Optical systems, imaging modules and electronic equipment

Abstract

The present invention relates to an optical system, an imaging module and an electronic device. The optical system includes, from the object side to the image side, a first lens with negative refractive power, the object side surface of the first lens is convex, and the image side surface is concave; a second lens with negative refractive power, the object side surface of the second lens is concave; a third lens with positive refractive power, the object side surface of the third lens is convex, and the image side surface is convex; a fourth lens with positive refractive power, the object side surface of the fourth lens is convex, and the image side surface is convex; a fifth lens with negative refractive power, the image side surface of the fifth lens is convex; a sixth lens with positive refractive power; and the optical system satisfies the following conditional formula: ‑11≤f123 / f≤‑9; wherein f123 is the combined focal length of the first lens, the second lens and the third lens, and f is the effective focal length of the optical system. When the above relationship is met, it is conducive to achieving wide-angle of the optical system.

Description

Technical Field

[0001] The present invention relates to the field of photography, and in particular to an optical system, an imaging module and electronic equipment. Background Art

[0002] At present, with the rise of surround view cameras, advanced driver assistance systems (ADAS) and unmanned driving markets, automotive lenses are increasingly used in automotive assisted driving systems. For example, the panoramic parking assistance system uses a wide-angle automotive camera lens to provide the driver with a 360° real-time bird's-eye view of the vehicle's surroundings, so that the driver can park easily by observing the real-time video image. However, with the continuous improvement of automobile safety requirements, the requirements for wide-angle automotive lenses are also getting higher and higher, and the current field of view of automotive lenses needs to be improved. Summary of the invention

[0003] Based on this, it is necessary to provide an optical system, an imaging module and an electronic device to improve the field of view of the optical system.

[0004] An optical system, comprising, from the object side to the image side, the following:

[0005] A first lens having negative refractive power, wherein the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis;

[0006] a second lens having negative refractive power, wherein the object side surface of the second lens is concave at a near optical axis;

[0007] a third lens having positive refractive power, wherein the object side surface of the third lens is convex at the near optical axis, and the image side surface of the third lens is convex at the near optical axis;

[0008] Aperture;

[0009] a fourth lens having positive refractive power, wherein the object-side surface of the fourth lens is convex at the near optical axis, and the image-side surface of the fourth lens is convex at the near optical axis;

[0010] a fifth lens having negative refractive power, wherein the image side surface of the fifth lens is convex at a position close to the optical axis, and the object side surface and the image side surface of the fifth lens are both aspherical surfaces;

[0011] a sixth lens element having positive refractive power;

[0012] And the optical system satisfies the following conditional formula:

[0013] -11≤f123 / f≤-9;

[0014] Wherein, f123 is the combined focal length of the first lens, the second lens and the third lens, and f is the effective focal length of the optical system.

[0015] When the above optical system satisfies the above relationship, the front lens group composed of the first lens, the second lens and the third lens provides negative refractive power for the optical system to effectively deflect the light of a large-angle field of view, which is beneficial for the large-angle light beam to pass through the aperture to achieve the wide-angle of the optical system and improve the image brightness of the large-angle field of view of the optical system. If the upper limit of the above conditional expression is exceeded, the refractive power of the front lens group is too strong, which makes it easy for the large-angle edge field of view of the optical system to produce serious astigmatism and reduce the edge resolution ability. If the lower limit of the above conditional expression is lower than the lower limit of the above conditional expression, the refractive power of the front lens group is insufficient, which is not conducive to achieving the wide-angle of the optical system.

[0016] In one embodiment, the optical system satisfies the following condition:

[0017] 0.9mm≤f≤1.0mm. When the above conditional expression is met, the effective focal length of the optical system can be made small enough, which is conducive to improving the field angle of the optical system and realizing the wide-angle of the optical system. At the same time, improving the field angle of the optical system is conducive to increasing the depth of field of the optical system, so as to enhance the perspective of the optical system, and further help improve the imaging quality of the optical system.

[0018] In one embodiment, the optical system satisfies the following condition:

[0019] 40≤SDs2 / |SAGs3|≤44.5;

[0020] Wherein, SDs2 is the maximum effective aperture of the object side of the second lens, and SAGs3 is the vector height at the maximum effective aperture of the object side of the second lens, that is, the distance from the center of the object side of the second lens to the maximum effective aperture of the object side of the second lens in the direction parallel to the optical axis, and that is, the distance from the maximum effective aperture of the object side of the second lens to the intersection of the object side of the second lens and the optical axis in the direction parallel to the optical axis, wherein, in the direction parallel to the optical axis, when the maximum effective aperture of the object side of the second lens is located on the image side of the intersection of the object side of the second lens and the optical axis, SAGs3 is a positive value, and in the direction parallel to the optical axis, when the maximum effective aperture of the object side of the second lens is located on the object side of the intersection of the object side of the second lens and the optical axis, SAGs3 is a negative value. When the lower limit of the above conditional expression is met, the object side of the second lens can be prevented from being too curved, thereby reducing the processing difficulty of the second lens and avoiding the problem of uneven coating due to the excessive curvature of the object side of the second lens, thereby preventing the problem of ghosting. At the same time, preventing the object side profile of the second lens from being too curved is also conducive to large-angle light incident on the optical system, thereby improving the imaging quality of the optical system. When the upper limit of the above conditional expression is met, the object side profile of the second lens can be prevented from being too flat, reducing the risk of ghosting.

[0021] In one embodiment, the optical system satisfies the following condition:

[0022] 2.4≤2*f*tan(HFOV / 2)≤2.511;

[0023] Wherein, f is the effective focal length of the optical system, in mm, and HFOV is half of the maximum field of view of the optical system, in degrees. Under ideal conditions, the image height of the optical system is equal to 2*f*tan(HFOV / 2). When the above conditional formula is met, the effective focal length and the maximum field of view of the optical system can be reasonably configured, which is conducive to expanding the shooting range of the optical system while ensuring that the optical system has high pixels.

[0024] In one embodiment, the fourth lens is cemented with the fifth lens, and the optical system satisfies the following conditional formula:

[0025] -8≤(CT5-CT4)*(α5-α4)≤-1.25;

[0026] Wherein, CT4 is the thickness of the fourth lens on the optical axis, that is, the center thickness of the fourth lens, in mm, CT5 is the thickness of the fifth lens on the optical axis, in mm, and α4 is the thermal expansion coefficient of the fourth lens under -30°C-70°C conditions, in 10-6 / ℃, α5 is the thermal expansion coefficient of the fifth lens under -30℃-70℃ condition, unit is 10 -6 / ℃. When the above conditional formula is met, the center thickness of the fourth lens and the fifth lens and the materials of the fourth lens and the fifth lens can be reasonably configured to reduce the influence of temperature on the optical system, thereby enabling the optical system to have good imaging quality under high or low temperature conditions. At the same time, the center thickness difference and material property difference between the fourth lens and the fifth lens can be reduced, thereby reducing the risk of cracking of the cemented lens composed of the fourth lens and the fifth lens.

[0027] In one embodiment, the image side surface of the fifth lens is aspherical, and the optical system satisfies the following conditional formula:

[0028] 31.6≤Rs10 / f5≤46.5;

[0029] Wherein, Rs10 is the curvature radius of the image side surface of the fifth lens at the optical axis, and f5 is the effective focal length of the fifth lens. The image side surface of the fifth lens is an aspherical surface, which can reduce the sensitivity of the optical system, help correct the aberration of the optical system, and thus improve the imaging quality of the optical system. When the above conditional formula is met, the curvature radius of the image side surface of the fifth lens can be reasonably configured, which is conducive to improving the ghost problem.

[0030] In one embodiment, the optical system satisfies the following condition:

[0031] 13≤TTL / f≤14;

[0032] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, that is, the total system length of the optical system. When the above conditional formula is met, the total system length and the effective focal length of the optical system can be reasonably configured, so that while meeting the large field angle range of the optical system, the total optical length of the optical system can be limited to meet the miniaturization design of the optical system. If the upper limit of the above relationship is exceeded, the total system length of the optical system is too long, which is not conducive to realizing the miniaturization design of the optical system. If the lower limit is lower than the lower limit of the above conditional formula, the effective focal length of the optical system is too long, which is not conducive to expanding the field angle of the optical system, so that the optical system cannot obtain sufficient object space information.

[0033] In one embodiment, the optical system satisfies the following condition:

[0034] 100deg / mm≤HFOV / f≤110deg / mm;

[0035] Among them, HFOV is half of the maximum field of view angle in the diagonal direction of the optical system. When the above conditional expression is met, the field of view angle and effective focal length of the optical system can be reasonably configured, so that the optical system has the characteristics of a large field of view angle, thereby effectively improving the image framing range of the optical system. At the same time, the effective focal length of the optical system is not too small, so that the optical system can accommodate a large framing range while also being able to clearly image distant objects, thereby improving the optical system's ability to capture low-frequency details, and thus being able to meet the requirements of high-quality shooting. When it exceeds the upper limit of the above relationship or is lower than the lower limit of the above relationship, it is difficult to balance the large framing range and high imaging quality of the optical system, and cannot meet the use requirements well.

[0036] An imaging module comprises a photosensitive element and the optical system described in any one of the above embodiments, wherein the photosensitive element is arranged on the image side of the optical system. The above optical system is used in the imaging module to achieve a wide angle of the imaging module and improve the image plane brightness of the imaging module with a large angle field of view.

[0037] An electronic device comprises a housing and the above-mentioned imaging module, wherein the imaging module is arranged in the housing. The use of the above-mentioned imaging module in the electronic device is conducive to the wide-angle range and high-quality shooting of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of an optical system in a first embodiment of the present application;

[0039] Figure 2 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the first embodiment of the present application;

[0040] Figure 3 is a schematic diagram of an optical system in a second embodiment of the present application;

[0041] Figure 4 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the second embodiment of the present application;

[0042] Figure 5 is a schematic diagram of an optical system in a third embodiment of the present application;

[0043] Figure 6 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the third embodiment of the present application;

[0044] Figure 7 is a schematic diagram of an optical system in a fourth embodiment of the present application;

[0045] Figure 8The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fourth embodiment of the present application;

[0046] Fig. 9 is a schematic diagram of an optical system in a fifth embodiment of the present application;

[0047] Fig.10 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fifth embodiment of the present application;

[0048] Fig.11 is a schematic diagram of an imaging module in an embodiment of the present application;

[0049] Fig.12 is a schematic diagram of an electronic device in an embodiment of the present application;

[0050] Fig.13 It is a schematic diagram of a car in one embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0057] See also Figure 1 In some embodiments of the present application, the optical system 100 includes, from the object side to the image side, 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. Specifically, the first lens L1 includes an object-side surface S1 and an image-side surface S2, the second lens L2 includes an object-side surface S3 and an image-side surface S4, the third lens L3 includes an object-side surface S5 and an image-side surface S6, the fourth lens L4 includes an object-side surface S7 and an image-side surface S8, the fifth lens L5 includes an object-side surface S9 and an image-side surface S10, and the sixth lens L6 includes an object-side surface S11 and an image-side surface S12.

[0058] The first lens L1 has negative refractive power, and the object side surface S1 of the first lens L1 is convex at the near optical axis 110, and the image side surface S2 is concave at the near optical axis 110. The second lens L2 has negative refractive power, and the object side surface S3 of the second lens is concave at the near optical axis 110. The third lens L3 has positive refractive power, and the object side surface S5 of the third lens L3 is convex at the near optical axis 110, and the image side surface S6 is convex at the near optical axis 110. The fourth lens L4 has positive refractive power, and the object side surface S7 of the fourth lens L4 is convex at the near optical axis 110, and the image side surface S8 is convex at the near optical axis 110. The fifth lens L5 has negative refractive power, and the image side surface S10 of the fifth lens L5 is convex at the near optical axis 110, and the object side surface S9 and the image side surface S10 of the fifth lens L5 are both aspherical surfaces. The sixth lens L6 has positive refractive power.

[0059] In addition, in some embodiments, the optical system 100 is provided with a stop STO, which can be provided between the third lens L3 and the fourth lens L4. In some embodiments, the optical system 100 further includes a filter L7 provided on the image side of the sixth lens L6, and the filter L7 includes an object side surface S13 and an image side surface S14. Further, the optical system 100 further includes an image plane S17 located on the image side of the sixth lens L6, and the image plane S17 is the imaging surface of the optical system 100. The incident light can be imaged on the image plane S17 after being adjusted by the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6. It is worth noting that the filter L6 can be an infrared cutoff filter for filtering out interference light and preventing interference light from reaching the image plane S17 of the optical system 100 and affecting normal imaging. In some embodiments, the optical system may further include a protective glass L8 provided on the image side of the sixth lens L6, and the protective glass L8 is used to protect the image plane S17 of the optical system 100.

[0060] In some embodiments, the object side and image side of each lens of the optical system 100 are both aspherical surfaces. The use of aspherical structures can improve the flexibility of lens design, and effectively correct spherical aberration and improve imaging quality. In other embodiments, the object side and image side of each lens of the optical system 100 may also be spherical surfaces. It should be noted that the above embodiments are only examples of some embodiments of the present application. In some embodiments, the surface of each lens in the optical system 100 may be any combination of aspherical surfaces or spherical surfaces. Furthermore, in some embodiments, the object side and image side of at least one lens in the optical system 100 are aspherical surfaces, which is beneficial to correct the aberration of the optical system 100 and improve the imaging quality of the optical system 100.

[0061] In some embodiments, the material of each lens in the optical system 100 can be glass or plastic. The use of plastic lenses can reduce the weight of the optical system 100 and reduce production costs. The use of glass lenses enables the optical system 100 to have excellent optical performance and high temperature resistance. It should be noted that the material of each lens in the optical system 100 can also be any combination of glass and plastic, and does not necessarily have to be glass or plastic.

[0062] It should be noted that the first lens L1 does not mean that there is only one lens. In some embodiments, there may be two or more lenses in the first lens L1. The two or more lenses can form a cemented lens. The surface of the cemented lens closest to the object side can be regarded as the object side surface S1, and the surface closest to the image side can be regarded as the image side surface S2. Alternatively, the lenses in the first lens L1 do not form a cemented lens, but the distances between the lenses are relatively fixed. In this case, the object side surface of the lens closest to the object side is the object side surface S1, and the image side surface of the lens closest to the image side is the image side surface S2. In addition, in some embodiments, the number of lenses in the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, or the sixth lens L6 may be greater than or equal to two, and any adjacent lenses may form a cemented lens or a non-cemented lens.

[0063] Furthermore, in some embodiments, the optical system 100 satisfies the conditional formula: -11≤f123 / f≤-9; wherein f123 is the combined focal length of the first lens L1, the second lens L2 and the third lens L3, and f is the effective focal length of the optical system 100. Specifically, f123 / f may be: -10.902, -10.852, -10.639, -10.527, -10.203, -10.025, -9.998, -9.756, -9.534 or -9.269. When the above relationship is satisfied, the front lens group composed of the first lens L1, the second lens L2 and the third lens L3 provides negative refractive power for the optical system 100, which is conducive to the large-angle light beam passing through and entering the stop STO of the optical system 100, so as to realize the wide-angle of the optical system 100 and improve the image brightness of the large-angle field of view of the optical system 100. If the value exceeds the upper limit of the above conditional expression, the refractive power of the front lens group is too strong, which may cause serious astigmatism in the large-angle edge field of view of the optical system 100, thereby reducing the edge resolution capability. If the value is lower than the lower limit of the above conditional expression, the refractive power of the front lens group is insufficient, which is not conducive to achieving a wide-angle optical system 100.

[0064] In some embodiments, the optical system 100 satisfies the conditional formula: 0.9mm≤f≤1.0mm. Specifically, f can be: 0.960, 0.961, 0.962, 0.963, 0.964, 0.965, 0.966, 0.967, 0.968 or 0.97, and the unit of the value is mm. When the above conditional formula is met, the effective focal length of the optical system 100 can be made small enough, which is conducive to improving the field angle of the optical system 100 and realizing the wide angle of the optical system 100. In addition, improving the field angle of the optical system 100 is conducive to increasing the depth of field of the optical system 100, so as to enhance the perspective of the optical system 100, and further help improve the imaging quality of the optical system 100.

[0065] In some embodiments, the optical system 100 satisfies the conditional expression: 40≤SDs2 / |SAGs3|≤44.5; wherein SDs2 is the maximum effective aperture of the object side surface S3 of the second lens L2, and SAGs3 is the sag height at the maximum effective aperture of the object side surface S3 of the second lens L2. Specifically, SDs2 / |SAGs3| may be: 40.779, 40.956, 41.028, 41.532, 41.678, 41.992, 42.510, 43.057, 43.128 or 44.125. When the lower limit of the above conditional expression is satisfied, the object side surface S3 of the second lens L2 can be prevented from being too curved, thereby reducing the difficulty of processing the second lens L2, and avoiding the problem of uneven coating due to the excessive curvature of the object side surface S3 of the second lens L2, thereby preventing the problem of ghosting. At the same time, preventing the object-side surface S3 of the second lens L2 from being too curved is also beneficial for large-angle light to be incident on the optical system 100, thereby improving the imaging quality of the optical system 100. When the upper limit of the above conditional expression is met, the object-side surface S3 of the second lens L2 can be prevented from being too flat, reducing the risk of generating ghost images.

[0066] In some embodiments, the optical system 100 satisfies the conditional formula: 2.4≤2*f*tan(HFOV / 2)≤2.511; wherein f is the effective focal length of the optical system 100, in mm, and HFOV is half of the maximum field of view of the optical system 100, in degrees. Specifically, 2*f*tan(HFOV / 2) can be: 2.435, 2.438, 2.439, 2.50, 2.53, 2.56, 2.57, 2.58, 2.59 or 2.460. Under ideal conditions, the image height of the optical system 100 is equal to 2*f*tan(HFOV / 2). When the above conditional formula is met, the effective focal length and the maximum field of view of the optical system 100 can be reasonably configured, which is conducive to expanding the shooting range of the optical system 100 while ensuring that the optical system 100 has high pixels.

[0067] In some embodiments, the optical system 100 satisfies the conditional formula: OPT-Dist≤65; wherein OPT-Dist is the distortion of the optical system 100. Specifically, OPT-Dist may be: 62.233, 62.308, 62.438, 62.657, 62.883, 62.901, 63.228, 63.369, 63.552 or 63.997. When the above conditional formula is satisfied, the distortion of the optical system 100 can be controlled to avoid excessive distortion of the optical system 100, thereby improving the imaging quality of the optical system 100 and achieving high image quality.

[0068] In some embodiments, the fourth lens L4 is cemented with the fifth lens L5, and the optical system 100 satisfies the condition: -8≤(CT5-CT4)*(α5-α4)≤-1.25; wherein CT4 is the thickness of the fourth lens L4 on the optical axis 110, that is, the central thickness of the fourth lens L4, in mm, CT5 is the thickness of the fifth lens L5 on the optical axis 110, in mm, and α4 is the thermal expansion coefficient of the fourth lens L4 under the condition of -30°C-70°C, in 10 -6 / ℃, α5 is the thermal expansion coefficient of the fifth lens L5 at -30℃-70℃, unit is 10 -6 / ℃. Specifically, (CT5-CT4)*(α5-α4) can be: -7.976, -7.856, -7.023, -6.556, -6.213, -5.332, -4.397, -3.962, -1.765 or -1.298. When the above conditional formula is met, the center thickness of the fourth lens L4 and the fifth lens L5 and the materials of the fourth lens L4 and the fifth lens L5 can be reasonably configured to reduce the influence of temperature on the optical system 100, so that the optical system 100 can have good imaging quality under high or low temperature conditions. At the same time, the difference in center thickness and material properties between the fourth lens L4 and the fifth lens L5 can be reduced, thereby reducing the risk of cracking of the cemented lens composed of the fourth lens L4 and the fifth lens L5.

[0069] In some embodiments, the image side surface S10 of the fifth lens L5 is an aspherical surface, and the optical system 100 satisfies the conditional formula: 31.6≤Rs10 / f5≤46.5; wherein Rs10 is the radius of curvature of the image side surface S10 of the fifth lens L5 at the optical axis 110, and f5 is the effective focal length of the fifth lens L5. Specifically, Rs10 / f5 can be: 31.680, 32.527, 33.647, 34.214, 36.852, 37.621, 38.024, 40.225, 42.367 or 46.333. The image side surface S10 of the fifth lens L5 is an aspherical surface, which can reduce the sensitivity of the optical system 100, is conducive to correcting the aberration of the optical system 100, and thus improves the imaging quality of the optical system 100. When the above conditional formula is met, the radius of curvature of the image side surface of the fifth lens L5 can be reasonably configured, which is conducive to improving the ghost problem.

[0070] In some embodiments, the optical system 100 satisfies the conditional formula: 13≤TTL / f≤14; wherein TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface of the optical system 100 on the optical axis 110, that is, the total system length of the optical system 100. Specifically, TTL / f can be: 13.713, 13.728, 13.736, 13.756, 13.762, 13.789, 13.805, 13.826, 13.833 or 13.885. When the above conditional formula is satisfied, the total system length and effective focal length of the optical system 100 can be reasonably configured, so that while satisfying the large field angle range of the optical system 100, the total optical length of the optical system 100 can be limited to meet the miniaturized design of the optical system 100. If the upper limit of the above relationship is exceeded, the total system length of the optical system 100 is too long, which is not conducive to realizing the miniaturized design of the optical system 100. If the value is lower than the lower limit of the above conditional expression, the effective focal length of the optical system 100 is too long, which is not conducive to expanding the field angle of the optical system 100 and makes it impossible for the optical system 100 to obtain sufficient object space information.

[0071] In some embodiments, the optical system 100 satisfies the condition: 100 deg / mm≤HFOV / f≤110 deg / mm, wherein HFOV is half of the maximum field angle in the diagonal direction of the optical system 100. Specifically, HFOV / f may be: 106.701, 106.855, 106.932, 107.052, 107.133, 107.264, 107.445, 107.732, 107.793 or 107.813, and the numerical unit is deg / mm. When the above conditional expression is met, the field of view angle and effective focal length of the optical system 100 can be reasonably configured, so that the optical system 100 has the characteristics of a large field of view angle, thereby effectively improving the image framing range of the optical system 100. At the same time, the effective focal length of the optical system 100 is not too small, so that the optical system 100 can accommodate a large framing range while also being able to clearly image distant objects, thereby improving the optical system 100's ability to capture low-frequency details, and thus being able to meet the requirements of high-quality shooting. When the upper limit of the above relationship is exceeded or the lower limit of the above relationship is lower than, it is difficult for the optical system 100 to have both a large framing range and high imaging quality, and cannot meet the use requirements well.

[0072] Based on the description of the above embodiments, more specific embodiments and drawings are presented below for detailed description.

[0073] First embodiment

[0074] See also Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the optical system 100 in the first embodiment. The optical system 100 includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, an aperture STO, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power. Figure 2 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the first embodiment, wherein the reference wavelength of the astigmatism graph and the distortion graph is 538 nm, which is the same as in other embodiments.

[0075] The object-side surface S1 of the first lens L1 is convex at the near optical axis 110;

[0076] The image-side surface S2 of the first lens L1 is concave at the near optical axis 110;

[0077] The object-side surface S3 of the second lens L2 is concave at the near optical axis 110;

[0078] The image-side surface S4 of the second lens L2 is concave at the near optical axis 110;

[0079] The object-side surface S5 of the third lens L3 is convex near the optical axis 110;

[0080] The image-side surface S6 of the third lens L3 is convex at the near optical axis 110;

[0081] The object-side surface S7 of the fourth lens L4 is convex at the near optical axis 110;

[0082] The image-side surface S8 of the fourth lens L4 is convex at the near optical axis 110;

[0083] The object-side surface S9 of the fifth lens L5 is concave at the near optical axis 110;

[0084] The image-side surface S10 of the fifth lens L5 is convex at the near optical axis 110;

[0085] The object-side surface S11 of the sixth lens L6 is convex at the near optical axis 110;

[0086] The image-side surface S12 of the sixth lens L6 is convex near the optical axis 110 .

[0087] The object-side surface and the image-side surface of the first lens L1 and the third lens L3 are both spherical surfaces, and the object-side surface and the image-side surface of the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all aspherical surfaces.

[0088] The first lens L1 and the third lens L3 are made of glass, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are made of plastic.

[0089] Furthermore, the optical system 100 satisfies the conditional formula: f123 / f=-10.902; wherein f123 is the combined focal length of the first lens L1, the second lens L2 and the third lens L3, and f is the effective focal length of the optical system 100. When the above relationship is satisfied, the front lens group composed of the first lens L1, the second lens L2 and the third lens L3 provides negative refractive power for the optical system 100, which is beneficial for large-angle light beams to pass through and enter the stop STO of the optical system 100, so as to achieve the wide-angle of the optical system 100 and improve the image brightness of the large-angle field of view of the optical system 100. The refractive power of the front lens group will not be too strong, so as to avoid the situation where the refractive power of the front lens group is too strong, resulting in serious astigmatism in the large-angle edge field of view of the optical system 100 and reducing the edge resolution ability. The refractive power of the front lens group will not be insufficient, which is beneficial to achieve the wide-angle of the optical system 100.

[0090] The optical system 100 satisfies the conditional expression: f=0.97 mm. When the above conditional expression is satisfied, the effective focal length of the optical system 100 can be sufficiently small, which is conducive to improving the field angle of the optical system 100 and realizing the wide angle of the optical system 100. In addition, improving the field angle of the optical system 100 is conducive to increasing the depth of field of the optical system 100, so as to enhance the perspective of the optical system 100, and further to improve the imaging quality of the optical system 100.

[0091] The optical system 100 satisfies the conditional formula: SDs2 / |SAGs3|=43.851; wherein SDs2 is the maximum effective aperture of the object side surface S3 of the second lens L2, and SAGs3 is the vector height at the maximum effective aperture of the object side surface S3 of the second lens L2. When the above conditional formula is satisfied, it is possible to avoid the object side surface S3 of the second lens L2 from being too curved, thereby reducing the difficulty of processing the second lens L2, and avoiding the problem of uneven coating caused by the object side surface S3 of the second lens L2 being too curved, thereby avoiding the problem of ghosting. At the same time, avoiding the object side surface S3 of the second lens L2 from being too curved is also conducive to large-angle light incident on the optical system 100, thereby improving the imaging quality of the optical system 100. In addition, it is also possible to avoid the object side surface S3 of the second lens L2 from being too flat, thereby reducing the risk of ghosting.

[0092] The optical system 100 satisfies the conditional formula: 2*f*tan(HFOV / 2)=2.460; wherein f is the effective focal length of the optical system 100, in mm, and HFOV is half of the maximum field angle of the optical system 100, in degrees. Under ideal conditions, the image height of the optical system 100 is equal to 2*f*tan(HFOV / 2). When the above conditional formula is satisfied, the effective focal length and the maximum field angle of the optical system 100 can be reasonably configured, which is beneficial to expanding the shooting range of the optical system 100 while ensuring that the optical system 100 has high pixels.

[0093] The optical system 100 satisfies the conditional expression: OPT-Dist=62.233, wherein OPT-Dist is the distortion of the optical system 100. When the above conditional expression is satisfied, the distortion amount of the optical system 100 can be controlled to avoid excessive distortion of the optical system 100, thereby improving the imaging quality of the optical system 100 and achieving high image quality.

[0094] The fourth lens L4 and the fifth lens L5 are cemented together, and the optical system 100 satisfies the conditional formula: (CT5-CT4)*(α5-α4)=-7.427; wherein CT4 is the thickness of the fourth lens L4 on the optical axis 110, that is, the center thickness of the fourth lens L4, in mm, CT5 is the thickness of the fifth lens L5 on the optical axis 110, in mm, and α4 is the thermal expansion coefficient of the fourth lens L4 under the condition of -30°C-70°C, in 10 -6 / ℃, α5 is the thermal expansion coefficient of the fifth lens L5 at -30℃-70℃, unit is 10 -6 / ℃. When the above conditional formula is met, the center thickness of the fourth lens L4 and the fifth lens L5 and the materials of the fourth lens L4 and the fifth lens L5 can be reasonably configured to reduce the influence of temperature on the optical system 100, so that the optical system 100 can have good imaging quality under high or low temperature conditions. At the same time, the center thickness difference and material property difference between the fourth lens L4 and the fifth lens L5 can be reduced, thereby reducing the risk of cracking of the cemented lens composed of the fourth lens L4 and the fifth lens L5.

[0095] The image side surface S10 of the fifth lens L5 is an aspherical surface, and the optical system 100 satisfies the conditional formula: Rs10 / f5=44.902; wherein Rs10 is the radius of curvature of the image side surface S10 of the fifth lens L5 at the optical axis 110, and f5 is the effective focal length of the fifth lens L5. The image side surface S10 of the fifth lens L5 is an aspherical surface, which can reduce the sensitivity of the optical system 100, is conducive to correcting the aberration of the optical system 100, and further improves the imaging quality of the optical system 100. When the above conditional formula is met, the radius of curvature of the image side surface of the fifth lens L5 can be reasonably configured, which is conducive to improving the ghost problem.

[0096] The optical system 100 satisfies the conditional formula: TTL / f=13.713; wherein TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface of the optical system 100 on the optical axis 110, that is, the total system length of the optical system 100. When the above conditional formula is satisfied, the total system length and the effective focal length of the optical system 100 can be reasonably configured, so that while satisfying the large field angle range of the optical system 100, the total optical length of the optical system 100 can be limited to satisfy the miniaturization design of the optical system 100. The effective focal length of the optical system 100 will not be too long, which is conducive to expanding the field angle of the optical system 100 and enabling the optical system 100 to obtain sufficient object space information.

[0097] The optical system 100 satisfies the conditional formula: HFOV / f=106.701deg / mm; wherein HFOV is half of the maximum field of view angle in the diagonal direction of the optical system 100. When the above conditional formula is satisfied, the field of view angle and the effective focal length of the optical system 100 can be reasonably configured, so that the optical system 100 has the characteristics of a large field of view angle, thereby effectively improving the image framing range of the optical system 100. At the same time, the effective focal length of the optical system 100 is not too small, so that the optical system 100 can accommodate a large framing range while also being able to clearly image distant objects, thereby improving the optical system 100's ability to capture low-frequency details, and thus being able to meet the requirements of high-quality shooting. When the upper limit of the above relationship is exceeded or the lower limit of the above relationship is lower than, it is difficult to take into account both the large framing range and the high imaging quality of the optical system 100, and cannot meet the use requirements well.

[0098] In addition, various parameters of the optical system 100 are given in Table 1. Among them, the image plane S17 in Table 1 can be understood as the imaging plane of the optical system 100. The elements from the object plane (not shown) to the image plane S17 are arranged in the order of the elements from top to bottom in Table 1. The Y radius in Table 1 is the radius of curvature of the object side or image side of the corresponding surface number at the optical axis 110. Surface number 1 and surface number 2 are the object side surface S1 and image side surface S2 of the first lens L1, respectively, that is, in the same lens, the surface with a smaller surface number is the object side surface, and the surface with a larger surface number is the image side surface. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens on the optical axis 110, and the second value is the distance from the image side surface of the lens to the object side surface of the next lens in the image side direction on the optical axis 110.

[0099] It should be noted that, in this embodiment and the following embodiments, the optical system 100 may not be provided with the infrared filter L7, but in this case the distance from the image side surface S12 to the image surface S17 of the sixth lens L6 remains unchanged.

[0100] In the first embodiment, the total effective focal length f of the optical system 100 is 0.97 mm, the aperture number FNO is 2.05, and the maximum field of view FOV is 207°. In each embodiment of the present application, the field of view FOV of the optical system 100 in the diagonal direction is greater than 200°, and the optical system has the characteristic of a large field of view.

[0101] The reference wavelength of the focal length of each lens is 538 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.56 nm, which is the same for other embodiments.

[0102] Table 1

[0103]

[0104] Further, the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 2. Among them, the surface numbers from 1 to 12 represent the image side or object side S1 to S12 respectively. And K-A20 from top to bottom represent the types of aspheric coefficients respectively, among which K represents the cone coefficient, A4 represents the fourth-order aspheric coefficient, A6 represents the sixth-order aspheric coefficient, A8 represents the eighth-order aspheric coefficient, and so on. In addition, the formula of the aspheric coefficient is as follows:

[0105]

[0106] Among them, Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspherical surface to the optical axis 110, c is the curvature of the aspherical vertex, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula.

[0107] Table 2

[0108] Surface number 3 4 7 9 K -9.900E+01 -8.274E-01 5.826E+00 2.444E-01 A4 -6.901E-03 -2.402E-02 -7.099E-02 -3.208E-01 A6 4.259E-03 1.200E-01 5.994E-01 2.292E+00 A8 -1.905E-03 -2.817E-01 -3.789E+00 -1.684E+01 A10 6.160E-04 4.031E-01 1.394E+01 7.527E+01 A12 -1.505E-04 -3.558E-01 -3.186E+01 -2.039E+02 A14 2.634E-05 1.949E-01 4.545E+01 3.359E+02 A16 -3.021E-06 -6.471E-02 -3.935E+01 -3.291E+02 A18 1.996E-07 1.193E-02 1.885E+01 1.762E+02 A20 -5.700E-09 -9.364E-04 -3.827E+00 -3.969E+01 Surface number 10 11 12 K -7.507E+03 -9.993E+00 1.218E+00 A4 -6.628E-02 -6.864E-02 1.930E-02 A6 7.613E-02 -2.385E-03 -3.523E-02 A8 -8.034E-03 1.799E-01 6.364E-02 A10 7.704E-03 -3.190E-01 -6.009E-02 A12 -2.038E-01 2.693E-01 4.871E-02 A14 3.803E-01 -1.192E-01 -3.482E-02 A16 -3.044E-01 2.417E-02 1.801E-02 A18 1.168E-01 -7.267E-04 -5.322E-03 A20 -1.758E-02 -2.630E-04 6.569E-04

[0109] in addition, Figure 2 The optical system 100 includes a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), which indicates the deviation of the convergence focus of light of different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration diagram indicates the normalized pupil coordinate (Normalized Pupil Coordinator) from the center of the pupil to the edge of the pupil, and the abscissa indicates the distance (in mm) from the imaging plane to the intersection of the light and the optical axis 110. It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergence focus of light of each wavelength in the first embodiment tends to be consistent, and the diffuse spots or color halos in the imaging picture are effectively suppressed. Figure 2 Also included are field curvature diagrams (ASTIGMATIC FIELD CURVES) of the optical system 100, where the S curve represents the sagittal field curvature at 538 nm, and the T curve represents the meridian field curvature at 538 nm. As can be seen from the figure, the field curvature of the system is small, the field curvature and astigmatism of each field of view are well corrected, and the center and edge of the field of view have clear imaging. Figure 2 The optical system 100 also includes a distortion diagram (DISTORTION). It can be seen from the diagram that the image deformation caused by the main light beam is small and the imaging quality of the system is excellent.

[0110] Second embodiment

[0111] See also Figure 3 and Figure 4 , Figure 3is a schematic diagram of the optical system 100 in the second embodiment. The optical system 100 includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, an aperture STO, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power. Figure 4 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the second embodiment.

[0112] The object-side surface S1 of the first lens L1 is convex at the near optical axis 110;

[0113] The image-side surface S2 of the first lens L1 is concave at the near optical axis 110;

[0114] The object-side surface S3 of the second lens L2 is concave at the near optical axis 110;

[0115] The image-side surface S4 of the second lens L2 is concave at the near optical axis 110;

[0116] The object-side surface S5 of the third lens L3 is convex near the optical axis 110;

[0117] The image-side surface S6 of the third lens L3 is convex at the near optical axis 110;

[0118] The object-side surface S7 of the fourth lens L4 is convex at the near optical axis 110;

[0119] The image-side surface S8 of the fourth lens L4 is convex at the near optical axis 110;

[0120] The object-side surface S9 of the fifth lens L5 is concave at the near optical axis 110;

[0121] The image-side surface S10 of the fifth lens L5 is convex at the near optical axis 110;

[0122] The object-side surface S11 of the sixth lens L6 is convex at the near optical axis 110;

[0123] The image-side surface S12 of the sixth lens L6 is convex near the optical axis 110 .

[0124] The object-side surface and the image-side surface of the first lens L1 and the third lens L3 are both spherical surfaces, and the object-side surface and the image-side surface of the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all aspherical surfaces.

[0125] The first lens L1 and the third lens L3 are made of glass, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are made of plastic.

[0126] In addition, various parameters of the optical system 100 are given in Table 3, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

[0127] Table 3

[0128]

[0129] Furthermore, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in Table 4, and the definition of each parameter therein can be obtained from the first embodiment, which will not be elaborated here.

[0130] Table 4

[0131] Surface number 3 4 7 9 K -9.900E+01 -8.317E-01 6.277E+00 1.805E-01 A4 -7.592E-03 -1.646E-02 -7.170E-02 -2.046E-01 A6 5.100E-03 8.016E-02 5.540E-01 1.559E+00 A8 -2.183E-03 -1.926E-01 -3.521E+00 -1.334E+01 A10 5.998E-04 2.887E-01 1.310E+01 6.244E+01 A12 -1.163E-04 -2.649E-01 -3.068E+01 -1.689E+02 A14 1.649E-05 1.489E-01 4.523E+01 2.727E+02 A16 -1.648E-06 -5.022E-02 -4.090E+01 -2.595E+02 A18 1.020E-07 9.328E-03 2.075E+01 1.345E+02 A20 -2.859E-09 -7.332E-04 -4.547E+00 -2.929E+01 Surface number 10 11 12 K -9.863E+01 -1.017E+01 1.198E+00 A4 -7.419E-02 -7.939E-02 3.202E-02 A6 1.816E-01 1.065E-01 -9.260E-02 A8 -5.328E-01 -2.005E-01 2.398E-01 A10 1.352E+00 3.970E-01 -3.791E-01 A12 -2.227E+00 -5.327E-01 4.029E-01 A14 2.237E+00 4.264E-01 -2.791E-01 A16 -1.330E+00 -1.964E-01 1.196E-01 A18 4.305E-01 4.792E-02 -2.863E-02 A20 -5.858E-02 -4.764E-03 2.920E-03

[0132] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0133] f123 / f -9.269 OPT-Dist 63.906 f 0.960 (CT5-CT4)*(α5-α4) -7.727 SDs2 / |SAGs3| 43.871 Rs10 / f5 33.272 2*f*tan(HFOV / 2) 2.435 TTL / f 13.845 HFOV / f 107.813

[0134] In addition, by Figure 4 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.

[0135] Third embodiment

[0136] See also Figure 5 and Figure 6 , Figure 5 is a schematic diagram of the optical system 100 in the third embodiment. The optical system 100 includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, an aperture STO, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power. Figure 6 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the third embodiment.

[0137] The object-side surface S1 of the first lens L1 is convex at the near optical axis 110;

[0138] The image-side surface S2 of the first lens L1 is concave at the near optical axis 110;

[0139] The object-side surface S3 of the second lens L2 is concave at the near optical axis 110;

[0140] The image-side surface S4 of the second lens L2 is concave at the near optical axis 110;

[0141] The object-side surface S5 of the third lens L3 is convex near the optical axis 110;

[0142] The image-side surface S6 of the third lens L3 is convex at the near optical axis 110;

[0143] The object-side surface S7 of the fourth lens L4 is convex at the near optical axis 110;

[0144] The image-side surface S8 of the fourth lens L4 is convex at the near optical axis 110;

[0145] The object-side surface S9 of the fifth lens L5 is concave at the near optical axis 110;

[0146] The image-side surface S10 of the fifth lens L5 is convex at the near optical axis 110;

[0147] The object-side surface S11 of the sixth lens L6 is convex at the near optical axis 110;

[0148] The image-side surface S12 of the sixth lens L6 is convex near the optical axis 110 .

[0149] The object-side surface and the image-side surface of the first lens L1 and the third lens L3 are both spherical surfaces, and the object-side surface and the image-side surface of the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all aspherical surfaces.

[0150] The first lens L1 and the third lens L3 are made of glass, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are made of plastic.

[0151] In addition, various parameters of the optical system 100 are given in Table 5, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

[0152] Table 5

[0153]

[0154] Furthermore, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in Table 6, and the definition of each parameter therein can be obtained from the first embodiment, which will not be repeated here.

[0155] Table 6

[0156]

[0157]

[0158] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0159] f123 / f -9.363 OPT-Dist 63.997 f 0.960 (CT5-CT4)*(α5-α4) -1.298 SDs2 / |SAGs3| 43.579 Rs10 / f5 31.680 2*f*tan(HFOV / 2) 2.435 TTL / f 13.835 HFOV / f 107.813

[0160] In addition, by Figure 6As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.

[0161] Fourth embodiment

[0162] See also Figure 7 and Figure 8 , Figure 7 is a schematic diagram of an optical system 100 in a fourth embodiment. The optical system 100 includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, an aperture STO, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power. Figure 8 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the fourth embodiment.

[0163] The object-side surface S1 of the first lens L1 is convex at the near optical axis 110;

[0164] The image-side surface S2 of the first lens L1 is concave at the near optical axis 110;

[0165] The object-side surface S3 of the second lens L2 is concave at the near optical axis 110;

[0166] The image-side surface S4 of the second lens L2 is concave at the near optical axis 110;

[0167] The object-side surface S5 of the third lens L3 is convex near the optical axis 110;

[0168] The image-side surface S6 of the third lens L3 is convex at the near optical axis 110;

[0169] The object-side surface S7 of the fourth lens L4 is convex at the near optical axis 110;

[0170] The image-side surface S8 of the fourth lens L4 is convex at the near optical axis 110;

[0171] The object-side surface S9 of the fifth lens L5 is concave at the near optical axis 110;

[0172] The image-side surface S10 of the fifth lens L5 is convex at the near optical axis 110;

[0173] The object-side surface S11 of the sixth lens L6 is convex at the near optical axis 110;

[0174] The image-side surface S12 of the sixth lens L6 is convex near the optical axis 110 .

[0175] The object-side surface and the image-side surface of the first lens L1 and the third lens L3 are both spherical surfaces, and the object-side surface and the image-side surface of the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all aspherical surfaces.

[0176] The first lens L1 and the third lens L3 are made of glass, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are made of plastic.

[0177] In addition, various parameters of the optical system 100 are given in Table 7, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

[0178] Table 7

[0179]

[0180] Furthermore, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in Table 8, and the definition of each parameter therein can be obtained from the first embodiment, which will not be repeated here.

[0181] Table 8

[0182]

[0183]

[0184] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0185] f123 / f -9.895 OPT-Dist 62.298 f 0.970 (CT5-CT4)*(α5-α4) -1.329 SDs2 / |SAGs3| 40.779 Rs10 / f5 46.161 2*f*tan(HFOV / 2) 2.460 TTL / f 13.753 HFOV / f 106.701

[0186] In addition, by Figure 8 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.

[0187] Fifth embodiment

[0188] See also Fig. 9 and Fig.10 , Fig. 9 is a schematic diagram of the optical system 100 in the fifth embodiment. The optical system 100 includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, an aperture STO, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power. Fig.10 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the fifth embodiment.

[0189] The object-side surface S1 of the first lens L1 is convex at the near optical axis 110;

[0190] The image-side surface S2 of the first lens L1 is concave at the near optical axis 110;

[0191] The object-side surface S3 of the second lens L2 is concave at the near optical axis 110;

[0192] The image-side surface S4 of the second lens L2 is concave at the near optical axis 110;

[0193] The object-side surface S5 of the third lens L3 is convex near the optical axis 110;

[0194] The image-side surface S6 of the third lens L3 is convex at the near optical axis 110;

[0195] The object-side surface S7 of the fourth lens L4 is convex at the near optical axis 110;

[0196] The image-side surface S8 of the fourth lens L4 is convex at the near optical axis 110;

[0197] The object-side surface S9 of the fifth lens L5 is concave at the near optical axis 110;

[0198] The image-side surface S10 of the fifth lens L5 is convex at the near optical axis 110;

[0199] The object-side surface S11 of the sixth lens L6 is convex at the near optical axis 110;

[0200] The image-side surface S12 of the sixth lens L6 is convex near the optical axis 110 .

[0201] The object-side surface and the image-side surface of the first lens L1 and the third lens L3 are both spherical surfaces, and the object-side surface and the image-side surface of the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all aspherical surfaces.

[0202] The first lens L1 and the third lens L3 are made of glass, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are made of plastic.

[0203] In addition, various parameters of the optical system 100 are given in Table 9, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

[0204] Table 9

[0205]

[0206]

[0207] Furthermore, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in Table 10, and the definition of each parameter therein can be obtained from the first embodiment, which will not be repeated here.

[0208] Table 10

[0209] Surface number 3 4 7 9 K -1.377E+01 -8.452E-01 6.564E+00 1.095E-01 A4 -7.841E-03 -3.344E-02 -2.945E-02 -3.344E-01 A6 4.446E-03 1.317E-01 2.489E-02 1.610E+00 A8 -7.642E-04 -3.024E-01 -1.618E-01 -7.881E+00 A10 -4.177E-04 5.074E-01 2.257E-01 2.349E+01 A12 2.561E-04 -4.087E-01 -2.498E-01 -4.863E+01 A14 -6.222E-05 2.301E-01 1.172E+00 6.454E+01 A16 8.113E-06 -7.767E-02 -3.325E+00 -5.064E+01 A18 -5.593E-07 1.444E-02 3.736E+00 2.082E+01 A20 1.606E-08 -1.136E-03 -1.485E+00 -3.322E+00 Surface number 10 11 12 K 6.190E+01 -1.020E+01 1.198E+00 A4 -5.949E-02 -5.837E-02 2.636E-02 A6 7.269E-02 -8.339E-03 -6.376E-02 A8 1.257E-02 1.425E-01 1.697E-01 A10 -8.258E-02 -2.382E-01 -2.905E-01 A12 1.252E-02 2.044E-01 3.401E-01 A14 1.069E-01 -1.149E-01 -2.562E-01 A16 -9.991E-02 4.890E-02 1.172E-01 A18 3.493E-02 -1.446E-02 -2.943E-02 A20 -4.239E-03 2.018E-03 3.110E-03

[0210] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0211]

[0212]

[0213] In addition, by Fig.10 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.

[0214] See also Fig.11 In some embodiments, the optical system 100 can be assembled with the photosensitive element 210 to form the imaging module 200. At this time, the photosensitive surface of the photosensitive element 210 can be regarded as the image plane S17 of the optical system 100. The imaging module 200 can also be provided with a filter L7, and the filter L7 is arranged between the image side surface S12 of the sixth lens L6 and the image plane S17. The imaging module 200 can also be provided with a protective glass L8, and the protective glass L8 is located between the filter L7 and the image plane S17 to protect the photosensitive element 210. Specifically, the photosensitive element 210 can be a charge coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS Sensor). The use of the above optical system 100 in the imaging module 200 can realize the wide-angle of the imaging module 200, and at the same time improve the image plane brightness of the large-angle field of view of the imaging module 200.

[0215] See also Fig.11 and Fig.12 In some embodiments, the imaging module 200 can be used in an electronic device 300, and the electronic device includes a housing 310, and the imaging module 200 is disposed in the housing 310. Specifically, the electronic device 300 can be, but is not limited to, a portable phone, a video phone, a smart phone, an e-book reader, a driving recorder, or other vehicle-mounted imaging devices or a wearable device such as a smart watch. Using the imaging module 200 in the electronic device 300 is conducive to the wide angle range and high image quality shooting of the electronic device 300.

[0216] See also Fig.11 and Fig.13 In some embodiments, the electronic device 300 can be used in a car 400, and the car 400 includes a fixing part 410, and the electronic device 300 is fixed to the fixing part 410. In this embodiment, the electronic device 300 can be a driving recorder, a car camera, etc., and the fixing part 410 can be a frame of the car 400, or a component connecting the electronic device 300 to the frame of the car 400. Using the above electronic device 300 in the car 400 is conducive to the wide angle range and high image quality shooting of the car 400, and thus is conducive to improving driving safety.

[0217] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0218] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical system, characterized in that: From the object side to the image side, it includes: A first lens having negative refractive power, wherein the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis; A second lens having negative refractive power, wherein the object side surface of the second lens is concave at the near optical axis, and the image side surface of the second lens is concave at the near optical axis; a third lens having positive refractive power, wherein the object side surface of the third lens is convex at the near optical axis, and the image side surface of the third lens is convex at the near optical axis; Aperture; a fourth lens having positive refractive power, wherein the object-side surface of the fourth lens is convex at the near optical axis, and the image-side surface of the fourth lens is convex at the near optical axis; a fifth lens having negative refractive power, wherein the object side surface of the fifth lens is concave at the near optical axis, the image side surface of the fifth lens is convex at the near optical axis, and both the object side surface and the image side surface of the fifth lens are aspherical surfaces; a sixth lens having positive refractive power, wherein the object-side surface of the sixth lens is convex at the near optical axis, and the image-side surface of the sixth lens is convex at the near optical axis; And the optical system satisfies the following conditional formula: -11≤f123 / f≤-9, 13≤TTL / f≤14; Wherein, f123 is the combined focal length of the first lens, the second lens and the third lens, f is the effective focal length of the optical system, and TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis.

2. The optical system according to claim 1, characterized in that The following conditions are met: 0.9mm≤f≤1.0mm.

3. The optical system according to claim 1, characterized in that The following conditions are met: 40≤SDs2 / |SAGs3|≤44.5; Among them, SDs2 is the maximum effective light-clearing aperture on the object side of the second lens, and SAGs3 is the vector height at the maximum effective light-clearing aperture on the object side of the second lens.

4. The optical system according to claim 1, characterized in that The following conditions are met: 2.4≤2*f*tan(HFOV / 2)≤2.511mm; Wherein, HFOV is half of the maximum field of view of the optical system, in degrees.

5. The optical system according to claim 1, characterized in that The fourth lens is cemented with the fifth lens, and the optical system satisfies the following conditional formula: -8 mm* / ℃≤(CT5-CT4)*(α5-α4) ≤-1.25mm*10 -6 / ℃; Wherein, CT4 is the thickness of the fourth lens on the optical axis, in mm, CT5 is the thickness of the fifth lens on the optical axis, in mm, and α4 is the thermal expansion coefficient of the fourth lens under -30°C-70°C conditions, in 10 -6 / ℃, α5 is the thermal expansion coefficient of the fifth lens under -30℃-70℃ condition, unit is 10 -6 / ℃.

6. The optical system according to claim 1, characterized in that The image side surface of the fifth lens is aspherical, and the optical system satisfies the following conditional formula: 31.6≤Rs10 / f5≤46.5; Wherein, Rs10 is the curvature radius of the image side surface of the fifth lens at the optical axis, and f5 is the effective focal length of the fifth lens.

7. The optical system according to claim 1, characterized in that The following conditions are met: 13.713≤TTL / f≤13.

885.

8. The optical system according to claim 1, characterized in that The following conditions are met: 100deg / mm≤HFOV / f≤110deg / mm; Wherein, HFOV is half of the maximum field of view angle of the optical system in the diagonal direction.

9. An imaging module, characterized in that: The optical system comprises a photosensitive element and any one of claims 1 to 8, wherein the photosensitive element is arranged on the image side of the optical system.

10. An electronic device, characterized in that: It comprises a shell and the imaging module as claimed in claim 9, wherein the imaging module is arranged in the shell.

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