CN111142235A - Large-light-transmission day and night dual-purpose optical imaging lens - Google Patents
Large-light-transmission day and night dual-purpose optical imaging lens Download PDFInfo
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- 238000003384 imaging method Methods 0.000 claims abstract description 11
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- G—PHYSICS
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- 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
- 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
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Abstract
The invention relates to the technical field of lenses. The invention discloses a large-light-transmission day-night dual-purpose optical imaging lens which comprises eleven lenses, wherein the first lens and the eleventh lens are convex-concave lenses with positive refractive indexes; the second lens is a convex-concave lens with negative refractive index; the third, seventh and tenth lens elements are concave-concave lenses with negative refractive index; the fourth, fifth, sixth, eighth and ninth lenses are convex lenses with positive refractive index. 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 large-light-transmission day and night 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 the 12mm focal length section of the intelligent traffic system is small, and is generally 1/1.7 inch to 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 with large light transmission for day and night use, which is used for solving the technical problems.
In order to achieve the purpose, the invention adopts the technical scheme that: an optical imaging lens with large light transmission for day and night comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis; the first lens element to the eleventh 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 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 positive refractive index has a convex object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the eighth lens element with positive refractive power has a convex object-side surface and a convex image-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 eleventh lens element with positive refractive power has a convex object-side surface and a concave image-side surface;
the optical imaging lens has only eleven lenses with the refractive index.
Further, the optical imaging lens further satisfies the following conditions: 0.7 < | f2/f4 | < 1.5, wherein f2 and f4 are focal lengths of the second lens element and the fourth lens element, respectively.
Further, the optical imaging lens further satisfies the following conditions: 0.7 < | f3/f9 | < 1.5, wherein f3 and f9 are focal lengths of the third lens element and the ninth lens element, respectively.
Further, the optical imaging lens further satisfies the following conditions: vd1 > 50, vd2 > 50, vd8 > 50, vd11 > 50, wherein vd1, vd2, vd8 and vd11 are the abbe numbers of the first lens, the second lens, the eighth lens and the eleventh lens, respectively.
Further, the optical imaging lens further satisfies the following conditions: nd4 is more than 1.8, wherein nd4 is the refractive index of the fourth lens.
Further, the image side surface of the sixth lens and the object side surface of the seventh lens are mutually cemented, and vd6-vd7 > 30 is satisfied, wherein vd6 and vd7 are the dispersion coefficients of the sixth lens and the seventh lens, respectively.
Further, the optical imaging lens further satisfies the following conditions: 5< | R12/R11| <8, 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: 0.8< | R61/R81| <1.25, 0.8< | R22/R102| <1.25, wherein R22 is a radius of curvature of an image-side surface of the second lens, R61 is a radius of curvature of an object-side surface of the sixth lens, R81 is a radius of curvature of an object-side surface of the eighth lens, and R102 is a radius of curvature of an image-side surface of the tenth lens.
Further, the optical imaging lens further satisfies the following conditions: vd6>80, wherein vd6 is the abbe number of the sixth lens, and the temperature coefficient of refractive index of the sixth lens is negative.
Further, the optical imaging lens further satisfies the following conditions: 1.5< nd1<1.8, 1.5< nd2<1.8, 1.8< nd3<2.05, 1.5< nd5<1.8, 1.5< nd8<1.8, wherein nd1, nd2, nd3, nd5 and nd8 are refractive indices of the first lens, the second lens, the third lens, the fifth lens and the eighth lens, respectively.
The invention has the beneficial technical effects that:
the invention adopts eleven lenses, and has a sensor with a large image surface and capable of supporting 1.1 inch through the arrangement design of the refractive index and the surface type of each lens; the resolution is high, and 10M-12M 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 0.490-0.625 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 at 0.490-0.625 μm at room temperature (20 ℃ C.) in accordance with an embodiment of the present invention;
FIG. 5 is a graph of MTF at 0.490-0.625 μm at a high temperature (70 ℃ C.) in accordance with an embodiment of the present invention;
FIG. 6 is a graph of MTF at 0.490-0.625 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 0.490-0.625 μm at room temperature (20 ℃ C.) in accordance with example of the present invention;
FIG. 11 is a graph of MTF at 0.490-0.625 μm at high temperature (70 ℃ C.) according to example two of the present invention;
FIG. 12 is a graph of MTF at 0.490-0.625 μm at low temperature (-30 ℃ C.) according to 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 0.490-0.625 μm at three temperatures (20 ℃ C.) for the examples of the present invention;
FIG. 17 is a graph of MTF at three temperatures (70 ℃) of 0.490-0.625 μm in accordance with an embodiment of the present invention;
FIG. 18 is a graph of MTF at low temperature (-30 ℃) of 0.490-0.625 μm 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 0.490-0.625 μm at four normal temperatures (20 ℃ C.) for the examples of the present invention;
FIG. 23 is a graph of MTF at 0.490-0.625 μm at four high temperatures (70 ℃ C.) for examples of the present invention;
FIG. 24 is a graph of MTF at low temperature (-30 ℃) of 0.490-0.625 μm in accordance with 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 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 a large-light-transmission 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 eleventh 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 positive refractive power has a convex object-side surface and a convex image-side surface.
The seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The eighth lens element with positive refractive power has a convex object-side surface and a convex image-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 eleventh lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the optical imaging lens has only eleven lenses with the refractive index.
The invention adopts eleven lenses, and has a sensor with a large image surface and capable of supporting 1.1 inch through the arrangement design of the refractive index and the surface type of each lens; the resolution is high, and 10M-12M 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; switching to an infrared mode under visible focusing, and realizing clear night vision; the total length is shorter.
Preferably, the optical imaging lens further satisfies: 0.7 < | f2/f4 | < 1.5, wherein f2 and f4 are the focal lengths of the second lens and the fourth lens, respectively, to further optimize the temperature drift.
Preferably, the optical imaging lens further satisfies: 0.7 < | f3/f9 | < 1.5, wherein f3 and f9 are the focal lengths of the third lens and the ninth lens, respectively, to further optimize the temperature drift.
Preferably, the optical imaging lens further satisfies: vd1 > 50, vd2 > 50, vd8 > 50 and vd11 > 50, wherein vd1, vd2, vd8 and vd11 are the dispersion coefficients of the first lens, the second lens, the eighth lens and the eleventh lens respectively, and further optimize chromatic aberration and day and night confocality.
Preferably, the optical imaging lens further satisfies: nd4 is more than 1.8, wherein nd4 is the refractive index of the fourth lens, the resolving power is further optimized, and the imaging quality is improved.
Preferably, the image side surface of the sixth lens and the object side surface of the seventh lens are mutually cemented, and vd6-vd7 > 30 is satisfied, wherein vd6 and vd7 are the dispersion coefficients of the sixth lens and the seventh lens, respectively, and further the chromatic aberration and day and night confocality are optimized.
Preferably, the optical imaging lens further satisfies: 5< | R12/R11| <8, 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: 0.8< | R61/R81| <1.25, 0.8< | R22/R102| <1.25, wherein R22 is the radius of curvature of the image-side surface of the second lens, R61 is the radius of curvature of the object-side surface of the sixth lens, R81 is the radius of curvature of the object-side surface of the eighth lens, and R102 is the radius of curvature of the image-side surface of the tenth lens, further optimizing the temperature drift.
Preferably, the optical imaging lens further satisfies: vd6>80, wherein vd6 is the abbe number of the sixth lens, and the temperature coefficient of refractive index of the sixth lens is negative to balance the temperature drift.
Preferably, the optical imaging lens further satisfies: 1.5< nd1<1.8, 1.5< nd2<1.8, 1.8< nd3<2.05, 1.5< nd5<1.8 and 1.5< nd8<1.8, wherein nd1, nd2, nd3, nd5 and nd8 are refractive indexes of the first lens, the second lens, the third lens, the fifth lens and the eighth lens respectively, so that good visible and infrared confocal performance can be realized, and the system performance is optimized.
Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the fourth lens and the fifth 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 with large light transmission 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 stop 120, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 100, an eleventh lens 110, a protective sheet 130, and an image forming surface 140 from an object side a1 to an image side a 2; the first lens element 1 to the eleventh lens element 110 each include an object-side surface facing the object side a1 and passing the image light, and an image-side surface facing the image side a2 and passing the image light.
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 with positive refractive index has a convex object-side surface 61 of the sixth lens element 6 and a convex image-side surface 62 of the sixth lens element 6.
The seventh lens element 7 has a negative refractive index, and an object-side surface 71 of the seventh lens element 7 is concave and an image-side surface 72 of the seventh lens element 7 is concave.
The eighth lens element 8 has a positive refractive index, and an object-side surface 81 of the eighth lens element 8 is convex and an image-side surface 82 of the eighth lens element 8 is convex.
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 with negative refractive index has a concave object-side surface 101 of the tenth lens element 100 and a concave image-side surface 102 of the tenth lens element 100.
The eleventh lens element 110 has a positive refractive index, and an object-side surface 111 of the eleventh lens element 110 is convex and an image-side surface 112 of the eleventh lens element 110 is concave.
In this embodiment, 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 to each other.
In this embodiment, the temperature coefficient of refractive index dn/dt of the sixth lens element 6 is negative.
Of course, in some embodiments, the stop 120 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
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 during the visible light and the infrared light switching is 8 μm; referring to fig. 4-6, it can be seen that the image quality requirement of 10-12M is satisfied, and almost no defocus occurs at high and low temperatures, because the transfer function is well controlled and the resolution is high, and the MTF value of the spatial frequency of 150lp/mm is greater than 0.2.
In this embodiment, the focal length f of the optical imaging lens is 12.3mm, the aperture value FNO is 1.4, the image plane diameter Φ is 17.2mm, the distance TTL between the object-side surface 11 of the first lens 1 and the imaging surface 140 on the optical axis I is 98.7mm, and the field angle FOV is 70 °.
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 8 μm; please refer to fig. 10-12, it can be seen that the image resolution is good for the transfer function control, the resolution is high, the MTF value of the spatial frequency 150lp/mm is greater than 0.2 when in use, the image quality requirement of 10-12M is satisfied, and the high and low temperature hardly defocus.
In this embodiment, the focal length f of the optical imaging lens is 12.2mm, the aperture value FNO is 1.4, the image plane diameter Φ is 17.2mm, 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 99.2mm, and the field angle FOV is 70 °.
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 6 μm; referring to fig. 16-18, it can be seen that the image quality requirement of 10-12M is satisfied, and almost no defocus occurs at high and low temperatures, because the transfer function is well controlled and the resolution is high, and the MTF value of the spatial frequency of 150lp/mm is greater than 0.2.
In this embodiment, the focal length f of the optical imaging lens is 12.5mm, the aperture value FNO is 1.4, the image plane diameter Φ is 17.5mm, 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 98.1mm, and the field angle FOV is 70 °.
Example four
As shown in fig. 19, 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 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 9 μm; please refer to fig. 22-24, it can be seen that the image quality is well controlled for the transfer function, the resolution is high, the MTF value of the spatial frequency of 150lp/mm is greater than 0.2, the image quality requirement of 10-12M is satisfied, and the high and low temperature hardly defocus.
In this embodiment, the focal length f of the optical imaging lens is 12.2mm, the aperture value FNO is 1.4, the image plane diameter Φ is 17.0mm, 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 100.0mm, and the field angle FOV is 70 °.
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. The utility model provides a dual-purpose optical imaging lens of day night of big light-passing which characterized in that: the optical lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along an optical axis; the first lens element to the eleventh 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 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 positive refractive index has a convex object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the eighth lens element with positive refractive power has a convex object-side surface and a convex image-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 eleventh lens element with positive refractive power has a convex object-side surface and a concave image-side surface;
the optical imaging lens has only eleven lenses with the refractive index.
2. A large-pass optical imaging lens for day and night use according to claim 1, wherein the optical imaging lens further satisfies: 0.7 < | f2/f4 | < 1.5, wherein f2 and f4 are focal lengths of the second lens element and the fourth lens element, respectively.
3. A large-pass optical imaging lens for day and night use according to claim 1, wherein the optical imaging lens further satisfies: 0.7 < | f3/f9 | < 1.5, wherein f3 and f9 are focal lengths of the third lens element and the ninth lens element, respectively.
4. A large-pass optical imaging lens for day and night use according to claim 1, wherein the optical imaging lens further satisfies: vd1 > 50, vd2 > 50, vd8 > 50, vd11 > 50, wherein vd1, vd2, vd8 and vd11 are the abbe numbers of the first lens, the second lens, the eighth lens and the eleventh lens, respectively.
5. A large-pass optical imaging lens for day and night use according to claim 1, wherein the optical imaging lens further satisfies: nd4 is more than 1.8, wherein nd4 is the refractive index of the fourth lens.
6. A large-pass day-night optical imaging lens as claimed in claim 1, characterized in that: the image side surface of the sixth lens and the object side surface of the seventh lens are mutually cemented, and vd6-vd7 > 30 is satisfied, wherein vd6 and vd7 are the dispersion coefficients of the sixth lens and the seventh lens respectively.
7. A large-pass optical imaging lens for day and night use according to claim 1, wherein the optical imaging lens further satisfies: 5< | R12/R11| <8, wherein R11 and R12 are radii of curvature of the object-side surface and the image-side surface of the first lens, respectively.
8. A large-pass optical imaging lens for day and night use according to claim 1, wherein the optical imaging lens further satisfies: 0.8< | R61/R81| <1.25, 0.8< | R22/R102| <1.25, wherein R22 is a radius of curvature of an image-side surface of the second lens, R61 is a radius of curvature of an object-side surface of the sixth lens, R81 is a radius of curvature of an object-side surface of the eighth lens, and R102 is a radius of curvature of an image-side surface of the tenth lens.
9. A large-pass optical imaging lens for day and night use according to claim 1, wherein the optical imaging lens further satisfies: vd6>80, wherein vd6 is the abbe number of the sixth lens, and the temperature coefficient of refractive index of the sixth lens is negative.
10. A large-pass optical imaging lens for day and night use according to claim 1, wherein the optical imaging lens further satisfies: 1.5< nd1<1.8, 1.5< nd2<1.8, 1.8< nd3<2.05, 1.5< nd5<1.8, 1.5< nd8<1.8, wherein nd1, nd2, nd3, nd5 and nd8 are refractive indices of the first lens, the second lens, the third lens, the fifth lens and the eighth lens, respectively.
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