CN115508986A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN115508986A CN115508986A CN202211430485.9A CN202211430485A CN115508986A CN 115508986 A CN115508986 A CN 115508986A CN 202211430485 A CN202211430485 A CN 202211430485A CN 115508986 A CN115508986 A CN 115508986A
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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
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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 seven lenses in total, wherein the seven lenses are sequentially arranged from an object side to an imaging surface along an optical axis as follows: a first lens element having a negative refractive power, the object-side surface of which is convex and the image-side surface of which is concave; a second lens having a positive refractive power, both the object-side surface and the image-side surface of which are convex surfaces; the image side surface of the third lens is a convex surface; a fourth lens having positive refractive power, both of an object-side surface and an image-side surface of which are convex surfaces; a fifth lens element having a negative refractive power, both the object-side surface and the image-side surface of which are concave surfaces; a sixth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a seventh lens element having a negative refractive power, both the object-side surface and the image-side surface of which are concave surfaces; the total optical length TTL and the effective focal length f of the optical lens meet the following requirements: TTL/f is more than 1.6 and less than 1.9. The optical lens has the advantages of large field of view, large aperture and miniaturization.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
In recent years, with the rapid update of consumer electronics products such as mobile phones and tablet computers, the requirements of the market for product-side imaging lenses are increasingly diversified. In addition to the requirement of a slim, compact and high-resolution imaging lens, the requirement of a product-end imaging lens is to have a wide viewing angle. The wide-angle lens has the characteristics of short focal length, long depth of field, large field angle and the like, and can acquire more information under the same condition.
In view of the above, the present invention provides an optical lens suitable for portable electronic products, which has the characteristics of large aperture, excellent imaging quality, wide angle, and the like, and is compact in size.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an optical lens having advantages of a large field of view, a large aperture, and miniaturization.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an optical lens system comprises seven lenses, in order from an object side to an image plane along an optical axis:
a first lens element having a negative refractive power, the object-side surface of which is convex and the image-side surface of which is concave;
a diaphragm;
a second lens having a positive refractive power, both the object-side surface and the image-side surface of which are convex surfaces;
the image side surface of the third lens is a convex surface;
a fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex;
a fifth lens element having a negative refractive power, both the object-side surface and the image-side surface of the fifth lens element being concave;
a sixth lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
a seventh lens element having a negative refractive power, wherein both the object-side surface and the image-side surface are concave;
the total optical length TTL and the effective focal length f of the optical lens meet the following requirements: TTL/f is more than 1.6 and less than 1.9.
Preferably, the maximum field angle FOV of the optical lens satisfies: 120 degrees is less than or equal to FOV.
Preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.7 < TTL/IH < 0.9.
Preferably, the entrance pupil diameter EPD of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 4.5 < IH/EPD < 5.0.
Preferably, the effective focal length f, the maximum field angle FOV and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.6 ≦ (IH/2)/(f × tan (FOV/2)).
Preferably, the real image height IH corresponding to the maximum field angle FOV of the optical lens, the effective working aperture D1 of the object side surface of the first lens, and the maximum field angle satisfies: d is more than 0.15 1 /IH/tan(FOV/2)＜0.25。
Preferably, the radius of curvature R of the object-side surface of the first lens is 1 Radius of curvature R of image-side surface 2 Satisfies the following conditions: 6.0 < (R) 1 +R 2 )/(R 1 -R 2 )＜8.0。
Preferably, the first lens
Object lateral rise Sag 1 And light passing semi-aperture d 1 Image side rise Sag of the first lens 2 And light passing semi-aperture d 2 Satisfies the following conditions: | Sag 1 /d 1 -Sag 2 /d 2 |＜0.1。
Preferably, the effective focal length f of the optical lens and the distance CT between the first lens and the second lens on the optical axis 12 Satisfies the following conditions: f/CT of 5.0 < 12 ＜8.0。
Preferably, the total optical length TTL of the optical lens and the sum Σ CT of the central thicknesses of the first lens element to the seventh lens element along the optical axis satisfy: 0.5 < ∑ CT/TTL.
Compared with the prior art, the invention has the beneficial effects that: the optical lens of the application combines with focal power through the lens shape between each lens of reasonable collocation, has realized possessing big visual field, big light ring and miniaturized advantage.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical lens system according to embodiment 1 of the present invention;
fig. 2 is a field curvature graph of the optical lens in embodiment 1 of the present invention;
FIG. 3 is a graph showing F-tan θ distortion of the optical lens in embodiment 1 of the present invention;
fig. 4 is a graph showing a relative illuminance curve of the optical lens in embodiment 1 of the present invention;
fig. 5 is a MTF graph of the optical lens in embodiment 1 of the present invention;
fig. 6 is a graph showing axial aberration of the optical lens in embodiment 1 of the present invention;
fig. 7 is a vertical axis chromatic aberration curve diagram of the optical lens in embodiment 1 of the present invention;
fig. 8 is a schematic structural diagram of an optical lens system according to embodiment 2 of the present invention;
FIG. 9 is a graph of curvature of field of an optical lens in embodiment 2 of the present invention;
FIG. 10 is a graph showing F-tan θ distortion of an optical lens in example 2 of the present invention;
fig. 11 is a graph showing a relative illumination of an optical lens in embodiment 2 of the present invention;
fig. 12 is a MTF graph of an optical lens in embodiment 2 of the present invention;
fig. 13 is a graph showing axial aberration of the optical lens in embodiment 2 of the present invention;
FIG. 14 is a vertical axis chromatic aberration diagram of an optical lens in embodiment 2 of the present invention;
fig. 15 is a schematic structural view of an optical lens system according to embodiment 3 of the present invention;
fig. 16 is a graph of curvature of field of the optical lens in embodiment 3 of the present invention;
FIG. 17 is a graph showing F-tan θ distortion of an optical lens in embodiment 3 of the present invention;
fig. 18 is a graph showing a relative illuminance curve of the optical lens in embodiment 3 of the present invention;
fig. 19 is a MTF graph of an optical lens in embodiment 3 of the present invention;
FIG. 20 is a graph showing axial aberrations of an optical lens according to embodiment 3 of the present invention;
fig. 21 is a vertical axis chromatic aberration diagram of the optical lens in embodiment 3 of the present invention.
The following detailed description will further illustrate the invention 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 the detailed description is merely illustrative of embodiments of the application and does not limit the scope of the 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 this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present invention.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and 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, it means that 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 called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" 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. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. 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 present invention includes, in order from an object side to an image side: the lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens.
In some embodiments, the first lens element can have a negative power, and its object-side surface is convex and its image-side surface is concave; the second lens can have positive focal power, and the object-side surface and the image-side surface of the second lens are convex surfaces; the third lens can have positive focal power, and the image side surface of the third lens is a convex surface; the fourth lens can have positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens element may have a negative focal power, and both the object-side surface and the image-side surface thereof may be concave; the sixth lens element has positive focal power, and has a convex object-side surface and a concave image-side surface; the seventh lens element can have a negative optical power and both the object-side surface and the image-side surface can be concave.
In some embodiments, a diaphragm for limiting the light beam may be disposed between the first lens and the second lens, and the diaphragm may be disposed near an object-side surface of the second lens, so as to reduce generation of ghost images of the optical lens, and facilitate converging light entering the optical lens, and reduce a front aperture of the optical lens.
In some embodiments, the maximum field angle FOV of the optical lens satisfies: FOV is less than or equal to 120 degrees. The wide-angle detection method has the advantages that the wide-angle characteristic is favorably realized, more scene information can be acquired, and the requirement of large-range detection is met.
In some embodiments, the aperture value FNO of the optical lens satisfies: FNO is less than or equal to 2.20. The range is satisfied, the large aperture characteristic is favorably realized, and the image definition can be ensured in a low-light environment or at night.
In some embodiments, the incident angle CRA of the maximum field angle chief ray of the optical lens on the image plane satisfies: 20 DEG < CRA < 40 deg. Satisfying the above range, the allowable error value between the CRA of the optical lens and the CRA of the chip photosensitive element can be made larger, and the adaptability of the optical lens to the image sensor can be improved.
In some embodiments, the total optical length TTL and the effective focal length f of the optical lens satisfy: TTL/f is more than 1.6 and less than 1.9. The optical lens can effectively limit the length of the lens and realize the miniaturization of the optical lens.
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: TTL/IH is more than 0.7 and less than 0.9. The optical lens has the advantages that the range is met, the optical lens not only has large image plane characteristics, but also has light and thin characteristics, and the optical lens can be applied to portable electronic products.
In some embodiments, the optical back focus BFL and the effective focal length f of the optical lens satisfy: 0.2 < BFL/f. The method meets the range, is favorable for obtaining balance between good imaging quality and optical back focal length easy to assemble, and reduces the difficulty of the camera module assembly process while ensuring the imaging quality of the optical lens.
In some embodiments, the real image height IH of the optical lens corresponding to the maximum field angle and the entrance pupil diameter EPD satisfy: 4.5 < IH/EPD < 5.0. The width of the light ray bundle entering the optical lens can be increased, so that the brightness of the optical lens at the image surface is improved, and the dark corner is avoided.
In some embodiments, the effective focal length f, the maximum field angle FOV, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.6. Ltoreq. (IH/2)/(fXtan (FOV/2)). Satisfying the above range indicates that the optical distortion of the optical lens is better controlled, and the resolution of the optical lens is improved.
In some embodiments, the maximum field angle FOV of the optical lens, the first lens object side effective working aperture D 1 And the real image height IH corresponding to the maximum field angle satisfies the following conditions: d is more than 0.15 1 IH/tan (FOV/2) < 0.25. The optical lens has a large field angle and a large image plane, and the front end aperture is small.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the first lens are different 1 Satisfies the following conditions: -3.0 < f 1 And/f is less than-2.0. Satisfying the above range, the first lens can have a suitable negative refractive power, which is advantageous for increasing the field angle of the optical lens and realizing a wide-angle characteristic.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the second lens 2 Satisfies the following conditions: 1.0 < f 2 The/f is less than 2.0. The second lens has proper positive focal power, the light convergence capacity of the optical lens can be improved, and the total length of the optical lens is shortened; meanwhile, various aberrations of the first lens can be effectively balanced, 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 third lens are 3 Satisfies the following conditions: 1.0 < f 3 The/f is less than 1.5. The third lens has proper positive focal power, the light converging capability of the optical lens can be improved, and the total length of the optical lens can be shortened; meanwhile, the spherical aberration, the coma aberration and the field curvature generated by the third lens can be effectively balanced.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fourth lens are 4 Satisfies the following conditions: f is more than 0 4 The/f is less than 1.0. The fourth lens has proper positive focal power, the light converging capability of the optical lens can be improved, and the total length of the optical lens can be shortened.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fifth lens 5 Satisfies the following conditions: -1.0 < f 5 The/f is less than 0. The fifth lens has proper negative focal power and can increase the imaging area of the optical lens; meanwhile, various aberrations of the optical lens can be effectively balanced, 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 sixth lens element 6 Satisfies the following conditions: 1.5 < f 6 The/f is less than 2.5. The sixth lens has appropriate positive focal power, the light converging capability of the optical lens can be improved, and the total length of the optical lens can be shortened.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the seventh lens 7 Satisfies the following conditions: -1.5 < f 7 And/f < -1.0. The seventh lens has appropriate negative focal power and can increase the imaging area of the optical lens when the range is satisfied; meanwhile, astigmatism and field curvature of the optical lens can be effectively balanced, and imaging quality of the optical lens is improved.
In some embodiments, the first lens has a radius of curvature R of the object side surface 1 Radius of curvature R of image side 2 Satisfies the following conditions: 6.0 < (R) 1 +R 2 )/(R 1 -R 2 ) Is less than 8.0. The optical lens can ensure that the object side surface and the image side surface of the first lens have similar surface types, is favorable for reducing the spherical aberration and the field curvature of the first lens and improves the imaging quality of the optical lens.
In some embodiments, the object side rise Sag of the first lens 1 And light-passing semi-aperture d 1 Rise Sag of image side with first lens 2 And light passing semi-aperture d 2 Satisfies the following conditions: | Sag 1 /d 1 -Sag 2 /d 2 Less than 0.1. The optical lens meets the range, is favorable for the object side surface and the image side surface of the first lens to obtain similar surface types, is favorable for reducing the spherical aberration and the field curvature of the first lens, and improves the lightAnd the imaging quality of the optical lens.
In some embodiments, the effective focal length f of the optical lens is the distance CT on the optical axis between the first lens and the second lens 12 Satisfies the following conditions: f/CT of 5.0 < 12 Is less than 8.0. The range is met, the light focusing position after the light is reflected by the object side surface of the second lens is located behind the image side surface, the design ghost of the optical lens can be effectively improved, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens is equal to the distance CT on the optical axis between the fifth lens and the sixth lens 56 Satisfies the following conditions: f/CT of 5.0 < 56 Is less than 6.0. Satisfying the above range, can making the optical lens rear end have sufficient interval space to make the lens surface change degree of freedom higher, so as to promote optical lens's ability of correcting various aberrations.
In some embodiments, the center thickness CT of the first lens 1 Center thickness CT of the second lens 2 Satisfies the following conditions: 0.4 < CT 1 /CT 2 Is less than 0.5. The size of the front end of the optical lens can be effectively reduced, the adjustment of the optical structure of the optical lens is facilitated, and the processing and assembling difficulty of the lens is reduced.
In some embodiments, the total optical length TTL of the optical lens and the sum Σ CT of the central thicknesses of the first lens to the seventh lens along the optical axis, respectively, satisfy: 0.5 < ∑ CT/TTL. The optical lens structure meets the range, can effectively compress the total length of the optical lens, and is beneficial to the structural design and the production process of the optical lens.
In order to make the system have better optical performance, a plurality of aspheric lenses are adopted in the lens, and the surface shapes of the aspheric surfaces of the optical lens satisfy the following equation:
wherein z is the distance between the curved surface and the vertex of the curved surface in the direction of the optical axis, H is the distance between the optical axis and the curved surface, C is the curvature of the vertex of the curved surface, K is the coefficient of the quadric surface, and A, B, C, D, E, F, G, H, I and J are the coefficients of the second order, the fourth order, the sixth order, the eighth order, the tenth order, the twelfth order, the fourteenth order, the sixteenth order, the eighteenth order and the twentieth order.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
Example 1
Referring to fig. 1, a schematic structural diagram of an optical lens system according to embodiment 1 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: the lens includes a first lens L1, an aperture stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.
The first lens L1 has negative focal power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;
a diaphragm ST;
the second lens L2 has positive focal power, and both the object side surface S3 and the image side surface S4 are convex surfaces;
the third lens L3 has positive focal power, and both the object side surface S5 and the image side surface S6 are convex surfaces;
the fourth lens L4 has positive focal power, and both the object side surface S7 and the image side surface S8 are convex surfaces;
the fifth lens L5 has negative focal power, and both the object-side surface S9 and the image-side surface S10 are concave;
the sixth lens element L6 has positive focal power, and has a convex object-side surface S11 and a concave image-side surface S12;
the seventh lens L7 has negative power, and both the object-side surface S13 and the image-side surface S14 are concave;
the object side surface S15 and the image side surface S16 of the optical filter G1 are both planes;
the image formation surface S17 is a plane.
The relevant parameters of each lens in the optical lens in example 1 are shown in table 1-1.
TABLE 1-1
The parameters of the surface shape of the aspherical lens of the optical lens in example 1 are shown in table 1-2.
Tables 1 to 2
In the present embodiment, a field curvature graph, an F-tan θ distortion graph, a relative illumination graph, an MTF graph, an axial aberration graph, and a vertical axis chromatic aberration graph of the optical lens are respectively shown in fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, and fig. 7.
Fig. 2 shows a field curvature 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, with the horizontal axis indicating a shift amount (unit: mm) and the vertical axis indicating a half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.06mm, which indicates that the optical lens can correct the field curvature well.
Fig. 3 shows an F-tan θ distortion curve of example 1, which shows the F-tan θ distortion of light rays of different wavelengths at different image heights on an image forming plane, with the horizontal axis showing the F-tan θ distortion (unit:%) and the vertical axis showing the half field angle (unit:%). As can be seen from the figure, the F-tan theta distortion of the optical lens is controlled within +/-40%, which shows that the optical lens can better correct the F-tan theta distortion.
Fig. 4 shows a relative illuminance curve of example 1, which represents relative illuminance values at different angles of field of view on the imaging plane, with the horizontal axis representing the half field angle (unit: °), and the vertical axis representing the relative illuminance (unit:%). It can be seen from the figure that the relative luminance value of the optical lens is still greater than 30% at the maximum half field angle, which indicates that the optical lens has better relative luminance.
Fig. 5 shows MTF (modulation transfer function) graphs of embodiment 1, which represent the degree of modulation of lens imaging at different spatial frequencies for each field of view, with the horizontal axis representing the spatial frequency (unit: lp/mm) and the vertical axis representing the MTF value. As can be seen from the figure, the MTF value of the embodiment is 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 has good imaging quality and good detail resolution capability under the conditions of low frequency and high frequency.
Fig. 6 shows an axial aberration curve of example 1, which represents the aberration on the optical axis at the imaging plane for each wavelength, with the horizontal axis representing the axial aberration value (unit: μm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the shift amount of the axial aberration is controlled within ± 40 μm, which indicates that the optical lens can correct the axial aberration well.
Fig. 7 shows a vertical axis chromatic aberration curve of example 1, which shows chromatic aberration at different image heights on an image forming plane for each wavelength with respect to a center wavelength (0.55 μm), the horizontal axis shows a vertical axis chromatic aberration value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis shows a normalized angle of view. 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 the chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Example 2
Fig. 8 is a schematic structural view of an optical lens system according to embodiment 2 of the present invention, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: the lens includes a first lens L1, an aperture stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.
The first lens L1 has negative focal power, and the object side surface S1 of the first lens L is a convex surface, and the image side surface S2 of the first lens L is a concave surface;
a diaphragm ST;
the second lens L2 has positive focal power, and both the object side surface S3 and the image side surface S4 are convex surfaces;
the third lens L3 has positive focal power, and the object-side surface S5 is a concave surface, and the image-side surface S6 is a convex surface;
the fourth lens L4 has positive focal power, and both the object-side surface S7 and the image-side surface S8 are convex surfaces;
the fifth lens L5 has negative focal power, and both the object-side surface S9 and the image-side surface S10 are concave;
the sixth lens element L6 has positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12;
the seventh lens L7 has negative power, and both the object-side surface S13 and the image-side surface S14 are concave.
Relevant parameters of each lens in the optical lens in embodiment 2 are shown in table 2-1.
TABLE 2-1
The surface shape parameters of the aspherical lens of the optical lens in example 2 are shown in table 2-2.
Tables 2 to 2
In the present embodiment, a field curvature graph, an F-tan θ distortion curve, a relative illumination graph, an MTF graph, an axial aberration graph, and a vertical axis chromatic aberration graph of the optical lens are respectively shown in fig. 9, fig. 10, fig. 11, fig. 12, fig. 13, and fig. 14.
Fig. 9 shows a field curvature curve of example 2, which shows the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, with the horizontal axis representing the amount of displacement (unit: mm) and the vertical axis representing the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image plane and the sagittal image plane is controlled within +/-0.06 mm, which shows that the optical lens can excellently correct the field curvature.
Fig. 10 shows an F-tan θ distortion curve of example 2, which shows F-tan θ distortions at different image heights on an image forming plane for light rays of different wavelengths, with the abscissa representing the F-tan θ distortion (unit:%) and the ordinate representing the half field angle (unit: °). As can be seen from the figure, the F-tan theta distortion of the optical lens is controlled within +/-40%, which shows that the optical lens can better correct the F-tan theta distortion.
Fig. 11 shows a relative illuminance curve of example 2, which represents relative illuminance values at different angles of field of view on the imaging plane, with the horizontal axis representing the half field angle (unit: °), and the vertical axis representing the relative illuminance (unit:%). As can be seen from the figure, the relative luminance value of the optical lens is still greater than 30% at the maximum half field angle, which indicates that the optical lens has better relative luminance.
Fig. 12 shows MTF (modulation transfer function) graphs of embodiment 2, which represent the degree of modulation of lens imaging at different spatial frequencies for each field of view, with the horizontal axis representing the spatial frequency (unit: lp/mm) and the vertical axis representing the MTF value. As can be seen from the figure, the MTF value of the embodiment is 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 from the center to the edge field of view, and the image has better imaging quality and better detail resolution capability under the conditions of low frequency and high frequency.
Fig. 13 shows an axial aberration curve of example 2, which represents the aberration on the optical axis at the imaging plane for each wavelength, with the horizontal axis representing the axial aberration value (unit: μm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the shift amount of the axial aberration is controlled within ± 30 μm, which indicates that the optical lens can correct the axial aberration well.
Fig. 14 shows a vertical axis chromatic aberration curve of example 2, which shows chromatic aberration at different image heights on an image forming plane for each wavelength with respect to a center wavelength (0.55 μm), the horizontal axis shows a vertical axis chromatic aberration value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis shows a normalized angle of view. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-2 μm, which shows that the optical lens can excellently correct the chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Example 3
Fig. 15 is a schematic structural view of an optical lens system according to embodiment 3 of the present invention, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, an aperture stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.
The first lens L1 has negative focal power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;
a diaphragm ST;
the second lens L2 has positive focal power, and both the object side surface S3 and the image side surface S4 are convex surfaces;
the third lens L3 has positive focal power, and the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface;
the fourth lens L4 has positive focal power, and both the object-side surface S7 and the image-side surface S8 are convex surfaces;
the fifth lens L5 has negative focal power, and both the object side surface S9 and the image side surface S10 are concave surfaces;
the sixth lens element L6 has positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12;
the seventh lens L7 has negative power, and both the object-side surface S13 and the image-side surface S14 are concave.
Relevant parameters of each lens in the optical lens in embodiment 3 are shown in table 3-1.
TABLE 3-1
The surface shape parameters of the aspherical lens of the optical lens in example 3 are shown in table 3-2.
TABLE 3-2
In this embodiment, the curvature of field curve, F-tan θ distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are respectively shown in fig. 16, 17, 18, 19, 20, and 21.
Fig. 16 shows a field curvature 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, with the horizontal axis representing the amount of displacement (unit: mm) and the vertical axis representing the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image plane and the sagittal image plane is controlled within +/-0.08 mm, which shows that the optical lens can well correct the field curvature.
Fig. 17 shows an F-tan θ distortion curve of example 3, which shows F-tan θ distortions at different image heights on an image forming plane for light rays of different wavelengths, with the abscissa representing the F-tan θ distortion (unit:%) and the ordinate representing the half field angle (unit: °). As can be seen from the figure, the F-tan theta distortion of the optical lens is controlled within +/-40%, which shows that the optical lens can better correct the F-tan theta distortion.
Fig. 18 shows a relative illuminance curve of example 3, which represents relative illuminance values at different angles of field of view on the imaging plane, with the horizontal axis representing the half field angle (unit: °) and the vertical axis representing the relative illuminance (unit:%). As can be seen from the figure, the relative luminance value of the optical lens is still greater than 30% at the maximum half field angle, which indicates that the optical lens has better relative luminance.
Fig. 19 shows MTF (modulation transfer function) graphs of embodiment 3, which represent the degree of modulation of lens imaging at different spatial frequencies for each field of view, with the horizontal axis representing the spatial frequency (unit: lp/mm) and the vertical axis representing the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.3 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve uniformly and smoothly drops in the process of the field of view from the center to the edge, and the MTF has better imaging quality and better detail resolution capability under the conditions of low frequency and high frequency.
Fig. 20 shows an axial aberration curve of example 3, which represents the aberration on the optical axis at the imaging plane for each wavelength, with the horizontal axis representing the axial aberration value (unit: μm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the shift amount of the axial aberration is controlled within ± 30 μm, which indicates that the optical lens can correct the axial aberration well.
Fig. 21 shows a vertical axis chromatic aberration curve of example 3, which shows chromatic aberration at different image heights on an image forming plane for each wavelength with respect to a center wavelength (0.55 μm), the horizontal axis shows a vertical axis chromatic aberration value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis shows a normalized angle of view. 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 the chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Please refer to table 4, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, the total optical length TTL, the aperture FNO, the real image height IH, and the maximum field angle FOV of the optical lens, and the values corresponding to each conditional expression in the embodiments.
TABLE 4
In summary, the optical lens according to the embodiment of the invention realizes the advantages of large field of view, large aperture and miniaturization by reasonably matching the combination of the lens shape and the focal power between the lenses.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An optical lens system comprising seven lens elements, in order from an object side to an image plane along an optical axis:
a first lens element having a negative refractive power, the object-side surface of which is convex and the image-side surface of which is concave;
a diaphragm;
a second lens having a positive refractive power, both the object-side surface and the image-side surface of the second lens being convex;
the image side surface of the third lens is a convex surface;
a fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex;
a fifth lens element having a negative refractive power, both the object-side surface and the image-side surface of the fifth lens element being concave;
a sixth lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
a seventh lens element having a negative refractive power, wherein both the object-side surface and the image-side surface are concave;
the total optical length TTL and the effective focal length f of the optical lens meet the following conditions: TTL/f is more than 1.6 and less than 1.9.
2. The optical lens of claim 1, wherein the maximum field angle FOV of the optical lens satisfies: 120 degrees is less than or equal to FOV.
3. The optical lens of claim 1, wherein a total optical length TTL of the optical lens and a real image height IH corresponding to a maximum field angle satisfy: TTL/IH is more than 0.7 and less than 0.9.
4. The optical lens of claim 1, wherein an entrance pupil diameter EPD of the optical lens satisfies a real image height IH corresponding to a maximum field angle: 4.5 < IH/EPD < 5.0.
5. The optical lens according to claim 1, wherein the effective focal length f, the maximum field angle FOV and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.6. Ltoreq. (IH/2)/(fXtan (FOV/2)).
6. The method of claim 1The optical lens is characterized in that the maximum field angle FOV of the optical lens, the effective working caliber D1 of the object side surface of the first lens and the real image height IH corresponding to the maximum field angle satisfy the following conditions: d is more than 0.15 1 /IH/tan(FOV/2)＜0.25。
7. An optical lens barrel according to claim 1, wherein the radius of curvature R of the object side surface of the first lens 1 Radius of curvature R of image-side surface 2 Satisfies the following conditions: 6.0 < (R) 1 +R 2 )/(R 1 -R 2 )＜8.0。
8. An optical lens according to claim 1, characterized in that the first lens
Object lateral rise Sag 1 And light passing semi-aperture d 1 Rise Sag of image side with the first lens 2 And light passing semi-aperture d 2 Satisfies the following conditions: | Sag 1 /d 1 -Sag 2 /d 2 |＜0.1。
9. An optical lens according to claim 1, characterized in that the effective focal length f of the optical lens is the distance CT on the optical axis between the first lens and the second lens 12 Satisfies the following conditions: f/CT of 5.0 < 12 ＜8.0。
10. An optical lens according to claim 1, wherein a total optical length TTL of the optical lens and a sum Σ CT of central thicknesses of the first lens to the seventh lens along an optical axis, respectively, satisfy: 0.5 < ∑ CT/TTL.
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| CN117170069A (en) * | 2023-11-02 | 2023-12-05 | 江西联创电子有限公司 | optical lens |
| CN117930471A (en) * | 2024-03-22 | 2024-04-26 | 江西联益光学有限公司 | Optical lens |
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| US20220082793A1 (en) * | 2019-06-11 | 2022-03-17 | Ningbo Sunny Automotive Optech Co., Ltd | Optical lens assembly and imaging device |
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| US20190179122A1 (en) * | 2017-10-25 | 2019-06-13 | Zhejiang Sunny Optical Co., Ltd | Optical imaging lens assembly |
| US20220082793A1 (en) * | 2019-06-11 | 2022-03-17 | Ningbo Sunny Automotive Optech Co., Ltd | Optical lens assembly and imaging device |
| CN111708146A (en) * | 2020-06-12 | 2020-09-25 | 湖南长步道光学科技有限公司 | Projection lens and projector |
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| CN117930471B (en) * | 2024-03-22 | 2024-06-11 | 江西联益光学有限公司 | Optical lens |
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