CN113376809A

CN113376809A - Optical lens, camera module, electronic equipment and automobile

Info

Publication number: CN113376809A
Application number: CN202110718114.XA
Authority: CN
Inventors: 乐宇明; 蔡雄宇; 周芮; 赵迪
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2021-09-10
Anticipated expiration: 2041-06-28
Also published as: CN113376809B

Abstract

The application discloses optical lens, make a video recording module, electronic equipment and car, optical lens include along optical axis from the thing side to the first lens that the picture side set gradually, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, the first lens has negative refractive power, the second lens has positive refractive power, the third lens has negative refractive power, the fourth lens has refractive power, the fifth lens has refractive power, the sixth lens has positive refractive power, the seventh lens has refractive power, optical lens satisfies following relation: 1< CT7/| Sags | < 15. According to the optical lens, the camera module, the electronic device and the automobile provided by the embodiment of the invention, when the lens has the refractive power and the surface design and meets the relation of |1< CT7/| Sags | <15, the production difficulty and the production cost of the lens can be reduced while realizing the miniaturization design and high-quality imaging.

Description

Optical lens, camera module, electronic equipment and automobile

Technical Field

The invention relates to the technical field of optical imaging, in particular to an optical lens, a camera module, electronic equipment and an automobile.

Background

With the development of the vehicle-mounted industry, the technical requirements of automobile driving auxiliary cameras such as forward-looking cameras, side-looking cameras, automatic cruising cameras, automobile data recorders and automobile backing images are higher and higher. Especially look sideways at the camera, look sideways at the camera and regard as the on-vehicle camera that is used for monitoring the highway condition of car left and right sides, can make the driver can be very audio-visual discernment and control barrier, pedestrian in the blind area of car left and right sides in the car goes. The vehicle-mounted camera not only needs to realize miniaturization design and high-quality imaging, but also reduces the production difficulty and the production cost of the lens of the vehicle-mounted camera, and is a problem which needs to be solved urgently at present.

Disclosure of Invention

The invention discloses an optical lens, a camera module, electronic equipment and an automobile, which can reduce the production difficulty and the production cost of the lens while realizing miniaturization design and high-quality imaging.

In order to achieve the above object, in a first aspect, the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in order from an object side to an image side along an optical axis;

the first lens element with negative refractive power has a concave image-side surface at paraxial region;

the second lens element with positive refractive power has a convex image-side surface at paraxial region;

the third lens element with negative refractive power has a concave object-side surface at paraxial region;

the fourth lens element with refractive power;

the fifth lens element with refractive power;

the sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface at paraxial region;

the seventh lens element with refractive power;

the optical lens satisfies the following relationship:

1<CT7/|Sags|<15；

wherein CT7 is the thickness of the seventh lens on the optical axis (i.e., the central thickness of the seventh lens), and Sags is the distance parallel to the optical axis from the maximum clear aperture on the image side of the seventh lens to the center point of the effective optical area of the seventh lens (i.e., the sagittal height at the maximum clear aperture on the image side of the seventh lens).

In this application, have negative refractive power through setting up first lens element, and the image side of first lens element is the concave surface to can be favorable to grabbing the light that the large-angle penetrated into optical lens, thereby the width of increase pencil of rays, and then can increase optical lens's angle of vision scope. Meanwhile, the second lens element provides positive refractive power for the optical lens, and the image side surface of the second lens element is convex, so that light rays can be converged, and edge aberration can be corrected, thereby improving the imaging resolution of the optical lens. The third lens provides negative refractive power for the optical lens, and can bear the width enlarging capacity of the first lens on the ray bundle, so that the width of the ray bundle formed by the refraction of the large-angle rays through the first lens and the second lens is increased. In addition, the sixth lens element provides positive refractive power for the optical lens, and the object-side surface and the image-side surface of the sixth lens element are both convex surfaces, so that light can be effectively converged, the trend of a light path can be controlled, further, peripheral aberration can be favorably corrected, and the imaging quality of the optical lens can be improved.

Further, the optical lens is limited to satisfy the relation 1< CT7/| Sags | <15, so that the relation of the ratio of the central thickness of the seventh lens to the rise of the image side of the seventh lens is controlled, the situation that the manufacturing difficulty of the seventh lens is increased due to the fact that the central thickness of the seventh lens is too large or the image side of the seventh lens is too curved is avoided, and the production cost of the optical lens is reduced. When the lower limit of the relational expression is exceeded, the image side surface of the seventh lens is too curved, so that the processing difficulty of the seventh lens is increased, and the production cost of the lens is increased; meanwhile, the surface of the seventh lens element is too curved, which is prone to generate edge aberration, and is not favorable for improving the image quality of the optical lens. If the upper limit of the relational expression is exceeded, the center thickness of the seventh lens is too large, which is disadvantageous in weight reduction and size reduction of the optical lens.

As an alternative implementation, in an embodiment of the first aspect of the present invention, at least two lenses of the first to seventh lenses are cemented. At least two lenses are arranged in the first lens to the seventh lens for gluing, so that the total length of the optical lens can be effectively shortened, and the optical lens meets the requirement of miniaturization design.

Optionally, in the first lens element to the seventh lens element, the image-side surface of the second lens element is cemented with the object-side surface of the third lens element, and the image-side surface of the fourth lens element is cemented with the object-side surface of the fifth lens element, in other words, the first lens element to the seventh lens element have four cemented lens elements, which can further shorten the total length of the optical lens, and at the same time, can effectively correct aberrations of the front lens group (i.e., the first lens element to the third lens element), which is beneficial to improving the imaging quality of the optical lens.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens further satisfies the following relation: 1.5< f23/f < 11;

wherein f23 is a combined focal length of the second lens and the third lens, and f is an effective focal length of the optical lens. By controlling the relationship between the combined focal length of the second lens and the third lens and the effective focal length of the optical lens, the control of the convergence of the light rays of the front lens group (namely the first lens to the third lens) of the optical lens is facilitated, the control of the incidence of the light rays with the large-angle field of view into the optical lens is facilitated, and the wide angle of the optical lens is ensured. In addition, the aberration is mutually corrected in the front lens group (the first lens to the third lens) of the optical lens, the resolving power of the optical lens is improved, and the optical lens can obtain higher imaging quality.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1< f47/f < 2; where f47 is a combined focal length of the fourth, fifth, sixth, and seventh lenses, and f is an effective focal length of the optical lens. By reasonably controlling the ratio of the combined focal length of the fourth lens, the fifth lens, the sixth lens and the seventh lens to the effective focal length of the optical lens, on one hand, the optical lens is beneficial to controlling the angle of the incident light of the light beam which is emitted out of the optical lens so as to reduce the aberration generated by the optical lens and reduce the outer diameters of the fourth lens to the seventh lens; on the other hand, the influence of curvature of field generated by the front lens group (namely the first lens to the third lens) on the resolving power can be corrected, and the imaging quality of the optical lens can be effectively ensured.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -7< f3/f < -2; where f3 is the focal length of the third lens, and f is the effective focal length of the optical lens. The third lens provides negative refractive power for the optical lens, so that the width of a light ray bundle is favorably enlarged, the angle of light rays which are shot after large-angle light rays are refracted by the first lens and the second lens is increased, and pupils are full of the light rays, so that the light rays can be fully transmitted to an imaging surface, a wider field range is obtained, and high-pixel imaging of the optical lens is favorably realized; if the aberration is not corrected, the imaging quality of the optical lens may be degraded.

Optionally, in the first to seventh lenses, an abbe number of at least one lens satisfies a relation: vd < 30. Therefore, the chromatic aberration can be better corrected by the optical lens, and the imaging quality of the optical lens is improved.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: EPL/DOS is more than 1.5 and less than 2;

wherein, EPL is a distance from the diaphragm to an image plane of the optical lens on the optical axis, and DOS is a distance from an object side surface of the first lens to the diaphragm on the optical axis. By satisfying the above relational expression, the structure of the optical lens is more compact, thereby realizing the miniaturization design of the optical lens. Meanwhile, when the relation is satisfied, when the optical lens is applied to the camera module, light can be incident on the photosensitive element of the camera module in a mode close to vertical incidence, so that the optical lens has telecentric characteristics, and the improvement of the photosensitive sensitivity of the photosensitive element of the camera module is facilitated. When the lower limit of the above relation is exceeded, the large-angle light may be difficult to be incident on the optical lens, which reduces the object space imaging range of the optical lens and is not favorable for expanding the imaging angle of the optical lens.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 17.5deg/mm < FOV/EPD <20.5 deg/mm;

wherein FOV is a maximum field angle of the optical lens and EPD is an entrance pupil diameter of the optical lens. The ratio of the maximum field angle and the entrance pupil diameter of the optical lens is controlled, so that the optical lens has a larger field angle range, and a large aperture effect and a far field depth range of the optical lens can be embodied, namely the optical lens can realize infinite and large-angle clear imaging, and still has clear recognition capability on nearby scenes, and the imaging quality is high.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 2 < (D12+ CT2)/(CT3+ D34) < 3;

wherein D12 is an air gap between the first lens element and the second lens element on the optical axis, CT2 is a thickness of the second lens element on the optical axis, CT3 is a thickness of the third lens element on the optical axis, and D34 is an air gap between the third lens element and the fourth lens element on the optical axis. Through the limitation of the relational expression, the aberration of the optical lens is favorably corrected, the imaging resolution of the optical lens is improved, and meanwhile, the optical lens can be ensured to have the effect of compact structure so as to meet the requirement of miniaturization design. When the range of the relationship is exceeded, the aberration of the optical lens is not corrected, and the imaging quality of the optical lens is reduced. In addition, the provision of an excessively large air gap and a lens thickness increases the overall length burden of the optical lens, which is disadvantageous for the compact design of the optical lens.

In a second aspect, the present invention discloses a camera module, which includes a photosensitive element and the optical lens of the first aspect, wherein the photosensitive element is disposed at an image side of the optical lens. The camera module with the optical lens meets the requirement of miniaturization design, has high imaging quality and can reduce the production cost of the optical lens.

In a third aspect, the present invention further discloses an electronic device, where the electronic device includes a device main body and the camera module according to the second aspect, and the camera module is disposed in the device main body. The electronic equipment with the camera module can meet the requirement of miniaturization design, has high imaging quality and can reduce the production cost of the optical lens.

In a fourth aspect, the invention further discloses an automobile, and the automobile comprises the camera module according to the second aspect.

Compared with the prior art, the invention has the beneficial effects that:

according to the optical lens, the camera module, the electronic device and the automobile, the first lens is arranged to have negative refractive power, and the image side surface of the first lens is the concave surface, so that light rays emitted into the optical lens at a large angle can be favorably grasped, the width of a light ray bundle is increased, and the field angle range of the optical lens can be further increased. Meanwhile, the second lens element provides positive refractive power for the optical lens, and the image side surface of the second lens element is convex, so that light rays can be converged, and edge aberration can be corrected, thereby improving the imaging resolution of the optical lens. The third lens provides negative refractive power for the optical lens, and can bear the width enlarging capacity of the first lens on the ray bundle, so that the width of the ray bundle formed by the refraction of the large-angle rays through the first lens and the second lens is increased. In addition, the sixth lens element provides positive refractive power for the optical lens, and the object-side surface and the image-side surface of the sixth lens element are both convex surfaces, so that light can be effectively converged, the trend of a light path can be controlled, further, peripheral aberration can be favorably corrected, and the imaging quality of the optical lens can be improved.

Further, the optical lens is limited to satisfy the relation 1< CT7/| Sags | <15, so that the relation of the ratio of the central thickness of the seventh lens to the rise of the image side of the seventh lens is controlled, the situation that the manufacturing difficulty of the seventh lens is increased due to the fact that the central thickness of the seventh lens is too large or the image side of the seventh lens is too curved is avoided, and the production cost of the optical lens is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an optical lens disclosed in a first embodiment of the present application;

fig. 2 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 3 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;

fig. 4 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 5 is a schematic structural diagram of an optical lens disclosed in the third embodiment of the present application;

fig. 6 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 7 is a schematic structural diagram of an optical lens disclosed in a fourth embodiment of the present application;

fig. 8 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 9 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;

fig. 10 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 11 is a schematic structural diagram of the camera module disclosed in the present application;

FIG. 12 is a schematic diagram of an electronic device disclosed herein;

fig. 13 is a schematic structural view of an automobile disclosed in the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.

The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.

Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7, which are disposed in order from an object side to an image side along an optical axis O. During imaging, light rays enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 in sequence from the object side of the first lens L1, and finally form an image on the image plane 101 of the optical lens 100.

Alternatively, the first lens element L1 has negative refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power or negative refractive power, the fifth lens element L5 has positive refractive power or negative refractive power, the sixth lens element L6 has positive refractive power, and the seventh lens element L7 has positive refractive power or negative refractive power.

Further, the object-side surface 11 of the first lens element L1 can be concave or convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 can be concave at the paraxial region O. The object-side surface 21 of the second lens element L2 can be concave or convex at the paraxial region O, and the image-side surface 22 can be convex at the paraxial region O. The object-side surface 31 of the third lens element L3 is concave at the paraxial region O, and the image-side surface 32 can be convex or concave at the paraxial region O. The object-side surface 41 of the fourth lens element L4 can be convex or concave at the paraxial region O, and the image-side surface 42 of the fourth lens element L4 can be concave or convex at the paraxial region O. The object-side surface 51 of the fifth lens element L5 can be concave or convex at the paraxial region O, and the image-side surface 52 of the fifth lens element L5 can be concave or convex at the paraxial region O. The object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex at the paraxial region O. The object-side surface 71 of the seventh lens element L7 can be concave or convex at the paraxial region O, and the image-side surface 72 of the seventh lens element L7 can be concave or convex at the paraxial region O.

The optical lens 100 adopts a seven-piece lens, and the first lens element L1 has negative refractive power, and the image side surface 12 of the first lens element L1 is concave, so that light rays incident into the optical lens 100 at a large angle can be favorably captured, the width of a light ray bundle is increased, and the field angle range of the optical lens 100 can be further increased. Meanwhile, the second lens element L2 is configured to provide positive refractive power to the optical lens 100, and the image-side surface 22 is convex, so as to help converge light and correct peripheral aberration, thereby improving the imaging resolution of the optical lens 100. The third lens element L3 provides negative refractive power for the optical lens 100, and can increase the width of the beam of light formed by the first lens element L1, so that the width of the beam of light formed by the refraction of the high-angle light rays through the first lens element L1 and the second lens element L2 is increased. In addition, the sixth lens element L6 provides positive refractive power for the optical lens 100, and the object-side surface 61 and the image-side surface 62 are both convex surfaces, so as to effectively converge light and control the direction of the light path, thereby facilitating the correction of peripheral aberration and improving the imaging quality of the optical lens 100.

In some embodiments, the object-side surface and the image-side surface of at least two of the first lens element L1 through the seventh lens element L7 are aspheric. The aspheric lens has the characteristics that: the curvature of the lens varies continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with constant curvature from the center of the lens to the periphery of the lens, the aspheric lens has better curvature radius characteristics and has the advantages of improving the distortion aberration and the astigmatic aberration, so that the problems of the aberration and the astigmatism of the optical lens can be effectively improved by adopting a mode that the object side surface and the image side surface of at least two lenses are aspheric. For example, the object-side surface and the image-side surface of the first lens element L1 through the fifth lens element L5 may be all spherical, and the object-side surface and the image-side surface of the sixth lens element L6 and the seventh lens element L7 may be aspheric, so that the aberration generated by the light rays incident on the sixth lens element L6 and the seventh lens element L7 is effectively improved, and the imaging quality of the optical lens 100 is improved. It is understood that, in other embodiments, of course, any two of the first lens L1 to the seventh lens L7 may be aspheric lenses, or any two of the first lens L1 to the fifth lens L5 may be aspheric lenses, and the remaining lenses may be spherical lenses.

In some embodiments, at least two of the first lens element L1 through the seventh lens element L7 may be plastic lenses. Specifically, as can be seen from the foregoing, at least two of the first lens element L1 to the seventh lens element L7 are aspheric lens elements, and therefore, the first lens element L1 to the seventh lens element L7 may be made of plastic so as to reduce the processing difficulty. For example, the sixth lens L6 and the seventh lens L7 are plastic lenses, and the first lens L1 to the fifth lens L5 are glass lenses. By using the plastic lens, the processing difficulty and the processing cost can be reduced, and the overall portability of the optical lens 100 is improved.

In some embodiments, at least two of the first lens L1 to the seventh lens L7 are cemented. In other words, at least two lenses of the first lens L1 to the seventh lens L7 are cemented together to form a cemented lens, so that the total length of the optical lens 100 can be shortened, and the optical lens 100 can meet the design requirement of miniaturization.

Alternatively, of the first lens L1 to the seventh lens L7, the image-side surface 22 of the second lens L2 is cemented with the object-side surface 31 of the third lens L3, and the image-side surface 42 of the fourth lens L4 is cemented with the object-side surface 51 of the fifth lens L5, in other words, of the first lens L1 to the seventh lens L7, four cemented lenses are provided, so that the total length of the optical lens 100 can be further shortened, and aberrations of the front lens group (i.e., the first lens L1 to the third lens L3) can be effectively corrected, thereby being beneficial to improving the imaging quality of the optical lens 100. Of course, it is also possible to provide only the second lens L2 and the third lens L3 to form a cemented lens, or to provide the fifth lens L5 and the sixth lens L6 to form a cemented lens, which may be provided according to the total length required by the optical lens 100, and this embodiment is not particularly limited thereto.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop 102 and/or a field stop 102, which may be disposed between the third lens L3 and the fourth lens L4. For example, the stop 102 may be disposed between the image-side surface 32 of the third lens L3 and the object-side surface 41 of the fourth lens L4. It is understood that, in other embodiments, the stop 102 may be disposed between other lenses or between the object side of the optical lens 100 and the object side 11 of the first lens L1, and the setting is adjusted according to practical situations, which is not limited in this embodiment.

Optionally, in order to improve the imaging quality, the optical lens 100 further includes an optical filter 80, and the optical filter 80 is disposed between the image-side surface 72 of the seventh lens L7 and the imaging surface 101 of the optical lens 100. Optionally, the optical filter 80 is an infrared optical filter, and by adopting the arrangement of the infrared optical filter 80, the infrared light passing through the seventh lens L7 can be effectively filtered, so that the imaging definition of the object on the image side is ensured, and the imaging quality is improved.

In some embodiments, in order to protect the optical lens 100, the optical lens 100 further includes a protective glass 90, and the protective glass 90 is disposed between the optical filter 80 and the image plane 101 of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1< CT7/| Sags | < 15; where CT7 is the thickness of the seventh lens L7 on the optical axis O, that is, the center thickness of the seventh lens L7, and Sags is the distance from the maximum clear aperture of the image-side surface 72 of the seventh lens L7 to the center point of the effective optical area of the seventh lens L7, that is, the rise of the image-side surface 72 of the seventh lens L7, parallel to the optical axis O. By controlling the ratio of the center thickness of the seventh lens L7 to the rise of the image-side surface 72 of the seventh lens L7, the situation that the manufacturing difficulty of the seventh lens L7 is increased due to the fact that the center thickness of the seventh lens L7 is too large or the image-side surface 72 of the seventh lens L7 is too curved is avoided, and therefore the reduction of the production cost of the optical lens is achieved. When the lower limit of the above relation is exceeded, the image-side surface 72 of the seventh lens L7 is too curved, which increases the difficulty of processing the seventh lens L7 and increases the production cost of the lens; meanwhile, the surface of the seventh lens element L7 is too curved, which is prone to generate edge aberration, and is not favorable for improving the image quality of the optical lens. If the upper limit of the relational expression is exceeded, the center thickness of the seventh lens L7 becomes too large, which is disadvantageous in weight reduction and size reduction of the optical lens.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.5< f23/f < 11; where f23 is the combined focal length of the second lens L2 and the third lens L3, and f is the effective focal length of the optical lens 100. By controlling the relationship between the combined focal length of the second lens L2 and the third lens L3 and the effective focal length of the optical lens 100, it is beneficial to control the convergence of the light rays of the front lens group (i.e. the first lens L1 to the third lens L3) of the optical lens 100, and to control the incidence of the light rays with a large angle field into the optical lens 100, so as to ensure the wide angle of the optical lens 100. In addition, it is also beneficial to mutually correct aberrations in the front lens group (the first lens L1 to the third lens L3) of the optical lens 100, and improve the resolving power of the optical lens 100, so that the optical lens 100 can obtain higher imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 1< f47/f < 2. Where f47 is a combined focal length of the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, and f is an effective focal length of the optical lens 100. By reasonably controlling the ratio of the combined focal length of the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 to the effective focal length of the optical lens, on one hand, the optical lens is beneficial to controlling the angle of the incident light rays of the light beams which exit the optical lens 100 so as to reduce the aberration generated by the optical lens 100, and the outer diameters of the fourth lens L4 to the seventh lens L7 can be reduced; on the other hand, the influence of curvature of field generated by the front lens group (i.e., the first lens L1 to the third lens L3) on the resolving power can be corrected, and the imaging quality of the optical lens 100 can be effectively ensured.

Further, the optical lens 100 can also satisfy the following relation: -7< f3/f < -2; where f3 is the focal length of the third lens L3, and f is the effective focal length of the optical lens 100. The third lens element L3 provides negative refractive power for the optical lens 100, which is beneficial to expanding the width of the light beam, so that the angle of the light rays which are incident after the light rays with large angles are refracted by the first lens element L1 and the second lens element L2 is increased, and the pupil is filled with the light rays, so that the light rays can be fully transmitted to the imaging surface 101, a wider field range is obtained, and high-pixel imaging of the optical lens 100 is facilitated; exceeding the above-mentioned range of the relational expression is disadvantageous in correcting the aberration of the optical lens 100, and the optical lens 100 may have a reduced image quality.

Optionally, in the first lens L1 to the seventh lens L7, an abbe number of at least one lens satisfies a relation Vd < 30, which is beneficial to the optical lens 100 to better correct chromatic aberration and improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: : EPL/DOS is more than 1.5 and less than 2; wherein, EPL is the distance between the stop 102 and the image plane 101 of the optical lens 100 on the optical axis O, and DOS is the distance between the object-side surface 11 of the first lens L1 and the stop 102 on the optical axis O. By satisfying the above relational expression, the structure of the optical lens 100 is facilitated to be more compact, thereby realizing a miniaturized design of the optical lens 100. Meanwhile, when the above relational expression is satisfied, when the optical lens 100 is applied to a camera module, light can be incident on a photosensitive element of the camera module in a manner close to vertical incidence, so that the optical lens 100 has telecentric characteristics, which is beneficial to improving the photosensitive sensitivity of the photosensitive element of the camera module. When the lower limit of the above relation is exceeded, the light with a large angle may be difficult to enter the optical lens 100, thereby reducing the object space imaging range of the optical lens 100 and being not favorable for expanding the imaging angle of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the relationship: 17.5deg/mm < FOV/EPD <20.5 deg/mm; where FOV is the maximum field angle of the optical lens 100 and EPD is the entrance pupil diameter of the optical lens 100. By controlling the ratio of the maximum field angle to the entrance pupil diameter of the optical lens 100, the optical lens 100 can have a large field angle range, and can also embody the large aperture effect and the far field depth range of the optical lens 100, that is, the optical lens 100 can still have clear recognition capability for nearby scenes while realizing infinite-distance and large-angle clear imaging, and the imaging quality is high.

In some embodiments, optical lens 100 satisfies the following relationship: 2 < (D12+ CT2)/(CT3+ D34) < 3; d12 is an air gap between the first lens L1 and the second lens L2 on the optical axis O, CT2 is a thickness of the second lens L2 on the optical axis O, CT3 is a thickness of the third lens L3 on the optical axis O, and D34 is an air gap between the third lens L3 and the fourth lens L4 on the optical axis O. Through the limitation of the above relation, it is beneficial to correct the aberration of the optical lens 100, and improve the imaging resolution of the optical lens 100, and meanwhile, it can be ensured that the optical lens 100 has an effect of compact structure to satisfy the miniaturization design. When the range of the relationship is exceeded, the aberration of the optical lens 100 is not corrected, and the imaging quality of the optical lens 100 is degraded. In addition, the provision of an excessively large air gap and a lens thickness increases the overall length burden of the optical lens 100, which is disadvantageous for the compact design of the optical lens 100.

The optical lens 100 of the present embodiment will be described in detail with reference to specific parameters.

First embodiment

A schematic structural diagram of an optical lens 100 disclosed in the first embodiment of the present application is shown in fig. 1, where the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a protective glass 90, which are sequentially disposed from an object side to an image side along an optical axis O. During imaging, light rays sequentially enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the protective glass 90 from the object side of the first lens L1, and finally form an image on the image plane 101 of the optical lens 100.

The refractive power distributions of the first lens element L1, the second lens element L2, the third lens element L3 and the sixth lens element L6 are as described above, wherein the fourth lens element L4 has negative refractive power, the fifth lens element L5 has positive refractive power, and the seventh lens element L7 has negative refractive power.

Furthermore, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are both concave at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are both convex at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are both concave at the paraxial region O, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are both concave at the paraxial region O, the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both convex at the paraxial region O, the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are both convex at the paraxial region O, the object-side surface 71 of the seventh lens element L7 is convex at the paraxial region O, and the image-side surface 72 of the seventh lens element L7 is concave at the paraxial region O.

In the first embodiment, the second lens L2, the third lens L3 form a cemented lens, and the fourth lens L4 and the fifth lens L5 form a cemented lens. In other words, in the first embodiment, the image-side surface 22 of the second lens L2 and the object-side surface 31 of the third lens L3 form a cemented surface, and the image-side surface 42 of the fourth lens L4 and the object-side surface 51 of the fifth lens L5 form a cemented surface.

Furthermore, the object-side surface and the image-side surface of the first lens element L1 through the fifth lens element L5 are all spherical, the object-side surface 71 and the image-side surface of the sixth lens element L6 and the seventh lens element L7 are all aspheric, the first lens element L1 through the fifth lens element L5 are glass lens elements, and the sixth lens element L6 and the seventh lens element L7 are plastic lens elements.

Further, when the object-side surface and the image-side surface of the sixth lens element L6 and the seventh lens element L7 are aspheric, the parameter formula of the aspheric surface can be determined by, but is not limited to, the following formula:

wherein X is the point on the aspheric surface which is Y away from the optical axis and the relative distance between the point and the tangent plane tangent to the intersection point on the aspheric surface optical axis; y is the perpendicular distance between the point on the aspheric curve and the optical axis, R is the curvature radius, k is the cone coefficient, and Ai is the aspheric coefficient of the ith order.

In the present embodiment, the focal length f of the optical lens 100 is 6.88mm, the field angle FOV of the optical lens 100 is 85.4deg, and the aperture size FNO is 1.62, for example, and other parameters of the optical lens 100 are given in table 1 below. The elements of the optical lens 100 from the object side to the image side along the optical axis O are arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the surface numbers 1 and 2 correspond to the object side surface 11 and the image side surface 12 of the first lens L1, respectively. The radius Y in table 1 is the radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis O. The first value in the "thickness" parameter column for the first lens element L1 is the thickness of the lens element on the optical axis O (center thickness), and the second value is the distance from the image-side surface to the back surface (lens object-side surface or stop surface) of the lens element on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O from the stop 102 to the vertex of the object-side surface of the subsequent lens (the vertex refers to the intersection point of the lens and the optical axis O), the direction from the object-side surface of the first lens L1 to the image-side surface of the last lens is defined as the positive direction of the optical axis O, when the value is negative, it indicates that the stop 102 is disposed on the right side of the vertex of the object-side surface of the subsequent lens, and if the thickness of the stop 102 is positive, the stop 102 is disposed on the left side of the vertex of the object-side surface of the subsequent lens. It is understood that the units of the radius Y and the thickness in table 1 are mm. The reference wavelength of the refractive index and Abbe number of each lens in Table 1 was 587.5612nm, and the reference wavelength of the focal length was 546.0740 nm. Table 2 is a table of parameters associated with the aspheric surfaces of the lenses of table 1, where k is the cone coefficient and Ai is the i-th order aspheric coefficient, e.g., a4 in table 2 represents the 4-th order aspheric coefficient, a6 represents the 6-th order aspheric coefficient, and so on.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at 432.00000nm, 479.9914nm, 546.0740nm, 587.5618nm and 656.2725 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 2 (B), fig. 2 (B) is a diagram of astigmatism of light of the optical lens 100 in the first embodiment at a wavelength of 546.0740 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 2 that the astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 2 (C), fig. 2 (C) is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 546.0740 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height in mm. As can be seen from (C) in fig. 2, the distortion of the optical lens 100 is corrected at a wavelength of 546.0740 nm.

Second embodiment

Referring to fig. 3, fig. 3 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a protective glass 90, which are disposed in this order from the object side to the image side along an optical axis O. During imaging, light rays sequentially enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the protective glass 90 from the object side of the first lens L1, and finally form an image on the image plane 101 of the optical lens 100.

For refractive power distribution, object-side surface and image-side surface of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7, reference is made to the above-mentioned embodiment, and no further description is given here.

In the second embodiment, the second lens L2, the third lens L3 form a cemented lens, and the fourth lens L4 and the fifth lens L5 form a cemented lens. In other words, in the second embodiment, the image-side surface 22 of the second lens L2 and the object-side surface 31 of the third lens L3 form a cemented surface, and the image-side surface 42 of the fourth lens L4 and the object-side surface 51 of the fifth lens L5 form a cemented surface.

Similarly, in the second embodiment, the object-side and image-side surfaces of the first lens element L1 through the fifth lens element L5 are all spherical, the object-side and image-side surfaces of the sixth lens element L6 and the seventh lens element L7 are all aspheric, the first lens element L1 through the fifth lens element L5 are glass lenses, and the sixth lens element L6 and the seventh lens element L7 are plastic lenses.

In the second embodiment, the focal length f of the optical lens 100 is 6.88mm, the field angle FOV of the optical lens 100 is 84.8deg, and the aperture size FNO is 1.62.

Other parameters in the second embodiment are shown in the following tables 3 and 4, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the reference wavelength of the refractive index, abbe number in table 3 is 587.5612nm, and the reference wavelength of the focal length is 546.0740 nm.

TABLE 3

TABLE 4

Further, please refer to fig. 4 (a), which shows a light spherical aberration curve chart of the optical lens 100 in the second embodiment at 432.00000nm, 479.9914nm, 546.0740nm, 587.5618nm, and 656.2725 nm. In fig. 4 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from (a) in fig. 4, the spherical aberration value of the optical lens 100 in the second embodiment is better, which illustrates that the imaging quality of the optical lens 100 in the present embodiment is better.

Referring to fig. 4 (B), fig. 4 (B) is a diagram of astigmatism of light of the optical lens 100 in the second embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and as can be seen from (B) in fig. 4, astigmatism of the optical lens 100 is well compensated.

Referring to fig. 4 (C), fig. 4 (C) is a distortion curve diagram of the optical lens 100 in the second embodiment at a wavelength of 546.0740 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from (C) in fig. 4, the distortion of the optical lens 100 is corrected at a wavelength of 546.0740 nm.

Third embodiment

Referring to fig. 5, fig. 5 is a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a protective glass 90, which are disposed in this order from the object side to the image side along an optical axis O. During imaging, light rays sequentially enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the protective glass 90 from the object side of the first lens L1, and finally form an image on the image plane 101 of the optical lens 100.

In the third embodiment, the refractive power distributions of the first lens element L1, the second lens element L2, the third lens element L3, the stop 102, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 refer to the above-mentioned second embodiment, where the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the paraxial region O, and the object-side surfaces and the image-side surfaces of the second lens element L2, the third lens element L3, the stop 102, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 are the same as those of the second embodiment, and thus no further description is given here.

In the third embodiment, the fourth lens L4 and the fifth lens L5 form a cemented lens, that is, the image-side surface 42 of the fourth lens L4 and the object-side surface 51 of the fifth lens L5 form a cemented surface.

In the third embodiment, the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 are all glass lenses, the third lens L3, the sixth lens L6, and the seventh lens L7 are plastic lenses, the object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 are all spherical surfaces, and the object-side surfaces and the image-side surfaces of the third lens L3, the sixth lens L6, and the seventh lens L7 are all aspheric surfaces.

In the third embodiment, the focal length f of the optical lens 100 is 6.69mm, the field angle FOV of the optical lens 100 is 75eg, and the aperture size FNO is 1.6.

Other parameters in the third embodiment are given in the following tables 5 and 6, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y and the thickness in table 5 are mm, and the reference wavelength of the refractive index and the abbe number of each lens in table 5 is 587.5612nm, and the reference wavelength of the focal length is 546.0740 nm.

TABLE 5

TABLE 6

Number of noodles

5

6

11

12

13

14

K

8.800E+01

-1.567E+01

-2.254E+00

-1.967E+00

-1.958E+00

-4.757E-01

A4

-2.338E-04

-3.810E-04

-1.370E-04

-2.008E-04

-9.713E-04

-1.016E-04

A6

7.496E-05

5.272E-05

-6.083E-05

-9.300E-06

4.031E-06

8.497E-06

A8

3.914E-06

3.322E-06

8.469E-08

-6.539E-09

2.528E-07

5.137E-07

A10

-3.858E-08

8.951E-07

-5.978E-09

2.347E-09

-1.427E-09

-9.219E-09

A12

-7.761E-09

-7.391E-08

-8.824E-11

-5.560E-11

-5.775E-11

-1.570E-09

A14

8.533E-11

4.227E-09

3.408E-12

-6.577E-12

4.329E-12

-1.568E-11

A16

1.945E-11

9.071E-11

-5.453E-14

1.085E-13

7.439E-14

4.122E-12

A18

0.000E+00

A20

0.000E+00

Further, please refer to fig. 6 (a), which shows a light spherical aberration curve diagram of the optical lens 100 in the third embodiment at 432.00000nm, 479.9914nm, 546.0740nm, 587.5618nm, and 656.2725 nm. In fig. 6 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from (a) in fig. 6, the spherical aberration value of the optical lens 100 in the third embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 6 (B), fig. 6 (B) is a diagram of astigmatism of light of the optical lens 100 in the third embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and as can be seen from (B) in fig. 6, astigmatism of the optical lens 100 is well compensated.

Referring to fig. 6 (C), fig. 6 (C) is a distortion curve diagram of the optical lens 100 in the third embodiment at a wavelength of 546.0740 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from (C) in fig. 6, the distortion of the optical lens 100 is corrected at a wavelength of 546.0740 nm.

Fourth embodiment

Fig. 7 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present disclosure. A first lens L1, a second lens L2, a third lens L3, a stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter 80, and a cover glass 90. During imaging, light rays sequentially enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the optical filter 80 and the protective glass 90 from the object side of the first lens L1, and finally form an image on the imaging surface 101 of the optical lens 100.

In the fourth embodiment, the first lens element L1 has negative refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, and the seventh lens element L7 has positive refractive power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively flat and convex at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively concave and convex at the paraxial region O, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are both convex at the paraxial region O, the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both concave at the paraxial region O, the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are both convex at the paraxial region O, and the object-side surface 71 and the image-side surface of the seventh lens element L7 are respectively concave and convex at the paraxial region O.

In the fourth embodiment, the fifth lens L5 and the sixth lens L6 form a cemented lens. That is, the image-side surface 52 of the fifth lens L5 and the object-side surface 61 of the sixth lens L6 form a cemented surface.

In the fourth embodiment, the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all glass lenses, the object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all spherical surfaces, the third lens L3 and the seventh lens L7 are all plastic lenses, and the object-side surfaces and the image-side surfaces of the third lens L3 and the seventh lens L7 are all aspheric surfaces.

In the fourth embodiment, the focal length f of the optical lens 100 is 6.74mm, the field angle FOV of the optical lens 100 is 77.7deg, and the aperture size FNO is 1.6.

Other parameters in the fourth embodiment are shown in the following table 7 and table 8, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y and the thickness in table 7 are mm. The reference wavelength for the refractive index and Abbe number of each lens in Table 7 was 587.5612nm, and the reference wavelength for the focal length was 546.0740 nm.

TABLE 7

TABLE 8

Number of noodles	5	6	13	14
					K	-2.084E+00	1.970E-01	-8.800E+01	-1.904E+01
A4	2.404E-04	1.428E-03	-9.381E-05	2.072E-04
					A6	6.431E-05	-5.300E-05	-3.561E-05	-4.463E-06
A8	-7.704E-06	-2.575E-06	3.460E-06	1.630E-06
					A10	7.705E-07	4.610E-07	-2.598E-07	-6.484E-08
A12	-4.199E-08	-3.924E-08	3.568E-09	4.263E-09
					A14	1.806E-09	8.206E-10	3.308E-10	-2.625E-10
A16	-2.625E-11	0.000E+00	-1.301E-11	4.316E-12
					A18	0.000E+00	0.000E+00	0.000E+00	0.000E+00
A20	0.000E+00	0.000E+00	0.000E+00	0.000E+00

Further, please refer to fig. 8 (a), which shows a light spherical aberration curve chart of the optical lens 100 in the fourth embodiment at 432.00000nm, 479.9914nm, 546.0740nm, 587.5618nm, and 656.2725 nm. In fig. 8 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from (a) in fig. 8, the spherical aberration value of the optical lens 100 in the fourth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 8 (B), fig. 8 (B) is a diagram of astigmatism of light of the optical lens 100 in the fourth embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and as can be seen from (B) in fig. 8, astigmatism of the optical lens 100 is well compensated.

Referring to fig. 8 (C), fig. 8 (C) is a distortion curve diagram of the optical lens 100 in the fourth embodiment at a wavelength of 546.0740 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from (C) in fig. 8, the distortion of the optical lens 100 is corrected at a wavelength of 546.0740 nm.

Fifth embodiment

Referring to fig. 9, fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application. A first lens L1, a second lens L2, a third lens L3, a stop 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter 80, and a cover glass 90. During imaging, light rays sequentially enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the optical filter 80 and the protective glass 90 from the object side of the first lens L1, and finally form an image on the imaging surface 101 of the optical lens 100.

In the fifth embodiment, the first lens element L1 has negative refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, and the seventh lens element L7 has positive refractive power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively concave and convex at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively concave and convex at the paraxial region O, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are both convex at the paraxial region O, the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both concave at the paraxial region O, the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are both convex at the paraxial region O, and the object-side surface 71 and the image-side surface of the seventh lens element L7 are respectively convex and concave at the paraxial region O.

In the fifth embodiment, the fifth lens L5 and the sixth lens L6 form a cemented lens. That is, the image-side surface 52 of the fifth lens L5 and the object-side surface 61 of the sixth lens L6 form a cemented surface.

In the fifth embodiment, the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all glass lenses, the object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all spherical surfaces, the third lens L3 and the seventh lens L7 are all plastic lenses, and the object-side surfaces and the image-side surfaces of the third lens L3 and the seventh lens L7 are all aspheric surfaces.

In the fifth embodiment, the focal length f of the optical lens 100 is 6.7mm, the field angle FOV of the optical lens 100 is 75.3deg, and the aperture size FNO is 1.6.

The other parameters in the fifth embodiment are shown in the following table 9 and table 10, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y and the thickness in table 9 are mm. The reference wavelength for the refractive index and Abbe number of each lens in Table 9 was 587.5612nm, and the reference wavelength for the focal length was 546.0740 nm.

TABLE 9

Watch 10

Further, please refer to fig. 10 (a), which shows a light spherical aberration curve chart of the optical lens 100 in the fourth embodiment at 432.00000nm, 479.9914nm, 546.0740nm, 587.5618nm, and 656.2725 nm. In fig. 10 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from (a) in fig. 10, the spherical aberration value of the optical lens 100 in the fourth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 10 (B), fig. 10 (B) is a diagram of astigmatism of light of the optical lens 100 in the fourth embodiment at a wavelength of 546.0740 nm. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and as can be seen from (B) in fig. 10, astigmatism of the optical lens 100 is well compensated.

Referring to fig. 10 (C), fig. 10 (C) is a distortion curve diagram of the optical lens 100 in the fourth embodiment at a wavelength of 546.0740 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from (C) in fig. 10, the distortion of the optical lens 100 is corrected at a wavelength of 546.0740 nm.

Referring to table 11, table 11 summarizes ratios of the relations in the first embodiment to the fifth embodiment of the present application.

TABLE 11

Referring to fig. 11, the present application further discloses a camera module 200, which includes a photosensitive element 201 and the optical lens 100 according to any of the first to fifth embodiments, wherein the photosensitive element 201 is disposed on an image side of the optical lens 100. The optical lens 100 is configured to receive a light signal of a subject and project the light signal to the light receiving element 201, and the light receiving element 201 is configured to convert the light signal corresponding to the subject into an image signal. And will not be described in detail herein. It can be understood that the camera module 200 having the optical lens 100 has all the technical effects of the optical lens 100, that is, the optical lens can satisfy the miniaturization design, and simultaneously, the difficulty of lens molding and assembling of the optical lens can be reduced, and the imaging quality of the optical lens 100 can be effectively improved. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

Referring to fig. 12, the present application further discloses an electronic device 300, wherein the electronic device 300 includes a device body 301 and the camera module 200, and the camera module 200 is disposed on the device body 301. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, and the like. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the optical lens 100 can satisfy the miniaturization design, and simultaneously, the difficulty of lens molding and assembling of the optical lens can be reduced, and the imaging quality of the optical lens 100 can be effectively improved. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

Referring to fig. 13, the present application further discloses an automobile 400, wherein the automobile 400 includes a mounting portion 410 and the camera module 200, and the camera module 200 is disposed on the mounting portion 410. When the camera module 200 is applied to the automobile 400, the camera module 200 can be used as an on-board camera, and the on-board camera can reduce the production difficulty and the production cost of the lens while realizing miniaturization design and high-quality imaging.

The optical lens, the camera module, the electronic device and the automobile disclosed by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the embodiment of the invention, and the description of the embodiment is only used for helping to understand the optical lens, the camera module, the electronic device and the automobile and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An optical lens, characterized in that: the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from an object side to an image side along an optical axis;

the fourth lens element with refractive power;

the fifth lens element with refractive power;

the seventh lens element with refractive power;

the optical lens satisfies the following relationship:

1<CT7/|Sags|<15；

wherein CT7 is the thickness of the seventh lens element on the optical axis, and Sags is the distance parallel to the optical axis from the maximum clear aperture on the image side of the seventh lens element to the center point of the effective optical area on the image side of the seventh lens element.

2. An optical lens according to claim 1, characterized in that: at least two lenses of the first lens to the seventh lens are cemented.

3. An optical lens according to claim 1, characterized in that: the optical lens further satisfies the following relation: 1.5< f23/f < 11;

wherein f23 is a combined focal length of the second lens and the third lens, and f is an effective focal length of the optical lens.

4. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation: 1< f47/f < 2;

where f47 is a combined focal length of the fourth, fifth, sixth, and seventh lenses, and f is an effective focal length of the optical lens.

5. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

-7<f3/f<-2；

where f3 is the focal length of the third lens, and f is the effective focal length of the optical lens.

6. An optical lens according to claim 1, characterized in that: the optical lens further comprises a diaphragm, and the optical lens satisfies the following relational expression:

1.5＜EPL/DOS＜2；

wherein, EPL is a distance from the diaphragm to an image plane of the optical lens on the optical axis, and DOS is a distance from an object side surface of the first lens to the diaphragm on the optical axis.

7. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

17.5deg/mm<FOV/EPD<20.5deg/mm；

wherein FOV is a maximum field angle of the optical lens and EPD is an entrance pupil diameter of the optical lens.

8. An optical lens according to claim 1, characterized in that: the optical lens satisfies the following relation:

2＜(D12+CT2)/(CT3+D34)<3；

wherein D12 is an air gap between the first lens element and the second lens element on the optical axis, CT2 is a thickness of the second lens element on the optical axis, CT3 is a thickness of the third lens element on the optical axis, and D34 is an air gap between the third lens element and the fourth lens element on the optical axis.

9. The utility model provides a module of making a video recording which characterized in that: the image capturing module comprises a photosensitive element and the optical lens of any one of claims 1 to 8, wherein the photosensitive element is disposed on an image side of the optical lens.

10. An electronic device, characterized in that: the electronic apparatus includes an apparatus main body and the camera module according to claim 9, the camera module being provided to the apparatus main body.

11. An automobile, characterized in that: the vehicle comprising a camera module according to claim 9.