CN111142244B - Day and night optical imaging lens - Google Patents
Day and night optical imaging lens Download PDFInfo
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- CN111142244B CN111142244B CN202010068260.8A CN202010068260A CN111142244B CN 111142244 B CN111142244 B CN 111142244B CN 202010068260 A CN202010068260 A CN 202010068260A CN 111142244 B CN111142244 B CN 111142244B
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 39
- 238000003384 imaging method Methods 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims description 21
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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
- G02B13/14—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 an optical imaging lens for day and night use, which comprises ten lenses, wherein the 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 lenses are concave lenses with negative refractive power; the fourth, fifth, seventh and ninth lenses are convex-convex lenses with positive refractive index; the eighth lens has positive refractive index, and the object side surface of the eighth lens is a convex surface. The invention has a large image plane; the resolution is high, and the imaging quality is good; little or no defocus at high and low temperature; the light transmission is large; the total length is short; the visible light and infrared confocal property is good.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to an optical imaging lens for day and night use in intelligent transportation.
Background
With the continuous progress of science and technology and the continuous development of society, in recent years, an optical imaging lens is also rapidly developed and is widely applied to various fields such as smart phones, tablet personal computers, video conferences, vehicle-mounted monitoring, security monitoring and intelligent transportation systems, and therefore, the requirements on the optical imaging lens are also higher and higher.
In an intelligent traffic system, the performance of an optical imaging lens is critical, and the reliability of the whole system can be affected. However, the current optical imaging lens applied to the 50mm focal length section of the intelligent traffic system has a smaller image surface, generally 1/1.7 inch to 1.1 inch; poor transfer control and low resolution; when the lens is used in a high-low temperature environment, the defocus is serious; the light transmission is generally smaller, the light entering is lower in the low-illumination environment, and the photographed picture is darker; when the infrared light source is applied to an infrared band, obvious defocusing can occur; in order to meet the requirements of high resolution, the number of lenses is large and complex, the total length is long, and the requirements of an intelligent traffic system which are increasingly increased cannot be met, so that improvement is urgently needed.
Disclosure of Invention
The invention aims to provide an optical imaging lens for day and night use, which is used for solving the technical problems.
In order to achieve the above purpose, the invention adopts the following technical scheme: an optical imaging lens for day and night comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence along an optical axis from an object side to an image side; the first lens element to the tenth lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has positive refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
The third lens has negative refractive index, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
The fifth lens has positive refractive index, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative refractive power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface;
the seventh lens has positive refractive index, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface;
the eighth lens has positive refractive index, and the object side surface of the eighth lens is a convex surface;
the ninth lens has positive refractive index, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface;
the tenth lens has negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface of the tenth lens is a concave surface;
the third lens and the fourth lens are glued mutually and/or the sixth lens and the seventh lens are glued mutually and/or the ninth lens and the tenth lens are glued mutually;
The optical imaging lens has only ten lenses with refractive index.
Further, the sixth lens and the seventh lens are cemented with each other, the ninth lens and the tenth lens are cemented with each other, and the following are satisfied: vd7-vd6 > 20, vd9-vd10 > 20, wherein vd6, vd7, vd9 and vd10 are the abbe numbers of the sixth, seventh, ninth and tenth lenses, respectively.
Further, the third lens and the fourth lens are glued to each other, the sixth lens and the seventh lens are glued to each other, and the following conditions are satisfied: 0.7< |R34/R67| <1.25, wherein R34 is the curvature radius of the bonding surface of the third lens and the fourth lens, and R67 is the curvature radius of the bonding surface of the sixth lens and the seventh lens.
Further, the optical imaging lens further satisfies: 0.7 < f1/f8 < 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: 0.7 < |f4/f6| < 1.5, wherein f4 and f6 are the focal lengths of the fourth and sixth lenses, respectively.
Further, the optical imaging lens further satisfies: vd2 > 50 and vd 8> 50, wherein vd2 and vd8 are the abbe numbers of the second and eighth lenses, respectively.
Further, the optical imaging lens further satisfies: 1< |r12/r11| <2.5, wherein R11 and R12 are radii of curvature of an object side surface and an image side surface of the first lens, respectively.
Further, the optical imaging lens further satisfies: 0.7< |r51/r81| <1.25, wherein R51 and R81 are radii of curvature of the object side surfaces of the fifth lens and the eighth lens, respectively.
Further, the refractive index temperature coefficient of the eighth lens is a negative value.
Further, the optical imaging lens further satisfies: 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, second, fifth, and eighth lenses, respectively.
The beneficial technical effects of the invention are as follows:
The invention adopts ten lenses, and has a large image surface by the arrangement design of the refractive index and the surface shape of each lens, and can support a sensor of 4/3 inch; the resolution is high, and more than 12M pixels can be supported; the whole system is optimized without heating, is focused at normal temperature, and has little or no defocus at high and low temperatures; the light is large, more light quantity can be obtained, the picture is brighter, and the low-illumination effect is good; the visible light and infrared confocal performance is good; the overall length is short.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a graph showing defocus of 0.435-0.650 μm for visible light according to the first embodiment of the present invention;
FIG. 3 is a graph of infrared 0.850 μm defocus for the first embodiment of the present invention;
FIG. 4 is a graph showing MTF at room temperature (20 ℃ C.) of 0.435-0.650 μm according to the first embodiment of the present invention;
FIG. 5 is a graph showing MTF at high temperature (70 ℃ C.) of 0.435-0.650 μm in accordance with an embodiment of the present invention;
FIG. 6 is a graph showing MTF at low temperature (-30 ℃) of 0.435-0.650 μm for example of the present invention;
FIG. 7 is a schematic diagram of a second embodiment of the present invention;
FIG. 8 is a graph of defocus of 0.490-0.625 μm for visible light according to the second embodiment of the present invention;
FIG. 9 is a graph of infrared 0.850 μm defocus for the second embodiment of the present invention;
FIG. 10 is a graph showing MTF at room temperature (20 ℃ C.) of 0.435 to 0.650 μm in example II of the present invention;
FIG. 11 is a graph showing MTF at high temperature (70 ℃ C.) of 0.435 to 0.650 μm in example II of the present invention;
FIG. 12 is a graph showing MTF at low temperature (-30 ℃) of 0.435-0.650 μm for example II of the invention;
FIG. 13 is a schematic diagram of a third embodiment of the present invention;
FIG. 14 is a graph showing defocus curves for visible light of 0.490-0.625 μm for example III of the present invention;
FIG. 15 is a plot of infrared 0.850 μm defocus for example three of the present invention;
FIG. 16 is a graph showing MTF at room temperature (20 ℃) of 0.435 to 0.650 μm for example III of the present invention;
FIG. 17 is a graph showing MTF at three high temperatures (70 ℃ C.) of 0.435-0.650 μm in example of the present invention;
FIG. 18 is a graph showing MTF at low temperature (-30 ℃) of 0.435 to 0.650 μm for example III of the invention;
FIG. 19 is a schematic view of a fourth embodiment of the present invention;
FIG. 20 is a graph showing defocus curves for visible light of 0.490-0.625 μm for example IV of the present invention;
FIG. 21 is a graph of infrared 0.850 μm defocus for example four of the present invention;
FIG. 22 is a graph showing MTF at room temperature (20 ℃ C.) of 0.435 to 0.650 μm in example IV of the present invention;
FIG. 23 is a graph showing MTF at high temperature (70 ℃ C.) of 0.435 to 0.650 μm in example IV of the present invention;
FIG. 24 is a graph showing MTF at low temperature (-30 ℃) of 0.435 to 0.650 μm for example IV of the invention;
FIG. 25 is a table showing the values of the relevant important parameters according to four embodiments of the present invention.
Detailed Description
For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.
The invention will now be further described with reference to the drawings and detailed description.
The term "a lens having a positive refractive index (or negative refractive index)" as used herein means that the paraxial refractive index of the lens calculated by Gaussian optics theory 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 surface roughness determination of the lens can be performed by a determination method by a person of ordinary skill in the art, that is, by a sign of a radius of curvature (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 the lens data table (LENSDATASHEET) of optical design software. When the R value is positive, the object side surface is judged to be convex; when the R value is negative, the object side surface is judged to be a concave surface. On the contrary, when the R value is positive, the image side surface is judged to be concave; when the R value is negative, the image side surface is determined to be convex.
The invention provides a day and night 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 comprise an object side surface facing the object side and passing the imaging light beam and an image side surface facing the image side and passing the imaging light beam.
The first lens has positive refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface.
The second lens has negative refractive power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface.
The third lens has negative refractive power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface.
The fourth lens element has positive refractive power, wherein an object-side surface of the fourth lens element is convex, and an image-side surface of the fourth lens element is convex.
The fifth lens element has positive refractive index, wherein an object-side surface of the fifth lens element is convex, and an image-side surface of the fifth lens element is convex.
The sixth lens element has a negative refractive power, wherein an object-side surface of the sixth lens element is a concave surface, and an image-side surface of the sixth lens element is a concave surface.
The seventh lens has positive refractive index, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface.
The eighth lens has positive refractive index, and the object side surface of the eighth lens is a convex surface.
The ninth lens element has positive refractive power, wherein an object-side surface of the ninth lens element is convex, and an image-side surface of the ninth lens element is convex.
The tenth lens has negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface of the tenth lens is a concave surface.
The third lens and the fourth lens are glued mutually and/or the sixth lens and the seventh lens are glued mutually and/or the ninth lens and the tenth lens are glued mutually; the optical imaging lens has only ten lenses with refractive index.
The invention adopts ten lenses, and has a large image surface by the arrangement design of the refractive index and the surface shape of each lens, and can support a sensor of 4/3 inch; the resolution is high, and more than 12M pixels can be supported; the whole system is optimized without heating, is focused at normal temperature, and has little or no defocus at high and low temperatures; the light is large, more light quantity can be obtained, the picture is brighter, and the low-illumination effect is good; the visible light and infrared confocal performance is good; the overall length is short.
Preferably, the sixth lens is cemented with the seventh lens, the ninth lens is cemented with the tenth lens, and the following are satisfied: vd7-vd6 > 20 and vd9-vd10 > 20, wherein vd6, vd7, vd9 and vd10 are the abbe numbers of the sixth, seventh, ninth and tenth lenses, respectively, further achromatizing, optimizing the visible and infrared confocal properties.
Preferably, the third lens and the fourth lens are cemented with each other, the sixth lens and the seventh lens are cemented with each other, and the following are satisfied: 0.7< |R34/R67| <1.25, wherein R34 is the curvature radius of the bonding surface of the third lens and the fourth lens, and R67 is the curvature radius of the bonding surface of the sixth lens and the seventh lens, so as to further optimize the temperature drift.
Preferably, the optical imaging lens further satisfies: and f1/f8 is more than 0.7 and less than 1.5, wherein f1 and f8 are 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 focal lengths of the fourth lens and the sixth lens respectively, and the temperature drift is further optimized.
Preferably, the optical imaging lens further satisfies: vd2 > 50 and vd8 > 50, wherein vd2 and vd8 are the abbe numbers of the second and eighth lenses, respectively, and further achromat to optimize the visible and infrared confocal properties.
Preferably, the optical imaging lens further satisfies: 1< |R12/R11| <2.5, wherein R11 and R12 are the curvature radiuses 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, and the temperature drift is further optimized.
Preferably, the refractive index temperature coefficient of the eighth lens is negative, so as to balance the temperature drift.
Preferably, the optical imaging lens further satisfies: 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 indexes of the first lens, the second lens, the fifth lens and the eighth lens respectively, so that better visible and infrared confocal can be realized, and the system performance is optimized.
Preferably, the lens assembly further comprises a diaphragm, wherein 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 with specific examples.
Example 1
As shown in fig. 1, an optical imaging lens for both day and night use includes, in order along an optical axis I from an object side A1 to an image side A2, 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 imaging plane 120, wherein each of the first lens 1 to the tenth lens 100 includes an object side surface facing the object side A1 and passing imaging light and an image side surface facing the image side A2 and passing imaging light.
The first lens element 1 has a positive refractive power, wherein an object-side surface 11 of the first lens element 1 is convex, and an image-side surface 12 of the first lens element 1 is concave.
The second lens element 2 has a negative refractive power, wherein 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 power, wherein 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 power, wherein an object-side surface 41 of the fourth lens element 4 is convex, and an image-side surface 42 of the fourth lens element 4 is convex.
The fifth lens element 5 has a positive refractive power, wherein 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 power, wherein 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 positive refractive power, wherein 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 has a positive refractive power, the object-side surface 81 of the eighth lens element 8 is convex, and the image-side surface 82 of the eighth lens element 8 is convex, however, in other embodiments, the image-side surface 82 of the eighth lens element 8 can be planar or concave.
The ninth lens element 9 has a positive refractive power, wherein an object-side surface 91 of the ninth lens element 9 is convex, and an image-side surface 92 of the ninth lens element 9 is convex.
The tenth lens element 100 has a negative refractive power, the object-side surface 101 of the tenth lens element 100 is concave, and the 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 is cemented with the object side surface 41 of the fourth lens element 4, the image side surface 62 of the sixth lens element 6 is cemented with the object side surface 71 of the seventh lens element 7, the image side surface 92 of the ninth lens element 9 is cemented with the object side surface 101 of the tenth lens element 100, and three cemented lens elements are used to obtain better confocal performance between the visible light and the infrared light, however, 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, it is also possible that the third lens 3 and the fourth lens 4 are glued to each other and the sixth lens 6 and the seventh lens 7 are glued to 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 refractive index temperature coefficient dn/dt of the eighth lens 8 is a negative value.
Of course, in some embodiments, the aperture 110 may also be disposed between other lenses.
The detailed optical data of this particular example are shown in Table 1-1.
Table 1-1 detailed optical data for example one
| Surface of the body | Radius of curvature (mm) | Thickness/spacing (mm) | Material of material | Refractive index | Coefficient of dispersion | Focal length (mm) | |
| - | Object plane | 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 | 56.167 | 6.22 | Glass | 1.948 | 17.94 | 32.8 |
| 52 | -67.848 | 1.64 | |||||
| 110 | Diaphragm | Infinity | 4.29 | ||||
| 61 | Sixth lens | -39.231 | 1.97 | Glass | 1.639 | 34.48 | -20.1 |
| 62 | 19.693 | 0 | |||||
| 71 | Seventh lens | 19.693 | 10.72 | Glass | 1.607 | 56.65 | 21.5 |
| 72 | -31.458 | 0.254 | |||||
| 81 | Eighth lens | 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 | Imaging surface | Infinity |
The numerical values of the related conditional expressions of this embodiment are shown in fig. 25.
Referring to fig. 2 and 3, it can be seen that the visible light and infrared confocal performance of the embodiment is good, and the defocus amount is 9 μm when the visible light and infrared are converted; 4-6, it can be seen from the figure that the transfer function is well controlled, the resolution is high, the spatial frequency can reach 145lp/mm, the image quality requirement of more than 12M is met, and the high and low temperature is hardly out of focus.
In this embodiment, the focal length f=50 mm, the aperture value fno=1.5, the image plane diameter Φ=22 mm, the distance ttl=106 mm between the object side surface 11 of the first lens element 1 and the imaging plane 140 on the optical axis I, and the field angle fov=26.2°.
Example two
As shown in fig. 7, in this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data of this particular example are shown in Table 2-1.
Table 2-1 detailed optical data for example two
The numerical values of the related conditional expressions of this embodiment are shown in fig. 25.
Referring to fig. 8 and 9, it can be seen that the visible light and infrared confocal performance of the embodiment is good, and the defocus amount is 10 μm when the visible light and infrared are converted; with reference to fig. 10-12, it can be seen from the figure that the transfer function is well controlled, the resolution is high, the spatial frequency can reach 145lp/mm, the image quality requirement of more than 12M is met, and the high and low temperature is hardly out of focus.
In this embodiment, the focal length f=49.5 mm, the aperture value fno=1.5, the image plane diameter Φ=22.5 mm, the distance ttl=113 mm between the object side surface 11 of the first lens 1 and the imaging plane 140 on the optical axis I, and the field angle fov=26.0°.
Example III
As shown in fig. 13, in this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data of this particular example are shown in Table 3-1.
Table 3-1 detailed optical data for example three
The numerical values of the related conditional expressions of this embodiment are shown in fig. 25.
Referring to fig. 14 and 15, it can be seen that the visible light and infrared confocal performance of the present embodiment is good, and the defocus amount is 10 μm when the visible light and infrared are converted; with reference to fig. 16-18, it can be seen from the figure that the transfer function is well controlled, the resolution is high, the spatial frequency can reach 145lp/mm, the image quality requirement of more than 12M is met, and the high and low temperature is hardly out of focus.
In this embodiment, the focal length f=50 mm, the aperture value fno=1.5, the image plane diameter Φ=22.5 mm, the distance ttl=115 mm between the object side surface 11 of the first lens element 1 and the imaging plane 140 on the optical axis I, and the field angle fov=26.2°.
Example IV
As shown in fig. 19, in this embodiment, the surface irregularities and refractive index of each lens are substantially the same as those of the first embodiment, and only the image side surface 82 of the eighth lens 8 is concave, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data of this particular example are shown in Table 4-1.
Table 4-1 detailed optical data for example four
The numerical values of the related conditional expressions of this embodiment are shown in fig. 25.
Referring to fig. 20 and 21, it can be seen that the visible light and infrared confocal performance of the embodiment is good, and the defocus amount is 10 μm when the visible light and infrared are converted; with reference to fig. 22-24, it can be seen from the figure that the transfer function is well controlled, the resolution is high, the spatial frequency can reach 145lp/mm, the image quality requirement of more than 12M is met, and the high and low temperature is hardly out of focus.
In this embodiment, the focal length f=50 mm, the aperture value fno=1.5, the image plane diameter Φ=22.6 mm, the distance ttl=103 mm between the object side surface 11 of the first lens element 1 and the imaging plane 140 on the optical axis I, and the field angle fov=26.0°.
The invention is applicable to the use in the temperature range of-40 ℃ to 70 ℃ and can ensure that the picture is clear and does not lose 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 details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. An optical imaging lens for day and night use, which is characterized in that: in order from the object side to the image side along an optical axis comprises a first lens to a tenth lens; the first lens element to the tenth lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has positive refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
The third lens has negative refractive index, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
The fifth lens has positive refractive index, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative refractive power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface;
the seventh lens has positive refractive index, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface;
the eighth lens has positive refractive index, and the object side surface of the eighth lens is a convex surface;
the ninth lens has positive refractive index, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface;
the tenth lens has negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface of the tenth lens is a concave surface;
the third lens and the fourth lens are glued mutually and/or the sixth lens and the seventh lens are glued mutually and/or the ninth lens and the tenth lens are glued mutually;
the optical imaging lens has only ten lenses with refractive index;
The optical imaging lens satisfies the following conditions: 0.7 < f1/f8 < 1.5,0.7 < |f4/f6| < 1.5, vd2 > 50, vd8 > 50, wherein f1 and f8 are focal lengths of the first and eighth lenses, respectively, f4 and f6 are focal lengths of the fourth and sixth lenses, respectively, and vd2 and vd8 are abbe numbers of the second and eighth lenses, respectively.
2. The day and night optical imaging lens according to claim 1, wherein: the sixth lens is glued to the seventh lens, the ninth lens is glued to the tenth lens, and the following conditions are satisfied: vd7-vd6 > 20, vd9-vd10 > 20, wherein vd6, vd7, vd9 and vd10 are the abbe numbers of the sixth, seventh, ninth and tenth lenses, respectively.
3. The day and night optical imaging lens according to claim 1, wherein: 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 satisfied: 0.7< |R34/R67| <1.25, wherein R34 is the curvature radius of the bonding surface of the third lens and the fourth lens, and R67 is the curvature radius of the bonding surface of the sixth lens and the seventh lens.
4. The day and night optical imaging lens according to claim 1, wherein the optical imaging lens further satisfies: 1< |r12/r11| <2.5, wherein R11 and R12 are radii of curvature of an object side surface and an image side surface of the first lens, respectively.
5. The day and night optical imaging lens according to claim 1, wherein the optical imaging lens further satisfies: 0.7< |r51/r81| <1.25, wherein R51 and R81 are radii of curvature of the object side surfaces of the fifth lens and the eighth lens, respectively.
6. The day and night optical imaging lens according to claim 1, wherein: the refractive index temperature coefficient of the eighth lens is a negative value.
7. The day and night optical imaging lens according to claim 1, wherein the optical imaging lens further satisfies: 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, second, fifth, and eighth lenses, respectively.
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| JP5930088B1 (en) * | 2015-02-18 | 2016-06-08 | セイコーエプソン株式会社 | Projection optical system |
| KR102620545B1 (en) * | 2016-04-06 | 2024-01-03 | 삼성전기주식회사 | Optical Imaging System |
| CN106970466B (en) * | 2017-01-11 | 2019-09-17 | 玉晶光电(厦门)有限公司 | Eyepiece optical system |
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