5<2.05 and 1.5< nd8<1.8, wherein nd1, nd2, nd5 and nd8 are refractive indexes of the first lens, the second lens, the fifth lens and the eighth lens respectively, so that good visible and infrared confocality can be realized, and system performance is optimized.
Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the fifth lens and the sixth lens, so that the process sensitivity is reduced, and the assembly yield is improved.
The optical imaging lens of the present invention will be described in detail below with specific embodiments.
Example one
As shown in fig. 1, the optical imaging lens for day and night use includes, in order along an optical axis I, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a stop 110, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 100, and an image plane 120 from an object side a1 to an image side a2, where each of the first lens 1 to the tenth lens 100 includes 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 negative 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 concave and an image-side surface 32 of the third lens element 3 is concave.
The fourth lens element 4 has a positive refractive index, the object-side surface 41 of the fourth lens element 4 is convex, and the image-side surface 42 of the fourth lens element 4 is convex.
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 has a negative refractive index, and an object-side surface 61 of the sixth lens element 6 is concave and an image-side surface 62 of the sixth lens element 6 is concave.
The seventh lens element 7 has a positive refractive index, and an object-side surface 71 of the seventh lens element 7 is convex and an image-side surface 72 of the seventh lens element 7 is convex.
The eighth lens element 8 with positive refractive power has a convex object-side surface 81 of the eighth lens element 8 and a convex image-side surface 82 of the eighth lens element 8, although the image-side surface 82 of the eighth lens element 8 can be planar or concave in other embodiments.
The ninth lens element 9 with positive refractive power has a convex object-side surface 91 of the ninth lens element 9 and a convex image-side surface 92 of the ninth lens element 9.
The tenth lens element 100 has a negative refractive index, and an object-side surface 101 of the tenth lens element 100 is concave and an image-side surface 102 of the tenth lens element 100 is concave.
In this embodiment, the image-side surface 32 of the third lens element 3 and the object-side surface 41 of the fourth lens element 4 are cemented with each other, the image-side surface 62 of the sixth lens element 6 and the object-side surface 71 of the seventh lens element 7 are cemented with each other, the image-side surface 92 of the ninth lens element 9 and the object-side surface 101 of the tenth lens element 100 are cemented with each other, and three sets of cemented lenses are used to achieve better visible and infrared confocal performance, but of course, in some embodiments, only the third lens element 3 and the fourth lens element 4 may be cemented with each other, or the sixth lens element 6 and the seventh lens element 7 may be cemented with each other, or the ninth lens element 9 and the tenth lens element 100 may be cemented with each other; in other embodiments, the third lens 3 and the fourth lens 4 may be cemented with each other, and the sixth lens 6 and the seventh lens 7 may be cemented with each other; or the sixth lens 6 and the seventh lens 7 are cemented with each other, and the ninth lens 9 and the tenth lens 100 are cemented with each other; or the third lens 3 and the fourth lens 4 are cemented with each other, and the ninth lens 9 and the tenth lens 100 are cemented with each other.
In this embodiment, the temperature coefficient of refractive index dn/dt of the eighth lens 8 is negative.
Of course, in some embodiments, the stop 110 may also be disposed between other lenses.
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/spacing (mm) | Material of | Refractive index | Coefficient of dispersion | Focal length (mm) | ||
| - | Article | Infinity | Infinity | |||||
| 11 | First lens | 25.151 | 5 | Glass | 1.72 | 43.68 | 84.5 | |
| 12 | 39.166 | 0.24 | ||||||
| 21 | Second lens | 26.592 | 3.95 | Glass | 1.620 | 60.36 | -69.7 | |
| 22 | 15.551 | 11.79 | ||||||
| 31 | Third lens | -30.778 | 2.58 | Glass | 1.846 | 23.79 | -14.3 | |
| 32 | 21.059 | 0 | ||||||
| 41 | Fourth lens | 21.059 | 7.95 | Glass | 1.756 | 47.71 | 20.6 | |
| 42 | -51.963 | 7.89 | ||||||
| 51 | Fifth lens element | 56.167 | 6.22 | Glass | 1.948 | 17.94 | 32.8 | |
| 52 | -67.848 | 1.64 | ||||||
| 110 | Diaphragm | Infinity | 4.29 | |||||
| 61 | Sixth lens element | -39.231 | 1.97 | Glass | 1.639 | 34.48 | -20.1 | |
| 62 | 19.693 | 0 | ||||||
| 71 | Seventh lens element | 19.693 | 10.72 | Glass | 1.607 | 56.65 | 21.5 | |
| 72 | -31.458 | 0.254 | ||||||
| 81 | Eighth lens element | 58.588 | 3.36 | Glass | 1.617 | 63.41 | 82.1 | |
| 82 | -382.033 | 0.07 | ||||||
| 91 | Ninth lens | 39.065 | 5.97 | Glass | 1.612 | 58.57 | 27.0 | |
| 92 | -27.291 | 0 | ||||||
| 101 | Tenth lens | -27.291 | 8.07 | Glass | 1.903 | 31.31 | -14.1 | |
| 102 | 27.537 | 23.34 | ||||||
| 120 | Image plane | Infinity |
Please refer to fig. 25 for values of the conditional expressions according to this embodiment.
Referring to fig. 2 and 3, it can be seen that the confocal property of the visible light and the infrared light is good, and the defocusing amount when the visible light and the infrared light are switched is 9 μm; referring to fig. 4-6, it can be seen that the resolution is high, the spatial frequency can reach 145lp/mm, the requirement of image quality over 12M is met, and almost no defocus occurs at high and low temperatures.
In this embodiment, the focal length f of the optical imaging lens is 50mm, the aperture value FNO is 1.5, the image plane diameter Φ is 22mm, the distance TTL between the object-side surface 11 of the first lens 1 and the imaging plane 140 on the optical axis I is 106mm, and the field angle FOV is 26.2 °.
Example two
As shown in fig. 7, in this embodiment, the surface convexoconcave and the refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens 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. 25 for values of the conditional expressions according to this embodiment.
Referring to fig. 8 and 9, it can be seen that the confocal property of the visible light and the infrared light is good, and the defocusing amount when the visible light and the infrared light are switched is 10 μm; referring to fig. 10-12, it can be seen that the resolution is high, the spatial frequency can reach 145lp/mm, the requirement of image quality over 12M is satisfied, and almost no defocus occurs at high and low temperatures.
In this embodiment, the focal length f of the optical imaging lens is 49.5mm, the aperture value FNO is 1.5, the image plane diameter Φ is 22.5mm, the distance TTL between the object-side surface 11 of the first lens 1 and the imaging plane 140 on the optical axis I is 113mm, and the field angle FOV is 26.0 °.
EXAMPLE III
As shown in fig. 13, the lens elements of this embodiment have the same surface irregularities and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens element 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. 25 for values of the conditional expressions according to this embodiment.
Referring to fig. 14 and 15, it can be seen that the confocal property of the visible light and the infrared light is good, and the defocusing amount when the visible light and the infrared light are switched is 10 μm; referring to fig. 16-18, it can be seen that the resolution is high, the spatial frequency can reach 145lp/mm, the requirement of image quality above 12M can be met, and almost no defocus occurs at high and low temperatures.
In this embodiment, the focal length f of the optical imaging lens is 50mm, the aperture value FNO is 1.5, the image plane diameter Φ is 22.5mm, the distance TTL between the object-side surface 11 of the first lens 1 and the imaging plane 140 on the optical axis I is 115mm, and the field angle FOV is 26.2 °.
Example four
As shown in fig. 19, 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 82 of the eighth lens element 8 is a concave surface, and the optical parameters such as the curvature radius of the lens surface 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. 25 for values of the conditional expressions according to this embodiment.
Referring to fig. 20 and 21, it can be seen that the confocal property of the visible light and the infrared light is good, and the defocusing amount when the visible light and the infrared light are switched is 10 μm; referring to fig. 22-24, it can be seen that the resolution is high, the spatial frequency can reach 145lp/mm, the requirement of image quality over 12M is satisfied, and almost no defocus occurs at high and low temperatures.
In this embodiment, the focal length f of the optical imaging lens is 50mm, the aperture value FNO is 1.5, the image plane diameter Φ is 22.6mm, the distance TTL between the object-side surface 11 of the first lens 1 and the imaging plane 140 on the optical axis I is 103mm, and the field angle FOV is 26.0 °.
The invention can be used in the temperature range of-40 ℃ to 70 ℃ and can ensure that the picture is clear and not out of focus.
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. A day and night optical imaging lens is characterized in that: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side along an optical axis; the first lens element to the tenth 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 negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a convex 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 negative refractive index has a concave object-side surface and a concave image-side surface;
the seventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the eighth lens element with positive refractive index has a convex object-side surface;
the ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the tenth lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
the third lens and the fourth lens are mutually cemented and/or the sixth lens and the seventh lens are mutually cemented and/or the ninth lens and the tenth lens are mutually cemented;
the optical imaging lens has only ten lenses with refractive indexes.
2. The optical imaging lens for day and night use according to claim 1, characterized in that: the sixth lens and the seventh lens are mutually glued, the ninth lens and the tenth lens are mutually glued, and the following conditions are met: vd7-vd6 > 20, vd9-vd10 > 20, wherein vd6, vd7, vd9 and vd10 are the abbe numbers of the sixth lens, the seventh lens, the ninth lens and the tenth lens, respectively.
3. The optical imaging lens for day and night use according to claim 1, characterized in that: the third lens and the fourth lens are mutually glued, the sixth lens and the seventh lens are mutually glued, and the following conditions are met: 0.7< | R34/R67| <1.25, wherein R34 is the radius of curvature of the cemented surface of the third lens and the fourth lens, and R67 is the radius of curvature of the cemented surface of the sixth lens and the seventh lens.
4. The optical imaging lens for day and night use according to claim 1, further comprising: 0.7< f1/f 8< 1.5, wherein f1 and f8 are focal lengths of the first lens and the eighth lens, respectively.
5. The optical imaging lens for day and night use according to claim 1, further comprising: 0.7< | f4/f6| < 1.5, where f4 and f6 are the focal lengths of the fourth and sixth lenses, respectively.
6. The optical imaging lens for day and night use according to claim 1, further comprising: vd2 > 50, vd8 > 50, where vd2 and vd8 are the abbe numbers of the second lens and the eighth lens, respectively.
7. The optical imaging lens for day and night use according to claim 1, further comprising: 1< | R12/R11| <2.5, wherein R11 and R12 are radii of curvature of the object-side surface and the image-side surface of the first lens, respectively.
8. The optical imaging lens for day and night use according to claim 1, further comprising: 0.7< | R51/R81| <1.25, wherein R51 and R81 are radii of curvature of object side surfaces of the fifth lens and the eighth lens, respectively.
9. The optical imaging lens for day and night use according to claim 1, characterized in that: the temperature coefficient of refractive index of the eighth lens is a negative value.
10. The optical imaging lens for day and night use according to claim 1, further comprising: 1.5< nd1<1.8, 1.5< nd2<1.7, 1.8< nd5<2.05, 1.5< nd8<1.8, wherein nd1, nd2, nd5 and nd8 are refractive indices of the first lens, the second lens, the fifth lens and the eighth lens, respectively.
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| CN202010068260.8A CN111142244B (en) | 2020-01-21 | 2020-01-21 | Day and night optical imaging lens |
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| CN202010068260.8A CN111142244B (en) | 2020-01-21 | 2020-01-21 | Day and night optical imaging lens |
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| CN111142244B CN111142244B (en) | 2024-08-20 |
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| US20160011403A1 (en) * | 2013-03-26 | 2016-01-14 | Fujifilm Corporation | Imaging lens and imaging apparatus |
| US20160299415A1 (en) * | 2015-02-18 | 2016-10-13 | Seiko Epson Corporation | Projection optical system |
| US20170293110A1 (en) * | 2016-04-06 | 2017-10-12 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system |
| US20180196228A1 (en) * | 2017-01-11 | 2018-07-12 | Genius Electronic Optical Co., Ltd. | Ocular optical system |
| CN211236424U (en) * | 2020-01-21 | 2020-08-11 | 厦门力鼎光电股份有限公司 | Day and night dual-purpose optical imaging lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160011403A1 (en) * | 2013-03-26 | 2016-01-14 | Fujifilm Corporation | Imaging lens and imaging apparatus |
| US20160299415A1 (en) * | 2015-02-18 | 2016-10-13 | Seiko Epson Corporation | Projection optical system |
| US20170293110A1 (en) * | 2016-04-06 | 2017-10-12 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system |
| US20180196228A1 (en) * | 2017-01-11 | 2018-07-12 | Genius Electronic Optical Co., Ltd. | Ocular optical system |
| CN211236424U (en) * | 2020-01-21 | 2020-08-11 | 厦门力鼎光电股份有限公司 | Day and night dual-purpose optical imaging lens |
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