CN115469439B - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN115469439B CN115469439B CN202211420983.5A CN202211420983A CN115469439B CN 115469439 B CN115469439 B CN 115469439B CN 202211420983 A CN202211420983 A CN 202211420983A CN 115469439 B CN115469439 B CN 115469439B
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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Abstract
The invention provides an optical lens, which comprises eight lenses, and is characterized in that the optical lens sequentially comprises the following components from an object side to an imaging surface along an optical axis: the image side surface of the first lens is a concave surface; the image side surface of the second lens is a convex surface; a diaphragm; the image side surface of the third lens is a convex surface; a fourth lens having an optical power; a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a sixth lens element having a positive refractive power, wherein both the object-side surface and the image-side surface are convex; a seventh lens element with a focal power, wherein the object-side surface of the seventh lens element is concave and the image-side surface of the seventh lens element is convex; an eighth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy that: IH/f is more than 1.7.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to an optical lens.
Background
With the development of automobile intellectualization, the assistant driving system of the vehicle is gradually improved, the vehicle-mounted lens is used as one of main tools for the assistant driving system to acquire external information, and the imaging quality of the vehicle-mounted lens directly influences the performance of the assistant driving system.
In order to accurately acquire external information, the onboard lens needs to be matched with a chip with a large size and a high resolution, and therefore the onboard lens needs to have a high resolution capability. In addition, in view of safety, the vehicle-mounted lens further needs to have high stability to adapt to various severe environments, and the problems that the imaging performance of the vehicle-mounted lens is reduced when the vehicle-mounted lens is used in different environments and the like are avoided.
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 image plane, a large field of view, a large aperture, and miniaturization.
In order to realize the purpose, the technical scheme of the invention is as follows:
an optical lens system comprising eight lenses, in order from an object side to an image plane along an optical axis:
the image side surface of the first lens is a concave surface;
the image side surface of the second lens is a convex surface;
a diaphragm;
the image side surface of the third lens is a convex surface;
a fourth lens having an optical power;
a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a sixth lens element having a positive refractive power, wherein both the object-side surface and the image-side surface are convex;
a seventh lens element with a focal power, wherein the object-side surface of the seventh lens element is concave and the image-side surface of the seventh lens element is convex;
an eighth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy the following conditions: IH/f is more than 1.7.
Preferably, the total optical length TTL and the effective focal length f of the optical lens satisfy: TTL/f is less than 5.0.
Preferably, the entrance pupil diameter EPD of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 2.6 < IH/EPD < 2.9.
Preferably, the effective focal length f of the optical lens and the focal length f of the third lens element 3 Satisfies the following conditions: f is more than 0 3 /f＜2.0。
Preferably, the effective focal length f of the optical lens and the focal length f of the fourth lens element 4 Satisfies the following conditions: 4.0 < | f 4 /f|。
Preferably, the effective focal length f of the optical lens and the focal length f of the seventh lens element 7 Satisfies the following conditions: 3.0 < | f 7 /f|。
Preferably, the effective focal length f of the optical lens and the combined focal length f of the first lens and the second lens are equal 12 Satisfies the following conditions: -2.0 < f 12 /f＜0。
Preferably, the effective focal length f of the optical lens and the focal length f of the fifth lens element 5 And a focal length f of the sixth lens 6 Satisfies the following conditions: -0.3 < (f) 5 +f 6 )/f＜0。
Preferably, the maximum field angle FOV of the optical lens, the real image height IH corresponding to the maximum field angle, and the object-side light-passing aperture D of the first lens 1 Satisfies the following conditions: d is more than 0.5 1 /IH/Tan(FOV/2)＜0.7。
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 eighth lens element along the optical axis satisfy: 0.6 <. Sigma CT/TTL < 0.8.
Compared with the prior art, the invention has the beneficial effects that: by reasonably matching the combination of the lens shape and the focal power among the lenses, the advantages of large image surface, large field of view, large aperture and miniaturization are realized.
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.
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 the F-Tan θ distortion of the optical lens in embodiment 1 of the present invention.
Fig. 4 is a graph showing a relative illuminance 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 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 field curvature graph of the optical lens in embodiment 2 of the present invention.
Fig. 10 is a graph showing the F-Tan θ distortion of the optical lens in embodiment 2 of the present invention.
Fig. 11 is a graph showing a relative illuminance of the optical lens in embodiment 2 of the present invention.
Fig. 12 is a MTF graph of the optical lens in embodiment 2 of the present invention.
Fig. 13 is a graph illustrating axial aberration of the optical lens in embodiment 2 of the present invention.
Fig. 14 is a vertical axis chromatic aberration diagram of the optical lens in embodiment 2 of the present invention.
Fig. 15 is a schematic structural diagram of an optical lens system according to embodiment 3 of the present invention.
Fig. 16 is a field curvature graph of the optical lens in embodiment 3 of the present invention.
Fig. 17 is a graph showing the F-Tan θ distortion of the optical lens in embodiment 3 of the present invention.
Fig. 18 is a graph showing a relative illuminance of the optical lens in embodiment 3 of the present invention.
Fig. 19 is a MTF graph of the optical lens in embodiment 3 of the present invention.
Fig. 20 is a graph showing axial aberration of the optical lens in 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.
Detailed Description
For a better understanding of the present invention, various aspects of the present invention will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is only illustrative of the embodiments of the invention and does not limit the scope of the invention 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 invention, "may" be used to mean "one or more embodiments of the present invention. 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 invention 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 may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
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 second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens.
In some embodiments, the first lens may have a negative power, which is beneficial for reducing the inclination angle of the incident light, thereby achieving effective sharing of a large field of view of the object. The image side surface of the first lens is a concave surface, so that light can be folded to avoid overlarge aperture of the lens behind the optical lens due to the fact that the light is excessively dispersed.
In some embodiments, the second lens element may have a positive focal power, which is advantageous for converging light rays and reducing the deflection angle of the light rays, so that the light rays are smoothly transited.
In some embodiments, the third lens element may have a positive focal power, which is advantageous for converging light rays and reducing the deflection angle of the light rays, so that the light rays are smoothly transitioned.
In some embodiments, the fifth lens element may have a negative focal power, which is beneficial to increase an imaging area of the optical lens and improve the imaging quality of the optical lens. The object side surface of the fifth lens is a convex surface, the image side surface of the fifth lens is a concave surface, so that the field curvature generated by the fifth lens can be reduced, and the light rays of the edge field of view can be converged, so that the converged light rays smoothly enter the rear-end optical system, and the relative illumination of the optical lens is improved.
In some embodiments, the sixth lens element may have a positive focal power, which is beneficial for converging light rays and reducing the deflection angle of the light rays, so that the light rays are in smooth transition. The object side surface and the image side surface of the sixth lens are convex surfaces, so that the spherical aberration generated by the sixth lens can be reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the object-side surface of the seventh lens element is a concave surface, and the image-side surface of the seventh lens element is a convex surface, so that the curvature of field generated by the seventh lens element itself can be reduced, and the light rays can be converged, thereby improving the imaging quality of the optical lens.
In some embodiments, the eighth lens element may have a negative refractive power, which is beneficial to increase an imaging area of the optical lens and improve the imaging quality of the optical lens. The object side surface of the eighth lens is a convex surface, the image side surface of the eighth lens is a concave surface, the angle of the marginal view field incident on the imaging surface can be suppressed, more light beams are effectively transmitted to the imaging surface, and the relative illumination of the optical lens is improved.
In some embodiments, the fifth lens and the sixth lens can be cemented to form a cemented lens, which can effectively correct chromatic aberration of the optical lens, reduce decentration sensitivity of the optical lens, balance aberration of the optical lens, and improve imaging quality of the optical lens; the assembly sensitivity of the optical lens can be reduced, the processing difficulty of the optical lens is further reduced, and the assembly yield of the optical lens is improved.
In some embodiments, a diaphragm for limiting the light beam may be disposed between the second lens and the third lens, and the diaphragm may be disposed near an object-side surface of the third lens, so as to reduce generation of ghost of the optical lens, and to facilitate converging light entering the optical system and reduce a rear aperture of the optical lens.
In some embodiments, the aperture ratio FNO of the optical lens satisfies: FNO is less than or equal to 1.64. 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 maximum field angle FOV of the optical lens satisfies: 100 < FOV. 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 incident angle CRA of the maximum field angle chief ray of the optical lens on the image plane satisfies: CRA < 12 DEG 8 deg. Satisfying above-mentioned scope, can making the tolerance error numerical value between CRA of optical lens and the CRA of chip photosensitive element great, promote optical lens to image sensor's adaptability.
In some embodiments, the total optical length TTL and the effective focal length f of the optical lens satisfy: TTL/f is less than 5.0. The optical lens can effectively limit the length of the lens and realize the miniaturization of the optical lens.
In some embodiments, the real image height IH corresponding to the maximum field angle and the effective focal length f of the optical lens satisfy: IH/f is more than 1.7. The optical lens satisfies the above range, and not only has large image plane characteristics, but also has good imaging quality.
In some embodiments, the optical back focus BFL of the optical lens and the effective focal length f satisfy: BFL/f is more than 0.6. 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: IH/EPD is more than 2.6 and less than 2.9. 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 incident angle CRA of the maximum field angle FOV and the maximum field angle chief ray of the optical lens on the image plane satisfies: 4.0 < (FOV/2)/CRA < 6.5. The wide-field optical lens has the advantages that the wide-field optical lens can realize large field of view, incident light can be emitted into the image sensor at a proper angle, the photosensitivity of the image sensor is improved, and the imaging quality of the optical lens is improved.
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 < (IH/2)/(f × Tan (FOV/2)). The method meets the range, is favorable for controlling the ideal image height to be close to the actual image height, and realizes small distortion.
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: -1.5 < f 1 The/f is less than 0. Satisfying above-mentioned scope, can making first lens have appropriate negative power, be favorable to incident light refraction angle change comparatively milder, avoid refraction change too strong and produce too much aberration, help more light to get into rear optical system simultaneously, increase the illumination and promote optical lens's image quality.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the second lens are different 2 Satisfies the following conditions: f is more than 3.0 2 And/f. Satisfying above-mentioned scope, can making the second lens have appropriate positive focal power, be favorable to assembling light and reduce light deflection angle simultaneously, let the light trend smooth transition, promote optical lens's the formation of image quality.
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: f is more than 0 3 The/f is less than 2.0. Satisfying above-mentioned scope, can making the third lens have appropriate positive focal power, be favorable to assembling light and reduce light deflection angle simultaneously, let the light trend smooth transition, promote optical lens's the formation of image quality.
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: 4.0 < | f 4 And/f |. The optical lens meets the range, can enable the fourth lens to have larger focal power, is favorable for the smooth transition of light trend, and improves the imaging quality of the optical lens.
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: -1.5 < f 5 The/f is less than 0. The fifth lens has proper negative focal power, so that various aberrations of the optical lens can be 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: f is more than 0 6 The/f is less than 1.5. The sixth lens has proper positive focal power, so that various aberrations of the optical lens can be 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 seventh lens 7 Satisfies the following conditions: 3.0 < | f 7 And/f |. Satisfying the above range, the seventh lens element can have a suitable focal power, which is beneficial to balance astigmatism of the optical lens and improve the imaging quality of the optical lens.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the eighth lens element 8 Satisfies the following conditions: -9.0 < f 8 And/f is less than-2.0. Satisfying the above range, the eighth lens can have a proper negative focal power, which is beneficial to balance the coma, astigmatism and field curvature of the optical lens, and improves the imaging quality of the optical lens.
In some embodiments, the effective focal length f of the optical lens and the combined focal length f of the first and second lenses 12 Satisfies the following conditions: -2.0 < f 12 The/f is less than 0. Satisfying the above range by appropriately distributing the first lens and the second lensThe focal length of the lens is beneficial to balancing various aberrations, 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 fifth lens 5 And focal length f of the sixth lens 6 Satisfies the following conditions: -0.3 < (f) 5 +f 6 ) The/f is less than 0. The chromatic aberration correction method meets the range, is favorable for correcting chromatic aberration of the optical lens, and improves imaging quality of the optical lens.
In some embodiments, 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: -16.0 < R 1 /R 2 < -6.0. The optical lens meets the range, the object side surface of the first lens can obtain a larger curvature radius, the influence on the distortion of the optical lens is reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the maximum field angle FOV of the optical lens, the real image height IH corresponding to the maximum field angle, and the first lens object-side clear aperture D 1 Satisfies the following conditions: d is more than 0.5 1 the/IH/Tan (FOV/2) < 0.7. The optical lens has a large field angle and a large image plane, and the front port diameter is small, so that the optical lens is miniaturized.
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 element to the eighth lens element along the optical axis respectively satisfy: 0.6 <. Sigma CT/TTL < 0.8. 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 optical axis direction, 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 are the coefficients of the second order, the fourth order, the sixth order, the eighth order, the tenth order and the twelfth order curved surface respectively.
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: a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.
The first lens L1 has negative focal power, and both the object side surface S1 and the image side surface S2 are concave surfaces;
the second lens L2 has positive focal power, and both the object side surface S3 and the image side surface S4 are convex surfaces;
a diaphragm ST;
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 negative focal power, and the object-side surface S7 is a convex surface and the image-side surface S8 is a concave surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a concave object-side surface S13 and a convex image-side surface S14;
the eighth lens element L8 has a negative refractive power, and has a convex object-side surface S15 and a concave image-side surface S16;
the optical filter G1 is provided with a plane object side surface S17 and a plane image side surface S18;
the imaging surface S19 is a plane;
the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.
Relevant parameters of each lens in the optical lens in embodiment 1 are shown in table 1-1.
TABLE 1-1
The surface shape parameters of the aspherical lens of the optical lens in example 1 are shown in table 1-2.
Tables 1 to 2
Fig. 2 shows a field curvature graph of example 1, 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 ± 0.06mm, which indicates that the optical lens can correct the field curvature well.
Fig. 3 shows a F-Tan θ distortion graph of example 1, which shows the F-Tan θ distortion at different image heights on the image forming plane for light rays of different wavelengths, 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 correct the F-Tan theta distortion well.
Fig. 4 shows a relative illuminance graph of example 1, which represents relative illuminance values at different angles of field of view on an imaging plane, with the horizontal axis representing a half field angle (unit: °) and the vertical axis representing relative illuminance (unit:%). As can be seen from the figure, the relative illuminance value of the optical lens at the maximum half field angle is still greater than 70%, indicating that the optical lens has good relative illuminance.
Fig. 5 shows a Modulation Transfer Function (MTF) graph of embodiment 1, which represents the degree of modulation of lens imaging representing 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 present 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 dropped in the process from the center to the edge field of view, and the image quality and the detail resolution are good in both the low frequency and the high frequency.
Fig. 6 shows an axial aberration graph 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 amount of shift of the axial aberration is controlled within ± 10 μm, indicating that the optical lens can excellently correct the axial aberration.
Fig. 7 is a vertical axis chromatic aberration graph 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), and 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 +/-3 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
Referring to fig. 8, a schematic structural diagram of an optical lens system according to embodiment 2 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.
The first lens L1 has negative focal power, and the object side surface S1 and the image side surface S2 are both concave surfaces;
the second lens L2 has positive focal power, and both the object side surface S3 and the image side surface S4 are convex surfaces;
a diaphragm ST;
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 negative focal power, and the object-side surface S7 is a convex surface and the image-side surface S8 is a concave surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has positive refractive power, and has a concave object-side surface S13 and a convex image-side surface S14;
the eighth lens element L8 has negative refractive power, and has a convex object-side surface S15 and a concave image-side surface S16;
the optical filter G1 is provided with a plane object side surface S17 and a plane image side surface S18;
the imaging surface S19 is a plane;
the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.
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
Fig. 9 shows a field curvature graph 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 indicates that the optical lens can well correct the field curvature.
Fig. 10 shows a F-Tan θ distortion graph of example 2, which shows the F-Tan θ distortion of light rays of different wavelengths at different image heights on an image forming surface, 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 correct the F-Tan theta distortion well.
Fig. 11 shows a relative illuminance graph of example 2, which represents relative illuminance values at different angles of field of view on an imaging plane, with the horizontal axis representing a half field angle (unit: °) and the vertical axis representing relative illuminance (unit:%). As can be seen from the figure, the relative illuminance value of the optical lens at the maximum half field angle is still greater than 70%, indicating that the optical lens has good relative illuminance.
Fig. 12 shows a Modulation Transfer Function (MTF) graph of embodiment 2, which represents the degree of modulation of lens imaging representing 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 is uniformly and smoothly reduced in the process from the center to the edge field of view, and the image quality and the detail resolution capability are better under the conditions of low frequency and high frequency.
Fig. 13 shows an axial aberration graph 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 amount of shift of the axial aberration is controlled within ± 10 μm, indicating that the optical lens can excellently correct the axial aberration.
Fig. 14 is a vertical axis chromatic aberration graph 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), and 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 +/-3 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 3
Referring to fig. 15, a schematic structural diagram of an optical lens system according to embodiment 3 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, 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;
the second lens L2 has positive focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
a diaphragm ST;
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 the object side surface S7 is a concave surface, and the image side surface S8 is a convex surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has positive refractive power, and has a concave object-side surface S13 and a convex image-side surface S14;
the eighth lens element L8 has negative refractive power, and has a convex object-side surface S15 and a concave image-side surface S16;
the optical filter G1 is provided with a plane object side surface S17 and a plane image side surface S18;
the imaging surface S19 is a plane;
the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.
The relevant parameters of each lens in the optical lens in example 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
Fig. 16 shows a field curvature graph 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 +/-0.04 mm, which shows that the optical lens can excellently correct the field curvature.
Fig. 17 shows a F-Tan θ distortion graph of example 3, which shows the F-Tan θ distortion at different image heights on the image forming plane for light rays of different wavelengths, 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 correct the F-Tan theta distortion well.
Fig. 18 shows a graph of relative illuminance for example 3, which represents relative illuminance values for 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 illuminance value of the optical lens at the maximum half field angle is still greater than 70%, indicating that the optical lens has good relative illuminance.
Fig. 19 shows a Modulation Transfer Function (MTF) graph of embodiment 3, which represents the lens imaging modulation degree representing 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 present embodiment is above 0.5 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly dropped in the process from the center to the edge field of view, and the image quality and the detail resolution are excellent in both the low frequency and the high frequency.
Fig. 20 shows an axial aberration graph 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 amount of shift of the axial aberration is controlled within ± 10 μm, indicating that the optical lens can excellently correct the axial aberration.
Fig. 21 is a vertical axis chromatic aberration graph 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), and in which 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.
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 factor FNO, the real image height IH, the field angle FOV, and the values corresponding to each conditional expression in the embodiments.
TABLE 4
In summary, the optical lens of the embodiment of the invention realizes the advantages of large image plane, large field of view, large aperture and miniaturization by reasonably matching the combination of the lens shape and the focal power among the lenses.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like 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 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-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An optical lens system comprising eight lenses, in order from an object side to an image plane along an optical axis:
the image side surface of the first lens is a concave surface;
the image side surface of the second lens is a convex surface;
a diaphragm;
the image side surface of the third lens is a convex surface;
a fourth lens having an optical power;
a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a sixth lens element having a positive refractive power, wherein both the object-side surface and the image-side surface are convex;
a seventh lens element with a focal power, wherein the object-side surface of the seventh lens element is concave and the image-side surface of the seventh lens element is convex;
an eighth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy that: IH/f is more than 1.7;
an effective focal length f of the optical lens and a focal length f of the fourth lens 4 Satisfies the following conditions: 4.0 < | f 4 /f|。
2. The optical lens assembly as claimed in claim 1, wherein the total optical length TTL and the effective focal length f of the optical lens assembly satisfy: TTL/f is less than 5.0.
3. 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: IH/EPD is more than 2.6 and less than 2.9.
4. An optical lens according to claim 1, characterized in that the effective focal length f of the optical lens and the focal length f of the third lens are 3 Satisfies the following conditions: f is more than 0 3 /f＜2.0。
5. 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: -16.0 < R 1 /R 2 ＜-6.0。
6. An optical lens according to claim 1, characterized in that the effective focal length f of the optical lens and the focal length f of the seventh lens 7 Satisfies the following conditions: 3.0 < | f 7 /f|。
7. An optical lens according to claim 1, characterized in that the effective focal length f of the optical lens and the combined focal length f of the first and second lens are such that 12 Satisfies the following conditions: -2.0 < f 12 /f＜0。
8. An optical lens according to claim 1, characterized in that the effective focal length f of the optical lens and the focal length f of the fifth lens 5 And a focal length f of the sixth lens 6 Satisfies the following conditions: -0.3 < (f) 5 +f 6 )/f＜0。
9. The optical lens according to claim 1, wherein the maximum field angle FOV, the real image height IH corresponding to the maximum field angle and the object-side aperture D of the first lens are the same as each other 1 Satisfies the following conditions: d is more than 0.5 1 /IH/Tan(FOV/2)＜0.7。
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 eighth lens along an optical axis, respectively, satisfy: 0.6 <. Sigma CT/TTL < 0.8.
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