CN116300007A - Optical lens - Google Patents
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- CN116300007A CN116300007A CN202310575859.4A CN202310575859A CN116300007A CN 116300007 A CN116300007 A CN 116300007A CN 202310575859 A CN202310575859 A CN 202310575859A CN 116300007 A CN116300007 A CN 116300007A
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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
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The invention provides an optical lens, which comprises six lenses in sequence from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object side surface and a concave image side surface; a second lens having positive optical power, both the object-side surface and the image-side surface of which are convex; a diaphragm; a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex; a fourth lens element having negative optical power, both the object-side and image-side surfaces thereof being concave; a fifth lens element with positive refractive power having convex object-side and image-side surfaces; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface. The optical lens provided by the invention can effectively limit the length of the lens, is beneficial to realizing miniaturization of the optical lens, and improves the resolution of the optical lens, reduces aberration and improves the imaging quality of the optical lens through reasonable configuration of the lens surfaces and reasonable collocation of optical power.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
Along with the continuous improvement of the requirements of people on driving experience, the vehicle-mounted application optical lens is increasingly used in intelligent driving, and the position of the vehicle-mounted optical lens in the related industries of automobiles is continuously improved.
In order to meet the requirements of a host factory on the safety of rear passengers (especially the locking of children in a car) and the omission monitoring of articles, the technical specification of a lens for in-cabin monitoring is proposed in the current industry. At present, the lens for in-cabin monitoring is required to be smaller in size due to assembly requirements, so that miniaturization of the lens is important. In addition to the light, thin, short and small shape, high pixel, high resolution and other characteristics of the conventional optical lens, the optical lens is required to be capable of clearly imaging under the low-illumination condition, so that an optical lens with good imaging effect needs to be developed.
Disclosure of Invention
In view of the foregoing, an object of the present invention is to provide an optical lens having an advantage of excellent imaging quality.
The invention provides an optical lens, which comprises six lenses in sequence from an object side to an imaging surface along an optical axis:
the first lens with negative focal power has a convex object side surface and a concave image side surface;
a second lens having positive optical power, both the object-side surface and the image-side surface of which are convex;
a diaphragm;
a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex;
a fourth lens element having negative optical power, both the object-side and image-side surfaces thereof being concave;
a fifth lens element with positive refractive power having convex object-side and image-side surfaces;
a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
the object side surface curvature radius R of the second lens 3 Radius of curvature R of image side 4 The method meets the following conditions: -1<(R 3 +R 4 )/(R 3 -R 4 )<-0.5。
Further preferably, the focal length f of the first lens 1 Focal length f of the sixth lens 6 The method meets the following conditions: 0.95<f 1 /f 6 <1.05。
Further preferably, the optical total length TTL and the effective focal length f of the optical lens satisfy: 3.0< TTL/f <3.3.
Further preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 1.1< TTL/IH <1.3.
Further preferably, the effective focal length f of the optical lens and the maximum field angle FOV and the real image height IH corresponding to the maximum field angle satisfy: 0.6< (IH/2)/(f×tan (FOV/2)) <0.7.
Further preferably, the optical back focal length BFL and the effective focal length f of the optical lens satisfy: BFL/f > 0.85.
Further preferably, the effective focal length f of the optical lens and the focal length f of the second lens 2 The method meets the following conditions: 2.5<f 2 /f<3.3。
Further preferably, the focal length f of the third lens 3 Focal length f of the fourth lens 4 The method meets the following conditions: -0.9<f 3 /f 4 <-0.8。
Further preferably, a combined focal length f of the first lens to the second lens 12 Combined focal length f with the third to sixth lenses 36 The method meets the following conditions: -3.2<f 12 /f 36 <-2.5。
Further preferably, the object side surface of the first lens has a sagittal height Sag 1 Half-caliber d communicated with object side surface 1 And an object-side sagittal height Sag of the second lens 2 Half-aperture d with image side surface light transmission 2 The method meets the following conditions: -0.5<Sag 1 /d 1 -Sag 2 /d 2 <-0.4。
The optical lens provided by the invention can effectively limit the length of the lens, is beneficial to realizing miniaturization of the optical lens, and improves the resolution of the optical lens, reduces aberration and improves the imaging quality of the optical lens through reasonable configuration of the lens surfaces and reasonable collocation of optical power.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an optical lens in embodiment 1 of the present invention.
Fig. 2 is a graph showing a field curvature of an optical lens in embodiment 1 of the present invention.
Fig. 3 is an MTF graph of the optical lens in example 1 of the present invention.
Fig. 4 is an axial aberration diagram of the optical lens in embodiment 1 of the present invention.
Fig. 5 is a vertical axis chromatic aberration diagram of an optical lens in embodiment 1 of the present invention.
Fig. 6 is a schematic structural diagram of an optical lens in embodiment 2 of the present invention.
Fig. 7 is a graph showing a field curvature of an optical lens in embodiment 2 of the present invention.
Fig. 8 is an MTF graph of the optical lens in example 2 of the present invention.
Fig. 9 is an axial aberration diagram of the optical lens in embodiment 2 of the present invention.
Fig. 10 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 2 of the present invention.
Fig. 11 is a schematic structural diagram of an optical lens in embodiment 3 of the present invention.
Fig. 12 is a graph showing the field curvature of an optical lens in embodiment 3 of the present invention.
Fig. 13 is an MTF graph of an optical lens in example 3 of the present invention.
Fig. 14 is an axial aberration diagram of an optical lens in embodiment 3 of the present invention.
Fig. 15 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 3 of the present invention.
Fig. 16 is a schematic structural diagram of an optical lens in embodiment 4 of the present invention.
Fig. 17 is a graph showing the field curvature of an optical lens in embodiment 4 of the present invention.
Fig. 18 is an MTF graph of the optical lens in example 4 of the present invention.
Fig. 19 is an axial aberration diagram of the optical lens in embodiment 4 of the present invention.
Fig. 20 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 4 of the present invention.
Fig. 21 is a schematic structural diagram of an optical lens in embodiment 5 of the present invention.
Fig. 22 is a graph showing the field curvature of an optical lens in embodiment 5 of the present invention.
Fig. 23 is an MTF graph of an optical lens in example 5 of the present invention.
Fig. 24 is an axial aberration diagram of the optical lens in embodiment 5 of the present invention.
Fig. 25 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 5 of the present invention.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of the present application and are not intended to limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present invention.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The optical lens according to the embodiment of the invention includes, in order from an object side to an image side along an optical axis: the optical lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens and an optical filter.
In some embodiments, the first lens may have negative optical power, which facilitates reducing the tilt angle of incident light rays, thereby achieving effective sharing of the large field of view of the object. The object side surface of the first lens is a convex surface, and the image side surface is a concave surface, so that the light rays with the edge view fields can be collected as much as possible and enter the rear optical lens, and the collection of the light rays with a large angle can be realized.
In some embodiments, the second lens may have positive optical power, which is advantageous for converging light while reducing the angle of deflection of the light, and for smooth transition of the light profile. The object side surface and the image side surface of the second lens are convex, so that various aberrations generated by the optical lens are balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the third lens may have positive optical power, which is beneficial to further converging light and reducing the light deflection angle at the same time, so that the light trend is smoothly transited. The object side surface and the image side surface of the third lens are convex, so that various aberrations generated by the optical lens are balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the fourth lens element may have negative refractive power, and the object-side surface and the image-side surface of the fourth lens element are concave, so as to balance various aberrations generated by the optical lens element and improve the imaging quality of the optical lens element.
In some embodiments, the fifth lens element has positive focal power, which is beneficial to improving the light converging capability of the optical lens element, and the object-side surface and the image-side surface of the fifth lens element are convex, so as to reduce spherical aberration and coma aberration generated by the fifth lens element, and improve the imaging quality of the optical lens element.
In some embodiments, the sixth lens has negative focal power, which is beneficial to increasing the imaging area of the optical lens and improving the imaging quality of the optical lens. The object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface, so that the chromatic aberration of the optical lens can be optimized, and the imaging quality of the optical lens can be improved.
In some embodiments, the object side sagittal height Sag of the first lens of the optical lens 1 Half-caliber d communicated with object side surface 1 And an object-side sagittal height Sag of the second lens 2 Half-aperture d with image side surface light transmission 2 The method meets the following conditions: -0.5<Sag 1 /d 1 -Sag 2 /d 2 <-0.4. The above range is satisfied, the characteristic that the first lens is too bent and is difficult to process in the common wide-angle lens can be overcome, and the manufacturing manufacturability of the first lens is effectively improved.
In some embodiments, the maximum field angle FOV of the optical lens satisfies: 120 ° < FOV <130 °. Satisfying the above range, the optical lens can be realized to have a large angle of view.
In some embodiments, the focal length f of the first lens 1 Focal length f with sixth lens 6 The method meets the following conditions: 0.95<f 1 /f 6 <1.05. The range is met, so that the front-back symmetrical design of the optical lens can reduce the tolerance sensitivity of the lens, improve the assembly yield and improve the imaging quality of the optical lens.
In some embodiments, the optical total length TTL and the effective focal length f of the optical lens satisfy: 3.0< TTL/f <3.3. The length of the lens can be effectively limited by meeting the above range, and the miniaturization of the optical lens can be realized.
In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 1.1< TTL/IH <1.3. The requirements of high image height and miniaturization of the optical lens can be effectively balanced by meeting the range.
In some embodiments, the effective focal length f of the optical lens and the maximum field angle FOV and the real image height IH corresponding to the maximum field angle satisfy: 0.6< (IH/2)/(f×tan (FOV/2)) <0.7. The requirements are met, the large angle of view is achieved, and better blurring of the background and highlighting of the main body are facilitated when people are shot.
In some embodiments, the optical back focal length BFL and the effective focal length f of the optical lens satisfy: BFL/f > 0.85. The optical lens meets the above range, is beneficial to achieving balance between good imaging quality and optical back focal length easy to assemble, ensures the imaging quality of the optical lens, avoids interference between the lens and other elements, and reduces the difficulty of the assembly process of the camera module.
In some embodiments, the effective focal length f of the optical lens is equal to the focal length f of the first lens 1 The method meets the following conditions: -1.5<f 1 /f<0. The range is satisfied, the first lens has smaller negative focal power, the field angle of the optical lens is favorably increased, the refractive angle change of incident light is mild, excessive aberration caused by excessively strong refractive change is avoided, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the second lens 2 The method meets the following conditions: 2.5<f 2 /f<3.3. The second lens has proper positive focal power, is favorable for converging light, ensures that divergent light entering the system from the front smoothly enters the rear optical system, ensures that the light trend is more gentle, optimizes aberration and improves resolution.
In some embodiments, the focal length f of the third lens 3 Focal length f of fourth lens 4 The method meets the following conditions: -0.9<f 3 /f 4 <-0.8. The spherical aberration of the optical lens can be corrected and the imaging quality of the optical lens can be improved by meeting the above range.
In some embodiments, the combined focal length f of the first lens to the second lens 12 Combined focal length f with third to sixth lenses 36 The method meets the following conditions: -3.2<f 12 /f 36 <-2.5. The range is satisfied, front and rear lens focal length distribution is balanced, a large field angle is provided, and meanwhile, various aberration correction difficulties are reduced.
In some embodiments, the second lens has an object-side radius of curvature R 3 Radius of curvature R of image side 4 The method meets the following conditions: -1<(R 3 +R 4 )/(R 3 -R 4 )<-0.5. The optical lens coma aberration can be corrected, and the imaging quality of the optical lens can be improved.
In some embodiments, the object-side radius of curvature R of the first lens 1 Radius of curvature R of image side 2 The method meets the following conditions: 1.9<(R 1 +R 2 )/(R 1 -R 2 )<2.0. The range is satisfied, the large angle of view is provided, and better blurring of the background and highlighting of the subject are facilitated when shooting the person.
In some embodiments, the first lens to second lens is an air gap CT on the optical axis 12 Center thickness CT along the optical axis with the second lens 2 The method meets the following conditions: 0.6<CT 12 /CT 2 <0.8. The above range is satisfied, the duty ratio of the air gap between the lenses can be reduced, the length of the lens can be effectively limited, and the miniaturization of the optical lens can be realized.
For better optical performance of the system, a plurality of aspheric lenses are adopted in the lens, and the shape of each aspheric surface of the optical lens meets the following equation:
wherein z is the distance between the curved surface and the curved surface vertex in the optical axis direction, h is the distance between the optical axis and the curved surface, c is the curvature of the curved surface vertex, K is the quadric surface coefficient, and A, B, C, D, E, F, G, H is the second, fourth, sixth, eighth, tenth, fourteen and sixteen order surface coefficients respectively.
The invention is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present invention are intended to be equivalent substitutes within the scope of the present invention.
Example 1
Referring to fig. 1, a schematic structural diagram of an optical lens provided in embodiment 1 of the present invention is shown, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens L2 has positive focal power, and an object side surface S3 and an image side surface S4 of the second lens L2 are both convex surfaces;
a diaphragm ST;
the third lens element L3 has positive refractive power, and both an object-side surface S5 and an image-side surface S6 thereof are convex;
the fourth lens element L4 has negative focal power, and both the object-side surface S7 and the image-side surface S8 thereof are concave surfaces;
the fifth lens element L5 has positive refractive power, and both an object-side surface S9 and an image-side surface S10 thereof are convex;
the sixth lens element L6 with negative refractive power has a convex object-side surface S11 and a concave image-side surface S12;
the object side surface S13 and the image side surface S14 of the optical filter G1 are planes;
the imaging surface S15 is a plane.
The relevant parameters of each lens in the optical lens in example 1 are shown in tables 1-1.
TABLE 1-1
The surface profile parameters of the aspherical lens of the optical lens in example 1 are shown in tables 1 to 2.
TABLE 1-2
In this embodiment, a field curve graph, an MTF graph, an axial aberration graph, and a vertical axis aberration graph of the optical lens are shown in fig. 2, 3, 4, and 5, respectively.
Fig. 2 shows a field curve of example 1, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.05 mm to 0.09mm, which indicates that the optical lens can well correct the field curvature.
Fig. 3 shows an MTF (modulation transfer function) graph of example 1, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.35 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 4 shows an axial aberration diagram of example 1, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within-30 mu m to 10 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 5 shows a vertical axis color difference graph of example 1, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-2 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Example 2
Referring to fig. 6, a schematic structural diagram of an optical lens provided in embodiment 2 of the present invention is shown, and the present embodiment is mainly characterized in that the optical parameters such as the radius of curvature and the thickness of the lens are different from those of embodiment 1.
The relevant parameters of each lens in the optical lens in example 2 are shown in table 2-1.
TABLE 2-1
The surface profile parameters of the aspherical lens of the optical lens in example 2 are shown in tables 2-2.
TABLE 2-2
In this embodiment, a field curve graph, an MTF graph, an axial aberration graph, and a vertical axis aberration graph of the optical lens are shown in fig. 7, 8, 9, and 10, respectively.
Fig. 7 shows a field curvature curve of example 2, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.06 mm to 0.04mm, which indicates that the optical lens can well correct the field curvature.
Fig. 8 shows an MTF (modulation transfer function) graph of example 2, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.3 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 9 shows an axial aberration diagram of example 2, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within-30 mu m to 10 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 10 shows a vertical axis color difference graph of example 2, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-2 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Example 3
Referring to fig. 11, a schematic structural diagram of an optical lens provided in embodiment 3 of the present invention is shown, and the present embodiment is mainly characterized in that the optical parameters such as the radius of curvature and the thickness of the lens are different from those of embodiment 1.
The relevant parameters of each lens in the optical lens in example 3 are shown in table 3-1.
TABLE 3-1
The surface profile parameters of the aspherical lens of the optical lens in example 3 are shown in table 3-2.
TABLE 3-2
In this embodiment, a field curve graph, an MTF graph, an axial aberration graph, and a vertical axis aberration graph of the optical lens are shown in fig. 12, 13, 14, and 15, respectively.
Fig. 12 shows a field curve of example 3, which shows the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis shows the amount of shift (unit: mm), and the vertical axis shows the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.06 mm to 0.1mm, which indicates that the optical lens can well correct the field curvature.
Fig. 13 shows an MTF (modulation transfer function) graph of example 3, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.3 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 14 shows an axial aberration diagram of example 3, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-30 mu m to 5 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 15 shows a vertical axis color difference graph of example 3, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-2 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Example 4
Referring to fig. 16, a schematic structural diagram of an optical lens provided in embodiment 4 of the present invention is shown, and the present invention is mainly characterized in that the optical parameters such as the radius of curvature and the thickness of the lens are different from those of embodiment 1.
The relevant parameters of each lens in the optical lens in example 4 are shown in table 4-1.
TABLE 4-1
The surface profile parameters of the aspherical lens of the optical lens in example 4 are shown in table 4-2.
TABLE 4-2
In this embodiment, a field curve graph, an MTF graph, an axial aberration graph, and a vertical axis aberration graph of the optical lens are shown in fig. 17, 18, 19, and 20, respectively.
Fig. 17 shows a field curve of example 4, which shows the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis shows the amount of shift (unit: mm), and the vertical axis shows the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.06 mm to 0.08mm, which indicates that the optical lens can well correct the field curvature.
Fig. 18 shows an MTF (modulation transfer function) graph of example 4, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.3 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 19 shows an axial aberration diagram of example 4, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within-25 mu m to 10 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 20 shows a vertical axis color difference graph of example 4, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-2 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Example 5
Referring to fig. 21, a schematic structural diagram of an optical lens provided in embodiment 5 of the present invention is shown, and the present invention is mainly characterized in that the optical parameters such as the radius of curvature and the thickness of the lens are different from those of embodiment 1.
The relevant parameters of each lens in the optical lens in example 5 are shown in table 5-1.
TABLE 5-1
The surface profile parameters of the aspherical lens of the optical lens in example 5 are shown in table 5-2.
TABLE 5-2
In this embodiment, a field curve graph, an MTF graph, an axial aberration graph, and a vertical axis aberration graph of the optical lens are shown in fig. 22, 23, 24, and 25, respectively.
Fig. 22 shows a field curve of example 5, which shows the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis shows the amount of shift (unit: mm), and the vertical axis shows the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.09 mm to 0.05mm, which indicates that the optical lens can well correct the field curvature.
Fig. 23 shows an MTF (modulation transfer function) graph of example 5, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.4 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 24 shows an axial aberration diagram of example 5, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within-20 mu m to 10 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 25 shows a vertical axis color difference graph of example 5, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-2 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Referring to table 6, the optical characteristics corresponding to the above embodiments include the effective focal length f, the total optical length TTL, the aperture value FNO, the real image height IH, the maximum field angle FOV and the numerical value corresponding to each conditional expression in the embodiments.
TABLE 6-1
In summary, the optical lens provided by the invention can effectively limit the length of the lens, is beneficial to realizing miniaturization of the optical lens, and improves the resolution of the optical lens, reduces aberration and improves the imaging quality of the optical lens through reasonable configuration of the lens surfaces and reasonable collocation of optical power.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. An optical lens, six lens altogether, characterized by, along the optical axis from the object side to the imaging plane in order:
the first lens with negative focal power has a convex object side surface and a concave image side surface;
a second lens having positive optical power, both the object-side surface and the image-side surface of which are convex;
a diaphragm;
a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex;
a fourth lens element having negative optical power, both the object-side and image-side surfaces thereof being concave;
a fifth lens element with positive refractive power having convex object-side and image-side surfaces;
a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
the object side surface curvature radius R of the second lens 3 Radius of curvature R of image side 4 The method meets the following conditions: -1<(R 3 +R 4 )/(R 3 -R 4 )<-0.5。
2. The optical lens of claim 1, wherein the focal length f of the first lens 1 Focal length f of the sixth lens 6 The method meets the following conditions: 0.95<f 1 /f 6 <1.05。
3. The optical lens of claim 1, wherein the optical total length TTL and the effective focal length f of the optical lens satisfy: 3.0< TTL/f <3.3.
4. The optical lens according to claim 1, wherein the real image height IH corresponding to the total optical length TTL and the maximum field angle of the optical lens satisfies: 1.1< TTL/IH <1.3.
5. The optical lens according to claim 1, wherein the effective focal length f of the optical lens satisfies a real image height IH corresponding to a maximum field angle FOV and a maximum field angle: 0.6< (IH/2)/(f×tan (FOV/2)) <0.7.
6. The optical lens of claim 1, wherein an optical back focal length BFL and an effective focal length f of the optical lens satisfy: BFL/f > 0.85.
7. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f of the second lens 2 The method meets the following conditions: 2.5<f 2 /f<3.3。
8. The optical lens as claimed in claim 1, wherein a focal length f of the third lens 3 Focal length f of the fourth lens 4 The method meets the following conditions: -0.9<f 3 /f 4 <-0.8。
9. The optical lens of claim 1, wherein a combined focal length f of the first lens to the second lens 12 Combined focal length f with the third to sixth lenses 36 The method meets the following conditions: -3.2<f 12 /f 36 <-2.5。
10. The optical lens of claim 1, wherein the first lens has an object side sagittal height Sag 1 Half-caliber d communicated with object side surface 1 And an object-side sagittal height Sag of the second lens 2 Half-aperture d with image side surface light transmission 2 The method meets the following conditions: -0.5<Sag 1 /d 1 -Sag 2 /d 2 <-0.4。
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| CN117389010A (en) * | 2023-12-11 | 2024-01-12 | 江西联创电子有限公司 | Optical lens |
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| CN111103672A (en) * | 2018-10-25 | 2020-05-05 | 宁波舜宇车载光学技术有限公司 | Optical lens |
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