CN211955960U - Optical imaging lens with fixed focus and low chromatic aberration - Google Patents
Optical imaging lens with fixed focus and low chromatic aberration Download PDFInfo
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- CN211955960U CN211955960U CN202020859961.9U CN202020859961U CN211955960U CN 211955960 U CN211955960 U CN 211955960U CN 202020859961 U CN202020859961 U CN 202020859961U CN 211955960 U CN211955960 U CN 211955960U
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Abstract
The utility model relates to a camera lens technical field. The utility model discloses a fixed-focus low-chromatic aberration optical imaging lens, which sequentially comprises a first lens, a second lens and a third lens from an object side to an image side along an optical axis; the first lens is a convex-concave lens with positive refraction; the second lens, the fifth lens and the sixth lens are convex lenses with positive refraction; the third lens and the fourth lens are concave lenses with negative refraction; the second lens and the third lens are mutually glued, and the fourth lens and the fifth lens are mutually glued. The utility model has the advantages of high resolution, small distortion, small chromatic aberration and aberration, small temperature drift and good low-light characteristic.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to an optical imaging camera lens of low colour difference of tight shot.
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 the optical imaging lenses are widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring, unmanned aerial vehicle aerial photography and the like, so that the requirements on the optical imaging lenses are higher and higher.
However, the existing common optical imaging lens has many defects, such as poor resolving power, low resolution, poor day and night confocality, and can not meet the use requirement at night; the distortion is large, generally the distortion is larger than 3%, and the image restoration is not accurate; chromatic aberration and aberration are large, and poor image quality and color restoration are affected; working in high and low temperature environment, the defocusing is easily caused, the image quality is reduced, and the use is influenced; low light characteristics are not good, a clear color image or the like cannot be realized in the case of poor light, and thus, it is necessary to improve it to meet the increasing demands of consumers.
Disclosure of Invention
An object of the utility model is to provide an optical imaging lens of low colour difference of tight shot is used for solving the technical problem that above-mentioned exists.
In order to achieve the above object, the utility model adopts the following technical scheme: an optical imaging lens with fixed focus and low chromatic aberration sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a fourth lens from an object side to an image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through;
the first lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with positive refractive index has a convex object-side surface and a convex 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 negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the second lens and the third lens are mutually glued, and the fourth lens and the fifth lens are mutually glued;
the optical imaging lens has only the first lens to the sixth lens with the refractive index.
Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.
Further, the first lens is made of lanthanum flint glass.
Further, the optical imaging lens further satisfies: 1< | f2/f3 | 2, wherein f2 is the focal length of the second lens and f3 is the focal length of the third lens.
Further, the optical imaging lens further satisfies: vd2 is more than or equal to 68, vd3 is less than or equal to 46, and vd2-vd3 is more than 22, wherein vd2 is the dispersion coefficient of the second lens, and vd3 is the dispersion coefficient of the third lens.
Further, the optical imaging lens further satisfies: vd4 is less than or equal to 29, vd5 is more than or equal to 68, and vd5-vd4 is more than 29, wherein vd4 is the dispersion coefficient of the fourth lens, and vd5 is the dispersion coefficient of the fifth lens.
Further, the optical imaging lens further satisfies: nd6 is more than 1.9, wherein nd6 is the refractive index of the sixth lens.
Further, the temperature coefficient of relative refractive index dn/dt of the second lens and the sixth lens is negative.
Further, the optical imaging lens further satisfies: ALT <11mm, ALG <9mm, ALT/ALG <1.5, wherein ALG is the sum of air gaps from the first lens to the imaging surface on the optical axis, and ALT is the sum of six lens thicknesses from the first lens to the sixth lens on the optical axis.
The utility model has the advantages of:
the utility model adopts six lenses, and by correspondingly designing each lens, the resolution ratio is high, the day and night confocal is good, and high definition image quality can be realized both at day and night; distortion is small, linear distribution is achieved, and the image is almost free of deformation; the image surface is larger; chromatic aberration and aberration are small, and color reducibility is good; when the device works in a high-temperature and low-temperature environment, the temperature drift amount is small, and the device is not easy to lose coke; high contrast, and clear color image under poor light.
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 described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a graph of the MTF of the visible light 435-;
fig. 3 is a schematic view of curvature of field and distortion according to the first embodiment of the present invention;
fig. 4 is a schematic view of a vertical axis chromatic aberration curve according to a first embodiment of the present invention;
fig. 5 is a schematic view of a vertical axis aberration curve according to a first embodiment of the present invention;
fig. 6 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 7 is a graph of the MTF of visible light 435-656nm according to the second embodiment of the present invention;
fig. 8 is a graphical illustration of curvature of field and distortion of a second embodiment of the present invention;
fig. 9 is a schematic view of a vertical axis chromatic aberration curve according to a second embodiment of the present invention;
fig. 10 is a schematic view of a vertical axis aberration curve according to a second embodiment of the present invention;
fig. 11 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 12 is the MTF graph of visible light 435-;
fig. 13 is a schematic view of curvature of field and distortion in a third embodiment of the present invention;
fig. 14 is a schematic view of a vertical axis chromatic aberration curve according to a third embodiment of the present invention;
fig. 15 is a schematic view of a vertical axis aberration curve according to a third embodiment of the present invention;
Detailed Description
To further illustrate the embodiments, the present 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. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element 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 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 utility model discloses a fixed-focus low-chromatic aberration optical imaging lens, which sequentially comprises a first lens, a second lens and a third lens from an object side to an image side along an optical axis; the first lens element to the sixth lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.
The first lens element with positive refractive index has a convex object-side surface and a concave image-side surface; the first lens adopts a crescent lens, and can correct distortion.
The second lens element with positive refractive index has a convex object-side surface and a convex 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 negative refractive index has a concave object-side surface and a concave image-side surface.
The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The second lens and the third lens are mutually glued, and the fourth lens and the fifth lens are mutually glued.
The optical imaging lens has only the first lens to the sixth lens with the refractive index.
The utility model adopts six lenses, and by correspondingly designing each lens, the resolution ratio is high, the day and night confocal is good, and high definition image quality can be realized both at day and night; distortion is small, linear distribution is achieved, and the image is almost free of deformation; the image surface is larger; chromatic aberration and aberration are small, and color reducibility is good; when the coke oven works in a high-temperature and low-temperature environment, the temperature drift amount is small, and the coke is not easy to lose; high contrast, and clear color image under poor light.
Preferably, the optical system further comprises a diaphragm, the diaphragm is arranged between the third lens and the fourth lens, a double-Gaussian symmetrical structure is adopted, aberration can be corrected well, and particularly in a large-pass lens, the coma correcting effect is obvious; the second lens and the third lens are symmetrical with the fourth lens and the fifth lens about the diaphragm, so that coma can be further corrected, and the resolution is improved.
Preferably, the first lens is made of lanthanum flint glass, so that aberration can be further corrected, and image quality is improved.
Preferably, the optical imaging lens further satisfies: 1< | f2/f3 | 2, wherein f2 is the focal length of the second lens element, and f3 is the focal length of the third lens element, further correcting distortion and improving the resolution of the lens.
Preferably, the optical imaging lens further satisfies: vd2 is more than or equal to 68, vd3 is less than or equal to 46, and vd2-vd3 is more than 22, wherein vd2 is the dispersion coefficient of the second lens, vd3 is the dispersion coefficient of the third lens, and high-low dispersion materials are combined to control chromatic aberration, optimize image quality and improve system performance.
Preferably, the optical imaging lens further satisfies: vd4 is less than or equal to 29, vd5 is more than or equal to 68, and vd5-vd4 is more than 29, wherein vd4 is the dispersion coefficient of the fourth lens, vd5 is the dispersion coefficient of the fifth lens, and high-low dispersion materials are combined to effectively control chromatic aberration, so that day and night confocal property is realized, and high-definition image quality can be realized both at day and night.
Preferably, the optical imaging lens further satisfies: nd6 is more than 1.9, wherein nd6 is the refractive index of the sixth lens, so that the aberration is further optimized, and high resolution is realized.
Preferably, the temperature coefficient dn/dt of the relative refractive index of the second lens and the sixth lens is a negative value, so that the temperature drift of the optical system is controlled to be better matched with the structural part and the camera.
Preferably, the optical imaging lens further satisfies: ALT <11mm, ALG <9mm, and ALT/ALG <1.5, wherein ALG is the sum of air gaps between the first lens and the imaging surface on the optical axis, and ALT is the sum of the thicknesses of the six lenses between the first lens and the sixth lens on the optical axis, the system length of the optical imaging lens is further shortened, and the optical imaging lens is easy to process and manufacture, and the system configuration is optimized.
The following describes the optical imaging lens with fixed focus and low chromatic aberration in detail with specific embodiments.
Example one
As shown in fig. 1, an optical imaging lens with fixed focus and low chromatic aberration includes, in order from an object side a1 to an image side a2 along an optical axis I, a first lens 1, a second lens 2, a third lens 3, a stop 7, a fourth lens 4, a fifth lens 5, a sixth lens 6, an optical filter 8, a protective sheet 9, and an image plane 100; the first lens element 1 to the sixth lens element 6 each include an object-side surface facing the object side a1 and passing the imaging light rays, and an image-side surface facing the image side a2 and passing the imaging light rays.
The first lens element 1 has a positive refractive index, and 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 positive refractive index, and an object-side surface 21 of the second lens element 2 is convex and an image-side surface 22 of the second lens element 2 is convex.
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 negative refractive index, and an object-side surface 41 of the fourth lens element 4 is concave and an image-side surface 42 of the fourth lens element 4 is concave.
The fifth lens element 5 has a positive refractive index, and an object-side surface 51 of the fifth lens element 5 is convex and an image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 has a positive refractive index, and an object-side surface 61 of the sixth lens element 6 is convex and an image-side surface 62 of the sixth lens element 6 is convex.
The second lens 2 and the third lens 3 are cemented with each other, and the fourth lens 4 and the fifth lens 5 are cemented with each other.
In this embodiment, the temperature coefficient of relative refractive index dn/dt of the second lens 2 and the sixth lens 6 is negative.
The filter 8 may be an infrared filter, and may be specifically set according to actual needs.
In other embodiments, the diaphragm 7 may be disposed at other suitable positions.
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 table 4 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 2, and it can be seen that the resolution is high and can reach 150lp/mm > 0.3; and the confocal good of day night of this specific embodiment, daytime and night all can realize high definition picture quality.
Referring to (A) and (B) of FIG. 3, it can be seen that the field curvature and distortion are small, the distortion amount DIS is less than-0.6%, and the image is linearly distributed and almost has no deformation.
The vertical axis chromatic aberration and the vertical axis aberration diagram are shown in detail in figures 4 and 5, and it can be seen that the aberration and the chromatic aberration are small, and the color reducibility is good.
The aperture value FNO is 1.8, the relative illumination can be greater than 70%, and a clear color image can be realized even in the case of poor light.
In addition, when the optical imaging lens of the embodiment works in high and low temperature environments, the temperature drift amount is small, and the optical imaging lens is not easy to be out of focus.
In this embodiment, the focal length f of the optical imaging lens is 12 mm; field angle FOV is 23.5 °; the diameter phi of the image plane is 5 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 19.16 mm.
Example two
As shown in fig. 6, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
Please refer to table 4 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 7, and it can be seen that the resolution is high and can reach 150lp/mm > 0.3; and the confocal good of day night of this specific embodiment, daytime and night all can realize high definition picture quality.
Referring to (a) and (B) of fig. 8, it can be seen that the field curvature and distortion are small, the distortion amount DIS is less than-0.6%, and the image is linearly distributed and almost has no distortion.
The vertical axis chromatic aberration and the vertical axis aberration diagram are shown in detail in FIGS. 9 and 10, and it can be seen that the aberration and the chromatic aberration are small and the color reducibility is good.
The aperture value FNO is 1.8, the relative illumination can be greater than 70%, and a clear color image can be realized even in the case of poor light.
In addition, when the optical imaging lens of the embodiment works in high and low temperature environments, the temperature drift amount is small, and the optical imaging lens is not easy to be out of focus.
In this embodiment, the focal length f of the optical imaging lens is 12 mm; field angle FOV is 23.5 °; the diameter phi of the image plane is 5 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 19.17 mm.
EXAMPLE III
As shown in fig. 11, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element 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 table 4 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 12, and it can be seen that the resolution is high and can reach 150lp/mm > 0.3; and the confocal good of day night of this specific embodiment, daytime and night all can realize high definition picture quality.
Referring to (a) and (B) of fig. 13, it can be seen that the field curvature and distortion are small, the distortion amount DIS is less than-0.6%, and the image has almost no distortion.
The vertical axis chromatic aberration and the vertical axis aberration diagram are shown in figures 14 and 15 in detail, and it can be seen that the aberration and the chromatic aberration are small, and the color reducibility is good.
The aperture value FNO is 1.8, the relative illumination can be greater than 70%, and a clear color image can be realized even in the case of poor light.
In addition, when the optical imaging lens of the embodiment works in high and low temperature environments, the temperature drift amount is small, and the optical imaging lens is not easy to be out of focus.
In this embodiment, the focal length f of the optical imaging lens is 12 mm; field angle FOV is 23.5 °; the diameter phi of the image plane is 5 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 19.18 mm.
Table 4 values of relevant important parameters of three embodiments of the present invention
| Example one | Example two | EXAMPLE III | |
| ∣f2/f3∣ | 1.48 | 1.46 | 1.46 |
| vd2-vd3 | 22.51 | 22.51 | 22.51 |
| vd5-vd4 | 40.05 | 40.05 | 40.58 |
| ALT | 9.82 | 9.84 | 9.80 |
| ALG | 8.54 | 8.53 | 8.58 |
| ALT/ALG | 1.15 | 1.15 | 1.14 |
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 (9)
1. The utility model provides an optical imaging lens of low colour difference of tight shot which 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, the second lens, the third lens and the fourth lens are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through;
the first lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with positive refractive index has a convex object-side surface and a convex 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 negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the second lens and the third lens are mutually glued, and the fourth lens and the fifth lens are mutually glued;
the optical imaging lens has only the first lens to the sixth lens with the refractive index.
2. The fixed-focus low-chromatic-aberration optical imaging lens according to claim 1, characterized in that: the diaphragm is arranged between the third lens and the fourth lens.
3. The fixed-focus low-chromatic-aberration optical imaging lens according to claim 1, characterized in that: the first lens is made of lanthanum flint glass.
4. The fixed-focus low-chromatic-aberration optical imaging lens according to claim 1, further satisfying: 1< | f2/f3 | 2, wherein f2 is the focal length of the second lens and f3 is the focal length of the third lens.
5. The fixed-focus low-chromatic-aberration optical imaging lens according to claim 1, further satisfying: vd2 is more than or equal to 68, vd3 is less than or equal to 46, and vd2-vd3 is more than 22, wherein vd2 is the dispersion coefficient of the second lens, and vd3 is the dispersion coefficient of the third lens.
6. The fixed-focus low-chromatic-aberration optical imaging lens according to claim 1, further satisfying: vd4 is less than or equal to 29, vd5 is more than or equal to 68, and vd5-vd4 is more than 29, wherein vd4 is the dispersion coefficient of the fourth lens, and vd5 is the dispersion coefficient of the fifth lens.
7. The fixed-focus low-chromatic-aberration optical imaging lens according to claim 1, further satisfying: nd6 is more than 1.9, wherein nd6 is the refractive index of the sixth lens.
8. The fixed-focus low-chromatic-aberration optical imaging lens according to claim 1, characterized in that: the temperature coefficient of relative refractive index dn/dt of the second lens and the sixth lens is negative.
9. The fixed-focus low-chromatic-aberration optical imaging lens according to claim 1, further satisfying: ALT <11mm, ALG <9mm, ALT/ALG <1.5, wherein ALG is the sum of air gaps from the first lens to the imaging surface on the optical axis, and ALT is the sum of six lens thicknesses from the first lens to the sixth lens on the optical axis.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113933971A (en) * | 2021-10-29 | 2022-01-14 | 歌尔光学科技有限公司 | Projection lens and projection device |
| CN115793201A (en) * | 2022-12-20 | 2023-03-14 | 福建福特科光电股份有限公司 | Ultra-high resolution iris identification lens |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113933971A (en) * | 2021-10-29 | 2022-01-14 | 歌尔光学科技有限公司 | Projection lens and projection device |
| WO2023070810A1 (en) * | 2021-10-29 | 2023-05-04 | 歌尔光学科技有限公司 | Projection lens and projection device |
| CN115793201A (en) * | 2022-12-20 | 2023-03-14 | 福建福特科光电股份有限公司 | Ultra-high resolution iris identification lens |
| CN115793201B (en) * | 2022-12-20 | 2023-09-19 | 福建福特科光电股份有限公司 | Ultra-high resolution iris recognition lens |
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