CN116643384B - Optical system, lens module and electronic equipment - Google Patents
Optical system, lens module and electronic equipment Download PDFInfo
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- CN116643384B CN116643384B CN202310927698.0A CN202310927698A CN116643384B CN 116643384 B CN116643384 B CN 116643384B CN 202310927698 A CN202310927698 A CN 202310927698A CN 116643384 B CN116643384 B CN 116643384B
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Classifications
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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
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
- G02B13/146—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
An optical system, a lens module and an electronic device, wherein the optical system has six lens elements with refractive power, the object side surface and the image side surface of the first lens element and the third lens element are spherical surfaces, and the fourth lens element and the fifth lens element are cemented lenses; the optical system satisfies the relation: 6.8< tan (HFOV)/FNO <8.2; where FNO is the f-number of the optical system and HFOV is half the maximum field angle of the optical system. The optical system can meet the characteristics of a large field angle and a large aperture.
Description
Technical Field
The present application relates to the field of optical imaging technology, and in particular, to an optical system, a lens module, and an electronic device.
Background
With the popularization of automobile intellectualization, an on-board lens is used as a tool for providing intelligent assistance for automobiles, and the on-board lens is also widely applied to automobiles. However, unlike the conventional optical lens, the on-vehicle lens is required to have a larger angle of view and a larger aperture in order to capture more environmental details, so that the lens can be suitable for low-light environments in daytime and nighttime, thereby capturing clearer images. It becomes critical how to provide an optical system with a large field angle and a large aperture.
Disclosure of Invention
The application aims to provide an optical system, a lens module and electronic equipment, wherein the optical system can meet the characteristics of large field angle and large aperture.
In order to achieve the purpose of the application, the application provides the following technical scheme:
in a first aspect, the present application provides an optical system having six lens elements with refractive power, including, in order from an object side to an image side in an optical axis direction: the first lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the third lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the fourth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the fifth lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the sixth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; wherein the object side surface and the image side surface of the first lens and the third lens are spherical surfaces; the optical system satisfies the relation: 6.8< tan (HFOV)/FNO <8.2; wherein FNO is the f-number of the optical system and HFOV is half the maximum field angle of the optical system.
In the optical system provided by the application, the configuration mode of the first lens is beneficial to increasing the angle of view and simultaneously improving the relative illuminance of the edge view field of the optical system as much as possible, so that the occurrence of a dark angle is effectively avoided; the configuration mode of the second lens is beneficial to slowing down the refractive intensity of light entering the optical system, so that the light is more gentle, and the optical imaging quality is improved; the configuration mode of the third lens can effectively receive the large-angle light rays from the first lens and the second lens and can also reduce the field curvature astigmatism of the optical system; the configuration mode of the fourth lens and the fifth lens can effectively reduce the chromatic aberration of the optical system and improve the imaging quality of the optical system; the sixth lens is configured to further correct curvature of field and astigmatism of the optical system, and better match an incidence angle of chief ray on an imaging surface of the optical system, thereby preventing color cast.
When the relation is satisfied, the aperture and the field angle of the optical system can be reasonably configured, so that the characteristics of large field angle and large aperture are satisfied, the optical system can have day-night confocal function, and clear imaging can be performed at night or when the ambient brightness is low.
In a second aspect, the present application further provides a lens module, where the lens module includes the optical system of any one of the embodiments of the first aspect and a photosensitive chip, and the photosensitive chip is disposed on an image side of the optical system. By adopting the optical system, the lens module can have the characteristics of large field angle and large aperture, so the lens module can have day-night confocal function, and can also perform clear imaging at night or when the ambient brightness is low.
In a third aspect, the present application further provides an electronic device, where the electronic device includes a housing and the lens module of the second aspect, and the lens module is disposed in the housing. When the lens module is adopted, the electronic equipment can have the characteristics of large field angle and large aperture, so the electronic equipment can have day-night confocal function, and can perform clear imaging at night or when the ambient brightness is low.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an optical system of a first embodiment;
fig. 2 is an aberration diagram of the optical system of the first embodiment;
fig. 3 is a schematic structural view of an optical system of a second embodiment;
fig. 4 is an aberration diagram of the optical system of the second embodiment;
fig. 5 is a schematic structural view of an optical system of a third embodiment;
fig. 6 is an aberration diagram of the optical system of the third embodiment;
fig. 7 is a schematic structural view of an optical system of a fourth embodiment;
fig. 8 is an aberration diagram of the optical system of the fourth embodiment;
fig. 9 is a schematic structural view of an optical system of a fifth embodiment;
fig. 10 is an aberration diagram of the optical system of the fifth embodiment;
FIG. 11 is a schematic diagram of a lens module according to an embodiment of the application;
fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.
In a first aspect, the present application provides an optical system having six lens elements with refractive power, including, in order from an object side to an image side in an optical axis direction: the first lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the third lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the fourth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the fifth lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the sixth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the object side surface and the image side surface of the first lens and the third lens are spherical surfaces; the optical system satisfies the relation: 6.8< tan (HFOV)/FNO <8.2; where FNO is the f-number of the optical system and HFOV is half the maximum field angle of the optical system.
In the optical system provided by the application, the configuration mode of the first lens is beneficial to increasing the angle of view and simultaneously improving the relative illuminance of the edge view field of the optical system as much as possible, so that the occurrence of a dark angle is effectively avoided; the second lens is configured in such a way that the refractive power in the optical system can be moved towards the object side, which is favorable for slowing down the refractive strength of light entering the optical system, so that the light is more gentle, and the optical imaging quality is improved; the configuration mode of the third lens can ensure the temperature drift of the optical system, so that the optical system has better imaging quality at the low temperature of-40 ℃ to the high temperature of 80 ℃; the configuration mode of the fourth lens and the fifth lens is matched with proper lens materials, so that the chromatic aberration of the optical system can be effectively reduced, and the imaging quality of the optical system is improved; the sixth lens is configured to further correct curvature of field and astigmatism of the optical system, and better match an incidence angle of chief ray on an imaging surface of the optical system, thereby preventing color cast.
Alternatively, the TAN (HFOV)/FNO values may be 6.819, 7.02, 7.243, 7.461, 7.462, 7.621, 7.809, 8.031, 8.166, 8.191. When the relation is satisfied, the aperture and the field angle of the optical system can be reasonably configured, so that the characteristics of large field angle and large aperture are satisfied, the optical system can have day-night confocal function, and clear imaging can be performed at night or when the ambient brightness is low.
In one embodiment, -1.78 < R1/R3 < -1.6; wherein, R1 is a radius of curvature of the object side surface of the first lens element at the optical axis, and R3 is a radius of curvature of the object side surface of the second lens element at the optical axis. Specifically, the values of R1/R3 may be-1.7799, -1.7601, -1.7469, -1.7325, -1.7149, -1.6832, -1.6632, -1.6361, -1.6091, -1.6001.
When the relation is satisfied, the ghost image risk caused by reflection between the object side surface and the image side surface of the second lens is reduced, the incidence light inclination angle of the optical system can be effectively reduced, and light smoothly enters the following lens. When the range of the relation is exceeded, the curvature radius of the object side surfaces of the first lens and the second lens is too large or too small, so that the adjustment of light rays entering the optical system and the reduction of ghost images are not facilitated, the preparation difficulty of the lenses is increased, and the yield is reduced.
In one embodiment, the optical system satisfies the relationship: 1< SD1/Imgh <1.25; SD1 is half of the maximum effective aperture of the object side surface of the first lens, and Imgh is half of the maximum angle of view of the optical system corresponding to the image height. Specifically, the SD1/Imgh values may be 1.0001, 1.0588, 1.1145, 1.1538, 1.1665, 1.2145, 1.2232, 1.2265, 1.2353, 1.2499.
Since the first lens mainly plays a role of converging light, the larger the caliber of the first lens is, the better the light receiving effect is, but the larger caliber can increase the overall size of the lens. Therefore, when the above-described relational expression is satisfied, the aperture of the first lens and the image height of the optical system can be ensured to be within a proper range, and the aperture of the first lens can be controlled so that the illuminance, the angle of view, and the size are balanced. When the range of the relation is exceeded, the aperture of the first lens or the image height of the optical system exceeds the range defined by the relation, so that the overall size of the optical system may be excessively large or the imaging quality may be poor.
In one embodiment, the optical system satisfies the relationship: 0.2< SAG52/CT3<0.43; the SAG52 is the distance from the intersection point of the image side surface of the fifth lens element and the optical axis to the maximum effective aperture of the image side surface of the fifth lens element in the direction parallel to the optical axis, i.e. the sagittal height, and CT3 is the thickness of the third lens element at the optical axis. Specifically, the SAG52/CT3 value may be: 0.2005, 0.2393, 0.2554, 0.2856, 0.3254, 0.3754, 0.3934, 0.4025, 0.4131, 0.4299.
When the relational expression is satisfied, the temperature drift of the system can be better corrected, so that the system can work stably within the range of-40 ℃ to 85 ℃. When the upper limit of the relation is exceeded, the rise of the image side surface of the fifth lens is too large, and when the ambient temperature is higher, the rise of the fifth lens is changed greatly, so that the fifth lens is easy to squeeze the lens barrel, and the imaging performance is influenced; when the thickness of the third lens element is smaller than the lower limit of the relation, the thickness of the third lens element on the optical axis is too large, which is disadvantageous for realizing the weight reduction of the optical system.
In one embodiment, the optical system satisfies the relationship: -2.3mm -1 ＜R7/（R9×R10）＜-1.2mm -1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein R7 is a radius of curvature of the object side surface of the fourth lens element at the optical axis, R9 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, and R10 is a radius of curvature of the image side surface of the fifth lens element at the optical axis. Specifically, the value of R7/(r9×r10) may be: -2.2838, -2.2002, -2.0443, -1.8215, -1.6572, -1.4485, -1.3453, -1.2928, -1.2445, -1.2012.
When the above relation is satisfied, the surface shapes of the fourth lens and the fifth lens can be reasonably configured, and on the premise of ensuring the processability of the fourth lens and the fifth lens, each aberration of the optical system is better corrected by the surface shape matching of the fourth lens and the fifth lens, so that the imaging quality is ensured.
In one embodiment, the optical system satisfies the relationship: R11/R12 is more than 1.22 and less than 1.72; wherein R11 is a radius of curvature of the object side surface of the sixth lens element at the optical axis, and R12 is a radius of curvature of the image side surface of the sixth lens element at the optical axis. Specifically, the value of R11/R12 may be: 1.2316, 1.2591, 1.3533, 1.3832, 1.4533, 1.4912, 1.5531, 1.6451, 1.6913, 1.7130.
When the relation is satisfied, the surface shape of the sixth lens can be reasonably configured, and the thickness and the decentering sensitivity of the optical system can be effectively controlled while the processability of the sixth lens is ensured; the comprehensive yield of the optical system in the visible infrared confocal system can be further improved by matching with the parameter design of other lenses.
In one embodiment, the optical system satisfies the relationship: 6< H62/SAG62<9.5; the SAG62 is a distance from an intersection point of the image side surface of the sixth lens element and the optical axis to a direction parallel to the optical axis, i.e., a sagittal height, where H62 is a perpendicular distance from a maximum sagittal height of the image side surface of the sixth lens element to the optical axis. Specifically, the value of H62/SAG62 may be: 6.2121, 6.6094, 7.0447, 7.4413, 7.7808, 8.1972, 8.4237, 8.9123, 9.3337, 9.4632.
The image side surface of the sixth lens and the optical filter are relatively close to each other due to structural limitation, and ghosting can occur in the imaging effect under the condition that the lens is curved reversely. When the relation is satisfied, the maximum sagittal caliber slope of the sixth lens can be ensured to be in a proper range, and the risk of ghost images between the sixth lens and the optical filter is effectively reduced.
In one embodiment, the fourth lens and the fifth lens are cemented lenses, and the optical system satisfies the relation: 0.15 < | (f3×f45)/(f1×f6) | < 0.52; wherein f1 is the focal length of the first lens, f3 is the focal length of the third lens, f45 is the combined focal length of the fourth lens and the fifth lens, and f6 is the focal length of the sixth lens. Specifically, the value of | (f3×f45)/(f1×f6) | may be: 0.1504, 0.1634, 0.1728, 0.2098, 0.2892, 0.3277, 0.3727, 0.4845, 0.5102, 0.5199.
When the relation is satisfied, the focal length of the lens can be reasonably configured, and the refractive power of the lens can be kept in a proper range, so that the imaging quality of the optical system can be improved, and the optical system can be ensured to have a larger depth of field range.
In one embodiment, the optical system satisfies the relationship: -2.2mm -1 <R3/（SAG31×CT2）<-1.85mm -1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein SAG31 is the distance from the intersection point of the object side surface of the third lens element and the optical axis to the direction parallel to the optical axis of the maximum effective aperture of the object side surface of the third lens element, R3 is the radius of curvature of the object side surface of the second lens element at the optical axis, and CT2 is the thickness of the second lens element at the optical axis. Specifically, the value of R3/(SAG 31×ct2) may be: -2.1678, -2.0942, -2.0341, -1.9934, -1.9594, -1.9404, -1.9291, -1.8992, -1.8785, -1.8504.
When the relation is satisfied, the curvature radius of the object side surface of the second lens, the thickness of the second lens and the maximum sagittal height of the third lens can be reasonably configured, so that the situation that the manufacturing difficulty of the lens is increased due to overlarge center thickness of the second lens or overlarge object side surface of the second lens is avoided, the forming yield of the second lens is further improved, and the production cost is reduced.
In one embodiment, the optical system satisfies the relationship: 35< |Vd5-Vd4| <36; where Vd5 is the abbe number of the fifth lens and Vd4 is the abbe number of the fourth lens. Specifically, the value of Vd5-Vd4 may be: 35.5990, 35.3097, 35.58, 35.3287, 35.599.
When the relation is satisfied, chromatic aberration of the optical system can be effectively corrected, especially for an infrared confocal system, infrared defocus can be effectively reduced, and imaging performance of the system in visible and infrared wavelength ranges is improved.
In one embodiment, the optical system satisfies the relationship: 80deg < HFOV <90deg; wherein the HFOV is one half of the maximum field angle of the optical system. The values for the HFOV may be: 80.1, 85.1, 85.5, 86, 86.5, 87, 87.5, 87.9, 89.7.
When the relation is satisfied, the optical system has the characteristic of large field angle, so that a large-range object space scene can be shot, the shooting dead angle is effectively reduced, and the optical system can be effectively applied to equipment with large requirements on the field range such as vehicle-mounted equipment, monitoring equipment, security equipment and the like.
In one embodiment, the optical system satisfies the relationship: FNO is more than or equal to 2 and less than or equal to 2.2; wherein FNO is the f-number of the optical system. The value of FNO may be: 2. 2.02, 2.05, 2.08, 2.1, 2.12, 2.15, 2.18, 2.2.
When the relation is satisfied, the optical system has a larger light-transmitting aperture, so that the light-entering quantity of the optical system is increased, the illumination of an imaging surface can be improved, and the imaging resolution is improved.
In one embodiment, at least one lens in the optical system may have a spherical surface shape, and the design of the spherical surface shape may reduce the difficulty of manufacturing the lens and reduce the manufacturing cost. In other embodiments, at least one lens of the optical system may also have an aspherical surface type, and when at least one side surface (object side surface or image side surface) of the lens is aspherical, the lens may be said to have an aspherical surface type. In other embodiments, both the object side and the image side of each lens may be designed to be aspheric. The aspheric design can help the optical system 10 to more effectively eliminate aberrations and improve imaging quality. In some embodiments, in order to achieve the advantages of manufacturing cost, manufacturing difficulty, imaging quality, assembly difficulty, etc., the design of each lens surface in the optical system may be composed of spherical and aspherical surface patterns.
In one embodiment, at least one lens in the optical system is made of Glass (GL, glass). For example, the first lens closest to the object side is made of glass, and the influence of the environmental temperature change on the optical system can be effectively reduced by utilizing the temperature eliminating and floating effect of the glass material of the first lens, so that better and stable imaging quality is maintained. In other embodiments, the material of at least one lens in the optical system may also be Plastic (PC), and the Plastic material may be polycarbonate, gum, or the like. The lens with plastic material can reduce the production cost of the optical system, while the lens with glass material can endure higher or lower temperature and has excellent optical effect and better stability. In other embodiments, lenses of different materials may be disposed in the optical system, i.e. a combination of glass lenses and plastic lenses may be used, but the specific configuration relationship may be determined according to practical requirements, which is not meant to be exhaustive.
In a second aspect, the present application further provides a lens module, where the lens module includes the optical system of any one of the embodiments of the first aspect and a photosensitive chip, and the photosensitive chip is disposed on an image side of the optical system. By adopting the optical system, the lens module can have the characteristics of large field angle and large aperture, so the lens module can have day-night confocal function, and can also perform clear imaging at night or when the ambient brightness is low.
In a third aspect, the present application further provides an electronic device, where the electronic device includes a housing and the lens module of the second aspect, and the lens module is disposed in the housing. When the lens module is adopted, the electronic equipment can have the characteristics of large field angle and large aperture, so the electronic equipment can have day-night confocal function, and can perform clear imaging at night or when the ambient brightness is low.
First embodiment
Referring to fig. 1 and 2, the optical system 10 of the present embodiment includes, in order from an object side to an image side:
the first lens element L1 with negative refractive power has a convex object-side surface S1 and a concave image-side surface S2 at a paraxial region.
The second lens element L2 with negative refractive power has a concave object-side surface S3 and a convex image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has a convex object-side surface S5 and a convex image-side surface S6 at a paraxial region.
The fourth lens element L4 with negative refractive power has a convex object-side surface S7 and a concave image-side surface S8 at a paraxial region.
The fifth lens element L5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10 at a paraxial region.
The sixth lens element L6 with negative refractive power has a convex object-side surface S11 and a concave image-side surface S12 at a paraxial region.
The fourth lens element L4 and the fifth lens element L5 are cemented lenses, i.e., an image-side surface S8 of the fourth lens element L4 is coupled with an object-side surface S9 of the fifth lens element L5. The first lens L1 and the third lens L3 are made of glass, and the rest lenses are made of plastic.
Further, the optical system 10 includes a stop STO, an optical filter IR, a cover glass CG, and an imaging plane IMG. A stop STO is provided on the object side surface S7 of the fourth lens L4 for controlling the amount of light entering.
The filter IR comprises an object side surface S13 facing the sixth lens L6; the cover glass CG includes an image side surface S14 facing the image plane IMG. The effective pixel area of the photosensitive chip is positioned on the imaging surface IMG.
The filter IR may be a two-pass filter, and is disposed between the sixth lens L6 and the cover glass CG. The dual pass filter passes infrared light or visible light. In practical application, the infrared light channel and the visible light channel can be set according to the illumination condition of the environment, wherein when the illumination condition is brighter (for example, in the daytime or in other environments with stronger illumination intensity), the visible light channel is adopted to be matched with the optical system 10, and the visible light channel can pass through the visible light, so that the optical system 10 can acquire images with better imaging quality under the condition of brighter illumination condition; when the illumination condition is darker (for example, in dark night, underground parking, tunnel, etc., or in other environments with weaker illumination intensity), the infrared light channel is adopted to be used together with the optical system 10, and the infrared light channel can pass through the infrared light, so that the optical system 10 can acquire images with better imaging quality under the condition of darker illumination condition. The infrared light channel and the visible light channel are respectively matched with the optical system 10, so that the optical system 10 has good imaging effects in the visible light and infrared light bands at the same time, and the optical system 10 has the function of day-night sharing. Table 1a shows a characteristic table of the optical system 10 of the present embodiment, and the radius Y in table 1a is the radius of curvature of the object side surface or the image side surface of the corresponding surface number at the optical axis 101. The surface numbers S1 and S2 are the object side surface S1 and the image side surface S2 of the first lens element L1, respectively, i.e., the surface with the smaller surface number is the object side surface and the surface with the larger surface number is the image side surface in the same lens element. The first value in the "thickness" parameter row of the first lens element L1 is the thickness of the lens element on the optical axis 101, and the second value is the distance from the image side surface of the lens element to the subsequent optical surface (the object side surface or stop surface of the subsequent lens element) on the optical axis 101. The units of Y radius, thickness and focal length are millimeters (mm).
TABLE 1a
As shown in table 1a, EFL is an effective focal length of the optical system 10, FNO is an f-number of the optical system 10, HFOV is a half of a maximum field angle of the optical system 10, and TTL is a distance between the object side surface S1 of the first lens L1 and the imaging surface IMG of the optical system 10 on the optical axis 101.
In the present embodiment, the first lens L1 and the third lens L3 are spherical lenses; the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are aspherical lenses. The aspherical surface profile x may be defined using, but not limited to, the following aspherical formula:
where x is the distance from the corresponding point on the aspheric surface to the plane tangential to the on-axis vertex, h is the distance from the corresponding point on the aspheric surface to the optical axis 101, c is the curvature of the aspheric vertex, k is the conic coefficient, ai is the coefficient corresponding to the i-th higher term in the aspheric surface formula. Table 1b shows the higher order coefficients k, A4, A6, A8, a10 and a12 that can be used for the aspherical mirror in the first embodiment.
TABLE 1b
Fig. 2 (a) shows a longitudinal spherical aberration diagram of the optical system of the first embodiment at wavelengths of 940.0000nm, 656.000nm, 610.000nm, 555.0000nm, 510.0000nm, 470.0000nm and 435.0000nm, wherein the abscissa along the X-axis direction represents focus offset in mm, the ordinate along the Y-axis direction represents normalized field of view, and the longitudinal spherical aberration diagram represents convergent focus offset of light rays of different wavelengths after passing through each lens of the optical system. As can be seen from fig. 2 (a), the spherical aberration value of the optical system in the first embodiment is better, which indicates that the imaging quality of the optical system in the present embodiment is better.
Fig. 2 (b) also shows an astigmatic diagram of the optical system of the first embodiment at a wavelength of 555.0000nm, in which the abscissa in the X-axis direction represents the focus offset in mm and the ordinate in the Y-axis direction represents the half image height in mm. T in the astigmatic diagram represents the curvature of the imaging plane IMG in the meridian direction, and S represents the curvature of the imaging plane IMG in the sagittal direction. As can be seen from fig. 2 (b), the astigmatism of the optical system is well compensated.
Fig. 2 (c) also shows a distortion graph of the optical system of the first embodiment at a wavelength of 555.0000 nm. The abscissa along the X-axis direction represents distortion, the ordinate along the Y-axis direction represents half-image height, the unit is mm, and the distortion curve represents distortion magnitude values corresponding to different view angles. As can be seen from fig. 2 (c), the distortion of the optical system is well corrected at a wavelength of 555.0000 nm.
As can be seen from (a), (b) and (c) in fig. 2, the optical system of the present embodiment has smaller aberration, better imaging quality, and good imaging quality.
Second embodiment
Referring to fig. 3 and 4, the structure of the optical system 10 of the present embodiment is the same as that of the first embodiment, and reference is made thereto.
Table 2a shows a characteristic table of the optical system 10 of the present embodiment, and the meaning of each parameter is the same as that of each parameter of the first embodiment, and will not be described here.
TABLE 2a
Table 2b shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in the second embodiment, wherein each of the aspherical surface types can be defined by the formula given in the first embodiment.
TABLE 2b
Fig. 4 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical system of the second embodiment. As can be seen from the aberration diagram in fig. 4, the longitudinal spherical aberration, curvature of field and distortion of the optical system are all well controlled, so that the optical system of this embodiment has good imaging quality.
Third embodiment
Referring to fig. 5 and 6, the optical system 10 of the present embodiment has the same structure as that of the first embodiment, and is referred to.
Table 3a shows a characteristic table of the optical system 10 of the present embodiment, and the meaning of each parameter is the same as that of each parameter of the first embodiment, and will not be described here.
TABLE 3a
Table 3b shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in the third embodiment, wherein each of the aspherical surface types can be defined by the formula given in the first embodiment.
TABLE 3b
Fig. 6 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical system of the third embodiment. In fig. 6 (c), the ordinate along the Y-axis represents the angle of view in deg. As can be seen from the aberration diagram in fig. 6, the longitudinal spherical aberration, curvature of field and distortion of the optical system are all well controlled, so that the optical system of this embodiment has good imaging quality.
Fourth embodiment
Referring to fig. 7 and 8, the optical system 10 of the present embodiment has the same structure as that of the first embodiment, and is referred to.
Table 4a shows a characteristic table of the optical system 10 of the present embodiment, and the meaning of each parameter is the same as that of each parameter of the first embodiment, and will not be described here.
TABLE 4a
Table 4b shows the higher order coefficients that can be used for each aspherical mirror in the fourth embodiment, wherein each aspherical mirror profile can be defined by the formula given in the first embodiment.
TABLE 4b
Fig. 8 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical system of the fourth embodiment. In fig. 8 (c), the ordinate along the Y-axis represents the angle of view in deg. As can be seen from the aberration diagram in fig. 8, the longitudinal spherical aberration, curvature of field and distortion of the optical system are all well controlled, so that the optical system of this embodiment has good imaging quality.
Fifth embodiment
Referring to fig. 9 and 10, the optical system 10 of the present embodiment has the same structure as that of the first embodiment, and is referred to.
Table 5a shows a characteristic table of the optical system 10 of the present embodiment, and the meaning of each parameter is the same as that of each parameter of the first embodiment, and will not be described here.
TABLE 5a
Table 5b shows the higher order coefficients that can be used for each aspherical mirror in the fifth embodiment, wherein each aspherical mirror profile can be defined by the formula given in the first embodiment.
TABLE 5b
Fig. 10 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical system of the fifth embodiment. As can be seen from the aberration diagram in fig. 10, the longitudinal spherical aberration, curvature of field, and distortion of the optical system are all well controlled, so that the optical system of this embodiment has good imaging quality.
Table 6 shows values of each relational expression in the optical system 10 of the first embodiment to the fifth embodiment.
TABLE 6
In some embodiments, the focal lengths of the first lens L1 to the sixth lens L6 satisfy the formula: -1.5< f1/EFL < -1.2, -30< f2/EFL < -9, 1.6< f3/EFL <1.9, -1.1< f4/EFL < -0.9, 0.8< f5/EFL <1, -30< f6/EFL < -7, where f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, f3 is the focal length of the third lens L3, f4 is the focal length of the fourth lens L4, f5 is the focal length of the fifth lens L5, f6 is the focal length of the sixth lens L6, and EFL is the effective focal length of the optical system 10. By satisfying the above formula, the optical power distribution is uniform and reasonable, the aberration is easy to correct, and the image quality is good.
Table 7 shows values of-1.5 < f1/EFL < -1.2, -30< f2/EFL < -9, 1.6< f3/EFL <1.9, -1.1< f4/EFL < -0.9, 0.8< f5/EFL <1, -30< f6/EFL < -7 for the optical systems 10 of the first to fifth embodiments.
TABLE 7
The optical system 10 provided in the above embodiments can satisfy the characteristics of a large angle of view and a large aperture, so that the optical system 10 can have a day-night confocal function, and can perform clear imaging even at night or when the ambient brightness is low.
Referring to fig. 11, the embodiment of the application further provides a lens module 20, where the lens module 20 includes the optical system 10 and the photosensitive chip 201 in any of the foregoing embodiments, and the photosensitive chip 201 is disposed on the image side of the optical system 10, and the two can be fixed by a bracket. The photo-sensing chip 201 may be a CCD sensor (Charge Coupled Device ) or a CMOS sensor (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor). Generally, the imaging plane IMG of the optical system 10 overlaps the photosensitive surface of the photosensitive chip 201 at the time of assembly. By adopting the optical system 10, the lens module 20 can have the characteristics of a large angle of view and a large aperture, so that the lens module 20 can have a day-night confocal function, and can perform clear imaging at night or when the ambient brightness is low.
Referring to fig. 12, an embodiment of the present application also provides an electronic device 30. The electronic device 30 includes a housing 310 and the lens module 20 in the foregoing embodiment, and the lens module 20 is mounted on the housing 310. The electronic device 30 may be, but is not limited to, a vehicle lens, VR (Virtual Reality) glasses, a smart phone, a smart watch, an electronic book reader, a tablet computer, a biometric device (e.g., a fingerprint recognition device or a pupil recognition device, etc.), a PDA (Personal Digital Assistant ), etc. Since the lens module 20 can have the characteristics of large angle of view and large light flux, when the lens module 20 is adopted, the electronic device 30 can have the characteristics of large angle of view and large aperture, so the electronic device 30 can have day-night confocal function, and can perform clear imaging at night or when the ambient brightness is low.
The foregoing disclosure is only illustrative of the preferred embodiments of the present application and is not to be construed as limiting the scope of the application, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced without resorting to the equivalent thereof, which is intended to fall within the scope of the application as defined by the appended claims.
Claims (9)
1. An optical system, characterized in that the number of lenses having refractive power is six, and in order from an object side to an image side, comprising:
the first lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the third lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the fourth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the fifth lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the sixth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the optical system satisfies the relation: 6.8< tan (HFOV)/FNO <8.2;6< H62/SAG62<9.5; wherein FNO is the f-number of the optical system, HFOV is half of the maximum field angle of the optical system, SAG62 is the distance from the intersection point of the image side surface of the sixth lens and the optical axis to the maximum effective caliber of the image side surface of the sixth lens in the direction parallel to the optical axis, and H62 is the vertical distance from the maximum sagittal height of the image side surface of the sixth lens to the optical axis.
2. The optical system of claim 1, wherein the optical system satisfies the relationship:
1<SD1/Imgh<1.25；
SD1 is half of the maximum effective aperture of the object side surface of the first lens, and Imgh is half of the maximum field angle of the optical system corresponding to the image height.
3. The optical system of claim 1, wherein the optical system satisfies the relationship:
0.2<SAG52/CT3<0.43；
wherein SAG52 is the distance between the intersection point of the image side surface of the fifth lens element and the optical axis and the maximum effective aperture of the image side surface of the fifth lens element in the direction parallel to the optical axis, and CT3 is the thickness of the third lens element in the optical axis.
4. The optical system of claim 1, wherein the optical system satisfies the relationship:
-2.3mm -1 ＜R7/（R9×R10）＜-1.2mm -1 ；
wherein R7 is a radius of curvature of the object side surface of the fourth lens element at the optical axis, R9 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, and R10 is a radius of curvature of the image side surface of the fifth lens element at the optical axis.
5. The optical system of claim 1, wherein the optical system satisfies the relationship:
R11/R12 is more than 1.22 and less than 1.72; and/or-1.78 < R1/R3 < -1.6;
wherein R11 is a radius of curvature of the object side surface of the sixth lens element at the optical axis, R12 is a radius of curvature of the image side surface of the sixth lens element at the optical axis, R1 is a radius of curvature of the object side surface of the first lens element at the optical axis, and R3 is a radius of curvature of the object side surface of the second lens element at the optical axis.
6. The optical system of claim 1, wherein the fourth lens and the fifth lens are cemented lenses, and the optical system satisfies the relationship:
0.15＜|(f3×f45)/(f1×f6)|＜0.52
wherein f1 is a focal length of the first lens, f3 is a focal length of the third lens, f45 is a combined focal length of the fourth lens and the fifth lens, and f6 is a focal length of the sixth lens.
7. The optical system of claim 1, wherein the optical system satisfies the relationship:
-2.2mm -1 <R3/（SAG31×CT2）<-1.85mm -1 ；
wherein SAG31 is the distance from the intersection point of the object side surface of the third lens element and the optical axis to the direction parallel to the optical axis, R3 is the radius of curvature of the object side surface of the second lens element at the optical axis, and CT2 is the thickness of the second lens element at the optical axis.
8. A lens module comprising the optical system according to any one of claims 1 to 7 and a photosensitive chip provided on an image side of the optical system.
9. An electronic device comprising a housing and the lens module of claim 8, the lens module disposed within the housing.
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| JP2021107892A (en) * | 2019-12-27 | 2021-07-29 | 久保田 洋治 | Wide-angle lens |
| TW202141101A (en) * | 2020-04-17 | 2021-11-01 | 紘立光電股份有限公司 | Optical imaging lens, imaging device, and electronic device |
| WO2022016316A1 (en) * | 2020-07-20 | 2022-01-27 | 欧菲光集团股份有限公司 | Optical lens, image capturing module, electronic device, and driving device |
| CN114236780A (en) * | 2021-12-23 | 2022-03-25 | 福建福光天瞳光学有限公司 | Wide-angle high-resolution lens |
| CN115951478A (en) * | 2023-03-15 | 2023-04-11 | 江西联益光学有限公司 | Optical lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102526441B1 (en) * | 2020-10-12 | 2023-04-27 | 삼성전기주식회사 | Optical Imaging System |
| CN112748545B (en) * | 2021-02-01 | 2022-05-06 | 浙江舜宇光学有限公司 | Optical imaging lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021107892A (en) * | 2019-12-27 | 2021-07-29 | 久保田 洋治 | Wide-angle lens |
| TW202141101A (en) * | 2020-04-17 | 2021-11-01 | 紘立光電股份有限公司 | Optical imaging lens, imaging device, and electronic device |
| WO2022016316A1 (en) * | 2020-07-20 | 2022-01-27 | 欧菲光集团股份有限公司 | Optical lens, image capturing module, electronic device, and driving device |
| CN114236780A (en) * | 2021-12-23 | 2022-03-25 | 福建福光天瞳光学有限公司 | Wide-angle high-resolution lens |
| CN115951478A (en) * | 2023-03-15 | 2023-04-11 | 江西联益光学有限公司 | Optical lens |
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