WO2021184214A1 - 广角镜头、成像模组、电子装置及驾驶装置 - Google Patents

广角镜头、成像模组、电子装置及驾驶装置 Download PDF

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Publication number
WO2021184214A1
WO2021184214A1 PCT/CN2020/079774 CN2020079774W WO2021184214A1 WO 2021184214 A1 WO2021184214 A1 WO 2021184214A1 CN 2020079774 W CN2020079774 W CN 2020079774W WO 2021184214 A1 WO2021184214 A1 WO 2021184214A1
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Prior art keywords
lens
wide
angle lens
angle
object side
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PCT/CN2020/079774
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English (en)
French (fr)
Inventor
蔡雄宇
兰宾利
赵迪
周芮
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天津欧菲光电有限公司
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Priority to PCT/CN2020/079774 priority Critical patent/WO2021184214A1/zh
Publication of WO2021184214A1 publication Critical patent/WO2021184214A1/zh

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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
    • 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

Definitions

  • This application relates to the field of optical imaging technology, in particular to a wide-angle lens, imaging module, electronic device and driving device.
  • the front-view camera device can be used as the camera system in the advanced driver assistance system to analyze the video content, realize lane departure warning (LDW), automatic lane keeping assist (LKA), high beam/low beam control and traffic sign recognition ( TSR).
  • LDW lane departure warning
  • LKA automatic lane keeping assist
  • TSR traffic sign recognition
  • the front-view camera device when parking, the front-view camera device is automatically turned on, and the driver can intuitively see the obstacles in front of the car, thereby facilitating the parking operation; and when the car passes through special places (such as roadblocks, parking lots, etc.), the front-view camera device It can also be automatically turned on to obtain information about the environment around the vehicle and feed it back to the central system of the car to make correct instructions to avoid driving accidents.
  • special places such as roadblocks, parking lots, etc.
  • Traditional vehicle-mounted lenses usually use more than six lenses to obtain higher resolution capabilities. However, increasing the number of lenses will affect the miniaturization of the lens, is not conducive to the installation and use of the lens, and will also increase the cost of the lens.
  • the traditional front-view wide-angle lens captures images with low resolution and small depth of field. It is unable to display long-distance details while achieving wide-angle shooting, so that the driving assistance system cannot accurately perform real-time and accurate information about the environment around the vehicle. Judging and then making timely warning or avoidance, there is a certain driving risk.
  • a wide-angle lens is provided.
  • a wide-angle lens which includes in order from the object side to the image side along the optical axis:
  • a first lens with negative refractive power wherein the object side of the first lens is a convex surface near the optical axis, and the image side of the first lens is a concave surface near the optical axis;
  • a second lens with negative refractive power, the object side of the second lens is concave;
  • the third lens with positive refractive power
  • a fourth lens with negative refractive power the image side surface of the fourth lens is concave;
  • a fifth lens with positive refractive power, the object side of the fifth lens is convex
  • the sixth lens with positive refractive power
  • a diaphragm the diaphragm being arranged on the object side of the wide-angle lens or between the first lens and the sixth lens;
  • the wide-angle lens satisfies the following relationship:
  • dn5/dt5 represents the relative refractive index temperature coefficient of the fifth lens in the range of 20-40°C.
  • An imaging module includes the wide-angle lens described in the above embodiment; and a photosensitive element, the photosensitive element being arranged on the image side of the wide-angle lens.
  • An electronic device includes a housing and the imaging module described in the above embodiments, and the imaging module is installed on the housing.
  • a driving device includes a vehicle body and the imaging module described in the above embodiments, and the imaging module is provided on the vehicle body to obtain environmental information around the vehicle body.
  • FIG. 1 shows a schematic structural diagram of a wide-angle lens of Embodiment 1 of the present application
  • FIG. 3 shows a schematic structural diagram of a wide-angle lens according to Embodiment 2 of the present application
  • FIG. 5 shows a schematic structural diagram of a wide-angle lens according to Embodiment 3 of the present application.
  • FIG. 6 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens of Embodiment 3 respectively;
  • FIG. 7 shows a schematic structural diagram of a wide-angle lens according to Embodiment 4 of the present application.
  • FIG. 8 shows the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the wide-angle lens of Embodiment 4 respectively;
  • FIG. 9 shows a schematic structural diagram of a wide-angle lens according to Embodiment 5 of the present application.
  • FIG. 10 respectively shows a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the wide-angle lens of Embodiment 5;
  • FIG. 11 shows a schematic structural diagram of a wide-angle lens according to Embodiment 6 of the present application.
  • Fig. 12 respectively shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the wide-angle lens of Embodiment 6;
  • FIG. 13 shows a schematic structural diagram of a wide-angle lens according to Embodiment 7 of the present application.
  • FIG. 14 respectively shows a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the wide-angle lens of Embodiment 7;
  • FIG. 15 shows a schematic diagram of an imaging module according to an embodiment of the present application.
  • FIG. 16 shows a schematic diagram of a driving device using an imaging module according to an embodiment of the present application
  • FIG. 17 shows a schematic diagram of an electronic device using an imaging module according to an embodiment of the present application.
  • first lens discussed below may also be referred to as a second lens or a third lens.
  • shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspheric surface is not limited to the shape of the spherical surface or the aspheric surface shown in the drawings.
  • the drawings are only examples and are not drawn strictly to scale.
  • the space on the side of the object relative to the optical element is called the object side of the optical element.
  • the space on the side of the object relative to the optical element is called the image of the optical element. side.
  • the surface of each lens closest to the object is called the object side, and the surface of each lens closest to the imaging surface is called the image side.
  • the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least near the optical axis; if the lens surface is concave and the position of the concave surface is not defined, it means The lens surface is concave at least near the optical axis.
  • the near optical axis here refers to the area near the optical axis.
  • the high-pixel wide-angle lens can clearly present the captured scene information on the photosensitive surface of the photosensitive element and transmit it to the corresponding system for identification processing. It plays a very important role in the reversing system, the automatic driving system and the monitoring system. However, it is difficult for the traditional vehicle-mounted lens to be designed with both miniaturization and high resolution capability, which makes the lens preparation cost high and difficult to mass-produce.
  • the wide-angle lens includes six lenses with refractive power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.
  • the six lenses are arranged in order from the object side to the image side along the optical axis, and the imaging surface of the wide-angle lens is located on the image side of the sixth lens.
  • the first lens has a negative refractive power. Its object side is convex near the optical axis, and the image side is concave near the optical axis, which is conducive to making large-angle light incident into the optical system and refracted by other lenses in the optical system. So that the light is converged to the imaging surface of the system, and the imaging quality is improved.
  • the second lens has negative refractive power, and its object side is concave. Adjusting the radius of curvature of the object side and the image side of the second lens is beneficial to correct the edge aberrations generated by some of the first lenses and optimize the wide-angle imaging quality of the lens; at the same time, it is also beneficial to suppress astigmatism and further improve the imaging quality.
  • the third lens has a positive refractive power, which can converge the light diverged due to the strong negative refractive power of the first lens and the second lens, so that the distance between the third lens and the diaphragm is reduced, thereby making the lens structure more compact. It is easy to realize the miniaturization of the lens system.
  • the fourth lens has a negative refractive power
  • the fifth lens has a positive refractive power
  • the fifth lens can cooperate with the fourth lens to correct the chromatic aberration of the lens, and further correct the aberration, and improve the imaging resolution ability of the lens.
  • the image side surface of the fourth lens is concave
  • the object side surface of the fifth lens is convex.
  • the image side surface of the fourth lens and the object side surface of the fifth lens can be cemented together, so that the overall structure of the wide-angle lens can be more compact.
  • Conducive to correcting aberrations achieving a balance between reducing the size of the lens and improving the resolution of the lens, and at the same time can reduce the tolerance sensitivity problems such as tilt or eccentricity of the lens during the assembly process, and improve the assembly yield of the lens.
  • the discrete lenses at the turning points of light are easily sensitive due to processing errors and/or assembly errors, and the use of cemented lenses can effectively reduce the sensitivity of the lens.
  • the cemented lens used in this application can not only effectively reduce the sensitivity of the lens and shorten the overall length of the lens, but also can share the overall chromatic aberration and aberration correction of the lens, and improve the resolution capability of the wide-angle lens.
  • the cemented lens may include a lens with negative refractive power and a lens with positive refractive power.
  • the fourth lens has negative refractive power and the fifth lens has positive refractive power.
  • the sixth lens has a positive refractive power, which is beneficial to reduce the chief ray exit angle, reduce the angle of the light entering the chip, and improve the photosensitive performance of the photosensitive element; at the same time, it is also beneficial to ensure the miniaturization of the lens.
  • the wide-angle lens is also provided with an aperture, which is arranged on the object side of the wide-angle lens or between the first lens and the sixth lens to better control the size of the incident light beam and improve the imaging quality of the wide-angle lens.
  • the diaphragm is arranged between the third lens and the fourth lens. Specifically, the diaphragm includes an aperture diaphragm and a field diaphragm. Preferably, the diaphragm is an aperture diaphragm.
  • the aperture stop can be located on the surface of the lens (for example, the object side and the image side) and form an functional relationship with the lens, for example, by coating a light-blocking coating on the surface of the lens to form an aperture stop on the surface; or by clamping
  • the holder fixedly clamps the surface of the lens, and the holder structure on the surface can limit the width of the imaging beam of the object point on the axis, thereby forming an aperture stop on the surface.
  • the wide-angle lens satisfies the following relationship: -2 ⁇ 10 -6 /k ⁇ dn5/dt5 ⁇ 4.5 ⁇ 10 -6 /k; where dn5/dt5 represents the relative refractive index of the fifth lens in the range of 20-40°C Temperature Coefficient.
  • dn5 / dt5 may be -1.5 ⁇ 10 -6 / k, -1 ⁇ 10 -6 /k,0.5 ⁇ 10 -6 / k, 2 ⁇ 10 -6 / k, 3 ⁇ 10 -6 / k, 4 ⁇ 10 -6 /k,4.2 ⁇ 10 -6 / k or 4.3 ⁇ 10 -6 / k.
  • the effective focal length of the fifth lens can meet the characteristics of high temperature elongation and low temperature shortening, which is beneficial to compensate for the refractive index changes of other lenses and reduce the impact of temperature changes on the resolution of the lens. Ensure the consistency of the imaging performance of the wide-angle lens at different temperatures.
  • dn5/dt5 is lower than the lower limit or higher than the upper limit, the refractive index of the fifth lens is greatly affected by the temperature change, so that the resolution ability of the lens is greatly affected by the temperature, and the image quality is easily reduced.
  • the light emitted or reflected by the subject enters the wide-angle lens from the object side and passes through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens in sequence , And finally converge on the imaging surface.
  • the above-mentioned wide-angle lens can enhance the imaging resolution capability of the wide-angle lens and effectively correct aberrations by selecting an appropriate number of lenses and reasonably distributing the refractive power, surface shape and effective focal length of each lens, so that it can capture the details of the scene more accurately;
  • the temperature coefficient of the relative refractive index of the fifth lens is used to compensate the effect of temperature changes on the resolution of the lens, ensuring the consistency of the imaging performance of the wide-angle lens at different temperatures.
  • the object side surface and/or the image side surface of at least one lens are aspherical.
  • the fourth lens and the fifth lens are cemented, and the wide-angle lens satisfies the following relationship: R45>0; where R45 represents the radius of curvature of the cemented surface of the fourth lens and the fifth lens at the optical axis.
  • R45 can be 2.3mm, 2.4mm, 2.45mm, 2.5mm, 2.55mm, 2.6mm, 2.65mm or 2.7mm. Cementing the fourth lens and the fifth lens can make the overall structure of the wide-angle lens more compact, reduce the tolerance sensitivity problems such as tilt or decentering during the assembly process of the lens, and improve the assembly yield of the lens; it is also conducive to correction Chromatic aberration further enhances the image quality.
  • the wide-angle lens satisfies the following relationship: -4 ⁇ f1/f ⁇ 0; where f1 represents the effective focal length of the first lens, and f represents the effective focal length of the wide-angle lens.
  • f1/f can be -3, -2.9, -2.8, -2.7, -2.6, -2.5, -2.4, -2, -1.5, -1.3, or -1.
  • the lens can be provided with negative refractive power, and by satisfying the upper limit of the conditional expression, the negative refractive power of the first lens will not become too strong, which is beneficial to suppress the damage caused by the peripheral part of the imaging area.
  • the wide-angle lens satisfies the following relationship: 0 ⁇ f123/f ⁇ 4; where f123 represents the combined focal length of the first lens, the second lens, and the third lens, and f represents the effective focal length of the wide-angle lens.
  • f123/f can be 0.5, 1, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.5, 3, or 3.5.
  • the wide-angle lens satisfies the following relationship: 0 ⁇ (RS2-RS1)/f1 ⁇ 1; where RS1 represents the radius of curvature of the object side surface of the first lens at the optical axis, and RS2 represents the image side surface of the first lens at the The radius of curvature at the optical axis, f1 represents the effective focal length of the first lens.
  • (RS2-RS1)/f1 can be 0.2, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.4, 0.6 or 0.8.
  • the radius of curvature of the object side surface and the image side surface of the first lens can be reasonably set, thereby reducing the processing difficulty of the lens and reducing the risk of eccentricity during processing.
  • (RS2-RS1)/f1 is less than or equal to 0, the curvature radius of the image side surface of the first lens is too large, which is not conducive to light collection and aberration correction; and when (RS2-RS1)/f1 is greater than or equal to 1, the first lens
  • the difference in the degree of curvature between the object side and the image side of the lens increases, which increases the processing difficulty and easily increases the risk of eccentricity during processing.
  • the wide-angle lens satisfies the following relationship:
  • RS3+RS4)/(RS3-RS4) can be -5.5, -5.4, -5.3, -5.2, -5.1, -5, -3, -1, 1, 1.3, or 1.5.
  • the wide-angle lens satisfies the following relationship: 5 ⁇
  • can be 5.2, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, or 10.5.
  • the radius of curvature of the object side and the image side of the third lens can be set reasonably, which is beneficial to control the curvature of the lens, reduce the processing difficulty of the lens, and reduce the risk of eccentricity during the processing.
  • the wide-angle lens satisfies the following relationship: 4 ⁇ TTL/ ⁇ D ⁇ 5; where TTL represents the distance from the object side of the first lens to the imaging surface of the wide-angle lens on the optical axis, and ⁇ D represents the first lens The sum of the distances on the optical axis from the image side surface of the previous lens to the object side surface of the next lens among adjacent lenses of the sixth lens.
  • TTL/ ⁇ D can be 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8 or 4.9.
  • the air space between adjacent lenses can be reasonably configured, so that the lens structure is more compact, and the miniaturization of the lens is realized; at the same time, the above setting is also beneficial to increase the thermal stability of the lens.
  • TTL/ ⁇ D is less than or equal to 4
  • the distance between adjacent lenses is large, which is not conducive to lens assembly, and it is also not conducive to reducing ghost images;
  • TTL/ ⁇ D is greater than or equal to 5
  • the total lens length is larger , Is not conducive to miniaturization.
  • the wide-angle lens satisfies the following relationship: 1 ⁇ f456/f ⁇ 5; where f456 represents the combined focal length of the fourth lens, the fifth lens, and the sixth lens, and f represents the effective focal length of the wide-angle lens.
  • f456/f can be 1.4, 1.8, 1.9, 2.0, 2.1, 2.2, 2.5, 3, 3.5, 4, 4.5, or 4.8.
  • the fourth lens, the fifth lens and the sixth lens can provide positive refractive power for the lens as a whole, and the refractive power of each lens can be reasonably configured according to the above relationship, which is beneficial to reduce the system sensitivity and improve the production yield.
  • the wide-angle lens satisfies the following relational expressions: Vd3>40, Vd5>40; where Vd3 represents the d-light Abbe number of the third lens, and Vd5 represents the d-light Abbe number of the fifth lens.
  • d light refers to light with a wavelength of 587.56 nm.
  • Vd3 can be 42, 44, 46, 48, 50, or 52, and Vd5 can be 42, 44, 46, 48, 50, 51, 52, 54 or 55.
  • the wide-angle lens satisfies the following relationship: -2 ⁇ 10 -6 /k ⁇ dn5/dt5 ⁇ -0.1 ⁇ 10 -6 /k.
  • the wide-angle lens satisfies the following relationship: 0 ⁇
  • can be 1, 2, 3, 3.1, 3.15, 3.2, 3.25, 3.3, 3.35, 3.4, 3.6, or 3.8.
  • the wide-angle lens satisfies the following relationship:
  • TTL represents the distance from the object side of the first lens to the imaging surface of the wide-angle lens on the optical axis
  • FOV represents the diagonal field angle of the wide-angle lens.
  • TTL/tan (1/2FOV) can be 12.1mm, 12.2mm, 12.3mm, 12.4mm, 12.5mm, 12.6mm, 12.7mm, 15mm, 18mm, 20mm or 20.5mm. Under the condition that the above relationship is satisfied, the lens can be better balanced with wide-angle and miniaturization.
  • the wide-angle lens satisfies the following relationship: 0 ⁇ ImgH/f ⁇ 3; where ImgH represents the diagonal length of the effective pixel area on the imaging surface of the wide-angle lens, and f represents the effective focal length of the wide-angle lens.
  • ImgH/f can be 1, 1.1, 1.2, 1.25, 1.3, 1.4, 1.5, 2, or 2.5.
  • the material of each lens in the wide-angle lens may be glass or plastic.
  • the plastic lens can reduce the weight and production cost of the wide-angle lens, while the glass lens can make the wide-angle lens have better temperature resistance. Acceptable characteristics and excellent optical performance.
  • the material of each lens is preferably glass. It should be noted that the material of each lens in the wide-angle lens can also be any combination of glass and plastic, and not necessarily all glass or plastic.
  • the wide-angle lens further includes an infrared filter.
  • the infrared filter is set on the image side of the sixth lens, used to filter incident light, specifically to isolate infrared light, prevent infrared light from being absorbed by the photosensitive element, so as to prevent infrared light from affecting the color and clarity of normal images, and improve The imaging quality of a wide-angle lens.
  • the wide-angle lens further includes a protective glass.
  • the protective glass is arranged on the image side of the infrared filter, so that it can be close to the photosensitive element when subsequently assembled into a module, and play a role in protecting the photosensitive element.
  • the photosensitive element is located on the imaging surface of the wide-angle lens. Further, the imaging surface may be the photosensitive surface of the photosensitive element.
  • the wide-angle lens of the above-mentioned embodiment of the present application may use multiple lenses, for example, the above-mentioned six lenses.
  • FNO large aperture
  • the number of lenses constituting the wide-angle lens can be changed to obtain the various results and advantages described in this specification.
  • FIG. 1 shows a schematic diagram of the structure of the wide-angle lens 100 of Embodiment 1.
  • the wide-angle lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 in order from the object side to the image side along the optical axis. And imaging surface S17.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 and the image side surface S2 are both aspherical, wherein the object side surface S1 is a convex surface near the optical axis, and the image side surface S2 is a concave surface near the optical axis.
  • the second lens L2 has a negative refractive power, and the object side surface S3 and the image side surface S4 are both spherical surfaces, wherein the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface.
  • the third lens L3 has a positive refractive power, and the object side surface S5 and the image side surface S6 are both spherical surfaces, wherein the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface.
  • the fourth lens L4 has a negative refractive power
  • the object side surface S7 is a flat surface
  • the image side surface S8 is a spherical surface
  • the image side surface S8 is a concave surface.
  • the fifth lens L5 has a positive refractive power, and the object side surface S9 and the image side surface S10 are both spherical surfaces, wherein the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface.
  • the sixth lens L6 has a positive refractive power, and the object side surface S11 and the image side surface S12 are both aspherical, wherein the object side surface S11 is a concave surface near the optical axis, and the image side surface S12 is a convex surface near the optical axis.
  • the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 are cemented to form a cemented lens, thereby making the overall structure of the wide-angle lens 100 more compact, and reducing the sensitivity to tolerances such as tilt or eccentricity of the lens during assembly. Degree issues, improve the assembly yield of the lens.
  • the materials of the first lens L1 to the sixth lens L6 are all glass, and the use of a glass lens can enable the wide-angle lens 100 to have better temperature tolerance characteristics and excellent optical performance.
  • a stop STO is also provided between the third lens L3 and the fourth lens L4 to limit the size of the incident light beam and further improve the imaging quality of the wide-angle lens 100.
  • the wide-angle lens 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and having an object side surface S13 and an image side surface S14, and a protective glass 120 disposed on the image side of the filter 110 and having an object side surface S15 and an image side surface S16.
  • the light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • the filter 110 is an infrared filter, which is used to filter the infrared light from the external light incident on the wide-angle lens 100 to avoid imaging distortion.
  • the material of the filter 110 is glass.
  • the filter 110 and the protective glass 120 may be part of the wide-angle lens 100 and be assembled with each lens, or they may be installed together when the wide-angle lens 100 is assembled with the photosensitive element.
  • Table 1 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e. dispersion coefficient) and effective focal length of the lens of the wide-angle lens 100 of Example 1.
  • the radius of curvature, thickness, lens The units of the effective focal length are all millimeters (mm).
  • the surface of the lens closest to the object is called the object side, and the surface of the lens closest to the imaging surface is called the image side.
  • the first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens on the optical axis
  • the second value is the direction from the image side to the image side of the lens.
  • the value of the stop ST0 in the "thickness" parameter column is from the stop ST0 to the apex of the object side of the latter lens (the apex refers to the intersection of the lens and the optical axis) in the light
  • the distance on the axis we default that the direction from the object side of the first lens L1 to the image side of the last lens is the positive direction of the optical axis.
  • the value is negative, it means that the stop ST0 is set on the object side of the lens in Figure 1 On the right side of the vertex, if the thickness of the diaphragm STO is positive, the diaphragm is on the left side of the vertex on the object side of the lens.
  • the aspheric surface type in the lens is defined by the following formula:
  • x is the distance vector height of the aspheric surface from the apex of the aspheric surface when the height is h along the optical axis direction;
  • k is the conic coefficient;
  • Ai is the i-th order coefficient of the aspheric surface.
  • Table 2 below shows the higher order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the lens aspheric surfaces S1-S2 and S11-S12 in Example 1.
  • dn5/dt5 -1.2 ⁇ 10 -6 /k, where dn5/dt5 represents the relative refractive index temperature coefficient of the fifth lens L5 in the range of 20-40°C;
  • R45 2.631mm, where R45 represents the radius of curvature of the cemented surface of the fourth lens L4 and the fifth lens L5 at the optical axis;
  • f1/f -1.374, where f1 represents the effective focal length of the first lens L1, and f represents the effective focal length of the wide-angle lens 100;
  • f123/f 0.986, where f123 represents the combined focal length of the first lens L1, the second lens L2, and the third lens L3, and f represents the effective focal length of the wide-angle lens 100;
  • RS3+RS4)/(RS3-RS4) 1.399, where RS3 represents the curvature radius of the second lens L2 object side surface S3 at the optical axis, and RS4 represents the curvature radius of the second lens L2 image side surface S4 at the optical axis;
  • TTL/ ⁇ D 4.852, where TTL represents the distance from the object side S1 of the first lens L1 to the imaging surface S17 of the wide-angle lens 100 on the optical axis, and ⁇ D represents the adjacent lenses of the first lens L1 to the sixth lens L6 The sum of the distances from the image side of the front lens to the object side of the rear lens on the optical axis;
  • f456/f 4.702, where f456 represents the combined focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6, and f represents the effective focal length of the wide-angle lens 100;
  • Vd3 51.1
  • Vd5 51.1
  • Vd3 represents the d-light Abbe number of the third lens L3
  • Vd5 represents the d-light Abbe number of the fifth lens L5;
  • TTL/tan(1/2FOV) 20.134mm, where TTL represents the distance from the object side S1 of the first lens L1 to the imaging surface S17 of the wide-angle lens 100 on the optical axis.
  • TTL is 24mm, and FOV represents the wide-angle lens 100 Angle of view in the diagonal direction;
  • ImgH/f 1.106, where ImgH represents the diagonal length of the effective pixel area on the imaging surface S17 of the wide-angle lens 100. In the embodiment, ImgH is 5.762 mm, and f represents the effective focal length of the wide-angle lens 100.
  • the longitudinal spherical aberration graph shows the deviation of the focal point of light with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm and 656.27nm after passing through the wide-angle lens 100;
  • the astigmatism graph shows that the light with a wavelength of 546.07nm passes through the wide-angle lens Meridional field curvature and sagittal field curvature after 100;
  • the distortion curve diagram shows the distortion of light with a wavelength of 546.07nm after passing through the wide-angle lens 100 at different angles of view.
  • FIG. 2 it can be seen that the wide-angle lens 100 provided in Embodiment 1 can achieve good imaging quality.
  • FIG. 3 shows a schematic structural diagram of a wide-angle lens 100 according to Embodiment 2 of the present application.
  • the wide-angle lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 in order from the object side to the image side along the optical axis. And imaging surface S17.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 and the image side surface S2 are both aspherical, wherein the object side surface S1 is a convex surface near the optical axis, and the image side surface S2 is a concave surface near the optical axis.
  • the second lens L2 has a negative refractive power, and the object side surface S3 and the image side surface S4 are both spherical surfaces, wherein the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface.
  • the third lens L3 has a positive refractive power, and the object side surface S5 and the image side surface S6 are both spherical surfaces, wherein the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens L4 has a negative refractive power, and the object side surface S7 and the image side surface S8 are both spherical surfaces, wherein the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens L5 has a positive refractive power, and the object side surface S9 and the image side surface S10 are both spherical surfaces, wherein the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface.
  • the sixth lens L6 has a positive refractive power, and the object side surface S11 and the image side surface S12 are both aspherical, wherein the object side surface S11 is a concave surface near the optical axis, and the image side surface S12 is a convex surface near the optical axis.
  • the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 are cemented to form a cemented lens, thereby making the overall structure of the wide-angle lens 100 more compact, and reducing the sensitivity to tolerances such as tilt or eccentricity of the lens during assembly. Degree issues, improve the assembly yield of the lens.
  • the object and image sides of the first lens L1 and the sixth lens L6 are set to be aspherical surfaces, the materials of the first lens L1 to the sixth lens L6 are all glass, and there is also set between the third lens L3 and the fourth lens L4 Aperture STO.
  • the wide-angle lens 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and having an object side surface S13 and an image side surface S14, and a protective glass 120 disposed on the image side of the filter 110 and having an object side surface S15 and an image side surface S16.
  • the light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • the filter 110 is an infrared filter, which is used to filter the infrared light from the external light incident on the wide-angle lens 100 to avoid imaging distortion.
  • Table 3 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (ie dispersion coefficient) and effective focal length of each lens of the wide-angle lens 100 of Example 2, where the radius of curvature, thickness, The unit of the effective focal length of each lens is millimeter (mm).
  • Table 4 shows the coefficients of higher order terms that can be used for the aspheric surfaces S1-S2 and S11-S12 of the lens in Example 2, where the aspheric surface type can be defined by the formula (1) given in Example 1;
  • Table 5 shows The relevant parameter values of the wide-angle lens 100 given in Embodiment 2 are shown.
  • the longitudinal spherical aberration graph shows the deviation of the focal point of light with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm and 656.27nm after passing through the wide-angle lens 100;
  • the astigmatism graph shows that the light with a wavelength of 546.07nm passes through the wide-angle lens Meridional field curvature and sagittal field curvature after 100;
  • the distortion curve diagram shows the distortion of light with a wavelength of 546.07nm after passing through the wide-angle lens 100 at different angles of view. It can be seen from FIG. 4 that the wide-angle lens 100 provided in Embodiment 2 can achieve good imaging quality.
  • FIG. 5 shows a schematic structural diagram of a wide-angle lens 100 according to Embodiment 3 of the present application.
  • the wide-angle lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 in order from the object side to the image side along the optical axis. And imaging surface S17.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 and the image side surface S2 are both aspherical, wherein the object side surface S1 is a convex surface near the optical axis, and the image side surface S2 is a concave surface near the optical axis.
  • the second lens L2 has a negative refractive power, and the object side surface S3 and the image side surface S4 are both spherical surfaces, wherein the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface.
  • the third lens L3 has a positive refractive power, and the object side surface S5 and the image side surface S6 are both spherical surfaces, wherein the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens L4 has a negative refractive power, and the object side surface S7 and the image side surface S8 are both spherical surfaces, wherein the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens L5 has a positive refractive power, and the object side surface S9 and the image side surface S10 are both spherical surfaces, wherein the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface.
  • the sixth lens L6 has a positive refractive power, and the object side surface S11 and the image side surface S12 are both aspherical, wherein the object side surface S11 is a concave surface near the optical axis, and the image side surface S12 is a convex surface near the optical axis.
  • the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 are cemented to form a cemented lens, thereby making the overall structure of the wide-angle lens 100 more compact, and reducing the sensitivity to tolerances such as tilt or eccentricity of the lens during assembly. Degree issues, improve the assembly yield of the lens.
  • the object and image sides of the first lens L1 and the sixth lens L6 are set to be aspherical surfaces, the materials of the first lens L1 to the sixth lens L6 are all glass, and there is also set between the third lens L3 and the fourth lens L4 Aperture STO.
  • the wide-angle lens 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and having an object side surface S13 and an image side surface S14, and a protective glass 120 disposed on the image side of the filter 110 and having an object side surface S15 and an image side surface S16.
  • the light from the object OBJ sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • the filter 110 is an infrared filter, which is used to filter the infrared light from the external light incident on the wide-angle lens 100 to avoid imaging distortion.
  • Table 6 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (ie dispersion coefficient) and effective focal length of each lens of the wide-angle lens 100 of Example 3, where the radius of curvature, thickness, The unit of the effective focal length of each lens is millimeter (mm).
  • Table 7 shows the coefficients of higher-order terms that can be used for the lens aspheric surfaces S1-S2 and S11-S12 in Example 3.
  • the aspheric surface type can be defined by the formula (1) given in Example 1;
  • Table 8 shows The relevant parameter values of the wide-angle lens 100 given in Embodiment 3 are shown.
  • the reference wavelength of the wide-angle lens 100 is 546.07 nm.
  • the longitudinal spherical aberration graph shows the deviation of the focal point of light with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm and 656.27nm after passing through the wide-angle lens 100;
  • the astigmatism graph shows that the light with a wavelength of 546.07nm passes through the wide-angle lens Meridional field curvature and sagittal field curvature after 100;
  • the distortion curve diagram shows the distortion of light with a wavelength of 546.07nm after passing through the wide-angle lens 100 at different angles of view. It can be seen from FIG. 6 that the wide-angle lens 100 provided in Embodiment 3 can achieve good imaging quality.
  • FIG. 7 shows a schematic structural diagram of a wide-angle lens 100 according to Embodiment 4 of the present application.
  • the wide-angle lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 in order from the object side to the image side along the optical axis. And imaging surface S17.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 and the image side surface S2 are both aspherical, wherein the object side surface S1 is a convex surface near the optical axis, and the image side surface S2 is a concave surface near the optical axis.
  • the second lens L2 has a negative refractive power, and the object side surface S3 and the image side surface S4 are both spherical surfaces, wherein the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface.
  • the third lens L3 has a positive refractive power, and the object side surface S5 and the image side surface S6 are both spherical surfaces, wherein the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens L4 has a negative refractive power, and the object side surface S7 and the image side surface S8 are both spherical surfaces, wherein the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens L5 has a positive refractive power
  • the object side surface S9 is a spherical surface
  • the image side surface S10 is a flat surface
  • the object side surface S9 is a convex surface.
  • the sixth lens L6 has a positive refractive power, and the object side surface S11 and the image side surface S12 are both aspherical, wherein the object side surface S11 is a concave surface near the optical axis, and the image side surface S12 is a convex surface near the optical axis.
  • the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 are cemented to form a cemented lens, thereby making the overall structure of the wide-angle lens 100 more compact, and reducing the sensitivity to tolerances such as tilt or eccentricity of the lens during assembly. Degree issues, improve the assembly yield of the lens.
  • the object and image sides of the first lens L1 and the sixth lens L6 are set to be aspherical surfaces, the materials of the first lens L1 to the sixth lens L6 are all glass, and there is also set between the third lens L3 and the fourth lens L4 Aperture STO.
  • the wide-angle lens 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and having an object side surface S13 and an image side surface S14, and a protective glass 120 disposed on the image side of the filter 110 and having an object side surface S15 and an image side surface S16.
  • the light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • the filter 110 is an infrared filter, which is used to filter the infrared light from the external light incident on the wide-angle lens 100 to avoid imaging distortion.
  • Table 9 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (ie dispersion coefficient) and effective focal length of each lens of the wide-angle lens 100 of Example 4, where the radius of curvature, thickness, The unit of the effective focal length of each lens is millimeter (mm).
  • Table 10 shows the coefficients of higher-order terms that can be used for the aspheric surfaces S1-S2 and S11-S12 of the lens in Example 4.
  • the aspheric surface type can be defined by the formula (1) given in Example 1;
  • Table 11 shows The relevant parameter values of the wide-angle lens 100 given in Embodiment 4 are shown.
  • FIG. 8 shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens 100 of Embodiment 4, and the reference wavelength of the wide-angle lens 100 is 546.07 nm.
  • the longitudinal spherical aberration graph shows the deviation of the focal point of light with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm and 656.27nm after passing through the wide-angle lens 100;
  • the astigmatism graph shows that the light with a wavelength of 546.07nm passes through the wide-angle lens Meridional field curvature and sagittal field curvature after 100;
  • the distortion curve diagram shows the distortion of light with a wavelength of 546.07nm after passing through the wide-angle lens 100 at different angles of view.
  • the wide-angle lens 100 provided in Embodiment 4 can achieve good imaging quality.
  • FIG. 9 shows a schematic structural diagram of a wide-angle lens 100 according to Embodiment 5 of the present application.
  • the wide-angle lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 in order from the object side to the image side along the optical axis. And imaging surface S17.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 and the image side surface S2 are both aspherical, wherein the object side surface S1 is a convex surface near the optical axis, and the image side surface S2 is a concave surface near the optical axis.
  • the second lens L2 has a negative refractive power, and the object side surface S3 and the image side surface S4 are both spherical surfaces, wherein the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface.
  • the third lens L3 has a positive refractive power, and the object side surface S5 and the image side surface S6 are both spherical surfaces, wherein the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens L4 has a negative refractive power, and the object side surface S7 and the image side surface S8 are both spherical surfaces, wherein the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens L5 has a positive refractive power
  • the object side surface S9 is a spherical surface
  • the image side surface S10 is a flat surface
  • the object side surface S9 is a convex surface.
  • the sixth lens L6 has a positive refractive power, and the object side surface S11 and the image side surface S12 are both aspherical, wherein the object side surface S11 is a concave surface near the optical axis, and the image side surface S12 is a convex surface near the optical axis.
  • the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 are cemented to form a cemented lens, thereby making the overall structure of the wide-angle lens 100 more compact, and reducing the sensitivity to tolerances such as tilt or eccentricity of the lens during assembly. Degree issues, improve the assembly yield of the lens.
  • the object and image sides of the first lens L1 and the sixth lens L6 are set to be aspherical surfaces, the materials of the first lens L1 to the sixth lens L6 are all glass, and there is also set between the third lens L3 and the fourth lens L4 Aperture STO.
  • the wide-angle lens 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and having an object side surface S13 and an image side surface S14, and a protective glass 120 disposed on the image side of the filter 110 and having an object side surface S15 and an image side surface S16.
  • the light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • the filter 110 is an infrared filter, which is used to filter the infrared light from the external light incident on the wide-angle lens 100 to avoid imaging distortion.
  • Table 12 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (ie dispersion coefficient) and effective focal length of each lens of the wide-angle lens 100 of Example 5, where the radius of curvature, thickness, The unit of the effective focal length of each lens is millimeter (mm).
  • Table 13 shows the coefficients of higher order terms that can be used for the aspheric surfaces S1-S2 and S11-S12 of the lens in Example 5.
  • the aspheric surface type can be defined by the formula (1) given in Example 1;
  • Table 14 shows The relevant parameter values of the wide-angle lens 100 given in Embodiment 5 are shown.
  • FIG. 10 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the wide-angle lens 100 of Embodiment 5, and the reference wavelength of the wide-angle lens 100 is 546.07 nm.
  • the longitudinal spherical aberration graph shows the deviation of the focal point of light with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm and 656.27nm after passing through the wide-angle lens 100;
  • the astigmatism graph shows that the light with a wavelength of 546.07nm passes through the wide-angle lens Meridional field curvature and sagittal field curvature after 100;
  • the distortion curve diagram shows the distortion of light with a wavelength of 546.07nm after passing through the wide-angle lens 100 at different angles of view. It can be seen from FIG. 10 that the wide-angle lens 100 provided in Embodiment 5 can achieve good imaging quality.
  • FIG. 11 shows a schematic structural diagram of a wide-angle lens 100 according to Embodiment 6 of the present application.
  • the wide-angle lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 in order from the object side to the image side along the optical axis. And imaging surface S17.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 and the image side surface S2 are both aspherical, wherein the object side surface S1 is a convex surface near the optical axis, and the image side surface S2 is a concave surface near the optical axis.
  • the second lens L2 has a negative refractive power, and the object side surface S3 and the image side surface S4 are both spherical surfaces, wherein the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface.
  • the third lens L3 has a positive refractive power, and the object side surface S5 and the image side surface S6 are both spherical surfaces, wherein the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens L4 has a negative refractive power, and the object side surface S7 and the image side surface S8 are both spherical surfaces, wherein the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens L5 has a positive refractive power
  • the object side surface S9 is a spherical surface
  • the image side surface S10 is a flat surface
  • the object side surface S9 is a convex surface.
  • the sixth lens L6 has a positive refractive power, and the object side surface S11 and the image side surface S12 are both aspherical, wherein the object side surface S11 is a concave surface near the optical axis, and the image side surface S12 is a convex surface near the optical axis.
  • the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 are cemented to form a cemented lens, thereby making the overall structure of the wide-angle lens 100 more compact, and reducing the sensitivity to tolerances such as tilt or eccentricity of the lens during assembly. Degree issues, improve the assembly yield of the lens.
  • the object and image sides of the first lens L1 and the sixth lens L6 are set to be aspherical surfaces, the materials of the first lens L1 to the sixth lens L6 are all glass, and there is also set between the third lens L3 and the fourth lens L4 Aperture STO.
  • the wide-angle lens 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and having an object side surface S13 and an image side surface S14, and a protective glass 120 disposed on the image side of the filter 110 and having an object side surface S15 and an image side surface S16.
  • the light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • the filter 110 is an infrared filter, which is used to filter the infrared light from the external light incident on the wide-angle lens 100 to avoid imaging distortion.
  • Table 15 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (ie, dispersion coefficient) and effective focal length of each lens of the wide-angle lens 100 of Example 6, where the radius of curvature, thickness, The unit of the effective focal length of each lens is millimeter (mm).
  • Table 16 shows the coefficients of the higher order terms applicable to the aspheric surfaces S1-S2 and S11-S12 of the lens in Example 6, where the aspheric surface type can be defined by the formula (1) given in Example 1;
  • Table 17 shows The relevant parameter values of the wide-angle lens 100 given in Embodiment 6 are shown.
  • FIG. 12 respectively shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the wide-angle lens 100 of Embodiment 6, and the reference wavelength of the wide-angle lens 100 is 546.07 nm.
  • the longitudinal spherical aberration graph shows the deviation of the focal point of light with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm and 656.27nm after passing through the wide-angle lens 100;
  • the astigmatism graph shows that the light with a wavelength of 546.07nm passes through the wide-angle lens Meridional field curvature and sagittal field curvature after 100;
  • the distortion curve diagram shows the distortion of light with a wavelength of 546.07nm after passing through the wide-angle lens 100 at different angles of view.
  • FIG. 12 it can be seen that the wide-angle lens 100 provided in Embodiment 6 can achieve good imaging quality.
  • FIG. 13 shows a schematic structural diagram of a wide-angle lens 100 according to Embodiment 7 of the present application.
  • the wide-angle lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 in order from the object side to the image side along the optical axis. And imaging surface S17.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 and the image side surface S2 are both aspherical surfaces, wherein the object side surface S1 is a convex surface near the optical axis, and the image side surface S2 is a concave surface near the optical axis.
  • the second lens L2 has a negative refractive power, and the object side surface S3 and the image side surface S4 are both spherical surfaces, wherein the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface.
  • the third lens L3 has a positive refractive power, and the object side surface S5 and the image side surface S6 are both spherical surfaces, wherein the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens L4 has a negative refractive power, and the object side surface S7 and the image side surface S8 are both spherical surfaces, wherein the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens L5 has a positive refractive power
  • the object side surface S9 is a spherical surface
  • the image side surface S10 is a flat surface
  • the object side surface S9 is a convex surface.
  • the sixth lens L6 has a positive refractive power, and the object side surface S11 and the image side surface S12 are both aspherical, wherein the object side surface S11 is a concave surface near the optical axis, and the image side surface S12 is a convex surface near the optical axis.
  • the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 are cemented to form a cemented lens, thereby making the overall structure of the wide-angle lens 100 more compact, and reducing the sensitivity to tolerances such as tilt or eccentricity of the lens during assembly. Degree issues, improve the assembly yield of the lens.
  • the object and image sides of the first lens L1 and the sixth lens L6 are set to be aspherical surfaces, the materials of the first lens L1 to the sixth lens L6 are all glass, and there is also set between the third lens L3 and the fourth lens L4 Aperture STO.
  • the wide-angle lens 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and having an object side surface S13 and an image side surface S14, and a protective glass 120 disposed on the image side of the filter 110 and having an object side surface S15 and an image side surface S16.
  • the light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • the filter 110 is an infrared filter, which is used to filter the infrared light from the external light incident on the wide-angle lens 100 to avoid imaging distortion.
  • Table 18 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (ie, dispersion coefficient) and effective focal length of each lens of the wide-angle lens 100 of Example 7, where the radius of curvature, thickness, The unit of the effective focal length of each lens is millimeter (mm).
  • Table 19 shows the coefficients of the higher order terms that can be used for the lens aspheric surfaces S1-S2 and S11-S12 in Example 7, where the aspheric surface type can be defined by the formula (1) given in Example 1;
  • Table 20 shows The relevant parameter values of the wide-angle lens 100 given in Embodiment 7 are shown.
  • FIG. 14 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the wide-angle lens 100 of Embodiment 7, respectively, and the reference wavelength of the wide-angle lens 100 is 546.07 nm.
  • the longitudinal spherical aberration graph shows the deviation of the focal point of light with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm and 656.27nm after passing through the wide-angle lens 100;
  • the astigmatism graph shows that the light with a wavelength of 546.07nm passes through the wide-angle lens Meridional field curvature and sagittal field curvature after 100;
  • the distortion curve diagram shows the distortion of light with a wavelength of 546.07nm after passing through the wide-angle lens 100 at different angles of view. It can be seen from FIG. 14 that the wide-angle lens 100 provided in Embodiment 7 can achieve good imaging quality.
  • the present application also provides an imaging module 200, including the wide-angle lens 100 as described above; and a photosensitive element 210, the photosensitive element 210 is arranged on the image side of the wide-angle lens 100, Surface S17 coincides.
  • the photosensitive element 210 may adopt a complementary metal oxide semiconductor (CMOS, Complementary Metal Oxide Semiconductor) image sensor or a charge-coupled device (CCD, Charge-coupled Device) image sensor.
  • CMOS complementary metal oxide semiconductor
  • CCD Charge-coupled Device
  • the above-mentioned imaging module 200 can use the aforementioned wide-angle lens 100 to capture high-definition images with a wide viewing angle. At the same time, the imaging module 200 also has the structural characteristics of miniaturization and light weight.
  • the imaging module 200 can be applied to fields such as mobile phones, automobiles, surveillance, and medical treatment. Specifically, it can be used as a mobile phone camera, a car camera, a surveillance camera or an endoscope, etc.
  • the above-mentioned imaging module 200 can be used as a vehicle-mounted camera in a driving device 300.
  • the driving device 300 may be an autonomous vehicle or a non-autonomous vehicle.
  • the imaging module 200 can be used as a front-view camera, a rear-view camera or a side-view camera of the driving device 300.
  • the driving device 300 includes a vehicle body 310, and the imaging module 200 is installed at any position of the left rearview mirror, right rearview mirror, rear trunk, front headlights, rear headlights, etc. of the vehicle body 310 to obtain the vehicle A clear image of the environment around the body 310.
  • the driving device 300 is also provided with a display screen 320, the display screen 320 is installed in the vehicle body 310, and the imaging module 200 is communicatively connected with the display screen 320, and the image information obtained by the imaging module 200 can be transmitted to the display screen 320.
  • the display so that the driver can obtain more complete surrounding image information, improve safety while driving.
  • the imaging module 200 may be applied to an autonomous vehicle.
  • the imaging module 200 is installed at any position on the body of the self-driving car.
  • the imaging module 200 can also be installed on the top of the vehicle body.
  • the imaging module 200 by installing multiple imaging modules 200 on the self-driving car to obtain environmental information with a 360° angle of view around the car body 310, the environmental information obtained by the imaging module 200 will be transmitted to the analysis and processing unit of the self-driving car for comparison.
  • the road conditions around the vehicle body 310 are analyzed in real time.
  • the present application also provides an electronic device 400 including a housing 410 and the imaging module 200 as described above, and the imaging module 200 is installed on the housing 410.
  • the imaging module 200 is disposed in the housing 410 and is exposed from the housing 410 to obtain images.
  • the housing 410 can provide the imaging module 200 with protection from dust, water, and drop.
  • the corresponding hole of the module 200 allows light to penetrate into or out of the housing from the hole.
  • the above-mentioned electronic device 400 can use the aforementioned imaging module 200 to capture images with a wide viewing angle and high pixels.
  • the above-mentioned electronic device 400 is further provided with a corresponding processing system, and the electronic device 400 can transmit the image to the corresponding processing system in time after taking an image of the object, so that the system can make accurate analysis and judgment.
  • the "electronic device” used may also include, but is not limited to, a device configured to be connected via a wired line and/or receive or send a communication signal via a wireless interface.
  • An electronic device set to communicate through a wireless interface may be referred to as a "wireless communication terminal", a “wireless terminal” or a “mobile terminal”.
  • mobile terminals include, but are not limited to satellite or cellular phones; personal communication system (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, and the Internet/ Personal digital assistant (PDA) with intranet access, web browser, notebook, calendar, and/or global positioning system (GPS) receiver; and conventional laptop and/or palmtop Receiver or other electronic device including a radio telephone transceiver.
  • PCS personal communication system
  • PDA Internet/ Personal digital assistant
  • GPS global positioning system

Abstract

一种广角镜头（100）、成像模组（200）、电子装置（400）及驾驶装置（300）。广角镜头（100）沿着光轴由物侧至像侧依序包括具有负屈折力的第一透镜（L1），物侧面近光轴处为凸面，像侧面近光轴处为凹面；具有负屈折力的第二透镜（L2），物侧面为凹面；具有正屈折力的第三透镜（L3）；具有负屈折力的第四透镜（L4），像侧面为凹面；具有正屈折力的第五透镜（L5），物侧面为凸面；具有正屈折力的第六透镜（L6）；以及光阑（STO），设于第六透镜（L6）的物侧。广角镜头（100）在满足关系式-2×10 -6/k＜dn5/dt5＜4.5×10 -6/k时，能够在具备广视角以及高解像能力的同时兼顾小型化，且成像品质受环境温度的影响较小。

Description

广角镜头、成像模组、电子装置及驾驶装置 技术领域
本申请涉及光学成像技术领域，特别是涉及一种广角镜头、成像模组、电子装置及驾驶装置。
背景技术
近年来，随着车载技术的发展，前视摄像装置、自动巡航仪、行车记录仪、倒车影像仪对车载用摄像头的技术要求越来越高。其中，前视摄像装置可作为高级驾驶员辅助系统中的摄像头系统分析视频内容，实现车道偏离警告(LDW)、自动车道保持辅助(LKA)、远光灯/近光灯控制和交通标志识别(TSR)。例如在停车时，前视摄像装置自动开启，驾驶员可直观地看到车前面的障碍物，从而方便停车操作；而当汽车通过特殊地方(如路障，停车场等)时，前视摄像装置也会可自动打开从而获取车辆周围的环境信息，并反馈给汽车中央系统使其做出正确的指令，避免驾驶事故的发生。
传统的车载镜头通常采用六片以上的透镜来获得较高的解像能力。但是，增加透镜数量会影响镜头的小型化，不利于镜头的安装使用，同时还会增加镜头的成本。另外，传统的前视广角镜头拍摄的图像分辨率较低，景深范围小，无法在呈现远距离细节的同时实现大角度范围的拍摄，从而不能使驾驶辅助系统实时准确地对车辆周围的环境信息进行判断进而做出及时的预警或规避，存在一定的驾驶风险。
发明内容
根据本申请的各种实施例，提供一种广角镜头。
一种广角镜头，所述广角镜头沿着光轴由物侧至像侧依序包括：
具有负屈折力的第一透镜，所述第一透镜的物侧面近光轴处为凸面，像侧面近光轴处为凹面；
具有负屈折力的第二透镜，所述第二透镜的物侧面为凹面；
具有正屈折力的第三透镜；
具有负屈折力的第四透镜，所述第四透镜的像侧面为凹面；
具有正屈折力的第五透镜，所述第五透镜的物侧面为凸面；
具有正屈折力的第六透镜；
以及光阑，所述光阑设于所述广角镜头的物侧或者所述第一透镜与所述第六透镜之间；
所述广角镜头满足下列关系式：
-2×10 -6/k＜dn5/dt5＜4.5×10 -6/k；其中，dn5/dt5表示所述第五透镜在20～40℃范围内的相对折射率温度系数。
一种成像模组，包括上述实施例所述的广角镜头；以及感光元件，所述感光元件设于所述广角镜头的像侧。
一种电子装置，包括壳体以及上述实施例所述的成像模组，所述成像模组安装在所述壳体上。
一种驾驶装置，包括车体以及上述实施例所述的成像模组，所述成像模组设于所述车体以获取所述车体周围的环境信息。
本申请的一个或多个实施例的细节在下面的附图和描述中提出。本申请的其他特征、目的和优点将从说明书、附图以及权利要求书变得明显。
附图说明
为了更好地描述和说明这里公开的那些发明的实施例或示例，可以参考一幅或多幅附图。用于描述附图的附加细节或示例不应当被认为是对所公开的发明、目前描述的实施例或示例以及目前理解的这些发明的最佳模式中的任何一者的范围的限制。
图1示出了本申请实施例1的广角镜头的结构示意图；
图2分别示出了实施例1的广角镜头的纵向球差曲线图、像散曲线图以及畸变曲线图；
图3示出了本申请实施例2的广角镜头的结构示意图；
图4分别示出了实施例2的广角镜头的纵向球差曲线图、像散曲线图以及畸变曲线图；
图5示出了本申请实施例3的广角镜头的结构示意图；
图6分别示出了实施例3的广角镜头的纵向球差曲线图、像散曲线图以及畸变曲线图；
图7示出了本申请实施例4的广角镜头的结构示意图；
图8分别示出了实施例4的广角镜头的纵向球差曲线图、像散曲线图以及畸变曲线图；
图9示出了本申请实施例5的广角镜头的结构示意图；
图10分别示出了实施例5的广角镜头的纵向球差曲线图、像散曲线图以及畸变曲线图；
图11示出了本申请实施例6的广角镜头的结构示意图；
图12分别示出了实施例6的广角镜头的纵向球差曲线图、像散曲线图 以及畸变曲线图；
图13示出了本申请实施例7的广角镜头的结构示意图；
图14分别示出了实施例7的广角镜头的纵向球差曲线图、像散曲线图以及畸变曲线图；
图15示出了本申请一实施例的成像模组的示意图；
图16示出了本申请一实施例的应用成像模组的驾驶装置示意图；
图17示出了本申请一实施例的应用成像模组的电子装置示意图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
需要说明的是，当元件被称为“设置于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的和所有的组合。
在本说明书中，第一、第二、第三等的表述仅用于将一个特征与另一个特征区分开来，而不表示对特征的任何限制。因此，在不背离本申请的教导的情况下，下文中讨论的第一透镜也可被称作第二透镜或第三透镜。为了便于说明，附图中所示的球面或非球面的形状通过示例的方式示出。即，球面或非球面的形状不限于附图中示出的球面或非球面的形状。附图仅为示例而并非严格按比例绘制。
在本说明书中，物体相对于光学元件所处的一侧空间称为该光学元件的物侧，对应的，物体所成的像相对于光学元件所处的一侧空间称为该光学元件的像侧。每个透镜中最靠近物体的表面称为物侧面，每个透镜中最靠近成像面的表面称为像侧面。
另外，在下文的描述中，若出现透镜表面为凸面且未界定该凸面位置时，则表示该透镜表面至少近光轴处为凸面；若透镜表面为凹面且未界定该凹面位置时，则表示该透镜表面至少近光轴处为凹面。此处近光轴处是 指光轴附近的区域。
高像素广角镜头能将捕捉的景物信息清晰地呈现在感光元件的感光面上，并传输到相应的系统进行识别处理，在倒车系统、自动驾驶系统以及监控系统中均起着十分重要的作用。然而传统的车载镜头在设计时较难兼顾小型化和高解像能力，使得镜头的制备成本较高，难于批量化生产。
针对以上方案所存在的缺陷，均是发明人在经过实践并仔细研究后得到的结果，因此，上述问题的发现过程以及下文中本申请实施例针对上述问题所提出的解决方案，都应是发明人在本申请过程中对本申请做出的贡献。
以下将对本申请的特征、原理和其他方面进行详细描述。
请一并参阅图1、图3、图5、图7、图9、图11和图13，本申请实施例提供一种可兼顾高像素以及小型化的广角镜头。具体的，该广角镜头包括六片具有屈折力的透镜，即第一透镜、第二透镜、第三透镜、第四透镜、第五透镜以及第六透镜。该六片透镜沿着光轴从物侧至像侧依序排列，广角镜头的成像面位于第六透镜的像侧。
第一透镜具有负屈折力，其物侧面近光轴处为凸面，像侧面近光轴处为凹面，从而有利于使大角度的光线入射到光学系统中，并通过光学系统中其他透镜的折射从而使光线会聚至系统的成像面，提高成像质量。
第二透镜具有负屈折力，其物侧面为凹面。通过调整第二透镜物侧面和像侧面的曲率半径有利于修正部分第一透镜产生的边缘像差，优化镜头的广角成像质量；同时也有利于抑制像散的产生，进一步提升成像品质。
第三透镜具有正屈折力，能够使由于第一透镜和第二透镜的强负屈折力所发散的光线得以会聚，使第三透镜和光阑的距离减小，从而使镜头的结构更为紧凑，容易实现透镜系统的小型化。
第四透镜具有负屈折力，第五透镜具有正屈折力，从而第五透镜可与第四透镜配合以校正镜头色差，并进一步修正像差，提升镜头的成像解析能力。进一步的，第四透镜的像侧面为凹面，第五透镜的物侧面为凸面，可将第四透镜的像侧面和第五透镜的物侧面胶合，如此可使广角镜头的整体结构更为紧凑，有利于修正像差，在缩小镜头体积和提高镜头解像力之间取得平衡，同时还可以降低镜片在组立过程中产生的倾斜或偏心等公差敏感度问题，提升镜头的组装良率。
如本领域技术人员已知的，在光线转折处的离散透镜，容易因加工误差和/或组立误差造成敏感，而胶合透镜的使用可有效地降低镜头的敏感度。在本申请中使用胶合透镜，不仅能够有效地降低镜头的敏感度、缩短镜头的整体长度，还能够分担镜头的整体色差、像差的矫正，提高广角镜 头的解像能力。进一步的，胶合透镜可包括一枚具有负屈折力的透镜和一枚具有正屈折力的透镜，如第四透镜具有负屈折力，第五透镜具有正屈折力。
第六透镜具有正屈折力，有利于降低主光线射出角度，减小光线射入芯片的角度，提高感光元件的感光性能；同时也有利于保证镜头的小型化特征。广角镜头中还设置有光阑，光阑设于广角镜头的物侧或者第一透镜与第六透镜之间，以更好地控制入射光束的大小，提升广角镜头的成像质量。进一步的，光阑设于第三透镜和第四透镜之间。具体的，光阑包括孔径光阑和视场光阑。优选的，光阑为孔径光阑。孔径光阑可位于透镜的表面上(例如物侧面和像侧面)，并与透镜形成作用关系，例如，通过在透镜的表面涂覆阻光涂层以在该表面形成孔径光阑；或通过夹持件固定夹持透镜的表面，位于该表面的夹持件结构能够限制轴上物点成像光束的宽度，从而在该表面上形成孔径光阑。
进一步的，广角镜头满足下列关系式：-2×10 -6/k＜dn5/dt5＜4.5×10 -6/k；其中，dn5/dt5表示第五透镜在20～40℃范围内的相对折射率温度系数。具体的，dn5/dt5可以是-1.5×10 -6/k、-1×10 -6/k、0.5×10 -6/k、2×10 -6/k、3×10 -6/k、4×10 -6/k、4.2×10 -6/k或4.3×10 -6/k。在满足上述关系式的条件下，能够使第五透镜的有效焦距满足高温伸长、低温缩短的特性，从而有利于补偿其他透镜的折射率变化，降低温度变化对镜头的解像能力的影响，保证不同温度下广角镜头成像性能的一致性。而当dn5/dt5低于下限或高于上限时，第五透镜的折射率受温度变化的影响较大，使得镜头的解像能力受温度的影响较大，容易降低成像品质。
当上述广角镜头用于成像时，被摄物体发出或者反射的光线从物侧方向进入广角镜头，并依次穿过第一透镜、第二透镜、第三透镜、第四透镜、第五透镜和第六透镜，最终汇聚到成像面上。
上述广角镜头，通过选取合适数量的透镜并合理分配各透镜的屈折力、面型以及各透镜的有效焦距，可以增强广角镜头的成像解析能力并有效修正像差，使其能够更精准地捕捉景物细节；同时通过第五透镜的相对折射率温度系数补偿温度变化对镜头解像能力的影响，保证不同温度下广角镜头成像性能的一致性。
在示例性实施方式中，第一透镜至第六透镜中，至少一个透镜的物侧面和/或像侧面为非球面。通过上述方式，可以提高透镜设计的灵活性，并有效地校正像差，提高广角镜头的成像质量。
在示例性实施方式中，第四透镜和第五透镜胶合，且广角镜头满足下列关系式：R45＞0；其中，R45表示第四透镜和第五透镜的胶合面于光轴 处的曲率半径。R45可以是2.3mm、2.4mm、2.45mm、2.5mm、2.55mm、2.6mm、2.65mm或2.7mm。将第四透镜和第五透镜胶合，可以使广角镜头的整体结构更为紧凑，降低镜片在组立过程中产生的倾斜或偏心等公差敏感度问题，提升镜头的组装良率；同时也有利于修正色差，进一步提升成像品质。
在示例性实施方式中，广角镜头满足下列关系式：-4＜f1/f＜0；其中，f1表示第一透镜的有效焦距，f表示广角镜头的有效焦距。f1/f可以是-3、-2.9、-2.8、-2.7、-2.6、-2.5、-2.4、-2、-1.5、-1.3或-1。在满足上述关系式的条件下，可以为镜头提供负的屈折力，并通过满足条件式的上限，第一透镜的负屈折力不会变的过强，从而有利于抑制因成像区域周边部的光束造成的高阶像差的发生；通过满足条件式的下限，能够确保第一透镜的负屈折力，从而抑制消色差效果的减小，使镜头具备高分辨性能。
在示例性实施方式中，广角镜头满足下列关系式：0＜f123/f＜4；其中，f123表示第一透镜、第二透镜和第三透镜的组合焦距，f表示广角镜头的有效焦距。f123/f可以是0.5、1、1.5、1.6、1.7、1.8、1.9、2、2.1、2.5、3或3.5。在满足上述关系式的条件下，有利于合理设置第一透镜、第二透镜和第三透镜的有效焦距，从而可以使镜头的结构更为紧凑，在保证广视角和低敏感的同时，实现小型化。而当f123/f小于0时，无法提供正的屈折力，不利于光线的会聚所需；而当f123/f大于等于4时，f123的正屈折力则过强，不利于高阶像差的修正。
在示例性实施方式中，广角镜头满足下列关系式：0＜(RS2-RS1)/f1＜1；其中，RS1表示第一透镜物侧面于光轴处的曲率半径，RS2表示第一透镜像侧面于光轴处的曲率半径，f1表示第一透镜的有效焦距。(RS2-RS1)/f1可以是0.2、0.24、0.25、0.26、0.27、0.28、0.29、0.3、0.4、0.6或0.8。在满足上述关系时，可以对第一透镜物侧面和像侧面的曲率半径进行合理设置，从而减小透镜的加工难度，降低加工过程中的偏心风险。而当(RS2-RS1)/f1小于等于0时，第一透镜的像侧面的曲率半径过大，不利于光线收集和像差修正；而当(RS2-RS1)/f1大于等于1时，第一透镜物侧面和像侧面的弯曲程度差异增大，加工难度上升，容易增加加工过程中的偏心风险。
在示例性实施方式中，广角镜头满足下列关系式：
-6＜(RS3+RS4)/(RS3-RS4)＜2；其中，RS3表示第二透镜物侧面于光轴处的曲率半径，RS4表示第二透镜像侧面于光轴处的曲率半径。(RS3+RS4)/(RS3-RS4)可以是-5.5、-5.4、-5.3、-5.2、-5.1、-5、-3、-1、1、1.3或1.5。在满足上述关系式的下限时，有利于减小边缘视场的主光线入射角度，从而使镜头更好地与感光元件匹配，提升成像质量；当满足 上述关系式的上限时，则有利于抑制像散，进一步提升成像品质。
在示例性实施方式中，广角镜头满足下列关系式：5＜|RS6|/|RS5|＜11；其中，RS5表示第三透镜物侧面于光轴处的曲率半径，RS6表示第三透镜像侧面于光轴处的曲率半径。|RS6|/|RS5|可以是5.2、5.5、6、6.5、7、7.5、8、8.5、9、9.5、10或10.5。在满足上述关系时，可以对第三透镜物侧面和像侧面的曲率半径进行合理设置，从而有利于控制透镜的弯曲程度，减小透镜的加工难度，降低加工过程中的偏心风险。而当|RS6|/|RS5|大于上限或低于下限时，均容易造成第三透镜物侧面和像侧面的弯曲程度差异过大，使得透镜的加工难度上升，增加加工过程中的偏心风险。
在示例性实施方式中，广角镜头满足下列关系式：4＜TTL/∑D＜5；其中，TTL表示第一透镜的物侧面至广角镜头的成像面在光轴上的距离，∑D表示第一透镜至第六透镜的各相邻透镜中前一透镜的像侧面至后一透镜的物侧面在光轴上的距离之和。TTL/∑D可以是4.1、4.2、4.3、4.4、4.5、4.6、4.7、4.8或4.9。在满足上述关系时，可以对各相邻透镜间的空气间隔进行合理配置，从而使镜头结构更为紧凑，实现镜头的小型化；同时上述设置也有利于增加镜头的热稳定性。而当TTL/∑D小于等于4时，各相邻透镜间的间距较大，不利于镜头组装，也不利于降低鬼影的产生；而当TTL/∑D大于等于5时，镜头总长较大，不利于小型化。
在示例性实施方式中，广角镜头满足下列关系式：1＜f456/f＜5；其中，f456表示第四透镜、第五透镜和第六透镜的组合焦距，f表示广角镜头的有效焦距。f456/f可以是1.4、1.8、1.9、2.0、2.1、2.2、2.5、3、3.5、4、4.5或4.8。在满足上述关系时，可以使第四透镜、第五透镜和第六透镜整体为镜头提供正屈折力，并根据上述关系合理配置各透镜的屈折力，有利于降低系统敏感度，提高生产良率，并确保系统的小型化特征，同时也有利于修正像差，在缩小体镜头积和提高镜头解像力之间取得平衡。而当f456/f超出下限或上限时，不利于镜头的小型化，也不利于镜头的像差修正。
在示例性实施方式中，广角镜头满足下列关系式：Vd3＞40，Vd5＞40；其中，Vd3表示第三透镜的d光阿贝数，Vd5表示第五透镜的d光阿贝数。具体的，d光指波长为587.56nm的光线。Vd3可以是42、44、46、48、50或52，Vd5可以是42、44、46、48、50、51、52、54或55。通过控制第三透镜和第五透镜的d光阿贝数满足上述关系，有利于校正镜头的轴外色差，从而提高镜头的分辨率，保证成像的清晰度。
在示例性实施方式中，广角镜头满足下列关系式：-2×10 -6/k＜dn5/dt5＜-0.1×10 -6/k。通过控制第五透镜在20～40℃范围内的相对折射率温度 系数进一步满足上述关系，可以更好地对透镜在不同温度下的折射率变化进行补偿，从而降低温度变化对镜头的解像能力的影响，保证不同温度下广角镜头成像性能的一致性。
在示例性实施方式中，广角镜头满足下列关系式：0＜|RS11/D6|＜4；其中，RS11表示第六透镜物侧面于光轴处的曲率半径，D6表示第六透镜在光轴上的厚度。|RS11/D6|可以是1、2、3、3.1、3.15、3.2、3.25、3.3、3.35、3.4、3.6或3.8。通过对第六透镜物侧面于光轴处的曲率半径和第六透镜在光轴上的厚度进行合理设置，可以在有效控制第六透镜弯曲程度的同时，抑制像差，优化镜头的广角成像品质。而当|RS11/D6|大于等于4时，容易造成第六透镜的物侧面过弯，从而增加透镜的加工难度，同时也不利于抑制镜头像差。
在示例性实施方式中，广角镜头满足下列关系式：
12mm＜TTL/tan(1/2FOV)＜21mm；其中，TTL表示第一透镜的物侧面至广角镜头的成像面在光轴上的距离，FOV表示广角镜头的对角线方向视场角。TTL/tan(1/2FOV)可以是12.1mm、12.2mm、12.3mm、12.4mm、12.5mm、12.6mm、12.7mm、15mm、18mm、20mm或20.5mm。在满足上述关系的条件下，可以使镜头更好的兼顾广角化和小型化。
在示例性实施方式中，广角镜头满足下列关系式：0＜ImgH/f＜3；其中，ImgH表示广角镜头的成像面上有效像素区域的对角线长度，f表示广角镜头的有效焦距。ImgH/f可以是1、1.1、1.2、1.25、1.3、1.4、1.5、2或2.5。通过合理设置广角镜头对角线方向的像高和广角镜头的有效焦距，可以使镜头的光学性能更加稳定，从而在满足小型化特征的同时，保证高像素的成像品质。
在示例性实施方式中，广角镜头中各透镜的材质可以均为玻璃或均为塑料，塑料材质的透镜能够减少广角镜头的重量并降低生产成本，而玻璃材质的透镜可使广角镜头具备较好的温度耐受特性以及优良的光学性能。进一步地，用于车载需要时，各透镜的材质优选为玻璃。需要注意的是，广角镜头中各透镜的材质也可以是玻璃和塑料的任意组合，并不一定要是均为玻璃或均为塑料。
在示例性实施方式中，广角镜头还包括红外滤光片。红外滤光片设于第六透镜的像侧，用于过滤入射光线，具体用于隔绝红外光，防止红外光被感光元件吸收，从而避免红外光对正常影像的色彩与清晰度造成影响，提高广角镜头的成像品质。
在示例性实施方式中，广角镜头还包括保护玻璃。保护玻璃设于红外滤光片的像侧，从而在后续组装成模组时能够靠近感光元件，起到保护感 光元件的作用。感光元件位于广角镜头的成像面上。进一步的，该成像面可以为感光元件的感光表面。
本申请的上述实施方式的广角镜头可采用多片镜片，例如上文所述的六片。通过合理分配各透镜焦距、屈折力、面型、厚度以及各透镜之间的轴上间距等，可以保证上述广角镜头的总长较小、重量较轻且具备较高的成像分辨率，同时还具备较大的光圈(FNO可以为1.6)以及较大的视场角，从而更好地满足如车载辅助系统的镜头、手机、平板等轻量化电子设备的应用需求。然而，本领域的技术人员应当理解，在未背离本申请要求保护的技术方案的情况下，可改变构成广角镜头的透镜数量，来获得本说明书中描述的各个结果和优点。
下面参照附图进一步描述可适用于上述实施方式的广角镜头的具体实施例。
实施例1
以下参照图1至图2描述本申请实施例1的广角镜头100。
图1示出了实施例1的广角镜头100的结构示意图。如图1所示，广角镜头100沿着光轴从物侧至像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6和成像面S17。
第一透镜L1具有负屈折力，其物侧面S1和像侧面S2均为非球面，其中物侧面S1近光轴处为凸面，像侧面S2近光轴处为凹面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为球面，其中物侧面S3为凹面，像侧面S4为凸面。
第三透镜L3具有正屈折力，其物侧面S5和像侧面S6均为球面，其中物侧面S5为凸面，像侧面S6为凸面。
第四透镜L4具有负屈折力，其物侧面S7为平面，像侧面S8为球面，其中像侧面S8为凹面。
第五透镜L5具有正屈折力，其物侧面S9和像侧面S10均为球面，其中物侧面S9为凸面，像侧面S10为凸面。
第六透镜L6具有正屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11近光轴处为凹面，像侧面S12近光轴处为凸面。
其中，第四透镜L4的像侧面S8和第五透镜L5的物侧面S9胶合形成胶合透镜，从而使广角镜头100的整体结构更为紧凑，降低透镜在组立过程中产生的倾斜或偏心等公差敏感度问题，提升镜头的组装良率。
将第一透镜L1以及第六透镜L6的物侧面和像侧面均设置为非球面，有利于修正像差、解决像面歪曲的问题，也能够使透镜在较小、较薄且较平的情况下实现优良的光学成像效果，进而使广角镜头100具备小型化特 性。
第一透镜L1至第六透镜L6的材质均为玻璃，使用玻璃材质的透镜可使广角镜头100具备较好的温度耐受特性以及优良的光学性能。
第三透镜L3和第四透镜L4之间还设置有光阑STO，以限制入射光束的大小，进一步提升广角镜头100的成像质量。广角镜头100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110以及设于滤光片110像侧且具有物侧面S15和像侧面S16的保护玻璃120。来自物体OBJ的光依序穿过各表面S1至S16并最终成像在成像面S17上。进一步的，滤光片110为红外滤光片，用以滤除入射至广角镜头100的外界光线中的红外光线，避免成像失真。具体的，滤光片110的材质为玻璃。滤光片110和保护玻璃120可以属于广角镜头100的一部分，与各透镜一同装配，或者也可在广角镜头100与感光元件装配时一同安装。
表1示出了实施例1的广角镜头100的透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和透镜的有效焦距，其中，曲率半径、厚度、透镜的有效焦距的单位均为毫米(mm)。透镜中最靠近物体的表面称为物侧面，透镜中最靠近成像面的表面称为像侧面。另外，以第一透镜L1为例，第一透镜L1的“厚度”参数列中的第一个数值为该透镜在光轴上的厚度，第二个数值为该透镜的像侧面至像侧方向的后一透镜的物侧面在光轴上的距离；光阑ST0于“厚度”参数列中的数值为光阑ST0至后一透镜的物侧面顶点(顶点指透镜与光轴的交点)于光轴上的距离，我们默认第一透镜L1物侧面到最后一枚镜片像侧面的方向为光轴的正方向，当该值为负时，表明光阑ST0设置于图1中该透镜的物侧面顶点的右侧，若光阑STO厚度为正值时，光阑在该透镜物侧面顶点的左侧。
表1
Figure PCTCN2020079774-appb-000001
Figure PCTCN2020079774-appb-000002
透镜中的非球面面型由以下公式限定：
Figure PCTCN2020079774-appb-000003
其中，x为非球面沿光轴方向在高度为h的位置时，距非球面顶点的距离矢高；c为非球面的近轴曲率，c＝1/R(即，近轴曲率c为表1中曲率半径R的倒数)；k为圆锥系数；Ai是非球面的第i阶系数。下表2给出了可用于实施例1中透镜非球面S1-S2以及S11-S12的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。
表2
Figure PCTCN2020079774-appb-000004
结合表1和表2中的数据可知，实施例1中的广角镜头100满足：
dn5/dt5＝-1.2×10 -6/k，其中，dn5/dt5表示第五透镜L5在20～40℃范围内的相对折射率温度系数；
R45＝2.631mm，其中，R45表示第四透镜L4和第五透镜L5的胶合面于光轴处的曲率半径；
f1/f＝-1.374，其中，f1表示第一透镜L1的有效焦距，f表示广角镜头100的有效焦距；
f123/f＝0.986，其中，f123表示第一透镜L1、第二透镜L2和第三透镜L3的组合焦距，f表示广角镜头100的有效焦距；
(RS2-RS1)/f1＝0.62，其中，RS1表示第一透镜L1物侧面S1于光轴处的曲率半径，RS2表示第一透镜L1像侧面S2于光轴处的曲率半径，f1表 示第一透镜L1的有效焦距；
(RS3+RS4)/(RS3-RS4)＝1.399，其中，RS3表示第二透镜L2物侧面S3于光轴处的曲率半径，RS4表示第二透镜L2像侧面S4于光轴处的曲率半径；
|RS6|/|RS5|＝5.273，其中，RS5表示第三透镜L3物侧面S5于光轴处的曲率半径，RS6表示第三透镜L3像侧面S6于光轴处的曲率半径；
TTL/∑D＝4.852，其中，TTL表示第一透镜L1的物侧面S1至广角镜头100的成像面S17在光轴上的距离，∑D表示第一透镜L1至第六透镜L6的各相邻透镜中前一透镜的像侧面至后一透镜的物侧面在光轴上的距离之和；
f456/f＝4.702，其中，f456表示第四透镜L4、第五透镜L5和第六透镜L6的组合焦距，f表示广角镜头100的有效焦距；
Vd3＝51.1，Vd5＝51.1，其中，Vd3表示第三透镜L3的d光阿贝数，Vd5表示第五透镜L5的d光阿贝数；
|RS11/D6|＝3.361，其中，RS11表示第六透镜L6物侧面S11于光轴处的曲率半径，D6表示第六透镜L6在光轴上的厚度；
TTL/tan(1/2FOV)＝20.134mm，其中，TTL表示第一透镜L1的物侧面S1至广角镜头100的成像面S17在光轴上的距离，本实施例中TTL为24mm，FOV表示广角镜头100的对角线方向视场角；
ImgH/f＝1.106，其中，ImgH表示广角镜头100的成像面S17上有效像素区域的对角线长度本，实施例中ImgH为5.762mm，f表示广角镜头100的有效焦距。
图2分别示出了实施例1的广角镜头100的纵向球差曲线图、像散曲线图以及畸变曲线图，广角镜头100的参考波长为546.07nm。其中纵向球差曲线图示出了波长为430nm、479.99nm、546.07nm、587.56nm以及656.27nm的光线经由广角镜头100后的会聚焦点偏离；像散曲线图示出了波长为546.07nm的光线经由广角镜头100后的子午像面弯曲和弧矢像面弯曲；畸变曲线图示出了波长为546.07nm的光线经由广角镜头100后在不同视场角下的畸变。根据图2可知，实施例1给出的广角镜头100能够实现良好的成像品质。
实施例2
以下参照图3至图4描述本申请实施例2的广角镜头100。在本实施例中，为简洁起见，将省略部分与实施例1相似的描述。图3示出了本申请实施例2的广角镜头100的结构示意图。
如图3所示，广角镜头100沿着光轴从物侧至像侧依序包括第一透镜 L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6和成像面S17。
第一透镜L1具有负屈折力，其物侧面S1和像侧面S2均为非球面，其中物侧面S1近光轴处为凸面，像侧面S2近光轴处为凹面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为球面，其中物侧面S3为凹面，像侧面S4为凸面。
第三透镜L3具有正屈折力，其物侧面S5和像侧面S6均为球面，其中物侧面S5为凸面，像侧面S6为凹面。
第四透镜L4具有负屈折力，其物侧面S7和像侧面S8均为球面，其中物侧面S7为凸面，像侧面S8为凹面。
第五透镜L5具有正屈折力，其物侧面S9和像侧面S10均为球面，其中物侧面S9为凸面，像侧面S10为凸面。
第六透镜L6具有正屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11近光轴处为凹面，像侧面S12近光轴处为凸面。
其中，第四透镜L4的像侧面S8和第五透镜L5的物侧面S9胶合形成胶合透镜，从而使广角镜头100的整体结构更为紧凑，降低透镜在组立过程中产生的倾斜或偏心等公差敏感度问题，提升镜头的组装良率。
第一透镜L1以及第六透镜L6的物侧面和像侧面均设置为非球面，第一透镜L1至第六透镜L6的材质均为玻璃，第三透镜L3和第四透镜L4之间还设置有光阑STO。广角镜头100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110以及设于滤光片110像侧且具有物侧面S15和像侧面S16的保护玻璃120。来自物体OBJ的光依序穿过各表面S1至S16并最终成像在成像面S17上。进一步的，滤光片110为红外滤光片，用以滤除入射至广角镜头100的外界光线中的红外光线，避免成像失真。
表3示出了实施例2的广角镜头100的各透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和各透镜的有效焦距，其中，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)。表4示出了可用于实施例2中透镜非球面S1-S2以及S11-S12的高次项系数，其中非球面面型可由实施例1中给出的公式(1)限定；表5示出了实施例2中给出的广角镜头100的相关参数数值。
表3
Figure PCTCN2020079774-appb-000005
Figure PCTCN2020079774-appb-000006
表4
Figure PCTCN2020079774-appb-000007
表5
Figure PCTCN2020079774-appb-000008
图4分别示出了实施例2的广角镜头100的纵向球差曲线图、像散曲线图以及畸变曲线图，广角镜头100的参考波长为546.07nm。其中纵向球差曲线图示出了波长为430nm、479.99nm、546.07nm、587.56nm以及656.27nm的光线经由广角镜头100后的会聚焦点偏离；像散曲线图示出了波长为546.07nm的光线经由广角镜头100后的子午像面弯曲和弧矢像面弯曲；畸变曲线图示出了波长为546.07nm的光线经由广角镜头100后在不同视场角下的畸变。根据图4可知，实施例2给出的广角镜头100能够实现良好的成像品质。
实施例3
以下参照图5至图6描述本申请实施例3的广角镜头100。在本实施例中，为简洁起见，将省略部分与实施例1相似的描述。图5示出了本申请实施例3的广角镜头100的结构示意图。
如图5所示，广角镜头100沿着光轴从物侧至像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6和成像面S17。
第一透镜L1具有负屈折力，其物侧面S1和像侧面S2均为非球面，其中物侧面S1近光轴处为凸面，像侧面S2近光轴处为凹面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为球面，其中物侧面S3为凹面，像侧面S4为凸面。
第三透镜L3具有正屈折力，其物侧面S5和像侧面S6均为球面，其中物侧面S5为凸面，像侧面S6为凹面。
第四透镜L4具有负屈折力，其物侧面S7和像侧面S8均为球面，其中物侧面S7为凸面，像侧面S8为凹面。
第五透镜L5具有正屈折力，其物侧面S9和像侧面S10均为球面，其中物侧面S9为凸面，像侧面S10为凸面。
第六透镜L6具有正屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11近光轴处为凹面，像侧面S12近光轴处为凸面。
其中，第四透镜L4的像侧面S8和第五透镜L5的物侧面S9胶合形成胶合透镜，从而使广角镜头100的整体结构更为紧凑，降低透镜在组立过程中产生的倾斜或偏心等公差敏感度问题，提升镜头的组装良率。
第一透镜L1以及第六透镜L6的物侧面和像侧面均设置为非球面，第一透镜L1至第六透镜L6的材质均为玻璃，第三透镜L3和第四透镜L4之间还设置有光阑STO。广角镜头100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110以及设于滤光片110像侧且具有物侧面S15和像侧面S16的保护玻璃120。来自物体OBJ的光依序穿过各表面 S1至S16并最终成像在成像面S17上。进一步的，滤光片110为红外滤光片，用以滤除入射至广角镜头100的外界光线中的红外光线，避免成像失真。
表6示出了实施例3的广角镜头100的各透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和各透镜的有效焦距，其中，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)。表7示出了可用于实施例3中透镜非球面S1-S2以及S11-S12的高次项系数，其中非球面面型可由实施例1中给出的公式(1)限定；表8示出了实施例3中给出的广角镜头100的相关参数数值。
表6
Figure PCTCN2020079774-appb-000009
表7
Figure PCTCN2020079774-appb-000010
Figure PCTCN2020079774-appb-000011
表8
Figure PCTCN2020079774-appb-000012
图6分别示出了实施例3的广角镜头100的纵向球差曲线图、像散曲线图以及畸变曲线图，广角镜头100的参考波长为546.07nm。其中纵向球差曲线图示出了波长为430nm、479.99nm、546.07nm、587.56nm以及656.27nm的光线经由广角镜头100后的会聚焦点偏离；像散曲线图示出了波长为546.07nm的光线经由广角镜头100后的子午像面弯曲和弧矢像面弯曲；畸变曲线图示出了波长为546.07nm的光线经由广角镜头100后在不同视场角下的畸变。根据图6可知，实施例3给出的广角镜头100能够实现良好的成像品质。
实施例4
以下参照图7至图8描述本申请实施例4的广角镜头100。在本实施例中，为简洁起见，将省略部分与实施例1相似的描述。图7示出了本申请实施例4的广角镜头100的结构示意图。
如图7所示，广角镜头100沿着光轴从物侧至像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6和成像面S17。
第一透镜L1具有负屈折力，其物侧面S1和像侧面S2均为非球面，其中物侧面S1近光轴处为凸面，像侧面S2近光轴处为凹面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为球面，其中物侧面S3为凹面，像侧面S4为凸面。
第三透镜L3具有正屈折力，其物侧面S5和像侧面S6均为球面，其中物侧面S5为凸面，像侧面S6为凹面。
第四透镜L4具有负屈折力，其物侧面S7和像侧面S8均为球面，其中 物侧面S7为凸面，像侧面S8为凹面。
第五透镜L5具有正屈折力，其物侧面S9为球面，像侧面S10为平面，其中物侧面S9为凸面。
第六透镜L6具有正屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11近光轴处为凹面，像侧面S12近光轴处为凸面。
其中，第四透镜L4的像侧面S8和第五透镜L5的物侧面S9胶合形成胶合透镜，从而使广角镜头100的整体结构更为紧凑，降低透镜在组立过程中产生的倾斜或偏心等公差敏感度问题，提升镜头的组装良率。
第一透镜L1以及第六透镜L6的物侧面和像侧面均设置为非球面，第一透镜L1至第六透镜L6的材质均为玻璃，第三透镜L3和第四透镜L4之间还设置有光阑STO。广角镜头100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110以及设于滤光片110像侧且具有物侧面S15和像侧面S16的保护玻璃120。来自物体OBJ的光依序穿过各表面S1至S16并最终成像在成像面S17上。进一步的，滤光片110为红外滤光片，用以滤除入射至广角镜头100的外界光线中的红外光线，避免成像失真。
表9示出了实施例4的广角镜头100的各透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和各透镜的有效焦距，其中，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)。表10示出了可用于实施例4中透镜非球面S1-S2以及S11-S12的高次项系数，其中非球面面型可由实施例1中给出的公式(1)限定；表11示出了实施例4中给出的广角镜头100的相关参数数值。
表9
Figure PCTCN2020079774-appb-000013
Figure PCTCN2020079774-appb-000014
表10
Figure PCTCN2020079774-appb-000015
表11
Figure PCTCN2020079774-appb-000016
图8分别示出了实施例4的广角镜头100的纵向球差曲线图、像散曲线图以及畸变曲线图，广角镜头100的参考波长为546.07nm。其中纵向球差曲线图示出了波长为430nm、479.99nm、546.07nm、587.56nm以及656.27nm的光线经由广角镜头100后的会聚焦点偏离；像散曲线图示出了波长为546.07nm的光线经由广角镜头100后的子午像面弯曲和弧矢像面弯曲；畸变曲线图示出了波长为546.07nm的光线经由广角镜头100后在不同视场角下的畸变。根据图8可知，实施例4给出的广角镜头100能够实现良好的成像品质。
实施例5
以下参照图9至图10描述本申请实施例5的广角镜头100。在本实施例中，为简洁起见，将省略部分与实施例1相似的描述。图9示出了本申请实施例5的广角镜头100的结构示意图。
如图9所示，广角镜头100沿着光轴从物侧至像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6和成像面S17。
第一透镜L1具有负屈折力，其物侧面S1和像侧面S2均为非球面，其中物侧面S1近光轴处为凸面，像侧面S2近光轴处为凹面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为球面，其中物侧面S3为凹面，像侧面S4为凸面。
第三透镜L3具有正屈折力，其物侧面S5和像侧面S6均为球面，其中物侧面S5为凸面，像侧面S6为凹面。
第四透镜L4具有负屈折力，其物侧面S7和像侧面S8均为球面，其中物侧面S7为凸面，像侧面S8为凹面。
第五透镜L5具有正屈折力，其物侧面S9为球面，像侧面S10为平面，其中物侧面S9为凸面。
第六透镜L6具有正屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11近光轴处为凹面，像侧面S12近光轴处为凸面。
其中，第四透镜L4的像侧面S8和第五透镜L5的物侧面S9胶合形成胶合透镜，从而使广角镜头100的整体结构更为紧凑，降低透镜在组立过程中产生的倾斜或偏心等公差敏感度问题，提升镜头的组装良率。
第一透镜L1以及第六透镜L6的物侧面和像侧面均设置为非球面，第一透镜L1至第六透镜L6的材质均为玻璃，第三透镜L3和第四透镜L4之间还设置有光阑STO。广角镜头100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110以及设于滤光片110像侧且具有物侧面S15和像侧面S16的保护玻璃120。来自物体OBJ的光依序穿过各表面S1至S16并最终成像在成像面S17上。进一步的，滤光片110为红外滤光片，用以滤除入射至广角镜头100的外界光线中的红外光线，避免成像失真。
表12示出了实施例5的广角镜头100的各透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和各透镜的有效焦距，其中，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)。表13示出了可用于实施例5中透镜非球面S1-S2以及S11-S12的高次项系数，其中非球面面型可由实施例1中给出的公式(1)限定；表14示出了实施例5中 给出的广角镜头100的相关参数数值。
表12
Figure PCTCN2020079774-appb-000017
表13
Figure PCTCN2020079774-appb-000018
表14
Figure PCTCN2020079774-appb-000019
Figure PCTCN2020079774-appb-000020
图10分别示出了实施例5的广角镜头100的纵向球差曲线图、像散曲线图以及畸变曲线图，广角镜头100的参考波长为546.07nm。其中纵向球差曲线图示出了波长为430nm、479.99nm、546.07nm、587.56nm以及656.27nm的光线经由广角镜头100后的会聚焦点偏离；像散曲线图示出了波长为546.07nm的光线经由广角镜头100后的子午像面弯曲和弧矢像面弯曲；畸变曲线图示出了波长为546.07nm的光线经由广角镜头100后在不同视场角下的畸变。根据图10可知，实施例5给出的广角镜头100能够实现良好的成像品质。
实施例6
以下参照图11至图12描述本申请实施例6的广角镜头100。在本实施例中，为简洁起见，将省略部分与实施例1相似的描述。图11示出了本申请实施例6的广角镜头100的结构示意图。
如图11所示，广角镜头100沿着光轴从物侧至像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6和成像面S17。
第一透镜L1具有负屈折力，其物侧面S1和像侧面S2均为非球面，其中物侧面S1近光轴处为凸面，像侧面S2近光轴处为凹面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为球面，其中物侧面S3为凹面，像侧面S4为凸面。
第三透镜L3具有正屈折力，其物侧面S5和像侧面S6均为球面，其中物侧面S5为凸面，像侧面S6为凹面。
第四透镜L4具有负屈折力，其物侧面S7和像侧面S8均为球面，其中物侧面S7为凸面，像侧面S8为凹面。
第五透镜L5具有正屈折力，其物侧面S9为球面，像侧面S10为平面，其中物侧面S9为凸面。
第六透镜L6具有正屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11近光轴处为凹面，像侧面S12近光轴处为凸面。
其中，第四透镜L4的像侧面S8和第五透镜L5的物侧面S9胶合形成胶合透镜，从而使广角镜头100的整体结构更为紧凑，降低透镜在组立过程中产生的倾斜或偏心等公差敏感度问题，提升镜头的组装良率。
第一透镜L1以及第六透镜L6的物侧面和像侧面均设置为非球面，第一透镜L1至第六透镜L6的材质均为玻璃，第三透镜L3和第四透镜L4之间还设置有光阑STO。广角镜头100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110以及设于滤光片110像侧且具有物侧面S15和像侧面S16的保护玻璃120。来自物体OBJ的光依序穿过各表面S1至S16并最终成像在成像面S17上。进一步的，滤光片110为红外滤光片，用以滤除入射至广角镜头100的外界光线中的红外光线，避免成像失真。
表15示出了实施例6的广角镜头100的各透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和各透镜的有效焦距，其中，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)。表16示出了可用于实施例6中透镜非球面S1-S2以及S11-S12的高次项系数，其中非球面面型可由实施例1中给出的公式(1)限定；表17示出了实施例6中给出的广角镜头100的相关参数数值。
表15
Figure PCTCN2020079774-appb-000021
表16
Figure PCTCN2020079774-appb-000022
Figure PCTCN2020079774-appb-000023
表17
Figure PCTCN2020079774-appb-000024
图12分别示出了实施例6的广角镜头100的纵向球差曲线图、像散曲线图以及畸变曲线图，广角镜头100的参考波长为546.07nm。其中纵向球差曲线图示出了波长为430nm、479.99nm、546.07nm、587.56nm以及656.27nm的光线经由广角镜头100后的会聚焦点偏离；像散曲线图示出了波长为546.07nm的光线经由广角镜头100后的子午像面弯曲和弧矢像面弯曲；畸变曲线图示出了波长为546.07nm的光线经由广角镜头100后不同视场角下的畸变。根据图12可知，实施例6给出的广角镜头100能够实现良好的成像品质。
实施例7
以下参照图13至图14描述本申请实施例7的广角镜头100。在本实施例中，为简洁起见，将省略部分与实施例1相似的描述。图13示出了本申请实施例7的广角镜头100的结构示意图。
如图13所示，广角镜头100沿着光轴从物侧至像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6和成像面S17。
第一透镜L1具有负屈折力，其物侧面S1和像侧面S2均为非球面，其 中物侧面S1近光轴处为凸面，像侧面S2近光轴处为凹面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为球面，其中物侧面S3为凹面，像侧面S4为凸面。
第三透镜L3具有正屈折力，其物侧面S5和像侧面S6均为球面，其中物侧面S5为凸面，像侧面S6为凹面。
第四透镜L4具有负屈折力，其物侧面S7和像侧面S8均为球面，其中物侧面S7为凸面，像侧面S8为凹面。
第五透镜L5具有正屈折力，其物侧面S9为球面，像侧面S10为平面，其中物侧面S9为凸面。
第六透镜L6具有正屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11近光轴处为凹面，像侧面S12近光轴处为凸面。
其中，第四透镜L4的像侧面S8和第五透镜L5的物侧面S9胶合形成胶合透镜，从而使广角镜头100的整体结构更为紧凑，降低透镜在组立过程中产生的倾斜或偏心等公差敏感度问题，提升镜头的组装良率。
第一透镜L1以及第六透镜L6的物侧面和像侧面均设置为非球面，第一透镜L1至第六透镜L6的材质均为玻璃，第三透镜L3和第四透镜L4之间还设置有光阑STO。广角镜头100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110以及设于滤光片110像侧且具有物侧面S15和像侧面S16的保护玻璃120。来自物体OBJ的光依序穿过各表面S1至S16并最终成像在成像面S17上。进一步的，滤光片110为红外滤光片，用以滤除入射至广角镜头100的外界光线中的红外光线，避免成像失真。
表18示出了实施例7的广角镜头100的各透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和各透镜的有效焦距，其中，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)。表19示出了可用于实施例7中透镜非球面S1-S2以及S11-S12的高次项系数，其中非球面面型可由实施例1中给出的公式(1)限定；表20示出了实施例7中给出的广角镜头100的相关参数数值。
表18
Figure PCTCN2020079774-appb-000025
Figure PCTCN2020079774-appb-000026
表19
Figure PCTCN2020079774-appb-000027
表20
Figure PCTCN2020079774-appb-000028
图14分别示出了实施例7的广角镜头100的纵向球差曲线图、像散曲线图以及畸变曲线图，广角镜头100的参考波长为546.07nm。其中纵向球 差曲线图示出了波长为430nm、479.99nm、546.07nm、587.56nm以及656.27nm的光线经由广角镜头100后的会聚焦点偏离；像散曲线图示出了波长为546.07nm的光线经由广角镜头100后的子午像面弯曲和弧矢像面弯曲；畸变曲线图示出了波长为546.07nm的光线经由广角镜头100后不同视场角下的畸变。根据图14可知，实施例7给出的广角镜头100能够实现良好的成像品质。
如图15所示，本申请还提供一种成像模组200，包括如前文所述的广角镜头100；以及感光元件210，感光元件210设于广角镜头100的像侧，感光元件210的感光表面与成像面S17重合。具体的，感光元件210可以采用互补金属氧化物半导体(CMOS，Complementary Metal Oxide Semiconductor)图像传感器或者电荷耦合元件(CCD,Charge-coupled Device)图像传感器。
上述成像模组200利用前述的广角镜头100能够拍摄得到高清晰、视角广的图像，同时成像模组200还具有小型化、轻量化的结构特点。成像模组200可应用于手机、汽车、监控、医疗等领域。具体可作为手机摄像头、车载摄像头、监控摄像头或内窥镜等。
如图16所示，上述成像模组200可作为车载摄像头应用于驾驶装置300中。驾驶装置300可以为自动驾驶汽车或非自动驾驶汽车。成像模组200可作为驾驶装置300的前视摄像头、后视摄像头或侧视摄像头。具体的，驾驶装置300包括车体310，成像模组200安装于车体的310的左后视镜、右后视镜、后尾箱、前大灯、后大灯等任意位置，以获取车体310周围的清晰的环境图像。此外，驾驶装置300中还设置有显示屏320，显示屏320安装于车体310内，且成像模组200与显示屏320通信连接，成像模组200所获得的影像信息能够传输至显示屏320中显示，从而使司机能够获得更完整的周边影像信息，提高驾驶时的安全保障。
特别地，在一些实施例中，成像模组200可应用于自动驾驶汽车上。继续参考图16，成像模组200安装于自动驾驶汽车车体上的任意位置，具体可参考上述实施例驾驶装置300中成像模组200的安装位置。对于自动驾驶汽车而言，成像模组200还可安装于车体的顶部。此时，通过在自动驾驶汽车上安装多个成像模组200以获得车体310周围360°视角的环境信息，成像模组200获得的环境信息将被传递至自动驾驶汽车的分析处理单元以对车体310周围的道路状况进行实时分析。通过采用成像模组200，可提高分析处理单元识别分析的准确性，从而提升自动驾驶时的安全性能。
如图17所示，本申请还提供一种电子装置400，包括壳体410以及如前文所述的成像模组200，成像模组200安装在壳体410上。具体的，成 像模组200设置在壳体410内并从壳体410暴露以获取图像，壳体410可以给成像模组200提供防尘、防水防摔等保护，壳体410上开设有与成像模组200对应的孔，以使光线从孔中穿入或穿出壳体。
上述电子装置400，利用前述的成像模组200能够拍摄得到视角广、像素高的图像。在另一些实施方式中，上述电子装置400还设置有对应的处理系统，电子装置400在拍摄物体图像后可及时地将图像传送至对应的处理系统，以便系统做出准确的分析和判断。
另一些实施方式中，所使用到的“电子装置”还可包括，但不限于被设置成经由有线线路连接和/或经由无线接口接收或发送通信信号的装置。被设置成通过无线接口通信的电子装置可以被称为“无线通信终端”、“无线终端”或“移动终端”。移动终端的示例包括，但不限于卫星或蜂窝电话；可以组合蜂窝无线电电话与数据处理、传真以及数据通信能力的个人通信系统(personal communication system，PCS)终端；可以包括无线电电话、寻呼机、因特网/内联网接入、Web浏览器、记事簿、日历以及/或全球定位系统(global positioning system,GPS)接收器的个人数字助理(personal digital assistant，PDA)；以及常规膝上型和/或掌上型接收器或包括无线电电话收发器的其它电子装置。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请的保护范围应以所附权利要求为准。

Claims (18)

  1. 一种广角镜头，其特征在于，所述广角镜头沿着光轴由物侧至像侧依序包括：
    具有负屈折力的第一透镜，所述第一透镜的物侧面近光轴处为凸面，像侧面近光轴处为凹面；
    具有负屈折力的第二透镜，所述第二透镜的物侧面为凹面；
    具有正屈折力的第三透镜；
    具有负屈折力的第四透镜，所述第四透镜的像侧面为凹面；
    具有正屈折力的第五透镜，所述第五透镜的物侧面为凸面；
    具有正屈折力的第六透镜；以及，
    光阑，所述光阑设于所述广角镜头的物侧或者所述第一透镜与所述第六透镜之间；
    所述广角镜头满足下列关系式：
    -2×10 -6/k＜dn5/dt5＜4.5×10 -6/k；
    其中，dn5/dt5表示所述第五透镜在20～40℃范围内的相对折射率温度系数。
  2. 根据权利要求1所述的广角镜头，其特征在于，所述第一透镜至所述第六透镜中，至少一个透镜的物侧面和/或像侧面为非球面。
  3. 根据权利要求1所述的广角镜头，其特征在于，所述第四透镜和所述第五透镜胶合，且所述广角镜头满足下列关系式：
    R45＞0；
    其中，R45表示所述第四透镜和所述第五透镜的胶合面于光轴处的曲率半径，单位为mm。
  4. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    -4＜f1/f＜0；
    其中，f1表示所述第一透镜的有效焦距，f表示所述广角镜头的有效焦距。
  5. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    0＜f123/f＜4；
    其中，f123表示所述第一透镜、所述第二透镜和所述第三透镜的组合焦距，f表示所述广角镜头的有效焦距。
  6. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    0＜(RS2-RS1)/f1＜1；
    其中，RS1表示所述第一透镜物侧面于光轴处的曲率半径，RS2表示所述第一透镜像侧面于光轴处的曲率半径，f1表示所述第一透镜的有效焦距。
  7. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    -6＜(RS3+RS4)/(RS3-RS4)＜2；
    其中，RS3表示所述第二透镜物侧面于光轴处的曲率半径，RS4表示所述第二透镜像侧面于光轴处的曲率半径。
  8. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    5＜|RS6|/|RS5|＜11；
    其中，RS5表示所述第三透镜物侧面于光轴处的曲率半径，RS6表示所述第三透镜像侧面于光轴处的曲率半径。
  9. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    4＜TTL/∑D＜5；
    其中，TTL表示所述第一透镜的物侧面至所述广角镜头的成像面在光轴上的距离，∑D表示所述第一透镜至所述第六透镜的各相邻透镜中前一透镜的像侧面至后一透镜的物侧面在光轴上的距离之和。
  10. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    1＜f456/f＜5；
    其中，f456表示所述第四透镜、所述第五透镜和所述第六透镜的组合焦距，f表示所述广角镜头的有效焦距。
  11. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    Vd3＞40，Vd5＞40；
    其中，Vd3表示所述第三透镜的d光阿贝数，Vd5表示所述第五透镜的d光阿贝数。
  12. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：-2×10 -6/k＜dn5/dt5＜-0.1×10 -6/k。
  13. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    0＜|RS11/D6|＜4；
    其中，RS11表示所述第六透镜物侧面于光轴处的曲率半径，D6表示所述第六透镜在光轴上的厚度。
  14. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    12mm＜TTL/tan(1/2FOV)＜21mm；
    其中，TTL表示所述第一透镜的物侧面至所述广角镜头的成像面在光轴上的距离，FOV表示所述广角镜头的对角线方向视场角。
  15. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足下列关系式：
    0＜ImgH/f＜3；
    其中，ImgH表示所述广角镜头的成像面上有效像素区域的对角线长度，f表示所述广角镜头的有效焦距。
  16. 一种成像模组，其特征在于，包括如权利要求1-15任一项所述的广角镜头以及感光元件，所述感光元件设于所述广角镜头的像侧。
  17. 一种电子装置，其特征在于，包括壳体以及如权利要求16所述的成像模组，所述成像模组安装在所述壳体上。
  18. 一种驾驶装置，其特征在于，包括车体以及如权利要求16所述的成像模组，所述成像模组设于所述车体以获取所述车体周围的环境信息。
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114859526A (zh) * 2022-05-26 2022-08-05 惠州市星聚宇光学有限公司 红外广角镜头以及红外广角镜头模组
CN117389011A (zh) * 2023-12-12 2024-01-12 联创电子科技股份有限公司 光学镜头

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204302561U (zh) * 2013-12-17 2015-04-29 富士胶片株式会社 摄像镜头以及摄像装置
JP2017211575A (ja) * 2016-05-27 2017-11-30 マクセルホールディングス株式会社 撮像レンズ系及び撮像装置
CN107621685A (zh) * 2017-11-08 2018-01-23 广东弘景光电科技股份有限公司 车载监控光学系统
CN108037577A (zh) * 2017-12-08 2018-05-15 深圳市莱通光学科技有限公司 一种取像镜头
CN108254858A (zh) * 2016-12-28 2018-07-06 株式会社腾龙 光学系统及拍摄装置
CN110161662A (zh) * 2019-07-16 2019-08-23 江西联创电子有限公司 广角镜头及应用该广角镜头的成像设备

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204302561U (zh) * 2013-12-17 2015-04-29 富士胶片株式会社 摄像镜头以及摄像装置
JP2017211575A (ja) * 2016-05-27 2017-11-30 マクセルホールディングス株式会社 撮像レンズ系及び撮像装置
CN108254858A (zh) * 2016-12-28 2018-07-06 株式会社腾龙 光学系统及拍摄装置
CN107621685A (zh) * 2017-11-08 2018-01-23 广东弘景光电科技股份有限公司 车载监控光学系统
CN108037577A (zh) * 2017-12-08 2018-05-15 深圳市莱通光学科技有限公司 一种取像镜头
CN110161662A (zh) * 2019-07-16 2019-08-23 江西联创电子有限公司 广角镜头及应用该广角镜头的成像设备

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114859526A (zh) * 2022-05-26 2022-08-05 惠州市星聚宇光学有限公司 红外广角镜头以及红外广角镜头模组
CN114859526B (zh) * 2022-05-26 2024-04-05 广东省星聚宇光学股份有限公司 红外广角镜头以及红外广角镜头模组
CN117389011A (zh) * 2023-12-12 2024-01-12 联创电子科技股份有限公司 光学镜头
CN117389011B (zh) * 2023-12-12 2024-03-19 联创电子科技股份有限公司 光学镜头

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