CN116736500B - Optical system, lens module and terminal equipment - Google Patents
Optical system, lens module and terminal equipment Download PDFInfo
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Abstract
An optical system, a lens module and a terminal device, wherein the optical system has four lens elements with refractive power, and the object side surface and the image side surface of the third lens element are spherical surfaces; the optical system satisfies the relation: -10.9732 is less than or equal to (f1+f2+f3+f4)/f is less than or equal to-4.1603; wherein f is the focal length of the optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens. The imaging quality of the optical system is higher, and the safety of a driver can be effectively ensured.
Description
Technical Field
The application belongs to the technical field of optical imaging, and particularly relates to an optical system, a lens module and terminal equipment.
Background
With the popularization of automobile intellectualization, the on-board lens module is used as a tool for providing intellectualization assistance for automobiles, and the application of the on-board lens module on automobiles is also becoming wider and wider. The in-vehicle monitoring optical system also should take place at the same time, and the driving state of the driver is related to the safety of the driver and the passengers, so that the in-vehicle monitoring optical system is also receiving more and more attention. Most of the vehicle-mounted monitoring optical systems in the market at present have lower imaging quality and cannot provide guarantee for driving safety of drivers.
Disclosure of Invention
The application aims to provide an optical system, a lens module and terminal equipment, wherein the optical system has higher imaging quality and can effectively ensure the safety of a driver.
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 four lens elements with refractive power, comprising, 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 positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the optical system satisfies the relation: -10.9732 is less than or equal to (f1+f2+f3+f4)/f is less than or equal to-4.1603; wherein f is a focal length of the optical system, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens.
In the optical system provided by the application, the configuration mode of the first lens is beneficial to coupling as much light into the optical system as possible, the object side surface of the first lens is convex at the optical axis, so that the edge light can be increased as much as possible to enter the optical system under the condition of meeting the angle of view, the relative illumination of the edge is improved, the image side surface of the first lens is concave at the optical axis, the light can be smoothly transited to the next lens, and the sensitivity of the optical system is reduced. The configuration mode of the second lens is favorable for 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 is favorable for correcting larger defocus generated by the first lens and the second lens at high and low temperatures, improves the high and low temperature performance of the optical system, has a convex object side surface at the optical axis, is favorable for being matched with the fourth lens to slow down the change of light rays, and reduces the sensitivity of the optical system. The configuration mode of the fourth lens is favorable for slowing down the light entering the imaging surface, so that the sensitivity of the whole optical system and the photosensitive chip is reduced, and the assembly yield of the optical system is increased.
When the relation is satisfied, the effective focal length of each lens is not too strong or too weak relative to the focal length of the system, so that the high-grade spherical aberration of the optical system is corrected, and the imaging quality of the optical system is improved.
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 has higher imaging quality, and the safety of a driver can be effectively ensured.
In a third aspect, the present application further provides a terminal device, where the terminal device includes a fixing member and the lens module of the second aspect, and the lens module is disposed in the fixing member. When the lens module is adopted, the terminal equipment can shoot pictures with higher imaging quality and definition, and the safety of a driver can be effectively ensured.
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 a terminal 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 four lens elements with refractive power, comprising, 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 positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the optical system satisfies the relation: 3.5mm < f/TAN (HFOV) <4.5mm; where f is the focal length 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 coupling as much light into the optical system as possible, the object side surface of the first lens is convex at the optical axis, so that the edge light can be increased as much as possible to enter the optical system under the condition of meeting the angle of view, the relative illumination of the edge is improved, the image side surface of the first lens is concave at the optical axis, the light can be smoothly transited to the next lens, and the sensitivity of the optical system is reduced. The configuration mode of the second lens is favorable for 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 is favorable for correcting larger defocus generated by the first lens and the second lens at high and low temperatures, improves the high and low temperature performance of the optical system, has a convex object side surface at the optical axis, is favorable for being matched with the fourth lens to slow down the change of light rays, and reduces the sensitivity of the optical system. The configuration mode of the fourth lens is favorable for slowing down the light entering the imaging surface, so that the sensitivity of the whole optical system and the photosensitive chip is reduced, and the assembly yield of the optical system is increased.
Alternatively, the value of f/TAN (HFOV) may be 3.5012, 3.7421, 3.9829, 4.0849, 4.2037, 4.2321, 4.2460, 4.2469, 4.3824, 4.4959 in mm. When the relation is satisfied, the focal length and the view angle of the optical system can be reasonably configured, and the depth of field and distortion of the optical system can be balanced on the premise of satisfying the view angle, so that the marginal light entering the optical system can be increased, and the relative illumination of the margin can be improved.
In one embodiment, 1.5 < |R2/R3| < 1.7; wherein R2 is a radius of curvature of the image 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 R2/r3| may be 1.5034, 1.5434, 1.5622, 1.5883, 1.5924, 1.6084, 1.6234, 1.6490, 1.6683, 1.6934.
When the relation is satisfied, the structures of the image side surface of the first lens and the object side surface of the second lens are reasonably configured, so that light rays can smoothly transition from the first lens to the second lens, the intensity of the light rays entering the rear lens is relieved, and the yield of the optical system is improved.
In one embodiment, the optical system satisfies the relationship: 7< TTL/CT1<8, and/or 9< TTL/CT2<14, and/or 6.5< TTL/CT3<9.5, and/or 9< TTL/CT4<13; wherein TTL is the total length of the optical system, that is, the distance between the object side surface of the first lens element and the imaging surface on the optical axis, CT1 is the thickness of the first lens element on the optical axis, CT2 is the thickness of the second lens element on the optical axis, CT3 is the thickness of the third lens element on the optical axis, and CT4 is the thickness of the fourth lens element on the optical axis. Specifically, the TTL/CT1 value may be: 7.1586, 7.1601, 7.1606, 7.1620, 7.5020. The TTL/CT2 value may be: 13.032, 12.360, 12.348, 9.439, 10.190. The TTL/CT3 value may be: 9.453, 8.507, 7.336, 7.582, 6.946. The TTL/CT4 value may be: 9.913, 12.653, 12.853, 11.337, 10.747.
When the relation is satisfied, the center thickness of each lens and the total length of the optical system are configured in a proper range, so that the total length of the optical system can be adjusted through the thickness of the control sheet Zhang Toujing, the distance between the lenses can be adjusted, the distance between the lenses is ensured to be in a proper range, the assembly difficulty can be reduced, the optical refraction effect can be improved, and a clearer image can be obtained.
In one embodiment, the optical system satisfies the relationship: -10.9732 is less than or equal to (f1+f2+f3+f4)/f is less than or equal to-4.1603; wherein f is the focal length of the optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens. Specifically, the value of (f1+f2+f3+f4)/f may be: -10.973, -9.9721, -8.6232, -7.9266, -7.8707, -5.8201, -4.1628, -4.1618.
When the relation is satisfied, the effective focal length of each lens is not too strong or too weak relative to the focal length of the system, so that the high-grade spherical aberration of the optical system is corrected, and the imaging quality of the optical system is improved.
In one embodiment, the optical system satisfies the relationship: f3/f is more than 1.7 and less than 2.0; wherein f is the focal length of the optical system, and f3 is the focal length of the third lens. Specifically, the value of f3/f may be: 1.7012, 1.7512, 1.7541, 1.8112, 1.8311, 1.8679, 1.8910, 1.9289, 1.9582, 1.9913.
When the relation is satisfied, the third lens is made of glass, so that the high temperature resistance and the low temperature resistance of the optical system can be improved, and the temperature application range of the optical system is enlarged.
In one embodiment, the optical system satisfies the relationship: -15 < f2/f < -5; wherein f is the focal length of the optical system, and f2 is the focal length of the second lens. Specifically, the value of f2/f may be: -14.9829, -13.5729, -12.7889, -11.7342, -10.7911, -9.8314, -9.7098, -8.7854, -5.7573, -5.7618.
When the relation is satisfied, the refractive power ratio of the second lens element and the optical system can be reasonably configured, so that the light passing through the second lens element can be reasonably incident into the third lens element by controlling the refractive power of the second lens element; therefore, the aberration generated by the second lens is corrected, and the imaging quality of the optical system is improved; and meanwhile, the device is favorable for reasonable collocation of the photosensitive chip in the later stage.
In one embodiment, the optical system satisfies the relationship: -3< f1/f < -2; wherein f is the focal length of the optical system, and f1 is the focal length of the first lens. Specifically, the value of f1/f may be: -2.9479, -2.8233, -2.7353, -2.6742, -2.5134, -2.4141, -2.3064, -2.2352, -2.1211, -2.0975.
When the relation is satisfied, the refractive power ratio of the first lens and the optical system can be reasonably configured, so that the deflection angle of light rays can be reduced and the imaging quality of the optical system can be improved by controlling the focal length contribution ratio of the refractive power of the first lens to the optical system.
In one embodiment, the optical system satisfies the relationship: 2< f4/f <3; wherein f is the focal length of the optical system, and f4 is the focal length of the fourth lens. Specifically, the value of f4/f may be: 2.0511, 2.1265, 2.2134, 2.3631, 2.4211, 2.5834, 2.6831, 2.7832, 2.8417, 2.9945.
When the relation is satisfied, the reasonable distribution of the refractive power contribution of the fourth lens element is facilitated, the excessive bending of the surface of the fourth lens element caused by the excessively strong refractive power of the fourth lens element is prevented, the reduction of the tolerance sensitivity of the optical system is facilitated, the excessive weak refractive power of the fourth lens element is prevented, the pressure of correcting the aberration of the other lens elements is increased, and the projection imaging quality of the optical system is ensured.
In one embodiment, the optical system satisfies the relationship: 3mm < f3/n3<4mm; wherein f3 is the focal length of the third lens, and n3 is the refractive index of the third lens. Specifically, the value of f3/n3 may be: 3.0121, 3.1593, 3.2534, 3.4590, 3.4541, 3.5691, 3.7022, 3.7479, 3.8093, 3.9271 in mm.
When the above relation is satisfied, the focal length and refractive power of the third lens are reasonably configured, so that the temperature drift of the optical system is corrected by the third lens, and the imaging performance of the optical system is further improved.
In one embodiment, the optical system satisfies the relationship: 3mm -1 ＜R1/(R2×CT1)＜4mm -1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein R1 is a curvature half of the object side surface of the first lens element at the optical axisThe diameter R2 is the radius of curvature of the image side surface of the first lens element at the optical axis, and CT1 is the thickness of the first lens element at the optical axis. Specifically, the value of R1/(r2×ct1) may be: 3.1281, 3.1782, 3.2531, 3.3534, 3.4531, 3.5213, 3.6830, 3.7271, 3.8279, 3.9219 in mm -1 。
When the relation is satisfied, the ratio of the three is in the range, and the thickness of the center of the first lens is more than 2mm, so that the first lens can have higher stability, the object side surface of the first lens can obtain larger light entering brightness and light entering range, and light can be smoothly transited to the next lens, and the optical system is ensured to have smaller optical distortion.
In one embodiment, the optical system satisfies the relationship: -3.5 < R5/R4 < -1.5; wherein R4 is a radius of curvature of the image side surface of the second lens element at the optical axis, and R5 is a radius of curvature of the object side surface of the third lens element at the optical axis. Specifically, the value of R5/R4 may be: -3.4319, -3.2379, -3.0312, -2.7371, -2.5939, -2.5212, -2.1336, -1.9733, -1.6313, -1.5023.
Because the image side surface of the second lens and the object side surface of the third lens are positioned at the position with larger optical change of the optical system, when the relation is satisfied, the curvatures of the second lens and the third lens can be kept in a proper range, so that the effect of light entering the third lens from the second lens is improved through the adaptation of the curvatures of the second lens and the third lens, and the sensitivity of the optical system is further reduced; and the surface shapes of the second lens and the third lens are reasonably configured, and the assembly yield of the optical system can be improved.
In one embodiment, the optical system satisfies the relationship: R1/TTL is more than 1.5 and less than 1.8; wherein, R1 is a radius of curvature of the object side surface of the first lens at the optical axis, and TTL is an overall length of the optical system. Specifically, the value of R1/TTL may be: 1.5032, 1.5321, 1.5494, 1.6091, 1.6371, 1.6678, 1.7012, 1.7334, 1.7518, 1.7933.
When the relation is satisfied, the ghost image of the optical system can be effectively reduced and the performance of the optical system can be ensured under the condition of ensuring the total length of the optical system.
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 to eliminate aberration more effectively 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 has higher imaging quality, and the safety of a driver can be effectively ensured.
In a third aspect, the present application further provides a terminal device, where the terminal device includes a fixing member and the lens module of the second aspect, and the lens module is disposed in the fixing member. When the lens module is adopted, the terminal equipment can shoot pictures with higher imaging quality and definition, and the safety of a driver can be effectively ensured.
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 positive refractive power has a concave object-side surface S7 and a convex image-side surface S8 at a paraxial region.
Wherein, the third lens L3 is made of glass, and the rest lenses are made of plastic.
Further, the optical system 10 includes a stop STO, a cover glass CG, a filter IR, and an imaging plane IMG. A stop STO is provided between the second lens L2 and the third lens L3 for controlling the amount of light entering. The cover glass CG includes an object side surface S11 and an image side surface S12.
The filter IR includes an object side surface S9 and an image side surface S10. The filter IR is an infrared pass filter for filtering visible light, and is used for infrared imaging or the like by allowing only infrared light to pass through. The effective pixel area of the photosensitive chip is positioned on the imaging surface IMG.
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, f is a 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 total length of the optical system 10, that is, a distance from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical system 10 on the optical axis 101.
In this embodiment, the third lenses L3 are spherical lenses; the first lens L1, the second lens L2, and the fourth lens L4 are all aspherical lenses. Aspherical surface typexThe following aspherical formula may be used but is not limited to:
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 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 960.0000nm, 940.0000nm, 920.0000nm, in which 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 deviation 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 940.0000nm, 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 940.0000 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 940.0000 nm.
As can be seen from fig. 2 (a), fig. 2 (b) and fig. 2 (c), the optical system of the present embodiment has small aberration, good 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. 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. 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
The optical system 10 provided in the above embodiments has high imaging quality, and can effectively ensure the safety of the driver.
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 has higher imaging quality, and the safety of a driver can be effectively ensured.
Referring to fig. 12, the embodiment of the present application further provides a terminal device 30. The terminal device 30 includes a fixing member 310 and the lens module 20 in the foregoing embodiment, and the lens module 20 is mounted on the fixing member 310. The terminal device 30 may be, but is not limited to, a vehicle, 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. Because the lens module 20 can have the characteristic of large light flux, when the lens module 20 is adopted, the terminal device 30 can shoot pictures with higher imaging quality and definition, and the safety of a driver can be effectively ensured.
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 (10)
1. An optical system characterized in that the number of lenses having refractive power is four, comprising, 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 positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the optical system satisfies the relation: -10.9732 is less than or equal to (f1+f2+f3+f4)/f is less than or equal to-4.1603; wherein f is a focal length of the optical system, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens.
2. The optical system of claim 1, wherein the optical system satisfies the relationship:
1.5 < |R2/R3| < 1.7, and/or-3.5 < R5/R4 < -1.5;
wherein R2 is a radius of curvature of the image side surface of the first lens element at the optical axis, R3 is a radius of curvature of the object side surface of the second lens element at the optical axis, R4 is a radius of curvature of the image side surface of the second lens element at the optical axis, and R5 is a radius of curvature of the object side surface of the third lens element at the optical axis.
3. The optical system of claim 1, wherein the optical system satisfies the relationship:
7< TTL/CT1<8, and/or 9< TTL/CT2<14, and/or 6.5< TTL/CT3<9.5, and/or 9< TTL/CT4<13;
wherein TTL is the total length of the optical system, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, and CT4 is the thickness of the fourth lens on the optical axis.
4. The optical system of claim 1, wherein the optical system satisfies the relationship:
3.5mm<f/TAN(HFOV)<4.5mm；
wherein the HFOV is one half of the maximum field angle of the optical system.
5. The optical system of claim 1, wherein the optical system satisfies the relationship:
1.7 < f3/f < 2.0, and/or-15 < f2/f < -5.
6. The optical system of claim 1, wherein the optical system satisfies the relationship:
3mm<f3/n3<4mm；
wherein n3 is the refractive index of the third lens.
7. The optical system of claim 1, wherein the optical system satisfies the relationship:
3mm -1 ＜R1/(R2×CT1)＜4mm -1 ；
wherein R1 is a radius of curvature of the object side surface of the first lens element at the optical axis, R2 is a radius of curvature of the image side surface of the first lens element at the optical axis, and CT1 is a thickness of the first lens element at the optical axis.
8. The optical system of claim 1, wherein the optical system satisfies the relationship:
1.5＜R1/TTL＜1.8；
wherein R1 is a radius of curvature of the object side surface of the first lens at the optical axis, and TTL is a total length of the optical system.
9. A lens module comprising the optical system according to any one of claims 1 to 8 and a photosensitive chip provided on an image side of the optical system.
10. A terminal device, characterized in that the terminal device comprises a fixing member and the lens module according to claim 9, the lens module being arranged at the fixing member.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109814237A (en) * | 2019-03-18 | 2019-05-28 | 北京经纬恒润科技有限公司 | A kind of DMS wide-angle camera and camera system |
| CN210626765U (en) * | 2019-09-23 | 2020-05-26 | 欧菲晶创光电(天津)有限公司 | Optical imaging system, image capturing device and electronic device |
| JP2022131903A (en) * | 2021-02-26 | 2022-09-07 | 株式会社タムロン | Optical system and image capturing device |
| CN115616732A (en) * | 2021-07-12 | 2023-01-17 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN115857148A (en) * | 2022-12-20 | 2023-03-28 | 江西联创电子有限公司 | Optical lens |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109814237A (en) * | 2019-03-18 | 2019-05-28 | 北京经纬恒润科技有限公司 | A kind of DMS wide-angle camera and camera system |
| CN210626765U (en) * | 2019-09-23 | 2020-05-26 | 欧菲晶创光电(天津)有限公司 | Optical imaging system, image capturing device and electronic device |
| JP2022131903A (en) * | 2021-02-26 | 2022-09-07 | 株式会社タムロン | Optical system and image capturing device |
| CN115616732A (en) * | 2021-07-12 | 2023-01-17 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN115857148A (en) * | 2022-12-20 | 2023-03-28 | 江西联创电子有限公司 | Optical lens |
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