CN211375167U - Large-light-transmission high-resolution optical imaging lens - Google Patents
Large-light-transmission high-resolution optical imaging lens Download PDFInfo
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- CN211375167U CN211375167U CN202020272904.0U CN202020272904U CN211375167U CN 211375167 U CN211375167 U CN 211375167U CN 202020272904 U CN202020272904 U CN 202020272904U CN 211375167 U CN211375167 U CN 211375167U
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Abstract
The utility model relates to a camera lens technical field. The utility model discloses an optical imaging lens with large light transmission and high resolution, which comprises six lenses, wherein the first lens is a convex flat lens with positive refractive index; the second lens is a convex-concave lens with positive refractive index; the third lens element has negative refractive index and concave image-side surface; the fourth lens is a concave lens with negative refractive index, and the fifth lens is a convex lens with positive refractive index; the sixth lens element with positive refractive power has a convex object-side surface, and the fourth lens element is cemented with the fifth lens element. The utility model has long focal length; high resolution and uniform image; a large image plane; the light is transmitted greatly, and the low-light characteristic is good; low distortion.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to an optical imaging camera lens of big light through high resolution.
Background
With the continuous progress of science and technology and the continuous development of society, in recent years, the optical imaging lens is also rapidly developed and widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring and the like, so that the requirement on the optical imaging lens is higher and higher. However, the existing optical imaging lens with a longer focal length (such as a 16mm focal length section) has some defects, such as poor control over a transfer function, low resolution and non-uniform image; the image surface is smaller; the light passing is generally small, the light entering brightness is low in a low-light environment, and the shot picture is dark; the method has the defects of poor control on distortion, easy deformation of images and objects, inaccurate identification and the like, and cannot meet the increasingly improved requirements, so that the method needs to be improved.
Disclosure of Invention
An object of the utility model is to provide a big through-light high resolution's optical imaging lens 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 large light transmission and high resolution 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 element to the sixth lens element respectively comprise an object side surface facing the object side and allowing the imaging light to pass and an image side surface facing the image side and allowing the imaging light to pass;
the first lens element with positive refractive index has a convex object-side surface and a flat image-side surface;
the second lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface;
the fourth lens and the fifth lens are mutually glued;
the optical imaging lens has only the six lenses with the refractive indexes.
Further, the optical imaging lens further satisfies the following conditions: vd4 is less than or equal to 42, and vd5 is more than or equal to 54, wherein vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens.
Further, the temperature coefficient of refractive index dn/dt of the fifth lens is negative.
Further, the optical imaging lens further satisfies the following conditions: nd6 is more than or equal to 1.85, wherein nd6 is the refractive index of the sixth lens.
Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.
Furthermore, the optical imaging lens further satisfies the following conditions: 0.6< TTL1/TTL2<1.5, where TTL1 is an axial distance from an object-side surface of the first lens element to an image-side surface of the third lens element, and TTL2 is an axial distance from an object-side surface of the fourth lens element to an image-side surface of the sixth lens element.
Further, the optical imaging lens further satisfies the following conditions: 2.5< TTL/BFL <3.4, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and BFL is the optical back focal length.
Further, the optical imaging lens further satisfies the following conditions: ALT <15mm, ALG <12mm, 1.1< ALT/ALG <1.8, where ALG is a sum of air gaps of the first lens to an image plane on the optical axis, and ALT is a sum of six lens thicknesses of the first lens to the sixth lens on the optical axis.
Further, the second lens bears directly against the third lens.
Further, the third lens bears directly against the fourth lens.
The utility model has the advantages of:
the utility model adopts six lenses, and has longer focal length by correspondingly designing each lens; the resolution is high, and the image is uniform; the image surface is large, and a sensor (sensor) of 1/2' can be supported; the light transmission is large, more light can be obtained, the picture of the shot picture is bright, and the relative illumination is high; small distortion, small image deformation and more accurate restoration of the image. Furthermore, the utility model discloses a compact structure.
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 486-;
fig. 3 is a schematic view of curvature of field and distortion according to a first embodiment of the present invention;
fig. 4 is a schematic view of a vertical axis aberration diagram according to a first embodiment of the present invention;
fig. 5 is a relative illuminance chart of 0.656 μm according to the first embodiment of the present invention;
FIG. 6 is the MTF graph of 486-;
fig. 7 is a schematic view of curvature of field and distortion according to a second embodiment of the present invention;
fig. 8 is a schematic view of vertical axis aberration diagram according to the second embodiment of the present invention;
fig. 9 is a relative illuminance chart of 0.656 μm according to example two of the present invention;
FIG. 10 is the MTF graph of 486-;
fig. 11 is a schematic view of curvature of field and distortion according to a third embodiment of the present invention;
fig. 12 is a schematic view of vertical axis aberration diagram according to a third embodiment of the present invention;
fig. 13 is a relative illuminance chart of 0.656 μm according to a third embodiment of the present invention;
fig. 14 is a table of values of important parameters according to three embodiments 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.
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 utility model provides an optical imaging lens with large light transmission and high resolution, which comprises a first lens, a second lens and a third lens from an object side to an image side along an optical axis in sequence; 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 flat image-side surface.
The second lens element with positive refractive index has a convex object-side surface and a concave image-side surface; the second lens adopts a meniscus lens, and has a larger effect on correcting distortion.
The third lens element with negative refractive power has a concave image-side surface.
The fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The sixth lens element with positive refractive index has a convex object-side surface.
The fourth lens and the fifth lens are mutually glued; the optical imaging lens has only the six lenses with the refractive indexes.
The utility model adopts six lenses, and has longer focal length by correspondingly designing each lens; the resolution is high, and the image is uniform; the image surface is large and can support 1/2' sensor; the light transmission is large, more light can be obtained, the picture of the shot picture is bright, and the relative illumination is high; small distortion, small image deformation and more accurate restoration of the image.
Preferably, the optical imaging lens further satisfies: vd4 is not more than 42, vd5 is not less than 54, 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, so that chromatic aberration can be corrected, the image quality can be optimized, and the system performance can be improved.
More preferably, the temperature coefficient of refractive index dn/dt of the fifth lens element is negative, i.e. the refractive index decreases with increasing temperature, the refractive index of the fifth lens element is positive, and with increasing temperature, the change of the back focus of the fifth lens element due to increasing temperature increases, thereby effectively controlling the temperature drift.
Preferably, the optical imaging lens further satisfies: nd6 is more than or equal to 1.85, wherein nd6 is the refractive index of the sixth lens, and the image quality is further improved by adopting a high-refractive-index material.
Preferably, the optical diaphragm is arranged between the third lens and the fourth lens, so that the structure is more compact, and the system performance is further improved.
More preferably, the optical imaging lens further satisfies: 0.6< TTL1/TTL2<1.5, wherein TTL1 is the distance on the optical axis from the object side surface of the first lens element to the image side surface of the third lens element, and TTL2 is the distance on the optical axis from the object side surface of the fourth lens element to the image side surface of the sixth lens element, so that the optical imaging lens is more compact in structure.
Preferably, the optical imaging lens further satisfies: 2.5< TTL/BFL <3.4, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and BFL is the optical back focal length, so that the structure of the optical imaging lens is more compact.
Preferably, the optical imaging lens further satisfies: ALT <15mm, ALG <12mm, 1.1< ALT/ALG <1.8, wherein ALG is the sum of air gaps between the first lens and an imaging surface on the optical axis, and ALT is the sum of six lens thicknesses between the first lens and the sixth lens on the optical axis, so that the optical imaging lens is further shortened in system length, easy to manufacture and optimized in system configuration.
Preferably, the second lens bears directly against the third lens, providing a well designed tolerance support and making the optical imaging lens more compact.
Preferably, the third lens bears directly on the fourth lens, providing a good tolerance support for the structural design and making the optical imaging lens more compact.
The optical imaging lens of the present invention will be described in detail with reference to specific embodiments.
Example one
As shown in fig. 1, the optical imaging lens with large light transmission and high resolution comprises a first lens 1, a second lens 2, a third lens 3, a diaphragm 7, a fourth lens 4, a fifth lens 5, a sixth lens 6, a protective sheet 8 and an imaging surface 9 in sequence from an object side a1 to an image side a2 along an optical axis I; 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, the object-side surface 11 of the first lens element 1 is a convex surface, and the image-side surface 12 of the first lens element 1 is a flat surface.
The second lens element 2 has a positive refractive index, and an object-side surface 21 of the second lens element 2 is convex and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has negative refractive index, the object-side surface 31 of the third lens element 3 is convex, and the image-side surface 32 of the third lens element 3 is concave, although in other embodiments, the object-side surface 31 of the third lens element 3 can also be concave or planar.
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, the object-side surface 51 of the fifth lens element 5 is a convex surface, the image-side surface 52 of the fifth lens element 5 is a convex surface, and the fourth lens element 4 and the fifth lens element 5 are cemented with each other.
The sixth lens element 6 with positive refractive power has a convex object-side surface 61 of the sixth lens element 6 and a planar image-side surface 62 of the sixth lens element 6, although the image-side surface 62 of the sixth lens element 6 can be convex or concave in other embodiments.
In this embodiment, the temperature coefficient of refractive index dn/dt of the fifth lens element 5 is negative.
In this embodiment, the second lens 2 directly bears against the third lens 3, and of course, in some embodiments, the third lens 3 also directly bears against the fourth lens 4, so as to further provide a tolerance support for the design and make the optical imaging lens more compact.
Of course, in some 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 fig. 14 for the numerical values of the conditional expressions in this embodiment.
Referring to fig. 2, it can be seen that the resolution of the present embodiment is high, the resolution of the full view field can reach 200lp/mm >0.2, and the image is uniform; the field curvature and distortion diagram are shown in detail in (A) and (B) of FIG. 3, and it can be seen that the distortion is small, less than-1%; the vertical axis aberration diagram is shown in detail in FIG. 4, and it can be seen that the aberration is small; the relative illuminance is shown in fig. 5, and it can be seen that the relative illuminance is > 68%.
In this embodiment, f is 16.3mm, FNO is 1.83, FOV is 29 °, Φ is 8.36mm, and TTL is 24.00mm, where f is the focal length of the optical imaging lens, FNO is the aperture value of the optical imaging lens, FOV is the field angle of the optical imaging lens, Φ is the image plane diameter of the optical imaging lens, and TTL is the distance from the object-side surface 11 of the first lens 1 to the image plane 9 on the optical axis I.
Example two
In this embodiment, the surface convexities and concavities and refractive indexes of the respective lenses are substantially the same as those of the first embodiment, only the object-side surface 31 of the third lens element 3 is a concave surface, and the image-side surface 62 of the sixth lens element 6 is a convex surface, and the optical parameters such as the curvature radius of the lens surfaces and the lens thickness 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. 14 for the numerical values of the conditional expressions in this embodiment.
Referring to fig. 6, it can be seen that the resolution is high, the resolution of the full view field can reach 200lp/mm >0.2, and the image is uniform; the field curvature and distortion diagram are shown in detail in (A) and (B) of FIG. 7, and it can be seen that the distortion is small, less than-1%; the vertical axis aberration diagram is shown in detail in fig. 8, and it can be seen that the aberration is small; the relative illuminance map is shown in fig. 9, and it can be seen that the relative illuminance is > 68%.
In this embodiment, f is 16.3mm, FNO is 1.83, FOV is 29 °, Φ is 8.36mm, and TTL is 23.99 mm.
EXAMPLE III
In this embodiment, the surface convexities and concavities and refractive indexes of the respective lenses are substantially the same as those of the first embodiment, only the object-side surface 31 of the third lens element 3 is a concave surface, and the image-side surface 62 of the sixth lens element 6 is a concave surface.
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. 14 for the numerical values of the conditional expressions in this embodiment.
Referring to fig. 10, it can be seen that the resolution of the present embodiment is high, the resolution of the full view field can reach 200lp/mm >0.2, and the image is uniform; the field curvature and distortion diagram are shown in detail in (A) and (B) of FIG. 11, and it can be seen that the distortion is small, less than-1%; the vertical axis aberration diagram is shown in detail in FIG. 12, and it can be seen that the aberration is small; the relative illuminance map is shown in fig. 13, and it can be seen that the relative illuminance is > 70%.
In this embodiment, f is 16.3mm, FNO is 1.83, FOV is 29 °, Φ is 8.33mm, and TTL is 24.06 mm.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An optical imaging lens with large light transmission and high resolution is characterized in that: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side along an optical axis; the first lens element to the sixth lens element respectively comprise an object side surface facing the object side and allowing the imaging light to pass and an image side surface facing the image side and allowing the imaging light to pass;
the first lens element with positive refractive index has a convex object-side surface and a flat image-side surface;
the second lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface;
the fourth lens and the fifth lens are mutually glued;
the optical imaging lens has only the six lenses with the refractive indexes.
2. The large-pass high-resolution optical imaging lens according to claim 1, further satisfying: vd4 is less than or equal to 42, and vd5 is more than or equal to 54, wherein vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens.
3. The large-pass high-resolution optical imaging lens according to claim 2, characterized in that: the temperature coefficient of refractive index dn/dt of the fifth lens is negative.
4. The large-pass high-resolution optical imaging lens according to claim 1, further satisfying: nd6 is more than or equal to 1.85, wherein nd6 is the refractive index of the sixth lens.
5. The large-pass high-resolution optical imaging lens according to claim 1, characterized in that: the diaphragm is arranged between the third lens and the fourth lens.
6. The large-pass high-resolution optical imaging lens according to claim 5, further satisfying: 0.6< TTL1/TTL2<1.5, where TTL1 is an axial distance from an object-side surface of the first lens element to an image-side surface of the third lens element, and TTL2 is an axial distance from an object-side surface of the fourth lens element to an image-side surface of the sixth lens element.
7. The large-pass high-resolution optical imaging lens according to claim 5, further satisfying: 2.5< TTL/BFL <3.4, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and BFL is the optical back focal length.
8. The large-pass high-resolution optical imaging lens according to claim 1, further satisfying: ALT <15mm, ALG <12mm, 1.1< ALT/ALG <1.8, where ALG is a sum of air gaps of the first lens to an image plane on the optical axis, and ALT is a sum of six lens thicknesses of the first lens to the sixth lens on the optical axis.
9. The large-pass high-resolution optical imaging lens according to claim 1, characterized in that: the second lens bears directly against the third lens.
10. The large-pass high-resolution optical imaging lens according to claim 1, characterized in that: the third lens bears directly against the fourth lens.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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